Device and method for testing minimum abnormal sound displacement of sealing strip

Abstract

The invention relates to the technical field of automobile sealing strip abnormal sound testing, and discloses a sealing strip minimum abnormal sound displacement testing device, which comprises an environment bin and a material compatibility test bench arranged in the environment bin, and is characterized in that the environment bin provides an automobile road driving environment testing working condition for a tested sealing strip; therefore, the test can better simulate the abnormal sound condition of the sealing strip in the actual state of the vehicle. And the material compatibility test bench is used for clamping the sealing strip and realizing the stick-slip motion test of the sealing strip in a multi-angle conversion and front-back translation state. The purpose of effectively preventing the abnormal sound of the sealing strip of the whole automobile in the early stage of automobile design, research and development is achieved by simulating the minimum abnormal sound displacement test of the sealing strip under different working conditions when the sealing strip runs on a real automobile road.

Description

Technical Field

[0001] The invention relates to the technical field of abnormal noise testing of automobile sealing strips, and in particular to a sealing strip minimum abnormal noise displacement testing device and method. Background Art

[0002] Abnormal noise from automobile sealing strips usually refers to the relative displacement between the door frame and the body of the car under the torsional force during the driving process of the car. At this time, the sealing strip at the connection and the sheet metal paint surface or glass surface with which it cooperates produce stick-slip movement, resulting in high-frequency abnormal noise caused by friction. Abnormal noise is an important indicator for measuring automobile manufacturing quality and driving experience, and abnormal noise from sealing strips accounts for a large proportion of automobile abnormal noise complaints, especially in electric vehicles with reduced background noise. This type of abnormal noise problem is easily recognized by users and causes complaints or even repair claims. Therefore, it is particularly important to avoid abnormal noise from automobile sealing strips during driving during the automobile design and production process.

[0003] At present, the following two solutions are usually adopted to solve the problem of abnormal noise of sealing strips during the abnormal noise adjustment stage of automobiles: the first is to change the design section of the sealing strip, but this method will not only greatly increase the mold development cost, but also extend the development cycle of the automobile; the second is to match the coating material with better compatibility. The disadvantage of this method is that the matching of coating materials needs to be verified through multiple rounds of tests, and its durability will wear out with the increase of vehicle mileage, resulting in the sealing strip and the body sheet metal or glass to produce friction noise as long as it undergoes a certain mileage after the vehicle has traveled a certain distance. Moreover, this abnormal noise is usually relatively sharp, with a frequency of up to 1000-8000Hz, which brings an extremely bad experience to car users.

[0004] Based on this, how to prevent abnormal noise from the sealing strips of the entire vehicle through testing in the early stage of automobile design and development is an urgent problem to be solved in the current booming automobile industry. Summary of the invention

[0005] The present invention aims to provide a sealing strip minimum abnormal noise displacement test device and method, so as to achieve the purpose of effectively preventing the abnormal noise of the sealing strip of the whole vehicle in the early stage of automobile design and development by simulating the minimum abnormal noise displacement test of the sealing strip under different working conditions of actual vehicle road driving.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a sealing strip minimum abnormal noise displacement test device, including an environmental chamber and a material compatibility test bench arranged in the environmental chamber, the environmental chamber provides a car road driving environment test condition for the tested sealing strip, so that the test can better simulate the situation where the sealing strip in the actual vehicle has abnormal noise; the material compatibility test bench is used to clamp the sealing strip, and realize the stick-slip motion test of the sealing strip in a multi-angle transition and front and rear translation state.

[0007] The beneficial effects of this solution are as follows: through the environmental chamber and the material compatibility test bench, simulation of the actual vehicle assembly posture of the sealing strip, PSD random excitation road spectrum under the actual vehicle road conditions of the sealing strip, simulation of the actual vehicle working conditions of the sealing strip under rain conditions and dust accumulation conditions, realization of different ambient temperature cycles when the sealing strip is squeezed relative to the sheet metal and glass, realization of different ambient humidity when the sealing strip is squeezed relative to the sheet metal and glass, realization of different sliding speeds when the sealing strip is squeezed relative to the sheet metal and glass, and realization of different extrusion forces when the sealing strip is squeezed relative to the sheet metal and glass are realized, and then based on the above-mentioned various rich working conditions, the minimum abnormal noise displacement test of the sealing strip is carried out, and the actual vehicle sealing strip assembly conditions are accurately simulated, that is, the sealing strip is subjected to a comprehensive, real and accurate actual vehicle road driving conditions, thereby improving the accuracy of the sealing strip test, and comprehensively and accurately testing the minimum displacement of the sealing strip under various working conditions, so as to achieve the purpose of effectively preventing the abnormal noise of the whole vehicle sealing strip in the early stage of automobile design and development.

[0008] Preferably, the material compatibility test bench includes a flip plate and a material clamping fixture, wherein two flip plates are symmetrically arranged and both flip plates are rotatably connected in the environmental chamber; two material clamping fixtures are provided and the two material clamping fixtures are detachably connected to the inner sides of the two flip plates respectively.

[0009] Preferably, the material compatibility test bench is provided with a vibration exciter, which can load a PSD random excitation road spectrum simulating a real vehicle abnormal noise evaluation road to excite the tested sealing strip.

[0010] The beneficial effects of this solution are as follows: the exciter can load the PSD random excitation road spectrum that simulates the actual vehicle abnormal noise evaluation road, thereby exciting the tested sealing strip sample; by applying PSD to the simulation test of the sealing strip, further in the automobile research and development and testing stage, by simulating random vibrations under different road conditions, the performance of the sealing strip to be tested under different road conditions can be predicted, so as to more realistically and accurately simulate the working conditions of the sealing strip on the actual vehicle road.

[0011] Preferably, a sealing strip minimum abnormal noise displacement test method comprises the following steps:

[0012] S1, set the test conditions of the sealing strip according to the test requirements;

[0013] S2, simulates the actual road driving posture of the sealing strip, measures the displacement caused by the deformation of the sealing strip itself when the sealing strip reaches the maximum static friction from the static state, and obtains the minimum displacement test result;

[0014] S3, based on the minimum displacement test results, predict the abnormal noise performance of the sealing strip in the whole vehicle state. If the abnormal noise performance meets the requirements, it indicates that the relevant parameters of the sealing strip do not need to be optimized; if the abnormal noise performance does not meet the requirements, it indicates that the sealing strip abnormal noise exists and the relevant parameters need to be optimized.

[0015] The beneficial effects of this solution are as follows: by changing and combining the minimum abnormal noise displacement parameters of the sealing strip, a variety of abnormal noise tests on the whole vehicle sealing strip are carried out, and the minimum abnormal noise displacement value of the sealing strip obtained by the test is compared with the relative displacement between the door frame and the body in the design and development stage to determine the risk of abnormal noise in the sealing strip of the whole vehicle, so as to enable timely warning in the design stage and then optimize the rectification, avoid the increase in development costs and extension of the solution verification cycle caused by friction noise of the sealing strip in the production stage, reduce the cost of abnormal noise adjustment of the whole vehicle in the later stage, and further fill the gap in real simulation and accurate simulation in the existing automobile sealing strip testing.

[0016] Preferably, in S2, the sealing strip is clamped by using a material clamping tool on a material compatibility test bench in an actual contact manner with a part of the actual vehicle, the extrusion posture of the sealing strip under the actual vehicle road driving condition is truly simulated, and a minimum abnormal noise displacement test is performed.

[0017] Preferably, in S2, an environmental chamber and a material compatibility test bench are used to simulate the sealing strip rain exposure condition and perform a minimum abnormal noise displacement test.

[0018] Preferably, in S2, a material compatibility test bench is used to carry out a minimum abnormal noise displacement test under a dust accumulation condition of the sealing strip.

[0019] Preferably, in S2, an environmental chamber is used to place the sealing strip under different temperature cycle control conditions to perform a minimum abnormal noise displacement test; and the cycle temperature is controlled in a range of -20-80°C.

[0020] Preferably, in S2, an environmental chamber is used to place the sealing strip under different humidity control conditions to perform a minimum abnormal noise displacement test; and the humidity control range is 10%-90% RH.

[0021] Preferably, in S2, a material compatibility test bench is used to control different sliding speeds of the sealing strip and perform a minimum abnormal noise displacement test; and the sliding speeds of the test include 1 mm / s, 2 mm / s, and 4 mm / s.

[0022] The beneficial effects of this solution are as follows: 1. When the sliding speed is set to 1 mm / s, the material pair in contact is mainly EPDM high molecular polymer material and metal paint plate. In the high elastic state of the sealing strip, the displacement caused by its own deformation under the extrusion condition will only cause stick-slip motion under low speed conditions, so it is set to 1 mm / s low speed test;

[0023] 2. When set to 2mm / s, the material pairs that are in contact with each other are mainly TPE or TPV polymer materials. The sealing strip is more likely to produce obvious pulse response at a sliding speed of 2mm / s;

[0024] 3. When set to 4mm / s, it is mainly based on the flocked sealing strips on the surface. Compared with metal or glass, it simulates the movement state of the vehicle under the bumpy conditions of actual operation, and it is more likely to produce abnormal noise at this speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a testing device in an embodiment of the present invention;

[0026] Figure 2 This is a PSD spectrum diagram of random excitation of the exciter in an embodiment of the present invention;

[0027] Figure 3 is a flow chart of a testing method in an embodiment of the present invention;

[0028] Figure 4 Graph showing the temperature cycle in an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The following is further described in detail through specific implementation methods:

[0030] The reference numerals in the drawings of the specification include: a flip plate 1 , a material clamping tool 2 , and a double-tube sealing strip 3 .

[0031] Example

[0032] The embodiment is basically as shown in the attached Figure 1-4 As shown, a sealing strip minimum abnormal noise displacement test device and method are provided. The newly designed test device is used to accurately simulate the actual assembly conditions of the sealing strip on the actual vehicle, so that the sealing strip is tested for abnormal noise displacement under various working conditions before installation, thereby increasing the comprehensiveness of the sealing strip test and the authenticity of the simulation, so that the test can provide more reliable and reference-worthy sealing strip abnormal noise displacement test data, and ultimately achieve effective prevention of the problem of abnormal noise from the sealing strip of the entire vehicle in the early stage of automobile design and development based on the test data, so as to avoid the situation in which the automobile production cost and production period are increased in order to solve the abnormal noise from the sealing strip after the actual vehicle is installed in the later stage.

[0033] Among the various tests of existing sealing strips, most of them are mainly aimed at the situation where the sealing strips produce abnormal noise due to friction caused by displacement after being subjected to different sizes of extrusion pressure, but there are relatively few studies on the minimum abnormal noise displacement of the sealing strips. The minimum abnormal noise displacement of the sealing strip refers to the friction between the sealing strip and the body sheet metal or glass surface under specific test conditions, and the sealing strip is squeezed and deformed to gradually generate elastic strain energy; when the maximum static friction force is reached, the elastic strain energy stored in the sealing strip is the largest, and when the elastic strain energy exceeds the maximum static friction force, the sealing strip begins to slide, and the elastic strain energy is converted into kinetic energy, thereby generating abnormal noise. Therefore, the displacement of the sealing strip caused by the deformation of the sealing strip from the beginning of storing elastic strain energy to the conversion into kinetic energy is called the minimum abnormal noise displacement of the sealing strip. In this embodiment, the test of the minimum abnormal noise displacement of the automotive sealing strip is mainly described.

[0034] First, this scheme proposes a sealing strip minimum abnormal noise displacement test device, including an environmental chamber and a material compatibility test bench arranged in the environmental chamber. The environmental chamber provides a road driving condition test environment for the tested sealing strip to ensure that the test conditions can better simulate various situations in which the sealing strip in the actual vehicle will have abnormal noise. Based on the various factors that affect the abnormal noise of the sealing strip during actual vehicle driving, in this embodiment, the road driving environment test conditions include rain conditions, dust accumulation conditions, different temperature conditions and different humidity conditions. Among them, the simulation method of the rain condition is: including two implementation methods of manual water spraying and automatic water spraying. The specific operation of the automatic water spraying is to install a spray pipe on the wall of the environmental chamber, and the end of the spray pipe extending to the outside of the environmental chamber is connected to a water storage tank, and multiple nozzles are installed on the inner side of the top of the environmental chamber. The nozzles are all connected to the spray pipe. A water flow regulating valve is installed on the spray pipe. The amount of spray water is achieved by adjusting the opening of the water flow regulating valve, thereby realizing the road driving simulation conditions of the actual vehicle with different rainfall amounts. The simulation method of dust accumulation is as follows: before the test, different amounts of Arizona dust are manually applied on the surface of the sealing strip to be tested to simulate the different dust accumulation conditions that actually exist in the sealing strip after a long period of use. The simulation method of different temperature conditions and different humidity conditions is as follows: temperature sensors and humidity sensors are installed in the environmental chamber, and heat exchangers are installed on the walls of the environmental chamber, and then the temperature and humidity inside the environmental chamber are changed by adjusting the heating or cooling of the heat exchanger and spraying water mist through the nozzle, and the temperature and humidity are precisely controlled by the temperature sensor and humidity sensor, so that the sealing strip can be tested in environments with different temperatures and humidities, and the environment with different temperatures and humidities of the actual vehicle driving on the road is accurately simulated, that is, the real environment of the sealing strip when driving in different seasons, different regions and different altitudes is simulated.

[0035] The material compatibility test bench is used to clamp the sealing strip and make the sealing strip in a state of multi-angle transformation and front-back translation for stick-slip motion testing, so as to more realistically complete the simulation of the sealing strip assembly posture on the actual vehicle. Figure 1 As shown, the material compatibility test bench includes a flip plate 1 and a material clamping fixture 2. The flip plates 1 are symmetrically arranged with two pieces, and the two flip plates 1 are rotatably connected in the environmental chamber through a rotating shaft. There are also two material clamping fixtures 2. The two material clamping fixtures 2 are detachably connected to the inner sides of the two flip plates 1 by screws. The structure and shape of the material clamping fixture 2 are specifically designed and manufactured according to the structure of the sealing strip to be tested. The detachable connection method can meet the requirements of the simulated test clamping and fixing of sealing strips of different shapes and specifications. In this embodiment, the sealing strip is a double-tube sealing strip 3. Therefore, based on the special structure of the double-tube sealing strip 3, a material clamping fixture 2 is provided to clamp and fix it, so that the test part of the sealing strip is in the same state as the actual vehicle installation. In addition, according to different test requirements, the material of the material clamping fixture 2 is either sheet metal or glass.

[0036] The material clamping fixture 2 can achieve 360° angle adjustment of the sealing strip and ±100mm translation of the sealing strip. Among them, the adjustment of the sealing strip angle is achieved by the cooperation of the material clamping fixture 2 and the flip plate 1, and the translation of the sealing strip is achieved by a mobile component installed on the material compatibility test bench. In the sealing strip abnormal sound test, the relative displacement between the sealing strip to be tested and the sheet metal or glass by clamping the mobile component belongs to the prior art and will not be repeated here. Through this material compatibility test bench, it is possible to achieve the local contact between the intercepted sealing strip sample of a specific length and the sheet metal or glass, and further ensure the actual vehicle assembly posture of the sealing strip by adjusting the angle, the position of the clamping point and the contact pressure of the material clamping fixture, so as to achieve the purpose of more accurately simulating the actual vehicle use environment of the sealing strip. In this embodiment, the intercepted length of the sealing strip is specifically 100mm.

[0037] At the same time, the material compatibility test bench is also equipped with an exciter (not shown in the figure), which can load the PSD random excitation road spectrum simulating the road for abnormal noise evaluation of real vehicles, so as to stimulate the tested sealing strip. PSD (power spectrum density) random road spectrum excitation can describe and simulate the random vibration excitation of the sealing strip on the real vehicle caused by the unevenness of the road surface through PSD in the test. In practical applications, the unit of PSD can be g 2 / Hz or (m / s 2 ) 2 / Hz, in this embodiment Figure 2 As shown, the unit is (m / s 2 ) 2 / Hz, which indicates the vibration energy contained in each frequency unit. This solution applies PSD to the simulation test of sealing strips. In the automotive R&D and testing stage, it simulates random vibrations under different road conditions to predict the performance of the sealing strips to be tested under different road conditions, so as to simulate the working conditions of the sealing strips on actual roads more realistically and accurately.

[0038] Traditional sealing strip minimum noise displacement test devices can usually only use a single force load for excitation, so it is difficult to accurately simulate the load conditions of the sealing strip under the actual use conditions of the actual vehicle. By adding the PSD road spectrum excitation of the actual vehicle noise evaluation road and testing the minimum noise displacement of the sealing strip under this condition, it is possible to more comprehensively simulate the actual working conditions of the sealing strip, thereby more comprehensively preventing the noise of the sealing strip. Figure 2 As shown, the exciter provides different excitation frequencies during the test, so that the material compatibility test bench transmits different load conditions to the sealing strip under test, simulating a variety of actual vehicle road driving conditions.

[0039] Applied to the above-mentioned measuring device, this embodiment also provides a sealing strip minimum abnormal noise displacement test method, which further enriches the testing content of the sealing strip minimum abnormal noise displacement, so that the test of the sealing strip is more comprehensive, and the test results can better meet the actual situation of the actual vehicle road driving environment conditions.

[0040] The test method specifically includes the following steps:

[0041] S1, set the test conditions of the sealing strip according to the test requirements.

[0042] Different car companies have different testing requirements for the sealing strips installed on their car bodies. The testing environment for the sealing strips is set in advance through the environmental chamber to meet the simulation of different environmental working conditions for the sealing strip tests.

[0043] S2, simulates the actual road driving posture of the sealing strip, measures the displacement caused by the deformation of the sealing strip itself when the sealing strip reaches the maximum static friction from the static state, and obtains the minimum displacement test result.

[0044] In this step, the material compatibility test bench is used to simulate the installation of the sealing strip on the actual vehicle and the actual vehicle road driving conditions. The simulation test of the actual vehicle conditions specifically includes the following contents:

[0045] The first method is to use the material clamping tool 2 on the material compatibility test bench to clamp the sealing strip in the actual contact mode with the actual vehicle sheet metal and glass parts, thereby truly simulating the extrusion posture of the sealing strip under the actual vehicle road driving conditions and conducting a test on the minimum abnormal noise displacement.

[0046] The second method uses the exciter on the material compatibility test bench to simulate the PSD random excitation road spectrum of the sealing strip on the road and conduct a minimum abnormal noise displacement test.

[0047] The third method is to use an environmental chamber and a material compatibility test bench to simulate the rain condition of the sealing strip and conduct a test on the minimum abnormal noise displacement.

[0048] The fourth method is to use a material compatibility test bench with manual operation to conduct a minimum abnormal noise displacement test under the condition of dust accumulation on the sealing strip after long-term use of the vehicle.

[0049] The fifth method is to use an environmental chamber to place the sealing strip under different temperature cycle control conditions and conduct a minimum abnormal noise displacement test. Figure 4 As shown, in this embodiment, the control range of the cycle temperature is -20-80°C, and this temperature range can almost cover the conditions of the actual vehicle road driving environment.

[0050] The sixth method is to use an environmental chamber to place the sealing strip under different humidity control conditions to perform a minimum abnormal noise displacement test. In this embodiment, the humidity control range is 10%-90% RH to better meet different test requirements.

[0051] The seventh is to use the material compatibility test bench to control the different sliding speeds of the sealing strip and conduct a test on the minimum abnormal noise displacement. In this embodiment, the sliding speeds tested include 1mm / s, 2mm / s, and 4mm / s. Among them, when the sliding speed is set to 1mm / s, it is mainly based on the contacting material pair of EPDM polymer material and metal paint plate. In the high elastic state of the sealing strip, due to the displacement of itself under the extrusion condition, stick-slip motion will only occur under low-speed conditions, so it is set to 1mm / s low-speed test. When it is set to 2mm / s, it is mainly for the contacting material pair of TPE or TPV polymer materials. The sealing strip is more likely to produce obvious pulse response at a sliding speed of 2mm / s. When it is set to 4mm / s, it is mainly based on the surface flocking sealing strip. Compared with metal or glass, the movement state under the bumpy working conditions of the actual operation of the vehicle is more likely to produce abnormal noise at this speed.

[0052] The eighth method is to use the material compatibility test bench to apply different compressive forces to the sealing strip test sample to test the minimum abnormal noise displacement. The sealing strip is tested by the material clamping tool 2 with compressive forces including 10N, 20N, and 40N.

[0053] S3, based on the minimum displacement test results, predict the abnormal noise performance of the sealing strip in the whole vehicle. If the abnormal noise performance meets the requirements, it indicates that the relevant parameters of the sealing strip do not need to be optimized; if the abnormal noise performance does not meet the requirements, it indicates that the sealing strip abnormal noise exists and the relevant parameters need to be optimized.

[0054] The sealing strip to be tested is tested through the above steps to obtain the final test data. According to the data performance, the minimum abnormal noise displacement performance of the sealing strip under road driving conditions after the later installation of the whole vehicle can be judged, and then it can be determined in the automobile design stage whether the sealing strip needs to be optimized to reduce the economic and time costs of automobile production and manufacturing.

[0055] In the present invention, a sealing strip minimum abnormal noise displacement test device is provided, which realizes the following functions, including simulating the sealing strip assembly posture of an actual vehicle, PSD random excitation road spectrum under the sealing strip actual vehicle road condition, simulating the sealing strip raining condition and dust accumulation condition under the actual vehicle working condition, realizing different ambient temperature cycles when the sealing strip is squeezed relative to the sheet metal and glass, realizing different ambient humidity when the sealing strip is squeezed relative to the sheet metal and glass, realizing different sliding speeds when the sealing strip is squeezed relative to the sheet metal and glass, realizing different squeezing forces when the sealing strip is squeezed relative to the sheet metal and glass, and then performing the sealing strip minimum abnormal noise displacement test based on the above-mentioned various rich working conditions, accurately simulating the sealing strip assembly conditions of the actual vehicle, that is, conducting a comprehensive, real and accurate actual vehicle road driving condition test on the sealing strip, thereby improving the accuracy of the sealing strip test, comprehensively and accurately testing the minimum displacement of the sealing strip abnormal noise under various working conditions, and achieving the purpose of effectively preventing the abnormal noise of the sealing strip of the entire vehicle in the early stage of automobile design and development.

[0056] Furthermore, in order to optimize the relevant design schemes of sealing strips, the present invention further provides a sealing strip minimum abnormal noise displacement test method, which is applied in the minimum abnormal noise displacement test process of the sealing strips of the whole vehicle, and a variety of abnormal noise tests of the sealing strips of the whole vehicle are carried out by changing and combining the minimum abnormal noise displacement parameters of the sealing strips. The minimum abnormal noise displacement value of the sealing strip obtained by the test is compared with the relative displacement between the door frame and the body in the design and development stage to determine the risk of abnormal noise in the sealing strips of the whole vehicle, so that timely warning can be given in the design stage and then optimization and rectification can be carried out, avoiding the increase in development costs and extension of the scheme verification cycle due to friction noise of the sealing strips in the production stage, reducing the cost of abnormal noise adjustment of the whole vehicle in the later stage, and further filling the gap of real simulation and precise simulation in the existing automobile sealing strip testing.

[0057] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A sealing strip minimum abnormal noise displacement test device, Features: It includes an environmental chamber and a material compatibility test bench placed in the environmental chamber. The environmental chamber provides the tested sealing strip with the test conditions of automobile road driving environment, so that the test can better simulate the abnormal noise of the sealing strip in the real car; The material compatibility test bench is used to clamp the sealing strip and implement stick-slip motion testing of the sealing strip in multiple angle transformations and forward and backward translation states.

2. A sealing strip minimum abnormal noise displacement test device according to claim 1, Features: The material compatibility test bench includes a flip plate and a material clamping fixture. There are two flip plates symmetrically arranged, and both flip plates are rotatably connected in the environmental chamber; there are two material clamping fixtures, and the two material clamping fixtures are detachably connected to the inner sides of the two flip plates.

3. A sealing strip minimum abnormal noise displacement test device according to claim 2, Features: The material compatibility test bench is equipped with a vibration exciter, which can load the PSD random excitation road spectrum that simulates the actual vehicle abnormal noise evaluation road to excite the tested sealing strip.

4. A sealing strip minimum abnormal noise displacement test method, Features: The following steps are involved: S1, set the test conditions of the sealing strip according to the test requirements; S2, simulates the actual road driving posture of the sealing strip, measures the displacement caused by the deformation of the sealing strip itself when the sealing strip reaches the maximum static friction from the static state, and obtains the minimum displacement test result; S3, based on the minimum displacement test results, predict the abnormal noise performance of the sealing strip in the whole vehicle state. If the abnormal noise performance meets the requirements, it indicates that the relevant parameters of the sealing strip do not need to be optimized; if the abnormal noise performance does not meet the requirements, it indicates that the sealing strip abnormal noise exists and the relevant parameters need to be optimized.

5. A sealing strip minimum abnormal noise displacement test method according to claim 4, Features: In S2, the material clamping fixture on the material compatibility test bench is used to clamp the sealing strip in the actual contact mode between the sealing strip and the actual vehicle part, truly simulating the extrusion posture of the sealing strip under the actual vehicle road driving condition, and conducting a test on the minimum abnormal noise displacement.

6. A sealing strip minimum abnormal noise displacement test method according to claim 5, Features: In S2, an environmental chamber and a material compatibility test bench are used to simulate the rain exposure condition of the sealing strip and conduct a test on the minimum abnormal noise displacement.

7. A sealing strip minimum abnormal noise displacement test method according to claim 6, Features: In S2, a material compatibility test bench is used to test the minimum abnormal noise displacement under the condition of dust accumulation on the sealing strip.

8. A sealing strip minimum abnormal noise displacement test method according to claim 7, Features: In S2, an environmental chamber is used to put the sealing strip under different temperature cycle control conditions to conduct a test on the minimum abnormal noise displacement; and the control range of the cycle temperature is -20-80℃.

9. A sealing strip minimum abnormal noise displacement test method according to claim 8, Features: In S2, an environmental chamber is used to place the sealing strip under different humidity control conditions to conduct a minimum abnormal noise displacement test; and the humidity control range is 10%-90% RH.

10. A sealing strip minimum abnormal noise displacement test method according to claim 9, Features: In S2, the material compatibility test bench is used to control the different sliding speeds of the sealing strip and conduct the minimum abnormal noise displacement test; and the tested sliding speeds include 1mm / s, 2mm / s, and 4mm / s.

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