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WO2006115403A1 - Ecran acoustique - Google Patents

Ecran acoustique Download PDF

Info

Publication number
WO2006115403A1
WO2006115403A1 PCT/NL2006/000222 NL2006000222W WO2006115403A1 WO 2006115403 A1 WO2006115403 A1 WO 2006115403A1 NL 2006000222 W NL2006000222 W NL 2006000222W WO 2006115403 A1 WO2006115403 A1 WO 2006115403A1
Authority
WO
WIPO (PCT)
Prior art keywords
sound
baffle board
sound source
lamellar array
wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/NL2006/000222
Other languages
English (en)
Inventor
Marinus Marias Boone
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Technische Universiteit Delft
Original Assignee
Technische Universiteit Delft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Technische Universiteit Delft filed Critical Technische Universiteit Delft
Priority to EP06733028A priority Critical patent/EP1877624A1/fr
Publication of WO2006115403A1 publication Critical patent/WO2006115403A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
    • E01F8/00—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic
    • E01F8/0094—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic constructions for generation of phase shifting
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
    • E01F8/00—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic
    • E01F8/0005—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement
    • E01F8/0041—Free-standing grates

Definitions

  • the invention relates to a baffle board for a sound source comprising a standing wall.
  • baffle boards are used for the protection against disturbing noise of the kind occurring near, for example, motorways.
  • Such baffle boards exist in various forms of screens disposed vertically or at an angle and may or may not- be permeable.
  • baffle boards to be erected must also be tall.
  • baffle boards In order to also effectively protect taller buildings behind the baffle board against disturbing noise, the baffle boards to be erected must also be tall.
  • there is a limit to the height of baffle boards because in order to render them sufficiently wind resistant they require a heavy foundation.
  • the aspect of unsightliness attached to tall baffle boards plays a role as well .
  • baffle board for a noise source, comprising a standing wall as well as a lamellar array provided on the wall, wherein the lamellae are ori- ented horizontally.
  • the lamellar array is embodied such that a wall portion is provided in the extended direction of the standing wall, possessing sound-insulating properties.
  • baffle board for a sound source comprising a standing wall and a lamellar array placed on the wall, wherein the lamellae are oriented vertically and wherein the lamellar array is permeable to sound.
  • baffle board for a sound source comprising a lamellar array, which is placed obliquely in relation to the horizon and which lamellar array is permeable to sound.
  • the object of the invention is to provide a baffle board that has a limited height, while nevertheless effec- tively reducing the sound behind the baffle board.
  • a further object of the baffle board according to the invention is to achieve an intended degree of sound reduction behind the baffle board with a construction that is less heavy than that of prior art baffle boards.
  • baffle board according to the inven- tion is characterized by one or several of the appended claims.
  • the baffle board is embodied with a standing wall, on which wall a lamellar array is provided whose lamellae extend horizontally and wherein the lamellar array allows light, air and sound to pass through.
  • a lamellar array is wind-permeable, thus allowing the foundation of the baffle board to be constructed less heavily.
  • the lamellar array effectively reduces the sound behind the baffle board because the lamellar array is permeable to sound.
  • the baffle board according to the invention is preferably realised such that the lamellae of the lamellar array extend from the wall substantially to a side where the sound source is located.
  • such an em- bodiment was shown to be capable of effectively reducing the sound by at least approximately 6 decibels at relevant heights behind the baffle board.
  • the lamellar array is advantageously embodied such that viewed at right angles to the wall, the lamellae extend both towards the side of the sound source and away from the side of the sound source.
  • the width of the respective lamella also increases with each higher placed lamella.
  • the result is ⁇ that with increasing height, sound from a sound source located at a low level and passing through the lamellar array will experience a prolonged travelling time at the exit side of the lamellar array facing away from the sound source.
  • the resulting interference at the exit side of the lamellar array is such that the original direction of the sound is deflected upwards, which improves the protective effect of the baffle board.
  • the baffle board according to the invention may be optimised by embodying the same such that each lamella has a predetermined width, so that each lamella of the lamellar array delimits an end portion of a sound path in the lamellar array that exits at the exit side of the lamellar array facing away from the sound source, which end portion links up with a begin portion of said sound path run- ning from the sound source to the entry side of the lamellar array facing the sound source, and that the sum of the distances of the begin portion and the end portion of each sound path that passes at least partly through the lamellar array, increases with the increasing height at which the lamellae delimiting the said sound path are placed.
  • the baffle board is characterized in that the length of the sound paths is predetermined according to a predetermined preferred direction into which the lamellar array directs the sound com- ing from the sound source.
  • the effectiveness of the baffle board with a view to the direction in which the sound reduction takes place is not so much determined by the orientation of the lamellae but rather by the width of the lamellae, which is related to the intended length of the sound paths.
  • K a constant a - the angle of the preferred direction wherein the lamellar array directs the sound in relation to the horizontal
  • L the length of the sound path partly delimited by the lamella and running between a sound source and the exit side of the lamellar array.
  • the mutual distance between adjacent lamellae of the lamellar array it is desirable for the mutual distance between adjacent lamellae of the lamellar array to be less than half the wavelength of the highest audio frequency to be in- fluenced; this corresponds to the shortest relevant wavelength. This achieves that the sound propagating between the lamellae has a flat wave front without transverse modes influencing the propagation path of the sound. This further avoids interferences at the exit side of the lamellar array, which would result in the occurrence of more than just the desired propagation path, and which would negatively influence the sound-reducing effect.
  • baffle board Although it generally suffices to embody the baffle board according to the invention with lamellae that extend solely from the wall towards the sound source, on occasion it is advantageous to also provide a lamella positioned directly above the wall and that extends from the wall to a side facing away from the sound source. This may avoid the scattering of sound to objects situated at a low level behind the baffle board.
  • a further advantage gained with the baffle board according to the invention is that because the lamellar array is provided on the wall of the baffle board, the possible wind gradient at the top of the wall is diminished, which prevents the sound to be reduced from being deflected towards the ground.
  • baffle board according to the invention will be further elucidated by way of an exemplary embodiment, which does not limit the appended claims.
  • a single figure schematically shows the baffle board according to the invention.
  • reference numeral 1 indicates the baffle board.
  • the baffle board 1 comprises a standing wall 2 and mounted on the wall 2 a lamellar array 3.
  • the figure shows that the lamellae 4, 5, 6, 7 of the lamellar array 3 substantially extend from the. wall 2 towards a side where the sound source 8 is located.
  • the lamellae may possibly also extend towards the side facing away from the sound source 8. This is not shown in the figure but is quite clear.
  • each lamella 4, 5, 6, 7 of the lamellar array 3 is positioned, the greater is the width of each respective lamella 4, 5, ⁇ , 7.
  • each lamella 4, 5, 6, 7 is preferably predetermined on the basis that each lamella 4, 5, 6, 7 of the lamellar array 3 delimits an end portion of a sound path in the lamellar array 3, which exits at the exit side 9 of the lamellar array 3 facing away from the sound source 8, which end portion links up with a begin portion of said sound path running from the sound source 8 to the entry side 10 of the lamellar array 3 facing the sound source.
  • the sum of the distances of the begin portion and the end portion increases with the increasing height at which the lamellae delimiting said sound path are placed.
  • the length of the sound path whose end portion A-B is delimited by lamella 4 of the lamellar array 3, is the same from the sound source 8 to the position of the wave front 13; in other words, the length of section S-A-B-C is the same as the length of section S-A'- B' -C.
  • One thing and another is realised by suitably choosing the width of the different lamellae 4, 5, 6 and 7.
  • the arrows 11 in the figure further schematically symbolise that by means of the device it is possible to real- ise a predetermined preferred direction in which the lamellar array 4, 5, 6, 7 sends the sound originating from the sound source 8.
  • the length of the sound paths up to the exit side 9 of the lamellar array 3 as defined in the foregoing is deter- mined subject to the desired preferred direction 11.
  • the mutual distance between the adjacent lamellae 4, 5, 6, 7 of the lamellar array 3 is further desirable for the mutual distance between the adjacent lamellae 4, 5, 6, 7 of the lamellar array 3 to be less than half the wavelength of the highest sound frequency to be influenced, or tantamount to that, to be less .than half the shortest wavelength still to be influenced.
  • a lowest lamella 14 is provided directly on top of the wall 2, which extends from the wall 2 to the side facing away from the sound source 8.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
  • Building Environments (AREA)

Abstract

L’invention concerne un écran acoustique (1) pour une source sonore, comprenant une paroi dressée (2) avec un ensemble lamellaire (3) placé sur la paroi, les lamelles (4, 5, 6, 7) étant orientées horizontalement et l’ensemble lamellaire étant perméable à la lumière, à l’air et au son.
PCT/NL2006/000222 2005-04-26 2006-04-25 Ecran acoustique Ceased WO2006115403A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06733028A EP1877624A1 (fr) 2005-04-26 2006-04-25 Ecran acoustique

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1028876A NL1028876C2 (nl) 2005-04-26 2005-04-26 Geluidsscherm.
NL1028876 2005-04-26

Publications (1)

Publication Number Publication Date
WO2006115403A1 true WO2006115403A1 (fr) 2006-11-02

Family

ID=35427286

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2006/000222 Ceased WO2006115403A1 (fr) 2005-04-26 2006-04-25 Ecran acoustique

Country Status (3)

Country Link
EP (1) EP1877624A1 (fr)
NL (1) NL1028876C2 (fr)
WO (1) WO2006115403A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2055838A1 (fr) * 2007-10-30 2009-05-06 Nederlandse Organisatie voor toegepast-natuurwetenschappelijk Onderzoek TNO Barrières antibruit
US20220081855A1 (en) * 2018-12-06 2022-03-17 Wavebreaker Ab Interference noise-control unit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4069768A (en) * 1975-05-28 1978-01-24 Bridgestone Tire Company Limited Device for controlling a propagation direction of noise
US4436179A (en) * 1981-01-09 1984-03-13 Japanese National Railways Noise control apparatus
JPH04140306A (ja) * 1990-10-01 1992-05-14 Bridgestone Corp 干渉型防音装置
EP0765968A1 (fr) * 1995-09-29 1997-04-02 Bridgestone Corporation Mur anti-bruit
EP0798426A1 (fr) * 1996-03-28 1997-10-01 Mitsubishi Denki Kabushiki Kaisha Dispositif de déphasage d'ondes et mur anti-bruit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4069768A (en) * 1975-05-28 1978-01-24 Bridgestone Tire Company Limited Device for controlling a propagation direction of noise
US4436179A (en) * 1981-01-09 1984-03-13 Japanese National Railways Noise control apparatus
JPH04140306A (ja) * 1990-10-01 1992-05-14 Bridgestone Corp 干渉型防音装置
EP0765968A1 (fr) * 1995-09-29 1997-04-02 Bridgestone Corporation Mur anti-bruit
EP0798426A1 (fr) * 1996-03-28 1997-10-01 Mitsubishi Denki Kabushiki Kaisha Dispositif de déphasage d'ondes et mur anti-bruit

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 016, no. 414 (M - 1303) 2 September 1992 (1992-09-02) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2055838A1 (fr) * 2007-10-30 2009-05-06 Nederlandse Organisatie voor toegepast-natuurwetenschappelijk Onderzoek TNO Barrières antibruit
WO2009058008A1 (fr) * 2007-10-30 2009-05-07 Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno Barrières antibruit
US20220081855A1 (en) * 2018-12-06 2022-03-17 Wavebreaker Ab Interference noise-control unit
US12325966B2 (en) * 2018-12-06 2025-06-10 Wavebreaker Ab Interference noise-control unit

Also Published As

Publication number Publication date
NL1028876C2 (nl) 2006-10-27
EP1877624A1 (fr) 2008-01-16

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