Body-in-white or part modal test bench

Abstract

The utility model provides a body-in-white or part modal test bench, which comprises a plurality of supporting units and at least one excitation unit, and is characterized in that each supporting unit comprises a base, a height adjusting unit which is fixedly arranged on the base and can adjust the height and fix the position, and an air spring fixedly arranged on the height adjusting unit; an upper cover plate of the air spring is provided with a stop block used for supporting a test sample piece and limiting transverse movement of the test sample piece, and the vibration excitation unit comprises a bottom frame, a supporting plate which is arranged on the bottom frame and can adjust the height and fix the position, and a vibration exciter fixedly arranged on the supporting plate; a force sensor is arranged at the front end of a vibration excitation rod of the vibration exciter, and the vibration excitation rod is in contact with the lower surface of the test sample through the force sensor to provide excitation for the test sample; the device is simple and stable in structure and efficient and convenient to operate, the height of the supporting system can be conveniently adjusted, and air inflation and air pressure adjustment can be conducted without disassembling the air spring.

Description

Technical Field

[0001] The utility model belongs to the field of test devices for automotive body-in-white or parts, and relates to a modal test bench for body-in-white or parts. Background Technique

[0002] With the continuous development of the social and economic level and the automotive industry, people's requirements for the driving and riding comfort of automobiles are getting higher and higher. Vibration and noise control are very important links affecting driving and riding comfort. Therefore, each automobile enterprise now attaches great importance to the development of NVH performance. Among them, modal testing is of great significance for the development of automotive NVH performance.

[0003] The modal test of the body-in-white or parts means that a certain vibration excitation is applied to the test sample by an exciter or a force hammer, the acceleration sensors arranged on the test sample collect vibration signals, and finally the data is analyzed by software to obtain parameters such as the natural frequency, vibration mode, and damping ratio of the test sample, providing an important reference basis for the R & D and design of automobiles, which can avoid resonance, optimize the NVH performance and fatigue life of automobiles, analyze and optimize the dynamic characteristics of the structure, diagnose and predict vibration faults, and verify the finite element model.

[0004] Modal testing requires a matching tooling bench to meet the boundary conditions of the free modal constraints of the test sample. When using an exciter for excitation, a matching tooling is also required to make the excitation system meet the requirements of the excitation position and excitation direction for modal testing. However, the existing various tooling benches are not efficient and convenient to use.

[0005] When conducting modal tests, currently in the industry, mainly two methods of suspension type and support type are used to simulate the free boundary conditions during testing.

[0006] For the suspension type testing method, the additional mass of the suspension device will affect the system mass of the test sample, and thus affect the test accuracy. Moreover, different body-in-whites of different vehicle models need to be matched with different suspension toolings, resulting in an increase in test costs and an extension of the test cycle.

[0007] For the support type testing method, currently, the disclosed technical solutions include, for example, the patent "Airbag Bracket System, Modal Testing System and Method" with the Chinese patent publication number CN115371928A. Since the height of the tooling bracket system needs to be adjusted according to different samples during testing, when adjusting the height of this solution, it is necessary to adjust the nuts and support plates at the upper and lower ends of 4 studs respectively, and the operation is relatively cumbersome, time-consuming and laborious.

[0008] Moreover, in some existing solutions, when inflating or adjusting the air pressure of the air spring, it is necessary to remove the air spring from the tooling bench, and then reinstall it, which is troublesome, time-consuming and laborious. There are also some solutions that do not require removing the air spring, but can only inflate and adjust the pressure when there is no sample loaded. When it is found that the air spring pressure is inappropriate after placing the sample, it is necessary to remove the sample to re-adjust the pressure, which is also cumbersome, time-consuming and laborious. Utility Model Content

[0009] In order to overcome the problems existing in the prior art, the present utility model provides a white body or component modal test bench.

[0010] The present utility model is implemented by adopting the following technical solutions:

[0011] A white body or component modal test bench, which is used to provide support and excitation for a test sample of a white body or component during a modal test. It includes a plurality of support units with adjustable axial elastic force for placing and supporting the test sample and at least one excitation unit for providing excitation to the test sample. The support unit includes a base, a height adjustment unit fixedly arranged on the base and capable of adjusting the height and fixing the position, and an air spring fixedly arranged on the height adjustment unit. A stopper for supporting the test sample and restricting the lateral movement of the test sample is arranged on the upper cover plate of the air spring. The excitation unit is arranged below the test sample. The excitation unit includes a bottom frame, a support plate arranged on the bottom frame and capable of adjusting the height and fixing the position, and an exciter fixedly arranged on the support plate. A force sensor is arranged at the front end of the excitation rod of the exciter, and the excitation rod contacts the lower surface of the test sample through the force sensor to provide excitation for the test sample.

[0012] The further technical solutions include:

[0013] The base is a plate-like structure. The height adjustment unit includes a hollow support tube and a lead screw. The lower end of the support tube is fixed on the base. A hollow fixed locking ring with internal threads is fixedly arranged at the upper end opening of the support tube. The middle and lower sections of the lead screw are threadedly connected with the fixed locking ring and then extend into the support tube. Rotating the lead screw to cooperate with the fixed locking ring drives the lead screw to move up and down axially in the support tube. A hollow movable locking ring is threadedly connected with the lead screw. Rotating the movable locking ring makes the movable locking ring move downward on the lead screw to the fixed locking ring and tighten to lock the lead screw and thus fix the height of the lead screw. A disc-shaped first support plate is fixedly arranged at the upper end of the lead screw. A second support plate is arranged with a gap above the first support plate. The lower cover plate of the air spring is fixedly connected with the second support plate. The air spring is fixedly arranged on the second support plate, and the L-shaped inflation valve extending downward from the air spring extends out through the gap between the first support plate and the second support plate.

[0014] There are multiple threaded mounting holes on the first support plate, and there are mounting through-holes on the second support plate that correspond one-to-one with the threaded mounting holes on the first support plate. A support column in the form of a hollow tubular structure is provided between each threaded mounting hole on the first support plate and the corresponding mounting through-hole on the second support plate above it. After a bolt passes through each mounting through-hole on the second support plate and the corresponding support column, it is threadedly connected to the threaded mounting hole on the first support plate corresponding to this mounting through-hole, thereby assembling the second support plate and the first support plate together.

[0015] The second support plate is fixedly connected to the lower cover plate of the air spring by bolts. An outer edge of the second support plate is provided with a U-shaped cutout that extends to the center of the second support plate and penetrates the thickness direction of the second support plate for the inflation valve of the air spring to pass through. The inflation valve of the air spring passes through the U-shaped cutout and is located between the first support plate and the second support plate. The valve port of the inflation valve extends outward, facilitating the use of the inflation valve to inflate and deflate the air spring to adjust the axial elastic force of the air spring.

[0016] The bottom frame is a rectangular frame. There is a stud with an external thread fixedly arranged upward at each of the four corner points at the top of the bottom frame. The four studs pass through the through-holes at the four corner points of the support plate, so that the support plate is sleeved on the four studs and can move up and down on the four studs. There are two fixing nuts at each corner point of the support plate. The two fixing nuts are respectively located above and below the support plate, and both fixing nuts are threadedly connected to the stud corresponding to this corner point. Rotating the two fixing nuts at each corner point clamps the support plate and thus fixes the height of the support plate.

[0017] The vibrator is rotatably connected to the vertical plates on both sides of the fork-shaped vibrator base through adjusting bolts on both sides. Loosening the adjusting bolts can rotate the vibrator to adjust the direction of the exciting force, and tightening the adjusting bolts can fix the angle of the vibrator. The horizontal plate at the bottom of the vibrator base is fixedly connected to the support plate by bolts.

[0018] A triangular block is fixedly arranged at the front end of the force sensor as an intermediate medium to contact the test specimen, so as to adjust the angle of contact with the test specimen.

[0019] A plurality of triangular reinforcing plates are fixedly arranged between the support pipe and the base at evenly spaced intervals.

[0020] The longitudinal section of the stop block is L-shaped. The horizontal part of the stop block is threadedly connected to the internal threaded hole of the upper cover plate of the air spring by bolts. The horizontal part of the stop block contacts the edge of the test specimen to limit the lateral movement of the test specimen.

[0021] Compared with the prior art, the beneficial effects of the present utility model are:

[0022] A body-in-white or component modal test bench provided by the utility model adopts a support structure and method to constrain the free boundary conditions of the body-in-white or component modal test, avoiding the mass of the lifting tool attached to the sample by the suspension test method, thereby improving the test accuracy. The test structure and method of the suspension test also need to match different suspension toolings according to the body-in-white of different vehicle models, while the utility model does not need to match the suspension tooling, reducing the test cost and shortening the test cycle.

[0023] Compared with the existing support type tooling bench, a body-in-white or component modal test bench provided by the utility model has a concise and stable structure and efficient and convenient operation. For example, the height of the support system can be conveniently adjusted, the air spring can be inflated and its air pressure can be adjusted without disassembling it, and the air spring can also be inflated and pressure-adjusted under the condition of loading the sample, so as to observe in real time whether the air spring pressure is appropriate. Description of the Drawings

[0024] The following further describes the utility model with reference to the drawings:

[0025] Figure 1 It is a schematic structural diagram of the axonometric angle of a body-in-white or component modal test bench provided by the utility model.

[0026] Figure 2 The front view of a body-in-white or component modal test bench provided by the utility model.

[0027] Figure 3 It is one of the schematic structural diagrams of the support unit in the utility model.

[0028] Figure 4 It is the second schematic structural diagram of the support unit in the utility model.

[0029] Figure 5 It is the schematic structural diagram of the excitation unit in the utility model.

[0030] In the figure: 1. Support unit, 2. Excitation unit, 3. Test sample, 4. Inflation valve, 5. U-shaped notch, 6. Reinforcing plate;

[0031] 11. Base, 12. Fixed locking ring, 13. Lead screw, 14. Movable locking ring, 15. First support plate, 16. Support column, 17. Second support plate, 18. Air spring, 19. Block, 20. Support pipe, 21. Bottom frame, 22. Stud, 23. Support plate, 24. Exciter base, 25. Exciter, 26. Adjusting bolt, 27. Excitation rod, 28. Force sensor, 29. Triangular block, 30. Fixed nut Detailed Implementation Modes

[0032] The present utility model will be described in detail below in conjunction with the accompanying drawings:

[0033] The present utility model provides a white body or component modal test bench, which is used to provide support and excitation for a test sample 3 of a white body or component during a modal test. In this embodiment, as Figure 1 and Figure 2 shown, it includes four support units 1 with adjustable axial elastic force for placing and supporting the test sample 3 and an excitation unit 2 for providing excitation to the test sample 3.

[0034] In this embodiment, as Figure 3 and Figure 4 shown, the support unit 1 includes a base 11, a height adjustment unit fixedly arranged on the base 11 and capable of adjusting the height and fixing the position, and an air spring 18 fixedly arranged on the height adjustment unit. A stopper 19 for supporting the test sample 3 and restricting the lateral movement of the test sample 3 is arranged on the upper cover plate of the air spring 18. The stopper 19 can prevent the test sample 3 from accidentally slipping off the air spring 18 and play a role in safety guarantee; the excitation unit 2 is arranged below the test sample 3. The excitation unit 2 includes a bottom frame 21, a support plate 23 arranged on the bottom frame 21 and capable of adjusting the height and fixing the position, and an exciter 25 fixedly arranged on the support plate 23. A force sensor 28 is arranged at the front end of the excitation rod 27 of the exciter 25. The excitation rod 27 contacts the lower surface of the test sample 3 through the force sensor 28 to provide excitation for the test sample 3.

[0035] In this embodiment, as Figure 3 and Figure 4As shown, the base 11 is a plate-like structure. The height adjustment unit includes a hollow support tube 20 and a lead screw 13. The lower end of the support tube 20 is fixed on the base 11. At the upper end opening of the support tube 20, a hollow fixed locking ring 12 with internal threads is fixedly arranged. The middle and lower sections of the lead screw 13 are threadedly connected to the fixed locking ring 12 and then extend into the support tube 20. Rotating the lead screw 13 causes the lead screw 13 to cooperate with the fixed locking ring 12 to drive the lead screw 13 to move up and down axially in the support tube 20. A hollow movable locking ring 14 with internal threads is threadedly connected to the lead screw 13. Rotating the movable locking ring 14 causes the movable locking ring 14 to move downward on the lead screw 13 to the fixed locking ring 12 and be tightened to lock the lead screw 13 and thus fix the height of the lead screw 13. A disc-shaped first support plate 15 is fixedly arranged at the upper end of the lead screw 13. A second support plate 17 is arranged with a gap above the first support plate 15. The lower cover plate of the air spring 18 is fixedly connected to the second support plate 17. The air spring 18 is fixedly arranged on the second support plate 17, and the L-shaped inflation valve 4 extending downward from the air spring 18 extends outward through the gap between the first support plate 15 and the second support plate 17. The gap between the first support plate 15 and the second support plate 17 is used to operate and install the air spring 18 and place the inflation valve 4 of the air spring 18, and the air spring 18 can be inflated and deflated to adjust the air pressure without disassembling the air spring 18 and the test specimen 3 of the load.

[0036] In this embodiment, as Figure 3 and Figure 4 shown, there are multiple threaded mounting holes on the first support plate 15, and there are mounting through holes on the second support plate 17 that correspond one-to-one to the threaded mounting holes on the first support plate 15. A hollow tubular support column 16 is arranged between each threaded mounting hole on the first support plate 15 and the corresponding mounting through hole on the second support plate 17 above it. A bolt passes through each mounting through hole on the second support plate 17 and the corresponding support column 16 and then is threadedly connected to the threaded mounting hole on the first support plate 15 corresponding to this mounting through hole, thereby assembling the second support plate 17 and the first support plate 15 together.

[0037] In this embodiment, as Figure 4 shown, the second support plate 17 is fixedly connected to the lower cover plate of the air spring 18 by bolts. An outer edge of the second support plate 17 is provided with a U-shaped notch 5 that extends to the center of the second support plate 17 and penetrates the thickness direction of the second support plate 17 for the inflation valve 4 of the air spring 18 to pass through. The inflation valve 4 of the air spring 18 passes through the U-shaped notch 5 and is located between the first support plate 15 and the second support plate 17, and the valve port of the inflation valve 4 extends outward, facilitating the use of the inflation valve 4 to inflate and deflate the air spring 18 to adjust the axial elastic force of the air spring 18.

[0038] In this embodiment, as Figure 5 shown, the bottom frame 21 is a rectangular frame. At each of the four corner points at the top of the bottom frame 21, there is a stud 22 with an external thread fixedly arranged upward. The four studs 22 pass through the through holes at the four corner points of the support plate 23, so that the support plate 23 is sleeved on the four studs 22 and can move up and down on the four studs 22. At each corner point of the support plate 23, there are two fixing nuts 30. The two fixing nuts 30 are respectively located above and below the support plate 23, and both of the two fixing nuts 30 are threadedly connected to the stud 22 corresponding to this corner point. By rotating the two fixing nuts 30 at each corner point, the support plate 23 is clamped and thus the height of the support plate 23 is fixed.

[0039] In this embodiment, as Figure 5 shown, the vibrator 25 is rotatably connected to the vertical plates on both sides of the fork-shaped vibrator base 24 through the adjusting bolts 26 on both sides. Loosening the adjusting bolts 26 enables the vibrator 25 to be rotated so as to adjust the direction of the exciting force. Tightening the adjusting bolts 26 can fix the angle of the vibrator 25. The horizontal plate at the bottom of the vibrator base 24 is fixedly connected to the support plate 23 through bolts.

[0040] In this embodiment, as Figure 5 shown, a triangular block 29 is fixedly arranged at the front end of the force sensor 28 as an intermediate medium to contact the test specimen 3, so as to adjust the angle of contact with the test specimen 3.

[0041] In this embodiment, as Figure 3 and Figure 4 shown, a plurality of triangular reinforcing plates 6 are fixedly arranged between the support pipe 20 and the base 11, which are evenly distributed at intervals.

[0042] In this embodiment, as Figure 3 and Figure 4 shown, the longitudinal section of the stop block 19 is L-shaped. The horizontal part of the stop block 19 is threadedly connected to the internal threaded hole of the upper cover plate of the air spring 18 through bolts. The horizontal part of the stop block 19 contacts the edge of the test specimen 3 to limit the lateral movement of the test specimen 3.

[0043] The working principle and working process of a body-in-white or component modal test bench provided by the present utility model are as follows:

[0044] According to different samples and tests, first adjust the support unit 1 to an appropriate height. The height of the support unit 1 can be adjusted by rotating the first support plate 15 to drive the lead screw 13. Then rotate the movable locking ring 14 to the fixed locking ring 12 at the lowest end and tighten it. At this time, the lead screw 13 is locked and cannot rotate, ensuring the stability of the entire system during the test. Then place the test sample 3 steadily on the 4 support units 1, with the support units 1 located at the 4 corners of the sample. Adjust the air pressure of the air spring 18 through the inflation valve 4 so that the pressure of the air spring 18 meets the free boundary conditions required by the modal test.

[0045] Move the excitation unit 2 to the excitation point position of the test sample 3. Adjust the support plate 23 and the adjusting bolt 26 to make the force sensor 28 on the exciter 25 accurately fit the excitation point position of the sample and ensure that the direction of the excitation force meets the test requirements. Finally, bond the force sensor 28 to the excitation point position of the test sample 3 with glue.

[0046] In some embodiments, if the angle between the exciter 25 and the excitation point position of the test sample 3 is difficult to adjust, a triangular block 29 can be used as an intermediate medium. By coordinating the height adjustment of the support unit 1 and the height adjustment of the excitation unit 2, the direction of the excitation force can meet the test requirements.

[0047] In some embodiments, such as the white body modal, two excitation units 2 are used and arranged at the diagonal longitudinal beams of the white body respectively for excitation.

[0048] In some embodiments, the excitation unit 2 can be removed and a force hammer can be directly used to excite the test sample 3.

Claims

1. A body-in-white or component modal test bench, used for providing support and excitation to a test sample (3) of a body-in-white or component when performing a modal test on the test sample (3), characterized in that: The invention comprises a plurality of support units (1) with adjustable axial elastic force for placing and supporting a test sample (3) and at least one excitation unit (2) for providing excitation to the test sample (3), wherein the support unit (1) comprises a base (11), a height adjustment unit fixedly arranged on the base (11) and capable of adjusting the height and fixing the position, and an air spring (18) fixedly arranged on the height adjustment unit, wherein a stopper for supporting the test sample (3) and limiting the lateral movement of the test sample (3) is arranged on the upper cover plate of the air spring (18). The block (19) is provided with an excitation unit (2) below the test sample (3), the excitation unit (2) comprising a bottom frame (21), a support plate (23) arranged on the bottom frame (21) and capable of adjusting the height and fixing the position, and an exciter (25) fixed on the support plate (23), a force sensor (28) being arranged at the front end of an excitation rod (27) of the exciter (25), and the excitation rod (27) contacts the lower surface of the test sample (3) through the force sensor (28) to provide excitation for the test sample (3).

2. A body-in-white or component modal test bench according to claim 1, characterized in that: The base (11) is a plate-like structure. The height adjustment unit comprises a hollow support tube (20) and a lead screw (13). The lower end of the support tube (20) is fixed on the base (11). A hollow fixed locking ring (12) with an internal thread is fixedly arranged at the upper end of the support tube (20). The middle and lower sections of the lead screw (13) are threadedly connected with the fixed locking ring (12) and then extend into the support tube (20). The lead screw (13) is rotated so that the lead screw (13) cooperates with the fixed locking ring (12) to drive the lead screw (13) to rise and fall axially in the support tube (20). A hollow movable locking ring (14) with an internal thread is threadedly connected with the lead screw (13). The movable locking ring (14) is rotated to rotate. The ring (14) enables the movable locking ring (14) to move downward on the lead screw (13) to the fixed locking ring (12) and be tightened to lock the lead screw (13) and thereby fix the height of the lead screw (13); a disc-shaped first support plate (15) is fixedly arranged at the upper end of the lead screw (13); a second support plate (17) is arranged in the gap above the first support plate (15); a lower cover plate of the air spring (18) is fixedly connected to the second support plate (17); the air spring (18) is fixedly arranged on the second support plate (17); and an L-shaped inflation valve (4) of the air spring (18) extending downward extends outward from the gap between the first support plate (15) and the second support plate (17).

3. A body-in-white or component modal test bench according to claim 2, characterized in that: The first support plate (15) has a plurality of threaded mounting holes, and the second support plate (17) has mounting through holes corresponding to the threaded mounting holes on the first support plate (15) one by one. A support column (16) with a hollow tubular structure is provided between each threaded mounting hole on the first support plate (15) and the corresponding mounting through hole on the second support plate (17) above it. Each mounting through hole on the second support plate (17) has a bolt that passes through the mounting through hole and the support column (16) corresponding to the mounting through hole and is then threadedly connected to the threaded mounting hole on the first support plate (15) corresponding to the mounting through hole, thereby assembling the second support plate (17) and the first support plate (15) together.

4. A body-in-white or component modal test bench according to claim 3, characterized in that: The second support plate (17) is fixedly connected to the lower cover plate of the air spring (18) by bolts. The outer edge of the second support plate (17) is provided with a U-shaped cutout (5) extending to the center of the second support plate (17) and penetrating the thickness direction of the second support plate (17) for the air filling valve (4) of the air spring (18) to pass through. The air filling valve (4) of the air spring (18) passes through the U-shaped cutout (5) and is located between the first support plate (15) and the second support plate (17). The valve port of the air filling valve (4) extends outward, so that the air filling valve (4) can be used to inflate and deflate the air spring (18) to adjust the axial elastic force of the air spring (18).

5. A body-in-white or component modal test bench according to any one of claims 1 to 4, characterized in that: The bottom frame (21) is a rectangular frame. The four corner points of the top of the bottom frame (21) each have a stud (22) with an external thread fixed upwardly arranged. The four studs (22) pass through the through holes at the four corner points of the support plate (23) so that the support plate (23) is mounted on the four studs (22) and can move up and down on the four studs (22). Each corner point of the support plate (23) has two fixing nuts (30). The two fixing nuts (30) are respectively located above and below the support plate (23) and the two fixing nuts (30) are threadedly connected to the studs (22) at the corresponding corner points. The two fixing nuts (30) at each corner point are rotated to clamp the support plate (23) and thus fix the height of the support plate (23).

6. A body-in-white or component modal test bench according to claim 5, characterized in that: The vibrator (25) is rotatably connected to the vertical plates on both sides of the fork-shaped vibrator base (24) through adjusting bolts (26) on both sides. By loosening the adjusting bolts (26), the vibrator (25) can be rotated to adjust the direction of the exciting force. By tightening the adjusting bolts (26), the angle of the vibrator (25) can be fixed. The horizontal plate at the bottom of the vibrator base (24) is fixedly connected to the support plate (23) through bolts.

7. A body-in-white or component modal test bench according to claim 6, characterized in that: A triangular block (29) is fixedly arranged at the front end of the force sensor (28) as an intermediate medium to contact the test sample (3) so as to adjust the contact angle with the test sample (3).

8. A body-in-white or component modal test bench according to any one of claims 1 to 4, characterized in that: A plurality of triangular reinforcement plates (6) evenly spaced are fixedly arranged between the support tube (20) and the base (11).

9. A body-in-white or component modal test bench according to any one of claims 1 to 4, characterized in that: The longitudinal cross section of the stopper (19) is L-shaped, and the horizontal portion of the stopper (19) is threadedly connected to the internal threaded hole of the upper cover plate of the air spring (18) through a bolt, and the horizontal portion of the stopper (19) contacts the edge of the test sample (3) to limit the lateral movement of the test sample (3).

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