A noise test bench with fast switching modes

Abstract

The present invention provides a noise test bench with a fast switching mode, comprising a base, a first test unit, a second test unit, and a power unit disposed between the first and second test units; the power unit includes two exciters arranged in the y-direction; the first test unit can cause the component under test to vibrate in the x, y, and z directions with single degrees of freedom, while the second test unit can cause the component to vibrate in the pitch and roll directions with compound degrees of freedom. The present invention can use the same power unit to drive the first and second test units, respectively. Mode switching requires only moving the component under test a short distance, and both test modes utilize the same power unit. During the second half of the test, since the relevant parameters between the component under test and the power unit have already been acquired in the first half, debugging time between the component and the power unit is significantly reduced, thereby improving test efficiency.

Description

Technical Field

[0001] The present 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, abnormal vehicle noise has received increasing attention. As we all know, cars are assembled from a number of parts, and abnormal component noise is an important part of the overall vehicle noise. Nowadays, major parts and vehicle manufacturers pay close attention to abnormal component noise, often relying on testing methods to determine whether a component has abnormal noise.

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

[0004] The test bench used to test component abnormal noise and performance risks is called a component abnormal noise vibration test bench system. This test bench is required to simulate all degrees of freedom of real vehicle movement. In order to achieve multi-degree-of-freedom simulation, power sources from multiple directions are required. In existing testing schemes, abnormal noise testing includes single-degree-of-freedom testing and compound-degree-of-freedom testing. In single-degree-of-freedom testing, the object under test undergoes unidirectional vibration in the horizontal or vertical direction. In compound-degree-of-freedom testing, the object under test undergoes rotational vibration formed by a combination of multi-directional motion. In the two degree-of-freedom test modes, the abnormal noise detection equipment needs to have different transmission structures to provide different modes of excitation force. Therefore, the mode switching process involves the transfer of the tested component between different test benches or the modification of the test bench structure itself, which is time-consuming and labor-intensive, affecting test efficiency. Summary of the Invention

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

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] 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;

[0008] The power device comprises two vibrators arranged in the y direction;

[0009] 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 limit member, 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 a third connecting surface 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 movably hinged to the base and limited in the y direction, the first base is connected to 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 be connected is provided between the first transmission arm and the first connecting surface, a second corresponding structure that can be connected is provided between the second transmission arm and the second connecting surface, and a third corresponding structure that can be connected is provided between the first driving arm and the exciter;

[0010] The second test unit includes 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 z-direction bottom of the second movable platform is provided with a second mounting portion, and an x-direction side edge of the second movable platform is provided with a third mounting portion, the roll limiter includes 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 component; the pitch limiter includes a mounting seat and an extension arm, the mounting seat includes 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 part 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 parts arranged in the y direction, and the third transmission part 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 form a connection is provided between the fifth transmission arm and the z-direction bottom of the second movable platform, and a fifth corresponding structure that can form a connection is provided between the second driving arm and the exciter.

[0011] 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.

[0012] It should also be noted that the "x-direction extension" mentioned in the present invention refers to the presence 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. The same applies to "y-direction extension" and "z-direction extension".

[0013] Furthermore, 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, and 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 form a connection is provided between the third transmission arm and the second transmission arm, and a seventh corresponding structure that can form a connection is provided between the fourth transmission arm and the third connecting surface.

[0014] 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.

[0015] Furthermore, the third mounting portion is arranged on a side close to the first connecting surface.

[0016] Furthermore, the first movable platform includes a plurality of connecting blocks, the first support 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 that can be connected to the first positioning surface, the second positioning surface or the third positioning surface, a second connecting portion located at the second end that can be connected to the first mounting surface, the second mounting surface or the third mounting surface, and a limiting spring located in the middle; the first positioning surface and the first mounting surface form a first mounting position that allows the limiting spring to be parallel to the yz plane, the second positioning surface and the second mounting surface form a second mounting position that allows the limiting spring to be parallel to the xz plane, and the third positioning surface and the third mounting surface form a third mounting position that allows the limiting spring to be parallel to the xy plane.

[0017] Furthermore, 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 end heads for installing the connecting rod.

[0018] Furthermore, the first elastic component includes a central axis and a first elastic block, the central axis includes a limit block arranged in the middle of the outer wall and a first sleeve portion located on the first side of the limit block, the interior of the central axis is provided with an axially penetrating internal connecting hole, the middle part of the first elastic block forms a first matching hole that can match with the outer wall of the first sleeve portion; the first mounting portion / the second mounting portion is fixedly connected to the central axis through the internal connecting hole, and the end of the rod body elastically abuts against the first elastic block.

[0019] 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, and 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 block elastically abuts against the adjustment block.

[0020] 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.

[0021] 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, and 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.

[0022] Furthermore, the base includes a vibration isolation base and a mounting base fixed to the upper side of the vibration isolation base. The vibration isolation base includes a column, a shock absorber arranged at the upper end of the column, a support body arranged above the shock absorber, and a vibration isolation pad arranged above the support body.

[0023] In summary, the application of the present invention can achieve the following beneficial effects:

[0024] 1. The present invention can respectively drive the first test unit and the second test unit 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 composite vibration on the xz plane or roll composite vibration on the yz plane. When performing mode conversion, it is only necessary to transfer the tested components between the first movable platform and the second movable platform over a short distance. There is no need to transfer the tested components over long distances between multiple devices, nor is there any need to modify the equipment to meet the requirements of different test modes, which saves preparation time between different test modes and improves test efficiency.

[0025] 2. The two test modes of the present invention use the same set of power devices. During 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.

[0026] 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.

[0027] 4. The present invention provides 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, thereby improving the accuracy of abnormal sound testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the structure of the abnormal noise test bench in the fast switching mode in the embodiment;

[0029] Figure 2 for Figure 1 A top view of

[0030] Figure 3 is a structural schematic diagram of the first transmission mechanism;

[0031] Figure 4 It is a structural diagram of the connection block and the installation block;

[0032] Figure 5 Schematic diagram of the elastic limiter and its installation structure;

[0033] Figure 6 Schematic diagram of the structure of the first movable platform;

[0034] Figure 7 Schematic diagram of the structure of the roll limiter;

[0035] Figure 8 Exploded view of the first elastic component

[0036] Figure 9 Schematic diagram of the structure of the pitch limiter;

[0037] Figure 10 is a structural diagram of the base;

[0038] In the picture:

[0039] 1-base, 11-mounting base, 12-column, 13-shock absorber, 14-support base, 15-vibration isolation pad;

[0040] 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 piece, 22a - first mounting position, 22b - second mounting position, 22c - third mounting position;

[0041] 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;

[0042] 4-first transmission mechanism, 41-first transmission member, 411-first base, 412-first driving arm, 4121-first driving connector, 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;

[0043] 5-second support frame, 51-first mounting portion;

[0044] 6-second movable platform, 61-second mounting portion, 62-transmission connecting block, 63-third mounting portion;

[0045] 7-second transmission mechanism, 71-third transmission member, 711-third base, 712-second driving arm, 7121-second driving connector, 713-fourth transmission arm;

[0046] 8 - roll limiter, 81 - rod, 82 - first elastic component, 821 - central axis, 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 - adjustment block;

[0047] 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;

[0048] 10-power device, 101-vibration output rod. DETAILED DESCRIPTION

[0049] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0050] 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

[0051] Reference Figures 1 to 10 The present invention provides a noise test bench with a fast switching mode, which includes a base 1, a first test unit and a second test unit installed above the base, a power device 10 installed between the first test unit and the second test unit, the first test unit is used to make the tested component vibrate unidirectionally in the x, y, and z directions respectively, and the second test unit is used to make the tested component swing in the xz and yz planes.

[0052] 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 number of parallel groove-shaped silencer grooves and a number of mounting base holes. The mounting base plate is fixedly connected to the vibration isolation pad through the mounting base holes. The mounting base plate is used to provide mounting sites for other mechanisms.

[0053] The power device 10 includes two vibrators arranged in the Y direction, and each vibrator is provided with a vibration output rod 101 .

[0054] The first testing unit includes a first support frame 2, a first movable platform 3 and a first driving mechanism 4;

[0055] 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 in the y-direction are provided on the first connecting surface, two docking blocks with z-direction connecting holes arranged in 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 each connecting block has a first positioning surface 351, a second positioning surface 352, and a third positioning surface 353.

[0056] 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 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 test errors caused by irrelevant vibrations;

[0057] 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, 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 is detachably connected to the first driving connector 4121, 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, 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.

[0058] 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;

[0059] 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;

[0060] 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. A third mounting portion 63 is provided on one side of the second movable platform in the x direction. The third mounting portion is located on the side close to the first connection surface.

[0061] The second transmission mechanism 7 includes two third transmission members 71 arranged in the y direction, and the third transmission member includes a third base 711 located in the middle. The third base is connected to 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 to the second driving connector 7121. The second driving end is arranged in the z direction with the first driving end. The second driving end can be fixedly connected to the excitation output rod. The end of the fifth transmission arm is also provided with a fixed end, which can be connected to the transmission connecting block 62 through the transmission connecting rod 43, so that the movement of the fifth transmission arm acts on the second movable platform. The third base 711 is hinged to 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;

[0062] The roll limiter 8 includes a rod body 81 and first elastic components 82 provided at both ends of the rod body, the first elastic component abutting against the rod body through an adjusting component, the first elastic component including a central axis 821, a first elastic block 822 and a second elastic block 823, the interior of the central axis forming an internal connection hole passing through along the axis, a limit stopper 8211 is provided at the middle portion 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 includes 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 internal connection hole;

[0063] The pitch limiter 9 includes a mounting seat 91 and an extension arm 92, the mounting seat includes a base 911 and a second elastic component 912 arranged on the base, the second elastic component includes a mounting shaft 9121 arranged in the z direction and an elastic sleeve 9122 fixedly sleeved on the outer periphery of the mounting shaft, the extension arm includes a main connecting arm 921 and a branch connecting arm 922, the lower end of the main connecting arm forms a lower connecting portion 923 sleeved and fixed with the second elastic component, 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.

[0064] The working principle of this embodiment is as follows:

[0065] Single degree of freedom vibration test: First, connect the two first drive arms to the two exciters. When an 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 x-direction exciting force to the first movable platform. When a 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 a z-direction exciting force to the first movable platform. When a 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 a y-direction exciting force to the first movable platform.

[0066] 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, and the two third transmission members provide periodic z-direction thrusts to the two sides of the platform in the y-upward direction in turn, so that the two sides of the platform in the y-upward direction will vibrate up and down in turn. 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 part or the second mounting part through the first elastic part. Between the rod body and the first mounting part, the rod body can rotate on the yz plane with the first elastic part as the center. Between the rod body and the platform, the platform can rotate on the yz plane with the first elastic part 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 worktable, causing the second movable table to undergo periodic lifting and lowering vibrations. The pitch limiter provided in the present invention limits one x-direction side of the worktable, and the second limiter can utilize the deformation of the elastic sleeve to rotate on any axial section of the mounting axis with the mounting axis as the center, but cannot undergo independent 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 worktable and the second limiter will rotate on the xz plane with the mounting axis as the center after being subjected to the z-direction exciting force.

[0067] 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, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or 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 scope of protection of the present invention.

Claims

1. A fast switching mode abnormal noise test bench, characterized by: The tester comprises a base, a first test unit, a second test unit, and a power device disposed between the first test unit and the second test unit, wherein 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 limit member, 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 a third connecting surface 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 movably hinged to the base and limited in the y direction, the first base is connected to 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 be connected is provided between the first transmission arm and the first connecting surface, a second corresponding structure that can be connected is provided between the second transmission arm and the second connecting surface, and a third corresponding structure that can be connected is provided between the first driving arm and the exciter; The second test unit includes 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 z-direction bottom of the second movable platform is provided with a second mounting portion and two transmission connection portions arranged in the y-direction, and an x-direction side edge of the second movable platform is provided with a third mounting portion, the roll limiter includes 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 component; the pitch limiter includes a mounting seat and an extension arm, the mounting seat includes a base fixedly connected to the base and a third mounting portion provided 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 rapid switching mode abnormal noise test bench according to claim 1, characterized in that: 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.

3. The fast switching mode abnormal noise test bench 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 fast switching mode abnormal noise test bench according to claim 1, characterized in that: The first movable platform includes several connecting blocks, the first supporting frame includes a mounting 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 that can be connected to the first positioning surface, the second positioning surface or the third positioning surface, a second connecting portion located at the second end that can be connected to the first mounting surface, the second mounting surface or the third mounting surface, and a limiting spring located in the middle; the first positioning surface and the first mounting surface form a first mounting position that allows the limiting spring to be parallel to the yz plane, the second positioning surface and the second mounting surface form a second mounting position that allows the limiting spring to be parallel to the xz plane, and the third positioning surface and the third mounting surface form a third mounting position that allows the limiting spring to be parallel to the xy plane.

5. The fast switching mode abnormal noise test bench according to claim 1, characterized in that: 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 fast switching mode abnormal noise test bench according to claim 1, characterized in that: The first elastic component includes a central axis and a first elastic block. The central axis includes a limit block arranged in the middle of the outer wall and a first sleeve portion located on a first side of the limit block. An axially penetrating 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 elastically abuts against the first elastic block.

7. The fast switching mode abnormal noise test bench according to claim 1, characterized in that: 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.

8. The abnormal noise test bench with fast switching mode according to claim 7, 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, forming an angle between the two branch connecting arms, and the third mounting portion includes two mounting areas corresponding to the branch connecting arms.

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

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