Multi-degree-of-freedom abnormal sound test bench

Abstract

The invention provides a multi-degree-of-freedom abnormal sound test bench. The multi-degree-of-freedom abnormal sound test bench comprises a base, a test bench, a transmission mechanism and a power device, the transmission mechanism comprises two transmission sets, each transmission set comprises a first transmission part, a second transmission part and a plurality of connecting rods, and each first transmission part comprises a first support capable of swinging in the x direction, a second support capable of swinging in the z direction and a driving support connected with the first hinge part and driven by the power device. The second transmission part comprises a second hinge part which is movably hinged to the base and is limited in the x direction, a third bracket capable of swinging in the z direction and a fourth bracket capable of swinging in the y direction; the first support and the second support can be connected with the testboard through connecting rods, and the third support and the fourth support can be connected with the second support and the testboard through connecting rods respectively. According to the invention, multi-degree-of-freedom simulation of the test bench can be realized through the two power devices, the functions are comprehensive, and the abnormal sound test accuracy is high.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle performance detection, and in particular to a multi-degree-of-freedom abnormal noise test bench. Background Art

[0002] In recent years, abnormal noises in cars have attracted more and more attention. As we all know, cars are assembled from several parts, and abnormal noises in parts are an important part of the entire abnormal noise of cars. Nowadays, major parts and car manufacturers pay great attention to the abnormal noises of parts, and usually use test methods to determine whether parts have abnormal noises.

[0003] Road vibrations cause various noises (buzz, squeak, rattle, etc.) in the car. These noises come from some subsystems of the car such as the cockpit, seats, doors, console, ceiling, HVAC, steering system and many components such as seat belt retractors, audio / entertainment / navigation equipment, sun visors, etc. There are more than 1,000 contact points between these interior subsystems and components, and these contact points may cause friction or impact noises.

[0004] The test bench used to test the abnormal noise and performance risks of parts is called the abnormal noise vibration test bench system of parts. The test bench is required to have various degrees of freedom to simulate the movement of real vehicles. In order to achieve multi-degree-of-freedom simulation, power sources from multiple directions are required. The patent document with patent application number CN202410080685.9 discloses a vehicle abnormal noise detection platform, including a static platform, a dynamic platform and four branch motion chains. There are three hydraulic motors and a hydraulic cylinder on the four branch motion chains. Four power mechanisms are used to control the four branch motion chains in different motion states, thereby simulating various degrees of freedom of vehicle movement. In order to provide power sources from multiple directions, the above technical solution has a large number of power mechanisms, and the system control during operation is relatively complex, which affects the operating accuracy of the equipment. In addition, the operation of the test bench relies on a large number of articulated structures. On the one hand, it is easy to generate noise interference and affect the test accuracy. On the other hand, the active parts wear faster and the equipment maintenance cost is higher. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a multi-degree-of-freedom abnormal sound test bench, which can provide power sources in x, y, and z directions through two power devices and corresponding transmission mechanisms, and can realize multi-degree-of-freedom simulation by changing the connection method of the transmission mechanism.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A multi-degree-of-freedom abnormal sound test bench, comprising a base, a test bench, a transmission mechanism and a power device; the test bench comprises two x-direction side surfaces, two y-direction side surfaces and two z-direction side surfaces, wherein one x-direction side surface is provided with two first docking portions, the two y-direction side surfaces are each provided with a second docking portion, and the z-direction side surface located relatively to the lower side is provided with two third docking portions; the transmission mechanism comprises two transmission groups, each transmission group comprises a first transmission member, a second transmission member and a plurality of connecting rods, the first transmission member comprises a first hinged portion movably hinged to the base and limited in the y direction, a first bracket that can swing in the x direction, a second bracket that can swing in the z direction and a driving bracket that can be connected to the power device; the second transmission member comprises a second hinged portion movably hinged to the base and limited in the x direction, a third bracket that can swing in the z direction and a fourth bracket that can swing in the y direction; the first bracket and the second bracket can be connected to a first docking portion and a third docking portion respectively through the connecting rod, and the third bracket and the fourth bracket can be connected to the second bracket and a second docking portion respectively through the connecting rod.

[0007] The "y-direction" limit means that after the first hinged part of the first transmission member is movably hinged to the base, it can only move in the xz plane and cannot move in the y direction; the "x-direction limit" means that after the second hinged part of the second transmission member is movably hinged to the base, it can only move in the yz plane and cannot move in the x direction.

[0008] Furthermore, the test bench is provided with a connecting block at each junction of the x-direction side surface and the y-direction side surface, the base includes a mounting base block and a limit member, the limit member includes connecting parts located at both ends and a limit spring located in the middle, the connecting block and the mounting base block form a first mounting position that can be detachably connected to the two ends of the limit member and make the limit spring parallel to the x-direction side surface, a second mounting position that can be detachably connected to the two ends of the limit member and make the limit spring parallel to the y-direction side surface, and a third mounting position that can be detachably connected to the two ends of the limit member and make the limit spring parallel to the z-direction side surface.

[0009] Further, the first mounting position includes a first connecting surface located on the connecting block and a first mounting surface located on the mounting base block, the first connecting surface is perpendicular to the yz plane, and the first mounting surface is parallel to the yz plane; the second mounting position includes a second connecting surface located on the connecting block and a second mounting surface located on the mounting base block, the second connecting surface is perpendicular to the xz plane, and the second mounting surface is parallel to the xz plane; the third mounting position consists of a third connecting surface located on the connecting block and a third mounting surface located on the mounting base block, the third connecting surface is perpendicular to the xy plane, and the third mounting surface is parallel to the xy plane; the two ends of the limiting member respectively form a first connecting end and a second connecting end, the first connecting end has a first connecting hole whose opening direction is parallel to the limiting spring piece, and the second connecting end has a second connecting hole whose opening direction is perpendicular to the limiting spring piece.

[0010] Furthermore, the first connecting surface forms an angle of 45° with the xz plane, the second connecting surface forms an angle of 45° with the xy plane, and the third connecting surface forms an angle of 45° with the yz plane.

[0011] Furthermore, the end of the first bracket forms an x-direction terminal with an x-direction connection hole, the end of the second bracket forms a first z-direction terminal with a z-direction connection hole, the end of the third bracket forms a second z-direction terminal with a z-direction connection hole, and the end of the fourth bracket forms a y-direction terminal with a y-direction connection hole.

[0012] Furthermore, the end of the first bracket forms a first branch and a second branch arranged vertically, the first branch and the second branch form an angle, the end of the first branch is provided with an upper connecting terminal corresponding to the third docking portion, and the end of the second branch is provided with a lower connecting terminal corresponding to the third bracket.

[0013] Furthermore, the base includes a bottom plate, a support frame vertically connected to the bottom plate, and a support platform connected to the upper end of the support frame. The upper side surface of the bottom plate is provided with a first / second mounting frame that can be movably hinged to the first / second hinged part, and the mounting base block is fixed to the upper side surface of the support platform.

[0014] Furthermore, the upper side surface of the support platform is provided with a supporting airbag or an airbag reserved portion for installing the supporting airbag, and the supporting airbag or the airbag reserved portion, and the z-direction side surface of the test platform relatively located at the lower side is provided with an airbag positioning portion corresponding to the position of the supporting airbag or the airbag reserved portion.

[0015] Furthermore, the upper side surface of the support platform is provided with a balance bar extending along the y-direction or a balance bar reserved portion for installing the balance bar, and the z-direction side surface of the test platform relatively located at the lower side is provided with a balance bar positioning portion corresponding to the end of the balance bar or the position of the balance bar reserved portion.

[0016] Furthermore, the abnormal sound test bench also includes a limit arm and a mounting seat, the limit arm includes a Y-shaped connection between a first connecting arm, a second connecting arm and a third connecting arm, the end of the first connecting arm is connected to the mounting seat, and an x-direction side surface of the test bench is connected to the ends of the first connecting arm and the second connecting arm or is provided with a connecting arm reserved portion that can be connected to the ends of the first connecting arm and the second connecting arm.

[0017] In summary, the application of the present invention can achieve the following beneficial effects: 1. The present invention drives the first transmission member through a power device. When the connection relationship between the first transmission member and the test bench and the second transmission member is changed, the test bench can be vibrated along the x, y, and z directions respectively. That is, the multi-degree-of-freedom simulation of the test bench can be achieved by only two power devices. The structure is compact and easy to operate.

[0018] 2. The present invention transmits power through the first transmission member and the second transmission member. Compared with the kinematic chain in the prior art, the present invention reduces the setting of the hinge structure, and the working performance of the transmission mechanism is more stable and the service life is longer.

[0019] 3. The present invention can achieve simulation of multiple composite degrees of freedom and improve the effect of abnormal sound testing by changing the connection relationship between the first transmission member, the second transmission member and the test bench and the operation process of the two transmission groups.

[0020] 4. In some embodiments of the present invention, a connecting block, a mounting base block and a limit member are provided. The limit member has different limiting effects in three different mounting positions, respectively, so that the test bench can switch between three modes of vibration only in the x-direction, vibration only in the y-direction and vibration only in the z-direction, thereby avoiding motion errors during the degree of freedom simulation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the abnormal noise test bench in the embodiment; Figure 2 for Figure 1 The front view of the test bench; Figure 3 for Figure 1 A schematic diagram of the structure of the first transmission member and the second transmission member; Figure 4 for Figure 1 A schematic diagram of the structure of the middle connecting block and the mounting base block; Figure 5 for Figure 1 A schematic diagram of the structure of the middle limiter; Figure 6 It is a schematic diagram of the structure of the limiter in three installation positions; Figure 7 It is a structural schematic diagram of an abnormal noise test bench in another embodiment; Figure 8 It is a structural schematic diagram of an abnormal noise test bench in another embodiment; Fig. 9 It is a structural schematic diagram of an abnormal noise test bench in another embodiment; In the figure: 1-base, 11-bottom plate, 12-support frame, 13-support platform, 14-mounting base block, 141-first mounting surface, 142-second mounting surface, 143-third mounting surface, 15-limiting member, 151-first connecting end, 152-second connecting end, 153-limiting spring piece, 16-first mounting frame, 17-second mounting frame; 2-test bench, 21a-x side, 21b-y side, 21c-z side, 22-first docking portion, 23-second docking portion, 24-third docking portion, 25-connecting block, 251-first connecting surface, 252-second connecting surface, 253-third connecting surface; 3-transmission mechanism, 31-first transmission member, 311-first hinged portion, 312-first bracket, 3121-x-direction end, 313-second bracket, 3131-upper connecting end, 3132-lower connecting end, 314-driving bracket, 32-second transmission member, 321-second hinged portion, 322-third bracket, 3221-second z-direction end, 323-fourth bracket, 3231-y-direction end, 33-connecting rod; 4- Power plant; 5-Support airbag; 6-balance bar, 61-base connection part, 62-test bench connection part; 7-limiting arm, 71-first connecting arm, 72-second connecting arm, 73-third connecting arm. DETAILED DESCRIPTION

[0022] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that the x-direction, y-direction and z-direction described in the present invention are based on a three-dimensional rectangular coordinate system, and the x-direction, y-direction and z-direction are perpendicular to each other. The description of the x-direction, y-direction and z-direction in the present invention is only used to indicate the relative position relationship between different technical features, and does not limit the absolute position of the technical features. Example

[0024] Reference Figures 1 to 6 The embodiment of the first aspect of the present invention provides a multi-degree-of-freedom abnormal sound test bench, which includes a base 1, a test bench 2, a transmission mechanism 3 and a power device 4, specifically: The base comprises a bottom plate 11, a support frame 12, a support platform 13, an installation base block 14 and a limiter 15; the bottom plate 11 is horizontally fixed on the foundation when in use, the support frame 12 is vertically connected to the side surface of the bottom plate and has an overhead effect, the support platform 13 is connected to the upper end of the support frame and is horizontally arranged when in use, the installation base block 14 is fixedly connected to the upper side surface of the support platform, and the limiter 15 can form a detachable connection with the installation base block; there are two support platforms 13, and the two support platforms are symmetrically arranged in the xz plane, and two support frames 12 are provided at the bottom of each support platform; there are four installation base blocks 14, and two installation base blocks are fixed on the side surface of each support platform, and the installation base blocks on the two support platforms The mounting block is symmetrically arranged in the xz plane, and the mounting block has a first mounting surface 141 parallel to the yz plane, a second mounting surface 142 parallel to the xz plane, and a third mounting surface 143 parallel to the xy plane. The first mounting surface, the second mounting surface, and the third mounting surface are all provided with a limiting member mounting hole; the two ends of the limiting member 15 respectively form a first connecting end 151 and a second connecting end 152, and a limiting spring sheet is provided in the middle. The first connecting end is provided with a first connecting hole whose opening direction is parallel to the limiting spring sheet, and the second connecting end is provided with a second connecting hole whose opening direction is perpendicular to the limiting spring sheet. The second connecting end can be fixed to the first mounting surface, the second mounting surface, or the third mounting surface through the second connecting hole; The test bench 2 has two x-direction side surfaces 21a with the x-direction as the normal, two y-direction side surfaces 21b with the y-direction as the normal, and two z-direction side surfaces 21c with the z-direction as the normal. Two first docking portions 22 are connected to one of the x-direction side surfaces 21a, and a second docking portion 23 is connected to each of the two y-direction side surfaces 21b. When in use, two third docking portions 24 are connected to a z-direction side surface close to the lower side, wherein the first docking portion has a first docking hole with an opening direction in the x-direction, the second docking portion has a second docking hole with an opening direction in the y-direction, and the third docking portion has a third docking hole with an opening direction in the z-direction. The test bench is provided with a connecting block 25 at each of the four corners formed by the x-direction side surfaces and the y-direction side surfaces, and the connecting block comprises a first connecting surface 251 perpendicular to the yz plane, a second connecting surface 252 perpendicular to the xz plane, and a third connecting surface 253 perpendicular to the xy plane; refer to Figures 4 to 6, when the two ends of the limit member are respectively connected to the first connecting surface 251 and the first mounting surface 141, that is, when the limit member is in the first mounting position 15a, the normal direction of the limit spring is the x direction. Due to the limitation of the physical structure, the limit spring can only bend in the x direction. At this time, the limit member can make the test bench vibrate only in the x direction. Similarly, when the two ends of the limit member are respectively connected to the second connecting surface 252 and the second mounting surface 142, that is, when the limit member is in the second mounting position 15b, the test bench can only vibrate in the y direction. When the two ends of the limit member are respectively connected to When the first connection surface and the third installation surface are reached, that is, when the limiter is in the third installation position 15c, the test bench can only vibrate in the z direction, thereby reducing or eliminating the interference of the test bench moving in a non-preset direction during the abnormal sound test, so that the detection result is more accurate; further, the first connection surface forms an angle of 45° with the xz plane, the second connection surface forms an angle of 45° with the xy plane, and the third connection surface forms an angle of 45° with the yz plane. The above angle setting can make the first docking hole and the second docking hole easy to operate when the limiter is installed; The power mechanism includes two transmission groups, each of which includes a first transmission member 31, a second transmission member 32 and a connecting rod 33. The first transmission member 31 includes a first hinged portion 311 located in the middle and a first bracket 312, a second bracket 313 and a driving bracket 314 extending in different directions and connected to the first hinged portion. The first hinged portion 311 is hinged to a first mounting frame 16 arranged on the upper side of the base plate 11, so that the first transmission member can swing based on the first mounting frame. The first bracket 312 extends approximately in the z direction to a height corresponding to the first docking portion 22. The end of the first transmission member forms an x-direction terminal with an x-direction connection hole. The connecting rod can connect the first bracket to the x-direction side 21a through the x-direction terminal and the first docking portion, so that the first bracket can apply an x-direction exciting force to the test bench. The second bracket 313 extends approximately in the x direction to a position corresponding to the third docking portion 24. The end of the second bracket forms a first z-direction terminal with a z-direction opening. More specifically, the end of the second bracket forms an upper and lower Two branches, an upper connecting end 3131 is formed at the end of the first branch located on the upper side, and a lower connecting end 3132 is formed at the second branch located on the lower side. The connecting rod can connect the second bracket to the z-direction side 21c through the upper connecting end and the third docking portion, so that the second bracket can apply z-direction exciting force to the test bench; the end of the driving bracket 314 can be connected to the power device 4 to introduce power to the entire power mechanism; the second transmission member 32 includes a second hinged portion 321 located in the middle and a third bracket 322 and a fourth bracket 323 connected to the second hinged portion 321 and extending in different directions, the end of the third bracket 322 forms a second z-direction end with a z-direction opening, the second z-direction end can be connected to the lower connecting end through the connecting rod, the end of the fourth bracket 323 forms a y-direction end 3231 with a y-direction opening, the connecting rod can connect the fourth bracket to the y-direction side 21b through the y-direction end and the second docking portion 23, so that the fourth bracket can apply y-direction exciting force to the test bench; The working principle of this embodiment is as follows: when it is necessary to apply an exciting force in the x-direction, the first bracket is connected to the test bench through a connecting rod, and the limiting member is fixed at the first installation position, and the driving bracket is driven to move by the power device, so that the first bracket can apply an exciting force in the x-direction to the test bench; when it is necessary to apply an exciting force in the z-direction, the second bracket is connected to the test bench through a connecting rod, and the limiting member is fixed at the third installation position, and the driving bracket is driven to move by the power device, so that the second bracket can apply an exciting force in the z-direction to the test bench; when it is necessary to apply an exciting force in the y-direction, the fourth bracket is connected to the test bench through the connecting rod, and the third bracket is connected to the second bracket through the connecting rod, and the driving bracket is driven to move by the power device, so that the fourth bracket can apply an exciting force in the z-direction to the test bench.

[0025] In addition, since the present invention includes two transmission groups, the power devices connected to each of the two transmission groups can receive different motion instructions, thereby achieving some complex motion effects, for example: the second brackets of the first transmission group and the second transmission group are both connected to the test bench, and the movement directions of the first transmission group and the second transmission group are opposite, that is, when the first motion group lifts up the left half of the test bench facing upward, the second motion group pulls down the right half of the test bench facing upward. In this state, the test bench will swing, thereby achieving complex degree of freedom testing other than x, y, and z.

[0026] Reference Figure 7 In some embodiments of the present invention, the base also includes a supporting airbag 5 arranged on the upper side of the support platform, and the supporting airbag 5 is used to support the test bench before the limiter is fixed and installed, and adjust the test bench to a suitable height to facilitate the fixation of the limiter; the support platform is provided with four airbag reserved parts for installing supporting airbags, and the airbag reserved parts are arranged at positions close to the installation base block. When performing single-direction vibration tests in the x, y or z directions, the four airbag reserved parts are all installed with supporting airbags, so that the test bench is subjected to uniform support force to facilitate the fixation of the limiter at the four corners; the supporting airbag 5 is detachably connected to the support platform to meet the requirements of different test scenarios.

[0027] Reference Figure 8 In some embodiments of the present invention, the base also includes a balance bar 6 arranged on the upper side of the support platform, the balance bar is arranged across the two support platforms along the y direction, and the two ends of the balance bar are respectively provided with a base connection part 61 and a test platform connection part 62, the base connection part is fixedly connected to the support platform below, and the test platform connection part is connected to the test platform above, the balance bar is limited and fixed so that its axis can only maintain the y direction, at least a part of the balance bar can rotate around the axis, so that after the test platform is connected to the balance bar, the test platform can rotate based on the axis of the balance bar, the balance bar is arranged at a position close to the x-direction side of one side of the test platform, when the test platform is subjected to an exciting force including a z-direction, the test platform will pitch and tilt, thereby realizing a composite degree of freedom test other than x, y, and z; during the above test, since the movement direction of the test platform is not a single direction, the limiter is not installed during the test process, and two support airbags are arranged on the upper side of the support platform at a position away from the balance bar, and the support airbags are used to provide support force before the transmission mechanism is connected.

[0028] Reference Fig. 9In some embodiments of the present invention, the abnormal sound test bench also includes a limit arm 7 and a mounting seat, and the mounting seat is fixed on a horizontal foundation when in use, and the limit arm includes a first connecting arm 71, a second connecting arm 73 and a third connecting arm 74 connected in a Y-shaped structure, and the first connecting arm is movably connected to the mounting seat so that the first connecting arm can rotate on the xy plane based on the mounting seat, and a connecting arm reserved portion that can be connected to the second connecting arm and the third connecting arm is provided on an x-side surface of the test bench. When the second connecting arm and the third connecting arm are fixedly connected to the test bench, the test bench can swing in a non-unidirectional manner in the xy plane after applying the y-direction exciting force, thereby realizing the test of composite degrees of freedom; during the above test, since the movement direction of the test bench is not a single direction, the limit member is not installed during the test.

[0029] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-degree-of-freedom noise test bench, characterized by: It includes a base, a test bench, a transmission mechanism and a power device; the test bench includes two x-direction side surfaces, two y-direction side surfaces and two z-direction side surfaces, wherein one x-direction side surface is provided with two first docking portions, the two y-direction side surfaces are each provided with a second docking portion, and the z-direction side surface located relatively to the lower side is provided with two third docking portions; the transmission mechanism includes two transmission groups, each transmission group includes a first transmission member, a second transmission member and a plurality of connecting rods, the first transmission member includes a first hinged portion movably hinged to the base and limited in the y direction, a first bracket that can swing in the x direction, a second bracket that can swing in the z direction and a driving bracket that can be connected to the power device; the second transmission member includes a second hinged portion movably hinged to the base and limited in the x direction, a third bracket that can swing in the z direction and a fourth bracket that can swing in the y direction; the first bracket and the second bracket can be connected to a first docking portion and a third docking portion respectively through the connecting rod, and the third bracket and the fourth bracket can be connected to the second bracket and a second docking portion respectively through the connecting rod.

2. A multi-degree-of-freedom noise test bench according to claim 1, characterized in that: The test bench is provided with a connecting block at each junction of the x-direction side and the y-direction side, the base includes a mounting base block and a limiting member, the limiting member includes connecting parts located at both ends and a limiting spring plate located in the middle, the connecting block and the mounting base block form a first mounting position that can be detachably connected to the two ends of the limiting member and make the limiting spring plate parallel to the x-direction side, a second mounting position that can be detachably connected to the two ends of the limiting member and make the limiting spring plate parallel to the y-direction side, and a third mounting position that can be detachably connected to the two ends of the limiting member and make the limiting spring plate parallel to the z-direction side.

3. A multi-degree-of-freedom noise test bench according to claim 2, characterized in that: The first mounting position includes a first connecting surface located on the connecting block and a first mounting surface located on the mounting base block, the first connecting surface is perpendicular to the yz plane, and the first mounting surface is parallel to the yz plane; the second mounting position includes a second connecting surface located on the connecting block and a second mounting surface located on the mounting base block, the second connecting surface is perpendicular to the xz plane, and the second mounting surface is parallel to the xz plane; the third mounting position consists of a third connecting surface located on the connecting block and a third mounting surface located on the mounting base block, the third connecting surface is perpendicular to the xy plane, and the third mounting surface is parallel to the xy plane; the two ends of the limiting member respectively form a first connecting end and a second connecting end, the first connecting end has a first connecting hole whose opening direction is parallel to the limiting spring piece, and the second connecting end has a second connecting hole whose opening direction is perpendicular to the limiting spring piece.

4. The multi-degree-of-freedom noise test bench according to claim 3, characterized in that: The first connecting surface forms an angle of 45° with the xz plane, the second connecting surface forms an angle of 45° with the xy plane, and the third connecting surface forms an angle of 45° with the yz plane.

5. The multi-degree-of-freedom noise test bench according to claim 1, characterized in that: The end of the first bracket forms an x-direction terminal with an x-direction connection hole, the end of the second bracket forms a first z-direction terminal with a z-direction connection hole, the end of the third bracket forms a second z-direction terminal with a z-direction connection hole, and the end of the fourth bracket forms a y-direction terminal with a y-direction connection hole.

6. The multi-degree-of-freedom noise test bench according to claim 5, characterized in that: The end of the first bracket forms a first branch and a second branch arranged vertically, the first branch and the second branch form an angle, the end of the first branch is provided with an upper connecting terminal corresponding to the third docking portion, and the end of the second branch is provided with a lower connecting terminal corresponding to the third bracket.

7. The multi-degree-of-freedom noise test bench according to claim 1, characterized in that: The base includes a bottom plate, a support frame vertically connected to the bottom plate, and a support platform connected to the upper end of the support frame. The upper side of the bottom plate is provided with a first / second mounting frame that can be movably hinged to the first / second hinged part, and the mounting base block is fixed to the upper side of the support platform.

8. The multi-degree-of-freedom noise test bench according to claim 1, characterized in that: The upper side of the support platform is provided with a supporting airbag or an airbag reserved portion for installing the supporting airbag. The supporting airbag or the airbag reserved portion, and the z-direction side surface of the test platform relatively located at the lower side is provided with an airbag positioning portion corresponding to the position of the supporting airbag or the airbag reserved portion.

9. The multi-degree-of-freedom noise test bench according to claim 1, characterized in that: The upper side surface of the support platform is provided with a balance pole extending along the y direction or a balance pole reserved portion for installing the balance pole, and the z-direction side surface of the test platform located relatively at the lower side is provided with a balance pole positioning portion corresponding to the end of the balance pole or the position of the balance pole reserved portion.

10. The multi-degree-of-freedom noise test bench according to claim 1, characterized in that: The abnormal sound test bench also includes a limit arm and a mounting seat, the limit arm includes a Y-shaped first connecting arm, a second connecting arm and a third connecting arm, the end of the first connecting arm is connected to the mounting seat, and an x-direction side surface of the test bench is connected to the ends of the first connecting arm and the second connecting arm or is provided with a connecting arm reserved portion that can be connected to the ends of the first connecting arm and the second connecting arm.

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