A shock absorber assembly test device

Abstract

This application provides a shock absorber assembly testing device, including an upper mounting component, a guide component, a lower mounting component, a vibrator, and a noise detection mechanism. The lower end of the guide component is fixedly connected to the lower mounting component. The upper mounting component is adapted to fixably connect to the upper end of the shock absorber in the shock absorber assembly, and the lower mounting component is adapted to fixably connect to the lower end of the shock absorber in the shock absorber assembly. The space between the upper mounting component and the lower mounting component is adapted to accommodate the shock-absorbing spring of the shock absorber assembly. The upper mounting component is movably connected to the guide component. The vibrator is connected to the lower mounting component and is used to drive the lower mounting component to vibrate in the vertical direction, thereby causing the upper mounting component and the shock absorber assembly to reciprocate in the vertical direction. The shock absorber assembly testing device of this application can test the entire shock absorber assembly and can simulate the actual working conditions of the shock absorber assembly after it is installed in a vehicle.

Description

Technical Field

[0001] This application relates to the field of shock absorber assembly testing technology, and in particular to a shock absorber assembly testing device. Background Technology

[0002] Shock absorber assemblies typically require durability and NVH (Noise, Vibration, Harshness) testing.

[0003] Existing shock absorber test benches typically only test the shock absorber in the shock absorber assembly, without testing the entire shock absorber assembly including the shock absorber spring (coil spring) and the shock absorber. Therefore, they cannot truly simulate the actual working state of the shock absorber assembly after it is installed in the vehicle. Summary of the Invention

[0004] This application provides a shock absorber assembly testing device, a shock absorber assembly testing system, and a vehicle, aiming to improve the problem that existing shock absorber test benches cannot truly simulate the actual working state of the shock absorber assembly after it is installed in a vehicle.

[0005] To address the aforementioned issues, this application provides a shock absorber assembly testing device, comprising an upper mounting component, a guide component, a lower mounting component, a vibrator, and a noise detection mechanism. The lower end of the guide component is fixedly connected to the lower mounting component. The upper mounting component is adapted to be fixedly connected to the upper end of the shock absorber of the shock absorber assembly. The lower mounting component is adapted to be fixedly connected to the lower end of the shock absorber of the shock absorber assembly. The space between the upper mounting component and the lower mounting component is adapted to accommodate the shock-absorbing spring of the shock absorber assembly. The upper mounting component is movably connected to the guide component.

[0006] The vibrator is connected to the lower mounting component and is used to drive the lower mounting component to vibrate in the vertical direction, so as to drive the upper mounting component and the shock absorber assembly to reciprocate in the vertical direction.

[0007] The noise detection mechanism is used to detect the noise generated when the shock absorber assembly reciprocates in the vertical direction.

[0008] The shock absorber assembly testing device of this application embodiment includes an upper mounting member adapted to fix the upper end of the shock absorber in the shock absorber assembly, and a lower mounting member adapted to fix the lower end of the shock absorber in the shock absorber assembly. The space between the upper and lower mounting members is adapted to accommodate the shock-absorbing spring of the shock absorber assembly. The upper mounting member is movably connected to a guide member. A vibrator is connected to the lower mounting member and is used to drive the lower mounting member to vibrate in the vertical direction, thereby driving the upper mounting member and the shock absorber assembly to reciprocate in the vertical direction. A noise detection mechanism is used to detect the noise generated when the shock absorber assembly reciprocates in the vertical direction. Therefore, the shock absorber assembly testing device of this application embodiment can test the entire shock absorber assembly and simulate the actual working conditions of the shock absorber assembly after it is installed in a vehicle.

[0009] In one embodiment, the upper mounting component is provided with a counterweight (not shown in the figure) so that the sprung mass of the shock absorber assembly during testing is the same as the sprung mass when actually installed in the vehicle.

[0010] Existing shock absorber test benches do not consider the sprung mass of the shock absorber assembly, leading to distorted test results. The shock absorber assembly test apparatus of this application, by arranging a pre-set weight on the upper mounting component, ensures that the sprung mass of the shock absorber assembly during testing is the same as the sprung mass when actually installed in the vehicle, thus accurately reflecting the actual working condition of the shock absorber assembly.

[0011] In one embodiment, the upper mounting member includes an upper support plate adapted to fix the upper end of the shock absorber of the shock absorber assembly, the upper support plate being provided with a counterweight of a predetermined mass.

[0012] The upper support plate allows for easy fixing of the upper part of the shock absorber to the shock absorber assembly, and also provides a large area for placing counterweights.

[0013] The upper support plate can be rectangular, round, or other shapes.

[0014] In one embodiment, the counterweight is such that the load center of gravity height of the shock absorber assembly during testing is the same as the load center of gravity height during actual vehicle installation.

[0015] By placing a suitable counterweight on the upper support plate, the load center height of the shock absorber assembly during testing can be ensured to be the same as the load center height during actual vehicle installation, thus more realistically reflecting the actual working condition of the shock absorber assembly.

[0016] In one embodiment, the upper mounting component includes an upper support plate and a lower support plate, the lower support plate being spaced below the upper support plate, the upper support plate being adapted to fix the upper end of the shock absorber of the shock absorber assembly, the lower support plate being provided with a through hole, and the upper end of the shock absorber assembly extending upward through the through hole.

[0017] The upper support plate and the lower support plate are both equipped with the counterweight.

[0018] The upper support plate facilitates the secure fixing of the upper part of the shock absorber assembly and provides a large area for placing counterweights. The lower support plate also provides a large area for counterweights, and through the proper allocation of counterweights on the upper and lower support plates, the load center of gravity height of the shock absorber assembly during testing can be easily adjusted. This ensures that the load center of gravity height during testing is the same as the actual load center of gravity height when installed in the vehicle, thus more accurately reflecting the actual operating conditions of the shock absorber assembly.

[0019] Furthermore, eliminating the lower support plate simplifies the structure of the shock absorber assembly test setup. In this case, the shape design of the upper support plate can ensure that the load center of gravity height during the shock absorber assembly test is the same as the load center of gravity height during actual vehicle installation.

[0020] The upper support plate has a through hole and multiple mounting holes in the middle. The upper end of the shock absorber of the shock absorber assembly can pass through the through hole. The upper end of the shock absorber of the shock absorber assembly can be fixed to the upper support plate by bolts inserted in the mounting holes.

[0021] In one embodiment, a guide sleeve is further included. The guide element is a guide rod that extends vertically. The guide sleeve is movably fitted onto the guide rod and is fixedly connected to the upper mounting component.

[0022] The guide rod and guide sleeve work together to allow the upper mounting component to move up and down in a way that is connected to the guide component.

[0023] Optionally, multiple guide rods are provided around the shock absorber assembly, and each guide rod is fitted with a guide sleeve.

[0024] Multiple guide rods and corresponding guide sleeves are used to make the movement of the upper mounting component more stable. There are three or more guide rods (e.g., four) to further increase the movement stability of the upper mounting component and improve the accuracy of the test structure.

[0025] The lower end of the guide rod is rigidly connected to the lower mounting component, for example, by welding.

[0026] Optionally, it also includes an oil supply mechanism for cooling and lubricating the guide sleeve.

[0027] The oil supply mechanism is used for cooling and lubrication of the guide sleeve. It can cool and lubricate the guide sleeve, avoid dry friction between the guide sleeve and the guide rod, and prevent the guide sleeve from overheating and deforming or being damaged.

[0028] Optionally, the oil supply mechanism includes an oil pump and an oil cup. The oil cup is disposed at the lower end of the guide rod and above the lower mounting component. The oil outlet of the oil pump is connected to the guide sleeve through a first oil pipe to provide coolant to the gap between the guide sleeve and the guide rod. The oil cup is used to receive coolant that slides down the guide rod. The oil inlet of the oil pump draws coolant from the oil cup through a second oil pipe.

[0029] When the vibrator is working, the oil pump provides coolant through the gap between the guide sleeve and the guide rod via the first oil pipe to achieve cooling and lubrication of the guide sleeve. The oil cup is used to collect the coolant that slides down the guide rod. The oil inlet of the oil pump draws coolant from the oil cup through the second oil pipe to achieve coolant circulation. At the same time, the coolant is collected and stored in the oil cup to prevent coolant from splashing everywhere.

[0030] Optionally, it also includes a vibration sensor, a data acquisition unit, and a computer, wherein the vibration sensor is signal-connected to the data acquisition unit, and the data acquisition unit is signal-connected to the computer;

[0031] The vibration sensor is adapted to be installed at the upper end of the piston rod of the shock absorber in the shock absorber assembly, so as to detect the amount of vibration at the upper end of the piston rod of the shock absorber in the shock absorber assembly;

[0032] The data acquisition device is used to collect the vibration amount at the upper end of the piston rod of the shock absorber and transmit it to the computer;

[0033] The noise detection mechanism is connected to the computer signal.

[0034] The vibration sensor detects the vibration at the upper end of the piston rod of the shock absorber in the shock absorber assembly. The data acquisition unit converts the vibration signal from analog to digital and inputs it into a computer. The analysis software on the computer processes the digital signal and can display the vibration frequency of the piston rod at the upper end of the shock absorber in the shock absorber assembly in real time.

[0035] Optionally, the exciter operates based on the actual vehicle road spectrum obtained from real-world road condition testing, so that the excitation of the shock absorber assembly by the exciter is consistent with the excitation of the shock absorber assembly by the road during actual testing.

[0036] Before testing, the shock absorber assembly to be tested is mounted on the vehicle and driven on the road. Vibration sensors are installed at the bottom of the shock absorber assembly to obtain the actual road spectrum. The exciter operates based on the actual road spectrum obtained from the vehicle's road condition testing, ensuring that the excitation from the exciter to the shock absorber assembly is consistent with the excitation from the road during actual testing. Combined with high-temperature, low-temperature, and humidity-controlled environmental chambers, the performance of the shock absorber assembly under various road surface and climate conditions can be highly replicated.

[0037] Optionally, the noise detection mechanism includes an acoustic camera.

[0038] Acoustic cameras can locate the noise problem areas in the shock absorber assembly and perform noise problem analysis.

[0039] Optionally, the acoustic camera includes a housing, a camera, and multiple acoustic sensors. The housing has opposing first and second surfaces. The camera is mounted at the center of the first surface, and the multiple acoustic sensors are arranged around the camera array.

[0040] Acoustic cameras are a mature, existing technology. They utilize acoustic sensor arrays for sound measurement. By measuring the phase difference of sound waves reaching each acoustic microphone within a defined space, the location of the sound source is determined based on phased array principles. The amplitude of the sound source is measured, and the spatial distribution of the sound source is displayed as an image, obtaining a spatial sound field distribution cloud map (acoustic image). The color and brightness of the image represent intensity. This provides users with fast and accurate distribution maps and can capture images of steady-state, non-steady-state, stationary, and moving objects.

[0041] Acoustic sensors are typically arranged in groups of 16 or more to cover a large area. Additionally, supplemental lighting is usually placed near the camera to provide illumination in low-light conditions.

[0042] The operator can hold an acoustic camera and take pictures around the shock absorber assembly, such as moving up and down to take pictures, taking pictures from the top, taking pictures from a fixed point, or taking pictures around the whole circle. Attached Figure Description

[0043] Figure 1 This is a perspective view of a shock absorber assembly testing device provided in an embodiment of the present invention;

[0044] Figure 2 This is a side view of a shock absorber assembly test device provided in an embodiment of the present invention.

[0045] The reference numerals in the accompanying drawings are as follows:

[0046] 100. Shock absorber assembly; 101. Shock absorber; 102. Shock absorber spring;

[0047] 1. Upper mounting component; 11. Upper support plate; 12. Lower support plate;

[0048] 2. Guide component; 21. Guide rod;

[0049] 3. Lower mounting components;

[0050] 4. Vibrator;

[0051] 5. Noise detection mechanism; 51. Acoustic camera; 511. Housing; 5111. First surface; 5112. Second surface; 512. Handle.

[0052] 6. Guide sleeve;

[0053] 7. Oil supply mechanism; 71. Oil pump; 72. Oil cup; 73. First oil pipe; 74. Second oil pipe;

[0054] 8. Vibration sensor;

[0055] 9. Data acquisition unit;

[0056] 10. Computer. Detailed Implementation

[0057] To make the technical problems solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the invention.

[0058] In this article, "up" and "down" refer to... Figure 2 The coordinates are shown.

[0059] See Figures 1 to 2 This invention provides a shock absorber assembly testing device, including an upper mounting component 1, a guide component 2, a lower mounting component 3, a vibrator 4, and a noise detection mechanism 5. The lower end of the guide component 2 is fixedly connected to the lower mounting component 3. The upper mounting component 1 is adapted to fixably connect the upper end of the shock absorber 101 of the shock absorber assembly 100, and the lower mounting component 3 is adapted to fixably connect the lower end of the shock absorber 101 of the shock absorber assembly 100. The space between the upper mounting component 1 and the lower mounting component 3 is adapted to accommodate the shock-absorbing spring 102 of the shock absorber assembly 6. The upper mounting component 1 is movably connected to the guide component 2. The vibrator 4 is connected to the lower mounting component 3 and is used to drive the lower mounting component 3 to vibrate in the vertical direction, thereby driving the upper mounting component 1 and the shock absorber assembly 100 to reciprocate in the vertical direction. The noise detection mechanism 5 is used to detect the noise generated when the shock absorber assembly 100 reciprocates in the vertical direction.

[0060] The shock absorber assembly testing device of this application embodiment includes an upper mounting member 1 adapted to fix the upper end of the shock absorber 101 of the shock absorber assembly 100, and a lower mounting member 3 adapted to fix the lower end of the shock absorber 101 of the shock absorber assembly 100. The space between the upper mounting member 1 and the lower mounting member 3 is adapted to accommodate the shock-absorbing spring 102 of the shock absorber assembly 6. The upper mounting member 1 is movably connected to the guide member 2. The vibrator 4 is connected to the lower mounting member 3 and is used to drive the lower mounting member 3 to vibrate in the vertical direction, thereby driving the upper mounting member 1 and the shock absorber assembly 100 to reciprocate in the vertical direction. The noise detection mechanism 5 is used to detect the noise generated when the shock absorber assembly 100 reciprocates in the vertical direction. Therefore, the shock absorber assembly testing device of this application embodiment can test the entire shock absorber assembly and simulate the actual working conditions of the shock absorber assembly after it is installed in a vehicle.

[0061] In one embodiment, the upper mounting member 1 is provided with a counterweight (not shown in the figure) so that the sprung mass of the shock absorber assembly 100 during testing is the same as the sprung mass when actually installed in the vehicle.

[0062] Existing shock absorber test benches do not take into account the sprung mass of the shock absorber assembly 100, resulting in distorted test results. The shock absorber assembly test apparatus of this application, by arranging a pre-set weight on the upper mounting part 1, enables the sprung mass of the shock absorber assembly 100 during testing to be the same as the sprung mass when actually installed in the vehicle, thus truly reflecting the actual working condition of the shock absorber assembly 100.

[0063] In one embodiment, the upper mounting member 1 includes an upper support plate 11, which is adapted to fix the upper end of the shock absorber 101 of the shock absorber assembly 100, and the upper support plate 11 is provided with a counterweight of a predetermined mass.

[0064] The upper support plate 11 is provided so that the upper end of the shock absorber 101 of the shock absorber assembly 100 can be easily fixed and connected, and there is a large area for placing the counterweight.

[0065] The upper support plate 11 can be rectangular, circular, or other shapes. The lower mounting component 3 is a circular or rectangular flat plate, or a flat plate of other shapes.

[0066] The vibrator 4 is an electromagnetic or hydraulic vibrator. The housing of the vibrator 4 is rigidly connected to the ground or test platform, meaning that the housing part of the vibrator 4 remains stationary.

[0067] In one embodiment, the counterweight is such that the load center of gravity height of the shock absorber assembly 100 during testing is the same as the load center of gravity height during actual vehicle installation.

[0068] By placing a suitable counterweight on the upper support plate 11, the load center height of the shock absorber assembly 100 during the test can be ensured to be the same as the load center height when it is actually installed on the vehicle, which can more realistically reflect the actual working condition of the shock absorber assembly 100.

[0069] In one embodiment, see Figure 1 and Figure 2 The upper mounting component 1 includes an upper support plate 11 and a lower support plate 12. The lower support plate 12 is arranged at intervals below the upper support plate 11. The upper support plate 11 is adapted to fix the upper end of the shock absorber 101 of the shock absorber assembly 100. The lower support plate 12 is provided with a through hole, and the upper end of the shock absorber assembly 100 extends upward through the through hole.

[0070] The upper support plate 11 and the lower support plate 12 are both equipped with the counterweights.

[0071] The upper support plate 11 facilitates the fixed connection of the upper end of the shock absorber 101 to the shock absorber assembly 100, and provides a large area for placing counterweights. The lower support plate 12 also provides a large area for placing counterweights. Through the reasonable configuration of the counterweights on the upper support plate 11 and the lower support plate 12, the load center height of the shock absorber assembly 100 during testing can be easily adjusted, ensuring that the load center height of the shock absorber assembly 100 during testing is the same as the actual load center height when installed in the vehicle, thus more realistically reflecting the actual working condition of the shock absorber assembly.

[0072] Furthermore, eliminating the lower support plate 12 simplifies the structure of the shock absorber assembly 100 test apparatus. In this case, the shape design of the upper support plate 11 can ensure that the load center height of the shock absorber assembly 100 during testing is the same as the load center height during actual vehicle installation.

[0073] The upper support plate 11 has a through hole and multiple mounting holes in the middle. The upper end of the shock absorber 101 of the shock absorber assembly 100 can pass through the through hole. The upper end of the shock absorber 101 of the shock absorber assembly 100 can be fixed to the upper support plate 11 by bolts inserted in the mounting holes.

[0074] In one embodiment, a guide sleeve 8 is further included. The guide member 2 is a guide rod 21 that extends vertically. The guide sleeve 6 is movably fitted onto the guide rod 21 and is fixedly connected to the upper mounting member 1. Specifically, see [link to documentation]. Figure 2 The guide sleeve 6 is fixedly connected between the upper support plate 11 and the lower support plate 12. In this way, the upper support plate 11, the lower support plate 12 and the guide sleeve 6 are fixed together through the guide sleeve 6, and the upper support plate 11, the lower support plate 12 and the guide sleeve 6 move synchronously.

[0075] The guide rod 21 and the guide sleeve 6 guide each other, allowing the upper mounting part 1 to be movably connected to the guide part 2.

[0076] In one embodiment, multiple guide rods 21 are provided around the shock absorber assembly 100, and each guide rod 21 is fitted with a guide sleeve 6.

[0077] Multiple guide rods 21 and corresponding guide sleeves 6 are provided to make the movement of the upper mounting component 1 more stable. There are more than or equal to 3 guide rods 21 (e.g., 4) to further increase the movement stability of the upper mounting component 1 and improve the accuracy of the test structure.

[0078] The lower end of the guide rod 21 is rigidly connected to the lower mounting part 3, for example, by welding.

[0079] The cross-sectional shape of the guide rod 21 matches the cross-sectional shape of the inner hole of the guide sleeve 6. For example, the guide rod 21 is a cylindrical rod, and the inner hole of the guide sleeve 6 is a cylindrical hole; alternatively, the guide rod 21 can be a square rod, and the inner hole of the guide sleeve 6 can be a square hole. The lower support plate 12 is rectangular, circular, or other shapes.

[0080] In one embodiment, an oil supply mechanism 7 is also included, which is used for cooling and lubrication of the guide sleeve 6.

[0081] The oil supply mechanism 7 is used for cooling and lubrication of the guide sleeve 6. It can cool and lubricate the guide sleeve 6, avoid dry friction between the guide sleeve 6 and the guide rod 21, and prevent the guide sleeve 6 from being deformed or damaged due to excessive temperature.

[0082] In one embodiment, the oil supply mechanism 7 includes an oil pump 71 and an oil cup 72. The oil cup 72 is disposed at the lower end of the guide rod 21 and located above the lower mounting member 3. The oil outlet of the oil pump 71 is connected to the guide sleeve 6 through a first oil pipe 73 to provide coolant to the gap between the guide sleeve 6 and the guide rod 21. The oil cup 72 is used to receive the coolant that slides down the guide rod 21. The oil inlet of the oil pump 71 draws coolant from the oil cup 72 through a second oil pipe 74.

[0083] When the vibrator 4 is working, the oil pump 71 provides coolant through the gap between the guide sleeve 6 and the guide rod 21 via the first oil pipe 73, thereby cooling and lubricating the guide sleeve 6. The oil cup 72 is used to receive the coolant that slides down the guide rod 21. The oil inlet of the oil pump 71 draws the coolant from the oil cup 72 through the second oil pipe 74, thereby realizing the circulation of the coolant. At the same time, the coolant is collected and stored through the oil cup 72 to prevent the coolant from splashing everywhere.

[0084] Oil cup 72 is a rotating body or other shape that can gather liquid, for example Figure 1 The inverted frustum shape shown in .

[0085] The number of oil cups 72 is the same as the number of guide sleeves 6, so that all guide sleeves 6 can be cooled and lubricated.

[0086] The oil pump 71 can be an externally powered oil pump, or it can be pumped by the change in air pressure of the oil pump system driven by the mechanical movement of the shock absorber assembly test device r in this application embodiment.

[0087] In one embodiment, the system further includes a vibration sensor 8, a data acquisition unit 9, and a computer 10. The vibration sensor 8 is signal-connected to the data acquisition unit 9, and the data acquisition unit 9 is signal-connected to the computer 10. The vibration sensor 8 is adapted to be installed on the upper end of the piston rod of the shock absorber 101 in the shock absorber assembly 100 to detect the vibration amount at the upper end of the piston rod of the shock absorber 101 in the shock absorber assembly 100. The data acquisition unit 9 is used to collect the vibration amount at the upper end of the piston rod of the shock absorber 101 and transmit it to the computer 10. The noise detection mechanism 5 is signal-connected to the computer 10. The noise detected by the noise detection mechanism 5, generated when the shock absorber assembly 100 reciprocates in the vertical direction, can be transmitted to the computer 10.

[0088] Vibration sensor 8 can detect the vibration of the upper end of the piston rod of the shock absorber 101 in the shock absorber assembly 100. Data acquisition unit 9 converts the vibration from analog signal to digital signal and inputs it to computer 10. The analysis software on computer 10 processes the digital signal and can display the vibration frequency of the piston rod at the upper end of the shock absorber 101 in the shock absorber assembly 100 in real time.

[0089] Computer 10 is either a desktop computer or a laptop computer.

[0090] The vibration sensor 8 is connected to the data acquisition unit 9 via a signal connection, which can be wired or wireless.

[0091] The data acquisition device 9 is connected to the computer 10 via a signal, which can be a wired connection or a wireless connection.

[0092] The noise detection mechanism 5 is connected to the computer 10 via a signal, which can be a wired connection or a wireless connection.

[0093] In one embodiment, the exciter 4 operates based on the actual vehicle road spectrum obtained from actual road condition testing, so that the excitation of the shock absorber assembly 100 by the exciter 4 is consistent with the excitation of the shock absorber assembly 100 by the road during actual testing.

[0094] Before testing, the shock absorber assembly 100 to be tested is mounted on the vehicle and driven on the road. A vibration sensor is installed at the bottom of the shock absorber assembly 100 to obtain the actual road spectrum. The exciter 4 operates based on the actual road spectrum obtained from the vehicle's actual road condition test, ensuring that the excitation of the shock absorber assembly 100 by the exciter 4 is consistent with the excitation of the shock absorber assembly 100 by the road during the actual test. Combined with high-temperature, low-temperature, and humidity-controlled environmental chambers, the performance of the shock absorber assembly 100 under various road surface and climate conditions can be highly replicated.

[0095] Furthermore, the shock absorber assembly test apparatus of this application embodiment, in conjunction with high temperature, low temperature and humidity conditioned environment chambers, can conduct bench durability tests on the shock absorber assembly 100, and can quickly provide feedback on the durability performance of the shock absorber assembly 100.

[0096] In one embodiment, the noise detection mechanism 5 includes an acoustic camera 51.

[0097] The acoustic camera 51 can record video of the shock absorber assembly 100 in real time, calculate the location of the maximum noise (problem noise location) based on the phase difference of the sound waves within a selected frequency range, and display it at the corresponding location in the video recording. This allows for the location of the noise problem area in the shock absorber assembly 100 and the analysis of the noise problem. The video recording can be displayed in real time on the computer 10, which is equipped with analysis software for noise problem analysis.

[0098] In one embodiment, the acoustic camera 51 includes a housing 511, a camera, and a plurality of acoustic sensors. The housing 51 has a first surface 5111 and a second surface 5112 opposite to each other. The camera is mounted at the center of the first surface 5111, and the plurality of acoustic sensors are arranged around the camera array.

[0099] The acoustic camera 51 utilizes existing mature technology. Based on acoustic sensor array sound measurement technology, it measures the phase difference of sound waves arriving at each acoustic sensor within a defined space. Using the phased array principle, it determines the location of the sound source, measures the amplitude of the sound source, and displays the spatial distribution of the sound source as an image, obtaining a spatial sound field distribution cloud map (acoustic image). The color and brightness of the image represent intensity. It can provide users with fast and accurate distribution maps and can capture images of steady-state, non-steady-state, stationary, and moving objects.

[0100] Acoustic sensors are typically arranged in groups of 16 or more to cover a large area. Additionally, supplemental lighting is usually placed near the camera to provide illumination in low-light conditions.

[0101] The operator holds an acoustic camera 51 and can take pictures around the shock absorber assembly 100, such as moving up and down to take pictures, taking pictures from the top, taking pictures from a fixed point, or taking pictures around the whole circle.

[0102] To facilitate the operator's handholding of the acoustic camera 51, a handle 512 is provided on the second surface of the housing 511.

[0103] The vibration sensor 8 and the data acquisition unit 9 are used to obtain the vibration frequency of the piston rod of the shock absorber assembly 100. By comparing the vibration frequency of the piston rod of the shock absorber assembly 100 obtained by the vibration sensor 8 with the problem noise frequency measured by the acoustic camera 51, the problem noise frequency and the location of the problem noise frequency can be better identified.

[0104] The vibration sensor 8, installed on the top of the piston rod of the shock absorber 101, collects the vibration data. After analog-to-digital conversion by the data acquisition unit 9, the data is transmitted to the computer 10. The analysis software on the computer 10 processes the digital signal and can display the vibration frequency of the piston rod at the top of the shock absorber 101 of the shock absorber assembly 100 in real time. Combined with the acoustic camera 51, it can quickly and accurately locate and analyze the location and frequency of noise problems, playing a double protection role.

[0105] Furthermore, if NVH problems are detected in the shock absorber assembly 100, the shock absorber assembly test device of this application embodiment can quickly measure the changes in vibration, noise and frequency before and after the rectification of the shock absorber assembly 100, which is conducive to quantifying the effect and cost of each optimization scheme.

[0106] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A shock absorber assembly test device characterized by, The device includes an upper mounting component, a guide component, a lower mounting component, a vibrator, and a noise detection mechanism. The lower end of the guide component is fixedly connected to the lower mounting component. The upper mounting component is adapted to be fixedly connected to the upper end of the shock absorber of the shock absorber assembly. The lower mounting component is adapted to be fixedly connected to the lower end of the shock absorber of the shock absorber assembly. The space between the upper mounting component and the lower mounting component is adapted to accommodate the shock-absorbing spring of the shock absorber assembly. The upper mounting component is movably connected to the guide component. The vibrator is connected to the lower mounting component and is used to drive the lower mounting component to vibrate in the vertical direction, so as to drive the upper mounting component and the shock absorber assembly to reciprocate in the vertical direction. The noise detection mechanism is used to detect the noise generated when the shock absorber assembly reciprocates in the vertical direction.

2. The shock absorber assembly testing device of claim 1, wherein The upper mounting component is equipped with a counterweight so that the sprung mass of the shock absorber assembly during testing is the same as the sprung mass when it is actually installed on the vehicle.

3. The shock absorber assembly testing device of claim 2, wherein, The upper mounting component includes an upper support plate adapted to fix the upper end of the shock absorber of the shock absorber assembly, and the upper support plate is provided with a counterweight of a predetermined mass.

4. The shock absorber assembly testing device of claim 2, wherein, The counterweight ensures that the load center of gravity height of the shock absorber assembly during testing is the same as that during actual vehicle installation.

5. The shock absorber assembly testing device of claim 4, wherein, The upper mounting component includes an upper support plate and a lower support plate. The lower support plate is spaced below the upper support plate. The upper support plate is adapted to fix the upper end of the shock absorber of the shock absorber assembly. The lower support plate is provided with a through hole, and the upper end of the shock absorber assembly extends upward through the through hole. The upper support plate and the lower support plate are both equipped with the counterweight.

6. The shock absorber assembly testing device of any one of claims 1-5, wherein, It also includes a guide sleeve, wherein the guide element is a guide rod that extends in a vertical direction, and the guide sleeve is movably fitted onto the guide rod and is fixedly connected to the upper mounting component.

7. The shock absorber assembly testing device of claim 6, wherein, The guide rods are arranged in multiple ways around the shock absorber assembly, and each guide rod is fitted with a guide sleeve.

8. The shock absorber assembly testing device of claim 6, wherein, It also includes an oil supply mechanism for cooling and lubricating the guide sleeve.

9. The shock absorber assembly testing device of claim 8, wherein, The oil supply mechanism includes an oil pump and an oil cup. The oil cup is located at the lower end of the guide rod and above the lower mounting component. The oil outlet of the oil pump is connected to the guide sleeve through a first oil pipe to provide coolant to the gap between the guide sleeve and the guide rod. The oil cup is used to receive the coolant that slides down the guide rod. The oil inlet of the oil pump draws coolant from the oil cup through a second oil pipe.

10. The shock absorber assembly testing device of claim 1, wherein, It also includes a vibration sensor, a data acquisition unit, and a computer, wherein the vibration sensor is signal-connected to the data acquisition unit, and the data acquisition unit is signal-connected to the computer; The vibration sensor is adapted to be installed at the upper end of the piston rod of the shock absorber in the shock absorber assembly, so as to detect the amount of vibration at the upper end of the piston rod of the shock absorber in the shock absorber assembly; The data acquisition device is used to collect the vibration amount at the upper end of the piston rod of the shock absorber and transmit it to the computer; The noise detection mechanism is connected to the computer signal.

11. The shock absorber assembly testing device of claim 1, wherein, The exciter operates based on the real vehicle road spectrum obtained from actual road condition testing, so that the excitation of the exciter on the shock absorber assembly is consistent with the excitation of the road on the shock absorber assembly during actual testing.

12. The shock absorber assembly testing device of claim 1, wherein, The noise detection mechanism includes an acoustic camera.

13. The shock absorber assembly testing device of claim 12, wherein: The acoustic camera includes a housing having opposing first and second surfaces, a camera mounted at a center of the first surface, and a plurality of acoustic sensors arranged in an array around the camera.

Images