Abnormal sound test bench capable of rapidly switching modes

Abstract

The invention provides an abnormal sound test bench capable of rapidly switching modes. The abnormal sound test bench comprises a base, a first test unit, a second test unit and a power device arranged between the first test unit and the second test unit. The power device comprises two vibration exciters arranged in the y direction. The first test unit can make a to-be-tested part generate single-degree-of-freedom vibration in x, y and z directions, and the second test unit can make the part generate pitching and side-tipping composite-degree-of-freedom vibration. The first test unit and the second test unit can be respectively driven by the same group of power device, only the tested part needs to be transferred in a short distance during mode conversion, the same group of power device is used in the two test modes, and the test efficiency is greatly improved during the test of the rear half part. The relevant parameters between the tested part and the power device are acquired in the first half part, so that the debugging time between the part and the power device is greatly saved, and the testing efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle performance detection, and in particular to an abnormal noise test bench with a fast switching mode. Background Art

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

[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 abnormal noise and performance risks of components is called a component abnormal noise vibration test bench system. The test bench is required to have various degrees of freedom that simulate the movement of the real vehicle. In order to achieve multi-degree-of-freedom simulation, power sources from multiple directions are required. In the existing test scheme, abnormal noise testing includes single-degree-of-freedom testing and compound-degree-of-freedom testing. In the single-degree-of-freedom test, the object under test undergoes unidirectional vibration in the horizontal or vertical direction. In the compound-degree-of-freedom test, the object under test undergoes rotational vibration formed by multi-directional motion. In the two degrees of freedom test modes, the abnormal noise detection equipment needs to have different transmission structures to provide different modes of exciting force. Therefore, the mode switching process involves the transfer of the components under test between different test benches or the modification of the test bench's own structure, which is time-consuming and labor-intensive, affecting the test efficiency. Summary of the invention

[0005] In order to solve the above problems, the present invention provides an abnormal sound test bench with fast switching modes, which can quickly switch between the 4D mode and the VPR mode of the abnormal sound test, reducing the disassembly and assembly of parts during the switching process and improving the efficiency of the abnormal sound test.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A fast-switching mode abnormal noise test bench comprises a base, a first test unit, a second test unit and a power device arranged between the first test unit and the second test unit; The power device comprises two vibrators arranged in the y direction; The first test unit includes a first support frame, a first movable platform and a first transmission mechanism, the first movable platform is connected to the first support platform through a unidirectional vibrating elastic limiter, the first movable platform is provided with a first connecting surface on one side in the x direction, a second connecting surface on the bottom in the z direction, and third connecting surfaces on both sides in the y direction; the first transmission mechanism includes two transmission groups, each transmission group includes a first transmission member, the first transmission member includes a first base part movably hinged to the base and limited in the y direction, the first base part is connected with a first transmission arm extending in the z direction, a second transmission arm extending in the x direction and a first driving arm extending in the direction of the power device, a first corresponding structure that can form a connection is provided between the first transmission arm and the first connecting surface, a second corresponding structure that can form a connection is provided between the second transmission arm and the second connecting surface, and a third corresponding structure that can form a connection is provided between the first driving arm and the exciter; The second test unit comprises a second support frame, a second movable platform, a pitch limiter, a roll limiter and a second transmission mechanism; the second support frame is provided with a first mounting portion, the second movable platform is provided with a second mounting portion at the bottom in the z direction, and a third mounting portion is provided at an x-direction side of the second movable platform; the roll limiter comprises a rod body arranged in the y direction and two first elastic components respectively located at two ends of the rod body, the first mounting portion and the second mounting portion are respectively connected to two ends of the rod body through the first elastic component; the pitch limiter comprises a mounting seat and an extension arm, the mounting seat comprises a base fixedly connected to the base and a second elastic component arranged on the upper side of the base, the extension arm The two ends of the extension arm respectively form a lower connecting part that can be connected to the second elastic component and an upper connecting part that can be connected to the third mounting part, and the center point of the upper connecting part and the center point of the lower connecting part are in the same xz plane; the second transmission mechanism includes two third transmission members arranged in the y direction, and the third transmission member includes a third base that is movably hinged to the base and limited in the y direction, and the third base is connected to a fifth transmission arm extending in the x direction and a second driving arm extending in the direction of the power device, and a fourth corresponding structure that can be connected is provided between the fifth transmission arm and the bottom of the second movable platform in the z direction, and a fifth corresponding structure that can be connected is provided between the second driving arm and the exciter.

[0007] It should be noted that the "y-direction limitation" mentioned in the present invention 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 limitation" mentioned in the present invention 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] It should also be explained that the "x-direction extension" mentioned in the present invention refers to the existence of a distance between the projections of the front and rear ends of an object in the extension direction on a certain x-coordinate axis, and does not limit the front and rear ends of the object in the extension direction to pass through the same x-coordinate axis. For example, the line connecting the front and rear ends of the object can extend along the xz plane and form an angle with the x-axis, and the same applies to "y-direction extension" and "z-direction extension".

[0009] Furthermore, the transmission group also includes a second transmission member, which includes a second base movably hinged to the base and limited in the x-direction, the second base is connected to a third transmission arm extending in the y-direction and a fourth transmission arm extending in the z-direction, a sixth corresponding structure that can be connected is provided between the third transmission arm and the second transmission arm, and a seventh corresponding structure that can be connected is provided between the fourth transmission arm and the third connecting surface.

[0010] Furthermore, the ends of the first driving arm and the second driving arm are detachably connected to the first driving connector and the second driving connector respectively, and the first driving connector and the second driving connector are arranged in the z direction and have a gap; the exciter is provided with an excitation output rod corresponding to the positions of the first driving connector and the second driving connector.

[0011] Furthermore, the third mounting portion is arranged on a side close to the first connecting surface.

[0012] Furthermore, the first movable platform includes a plurality of connecting blocks, the first supporting frame includes a mounting base block, the connecting block includes a first positioning surface, a second positioning surface and a third positioning surface, and the mounting block includes a first mounting surface, a second mounting surface and a third mounting surface; the elastic limiting member includes a first connecting portion located at the first end and connectable to the first positioning surface, the second positioning surface or the third positioning surface, a second connecting portion located at the second end and connectable to the first mounting surface, the second mounting surface or the third mounting surface, and a limiting spring sheet located in the middle; the first positioning surface and the first mounting surface form a first mounting position in which the limiting spring sheet is parallel to the yz plane, the second positioning surface and the second mounting surface form a second mounting position in which the limiting spring sheet is parallel to the xz plane, and the third positioning surface and the third mounting surface form a third mounting position in which the limiting spring sheet is parallel to the xy plane.

[0013] Furthermore, the abnormal sound test bench also includes a transmission connecting rod, and the ends of the first transmission arm, the second transmission arm, the third transmission arm, the fourth transmission arm and the fifth transmission arm are all provided with fixed ends for installing the connecting rod.

[0014] Further, the first elastic component includes a central axis and a first elastic block, the central axis includes a limit stop block arranged in the middle of the outer wall and a first sleeve portion located on the first side of the limit stop block, an axially through inner connecting hole is provided inside the central axis, and a first matching hole that can match with the outer wall of the first sleeve portion is formed in the middle of the first elastic block; the first mounting portion / the second mounting portion is fixedly connected to the central axis through the inner connecting hole, and the end of the rod body elastically abuts against the first elastic block.

[0015] Furthermore, the first limit member also includes two adjustment components arranged at both ends of the rod body, the adjustment components include a connecting screw and an adjustment block, the connecting screw is coaxially arranged and fixedly connected to the rod body, a connecting screw hole that can be movably matched with the connecting screw is formed in the middle of the adjustment block, and the first elastic fast elastically abuts against the adjustment block.

[0016] Furthermore, the second elastic component includes a mounting shaft arranged in the z direction and fixedly connected to the base, and an elastic sleeve sleeved and fixed on the outer periphery of the mounting shaft, and the lower connecting portion can be fixedly connected to the outer periphery of the elastic sleeve.

[0017] Furthermore, the extension arm includes a main connecting arm and two symmetrically arranged branch connecting arms, the first end of the main connecting arm is connected to the second elastic component, and the second end extends along an xz plane toward the extension platform, the branch connecting arm is connected to the second end of the main connecting arm and extends toward the platform, an angle is formed between the two branch connecting arms, and the third mounting portion includes two mounting areas corresponding to the branch connecting arms.

[0018] Furthermore, the base includes a vibration isolation base and a mounting base fixed to the upper side of the vibration isolation base, and the vibration isolation base includes a column, a shock absorber arranged at the upper end of the column, a supporting body arranged above the shock absorber, and a vibration isolation pad arranged above the supporting body.

[0019] In summary, the application of the present invention can achieve the following beneficial effects: 1. The present invention can drive the first test unit and the second test unit respectively through the same set of power devices, wherein the first test unit can realize unidirectional vibration in the horizontal or vertical direction, and the second test unit can realize pitch compound vibration on the xz plane or roll compound vibration on the yz plane. When performing mode conversion, it is only necessary to transfer the tested parts between the first movable platform and the second movable platform over a short distance. There is no need to transfer the tested parts over a long distance between multiple devices, and there is no need to modify the equipment to meet the requirements of different test modes, which saves the preparation time between different test modes and improves the test efficiency.

[0020] 2. The two test modes of the present invention use the same set of power devices. In the second half of the test, since the relevant parameters between the tested components and the power devices have been obtained in the first half, the debugging time between the components and the power devices is greatly saved, and the test efficiency is improved.

[0021] 3. The present invention integrates two test units, which can save some unnecessary equipment parts and reduce equipment costs compared to the solution of separate settings.

[0022] 4. The present invention sets up a vibration isolation base to provide support for the first test unit and the second test unit. The vibration isolation base can reduce the interference noise generated between the equipment and the ground during operation, and improve the accuracy of abnormal sound testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the abnormal noise test bench of the fast switching mode in the embodiment; Figure 2 for Figure 1 A top view of Figure 3 is a structural schematic diagram of a first transmission mechanism; Figure 4 It is a structural schematic diagram of the connection block and the installation block; Figure 5 It is a schematic diagram of the elastic limiter and its installation structure; Figure 6 is a structural schematic diagram of the first movable platform; Figure 7 is a schematic diagram of the structure of the roll limiter; Figure 8 Exploded view of the first elastic component Fig. 9 is a schematic diagram of the structure of the pitch limiter; Fig.10 is a schematic diagram of the structure of the base; In the figure: 1-base, 11-mounting base plate, 12-column, 13-shock absorber, 14-support base, 15-vibration isolation pad; 2-first support frame, 21-mounting block, 211-first mounting surface, 212-second mounting surface, 213-third mounting surface, 22-elastic limiting member, 221-first connecting portion, 222-second connecting portion, 223-limiting spring sheet, 22a-first mounting position, 22b-second mounting position, 22c-third mounting position; 3-first movable platform, 31-first connecting surface, 32-second connecting surface, 33-third connecting surface, 34-docking block, 35-connecting block, 351-first positioning surface, 352-second positioning surface, 353-third positioning surface; 4-first transmission mechanism, 41-first transmission member, 411-first base, 412-first driving arm, 4121-first driving connecting head, 413-first transmission arm, 414-second transmission arm, 415-fixed end, 42-second transmission member, 421-second base, 422-third transmission arm, 423-second transmission arm, 43-transmission connecting rod; 5-second supporting frame, 51-first mounting portion; 6-second movable platform, 61-second mounting portion, 62-transmission connecting block, 63-third mounting portion; 7-second transmission mechanism, 71-third transmission member, 711-third base, 712-second driving arm, 7121-second driving connector, 713-fourth transmission arm; 8-roll limiter, 81-rod body, 82-first elastic component, 821-central shaft, 8211-limit stopper, 8212-first sleeve connection part, 8213-second sleeve connection part, 822-first elastic block, 823-second elastic block, 83-connecting screw, 84-adjusting block; 9-pitch limiter, 91-mounting seat, 911-base, 912-second elastic component, 9121-mounting shaft, 9122-elastic sleeve, 92-extension arm, 921-main connecting arm, 922-branch connecting arm, 923-lower connecting part, 924-upper connecting part; 10-power device, 101-vibration output rod. DETAILED DESCRIPTION

[0024] 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.

[0025] 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

[0026] Reference Figures 1 to 10The present invention provides a fast switching mode abnormal sound test bench, which includes a base 1, a first test unit and a second test unit are installed on the base, a power device 10 is installed between the first test unit and the second test unit, the first test unit is used to make the tested parts vibrate unidirectionally in the x, y and z directions respectively, and the second test unit is used to make the tested parts swing in the xz and yz planes.

[0027] The base 1 includes a vibration isolation base and a mounting base plate 11 fixed to the upper side of the vibration isolation base when in use. The vibration isolation base includes a column 12, a shock absorber 13 installed on the upper end of the column, a support base 14 erected above the column through the shock absorber, and a vibration isolation pad 15 arranged on the upper side of the support base. The vibration isolation pad is provided with a plurality of parallel groove-shaped silencer grooves and a plurality of mounting base holes. The mounting base plate is fixedly connected to the vibration isolation pad through the mounting base holes, and the mounting base plate is used to provide mounting sites for other mechanisms.

[0028] The power device 10 includes two vibration exciters arranged in the y direction, and each vibration exciter is provided with a vibration output rod 101 .

[0029] The first testing unit comprises a first supporting frame 2, a first movable platform 3 and a first driving mechanism 4; The first movable platform 3 is provided with a first connecting surface 31 on one side in the x direction, a second connecting surface 32 on the bottom in the z direction, and third connecting surfaces 33 on both sides in the y direction. Two docking blocks 34 with x-direction connecting holes arranged along the y direction are provided on the first connecting surface, two docking blocks with z-direction connecting holes arranged along the y direction are provided on the second connecting surface, and a docking block with a y-direction connecting hole is provided on the third connecting surface. A connecting block 35 is provided at each of the four corners of the first movable platform, and the connecting block has a first positioning surface 351, a second positioning surface 352, and a third positioning surface 353. The first support frame 2 is provided with a mounting block 21 and an elastic limiting member 22, the mounting block is provided with a first mounting surface 211, a second mounting surface 212 and a third mounting surface 213, the elastic limiting member includes a first connecting portion 221 located at the first end, a second connecting portion 222 located at the second end and a limiting spring piece 223 located in the middle, the first connecting portion can be fixedly connected to the first positioning surface, the second positioning surface or the third positioning surface, the second connecting portion can be fixedly connected to the first mounting surface, the second mounting surface or the third mounting surface, when the two ends of the elastic limiting member correspond to the first mounting surface and the first positioning surface, the elastic limiting member is in the first mounting position 22a , the limiting spring piece is parallel to the yz plane, so that the first movable platform can only vibrate in the x direction. When the two ends of the elastic limiting member correspond to the second mounting surface and the second positioning surface, the elastic limiting member is in the second mounting position 22b, and the limiting spring piece is parallel to the xz plane, so that the first movable platform can only vibrate in the y direction. When the two ends of the elastic limiting member correspond to the third mounting surface and the third positioning surface, the elastic limiting member is in the third mounting position 22c, and the limiting spring piece is parallel to the yz plane, so that the first movable platform can only vibrate in the x direction, thereby realizing the limitation of the movable platform in different directions, so that the movable platform can only vibrate in one direction along the x, y, and z directions, avoiding the test error caused by irrelevant vibration; The first transmission mechanism 4 includes two transmission groups, each of which includes a first transmission member 41 and a second transmission member 42. The first transmission member includes a first base 411 located in the middle, and the first base is connected with a first transmission arm 413 extending in the z direction, a second transmission arm 414 extending in the x direction, and a first driving arm 412 extending in the direction of the power device. The end of the first driving arm forms a detachable connection with the first driving connector 4121, and the first driving connector can be fixedly connected to the excitation output rod 101. The ends of the first transmission arm and the second transmission arm are both provided with a fixed end 415, and the fixed end can be connected to the docking block of the movable platform through the transmission connecting rod 43, so that the vibration of the first transmission arm or the second transmission arm is transmitted to the movable platform. The first base 411 is hinged to the base and limited in the y direction, so that the first The transmission member can only rotate in the xz plane with the first base as the center. During the rotation, the end of the first transmission arm will form an x-direction movement, and the end of the second transmission arm will form a z-direction movement; the second transmission member 42 includes a second base 421 located in the middle, and the second base is connected to a third transmission arm 422 extending in the y direction and a fourth transmission arm 423 extending in the z direction. The ends of the third transmission arm and the fourth transmission arm are also provided with fixed ends. The third transmission arm can be connected to the second transmission arm through a transmission connecting rod, and the fourth transmission arm can be connected to the docking block on the third connecting surface 33 through a transmission connecting rod. The second base 421 is hinged to the base and limited in the x direction, so that the second transmission member can only rotate in the yz plane with the second base as the center. When the second transmission arm drives the third transmission arm to move in the z direction, the fourth transmission arm will move in the y direction.

[0030] The second test unit includes a second support frame 5, a second movable platform 6, a second transmission mechanism 7, a roll limiter 8 and a pitch limiter 9; The second support frame 5 is provided with a first mounting portion 51, and the first mounting portion has a first mounting plate parallel to the xz plane; The second movable platform 6 is provided with a second mounting portion 61 and two transmission connection blocks 62 arranged along the y direction at the bottom of the z direction, the second mounting portion has a second mounting plate parallel to the xz plane, and a third mounting portion 63 is provided on one side of the second movable platform in the x direction, and the third mounting portion is located on a side close to the first connection surface; The second transmission mechanism 7 includes two third transmission members 71 arranged in the y direction, the third transmission member includes a third base 711 located in the middle, the third base is connected with a fifth transmission arm 713 extending in the x direction and a second driving arm 712 extending in the direction of the power device, the end of the second driving arm is detachably connected with the second driving connector 7121, the second driving end head is arranged in the z direction with the first driving end head, the second driving end head can be fixedly connected with the excitation output rod, the end of the fifth transmission arm is also provided with a fixed end head, the fixed end head can be connected with the transmission connection block 62 through the transmission connection rod 43, so that the movement of the fifth transmission arm acts on the second movable table, the third base 711 is hinged with the base and limited in the y direction, so that the third transmission member can only rotate in the xz plane with the third base as the center; The roll limiter 8 comprises a rod body 81 and a first elastic component 82 arranged at both ends of the rod body, the first elastic component abuts against the rod body through an adjusting component, the first elastic component comprises a central axis 821, a first elastic block 822 and a second elastic block 823, an inner hole penetrating along the axis is formed inside the central axis, a limit stopper 8211 is provided in the middle of the outer side of the central axis, a first sleeve portion 8212 and a second sleeve portion 8213 are formed on both sides of the limit stopper, the first elastic block and the second elastic block are respectively connected to the outer side surfaces of the first sleeve portion and the second sleeve portion, the adjusting component comprises a connecting screw fixedly connected to the end of the rod body and an abutting block with a screw hole movably matched with the connecting screw, the abutting block can adjust its position on the connecting screw and abut against the first elastic block, the second elastic block abuts against the first mounting plate or the second mounting plate, the first mounting plate or the second mounting plate is fixedly connected to the central axis through the inner hole; The pitch limiter 9 includes a mounting seat 91 and an extension arm 92, wherein the mounting seat includes a base 911 and a second elastic component 912 arranged on the base, wherein the second elastic component includes a mounting shaft 9121 arranged in the z direction and an elastic sleeve 9122 sleeved and fixed on the outer periphery of the mounting shaft, wherein the extension arm includes a main connecting arm 921 and a branch connecting arm 922, wherein the lower end of the main connecting arm forms a lower connecting portion 923 sleeved and fixed to the second elastic component, and the upper end of the branch connecting arm forms an upper connecting portion 924 fixedly connected to the third mounting portion, and the center of the lower connecting portion and the center of the upper connecting portion are on the same xz plane.

[0031] The working principle of this embodiment is as follows: Single degree of freedom vibration test: first, connect the two first drive arms to the two exciters. When the x-direction vibration test is required, connect the first transmission arm to the first movable platform through a transmission connecting rod. The two exciters vibrate synchronously so that the first transmission arm applies an exciting force in the x-direction to the first movable platform. When the z-direction vibration test is required, connect the second transmission arm to the first movable platform through a transmission connecting rod. The two exciters vibrate synchronously so that the second transmission arm applies an exciting force in the z-direction to the first movable platform. When the y-direction vibration test is required, connect the second transmission arm to the third transmission arm through a transmission connecting rod, and connect the fourth transmission arm to the first movable platform through a transmission connecting rod. The two exciters vibrate asynchronously so that the fourth transmission arm applies an exciting force in the y-direction to the first movable platform.

[0032] Composite degree of freedom vibration test: first, connect the two second driving arms to the two exciters. When a roll vibration test is required, the two exciters vibrate asynchronously. The two third transmission members provide periodic z-thrusts to the two sides of the platform in the y-direction in turn, so that the two sides of the platform in the y-direction in turn undergo lifting and lowering vibrations. The roll limiter provided in the present invention provides a limiting effect on the second movable platform. The end of the rod body is connected to the first mounting portion or the second mounting portion through a first elastic component. Between the rod body and the first mounting portion, the rod body can rotate on the yz plane with the first elastic component as the center. Between the rod body and the platform, the platform can rotate on the yz plane with the first elastic component as the center. When performing the pitch vibration test, the two exciters vibrate synchronously, and the two third transmission members provide synchronous z-direction exciting force to the loading platform, so that the second movable platform undergoes periodic lifting and lowering vibration. The pitch limit member provided in the present invention limits an x-direction side edge of the loading platform, and the second limit member can rotate around the mounting axis on any axial section of the mounting axis by utilizing the deformation of the elastic sleeve, but cannot undergo a single z-direction movement. Because the center position of the upper connecting part of the extension arm and the center position of the lower connecting part are in the same xz plane, the integrated assembly formed by the fixed connection between the loading platform and the second limit member will rotate on the xz plane around the mounting axis after being subjected to the z-direction exciting force.

[0033] 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 fast switching mode abnormal noise test bench, characterized by: It includes a base, a first test unit, a second test unit and a power device arranged between the first test unit and the second test unit, wherein the power device includes two vibrators arranged in the y direction; The first test unit includes a first support frame, a first movable platform and a first transmission mechanism, the first movable platform is connected to the first support platform through a unidirectional vibrating elastic limiter, the first movable platform is provided with a first connecting surface on one side in the x direction, a second connecting surface on the bottom in the z direction, and third connecting surfaces on both sides in the y direction; the first transmission mechanism includes two transmission groups, each transmission group includes a first transmission member, the first transmission member includes a first base part movably hinged to the base and limited in the y direction, the first base part is connected with a first transmission arm extending in the z direction, a second transmission arm extending in the x direction and a first driving arm extending in the direction of the power device, a first corresponding structure that can form a connection is provided between the first transmission arm and the first connecting surface, a second corresponding structure that can form a connection is provided between the second transmission arm and the second connecting surface, and a third corresponding structure that can form a connection is provided between the first driving arm and the exciter; The second test unit comprises a second support frame, a second movable platform, a pitch limiter, a roll limiter and a second transmission mechanism; the second support frame is provided with a first mounting portion, the second movable platform is provided with a second mounting portion and two transmission connection portions arranged in the y direction at the bottom in the z direction, a third mounting portion is provided on an x-direction side of the second movable platform, the roll limiter comprises a rod body arranged in the y direction and two first elastic components respectively located at both ends of the rod body, the first mounting portion and the second mounting portion are respectively connected to the two ends of the rod body through the first elastic components; the pitch limiter comprises a mounting seat and an extension arm, the mounting seat comprises a base fixedly connected to the base and a third mounting portion arranged on the upper side of the base Two elastic components, the two ends of the extension arm respectively form a lower connecting part that can be connected to the second elastic component and an upper connecting part that can be connected to the third mounting part, the center point of the upper connecting part and the center point of the lower connecting part are in the same xz plane; the second transmission mechanism includes two third transmission members arranged in the y direction, the third transmission member includes a third base that is movably hinged to the base and limited in the y direction, the third base is connected to a fifth transmission arm extending in the x direction and a second driving arm extending in the direction of the power device, a fourth corresponding structure that can be connected is provided between the fifth transmission arm and the transmission connecting part, and a fifth corresponding structure that can be connected is provided between the second driving arm and the exciter.

2. The abnormal noise test bench with fast switching mode according to claim 1, characterized in that: The transmission group also includes a second transmission member, which includes a second base that is movably hinged to the base and limited in the x direction. The second base is connected to a third transmission arm extending in the y direction and a fourth transmission arm extending in the z direction. A sixth corresponding structure that can be connected is provided between the third transmission arm and the second transmission arm, and a seventh corresponding structure that can be connected is provided between the fourth transmission arm and the third connecting surface.

3. The abnormal noise test bench with fast switching mode according to claim 1, characterized in that: The ends of the first driving arm and the second driving arm are detachably connected to the first driving connector and the second driving connector respectively, and the first driving connector and the second driving connector are arranged in the z direction and have a gap; the exciter is provided with an excitation output rod corresponding to the positions of the first driving connector and the second driving connector.

4. The abnormal noise test bench with fast switching mode according to claim 1 is characterized by: The first movable platform includes a plurality of connecting blocks, the first supporting frame includes a mounting base block, the connecting block includes a first positioning surface, a second positioning surface and a third positioning surface, and the mounting block includes a first mounting surface, a second mounting surface and a third mounting surface; the elastic limiting member includes a first connecting portion located at the first end and connectable to the first positioning surface, the second positioning surface or the third positioning surface, a second connecting portion located at the second end and connectable to the first mounting surface, the second mounting surface or the third mounting surface, and a limiting spring sheet located in the middle; the first positioning surface and the first mounting surface form a first mounting position in which the limiting spring sheet is parallel to the yz plane, the second positioning surface and the second mounting surface form a second mounting position in which the limiting spring sheet is parallel to the xz plane, and the third positioning surface and the third mounting surface form a third mounting position in which the limiting spring sheet is parallel to the xy plane.

5. The abnormal noise test bench with fast switching mode according to claim 1 is characterized by: The abnormal noise test bench also includes a transmission connecting rod, and the ends of the first transmission arm, the second transmission arm, the third transmission arm, the fourth transmission arm and the fifth transmission arm are all provided with fixed ends for installing the connecting rod.

6. The abnormal noise test bench with fast switching mode according to claim 1 is characterized by: The first elastic component includes a central axis and a first elastic block, the central axis includes a limit stop block arranged in the middle of the outer wall and a first sleeve portion located on the first side of the limit stop block, an axially through inner connecting hole is provided inside the central axis, a first matching hole that can match with the outer wall of the first sleeve portion is formed in the middle of the first elastic block; the first mounting portion / the second mounting portion is fixedly connected to the central axis through the inner connecting hole, and the end of the rod body is elastically abutted against the first elastic block.

7. The abnormal noise test bench with fast switching mode according to claim 6 is characterized by: The first limit member also includes two adjustment components arranged at both ends of the rod body, and the adjustment components include a connecting screw and an adjustment block. The connecting screw is coaxially arranged and fixedly connected to the rod body. A connecting screw hole that can be movably matched with the connecting screw is formed in the middle of the adjustment block, and the first elastic fast elastically abuts against the adjustment block.

8. The abnormal noise test bench with fast switching mode according to claim 1 is characterized by: The second elastic component includes a mounting shaft arranged in the z direction and fixedly connected to the base and an elastic sleeve sleeved and fixed on the outer periphery of the mounting shaft, and the lower connecting portion can be fixedly connected to the outer periphery of the elastic sleeve.

9. The abnormal noise test bench with fast switching mode according to claim 8, characterized in that: The extension arm includes a main connecting arm and two symmetrically arranged branch connecting arms, the first end of the main connecting arm is connected to the second elastic component, and the second end extends along an xz plane toward the extension platform, the branch connecting arm is connected to the second end of the main connecting arm and extends toward the platform, an angle is formed between the two branch connecting arms, and the third mounting portion includes two mounting areas corresponding to the branch connecting arms.

10. The abnormal noise test bench with fast switching mode according to claim 1, characterized in that: The base includes a vibration isolation base and a mounting base fixed on the upper side of the vibration isolation base. The vibration isolation base includes a column, a shock absorber arranged on the upper end of the column, a supporting body arranged above the shock absorber, and a vibration isolation pad arranged above the supporting body.

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