Vehicle body excitation device and whole vehicle excitation method

Abstract

The invention provides a vehicle body excitation device. The vehicle body excitation device comprises a mounting base, a power mechanism, a transmission assembly and a butt joint assembly. The power mechanism comprises a mounting frame fixedly connected with the base and a vibration exciter connected with the mounting frame; the transmission assembly comprises a transmission force arm and a hinge seat, the hinge seat is fixedly connected with the base, a hinge base part which is connected with the hinge seat and is limited in the y direction is formed in the middle of the transmission force arm, and the hinge base part is connected with a first force arm extending in the direction of the vibration exciter and a second force arm extending in the x direction. The first force arm is in transmission connection with the vibration exciter; the butt joint assembly comprises a connecting base block fixedly connected with the second force arm and a butt joint end fixedly connected with the connecting base block and arranged in the z direction. According to the invention, excitation force conduction is carried out through the lever principle, the transmission structure is relatively simple, and compared with a hydraulic excitation module in the prior art, less interference noise can be generated, the abnormal sound detection result is more accurate, and the upper limit of excitation frequency is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle abnormal noise detection, and in particular to a vehicle body excitation device and a whole vehicle excitation method. Background Art

[0002] Abnormal noise refers to non-steady-state noises such as buzz, squeak and rattle emitted by vehicles stimulated by the road surface. Such annoying abnormal noises in the car often indicate quality problems of the vehicle or its parts. Investigations and studies have found that a large number of complaints from car owners come from abnormal noises caused by the vehicle body and interior. Therefore, vehicle manufacturers usually conduct vehicle abnormal noise tests to discover, analyze and determine the root causes of abnormal noises to the greatest extent possible and eliminate such non-steady-state noises, so as to improve product quality and customer satisfaction.

[0003] In the prior art, the whole vehicle abnormal noise test is generally carried out through a four-channel vehicle test bench, which has four hydraulic excitation modules that can vibrate up and down. During the test, each hydraulic excitation module supports a wheel, and the whole vehicle abnormal noise test can be carried out by inputting the corresponding road simulation parameters into the hydraulic excitation module. The hydraulic excitation module structure of this test method is relatively complex and costly, and the four hydraulic support modules bear the entire weight of the vehicle. The interference noise during the test process is relatively large, which can easily cover up some relatively weak abnormal noises. Summary of the invention

[0004] In order to solve the above problems, the present invention discloses a vehicle body excitation device and a whole vehicle abnormal noise test bench. The vehicle body excitation device and its auxiliary system have a simpler structure, lower cost and better operability than the existing hydraulic excitation module, and less interference noise during operation, which has less impact on abnormal noise analysis.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A vehicle body excitation device comprises a mounting base, a power mechanism, a transmission assembly and a docking assembly; the power mechanism comprises a mounting frame fixedly connected to the base and an exciter connected to the mounting frame; the transmission assembly comprises a transmission force arm and an articulated seat, the articulated seat is fixedly connected to the base, a hinged base connected to the articulated seat and limited in the y direction is formed in the middle of the transmission force arm, the articulated base is connected to a first force arm extending in the direction of the exciter and a second force arm extending in the x direction, the first force arm is in transmission connection with the exciter; the docking assembly comprises a connecting base block fixedly connected to the second force arm and a docking end head fixedly connected to the connecting base block and arranged in the z direction.

[0006] Furthermore, the vehicle body excitation device also includes an elastic limiter, which includes a spring sheet and a first positioning portion and a second positioning portion arranged at both ends of the spring sheet, the first positioning portion and the second positioning portion are respectively fixedly connected to the base and the connecting base block and make the spring sheet arranged perpendicular to the z direction.

[0007] Furthermore, the elastic limiting component includes a first spring sheet and a second spring sheet which are parallel to each other and arranged in the z direction, the first ends of the first spring sheet and the second spring sheet are integrally connected through a first positioning portion, the second ends of the first spring sheet and the second spring sheet are each provided with a second connecting portion, and the mounting base is provided with a first matching portion corresponding to the first spring sheet and a second matching portion corresponding to the second spring sheet.

[0008] Furthermore, the length of the first lever arm is greater than that of the second lever arm.

[0009] Furthermore, the hinge seat includes an elastic hinge plate and a first end block and a second end block respectively fixed at both ends of the elastic hinge plate, the first end block and the second end block are respectively fixedly connected to the mounting base and the connecting base block, and the elastic hinge plate includes a first hinge plate and a second hinge plate parallel to the y direction and perpendicular to each other.

[0010] Furthermore, the intersection line of the plane where the first hinge piece is located and the plane where the second hinge piece is located is recorded as the hinge axis, and the first hinge piece coincides with the position of the second hinge piece after rotating 90° around the hinge axis.

[0011] Furthermore, the docking assembly includes an installation guide rod extending in the z direction, an adjustment frame and a locking member, the connecting base block has a guide hole arranged in the z direction and matching with the lower end of the installation guide rod, the adjustment frame is sleeved with the upper end of the installation guide rod, and the locking member can be fixedly connected to the outer periphery of the installation guide rod.

[0012] Furthermore, the adjustment frame includes an upper base plate, a lower base plate and a support plate, the upper base plate and the lower base plate are parallel to each other, the two ends of the support plate are respectively vertically connected to the edge of the upper base plate and the edge of the lower base plate, the lower base plate is provided with an adjustment hole for the installation guide rod to pass through, and the docking end is fixedly connected to the upper base plate.

[0013] Furthermore, the vehicle body excitation device also includes an airbag assembly, which includes an installation frame and a first airbag and a second airbag arranged inside the installation frame. The end of the first force arm is connected to an extension part, and the first airbag and the second airbag are respectively abutted against both sides of the movement direction of the extension part.

[0014] The present invention also provides a whole vehicle excitation method based on the above vehicle body excitation device, comprising the following steps: a. A base is provided, wherein the upper side of the base has a horizontal mounting surface, and a number of wheel alignment platforms corresponding to the number of wheels of the vehicle to be tested are fixed on the horizontal mounting surface according to the structure of the vehicle to be tested, and the upper end of the wheel alignment platform has an arc-shaped table surface for placing wheels; b. at least one excitation group is fixedly mounted on the horizontal mounting surface, each excitation group comprising two vehicle body excitation devices symmetrically arranged about the longitudinal center line of the wheel alignment station; c. Place each wheel of the vehicle to be tested on the corresponding wheel alignment platform; d. A process hole facing downward in the z direction is provided at the bottom of the door sill beam of the vehicle to be tested, and the docking end of the vehicle body excitation device is adjusted so that the process hole of the docking end is aligned in the z direction and fixedly connected; e. Start the vehicle body excitation device to apply synchronous z-axis excitation to the vehicle to be tested, thereby achieving whole vehicle excitation.

[0015] The application of the present invention can achieve the following beneficial effects: 1. The present invention drives the butt joint end of the transmission arm to vibrate in the z direction through the exciter, so that the vehicle body structure connected to the butt joint end is vibrated in the z direction. During the vehicle body excitation process, the vehicle is placed on the wheel alignment platform, and its main weight is borne by the wheel alignment platform. The butt joint end only needs to provide corresponding excitation force without bearing the weight of the whole vehicle like the hydraulic excitation module in the prior art. Therefore, the thrust requirement for the exciter is lower, which reduces the equipment cost. At the same time, it can also provide a higher excitation frequency to achieve more comprehensive abnormal sound detection.

[0016] 2. The present invention conducts exciting force through the lever principle, and the transmission structure is relatively simple. Compared with the hydraulic excitation module in the prior art, it can generate less interference noise, and the abnormal sound detection result is more accurate.

[0017] 3. Some embodiments of the present invention also use elastic limiters to limit the docking assembly, so that the docking assembly can vibrate along the z-direction as much as possible, reduce the interference caused by vibration errors, and ensure the accuracy of the test results.

[0018] 4. Some embodiments of the present invention provide installation guide rods and adjustment frames to change the height position of the docking end, so that the docking end can be quickly docked with the process hole on the bottom of the vehicle body, and the z-direction orientation of the docking end will not be changed during the adjustment of the docking end. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of a vehicle body vibration excitation device in an embodiment; Figure 2 is a schematic diagram of the structure of the transmission component; Figure 3 is a structural schematic diagram of a docking assembly; Figure 4 It is a structural schematic diagram of an elastic limiting member; Figure 5 It is a structural schematic diagram of a whole vehicle abnormal noise test bench; In the figure, 1-mounting base, 2-power mechanism, 21-mounting frame, 22-vibrator, 3-transmission assembly, 31-transmission arm, 311-hinge base, 312-first force arm, 313-second force arm, 314-extension portion, 32-hinge seat, 321-first end block, 322-second end block, 323-first hinge plate, 324-second hinge plate, 4-docking assembly, 41-connecting base block, 411-second A mating part, 412-a second mating part, 413-a guide hole, 42-a docking end, 43-a mounting guide rod, 44-an adjusting frame, 441-an upper base plate, 442-a lower base plate, 4221-an adjusting hole, 443-a supporting plate, 45-a locking member, 5-an elastic limiting member, 6-an airbag assembly, 7-a base, 8-a wheel alignment platform, 81-a curved table top, a1-a first vehicle body excitation device, a2-a second vehicle body excitation device. DETAILED DESCRIPTION

[0020] 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. Example

[0021] Reference Figures 1 to 4 The embodiment of the first aspect of the present invention provides a vehicle body vibration excitation device, which includes a mounting base 1, a power mechanism 2, a transmission assembly 3 and a docking assembly 4, specifically: The mounting base 1 has a number of mounting sites for providing an assembly basis for other mechanisms; The power mechanism 2 includes a mounting frame 21 and a vibration exciter 22, wherein the mounting frame is fixedly connected to the mounting base, and the vibration exciter is connected to the mounting frame and has its output end facing downward in the z direction, so as to output the exciting force; The transmission assembly 3 includes a transmission arm 31 and an articulated seat 32; the transmission arm has an articulated base 311 formed in the middle thereof, which is connected to the articulated seat and limited in the y direction. Under the guidance and limitation of the articulated seat, the articulated base cannot move in the y direction and can only rotate in the xz plane. The articulated base is connected with a first force arm 312 extending toward the first side of the x direction and a second force arm 313 extending toward the second side of the x direction. The first force arm gradually approaches the exciter in the extension direction and is fixedly connected to the output end of the exciter, so that the output end can drive the first force arm The end portion vibrates in the z direction, and then under the guidance and restriction of the articulated seat, the entire transmission force arm is transmitted along the xz plane. At this time, the end portion of the second force arm will vibrate in the z direction in the opposite direction to the end portion of the first force arm. Usually, the length of the first force arm is greater than the second force arm. On the one hand, the lever principle is used to amplify the thrust output by the exciter when it acts on the vehicle, thereby reducing the equipment requirements. On the other hand, the amplitude of the vehicle is reduced by a certain proportion relative to the exciter. When the amplitude of the exciter is adjusted, the amplitude change of the vehicle is relatively small, which is convenient for fine-tuning the amplitude of the vehicle. The docking assembly 4 includes a connecting base block 41 and a docking terminal 42. The connecting base block is fixedly connected to the end of the second force arm, so that the second force arm can drive the connecting base block to vibrate in the z direction. The docking terminal is fixed to the upper side of the connecting base block and its own axis is arranged along the z direction, so that the vehicle body structure connected to the docking terminal can be subjected to the exciting force in the z direction, thereby realizing vehicle body excitation.

[0022] An embodiment of the present invention further provides a specific structure of the hinge seat 32. In this embodiment, the hinge seat includes an elastic hinge plate located in the middle, and the two ends of the elastic hinge plate are respectively fixedly connected with a first end block 321 and a second end block 322. The first end block and the second end block are respectively fixedly connected to the mounting base 1 and the hinge base 311. The elastic hinge plate includes a first hinge plate 323 and a second hinge plate 324 that are arranged perpendicular to each other. The intersection line of the plane where the first hinge plate is located and the plane where the second hinge plate is located is recorded as the hinge axis. The first hinge plate can overlap with the second hinge plate after rotating 90° around the hinge axis. Figure 2In this embodiment, the first hinge piece is arranged perpendicular to the x-direction, and the second hinge piece is arranged perpendicular to the z-direction. The first end block and the second end block are respectively provided with a first recess and a second recess for installing the elastic hinge piece. The first recess has a first corresponding surface perpendicular to the x-direction and a first corresponding surface perpendicular to the z-direction. The second recess has a third corresponding surface perpendicular to the x-direction and a fourth corresponding surface perpendicular to the z-direction. The two ends of the first hinge piece are respectively attached to the first corresponding surface and the third corresponding surface and fixed by screws. The two ends of the second hinge piece are respectively attached to the second corresponding surface and the fourth corresponding surface and fixed by screws. Due to the structural characteristics of the first hinge piece and the second hinge piece, the second end The z-direction translation and x-direction translation of block 322 are respectively limited by the resistance of the first hinge and the second hinge, while the y-direction translation is limited by the resistance of the first hinge and the second hinge at the same time. However, when the second end block rotates around the hinge axis, the first hinge and the second hinge can undergo a certain torsional deformation. Therefore, when the first force arm is driven by the exciter, the hinge base can rotate around the hinge axis. In a more specific embodiment, the first hinge or the second hinge is formed by stacking a plurality of elastic metal sheets, so that the first hinge or the second hinge has a certain rigidity to resist the translation of the second end block, while retaining a certain elasticity to cooperate with the rotation of the second end block.

[0023] An embodiment of the present invention further provides a specific structure of the docking assembly 4, referring to Figure 3In this embodiment, the docking assembly 4 also includes a mounting guide rod 43, an adjustment frame 44 and a locking member 45. The upper side of the connecting base block 41 is provided with a guide hole 413 that passes through in the z direction. The mounting guide rod cooperates with the guide hole along the z direction, and a locking member 45 sleeved on the outer periphery of the mounting guide rod is used to relatively fix the mounting guide rod and the adjusting frame is sleeved with the mounting guide rod and can move up and down along the mounting sleeve rod. Another locking member fixes the adjusting frame and the mounting guide rod relatively. The docking end 42 is arranged at the upper end of the adjusting frame. When necessary, the corresponding locking member can be loosened so that the adjusting frame can slide along the mounting guide rod in the z direction. After sliding to a suitable position, it is fixed by the locking member to achieve height adjustment of the docking end. In a further embodiment, the adjustment frame includes an upper base plate 441, a lower base plate 442 and two support plates 443, the upper base plate and the lower base plate are arranged parallel to the xy plane, the upper and lower ends of the support plate are respectively vertically connected to the side edges of the upper base plate and the lower base plate, the two support plates are parallel to each other and are respectively located on both sides, a number of hollow holes are arranged on the support plate, the lower base plate is provided with a through adjustment hole 4221, the docking end 42 is fixedly connected to the upper side of the upper base plate, and a certain space is left between the upper base plate and the lower base plate for the relative movement of the guide rod. The above structure enables the adjustment frame itself to have a certain deformation elasticity through the support plate to adapt to various force changes during the z-direction vibration process.

[0024] In one embodiment of the present invention, the vehicle body vibration excitation device further includes an elastic limiter 5, referring to Figure 1 and Figure 4 The elastic limiting member includes a spring piece 51 and a first positioning portion 52 and a second positioning portion 53 arranged at both ends of the spring piece, the first positioning portion is used to be fixedly connected to the mounting base 1, and the second positioning portion is used to be fixedly connected to the connecting base block 41. In the connected state, the spring piece is arranged perpendicular to the z direction, so that the spring piece can bend and vibrate along the z direction, but cannot bend and vibrate along the x direction or the y direction, thereby playing a limiting and guiding role, so that the docking assembly vibrates in the z direction as much as possible. In a further implementation of this embodiment, the spring piece includes a first spring piece and a second spring piece arranged up and down, the first end of the first spring piece and the second set are integrally connected through a first positioning portion, and the second ends of the first spring piece and the second spring piece are each provided with a second connecting portion, and the connecting base block has a first matching portion 411 for connecting the first spring piece and a second matching portion for connecting the second spring piece.

[0025] An embodiment of the present invention also provides a vehicle excitation method, wherein the vehicle excitation method cooperates with Figure 5 The vehicle abnormal noise test bench shown in the figure is implemented, specifically including the following steps: a. A base 7 is provided, wherein the upper side of the base has a horizontal mounting surface, and four wheel alignment platforms 8 are fixedly mounted on the horizontal mounting surface according to the structure of the vehicle to be tested, and the upper ends of the wheel alignment platforms have arc-shaped platforms 81 for placing wheels; the wheel alignment platforms are detachably fixedly connected to the base, so that the positions of the wheel alignment platforms can be adjusted to match different vehicle models; b. A vibration excitation group is fixedly installed on the horizontal mounting surface, wherein the vibration excitation group comprises a first vehicle body excitation device a1 and a second vehicle body excitation device a2 which are symmetrically arranged with respect to the longitudinal center line of the wheel alignment platform; the vehicle body excitation device is detachably fixedly connected to the base through a mounting base, so that the vehicle body excitation device can adjust the position of the docking end to align with the corresponding connection point of the vehicle; c. placing the four wheels of the vehicle to be tested on the corresponding wheel alignment platform, wherein the bottom of the door sill beam of the vehicle to be tested is provided with a process hole facing downward in the z direction; d. Adjust the position of the butt joint end of the vehicle body excitation device so that the process holes of the butt joint end are aligned in the z direction and fixedly connected; e. Start the vehicle body excitation device to apply synchronous z-axis excitation to the vehicle to be tested, thereby achieving whole vehicle excitation.

[0026] In the above method, the main weight of the vehicle is borne by the four wheel alignment parts, and the docking end only needs to provide the vehicle with the thrust required for the excitation. Compared with the existing technical solution, the performance requirements for the equipment are lower and easier to implement. In this embodiment, the two body excitation devices work synchronously to couple the body excitation, which can further reduce the thrust requirements of the equipment. In the process of body excitation, the vehicle is stably supported by the wheel alignment platform. Even if the body excitation device fails, it will not affect the safety of the whole vehicle. During the excitation process, relevant personnel can enter the interior of the vehicle or the bottom of the vehicle to observe abnormal noises, which is safer and more convenient than the existing technology. In addition, the present invention can be adapted to vehicles of different models by adjusting the installation position of the wheel alignment platform and the body excitation device, and has a wide range of applicability in the detection of abnormal noises of the whole vehicle. It should be noted that the longitudinal center line actually refers to the longitudinal center line of the vehicle after the vehicle is placed on the wheel alignment platform. Since the setting position of the wheel alignment platform corresponds to the final placement position of the vehicle, it can also be considered that the wheel alignment platform has a longitudinal center line.

[0027] In other implementations, the vehicle abnormal noise test bench may also use multiple excitation groups, and the multiple excitation groups work together to achieve vehicle body excitation.

[0028] It should be noted that the above-mentioned whole vehicle excitation method does not strictly limit the operation sequence of each step. For example, in the first embodiment, the position of the process hole can be determined by preliminary calculation. At this time, the body excitation device can be installed first and then the vehicle can be placed on the wheel alignment table, that is, step b is performed first and then step c is performed. In the second embodiment, the vehicle can be placed on the wheel alignment table first, and the body excitation device can be installed according to the position of the process hole, that is, step c is performed first and then step b is performed.

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

Claims

1. A vehicle body excitation device, characterized in that: It includes a mounting base, a power mechanism, a transmission assembly and a docking assembly; the power mechanism includes a mounting frame fixedly connected to the base and an exciter connected to the mounting frame; the transmission assembly includes a transmission force arm and an articulated seat, the articulated seat is fixedly connected to the base, a hinged base connected to the articulated seat and limited in the y direction is formed in the middle of the transmission force arm, the articulated base is connected to a first force arm extending in the direction of the exciter and a second force arm extending in the x direction, the first force arm is connected to the exciter in transmission connection; the docking assembly includes a connecting base block fixedly connected to the second force arm and a docking end fixedly connected to the connecting base block and arranged in the z direction.

2. A vehicle body excitation device according to claim 1, characterized in that: The vehicle body excitation device also includes an elastic limiter, which includes a spring sheet and a first positioning portion and a second positioning portion arranged at both ends of the spring sheet, wherein the first positioning portion and the second positioning portion are respectively fixedly connected to the base and the connecting base block and arrange the spring sheet perpendicular to the z-direction.

3. A vehicle body excitation device according to claim 2, characterized in that: The elastic limiting component includes a first spring sheet and a second spring sheet parallel to each other and arranged in the z direction, the first ends of the first spring sheet and the second spring sheet are integrally connected through a first positioning portion, the second ends of the first spring sheet and the second spring sheet are each provided with a second connecting portion, and the mounting base is provided with a first matching portion corresponding to the first spring sheet and a second matching portion corresponding to the second spring sheet.

4. A vehicle body excitation device according to claim 1, characterized in that: The length of the first lever arm is greater than the length of the second lever arm.

5. A vehicle body excitation device according to claim 1, characterized in that: The hinge seat includes an elastic hinge plate and a first end block and a second end block respectively fixed at both ends of the elastic hinge plate, the first end block and the second end block are respectively fixedly connected to the mounting base and the connecting base block, and the elastic hinge plate includes a first hinge plate and a second hinge plate parallel to the y direction and perpendicular to each other.

6. A vehicle body excitation device according to claim 5, characterized in that: The intersection line of the plane where the first hinge piece is located and the plane where the second hinge piece is located is recorded as the hinge axis, and the first hinge piece coincides with the second hinge piece after rotating 90° around the hinge axis.

7. A vehicle body excitation device according to claim 1, characterized in that: The docking assembly includes a mounting guide rod extending in the z direction, an adjustment frame and a locking member. The connecting base block has a guide hole arranged in the z direction and matched with the lower end of the mounting guide rod. The adjustment frame is sleeved with the upper end of the mounting guide rod, and the locking member can be fixedly connected to the outer periphery of the mounting guide rod.

8. A vehicle body excitation device according to claim 7, characterized in that: The adjustment frame includes an upper base plate, a lower base plate and a support plate. The upper base plate and the lower base plate are parallel to each other. The two ends of the support plate are respectively vertically connected to the edge of the upper base plate and the edge of the lower base plate. The lower base plate is provided with an adjustment hole for the installation guide rod to pass through. The docking end is fixedly connected to the upper base plate.

9. A vehicle body excitation device according to claim 1, characterized in that: The vehicle body excitation device also includes an airbag assembly, which includes an installation frame and a first airbag and a second airbag arranged inside the installation frame. The end of the first force arm is connected to an extension part, and the first airbag and the second airbag are respectively abutted against both sides of the movement direction of the extension part.

10. A vehicle incentive method, comprising the following steps: a. A base is provided, wherein the upper side of the base has a horizontal mounting surface, and a number of wheel alignment platforms corresponding to the number of wheels of the vehicle to be tested are fixed on the horizontal mounting surface according to the structure of the vehicle to be tested, and the upper end of the wheel alignment platform has an arc-shaped table surface for placing wheels; b. at least one excitation group is fixedly mounted on the horizontal mounting surface, each excitation group comprising two vehicle body excitation devices according to any one of claims 1 to 9, which are symmetrically arranged about the longitudinal center line of the wheel alignment station; c. Place each wheel of the vehicle to be tested on the corresponding wheel alignment platform; d. A process hole facing downward in the z direction is provided at the bottom of the door sill beam of the vehicle to be tested, and the docking end of the vehicle body excitation device is adjusted so that the process hole of the docking end is aligned in the z direction and fixedly connected; e. Start the vehicle body excitation device to apply synchronous z-axis excitation to the vehicle to be tested, thereby achieving whole vehicle excitation.

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