Shock tube vibration and noise reduction performance improving device for engineering

Abstract

The invention relates to a shock tube vibration and noise reduction performance improving device for engineering, and belongs to the technical field of engineering anti-explosion tests. A shock tube of the device is coaxially connected with a fragment filtering module, a to-be-tested piece is arranged between the shock tube and the fragment filtering module, and the fragment filtering module is coaxially connected with a vibration and noise reduction performance improving module; high-pressure shock waves are emitted from the shock tube to crush a to-be-tested piece, and fragments of the to-be-tested piece and the decelerated shock waves are attenuated and dispersed after passing through the fragment filtering module and the vibration and noise reduction performance improving module. According to the shock tube vibration and noise reduction performance improving device for the engineering, vibration and noise reduction of the shock tube for the engineering under compressed air explosion are achieved, the shock tube vibration and noise reduction performance improving device can be used for vibration and noise control of a large indoor shock tube test, and operability is high.

Description

Technical Field

[0001] This invention relates to a device for improving the vibration reduction and noise reduction performance of shock tubes used in engineering, belonging to the field of engineering explosion-proof testing technology. Background Technology

[0002] Shock tubes are commonly used testing devices in the engineering blast resistance industry. They generate shock waves using compressed air and are widely used in the study of explosions and shock waves. Compared to vibrations and noise caused by environmental loads (trains, pedestrians, wind, etc.), the vibrations and noise caused by shock tubes are shorter in duration and higher in intensity, directly leading to pressure pulsations and mechanical vibrations within the shock tube body. Simultaneously, they also generate aerodynamic noise, severely restricting the indoor conduct of engineering blast resistance tests and causing harmful vibration and noise impacts on surrounding buildings. Currently, high-intensity shock wave tests are often conducted in open fields to minimize the impact of severe vibration and noise on the living environment. However, this method is usually labor-intensive and resource-intensive, affects the test schedule, and also has a certain impact on the surrounding natural ecology. Therefore, designing a shock tube vibration reduction and noise reduction performance enhancement device for engineering blast resistance tests will help solve the vibration and noise problems of shock tube testing, and is of great significance for optimizing shock tube testing methods and techniques and reducing the impact on the surrounding environment.

[0003] Currently, devices and methods for high-speed shock wave vibration reduction and noise reduction include: Patent No. 201910804803.5 discloses a multiphase flow supersonic noise reduction and rectification mechanism, which is composed of interconnected compensators, straight pipes, flexible joints, bends and noise-reducing check valves. It can realize the control of vibration and noise when the two-phase flow is mixed and transformed into a unidirectional flow. However, its whole structure is flexible and it is only aimed at the field of jet heat exchange technology.

[0004] Patent No. 201610381627.5 discloses a vibration damping silencer with radial and axial compensation functions. It reduces vibration and noise by installing a liquid storage-damper on one side of the outer corrugated pipe and communicating with the cavity. At the same time, it uses the limiting tie rod between the crossbeams to compensate for the axial and radial displacement of the pipeline. However, its application scope is mainly related to vibration and noise reduction of liquid pump outlet pipelines, and the liquid storage-damper may have the risk of leakage. None of the above test devices can improve the vibration and noise reduction performance when testing rigid specimens with shock tubes for engineering purposes, and they do not consider the convenience and replaceability of engineering use.

[0005] Patent No. 202111063622.5 discloses a combined vibration damping device, wherein the vertical vibration damping device includes a wire rope vibration damper and an elastic body, and the horizontal vibration damping device includes a moving rod and a steel spring. Through the combination of the two, the energy of multi-directional shock waves of large-tonnage equipment can be dissipated. However, its vibration damping components are expensive and need to be replaced frequently, making it difficult to use in engineering.

[0006] Patent No. 202310661840.1 discloses an adjustable vibration damping mechanism that uses the three-point spring tension balance principle to reduce vibration transmission through the extension and contraction deformation of the electrically controlled multi-linkage springs on the positioning seat. The vibration damping method is complex and it is not easy to achieve multi-linkage control operation. The above test devices do not consider the attenuation of severe aerodynamic noise caused by shock waves and the vibration damping components are expensive.

[0007] Patent No. 201710935525.8 discloses a leading edge design method for optimizing the wave system on the suction surface to suppress fan shock wave noise. By rapidly changing the shape of the leading edge and the suction surface, the interference between the wave system on the suction surface and the forward shock wave is improved, thereby reducing the fan shock wave noise. However, this method is complex to operate and difficult to apply to large-scale shock wave vibration reduction and noise reduction.

[0008] Patent No. 201710059429.1 discloses a rotor noise suppression method based on swept blade tip opening. By guiding the airflow at the leading edge of the blade to the end face of the blade tip, and then opening a hole on the swept blade tip to weaken the intensity of the blade tip vortex, the rotor blade-vortex interference noise is reduced. However, this method does not consider the vibration effect of high-speed shock waves and is not easy to be directly applied to tubular structures such as shock tubes.

[0009] Patent No. 202211394598.8 discloses a self-monitoring modular horizontal pump pipe vibration reduction and noise reduction device. Through the vibration reduction clamp components at both ends of the pump pipe and the main vibration measuring instrument set on the upper surface of the base plate, the device achieves overall vibration reduction and noise reduction as well as self-monitoring modular design. However, the device has a single vibration reduction method and is not suitable for vibration reduction and noise reduction of ultra-high speed shock tubes.

[0010] Patent No. 202211198339.8 discloses a ring-shaped spiral acoustic black hole vibration reduction structure, which includes a central ring made of high temperature resistant material, multiple Archimedes spiral acoustic black holes and a ring band. It can achieve customized attenuation of vibration and noise of tubular structures, but cannot consider the filtering problem of fragments after shock wave impact damages the test piece. Summary of the Invention

[0011] To reduce the vibration and noise of engineering shock tubes under compressed air explosions and avoid damage to the vibration and noise reduction performance enhancement module, this invention provides a device for improving the vibration and noise reduction performance of engineering shock tubes.

[0012] The present invention adopts the following technical solution:

[0013] The present invention provides an engineering shock tube vibration reduction and noise reduction performance improvement device, which includes a shock tube, a debris filtering module, and a vibration reduction and noise reduction performance improvement module.

[0014] The shock tube is coaxially connected to the debris filtering module, and the test piece is placed between the shock tube and the debris filtering module. The debris filtering module is coaxially connected to the vibration reduction and noise reduction performance improvement module.

[0015] High-pressure shock waves are emitted from the shock tube, shattering the test piece. The fragments of the test piece and the decelerated shock waves are attenuated and dispersed after passing through the fragment filtering module and the vibration reduction and noise reduction performance enhancement module.

[0016] The shock tube vibration reduction and noise reduction performance improvement device for engineering applications described in this invention includes a debris filtering module comprising a filter tube body adapted to the shock tube, wherein a plurality of circular perforated grid plates are coaxially arranged on the filter tube body; each circular perforated grid plate is provided with a plurality of circular holes, and the circular holes between adjacent circular perforated grid plates are non-coaxially arranged.

[0017] The shock tube vibration reduction and noise reduction performance improvement device for engineering applications described in this invention has the same radius as the filter tube of the debris filtering module, and the shock tube and the debris filtering module are connected by a flange; the flange at the connection between the shock tube and the debris filtering module clamps the test piece.

[0018] The vibration reduction and noise reduction performance enhancement device for engineering shock tubes according to the present invention includes a coarse perforation, a ribbed wave-damping device, and a module tube body.

[0019] Multiple rib-shaped corrugated devices are arranged along the inner wall of the module tube, and the rib-shaped corrugated devices are arranged in a periodic circle along the inner wall of the module tube.

[0020] The coarse cloth holes are arranged in a periodic manner around the tube body of the module, and the coarse cloth holes are located between multiple rib-shaped corrugated devices.

[0021] The shock tube vibration reduction and noise reduction performance improvement device for engineering use described in this invention has at least four sub-wave baffles arranged in each periodic plane layer of the rib-shaped wave baffle device, and a cross-shaped airflow channel is formed between the four sub-wave baffles.

[0022] The shock tube vibration reduction and noise reduction performance improvement device for engineering applications described in this invention has at least four circular perforated grid baffles located in the debris filtering module. Each circular perforated grid baffle has two circular holes, which are arranged horizontally, vertically, at a 45° angle to the horizontal, or at a 135° angle to the horizontal.

[0023] The shock tube vibration reduction and noise reduction performance improvement device for engineering applications described in this invention has a circular hole diameter on the circular perforated grid plate that is smaller than the radius of the circular perforated grid plate.

[0024] Beneficial effects

[0025] This invention provides a vibration and noise reduction performance enhancement device for engineering shock tubes, which reduces vibration and noise of engineering shock tubes under compressed air explosions. It can be used for vibration and noise control in large-scale indoor shock tube tests and is highly operable. The method for adjusting test parameters such as frequency, amplitude, and direction of vibration and noise caused by different high-speed shock waves is simple and has a wide range of applications. The debris generated after the test specimen is penetrated by the shock wave can be filtered to avoid damage to the vibration and noise reduction performance enhancement module, making it highly practical. It is composed of a traditional engineering shock tube, a debris filtering device, and a simple vibration and noise reduction device, which is inexpensive and has good economic benefits. All components are detachable, making it easy to install and replace test specimens. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the shock tube vibration reduction and noise reduction performance improvement device for engineering applications of the present invention;

[0027] Figure 2 yes Figure 1 Schematic diagram of AA profile results;

[0028] Figure 3 This is a three-dimensional structural schematic diagram of the shock tube vibration reduction and noise reduction performance improvement device for engineering applications according to the present invention;

[0029] Figure 4 This is a side view of the shock tube vibration reduction and noise reduction performance improvement device for engineering applications of the present invention;

[0030] Where (a) is the left view and (b) is the right view;

[0031] Figure 5 This is a schematic diagram of the overall structure of the debris filtering module of the shock tube vibration reduction and noise reduction performance improvement device for engineering applications of the present invention;

[0032] (a) is the EE section view, (b) is the FF section view, (c) is the GG section view, (d) is the HH section view, and (e) is the II section view.

[0033] Figure 6 This is a schematic diagram of the overall structure of the vibration reduction and noise reduction performance enhancement module of the shock tube vibration reduction and noise reduction performance enhancement device for engineering applications of the present invention;

[0034] Where (a) is the left view, (b) is the right view, (c) is the CC section view, (d) is the BB section view, and (e) is the DD section view;

[0035] Figure 7 This is a schematic diagram of the overall connection structure of the present invention. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Reference Figures 1 to 7 The shock tube vibration reduction and noise reduction performance improvement device for engineering applications described in this invention mainly includes: shock tube 1, debris filtering module 6, and vibration reduction and noise reduction performance improvement module 11; the materials of this device are all high-strength steel.

[0038] The right end of the shock tube 1 is coaxially fixed to the right end flange 2; the two ends of the debris filtering module 6 are coaxially fixed to the left end flange 4 and the right end flange 7 respectively; the left end of the vibration reduction and noise reduction performance improvement module 11 is fixed to the flange 8.

[0039] The right flange 2 of the shock tube 1 is connected to the left flange 4 of the debris filtering module 6 using high-strength bolts. The right flange 7 of the debris filtering module 6 is also connected to the left flange 8 of the vibration reduction and noise reduction performance improvement module 11 using high-strength bolts. Bolt gaskets are present between the high-strength bolts.

[0040] The shock tube 1 and the debris filter module 6 have the same tube radius. The test piece 3 is sandwiched between the right flange 2 of the shock tube 1 and the left flange 4 of the debris filter module 6. The right flange 2 of the shock tube 1, the left flange 4 of the debris filter module 6, and the test piece 3 are tightly connected by high-strength bolts, and each layer of the connection contains a thin rubber pad.

[0041] The debris filtering module 6 has four layers of circular perforated grid plates 5 inside, and the grid plates 5 are welded to the tube body of the debris filtering module 6.

[0042] The vibration reduction and noise reduction performance enhancement module 11 contains periodically arranged rib-shaped corrugated devices 10 and periodically surrounding coarse perforated holes 9. The rib-shaped corrugated devices 10 are arranged in a matrix and coaxially welded to the inner wall of the vibration reduction and noise reduction performance enhancement module 11 tube. The periodically surrounding coarse perforated holes 9 are coaxially arranged and uniformly arranged on the tube of the vibration reduction and noise reduction performance enhancement module 11 tube. The rib-shaped corrugated devices 10 and the tube of the vibration reduction and noise reduction performance enhancement module 11 are connected by welding. The periodically surrounding coarse perforated holes are introduced on the tube of the vibration reduction and noise reduction performance enhancement module 11 to achieve secondary adjustment of acoustic impedance.

[0043] In use, the high-pressure shock wave generated by the shock tube 1 impacts the test specimen 3. The fragments generated by the test specimen 3 and the decelerated shock wave pass through the fragment filtering module 6, which can quickly filter the test fragments. When the decelerated shock wave passes through the vibration reduction and noise reduction performance enhancement module 11, the rib-shaped wave baffle device 10 can quickly attenuate the shock wave velocity and quickly disperse the energy. Then, after passing through the periodically surrounding coarse cloth hole 9, it triggers the periodic concentration effect of fluid vibration, thereby achieving a larger range of vibration reduction and an increase in acoustic impedance, thus achieving the effect of improving vibration reduction and noise reduction performance.

[0044] The right flange 2 of the shock tube 1, the left flange 4 and right flange 7 of the debris filtering module 6, and the left flange 8 of the vibration reduction and noise reduction performance improvement module 11 are each provided with 10 set bolt threaded through holes 21. The connection method is to use high-strength bolts to connect through the threaded through holes 21. There is a bolt pad between the high-strength bolt and the set bolt threaded through hole 21. A hydraulic mechanical wrench is used to achieve a high-strength and tight connection, which makes the invention more widely used.

[0045] The first layer of double holes 51 of the circular perforated grid 5 inside the debris filtering module 6 is placed horizontally, the second layer of double holes 52 is arranged vertically, the third layer of double holes 53 is arranged at a 135° angle to the horizontal, and the fourth layer of double holes 54 is arranged at a 45° angle to the horizontal. Each grid is arranged periodically inside the debris filtering module 6.

[0046] The circular perforated grid 5 is made of high-strength steel. The diameter of its circular holes is no more than 1 / 3 of the diameter of the circular perforated grid 5, and it should not be too small. Its advantage is that the device is simple and feasible, and the impact fragments of the test specimen 3 can be quickly filtered by adjusting the diameter of the circular holes, so as to avoid damage to the vibration reduction and noise reduction performance improvement module 11. It is more suitable for high-pressure pipelines and variable load conditions, and replacement is also relatively simple.

[0047] The vibration reduction and noise reduction performance enhancement module tube body 11 is equipped with a periodically spaced, matrix-surrounded rib-shaped wave-damping device 10. The rib-shaped wave-damping device 10 is periodically arranged around the inner wall of the tube body of the vibration reduction and noise reduction performance enhancement module 11 and is connected by welding. Each period of the rib-shaped wave-damping device 10 is provided with 4 sub-wave-damping devices 101 of the same size in each plane layer. By blocking the shock wave and slowing it down, the aerodynamic noise is reduced, and rapid vibration reduction and noise reduction are achieved.

[0048] The tube body 11 of the vibration reduction and noise reduction performance enhancement module is provided with several periodic surrounding coarse holes 9. By adjusting the hole size and arrangement, the acoustic impedance of the Helmholtz resonator can be adjusted, and the periodic accumulation effect of fluid vibration can be triggered to achieve the control of the resonant frequency and the increase of acoustic impedance.

[0049] Further optimization of the scheme: the sub-wave baffle device 101 adopts an edge ribbed fan shape approximately "L" shaped. The width of the rib can be approximately confirmed according to the impact wavelength and wave velocity. Considering safety requirements, it is not less than twice the thickness of the ribbed wave baffle device 10.

[0050] The periodically surrounding roughened holes 9 are circular, arranged coaxially and uniformly along the circumference of the vibration reduction and noise reduction performance enhancement module tube. Twenty-four identical circular holes 91 are arranged along the circumference of the periodically surrounding roughened holes 9. Each hole 91 is divided into two sections: one cylindrical near the inner wall of the vibration reduction and noise reduction performance enhancement module tube 11, and the other frustum-shaped near the outer wall of the tube 11. By selectively inserting variable cross-section flat-head bolts into the holes 91, the arrangement of the periodically surrounding roughened holes 9 can be quickly changed, thereby enabling easy adjustment of the shock wave resonance frequency.

[0051] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A device for improving the vibration and noise reduction performance of an engineering shock tube, comprising a shock tube (1), characterized in that: The debris filtering module (6) and the shock wave tube (1) are coaxially connected, and the test piece (3) is arranged between the shock wave tube (1) and the debris filtering module (6); the debris filtering module (6) and the vibration and noise reduction performance improvement module (11) are coaxially connected. The high-pressure shock wave is emitted from the shock wave tube (1) to break the test piece (3), and the debris of the test piece (3) and the decelerated shock wave are attenuated and dispersed after passing through the debris filtering module (6) and the vibration and noise reduction performance improvement module (11). The debris filtering module (6) comprises a filtering pipe body matched with the shock wave tube (1), and a plurality of circular hole grid baffles (5) are arranged coaxially in the filtering pipe body; a plurality of circular holes are formed in each circular hole grid baffle (5), and the circular holes between adjacent circular hole grid baffles (5) are arranged in a non-coaxial manner.

2. The device for improving the shock tube vibration and noise reduction performance for engineering according to claim 1, characterized in that: The radius of the filtering pipe body of the debris filtering module (6) is consistent with that of the shock wave tube (1), and the shock wave tube (1) and the debris filtering module (6) are connected through flanges; the test piece (3) is clamped between the flanges at the joint of the shock wave tube (1) and the debris filtering module (6).

3. The device for improving the shock tube vibration and noise reduction performance for engineering according to claim 2, characterized in that: The vibration and noise reduction performance improvement module (11) comprises a rough hole (9), a rib wave blocking device (10), and a module pipe body (11).

4. The device for improving the shock tube vibration and noise reduction performance for engineering according to claim 1, characterized in that: A plurality of rib wave blocking devices (10) are arranged along the inner wall of the module pipe body (11), and the rib wave blocking devices (10) are arranged in a periodic ring around the inner wall of the module pipe body (11). The rough hole (9) is arranged in a periodic ring around the pipe body (11), and the rough hole (9) is located between the plurality of rib wave blocking devices (10). Each periodic plane layer of the rib wave blocking device (10) is provided with at least four sub-wave blocking devices (101), and the four sub-wave blocking devices (101) form a cross-shaped airflow channel.

5. The device for improving the shock tube vibration and noise reduction performance for engineering according to claim 4, characterized in that: The circular hole grid baffle (5) in the debris filtering module (6) is at least four, each of the circular hole grid baffles (5) is provided with two circular holes, and the two circular holes are arranged horizontally, vertically, at an angle of 45° with the horizontal, or at an angle of 135° with the horizontal.

6. The device for improving the shock tube vibration and noise reduction performance for engineering according to claim 2, characterized in that: The diameter of the circular hole on the circular hole grid baffle (5) is smaller than the radius of the circular hole grid baffle (5).

7. The device for improving the shock tube vibration and noise reduction performance for engineering according to claim 2 or 6, characterized in that: ​

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