NL2035366A - Noise mitigation system and method for mitigating underwater sound emissions from a source of sound - Google Patents
Noise mitigation system and method for mitigating underwater sound emissions from a source of sound Download PDFInfo
- Publication number
- NL2035366A NL2035366A NL2035366A NL2035366A NL2035366A NL 2035366 A NL2035366 A NL 2035366A NL 2035366 A NL2035366 A NL 2035366A NL 2035366 A NL2035366 A NL 2035366A NL 2035366 A NL2035366 A NL 2035366A
- Authority
- NL
- Netherlands
- Prior art keywords
- sound
- sections
- section
- noise mitigation
- dampening
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000000116 mitigating effect Effects 0.000 title abstract description 271
- 238000004804 winding Methods 0.000 claims abstract description 51
- 230000007246 mechanism Effects 0.000 claims abstract description 23
- 230000008878 coupling Effects 0.000 claims description 34
- 238000010168 coupling process Methods 0.000 claims description 34
- 238000005859 coupling reaction Methods 0.000 claims description 34
- 230000009467 reduction Effects 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 230000000630 rising effect Effects 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims 8
- 230000030279 gene silencing Effects 0.000 claims 5
- 238000007789 sealing Methods 0.000 claims 2
- 238000010276 construction Methods 0.000 description 6
- 230000008439 repair process Effects 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 5
- UQMRAFJOBWOFNS-UHFFFAOYSA-N butyl 2-(2,4-dichlorophenoxy)acetate Chemical compound CCCCOC(=O)COC1=CC=C(Cl)C=C1Cl UQMRAFJOBWOFNS-UHFFFAOYSA-N 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
- E02D13/005—Sound absorbing accessories in piling
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2200/00—Details of methods or devices for transmitting, conducting or directing sound in general
- G10K2200/11—Underwater, e.g. transducers for generating acoustic waves underwater
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Pipe Accessories (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
The invention relates to a noise mitigation system and a method for mitigating underwater sound emissions from a source of sound, wherein the noise mitigation system comprises a noise mitigation structure, a 5 carrier and a deployment mechanism for deploying the noise mitigation. structure in. a deployment direction. from. said carrier to extend in a circumferential direction around the source of sound, wherein the noise mitigation structure is divided into a plurality of noise mitigation sections which 10 are distributed ill the circumferential direction, wherein the deployment mechanism. comprises a plurality of collectors for winding up and stowing the plurality of noise Hutigation sections iJ1 a plurality (If windings and for unwinding said plurality of noise mitigation sections 15 from said plurality of windings.
Description
P142280NLO00
Noise mitigation system and method for mitigating underwater sound emissions from a source of sound
The invention relates to a noise mitigation system and a method for mitigating underwater sound emissions from a source of sound.
WO 2015/103581 Al discloses a known noise abatement apparatus for reduction of underwater sound emissions, such as noise from sea faring vessels, oil and mineral drilling operations, and marine construction and demolition. The noise abatement apparatus is mounted on an stowable frame that can pivot between a lowered horizontal position and a raised position. The noise abatement apparatus comprises blinds with a plurality of resonators in the form of inflatable pockets or compartments. Support lines can hoist the apparatus up and down relative to the stowable frame while lines allow the expansion and collapsing of the apparatus similar to a Venetian blind.
EP 2 937 466 Bl discloses another known device for mitigating underwater sound, comprising a buoyant hydraulic noise suppressor having damping elements distributed on a net. Prior to deployment, the noise suppressor is stowed away in a loosely draped or folded manner in an inverted box-shaped collecting device that is sunk to the seabed together with a transport housing. The transport housing is lowered in a controlled manner from a carrying device with the use of carrying cables, winches and drums. One end of the noise suppressor is connected to the transport housing and the other end to the collecting device. With the transport housing resting at the seabed, the collecting device is released and rises up as a result of the buoyancy of the noise suppressor, thereby simultaneously causing the noise suppressor to be pulled out of the collecting device into a spread out configuration surrounding a source of sound.
A disadvantage of the known noise abatement apparatus as disclosed in WO 2015/103581 Al is that the blinds, in their collapsed configuration, are still relatively bulky and heavy. In particular, when pivoting the stowable frame to the raised position, most of the weight of the collapsed blinds is located at one side of the stowable frame, thereby exerting relative high forces on the stowable frame and the vessel carrying said stowable frame. The stowable frame therefore needs to be relatively sturdy and, as a result, is very heavy. Moreover, the blinds are raised or lowered using a plurality of hoisting lines controlled by winches. The winches need to be carefully synchronized to avoid uneven load distributions and stress in the structure. Also, when one or more blinds require replacement, maintenance or repairs, the stowed frame needs to be pivoted to its lowered position and the noise abatement apparatus as a whole needs to be at least partially expanded to expose the faulty blinds.
A disadvantage of the known device for mitigating underwater sound as disclosed in EP 2 937 466 Bl is that the damping elements of the noise suppressor are likely to get entangled in the net during stowing or deployment.
Moreover, many of the critical deployment elements of the known device are located under water and are therefore difficult to access when maintenance or repairs are required.
It is an object of the present invention to provide a noise mitigation system and a method for mitigating underwater sound emissions from a source of sound, wherein the noise mitigation system can be more compact, is less likely to get entangled, has a better load distribution and/or is easier to maintain or repair.
According to a first aspect, the invention provides a noise mitigation system for mitigating underwater sound emissions from a source of sound, wherein the noise mitigation system comprises a noise mitigation structure, a carrier and a deployment mechanism for deploying the noise mitigation structure in a deployment direction from said carrier to extend in a circumferential direction around the source of sound, wherein the noise mitigation structure is divided into a plurality of noise mitigation sections which are distributed in the circumferential direction, wherein the deployment mechanism comprises a plurality of collectors for winding up and stowing the plurality of noise mitigation sections in a plurality of windings and for unwinding said plurality of noise mitigation sections from said plurality of windings.
The noise mitigation section can be unwound or unrolled from their respective collectors to progressively form or define the noise mitigation structure as it is being deployed. By stowing the plurality of noise mitigation sections in a plurality of windings on the collectors, the noise mitigation section can be stored in a controlled and uniform manner in which they are less likely to get entangled with themselves or each other. Moreover, the noise mitigation section can be unrolled in the same controlled and uniform manner to properly deploy the noise mitigation structure.
Fach noise mitigation section can be wound up or unrolled individually, thus allowing for relative movements and misalignments between the noise mitigation sections in the deployment direction without causing uneven load distribution or stresses in the noise mitigation structure.
In particular, there is no need to use complex control systems to synchronously wind-up or unwinding the noise mitigation sections.
The stowing of the plurality of noise mitigation sections in a plurality of windings on the respective collectors has an additional technical advantage in that the ‘package’ of windings on each collector is relatively compact and does not stick out in one particular direction.
Instead, the weight of the collectors with the noise mitigation sections stowed thereon can be kept relatively close to the carrier. Hence, the carrier does not need to be as sturdy or heavy and requires less powerful actuators to be pivoted between a lowered position and a raised position. Also, the compact ‘package’ of windings is less likely to be exposed to and/or affected by unpredictable external forces, such as waves, in the ‘splash zone’ at or near the water level.
Moreover, unlike the prior art, the noise mitigation sections, when stowed onto their respective collectors, are not interconnected. Therefore, they can be treated as independent units or modules. The number of modules can easily be adjusted or increased to scale the noise mitigation system for different applications. In particular, only the carrier needs to be modified to be able to carry a different number of modules, rather than the noise mitigation system as a whole. Also, the capacity of the collectors and therefore the length of the noise mitigation sections stored on the respective collectors can be easily increased while still keeping the deployment mechanism relatively compact, thereby allowing the noise mitigation structure to reach greater depths.
Finally, by stowing the noise mitigation sections in a plurality of windings on respective collectors, in case of maintenance, repairs or replacement, only the affected noise mitigation section can be partially or fully unwound from its respective collector, independently of the other noise mitigation sections and their respective collectors.
In one embodiment the plurality of collectors is distributed in the circumferential direction over the carrier. Hence, each collector can unwind the noise collection section stowed thereon in a respective position 5 along the circumference of the carrier, thereby allowing the plurality of noise mitigation sections, when deployed, to form the noise mitigation structure together.
In a further embodiment the plurality of noise mitigation sections has a deployment length in the deployment direction when fully unwound, wherein the plurality of collectors is configured for winding up the plurality of noise mitigation sections over at least seventy percent, preferably at least eighty percent and most preferably at least ninety percent of their deployment length. Hence, a considerable portion of the deployment length of the noise mitigation sections can be stowed on the respective collectors, leaving only a minimum portion of said deployment length unwound.
In a further embodiment each collector of the plurality of collectors is configured for winding and unwinding a single noise mitigation section of the plurality of noise mitigation sections. In other words, each noise mitigation section has its own dedicated collector.
Preferably, the each collector of the plurality of collectors comprises a reel that is rotatable about a reel axis transverse or perpendicular to the deployment direction, wherein each noise mitigation section is at least partially flexible in a winding direction about the reel axis of the respective collector. Hence, the noise mitigation section can be flexed or bend in several windings about the reel axis of the respective collector.
More preferably, each noise mitigation section comprises a support for supporting a plurality of sound dampening elements in a deployment plane when the respective noise mitigation section is unwound, wherein the support is flexible in the winding direction about the reel axis of the respective collector. Hence, the plurality of sound dampening elements do not necessarily have to be flexible about the reel axis, as long as the support is. In fact, the plurality of sound dampening elements may be rigid, for example in the shape of rigid beams, as detailed further below. Said beams may extend parallel or substantially parallel to the reel axis.
More preferably, each noise mitigation section comprises the plurality of sound dampening elements, wherein the plurality of sound dampening elements are spaced apart in the deployment direction over a spacing distance when the respective noise mitigation section is unwound, wherein the respective noise mitigation section is wound up on the respective collector in the plurality of windings along a spiral path with the same or substantially the same spacing distance between the plurality of sound dampening elements, considered along said spiral path.
Hence, unlike the Venetian blind system in the prior art, the noise mitigation sections are not expanded or collapsed. Instead, they are stowed in substantially the same configuration as their deployed state, apart from being flexed or bend about the reel axis of the respective collector. As there is no relative movement between the different elements in the noise mitigation section and there are no hoist lines or ladder tapes, there is a reduced risk of entanglement of the noise mitigation sections according to the present invention.
In one specific embodiment the support comprises a plurality of flexible bands that interconnect the plurality of sound dampening elements. The flexible bands can provide the flexibility about the reel axis, while keeping the sound dampening elements spaced apart from each other at fixed intervals along the respective flexible bands.
In an alternative embodiment the support comprises a first flexible sheet that interconnects the plurality of sound dampening elements and that seals or
: substantially seals the respective noise mitigation section between the plurality of sound dampening elements. By using the first {flexible sheet, the amount of air bubbles escaping from the noise mitigation structure between the sound dampening elements can effectively be reduced.
Preferably, the support comprises a second flexible sheet that seals or substantially seals the respective noise mitigation section at a side opposite to the first flexible sheet. Hence, a double-walled boundary can be formed to more effectively retain air bubbles in a laminar volume or in a bubble curtain at or in the noise mitigation section.
In a further embodiment each sound dampening element of the plurality of sound dampening elements comprises a beam extending in a lateral direction perpendicular to the deployment direction and parallel to the deployment plane when the respective noise mitigation section is unwound, wherein the beam comprises a beam body and a plurality of pockets formed in said beam body for trapping air inside the beam. The pockets with trapped air can effectively reduce or stop sound waves from travelling through the beam.
Preferably, the plurality of pockets is arranged in a single file in said lateral direction. Hence, the beams can be relatively narrow and compact to enable winding up of the respective noise mitigation section in several thin windings onto the respective collector.
Additionally or alternatively, the beam further comprises a plurality of through holes extending in the deployment direction through the beam body to allow air to pass through the beam. By allowing air to travel in bubbles through the beams, a bubble curtain can be formed to further mitigate noise.
In a further embodiment the beam further comprises a groove extending in the lateral direction along a bottom face of the beam body facing in the deployment direction to catch air bubbles rising up towards the beam,
wherein the plurality of pockets is contiguous with said groove. Hence, any air caught in the groove can flow from said groove into the plurality of air pockets without obstacles.
In an alternative embodiment the support comprises a netting, wherein the sound dampening elements are distributed over the netting. The netting may provide a more flexible noise mitigation structure compared to the previously discussed noise mitigation structure with the beam bodies.
Preferably, each sound dampening element of the plurality of sound dampening elements comprises a spherical body. The spherical bodies are less likely to get entangled in the netting and/or inside the windings on the respective collector.
In another embodiment each noise mitigation section has a thickness that allows for all windings of the respective noise mitigation section to be wound up on the respective collector of the plurality of collectors. Hence, all windings can effectively be retained on the respective collector within the capacity of said collector, i.e. within the radial height of the side flanges of the collector.
In a further embodiment each noise mitigation section of the plurality of noise mitigation sections is provided with one or more air supply tubes for releasing air bubbles across the respective noise mitigation section.
The one or more air supply tubes can be used to supply air to the noise mitigation sections to (re) fill up the pockets with air and/or to create a bubble curtain.
In a further embodiment the plurality of collectors is configured to remain above water or to be at least partially submerged. When the plurality of collectors remain above water, the collectors are less exposed to the underwater environment. Moreover, the collectors can be easily accessed for maintenance, repairs and/or replacement. Alternatively, when at least partially submerging the plurality of collectors, at least a part of the weight of the plurality of collectors can be carried by the water.
In a further embodiment one or more collectors of the plurality of collectors are offset in the deployment direction relative to the other collectors of the plurality of collectors. In this way, it can be prevented that the operation of one of the collectors interferes with the operation of another one of the collectors. In particular, the collectors can be placed relatively close together, or even in a partially overlapping configuration, in the circumferential direction, without colliding. Consequently, the noise mitigation sections can be deployed as close as possible to each other in said circumferential direction to form a closed or substantially closed noise mitigation structure in said circumferential direction.
Preferably, the collectors of the plurality of collectors are alternately offset in the deployment direction. In this way, the collectors can be placed in an overlapping configuration most efficiently.
In a further embodiment the deployment mechanism further comprises one or more couplers for interconnecting the plurality of noise mitigation sections in the circumferential direction. The one or more couplers can effectively keep the interconnected noise mitigation sections together in the circumferential direction, thereby improving the structural integrity of the noise mitigation structure, when deployed, in said circumferential direction.
Preferably, the one or more couplers are configured for progressively interconnecting the plurality of noise mitigation sections downstream of the plurality of collectors in the deployment direction as the plurality of noise mitigation sections are being unwound. In other words, the one or more couplers can be added to the noise mitigation structure as it is being deployed. In this way, the noise mitigation structure can be stowed on the collector in separate noise mitigation sections, which are interconnected only during or after deployment.
In one embodiment the one or more couplers comprises a connection wire extending alongside a first noise mitigation section of the plurality of noise mitigation sections in the deployment direction, wherein the first noise mitigation section is provided with a first eyelet that projects from the first noise mitigation section and that is configured to be fitted around the connection wire when the first noise mitigation section is deployed in said deployment direction. In other words, the connection wire can effectively be threaded through the first eyelet to connect said first noise mitigation to the connection wire. The first eyelet can conveniently be wound up together with the first noise mitigation section in several windings on the respective collector.
Preferably, the noise mitigation system further comprises a threading pin that is attached to an end of the connection wire for threading said end through the first eyelet. The threading pin can be inserted through the first eyelet more reliably than the end of the connection wire.
More preferably, the noise mitigation system further comprises a holder for holding the threading pin in place in the deployment direction while allowing passage of the first eyelet along said threading pin in the deployment direction. The holder can hold the threading pin in place so that it does not need to be held in place manually. As the holder is configured to allow for passage of the first eyelet along the threading pin, the closed first eyelet can be passed onto or over the connection wire without being obstructed by the holder.
In a further embodiment thereof the connection wire extends alongside and in between the first noise mitigation section and a second noise mitigation section of the plurality of noise mitigation sections, wherein the second noise mitigation section is provided with a second eyelet that projects from the second noise mitigation section and that is configured to be fitted around the connection wire when the second noise mitigation section is deployed in said deployment direction, wherein the first eyelet and the second eyelet are offset in the deployment direction. Therefore, both eyelets can be fitted around the same connection wire, one after the other, thereby interconnecting the respective noise mitigation sections via said connection wire. Moreover, both eyelets can conveniently be wound up together with the first noise mitigation section and the second noise mitigation section, respectively, in several windings on the respective collectors.
In a further embodiment thereof the noise mitigation system is provided with a winch that is connected to an opposite end of the connection wire for pulling in or paying out said connection wire. The winch can be used to aid the unwinding or winding of the noise mitigation sections. Additionally or alternatively, the winch can be used to pull the connection wire from the eyelets, for example when the noise mitigation sections need to be disconnected and/or released quickly, in case of emergency.
In an alternative embodiment the noise mitigation system is provided with coupling profiles extending alongside opposing edges of adjacent noise mitigation sections, wherein the one or more couplers comprises a coupling shoe that is configured to interconnect the adjacent noise mitigation sections by engaging the respective coupling profiles. The coupling shoe and the coupling profiles may for example have complementary shapes, so that a form-fitting or shape-fitting engagement can be obtained. The coupling profiles can be flexible to be wound up together with the respective noise mitigation sections, while the coupling shoe can be added as the respective noise mitigation sections are being unwound.
Preferably, the coupling shoe is configured to engage the respective coupling profiles in a form-fitting manner that allows sliding of the coupling shoe along the respective coupling profiles in the deployment direction while restricting relative movement between the adjacent noise mitigation sections in a lateral direction perpendicular the deployment direction. Hence, the structural integrity of the noise mitigation structure can be ensured in the circumferential direction, while the coupling shoe can be freely positioned along the noise mitigation sections in the deployment direction.
Optionally, the coupling shoes can be spaced apart using spacing elements, such as a ladder strip or the like.
In a further alternative embodiment the one or more couplers comprises a plurality of superimposed slats that extend at least partially along the noise mitigation structure in the circumferential direction to hold the noise mitigation sections together, wherein the noise mitigation system is provided with a ladder strip that defines the spacing between the plurality of slats in the deployment direction and hoisting lines to pull up or let down the plurality of slats alongside the noise mitigation structure in the deployment direction. The plurality of slats may provide a skeleton or exoskeleton-like structure around the noise mitigation sections to hold them together in the circumferential direction. Unlike the previously discussed embodiments, the noise mitigation sections do not require any special coupling elements and can be relative simple in construction.
Preferably, each slat of the plurality of slats comprises a plurality of slat sections which are interconnected in the circumferential direction by a removable joint. The slat sections can therefore be easily disconnected, for example in case of emergency.
In a further embodiment the carrier comprises a first carrier section and a second carrier section which are configured to articulate relative to each other about one or more gripper axes, parallel to the deployment direction, between an open state and a close state, wherein the plurality of noise mitigation sections are grouped into a first group of noise mitigation sections that are carried by and move together with the first carrier section and a second group of noise mitigation sections that are carried by and move together with the second carrier section relative to the first carrier section and the first group of noise mitigation sections. Hence, the carrier can be moved into state to be fitted around the source of sound, for example a part of marine infrastructure, such as a pile or a column, before being moved into the closed state around said source of sound. The carrier can also be moved from the closed state to the open state to release the carrier and the noise mitigation structure from the source of sound, for example when stowing the noise mitigation structure or in case of emergency release.
In a further embodiment the deployment mechanism further comprises a ballast member at a bottom end of the noise mitigation structure in the deployment direction. The ballast member can effectively keep the noise mitigation sections down, submerged and/or in a tensioned state.
Preferably, the ballast member interconnects the plurality of noise mitigation sections at said bottom end.
Hence, the ballast member can add to the structural integrity of the noise mitigation structure at said bottom end.
Additionally or alternatively, the ballast member comprises a first ballast section and a second ballast section which are configured to articulate relative to each other about one or more gripper axes, parallel to the deployment direction, between an open state and a closed state. Like the carrier and the groups of noise mitigation sections, the ballast member can be moved between the open state and the closed state to move the noise mitigation structure around the source of sound, or to release said noise mitigation structure from said source of sound, for example during an emergency release.
According to a second aspect, the invention provides a method for mitigating underwater sound emissions from a source of sound using the noise mitigation system according to any one of the embodiments according to the first aspect of the invention, wherein the method comprises the step of: - deploying the noise mitigation structure in the deployment direction from said carrier to extend in the circumferential direction around the source of sound by unwinding the plurality of noise mitigation sections from the plurality of windings.
The method relates to the practical implementation of the noise mitigation system according to the first aspect of the invention and therefore has the same technical advantages, which will not be repeated hereafter.
In one embodiment the method further comprises the step of: - stowing the noise mitigation structure in a retraction direction opposite to the deployment direction by winding up the plurality of noise mitigation sections in the plurality of windings onto the plurality of collectors.
In another embodiment of the method the plurality of collectors remains above water or is at least partially submerged during the winding up or unwinding.
In another embodiment the method further comprises the step of: - interconnecting the plurality of noise mitigation sections in the circumferential direction.
Preferably, the plurality of noise mitigation sections is progressively interconnected downstream of the plurality of collectors in the deployment direction as the plurality of noise mitigation sections are unwound.
In another embodiment of the method the method further comprises the step of: - unwinding, removing and/or replacing a single noise mitigation section of the plurality of noise mitigation sections while the other noise mitigation sections of the plurality of noise mitigation sections remain operational.
The various aspects and features described and shown in the specification can be applied, individually, wherever possible. These individual aspects, in particular the aspects and features described in the attached dependent claims, can be made subject of divisional patent applications.
For example, the couplers may be applied independently from the rest of the deployment mechanism, and specifically independently from the collectors and the winding/unwinding process. Moreover, the sound dampening elements, and in particular the specific features of the beam bodies, may be applied independently of the deployment mechanism, and specifically independently from the collectors and the winding/unwinding process. Additionally, the use of two flexible sheets to form a double-walled boundary for air bubbles in the noise mitigation section, may be applied independently of the sound dampening elements of the same noise mitigation section, and/or independently of the deployment mechanism, the collectors and/or the winding/unwinding process.
The invention will be elucidated on the basis of an exemplary embodiment shown in the attached schematic drawings, in which: figure 1 shows an isometric view of a noise mitigation system for mitigating underwater sound emissions from a source of sound, according to a first exemplary embodiment of the invention, in a deployed state; figure 2 shows an isometric view of the noise mitigation system according to figure 1 in a partially stowed state; figure 3 shows a top view of the noise mitigation system according to figure 1 in a closed state and an open state;
figure 4 shows an isometric view of a noise mitigation section and collector of the noise mitigation system of figure 1;
figure 5 shows a front view of the noise mitigation section and its respective collector according to figure 4 together with an adjacent noise mitigation section and its respective collector;
figure 6 shows a cross section of the noise mitigation section and its respective collector according to figure 4;
figure 7 shows a simplified isometric view of the noise mitigation section and its respective collector according to figure 4, exposing a plurality of air supply tubes;
figure 8 shows a detail, isometrically from below, of the noise mitigation section according to the circle VIII in figure 4;
figure 9 shows a bottom view of the same detail of the noise mitigation section as shown in figure 8;
figure 10 shows a detail of an alternative noise mitigation section according to a second exemplary embodiment of the invention;
figure 11 shows a detail of a further alternative noise mitigation section according to a third exemplary embodiment of the invention;
figure 12 shows a front view of a further alternative noise mitigation section and its respective collector according to a fourth exemplary embodiment of the invention;
figures 13A-13D shows a detail, isometrically from above, of a coupler during the steps of interacting with the adjacent noise mitigation sections, according to the circle XIII in figure 1;
figure 14 shows a detail, in front view, of an alternative coupler interacting with alternative noise mitigation sections according to a fifth exemplary embodiment of the invention; figure 15 shows, in cross section according to line XV-XV in figure 14, the alternative coupler and the alternative noise mitigation sections of figure 14; figure 16 shows a detail, isometrically {from above, of a further alternative coupler interacting with further alternative noise mitigation sections according to a sixth exemplary embodiment of the invention; and figure 17 shows an isometric view of a further alternative noise mitigation section and collector according to a seventh exemplary embodiment of the invention.
Figures 1-3 show a sound attenuation system or a noise mitigation system 1 according to a first exemplary embodiment of the invention. The noise mitigation system 1 can be used to reduce, dampen, attenuate and/or mitigate subsea or underwater sound emissions from a source of sound, for example as a result of marine or offshore construction, in particular the placement of windmills, or when drilling for oil or gas.
The noise mitigation system 1 comprises a carrier 2, a deployment mechanism 3 and a noise mitigation device, construction or structure 4. The deployment mechanism 3 is carried or held by the carrier 2 and is configured for deploying the noise mitigation structure 4 in a deployment direction D from or relative to said carrier 2, from an at least partially stowed state, as shown in figure 2, into a deployed state, as shown in figure 1. The deployment direction D is facing towards or at least has a component directed towards the seabed. In this example, the deployment direction D is vertical or substantially vertical.
The carrier 2 is configured to be placed on and/or suspended from a vessel (not shown), optionally connected to or integrated as part of a frame or a gripper- like frame (not shown} that can be pivoted from a raised position at or above the deck of the vessel, to a lowered position outside of the vessel.
As best seen in figure 3, the carrier 2 comprises a carrier body 20 extending in a circumferential direction
C about or concentric to a central axis A. In this example, the central axis A extends parallel or substantially parallel to the deployment direction D. The carrier body 20 is ring-shaped or substantially ring-shaped. In this example, the carrier body 20 is polygonal, in particular hexagonal, thus having six distinct sides. Alternatively, the carrier body 20 may be circular or substantially circular.
Moreover, in this example, the carrier body 20 is divided into a first carrier section 21 and a second carrier section 22 which can hinge, rotate or articulate relative to each other, like the jaws of a gripper, between a closed state, as shown in solid lines in figure 3, and an open state, as shown in dashed lines in figure 3. In particular, the carrier 2 comprises one or more hinges 23, 24 to enable articulating of the carrier sections 21, 22 about one or more gripper axes G, parallel to the central axis A. In the open state, the carrier 2 can be moved or arranged around a marine construction, for example a pile or a column, after which it is closed. Similarly, the carrier 2 can be opened to remove or release the carrier 2 from the marine construction.
As further shown in figures 1 and 2, the noise mitigation system 1 is provided with a ballast member 9 for adding weight or mass to the noise mitigation structure 4 as it is being deployed. In this example, the ballast member 9 is formed like or comprises a ring. In particular, the ballast member 9 comprises or is divided into a plurality of ballast sections 91, 92, at least two of which can articulate to open in the same way as and simultaneously with the previously described carrier sections 21, 22.
The deployment mechanism 3 comprises a plurality of collectors 31-36 for collecting and deploying the noise mitigation structure 4 in a manner that will be discussed in more detail hereafter. Each collector 31-36 comprises a reel 30 having a reel hub and two side flanges. The reel 30 is rotatable in a winding direction W about a reel axis R.
In this example, the reel axis R of each reel 30 extends in a lateral direction Y perpendicular to the deployment direction D.
As further shown in figure 1, the collectors 31- 36 are alternately offset in the deployment direction D. In other words, of each pair of adjacent collectors 31-36, one is placed higher/lower than the other. Hence, the collectors 31-36 can be placed relatively close together, or even in a partially overlapping configuration, as shown in figure 5, in the circumferential direction C, without colliding.
In this example, all collectors 31-36 are conveniently located above water or above water level H.
As best seen in figure 1, the noise mitigation structure 4, when deployed, defines or forms a wall, a screen or a shell 40 extending in the circumferential direction C about a source of sound, in particular an underwater source of sound. In this example, the shell 40 has a polygonal cross section, in particular hexagonal, similar to the shape of the carrier 2. The shell 40 is not fully closed, solid or water-tight. Instead, it may have an open or water-permeable surface.
The noise mitigation structure 4 comprises or is divided into a plurality of noise mitigation sections 41-46 which are distributed in the circumferential direction C to form the aforementioned shell 40. Each noise mitigation section 41-46 has an upper end that is connected or fixed to the reel 30 of a respective collector 31-36 of the plurality of collectors 31-36 to be rolled up or wound up over or in several windings on or onto the reel 30 of the respective collector 31-36. In particular, each noise mitigation section 41-46 is wound up in the winding direction W about the reel axis R along a spiral path S, as shown in figure 6 for the first noise mitigation section 41 only.
As a result, the noise mitigation structure 4 is gradually or progressively pulled up in a retraction direction E opposite to the deployment direction D, and can be stowed away into several winding packages on the respective collectors 31-36. Similarly, the noise mitigation sections 41-46 can be unrolled, paid out or unwound from the respective collectors 31-36, in order to gradually or progressively deploy the noise mitigation structure 4 in the deployment direction D.
Note that, in the deployed state of the noise mitigation structure 4 in figure 1, the noise mitigation sections 41-46 are unwound over a deployment length L. The plurality of collectors 31-36 is configured for winding up the plurality of noise mitigation sections 41-46 over at least seventy percent, preferably at least eighty percent and most preferably at least ninety percent of their deployment length L.
Figure 4 shows a first noise mitigation section 41 of the plurality of noise mitigation sections 41-46 in more detail. It will be appreciated that this first noise mitigation section 41 is representative of the other noise mitigation sections 42-46 as well, which will therefore not be discussed in further detail.
As shown in figure 4, the first noise mitigation section 41 comprises a support 5 and a plurality of sound dampening elements 6 supported by and distributed over said support 5. The support 5 is flexible in the winding direction W about the reel axis A. In particular, the support 5 defines a deployment plane P that can be bend into a single-curved or single-bend plane about the reel 30 of the respective collector 31-36.
In this example, the support 5 is formed by a plurality of flexible strips or bands 51-54, for example from a strong fabric, extending in the deployment direction
D through or along the plurality of sound dampening elements 6. The sound dampening elements 6 are attached or fixed to the flexible bands 51-54 at spaced apart positions, preferably at equal or constant intervals spacing distance. Said interval or spacing distance remains the same or substantially the same, even when the first noise mitigation section 41 is wound up onto the reel 30 of the respective collector 31, considered along the spiral path S.
In this example, each sound dampening element 6 is formed by or comprises a beam 60. The beam 60 extends in the lateral direction Y when the first noise mitigation section 41 is unwound. In particular, the beams 60 of the plurality of sound dampening elements 6 extend parallel or substantially parallel to each other.
As shown in more detail in figures 8 and 9, each beam 60 comprises a beam body 61 and a plurality of cavities, recesses or pockets 62 formed in said beam body 61 for trapping air inside the beam 60. The pockets 62 are blind, meaning that they do not pass completely through the beam body 61.
Note that the plurality of pockets 62 is arranged and/or aligned in a single row or file in the lateral direction Y. Consequently, the beam body 61 is designed to be relatively narrow and extend as close as possible along the pockets 62. In particular, the first noise mitigation section 41 has a thickness that is thin enough to allow for all windings of the first noise mitigation section 41 to be wound up on the respective collector 31.
Alternatively, the beam body 61 may be provided with pockets {not shown) arranged in multiple rows.
Opticnally, as best seen in figure 9, the beam 6 further comprises a plurality of through holes 63 extending in the deployment direction D through the beam body 61 to allow air to pass through the beam 6. In this example, the pockets 62 and the through holes 63 alternate in the lateral direction Y.
In this example, the beam 6 further comprises a groove 64 extending in the lateral direction Y along a bottom face of the beam body 61 facing in the deployment direction D to catch air bubbles rising up towards the beam 6. The plurality of pockets 62 and/or the plurality of through holes 63 is contiguous with said groove 64.
As shown in figure 7, the first noise mitigation section 41 may optionally be provided with one or more air supply tubes 7 for supplying air to the noise mitigation structure 4. In particular, the one or more air supply tubes 7 can supply air to fill the pockets 62 in the beams 6 of figures 8 and 9, or to create a bubble curtain or a bubble curtain passing through the through holes 63 in the same beams 6. In this example, as shown in figure 7, the one or more air supply tubes 7 comprises a main tube 70 and one or more branches 71-76 branching off from said main tube 70. The one or more air supply tubes 7 are flexible so as to be rolled up or wound up together with the support 5 about the reel 30 of the respective collector 31.
Figure 10 shows an alternative noise mitigation section 141 according to a second exemplary embodiment of the invention, which differs from the previously discussed first noise mitigation section 41 only in that the support 105 is formed by a first flexible sheet 150 that seals or substantially seals the alternative noise mitigation section 141 between the plurality of sound dampening elements 6. The first flexible sheet 150 may be water-tight
Or porous.
Figure 11 shows a further alternative noise mitigation section 241 according to a third exemplary embodiment of the invention, that only differs from the previously discussed noise mitigation section 141 according to the second exemplary embodiment only in that its support
205 is formed by a first flexible sheet 251 and a second flexible sheet 252 extending on opposite sides of the beam bodies 60. Both sheets 251, 252 may seal or substantially seal a volume of water and/or air in between. As such, the sheets 251, 252 can define a double-walled boundary for the respective further alternative sound mitigation section 241 that better retains air that is supplied to said further alternative sound mitigation section 241.
In a further alternative embodiment (not shown), the double-walled boundary can also be formed without the use of intermediate beam bodies 60 to just form a double- wall enclosed volume for containing air bubbles.
Figure 12 shows a further alternative noise mitigation section 341 according to a fourth exemplary embodiment of the invention, which differs from the further alternative noise mitigation section 241 according to the third exemplary embodiment of the invention only in that the beam bodies 360 are alternately offset in the lateral direction Y so as to a form alternating obstacles (not necessarily limited to beams) for air bubbles that rise up through the further alternative noise mitigation section 341 {from the air supply tubes 70, 71. In particular, the beam bodies 360 alternately end or terminate short of the full width of the further alternative noise mitigation section 341 in the lateral direction Y. As such, they define a meandering path for the air bubbles that retain the air bubbles for as long as possible inside the further alternative noise mitigation section 341.
The further alternative noise mitigation section 341 may be provided with the same double-walled configuration of the two flexible sheets 351, 352 as in figure 11.
Note that the further alternative noise mitigation section 341 does not necessarily need to be combined with beam bodies 360 having noise mitigation or noise dampening features. Instead, the beam bodies 360 may be shaped solely to hinder the rise of air bubbles.
As best seen in figure 1, the noise mitigation sections 41-46 are interconnected in the circumferential direction C by a plurality of couplers 8, to increase the structural rigidity or integrity of the noise mitigation structure 4 in said circumferential direction C. The couplers 8 are configured interconnecting the noise mitigation sections 41-46 gradually, progressively and/or in steps. In particular, the couplers 8 interconnect the noise mitigation sections 41-46 below or downstream of the collectors 31-36 in the deployment direction D as the noise mitigation sections 41-46 are being unwound.
In this example, the couplers 8 comprise a plurality of connection wires 80 extending in the deployment direction D alongside the plurality of noise mitigation sections 41-46. In particular, each connection wire 80 of the plurality of connection wires 80 extends alongside and/or in between a pair of adjacent noise mitigation sections 41-46.
The noise mitigation system 1 is further provided, at or near the carrier 2, with one or more winches 23 to pull in or pay out a length of the connection wires 80 in the deployment direction D or the retraction direction E.
Moreover, as best seen in figure 4, the first noise mitigation section 41 is provided with a plurality of first eyelets 65 and a plurality of second eyelets 66 projecting {from opposite sides of the first noise mitigation section 41 in the lateral direction Y. Each eyelet 65, 66 has a closed, ring-shaped eye 67 and an arm 68 for positioning said eye 67 at a distance from the support 5. The plurality of first eyelets 65 are offset in the deployment direction D relative to the plurality of second eyelets 65, such that the eyelets 65, 66 of adjacent noise mitigation sections 41, 42, as shown in figure 5, do not interfere with each other.
As shown in figure 4, in this example, the eyelets 65, 66 are alternately connected to opposite ends of selected beams 60 of the first noise mitigation section 41.
Note that the reel 30 of the respective collector 31 is sufficiently wide to receive and wind up the support 5 together with the eyelets 47, 48 projecting from the opposite sides thereof.
As shown in figure 5, the collectors 31-36 are placed in an overlapping configuration such that the eyelets 65, 66 of a pair of adjacent noise mitigation sections 41, 42 are aligned with or along the connection wire 80 extending between the pair of noise mitigation sections 41, 42. The eyelets 65, 66 are configured to be fitted onto or around the connection wire 80 when the respective noise mitigation sections 41, 42 are deployed in the deployment direction D.
As the eyes 67 of the eyelets 65, 66 are shaped as closed rings, they have to be passed over the connection wire 80 in the deployment direction D. Consequently, the connection wire 80 has to be held in position in some way to facilitate this passing over of the eyelets 65, 66.
Figures 13A-13D show a pass-over mechanism 81 to facilitate this passing over.
As shown in figure 13A, the pass-over mechanism 81 comprises a threading needle or pin 82 that is attached to an end of the connection wire 80 for threading said end through the eyelets 65, 66 as the eyelets 65, 66 are moved in the deployment direction D. The pass-over mechanism 81 further comprises a holder 83 for holding the threading pin 82 in place while allowing passage of the eyelets 65, 66 along said threading pin 82 in the deployment direction D.
In this exemplary embodiment, the holder 83 comprises a gate member 84 that is configured for allowing passage of the eyelets 65, 66 in the deployment direction D while never letting go of the threading pin 82.
Specifically, the gate member 84 comprises a roller body 85 that is rotatable about a gate axis B perpendicular to the deployment direction D and has a passage 86 formed therein into which the eyelets 65, 66 can enter in an entry orientation of the roller body 85 about the gate axis B, as shown in figure 13C, and from which the eyelets 65, 66 can exit in an exit orientation of the roller body 85 about the gate axis B, as shown in figure 13D. The roller body 85 is further provided with a flange 87 that is configured to always be engaged in either an upper part or a lower part of a correspondingly shaped slot 88 in the threading pin 82 to hold the threading pin 82 in place in the deployment direction D while the roller body 85 rotates.
Optionally, the pass-over mechanism 81 is provided with one or more toothed wheels or cog wheels 89, as shown in figures 13A-13D, that can provide additional stability to the threading pin 82 while allowing passage of the eyelets 65, 66 in the spaces between the teeth or the cogs. In this example, the cog wheels 89 are rotatable about cog wheel axes perpendicular to the deployment direction D and the gate axis B.
Figure 14 shows an alternative coupler 408 for cooperation with a pair of further alternative noise mitigation sections 441, 442, according to a fifth exemplary embodiment of the invention. The further alternative noise mitigation sections 441, 442 differ from the aforementioned noise mitigation sections 41-46 only in that they are provided, alongside opposing edges thereof, with coupling profiles 465, 466, in this case in the form of flexible ball lines. Like the previously discussed eyelets 65, 66, the coupling profiles 465, 466 are configured to be wound up onto the respective collectors (not shown} as part of the further alternative noise mitigation sections 441, 442.
The alternative coupler 408 differs {from the previously discussed coupler 8 in that it comprises a coupling shoe 480 that is configured to interconnect the further alternative noise mitigation sections 441, 442 by engaging the respective coupling profiles 465, 466. In particular, the coupling shoe 280 comprises two funnels 481, 482 that are complementary in shape to the coupling profiles 465, 466 to engage said coupling profiles 465, 466 in a form-fitting manner, while allowing sliding of the coupling shoe 480 along the respective coupling profiles 465, 466 in the deployment direction D. The funnels 481, 482 prevent or restrict relative movement between the further alternative noise mitigation sections 441, 442 in the lateral direction Y. more in particular, as shown in figure 15, the funnels 481, 482 at least partially enclose the respective coupling profiles 465, 466 to an extent that they can not be removed from the funnels 481, 482 in a direction other than the deployment direction D.
Figure 16 shows a further alternative coupler 508 for cooperation with a pair of further alternative noise mitigation sections 541-543 according to a sixth exemplary embodiment of the invention. The further alternative noise mitigation sections 541-543 differ from the aforementioned noise mitigation sections 41-46, 141, 241, 341, 441, 442 only in that they themselves are not provided with any coupling elements. Instead, the further alternative coupler 508 comprises a plurality of slats 580. The slats 580 are superimposed in the deployment direction D and can be condensed or collapsed, with the use of a ladder strip 58%, into a compact stack, or expanded into an expanded state with a fixed spacing between the individual slats 380, much like Venetian blinds. Each slat 580 extends at least partially along the noise mitigation structure 504 in the circumferential direction C to hold the noise mitigation sections 541-543 together. The plurality of slats 580 therefore acts like a collapsible and extendible frame or skeleton that can be collapsed and extended around the noise mitigation structure 4 as it is being stowed and deployed.
In this example, each slat 580 comprises or is divided into a plurality of slat sections 581-583, one for each noise mitigation section 541-543. The slat sections
581-583 are preferably interconnected by a removable joint, for example a removable connection cable 589 extending through aligned holes 588 in the respective slat sections 581-583. By removing the connection cable 589, the slat sections 581-583 can be easily disconnected to move together with the corresponding sections of the carrier, the ballast member 9 and/or the noise mitigation structure 504.
Figure 17 shows a further alternative noise mitigation section 641 according to a seventh exemplary embodiment of the invention that differs from the previously discussed noise mitigation sections 41, 141, 241, 341, 441, 442, 541 in that the support 605 is formed by netting 650. The sound dampening elements 606 are distributed over and/or connected to said netting 650. In this example, the sound dampening elements 606 comprise spherical bodies 660, in particular made of a suitable foam or the like.
A method for mitigating underwater sound emissions from a source of sound using the previously discussed noise mitigation system 1 will now be briefly elucidated with reference to the drawings.
As shown in figures 1 and 2, the method comprises the steps of deploying (from figure 2 to figure 1) or stowing (from figure 1 to figure 2) the noise mitigation structure 4 in the deployment direction D and the retraction direction E, respectively, relative to the carrier 2. In the deployed state of figure 1, the noise mitigation structure 4 extends in the circumferential direction C around the source of sound.
During the deployment, the respective noise mitigation sections 41-46 are unrolled or unwound from their respective collectors 31-36. The noise mitigation sections 41-46 may be interconnected using the couplers 8.
During stowing, the respective noise mitigation sections 41-46 are pulled in or wound up onto the respective collectors 31-36,
In this example, during deployment, stowing and/or operation of the noise mitigation system 1, the collectors 31-36 are supposed to remain above the water level H. Alternatively, the collectors 31-36 may be at least partially submerged (not shown).
Finally, in case of maintenance, repairs or replacement, only the affected noise mitigation section(s) 41-46 can be partially or fully unwound from its/their respective collector(s) 31-36, independently of the other noise mitigation sections 41-46 and their respective collectors 31-36. In other words, the other noise mitigation sections 41-46 can remain operational.
It is to be understood that the above description is included to illustrate the operation of the preferred embodiments and is not meant to limit the scope of the invention. From the above discussion, many variations will be apparent to one skilled in the art that would yet be encompassed by the scope of the present invention.
LIST OF REFERENCE NUMERALS
1 noise mitigation system 2 carrier 20 carrier body 21 first carrier section 22 second carrier section 23 winch 3 deployment mechanism 30 reel 31-36 collectors 4 noise mitigation structure 40 shell 41-46 noise mitigation sections 5 support 51-54 flexible bands 6 sound dampening element
60 beam 61 beam body 62 pocket 63 through hole 64 groove 65 first eyelet 66 second eyelet 67 eye 68 arm 7 air supply tube 70 main tube 71-76 branches 3 coupler 80 connection wire 81 pass-over mechanism 82 threading pin 83 holder 384 gate member 85 roller body 86 passage 87 flange 88 slot 89 cog wheel 9 ballast member 91 first ballast section 92 second ballast section 141 alternative noise mitigation section 105 support 150 sheet 241 further alternative noise mitigation section 205 support 251 first sheet 252 second sheet 341 further alternative noise mitigation section 305 support 351 first sheet 352 second sheet
360 beam 441, 442 further alternative noise mitigation sections 465, 466 coupling profiles 408 alternative coupler 480 coupling shoe 481, 482 funnels 541, 542 further alternative noise mitigation sections 508 further alternative coupler 580 slat 581-583 slat sections 584 slat body 585 slot 587 ladder strip 588 connection hole 589 connection cable 641 further alternative noise mitigation section 605 support 650 netting 606 sound dampening element 660 spherical body
A central axis
B gate axis
C circumferential direction
D deployment direction
E retraction direction
G gripper axis
H water level
L deployment length
P deployment plane
R reel axis
S spiral path
W winding direction
Y lateral direction
Claims (41)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2035366A NL2035366B1 (en) | 2023-07-13 | 2023-07-13 | Noise mitigation system and method for mitigating underwater sound emissions from a source of sound |
| PCT/NL2024/050239 WO2025014354A1 (en) | 2023-07-13 | 2024-05-13 | Noise mitigation system and method for mitigating underwater sound emissions from a source of sound |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2035366A NL2035366B1 (en) | 2023-07-13 | 2023-07-13 | Noise mitigation system and method for mitigating underwater sound emissions from a source of sound |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NL2035366A true NL2035366A (en) | 2024-05-30 |
| NL2035366B1 NL2035366B1 (en) | 2025-01-24 |
Family
ID=87974127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL2035366A NL2035366B1 (en) | 2023-07-13 | 2023-07-13 | Noise mitigation system and method for mitigating underwater sound emissions from a source of sound |
Country Status (2)
| Country | Link |
|---|---|
| NL (1) | NL2035366B1 (en) |
| WO (1) | WO2025014354A1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015103581A1 (en) | 2014-01-06 | 2015-07-09 | Wochner Mark | Underwater noise abatement apparatus and deployment system |
| US20170306582A1 (en) * | 2014-09-22 | 2017-10-26 | Karl-Heinz ELMER | Hydraulic noise suppressor and method for handling a hydraulic noise suppressor |
| EP2937466B1 (en) | 2014-04-25 | 2018-06-20 | Karl-Heinz Elmer | Device for mitigating under-water sound |
| CN113053345A (en) * | 2021-03-12 | 2021-06-29 | 清研特材科技(洛阳)有限公司 | Water curtain/foamed aluminum composite noise reduction method and noise reduction device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1784396B1 (en) * | 1968-08-03 | 1971-07-01 | Cordes Hugo Dipl Ing | Ram hammer with sound-absorbing jacket |
| DE102021116876A1 (en) * | 2021-06-30 | 2023-01-05 | August Penkert GmbH Technische Leder- und Kunststofferzeugnisse | Enclosure for sheet piling and drill pipes |
-
2023
- 2023-07-13 NL NL2035366A patent/NL2035366B1/en active
-
2024
- 2024-05-13 WO PCT/NL2024/050239 patent/WO2025014354A1/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015103581A1 (en) | 2014-01-06 | 2015-07-09 | Wochner Mark | Underwater noise abatement apparatus and deployment system |
| EP2937466B1 (en) | 2014-04-25 | 2018-06-20 | Karl-Heinz Elmer | Device for mitigating under-water sound |
| US20170306582A1 (en) * | 2014-09-22 | 2017-10-26 | Karl-Heinz ELMER | Hydraulic noise suppressor and method for handling a hydraulic noise suppressor |
| CN113053345A (en) * | 2021-03-12 | 2021-06-29 | 清研特材科技(洛阳)有限公司 | Water curtain/foamed aluminum composite noise reduction method and noise reduction device |
Non-Patent Citations (2)
| Title |
|---|
| ELMER K H ET AL: "Mitigation of Underwater Piling Noise Using New Hydro Sound Dampers (HSD)", INTERNET CITATION, 12 September 2011 (2011-09-12), pages 1 - 17, XP003032130, Retrieved from the Internet <URL:http://www.fmgm2011.org/> [retrieved on 20130801] * |
| KOSCHINSKI S ET AL: "Development of Noise Mitigation Measures in Offshore Windfarm Construction", FEDERAL AGENCY FOR NATURE CONSERVATION, 1 February 2013 (2013-02-01), pages 1 - 102, XP055962705, Retrieved from the Internet <URL:https://www.cbd.int/doc/meetings/mar/mcbem-2014-01/other/mcbem-2014-01-submission-noise-mitigation-en.pdf> [retrieved on 20220920] * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2025014354A1 (en) | 2025-01-16 |
| NL2035366B1 (en) | 2025-01-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9488026B2 (en) | Underwater noise abatement apparatus and deployment system | |
| KR101828267B1 (en) | Apparatus and method of laying an elongate article from a vessel | |
| US8814470B2 (en) | Oil containment assembly and method of using same | |
| NL8402545A (en) | METHOD AND APPARATUS FOR INSTALLING A FLEXIBLE PIPE BETWEEN A PLATFORM AND AN UNDERWATER BUOY. | |
| CA1210326A (en) | Offshore well head protector and method of installation | |
| US8202023B2 (en) | Self-standing riser and buoyancy device deployment and positioning system | |
| BR112014031082B1 (en) | method and system to provide control and shutdown capability | |
| BR112013017248B1 (en) | WATER INSTALLATION DEVICE, FLOATING INSTALLATION FRAMEWORK AND WATER EXTENSION INSTALLATION METHOD | |
| CN118753452B (en) | A deployment and recovery system for underwater heavy-load operation equipment | |
| KR20100021995A (en) | Method and apparatus for laying a marine pipeline | |
| NL2035366B1 (en) | Noise mitigation system and method for mitigating underwater sound emissions from a source of sound | |
| RU2466902C2 (en) | Anchors handling device | |
| NO310370B1 (en) | Method of installing a device for suppressing vortex-induced vibrations in a part of a subsea pipe | |
| AU701892B2 (en) | Combined apparatus for handling modules and tools and laying of elongated flexible articles from a vessel supported on a body of water | |
| US20160115667A1 (en) | Device For Anchoring A Raceway Mounting Of A Seabed-To-Surface Facility | |
| NL2022670B1 (en) | Device and method for offshore cable laying | |
| US9746104B2 (en) | Device for laying an elongate element in a stretch of water, associated installation and associated method | |
| JPH07292619A (en) | Floating bridge and its lifting device | |
| WO2004011837A1 (en) | Method and apparatus for laying/recovery of lines on a seabed | |
| EP3092636B1 (en) | Underwater noise abatement apparatus and deployment system | |
| RU2013294C1 (en) | Device for keeping the object afloat | |
| CN121228670A (en) | Lifting type flexible water body ecological wave-eliminating enclosure device and use method thereof | |
| US9719330B2 (en) | Subsea equipment pendulum arrestor and method for its use | |
| NO346430B1 (en) | Device for preventing an object from falling through a gap | |
| WO2018050877A1 (en) | System, apparatus and method |