A multi-degree-of-freedom noise testing bench

Abstract

This invention provides a multi-degree-of-freedom noise testing bench, comprising a base, a test bench, a transmission mechanism, and a power unit. The transmission mechanism includes two transmission groups, each comprising a first transmission component, a second transmission component, and several connecting rods. The first transmission component includes a first support that can swing in the x-direction, a second support that can swing in the z-direction, and a drive support connected to a first hinge and driven by the power unit. The second transmission component includes a second hinge that is movably hinged to the base and limited in the x-direction, a third support that can swing in the z-direction, and a fourth support that can swing in the y-direction. The first and second supports can be connected to the test bench via connecting rods, and the third and fourth supports can be connected to the second support and the test bench respectively via connecting rods. This invention can achieve multi-degree-of-freedom simulation of the test bench through two power units, providing comprehensive functionality and high accuracy in noise testing.

Description

Technical Field

[0001] This invention relates to the field of vehicle performance testing technology, and more specifically to a multi-degree-of-freedom abnormal noise test bench. Background Technology

[0002] In recent years, abnormal noises in automobiles have received increasing attention. As we all know, automobiles are assembled from numerous parts, and abnormal noises from these parts are a significant component of overall vehicle noise. Nowadays, major parts suppliers and automobile manufacturers pay close attention to abnormal noises from parts, typically using testing methods to determine if any parts are making unusual noises.

[0003] Road vibrations cause various rattles and squeaks inside the vehicle (buzz, squeak, rattle, etc.). These noises originate from various subsystems of the car, such as the driver's cockpit, seats, doors, console, headliner, HVAC, steering system, and many components such as seatbelt retractors, audio / entertainment / navigation equipment, and sun visors. There are over 1,000 contact points between these interior subsystems and components, all of which can potentially cause friction or impact noises.

[0004] A test bench used to test abnormal noises and performance risks of components is called a component abnormal noise vibration test bench system. This test bench is required to simulate all degrees of freedom of a real vehicle's motion. To achieve multi-degree-of-freedom simulation, power sources from multiple directions are needed. Patent application CN202410080685.9 discloses a vehicle abnormal noise detection platform, including a static platform, a dynamic platform, and four branch kinematic chains. These four kinematic chains are equipped with three hydraulic motors and one hydraulic cylinder. The four power mechanisms control the four kinematic chains to different motion states, thereby simulating the various degrees of freedom of vehicle motion. This technical solution requires a large number of power mechanisms to provide power sources from multiple directions, resulting in complex system control during operation and affecting the equipment's operational accuracy. Furthermore, the test bench relies heavily on numerous articulated structures, which can easily generate noise interference, affecting test accuracy, and also lead to rapid wear of moving parts and high equipment maintenance costs. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a multi-degree-of-freedom noise test bench. This noise test bench can provide power sources in the x, y, and z directions through two power units and corresponding transmission mechanisms, and multi-degree-of-freedom simulation can be achieved by changing the connection method of the transmission mechanism.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A multi-degree-of-freedom noise testing bench includes a base, a testing platform, a transmission mechanism, and a power unit. The testing platform includes two x-axis sides, two y-axis sides, and two z-axis sides. One x-axis side has two first docking portions, each of the two y-axis sides has one second docking portion, and the z-axis side, located opposite to the lower side, has two third docking portions. The transmission mechanism includes two transmission groups. Each transmission group includes a first transmission component, a second transmission component, and several connecting rods. The first transmission component includes a first hinge portion that is movably hinged to the base and limited in the y-axis direction, a first bracket that can swing in the x-axis direction, a second bracket that can swing in the z-axis direction, and a drive bracket that can be connected to the power unit. The second transmission component includes a second hinge portion that is movably hinged to the base and limited in the x-axis direction, a third bracket that can swing in the z-axis direction, and a fourth bracket that can swing in the y-axis direction. The first and second brackets can be connected to a first docking portion and a third docking portion, respectively, via the connecting rods. The third and fourth brackets can be connected to a second bracket and a second docking portion, respectively, via the connecting rods.

[0008] The "y-direction" limit refers to the fact that after the first hinge of the first transmission component 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 refers to the fact that after the second hinge of the second transmission component is movably hinged to the base, it can only move in the yz plane and cannot move in the x-direction.

[0009] Furthermore, the test bench is provided with a connecting block at the junction of each x-axis side and y-axis side. The base includes a mounting base block and a limiting member. The limiting member includes connecting parts at both ends and a limiting spring piece at the middle. The connecting block and the mounting base block form a first mounting position that can be detachably connected to both ends of the limiting member and makes the limiting spring piece parallel to the x-axis side, a second mounting position that can be detachably connected to both ends of the limiting member and makes the limiting spring piece parallel to the y-axis side, and a third mounting position that can be detachably connected to both ends of the limiting member and makes the limiting spring piece parallel to the z-axis side.

[0010] 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 being perpendicular to the yz plane and the first mounting surface being 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 being perpendicular to the xz plane and the second mounting surface being 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 being perpendicular to the xy plane and the third mounting surface being 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 having a first connecting hole with an opening direction parallel to the limiting spring piece, and the second connecting end having a second connecting hole with an opening direction perpendicular to the limiting spring piece.

[0011] Furthermore, the first connecting surface forms a 45° angle with the xz plane, the second connecting surface forms a 45° angle with the xy plane, and the third connecting surface forms a 45° angle with the yz plane.

[0012] Furthermore, the end of the first bracket is formed with an x-direction end having an x-direction connection hole, the end of the second bracket is formed with a first z-direction end having a z-direction connection hole, the end of the third bracket is formed with a second z-direction end having a z-direction connection hole, and the end of the fourth bracket is formed with a y-direction end having a y-direction connection hole.

[0013] Furthermore, the end of the first bracket forms a first branch and a second branch arranged vertically, the first branch and the second branch forming an angle, the end of the first branch is provided with an upper connecting end corresponding to the third docking portion, and the end of the second branch is provided with a lower connecting end corresponding to the third bracket.

[0014] Furthermore, the base includes a base plate, a support frame perpendicularly connected to the base plate, and a support platform connected to the upper end of the support frame. The upper side of the base plate is provided with a first / second mounting bracket that can be movably hinged to the first / second hinge portion. The mounting base block is fixed to the upper side of the support platform.

[0015] Furthermore, the upper side of the support platform is provided with a support airbag or an airbag reservation part for installing the support airbag, and the test platform has an airbag positioning part on the z-direction side opposite to the lower side that corresponds to the position of the support airbag or airbag reservation part.

[0016] Furthermore, the upper side of the support platform is provided with a balance bar extending in the y direction or a balance bar reserved part for installing the balance bar, and the test platform is provided with a balance bar positioning part on the z-direction side opposite to the lower side, which corresponds to the position of the end of the balance bar or the balance bar reserved part.

[0017] Furthermore, the abnormal noise test bench also includes a limiting arm and a mounting base. The limiting arm includes a Y-shaped connecting first connecting arm, a second connecting arm, and a third connecting arm. The end of the first connecting arm is connected to the mounting base. One x-direction side 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.

[0018] In summary, the following beneficial effects can be achieved by applying this invention:

[0019] 1. The present invention drives the first transmission component through a power device. When the connection relationship between the first transmission component and the test bench and the second transmission component is changed, the test bench can be made to vibrate along the x, y and z directions respectively. That is, the multi-degree-of-freedom simulation of the test bench can be realized by only two power devices. The structure is compact and easy to operate.

[0020] 2. The present invention uses a first transmission component and a second transmission component for transmission. Compared with the kinematic chain in the prior art, the present invention reduces the setting of the hinge structure, and the transmission mechanism has more stable working performance and longer service life.

[0021] 3. This invention can simulate multiple composite degrees of freedom by changing the connection relationship between the first transmission component, the second transmission component, and the test platform, as well as the operation flow of the two transmission groups, thereby improving the test effect of abnormal noise.

[0022] 4. In some embodiments of the present invention, a connecting block, a mounting base block, and a limiting component are provided. The limiting component has different limiting effects in three different mounting positions, 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. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the abnormal noise test bench in the embodiment;

[0024] Figure 2 for Figure 1 Front view of the test bench;

[0025] Figure 3 for Figure 1 Schematic diagrams of the first and second transmission components;

[0026] Figure 4 for Figure 1 Schematic diagram of the structure of the connecting block and the mounting base block;

[0027] Figure 5 for Figure 1 Schematic diagram of the middle limiting component;

[0028] Figure 6 This is a schematic diagram showing the limiting component in three different mounting positions.

[0029] Figure 7 This is a schematic diagram of the abnormal noise test bench in another embodiment;

[0030] Figure 8 This is a schematic diagram of the abnormal noise test bench in another embodiment;

[0031] Figure 9 This is a schematic diagram of the abnormal noise test bench in another embodiment;

[0032] In the picture:

[0033] 1-Base, 11-Base 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 component, 151-First connecting end, 152-Second connecting end, 153-Limiting spring, 16-First mounting bracket, 17-Second mounting bracket;

[0034] 2-Test stand, 21a-X-side, 21b-Y-side, 21c-Z-side, 22-First docking part, 23-Second docking part, 24-Third docking part, 25-Connecting block, 251-First connecting surface, 252-Second connecting surface, 253-Third connecting surface;

[0035] 3-Transmission mechanism, 31-First transmission component, 311-First hinge, 312-First bracket, 3121-x-direction end, 313-Second bracket, 3131-Upper connecting end, 3132-Lower connecting end, 314-Drive bracket, 32-Second transmission component, 321-Second hinge, 322-Third bracket, 3221-Second z-direction end, 323-Fourth bracket, 3231-y-direction end, 33-Connecting rod;

[0036] 4-Power unit;

[0037] 5-Support airbags;

[0038] 6-Balance bar, 61-Base connection part, 62-Test bench connection part;

[0039] 7-Limiting arm, 71-First connecting arm, 72-Second connecting arm, 73-Third connecting arm. Detailed Implementation

[0040] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0041] It should be noted that the x, y, and z directions described in this invention are based on a three-dimensional rectangular coordinate system, and the x, y, and z directions are perpendicular to each other. The description of the x, y, and z directions in this invention is only used to indicate the relative positional relationship between different technical features, and does not limit the absolute position of the technical features. Example

[0042] Reference Figures 1-6An embodiment of the first aspect of the present invention provides a multi-degree-of-freedom abnormal noise test bench, which includes a base 1, a test platform 2, a transmission mechanism 3, and a power unit 4, specifically:

[0043] The base includes a base plate 11, a support frame 12, a support platform 13, mounting base blocks 14, and limiting members 15. The base plate 11 is horizontally fixed to the foundation during use. The support frame 12 is vertically connected to the upper side of the base plate, providing an elevated effect. The support platform 13 is connected to the upper end of the support frame and is horizontally positioned during use. The mounting base blocks 14 are fixedly connected to the upper side of the support platform. The limiting members 15 can be detachably connected to the mounting base blocks. There are two support platforms 13, symmetrically arranged in an xz plane, with two support frames 12 at the bottom of each platform. There are four mounting base blocks 14, with two mounting base blocks fixed to the upper side of each support platform. The mounting base is symmetrically arranged in the xz plane. The mounting base 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. Limiting member mounting holes are provided on the first, second, and third mounting surfaces. The two ends of the limiting member 15 form a first connecting end 151 and a second connecting end 152, respectively, and a limiting spring is provided in the middle. The first connecting end is provided with a first connecting hole with the opening direction parallel to the limiting spring, and the second connecting end is provided with a second connecting hole with the opening direction perpendicular to the limiting spring. 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.

[0044] The test bench 2 has two x-direction sides 21a with the x-direction as the normal, two y-direction sides 21b with the y-direction as the normal, and two z-direction sides 21c with the z-direction as the normal. Two first mating parts 22 are connected to one of the x-direction sides 21a, and one second mating part 23 is connected to each of the two y-direction sides 21b. During use, two third mating parts 24 are connected to one of the z-direction sides near the lower side. The first mating parts have a first mating hole with the opening direction in the x-direction, the second mating parts have a second mating hole with the opening direction in the y-direction, and the third mating parts have a third mating hole with the opening direction in the z-direction. The test bench has a connecting block 25 at each of the four corners formed by the intersection of the x-direction sides and the y-direction sides. Each connecting block includes 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 4-6When the two ends of the limiting member are respectively connected to the first connecting surface 251 and the first mounting surface 141, that is, when the limiting member is in the first mounting position 15a, the normal direction of the limiting spring is in the x direction. Due to the limitations of the physical structure, the limiting spring can only bend in the x direction. At this time, the limiting member allows the test platform to vibrate only in the x direction. Similarly, when the two ends of the limiting member are respectively connected to the second connecting surface 252 and the second mounting surface 142, that is, when the limiting member is in the second mounting position 15b, the test platform can only vibrate in the y direction. When the third connecting surface and the third mounting surface are reached, that is, when the limiting component is in the third mounting position 15c, the test table can only vibrate in the z-direction, thereby reducing or eliminating the interference of the test table moving in a non-preset direction during the abnormal noise test, making the test results more accurate; furthermore, the first connecting surface forms a 45° angle with the xz plane, the second connecting surface forms a 45° angle with the xy plane, and the third connecting surface forms a 45° angle with the yz plane. By setting the above angles, the first and second mating holes can be easily operated when the limiting component is installed;

[0045] The power mechanism includes two transmission groups. Each transmission group includes a first transmission member 31, a second transmission member 32, and a connecting rod 33. The first transmission member 31 includes a first hinge portion 311 located in the middle and a first bracket 312, a second bracket 313, and a drive bracket 314 extending in different directions and connected to the first hinge portion. The first hinge portion 311 is hinged to a first mounting bracket 16 disposed on the upper side of the base plate 11, so that the first transmission member can swing based on the first mounting bracket. 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 end with an x-direction connection hole. The connecting rod can connect the first bracket to the x-direction side 21a through the x-direction end and the first docking portion, so that the first bracket can apply an x-direction excitation 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 end with a z-direction opening. More specifically, the end of the second bracket forms an upper and lower... Two branches are provided. The upper connecting end 3131 is formed at the end of the first branch located on the upper side, and the lower connecting end 3132 is formed at the end of 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 part, so that the second bracket can apply a z-direction excitation force to the test platform. The end of the drive 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 hinge part 321 located in the middle and a third bracket 322 and a fourth bracket 323 extending in different directions connected to the second hinge part 321. 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 part 23, so that the fourth bracket can apply a y-direction excitation force to the test platform.

[0046] The working principle of this embodiment is as follows: When an x-axis excitation force needs to be applied, the first bracket is connected to the test bench via a connecting rod, and the limiting member is fixed in the first mounting position. The power device drives the drive bracket to move, so that the first bracket can apply an x-axis excitation force to the test bench. When a z-axis excitation force needs to be applied, the second bracket is connected to the test bench via a connecting rod, and the limiting member is fixed in the third mounting position. The power device drives the drive bracket to move, so that the second bracket can apply a z-axis excitation force to the test bench. When a y-axis excitation force needs to be applied, the fourth bracket is connected to the test bench via a connecting rod, and the third bracket is connected to the second bracket via a connecting rod. The power device drives the drive bracket to move, so that the fourth bracket can apply a z-axis excitation force to the test bench.

[0047] Furthermore, since the present invention includes two transmission groups, the power devices connected to each of the two transmission groups can receive different motion commands, thereby achieving some composite motion effects. For example, the second supports of both the first and second transmission groups are connected to the test platform, and the motion directions of the first and second transmission groups are opposite. That is, when the first motion group lifts the left half of the test platform in the y-direction upward, the second motion group pulls the right half of the test platform in the y-direction downward. In this state, the test platform will swing, thereby realizing the composite degree of freedom test other than x, y, and z.

[0048] Reference Figure 7 In some embodiments of the present invention, the base further includes a support airbag 5 disposed on the upper side of the support platform. The support airbag 5 is used to support the test platform before the limiting component is fixedly installed, and to adjust the test platform to a suitable height to facilitate the fixing of the limiting component. The support platform is provided with four airbag pre-reserved parts for installing the support airbags. The airbag pre-reserved parts are located near the mounting base block. When performing a single-direction vibration test in the x, y, or z direction, the four airbag pre-reserved parts are all equipped with support airbags, so that the test platform is subjected to uniform support force to facilitate the fixing of the limiting component at the four corners. The support airbag 5 is detachably connected to the support platform to adapt to different test scenario requirements.

[0049] Reference Figure 8 In some embodiments of the present invention, the base further includes a balance bar 6 disposed on the upper side of the support platform. The balance bar is disposed across the two support platforms along the y-direction. The two ends of the balance bar are respectively provided with a base connecting part 61 and a test platform connecting part 62. The base connecting part is fixedly connected to the lower support platform, and the test platform connecting part is connected to the upper test platform. The balance bar is limited and fixed so that its axis can only be maintained in 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 disposed on the x-direction side close to the test platform. When the test platform is subjected to an excitation force including the z-direction, the test platform will pitch and tilt, thereby realizing the 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 unidirectional, no limiting component is installed during the test. At a position away from the balance bar, two support airbags are disposed on the upper side of the support platform. The support airbags are used to provide support force before the transmission mechanism is connected.

[0050] Reference Figure 9In some embodiments of the present invention, the abnormal noise test bench further includes a limiting arm 7 and a mounting base. The mounting base is fixed on a horizontal foundation during use. The limiting arm includes a first connecting arm 71, a second connecting arm 73, and a third connecting arm 74 connected in a Y-shaped structure. The first connecting arm is movably connected to the mounting base, allowing the first connecting arm to rotate in the xy plane based on the mounting base. A reserved portion for connecting arms that can be connected to the second and third connecting arms is provided on one x-side of the test bench. When the second and third connecting arms are fixedly connected to the test bench, the test bench can swing in a non-unidirectional manner in the xy plane after a y-direction excitation force is applied, thus achieving the test of composite degrees of freedom. During the above test, since the movement direction of the test bench is not unidirectional, no limiting component is installed during the test.

[0051] Finally, it should be noted that the above description 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 foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-degree-of-freedom noise testing bench, characterized in that: The system includes a base, a test bench, a transmission mechanism, and a power unit. The test bench comprises two x-axis sides, two y-axis sides, and two z-axis sides. One x-axis side has two first docking portions, each of the two y-axis sides has one second docking portion, and the z-axis sides, located opposite each other, have two third docking portions. The transmission mechanism comprises two transmission groups. Each transmission group includes a first transmission component, a second transmission component, and several connecting rods. The first transmission component includes a first hinge portion that is movably hinged to the base and limited in the y-axis direction, a first bracket that can swing in the x-axis direction, a second bracket that can swing in the z-axis direction, and a drive bracket that can be connected to the power unit. The second transmission component includes a second hinge portion that is movably hinged to the base and limited in the x-axis direction, a third bracket that can swing in the z-axis direction, and a fourth bracket that can swing in the y-axis direction. The first and second brackets can be connected to a first docking portion and a third docking portion, respectively, via the connecting rods. The third and fourth supports can be connected to the second support and a second docking part respectively via the connecting rod; the test platform 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 at both ends and a limiting spring piece at the middle; the connecting block and the mounting base block form a first mounting position that can be detachably connected to both ends of the limiting member and makes the limiting spring piece parallel to the x-direction side, a second mounting position that can be detachably connected to both ends of the limiting member and makes the limiting spring piece parallel to the y-direction side, and a third mounting position that can be detachably connected to both ends of the limiting member and makes the limiting spring piece parallel to the z-direction side; the base includes a base plate, a support frame perpendicularly connected to the base plate, and a support platform connected to the upper end of the support frame; the upper side of the base plate is provided with a first / second mounting frame that can be movably hinged to the first / second hinge part; the mounting base block is fixed to the upper side of the support platform.

2. The multi-degree-of-freedom abnormal noise test bench according to claim 1, 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 with an opening direction parallel to the limiting spring piece, and the second connecting end has a second connecting hole with an opening direction perpendicular to the limiting spring piece.

3. The multi-degree-of-freedom noise testing bench according to claim 2, characterized in that: The first connecting surface forms a 45° angle with the xz plane, the second connecting surface forms a 45° angle with the xy plane, and the third connecting surface forms a 45° angle with the yz plane.

4. The multi-degree-of-freedom abnormal noise test bench according to claim 1, characterized in that: The first bracket has an x-axis end with an x-axis connection hole at its end, the second bracket has a first z-axis end with a z-axis connection hole at its end, the third bracket has a second z-axis end with a z-axis connection hole at its end, and the fourth bracket has a y-axis end with a y-axis connection hole at its end.

5. The multi-degree-of-freedom abnormal noise test bench according to claim 4, characterized in that: The end of the second bracket forms a first branch and a second branch arranged vertically, with the first branch and the second branch forming an angle. The end of the first branch is provided with an upper connecting end corresponding to the third docking portion, and the end of the second branch is provided with a lower connecting end corresponding to the third bracket.

6. The multi-degree-of-freedom abnormal noise test bench according to claim 1, characterized in that: The upper side of the support platform is provided with a support airbag or an airbag pre-reservation part for installing the support airbag. The test platform has an airbag positioning part on the z-direction side opposite to the lower side, which corresponds to the position of the support airbag or airbag pre-reservation part.

7. The multi-degree-of-freedom abnormal noise test bench according to claim 1, characterized in that: The upper side of the support platform is provided with a balance bar extending in the y direction or a balance bar reserved part for installing the balance bar. The test platform is provided with a balance bar positioning part on the z-direction side opposite to the lower side, which corresponds to the position of the end of the balance bar or the balance bar reserved part.

8. The multi-degree-of-freedom abnormal noise test bench according to claim 1, characterized in that: The abnormal noise test bench also includes a limiting arm and a mounting base. The limiting arm includes a Y-shaped connecting first connecting arm, a second connecting arm and a third connecting arm. The end of the first connecting arm is connected to the mounting base. One x-direction side 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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