WO2021070271A1 - 振動試験装置および振動試験方法 - Google Patents
振動試験装置および振動試験方法 Download PDFInfo
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- WO2021070271A1 WO2021070271A1 PCT/JP2019/039722 JP2019039722W WO2021070271A1 WO 2021070271 A1 WO2021070271 A1 WO 2021070271A1 JP 2019039722 W JP2019039722 W JP 2019039722W WO 2021070271 A1 WO2021070271 A1 WO 2021070271A1
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- pipeline
- support
- vibration
- support member
- vibration test
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/12—Analysing solids by measuring frequency or resonance of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/08—Shock-testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/223—Supports, positioning or alignment in fixed situation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/24—Probes
- G01N29/2418—Probes using optoacoustic interaction with the material, e.g. laser radiation, photoacoustics
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/014—Resonance or resonant frequency
Definitions
- the present disclosure relates to a vibration test device and a vibration test method for testing the vibration of a pipeline attached to a structure.
- a pipeline facility 200 for infrastructure equipment such as electricity, water, and communication can be provided under a structure such as a bridge 210.
- the pipeline 10 is supported by a beam 220 of the bridge 210 at a plurality of support points, and is fixed at each support point by a fixing member such as a U-shaped bolt 230.
- the support point In pipeline equipment, the support point must be set at a location that does not resonate in order to prevent noise or abnormal stress in the pipeline caused by resonance with the structure. Therefore, it is necessary to measure the vibration characteristics of the pipeline (for example, natural frequency) based on the distance between the support points, the shape of the pipeline, the physical characteristics of the pipeline, etc., and reflect it in the design. There is. Since the actual pipeline equipment takes various forms depending on the shape of the pipeline, the restraint condition of the U-shaped bolt, etc., it is difficult to calculate the natural frequency of the pipeline on the desk. Therefore, it is necessary to measure the vibration of the actual equipment or the pipeline that imitates the actual equipment.
- the vibration characteristics of the pipeline for example, natural frequency
- Non-Patent Document 1 a test method using a vibration test device has been proposed (see, for example, Non-Patent Document 1).
- the conventional vibration test device is expensive because it requires a large hydraulic machine or the like, and further, due to the specifications, the measurement conditions (for example, span length, number of spans, etc.) are appropriately adjusted according to the form of the pipeline equipment. It was difficult to change, and it was difficult to measure the vibration characteristics of the pipeline before designing the actual equipment.
- the purpose of the present disclosure made in view of such circumstances is a vibration test device capable of easily reproducing the vibration of a pipeline and measuring the vibration characteristics of the pipeline before designing the actual equipment, at a low cost. And to provide a vibration test method.
- the vibration test device is a vibration test device for testing the vibration of a pipeline attached to a structure, and is joined to a wall surface at predetermined intervals to support a plurality of supports of the pipeline.
- a member a first fixing member for fastening the pipeline to the first support member at a position where one end of the pipeline protrudes from the first support member, and a second support at the other end of the pipeline.
- a second fixing member that fastens the pipeline to the second support member at a position protruding from the member, a vibration portion that applies a vibration force to the support member, and a detection that detects vibration of the pipeline. It is characterized by including a unit and a measuring unit for measuring the vibration characteristics of the pipeline.
- the vibration test method is a vibration test method for testing the vibration of a pipeline attached to a structure, in which a plurality of support members are joined to a wall surface at predetermined intervals, and the pipeline is connected to the wall surface.
- a step of fastening the pipeline to the second support member and a vibrating portion apply a vibrating force to the support member.
- the detection unit includes a step of detecting the vibration of the pipeline
- the measuring unit includes a step of measuring the vibration characteristics of the pipeline.
- a vibration test apparatus and a vibration test method capable of easily reproducing the vibration of a pipeline and measuring the vibration characteristics of the pipeline before designing an actual facility at low cost. be able to.
- FIGS. 1 to 4 The configuration of the vibration test apparatus 100 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 4.
- Figure 4A is a diagram showing the I 1 -I 1 section in FIG.
- Figure 4B is a diagram illustrating the I 2 -I 2 section in FIG.
- Figure 4C is a diagram showing the I 3 -I 3 section in FIG.
- the vibration test device 100 is a device used in a laboratory to reproduce and measure the vibration of a pipeline attached to a structure.
- the pipe line 10 is a pipe made of resin or metal, and is, for example, a hard vinyl pipe, an FRP (Fiber Reinforced Plastics) pipe, a steel pipe, a FRPM (Fiberglass Reinforced Plastic Mortar) pipe, or the like.
- FRP Fiber Reinforced Plastics
- FRPM Fiber Reinforced Plastic Mortar
- FIG. 1 the case where one pipeline 10 is installed in the vibration test apparatus 100 is taken as an example, but the form of the conduit 10 installed in the vibration test apparatus 100 is not particularly limited. Absent. It may be installed in the vibration test device 100 in the form of, for example, two-row two-stage (see FIG. 2A) and two-row three-stage (see FIG. 2B), simulating the form of being laid in the actual pipeline equipment. .. Further, as long as the pipeline 10 has a cylindrical shape, the diameter or material is not particularly limited, and
- FIG. 1 is a view seen from the ceiling direction except for the measuring unit 105.
- the vibration test device 100 is attached to a wall surface 20 provided in a direction perpendicular to the ground.
- the pipeline 10 is installed in the vibration test device 100 so as to be parallel to the ground.
- the wall surface 20 may be a wall surface used in a general building, and the material or the like is not particularly limited.
- the vibration test device 100 includes a plurality of support members 101a and 101b, a plurality of fixing members 102a and 102b, a vibration unit 103, a detection unit 104, and a measurement unit 105.
- the support members 101a and 101b are joined to the wall surface 20 at a predetermined interval S.
- the wall surface 20 and the support members 101a and 101b are joined by a known method such as bolt joining, welding joining, and adhesive joining. The operator can appropriately adjust the distance S between the support member 101a and the support member 101b.
- the support member (first support member) 101a supports the pipeline 10 at the support point (first support point) X 1 of the support member 101a.
- the support member 101a supports the pipeline 10 at a support point X1 of the support member 101a at a position where one end A of the conduit 10 protrudes in the direction of the arrow A1.
- the support member 101a is provided with a through hole H for inserting the fixing member 102a.
- the support member (second support member) 101b supports the pipeline 10 at the support point (second support point) X 2 of the support member 101b.
- the support member 101b supports the pipeline 10 at the support point X2 of the support member 101b at a position where the other end B of the pipeline 10 protrudes in the direction of the arrow B1.
- the support member 101b is provided with a through hole H for inserting the fixing member 102b.
- the support members 101a and 101b may have a configuration in which the surface on which the pipeline 10 is installed is flat and can stably support the pipeline 10.
- the support members 101a and 101b may be made of L-shaped steel, for example, as shown in FIG. 3A or FIG. 3B.
- the support members 101a and 101b may be made of flat steel, for example, as shown in FIG. 3C.
- the support members 101a and 101b may be made of H-shaped steel, for example, as shown in FIG. 3D.
- the distance between the support point X 1 and the support point X 2 is called the span length.
- the number of sections between support points in the pipeline 10 supported by a plurality of support members is called the number of spans.
- the operator can appropriately change the number of spans by adjusting the number of the support members 101 and the joint position between the support members 101 and the wall surface 20.
- a vibrating force is applied to the vibrating portion P by the vibrating portion 103.
- an impact excitation force is applied to the vibration point P.
- the support members 101a and 101b vibrate based on the applied excitation force.
- the vibrations of the support members 101a and 101b are transmitted to the pipeline 10.
- the excitation point P is set at a predetermined position on the support member 101b in FIG. 1, it may be set at a predetermined position on the support member 101a. Regardless of whether the vibration portion P is set on the support member 101a or the support member 101b, it is preferable to set the vibration portion P at a position where the accuracy of vibration measurement can be improved.
- the fixing members 102a and 102b fasten the pipeline 10 to the support members 101a and 101b.
- the fixing member (first fixing member) 102a fastens the pipeline 10 to the support member 101a at a position where one end A of the pipeline 10 protrudes from the support member 101a.
- the fixing member (second fixing member) 102b fastens the pipeline 10 to the support member 101b at a position where the other end B of the pipeline 10 protrudes from the support member 101b.
- the distance l 1 between one end A of the pipeline 10 and the support point X 1 is 20% or less of the distance L between the support point X 1 and the support point X 2 (l 1).
- the pipeline 10 is fastened to the support member 101a.
- the fixed member 102b, the distance l 2 between the other end B and the supporting point X 2 of the conduit 10 is 20% of the distance L between the supporting points X 1 and the support point X 2 or less (l 2 ⁇ 0.2L), the pipeline 10 is fastened to the support member 101b.
- the distance l 1 between one end A of the pipeline 10 and the support point X 1 is 20% or less of the distance L between the support point X 1 and the support point X 2 , and the other end B of the pipeline 10 and the support point.
- distance l 2 between the X 2 is at 20% or less, a position of a distance L between the supporting points X 1 and the support point X 2, the conduit 10, the fixed member 102a, 102b by the support members 101a, 101b In the vibration test device 100, it is possible to prevent the pipeline 10 from bending significantly to the outside of the fixing members 102a and 102b.
- the fixing member 102a includes, for example, a U-shaped bolt 1021a and a nut 1022a (see FIG. 4A).
- the fixing member 102b includes, for example, a U-shaped bolt 1021b and a nut 1022b (see FIGS. 4B and 4C).
- the U-shaped bolts 1021a and 1021b are one steel material having a curved central portion and a bolt structure at both ends.
- the U-shaped bolts 1021a and 1021b are attached to the support members 101a and 101b so as to sandwich the pipeline 10, and both ends thereof are inserted into the through holes H provided in the support members 101a and 101b.
- the nuts 1022a and 1022b have a structure in which the outer diameter is one size larger than the outer diameter of the through hole. Nuts 1022a, 1022b, the support member 101a, from the surface of the support surface Y 1, Y 2 and opposite in 101b, sandwiching the conduit 10 and the support member 101a, the 101b, U-bolt 1021a, screwed at both ends of 1021b To do. As a result, the pipeline 10 is fastened to the support members 101a and 101b by the fixing members 102a and 102b.
- the fixing member 102a includes the U-shaped bolt 1021a, the distance l 1 between one end A of the pipeline 10 and the support point X 1 is equal to or larger than the outer diameter ⁇ of the pipeline 10 (l 1 ⁇ ⁇ ). ), The pipeline 10 is fastened to the support member 101a.
- the fixing member 102b includes a U-shaped bolt 1021b
- the distance l 2 between the other end B of the pipeline 10 and the support point X 2 is equal to or greater than the outer diameter ⁇ of the pipeline 10 (l 2 ⁇ ).
- the pipeline 10 is fastened to the support member 101b.
- the pipe line 10 is fastened to the support members 101a and 101b by the fixing members 102a and 102b.
- the boundary conditions between the support members 101a and 101b and the fixing members 102a and 102b can be accurately matched with the boundary conditions between the pipeline and the bridge beam and the U-shaped bolt in the actual equipment.
- the distance l 1 between one end A of the pipeline 10 and the support point X 1 is smaller than the outer diameter ⁇ of the pipeline 10, and between the other end B of the pipeline 10 and the support point X 2.
- the pipeline 10 is fastened to the support members 101a and 101b by the fixing members 102a and 102b at a position where the distance l 2 is smaller than the outer diameter ⁇ of the pipeline 10, the pipeline 10 and the support members 101a and 101b And the boundary condition between the fixing members 102a and 102b becomes the boundary condition of the fixed support. In this case, it is not possible to reproduce the boundary conditions between the pipeline and the beam of the bridge and the U-shaped bolt in the actual equipment.
- a protective piece 107 bonded with an adhesive 106 may be provided between the pipeline 10 and the fixing members 102a and 102b.
- the protective piece 107 between the pipeline 10 and the fixing members 102a and 102b, the pipeline 10 is protected when the pipeline 10 is fastened to the support members 101a and 101b by the fixing members 102a and 102b. Can be done.
- the vibrating unit 103 applies a vibrating force to the support members 101a and 101b.
- the vibrating unit 103 may apply a vibrating force to a predetermined position on the support member 101a, or may apply a vibrating force to a predetermined position on the support member 101b.
- the vibrating unit 103 is, for example, a rubber hammer.
- an impact excitation force is applied to the vibration point P.
- the form of the vibrating portion 103 is not particularly limited, but by using a rubber hammer, it is possible to prevent the vibration test device 100 from being damaged, and the operator can deal with the support member 101a or the support member 101b. Therefore, the exciting force can be easily applied. Further, by using the vibrating portion 103 as a rubber hammer, it is possible to reduce the noise of the measured value.
- the vibrating unit 103 may include, for example, a sensor unit capable of wireless communication with the measuring unit 105.
- the sensor unit detects the exciting force applied to the support members 101a and 101b and outputs various data at the time of impact excitation to the measuring unit 105, so that the measuring unit 105 considers these data.
- the vibration characteristics of the pipeline 10 can be measured with higher accuracy.
- the detection unit 104 detects the vibration of the pipeline 10 and outputs the detection result to the measurement unit 105.
- the detection unit 104 is, for example, a contact type acceleration sensor, a non-contact type laser Doppler vibrometer, or the like. As shown in FIG. 1, when the detection unit 104 is an acceleration sensor, the acceleration sensor is provided in the central portion of the pipeline 10 and detects the vibration of the pipeline 10.
- the detection unit 104 is a laser Doppler vibrometer
- the laser Doppler vibrometer is provided at a predetermined distance (for example, 2 m) from the vibration test device 100, irradiates the central portion of the conduit 10 with a laser beam, and causes the Doppler vibrator. The frequency change of the shifted reflected laser light is converted into a voltage, and the vibration of the conduit 10 is detected.
- the measurement unit 105 measures the vibration characteristics of the pipeline 10 based on the detection result input from the detection unit 104.
- the measuring unit 105 is, for example, an FFT (Fast Fourier Transform) analyzer, and measures the natural frequency of the pipeline 10. As shown in FIG. 1, the measuring unit 105 may be connected not only to the detection unit 104 by wire but also to wirelessly communicate with the measuring unit 105.
- FFT Fast Fourier Transform
- the operator can grasp, for example, whether or not the pipeline 10 is safe against resonance with the bridge due to traffic vibration in the pipeline equipment. it can. That is, the operator grasps the information (vibration characteristics of the pipeline 10) acquired based on the vibration of the pipeline 10 reproduced by the vibration test device 100 before designing the actual equipment, and designs the pipeline equipment. It can be reflected.
- the distance l 1 between one end A of the pipeline 10 and the support point X 1 is 20% or less of the distance L between the support point X 1 and the support point X 2
- the pipeline 10 is fixed at a position where the distance l 2 between the other end B of the pipeline 10 and the support point X 2 is 20% or less of the distance L between the support point X 1 and the support point X 2.
- the members 102a and 102b are fastened to the support members 101a and 101b.
- the vibration test device 100 can appropriately change the measurement conditions such as the span length and the number of spans according to the form of the pipeline equipment. This allows the operator to carry out the desired verification without worrying about the restrictions on the specifications of the device.
- step S101 the support members 101a, 101b is joined to the wall 20 with a predetermined interval S, the support member 101a, in the supporting point X 1 of the support member 101a, to support the pipe 10, the support member 101b is in support point X 2 of the support member 101b, to support the pipe 10.
- step S102 the fixing members 102a and 102b fasten the pipeline 10 to the support members 101a and 101b.
- the distance l 1 between one end A of the pipeline 10 and the support point X 1 is 20% or less of the distance L between the support point X 1 and the support point X 2 (l 1 ⁇ 0.2 L).
- the pipeline 10 is fastened to the support member 101a.
- Fixing member 102b the distance l 2 between the other end B of the conduit 10 and the support point X 2 is, 20% of the distance L between the supporting points X 1 and the support point X 2 or less (l 2 ⁇ 0.2 L ),
- the pipeline 10 is fastened to the support member 101b.
- step S103 the vibrating unit 103 applies a vibrating force to the support members 101a and 101b.
- the operator hits the excitation point P with, for example, a rubber hammer, an impact excitation force is applied to the vibration point P.
- the vibrating portion 103 applies a vibrating force to the vibrating portion P, the support members 101a and 101b vibrate, and the vibrations of the support members 101a and 101b are transmitted to the pipeline 10.
- step S104 the detection unit 104 detects the vibration of the pipeline 10.
- the detection unit 104 is an acceleration sensor
- the acceleration sensor is provided in the central portion of the pipeline 10 and detects the vibration of the pipeline 10 over time.
- the measuring unit 105 measures the vibration characteristics of the pipeline 10.
- the measuring unit 105 is, for example, an FFT (Fast Fourier Transform) analyzer, and measures the natural frequency of the pipeline 10. From the experiment, it was found that particularly good results can be obtained when the pipe line 10 is a hard vinyl pipe having a nominal diameter of 75 mm.
- FFT Fast Fourier Transform
- the pipeline 10 is fastened to the support members 101a and 101b at the positions where the fixing members 102a and 102b are l 1 ⁇ 0.2 L and l 2 ⁇ 0.2 L.
- the fixing members 102a and 102b are l 1 ⁇ 0.2 L and l 2 ⁇ 0.2 L.
- the configuration in which the pipeline 10 is installed in the vibration test device 100 so as to be parallel to the ground has been described as an example, but the present invention is not limited to this.
- the pipeline 10 may be installed in the vibration test device 100 so as to be perpendicular to the ground.
- the vibration test device 100 is attached to the wall surface 20
- the vibration test device 100 may be mounted on the ceiling surface, for example.
- the configuration in which the vibration test device includes two support members 101 has been described as an example, but the number of support members 101 is not limited to this.
- the number of the support members 101 may be a plurality and may be 3 or more.
- the configuration in which the vibration test device includes two fixing members 102 has been described as an example, but the number of fixing members 102 is not limited to this.
- the number of the fixing members 102 may be a plurality and may be 3 or more.
- the configuration in which the detection unit 104 is a contact type acceleration sensor and a non-contact type laser Doppler vibrometer has been described as an example, but the detection unit 104 is not limited to this. ..
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Abstract
Description
図1乃至図4を参照して、本発明の一実施形態に係る振動試験装置100の構成について説明する。図4Aは、図1におけるI1-I1断面を示す図である。図4Bは、図1におけるI2-I2断面を示す図である。図4Cは、図1におけるI3-I3断面を示す図である。
次に、図5を参照して、本発明の一実施形態に係る振動試験方法について説明する。
20 壁面
100 振動試験装置
101a 支持部材(第1の支持部材)
101b 支持部材(第2の支持部材)
102a 固定部材(第1の固定部材)
102b 固定部材(第2の固定部材)
103 加振部
104 検出部
105 計測部
106 接着剤
107 保護片
1021 U字ボルト
1022 ナット
Claims (6)
- 構造物に添架された管路の振動を試験する振動試験装置であって、
所定の間隔を空けて壁面に接合され、前記管路を支持する複数の支持部材と、
前記管路の一端が第1の支持部材からはみ出す位置で、前記管路を前記第1の支持部材に締結する第1の固定部材と、
前記管路の他端が第2の支持部材からはみ出す位置で、前記管路を前記第2の支持部材に締結する第2の固定部材と、
前記支持部材に加振力を付与する加振部と、
前記管路の振動を検出する検出部と、
前記管路の振動特性を計測する計測部と、
を備える、振動試験装置。 - 前記管路の一端と、前記第1の支持部材が前記管路を支持する第1の支持点との間の距離、および、前記管路の他端と、前記第2の支持部材が前記管路を支持する第2の支持点との間の距離は、前記第1の支持点と前記第2の支持点との間の距離の20%以下である、
請求項1に記載の振動試験装置。 - 前記第1の固定部材および前記第2の固定部材は、U字ボルトと、ナットと、を備え、
前記管路の一端と、前記第1の支持部材が前記管路を支持する第1の支持点との間の距離、および、前記管路の他端と前記第2の支持部材が前記管路を支持する第2の支持点との間の距離は、前記管路の外径以上である、
請求項1又は2に記載の振動試験装置。 - 前記管路は、樹脂製又は金属製の管である、
請求項1から3のいずれか一項に記載の振動試験装置。 - 前記支持部材は、L形鋼、平鋼、又はH形鋼である、
請求項1から4のいずれか一項に記載の振動試験装置。 - 構造物に添架された管路の振動を試験する振動試験方法であって、
複数の支持部材が、所定の間隔を空けて壁面に接合され、前記管路を支持するステップと、
第1の固定部材が、前記管路の一端が第1の支持部材からはみ出す位置で、前記管路を前記第1の支持部材に締結するステップと、
第2の固定部材が、前記管路の他端が第2の支持部材からはみ出す位置で、前記管路を前記第2の支持部材に締結するステップと、
加振部が、前記支持部材に加振力を付与するステップと、
検出部が、前記管路の振動を検出するステップと、
計測部が、前記管路の振動特性を計測するステップと、
を含む、振動試験方法。
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US17/767,422 US20240102967A1 (en) | 2019-10-08 | 2019-10-08 | Vibration test device and vibration test method |
| JP2021550994A JP7397359B2 (ja) | 2019-10-08 | 2019-10-08 | 振動試験装置および振動試験方法 |
| PCT/JP2019/039722 WO2021070271A1 (ja) | 2019-10-08 | 2019-10-08 | 振動試験装置および振動試験方法 |
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| PCT/JP2019/039722 WO2021070271A1 (ja) | 2019-10-08 | 2019-10-08 | 振動試験装置および振動試験方法 |
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| WO2023218570A1 (ja) * | 2022-05-11 | 2023-11-16 | 日本電信電話株式会社 | 支援装置、支援方法およびプログラム |
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| CN113701962B (zh) * | 2021-07-29 | 2024-08-23 | 武汉船用机械有限责任公司 | 管道抗振密封性检测装置及检测方法 |
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| JP2012127674A (ja) * | 2010-12-13 | 2012-07-05 | Toray Ind Inc | 実験モーダル解析における振動データからのセンサ重量の影響除去方法 |
| JP3178808U (ja) * | 2012-07-11 | 2012-10-04 | 又一郎 萩尾 | 配管支持の補強材 |
| CN104297081A (zh) * | 2014-09-12 | 2015-01-21 | 大连理工大学 | 一种支承刚度可调节的液压管路振动试验装置 |
| JP2017053379A (ja) * | 2015-09-07 | 2017-03-16 | 特許機器株式会社 | 配管制振装置 |
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| US5929316A (en) * | 1997-07-22 | 1999-07-27 | King Design Industrial Co., Ltd. | Air hammer type impact tester |
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| NO334481B1 (no) * | 2009-01-30 | 2014-03-17 | Statoilhydro Asa | Fremgangsmåte og anordning for måling av tykkelse av en materialavsetning på en innervegg av en rørstruktur |
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- 2019-10-08 WO PCT/JP2019/039722 patent/WO2021070271A1/ja not_active Ceased
- 2019-10-08 US US17/767,422 patent/US20240102967A1/en not_active Abandoned
- 2019-10-08 JP JP2021550994A patent/JP7397359B2/ja active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023218570A1 (ja) * | 2022-05-11 | 2023-11-16 | 日本電信電話株式会社 | 支援装置、支援方法およびプログラム |
| JPWO2023218570A1 (ja) * | 2022-05-11 | 2023-11-16 | ||
| JP7751237B2 (ja) | 2022-05-11 | 2025-10-08 | Ntt株式会社 | 支援装置、支援方法およびプログラム |
Also Published As
| Publication number | Publication date |
|---|---|
| US20240102967A1 (en) | 2024-03-28 |
| JPWO2021070271A1 (ja) | 2021-04-15 |
| JP7397359B2 (ja) | 2023-12-13 |
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