Device and method for testing vibration transfer function of automotive suspension

Abstract

The invention provides an automobile suspension vibration transfer function testing device and a testing method thereof. The device comprises a mounting disc and a knocking block, a through hole matched with a rim mounting bolt is formed in the mounting disc, and the knocking block is mounted in the center of the mounting disc. The through holes in the mounting disc are circumferentially and uniformly distributed, and a threaded hole is formed in the center and used for mounting the knocking block. The knocking block is of a cube structure and is fixed to the center of the mounting disc through a bolt, and three mutually-perpendicular planes of the knocking block can be adjusted through rotation to be perpendicular to the X axis, the Y axis and the Z axis of the whole vehicle respectively. During testing, the mounting disc is fixed on the rim, and after the angle of the knocking block is adjusted, the three planes of the knocking block are respectively knocked by a force hammer for testing. The device is made of aluminum alloy, is light in weight, and does not affect the test result. According to the method, the problem of data instability caused by inconsistent knocking positions and directions in a traditional test is solved, and the standardization degree and the data comparability of the test are improved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile suspension testing, and in particular to a device and a testing method for automobile suspension vibration transfer function testing. Background Art

[0002] Road noise is one of the typical noise vibration and harshness (NVH) phenomena of automobiles. During the driving process, drivers and passengers can continuously perceive it, which directly affects their subjective experience and easily causes customer complaints. In recent years, pure electric vehicles have developed rapidly. Since pure electric vehicles lack the masking effect of engine noise, road noise is more prominent, and users' complaints about road noise of pure electric vehicles are more obvious and frequent.

[0003] The suspension vibration transfer function is a key system-level performance that affects vehicle road noise. During vehicle model development, multiple suspension vibration transfer function tests are often required. However, existing test methods have the following problems:

[0004] Unstable test data: Due to the design requirements of the rim surface, it is often difficult to find a suitable plane for hammering when selecting the hammering point. In most cases, the hammering is on a curved surface or an inclined surface. It is difficult for testers to control the hammering force and direction, resulting in unstable test data. Multiple repetitions are required to obtain valid experimental data.

[0005] Different knocking positions introduce data errors: the rim shapes of different models are quite different, so the positions of the knocking points relative to the wheel center of different models are often not exactly the same, which will cause certain differences from the actual results when comparing data of different models.

[0006] Lack of standardization: Due to the above problems, the suspension vibration transfer function test lacks a unified standard, which affects the comparability and reliability of the test results.

[0007] Therefore, there is an urgent need for a suspension vibration transfer function testing device and method that can solve the above problems, so as to improve the stability and comparability of the test data and make the suspension vibration transfer function test a more standardized test. Summary of the invention

[0008] The purpose of the present invention is to provide a vehicle suspension vibration transfer function testing device and testing method to solve the problems in the prior art such as unstable test data caused by rim shape and data errors introduced by different knocking positions, so as to achieve standardization of suspension vibration transfer function testing and high robustness of test data.

[0009] To achieve the above-mentioned purpose, in a first aspect, the present invention provides a vehicle suspension vibration transfer function testing device, comprising a mounting plate and a knocking block; the mounting plate is provided with a through hole adapted to the rim mounting bolt; the knocking block is installed at the center position of the mounting plate; and the three mutually perpendicular planes of the knocking block are knocked to perform a suspension vibration transfer function test.

[0010] In some optional embodiments of the present invention, the angle of the striking block is adjusted by rotation so that its three mutually perpendicular planes are respectively perpendicular to the X, Y, and Z axes of the vehicle.

[0011] In some optional embodiments of the present invention, a boss adapted to the rim mounting bolt is provided on the mounting plate, and the through hole penetrates the boss.

[0012] In some optional embodiments of the present invention, a threaded hole is provided at the center of the mounting plate for mounting the knocking block.

[0013] In some optional embodiments of the present invention, the knocking block is a regular cube structure and is installed at the center of the mounting plate by fasteners.

[0014] Preferably, a through hole is opened in the center of the knocking block for mounting it in the center of the mounting plate by means of fasteners.

[0015] In some optional embodiments of the present invention, the material of the mounting plate and the knocking block is aluminum alloy.

[0016] In a second aspect, the present invention provides a method for testing a vibration transfer function of a vehicle suspension, comprising the following steps:

[0017] Mounting the device according to the first aspect on a vehicle wheel rim;

[0018] A force hammer is used to strike three mutually perpendicular planes of the striking block respectively to perform a suspension vibration transfer function test.

[0019] In some optional embodiments of the present invention, the step of installing the device on the vehicle rim includes rotating and adjusting the angle of the knocking block so that its three mutually perpendicular planes are respectively perpendicular to the X, Y, and Z axes of the vehicle, and then fixing the knocking block to the mounting plate.

[0020] In some optional embodiments of the present invention, the striking position of the force hammer is located at the center of the striking block.

[0021] In some optional embodiments of the present invention, the step of installing the device on the vehicle rim includes:

[0022] Remove the original wheel rim mounting bolts;

[0023] Align the through hole of the mounting plate with the mounting hole on the rim;

[0024] The mounting plate is secured to the rim using extension bolts.

[0025] Compared with the prior art, the beneficial effects of the present invention include:

[0026] When conducting the force hammer method suspension vibration transfer function test, the hammer point is required to be located at the wheel center, and the hammer direction is facing the X, Y, and Z directions of the vehicle. However, due to the design requirements of the rim surface during actual testing, it is often difficult to find a suitable plane for hammering when selecting the hammer point. In most cases, the hammer hits a curved surface or an inclined surface. It is difficult for the tester to control the force and direction of the hammering, resulting in unstable test data. It takes many repetitions to obtain valid experimental data. At the same time, the rim shapes of different models are quite different, so the positions of the hammer points relative to the wheel center of different models are often not exactly the same, which will also cause certain differences from the actual results when comparing data of different models.

[0027] When using this device to test the suspension vibration transfer function, the hammer strikes the three planes of the striking block each time. For the tester, it is very easy to control the hammer force and direction, which greatly improves the robustness of the test data. At the same time, for the test of different models, no matter how the rim shape changes, the spatial position of the striking block relative to the rim is fixed. Therefore, the suspension vibration transfer test method using this device is more standardized, and the data obtained is more comparable.

[0028] 1. Improve the stability of test data: By using standardized striking blocks, testers can better control the force and direction of the hammer, greatly improving the robustness of the test data.

[0029] 2. Reduce data errors between different models: For the tests of different models, no matter how the rim shape changes, the spatial position of the knocking block relative to the rim is fixed. Therefore, the suspension vibration transmission test method using this device is more standardized and the data obtained is more comparable.

[0030] 3. Achieve test standardization: By introducing standardized test equipment and methods, the suspension vibration transfer function test becomes a more standardized and reliable test process.

[0031] 4. Wide applicability: The device can be applied to rims of various shapes and has good versatility.

[0032] 5. Easy operation: The test device is easy to install and the test process is simple and clear, which is conducive to improving test efficiency.

[0033] 6. Lightweight design: Made of aluminum alloy, it reduces the weight of the device and reduces the impact on the measurement results. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments disclosed in the present invention, the drawings of the embodiments will be briefly introduced below. These drawings are only used for illustrative purposes and are not intended to limit the protection scope of the present invention.

[0035] Figure 1 This is a schematic diagram of the use status of a vehicle suspension vibration transfer function testing device provided by an embodiment of the present invention;

[0036] Figure 2 The present invention is a schematic diagram of the three-dimensional structure of a mounting plate of a vehicle suspension vibration transfer function testing device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0037] The technical solution of the present invention (including the preferred technical solution) is further described in detail below by means of the accompanying drawings and by listing some optional embodiments of the present invention. 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.

[0038] Example 1: Basic test equipment

[0039] This embodiment provides a basic vehicle suspension vibration transfer function test device. Figure 1 As shown, the device mainly includes two main components: a mounting plate 1 and a striking block 2.

[0040] The mounting plate 1 is a circular plate-shaped structure made of aluminum alloy. The mounting plate 1 is provided with five through holes 11 adapted to the rim mounting bolts. The diameter of the through holes 11 matches the mounting bolts of the automobile rim and the position corresponds to the mounting holes of the rim. The mounting plate 1 is used to fix the mounting plate 1 on the rim 3 by lengthening the bolts. The center of the mounting plate 1 is provided with a threaded hole 12 for mounting the knocking block 2.

[0041] The knock block 2 is a cube with a length, width and height of 30 mm, made of aluminum alloy, with a through hole 21 in the middle, and is installed on the threaded hole 12 of the mounting plate 1 by bolts. During installation, the knock block 2 is rotated to adjust its angle so that the three planes of the knock block 2 are respectively perpendicular to the X, Y, and Z axes of the vehicle.

[0042] The specific installation and testing steps are as follows:

[0043] Step 1: Remove the mounting bolts of the original wheel rim 3, align the through hole 11 of the mounting plate 1 with the mounting hole of the rim 3, and use the extended bolts to fix the mounting plate 1 on the rim 3 through the through hole 11.

[0044] Step 2: Install the knocking block 2 on the threaded hole 12 of the mounting plate 1 by means of bolts, adjust the angle of the knocking block 2 so that its three planes are respectively perpendicular to the X, Y, and Z axes of the vehicle, and ensure that the plane direction of the knocking block 2 is correct after the bolts are tightened.

[0045] Step 3: Use a hammer to strike the three planes of the striking block 2 respectively, and excite along the X, Y, and Z axis directions to test the vibration transfer function of the suspension.

[0046] Through the above steps, testers can ensure that the position and direction of the knocking point are consistent when conducting suspension vibration transfer function tests, reduce data errors caused by different knocking positions and angles, and improve the stability and comparability of test data.

[0047] Example 2: Test device with boss structure

[0048] Based on the first embodiment, the structure of the mounting plate is improved in this embodiment. Figure 2 As shown, five bosses 13 adapted to the rim mounting bolts are added to the mounting plate 1. The through hole 11 runs through the center of the boss 13. This design can better ensure the coaxiality of the mounting plate and the rim and improve the mounting accuracy.

[0049] In some optional embodiments of the present invention, the boss 12 is cylindrical.

[0050] Considering the universal requirements of rims of different models, the outer diameter of the boss 12 is slightly smaller than the inner diameter of the rim mounting hole, which can ensure that the device can be accurately positioned on rims of different models. At the same time, the presence of the boss also increases the contact area between the mounting plate and the rim, improving the stability of the connection.

[0051] Embodiment 3: Improved knocking block structure

[0052] This embodiment optimizes the structure of the striking block. In addition to the central through hole 21, the striking block 2 is processed with a smoothly transitioned pit at the center position of the three mutually perpendicular test planes. The function of these pits is to provide accurate striking position identification for the force hammer, ensuring that the force hammer can hit the same position in each test, thereby improving the repeatability of the test data.

[0053] During the test, the operator aligns the striking end of the hammer with the center of the pit and strikes it, which can effectively avoid the deviation of the striking position and ensure the accuracy of the test data.

[0054] Example 4: Standardized test method

[0055] This embodiment describes in detail the standard operating procedures for using the device to perform suspension vibration transfer function testing:

[0056] 1. Installation preparation:

[0057] Check that the vehicle's tire pressure is at standard level;

[0058] Make sure the vehicle is on level ground;

[0059] Record the test conditions such as ambient temperature and humidity.

[0060] 2. Device installation:

[0061] Loosen the rim bolts in sequence, being careful not to completely remove all of them at the same time;

[0062] Align and position the mounting plate 1;

[0063] Use a torque wrench to tighten the extension bolts in sequence according to the torque values ​​specified for the vehicle model;

[0064] Install the strike block 2 and adjust the angle.

[0065] 3. Angle calibration:

[0066] Use a level to ensure that the three planes of the striking block 2 are parallel to the X, Y, and Z axes of the vehicle coordinate system respectively;

[0067] Use an angle ruler to check the verticality of each plane to ensure that the error is within ±1°.

[0068] 4. Test implementation:

[0069] Perform five consecutive force hammer strikes at the center of each plane of striking block 2;

[0070] Keep the force of each strike consistent. It is recommended to use a hammer with a force value display.

[0071] The force and acceleration response data of each tap are recorded.

[0072] 4. Data processing:

[0073] Remove obviously abnormal test data;

[0074] Calculate the average transfer function in each direction;

[0075] Generates standard test reports.

[0076] This standardized testing method can significantly improve test efficiency and data reliability, and is particularly suitable for comparative testing between different vehicle models.

[0077] Example 5: Engineering Application Optimization

[0078] In view of the special needs in actual engineering applications, the three test planes of the striking block 2 are marked with X, Y, and Z respectively, and are distinguished by different colors to avoid confusion of directions during testing. The marking adopts laser etching technology to ensure that it will not wear out during long-term use.

[0079] Through the detailed description of the above embodiments, those skilled in the art can clearly understand the specific implementation of the present invention. The test device of the present invention has a simple structure and is easy to use, and can effectively improve the accuracy and repeatability of the suspension vibration transfer function test. At the same time, the device has strong versatility and is suitable for the testing needs of various models, providing a reliable testing tool for the research and improvement of automobile NVH performance.

[0080] Those skilled in the art will readily appreciate that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, combinations, replacements, improvements, etc. made within the spirit and principles of the present invention are included within the protection scope of the present invention.

Claims

1. A vehicle suspension vibration transfer function testing device, characterized in that: It includes a mounting plate and a knocking block; the mounting plate is provided with a through hole adapted to the rim mounting bolt; the knocking block is installed at the center of the mounting plate; three mutually perpendicular planes of the knocking block are knocked to perform a suspension vibration transfer function test.

2. The vehicle suspension vibration transfer function testing device according to claim 1, characterized in that: The angle of the striking block is adjusted by rotation so that its three mutually perpendicular planes are respectively perpendicular to the X, Y, and Z axes of the vehicle.

3. The vehicle suspension vibration transfer function testing device according to claim 1 or 2, characterized in that: The mounting plate is provided with a boss adapted to the rim mounting bolt, and the through hole penetrates the boss.

4. The vehicle suspension vibration transfer function testing device according to claim 3, characterized in that: A threaded hole is provided at the center of the mounting plate for mounting the knocking block.

5. The vehicle suspension vibration transfer function testing device according to claim 1 or 2, characterized in that: The knocking block is a regular cube structure and is installed at the center of the mounting plate through fasteners.

6. The vehicle suspension vibration transfer function testing device according to claim 5, characterized in that: A through hole is provided at the center of the knocking block for mounting it at the center of the mounting plate through a fastener.

7. A method for testing the vibration transfer function of an automobile suspension, characterized in that: The following steps are involved: Mounting the device according to any one of claims 1 to 6 on a vehicle rim; A force hammer is used to strike three mutually perpendicular planes of the striking block respectively to perform a suspension vibration transfer function test.

8. The method for testing the vibration transfer function of a vehicle suspension according to claim 7, characterized in that: The step of installing the device on the vehicle rim includes rotating and adjusting the angle of the knocking block so that its three mutually perpendicular planes are respectively perpendicular to the X, Y and Z axes of the whole vehicle, and then fixing the knocking block to the mounting plate.

9. The method for testing the vibration transfer function of a vehicle suspension according to claim 7 or 8, characterized in that: The striking position of the power hammer is located at the center of the striking block.

10. The method for testing the vibration transfer function of a vehicle suspension according to claim 7 or 8, characterized in that: The step of installing the device on the vehicle rim comprises: Remove the original wheel rim mounting bolts; Align the through hole of the mounting plate with the mounting hole on the rim; The mounting plate is secured to the rim using extension bolts.

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