CN115435984B - A bench simulation test and analysis method for dynamic sealing performance of automobiles - Google Patents
A bench simulation test and analysis method for dynamic sealing performance of automobiles Download PDFInfo
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/24—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
本发明公开了种汽车动态密封性能的台架模拟测试分析方法，基于仿真软件获取待试验车辆在特定路段上的车身外流场压力分布图，并通过车身外流场压力分布图确定车窗和车门上各个泄漏点位置，每个泄漏点位置即测试点位置；将待试验车辆固定于四立柱台架上同时向其驾驶舱内加压，四立柱台架模拟待试验车辆在该特定路段上的路面激励，待试验车辆的车内外压差为待试验车辆在该特定路段上实际行驶时所形成的压差；在驾驶舱内放置声源，基于声源测漏仪测试每个测试点位置的声源泄漏量的大小；基于测试点位置的声源泄漏量优化密封条的结构设计。本发明能够模拟实际风噪发生的坏境，高效地对汽车的动态密封性进行分析，成本低廉，且易操作。
The present invention discloses a bench simulation test and analysis method for the dynamic sealing performance of an automobile. The method obtains the pressure distribution diagram of the flow field outside the vehicle body of the vehicle to be tested on a specific road section based on simulation software, and determines the positions of various leakage points on the windows and doors through the pressure distribution diagram of the flow field outside the vehicle body, and each leakage point position is the test point position; the vehicle to be tested is fixed on a four-column bench and pressurized into its cockpit at the same time, and the four-column bench simulates the road surface excitation of the vehicle to be tested on the specific road section, and the pressure difference between the inside and outside of the vehicle to be tested is the pressure difference formed when the vehicle to be tested actually drives on the specific road section; a sound source is placed in the cockpit, and the size of the sound source leakage at each test point position is tested based on a sound source leak detector; the structural design of the sealing strip is optimized based on the sound source leakage at the test point position. The present invention can simulate the actual environment where wind noise occurs, efficiently analyze the dynamic sealing performance of the automobile, and has low cost and is easy to operate.
Description
Technical Field
The invention discloses a test analysis method for dynamic sealing performance of an automobile, belongs to the technical field of automobile noise reduction, and particularly discloses a bench simulation test analysis method for dynamic sealing performance of an automobile and an automobile.
Background
When the automobile runs at a high speed, obvious wind noise is usually generated, and passengers in the automobile feel uncomfortable. The wind noise heard in the vehicle is directly related to the external modeling of the vehicle body and the sealing and sound insulation performance of the vehicle door opening piece, and the sealing performance of the vehicle door plays a key role. The vehicle door tightness is easy to evaluate through a sound insulation test under static state, but the vehicle door tightness is reduced due to pressure difference between the inside and the outside of the vehicle when the vehicle runs at high speed, and meanwhile, the vehicle body vibration during high-speed running can also cause the vehicle door deformation to cause the change of the tightness, so that the vehicle door tightness is difficult to evaluate at high speed.
The current test means for evaluating the sealing performance of the vehicle door is mainly carried out in an acoustic wind tunnel, the vehicle is in a fixed and static state, the wind tunnel simulates and blows out wind speed of 100-140 km/h, but the test cost is high (about 20 ten thousand in1 day), and the vibration influence of the vehicle body under high-speed dynamic state cannot be simulated.
The specification of the Chinese patent No. 104132817B discloses a detection method of a dynamic intelligent detection platform for the external characteristics of a motor vehicle, which utilizes the detection platform to simulate the motor vehicle to complete all the external characteristic indexes such as axle weight, sideslip, high-low speed braking, power, oil consumption, exhaust emission, tightness, head lamps, steering lamps, fog lamps, markers, outline and the like at one time under the conditions of various speed and load changes, different road surface butt joint, split and the like in actual running, and forms a diagrammatical curve, and an uploading network becomes public data resources for social sharing. The intrinsic factors of the vehicle are eliminated, so that the measurement ABS, EBD, ESP and the cruising constant speed system are possible, unified standards are established in the automobile industry chain for judging the external characteristics of the motor vehicle, the external characteristics are detected in links of research and development, delivery inspection, vehicle use detection, maintenance and repair and the like, and historical breakthroughs appear in fields, time, modes and management. Provides a standard for the Internet of things, public safety, energy conservation and environmental protection of automobiles in the world.
The specification of the Chinese patent CN2874457Y discloses a comprehensive detection rack for the sealing performance of a passenger cabin and the air quantity of an air conditioner of a vehicle, which consists of a variable frequency fan, a circulating pipeline, a large-flow pipeline and a small-flow pipeline, wherein the small-flow pipeline is connected with the large-flow pipeline in parallel, a large valve and a large flowmeter are arranged in the large-flow pipeline, the small valve and the small flowmeter are arranged on the small-flow pipeline, the inlet end of the large-flow pipeline is communicated with the air outlet of the variable frequency fan, an air inlet pipeline is connected to the air inlet in the variable frequency fan, and the circulating pipeline is arranged between the air inlet pipeline and the large-flow pipeline. The utility model utilizes the air outlet of the variable frequency fan to supply air to the vehicle cabin, can measure the sealing performance of the cabin by detecting the air supply flow and the pressure of the vehicle cabin, and can accurately measure the air quantity of the air conditioner of the vehicle cabin by utilizing the suction and pumping actions of the variable frequency fan to offset the resistance of the pipeline and the resistance of the flowmeter so that the air conditioner is in normal back pressure.
The comparison document 1 (CN 104132817B) can be used for simulating the motor vehicle to be butted with different road surfaces at various speeds and load changes in actual running by utilizing a detection platform, the comparison document 2 (CN 2874457Y) discloses a structure and a method for statically testing the sealing performance of the passenger cabin of the passenger vehicle, but the combination of the comparison document 1 and the comparison document 2 has no technical teaching on the invention, the problem of carrying out dynamic sealing performance test on the vehicle based on a rack is that if the leakage test point of the vehicle is accurately obtained, because the leakage point of the running state of the vehicle is completely different from the leakage point of the static state, if the leakage amount test is carried out by directly using the test point of the static state under the dynamic test environment, the leakage amount data of the vehicle cannot be accurately simulated, so that the optimized direction of the design structure of a vehicle door and a sealing strip cannot be accurately guided, and the high-speed dynamic sealing performance of the vehicle is improved.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a bench simulation test analysis method for the dynamic sealing performance of an automobile, which can simulate the environment where actual wind noise occurs, and can be used for detecting leakage of each leakage point by utilizing ultrasonic waves, so that the dynamic sealing performance of the automobile can be efficiently analyzed, and the method is low in cost and easy to operate.
The invention discloses a bench simulation test analysis method for dynamic sealing performance of an automobile, which comprises the steps of obtaining an automobile body outflow field pressure distribution diagram of the automobile to be tested on a specific road section based on simulation software, determining the positions of various leakage points on an automobile window and an automobile door of the automobile to be tested through the automobile body outflow field pressure distribution diagram, fixing the automobile to be tested on a four-column bench, simultaneously pressurizing a cockpit of the automobile to be tested, simulating road surface excitation of the automobile to be tested on the specific road section by the four-column bench, setting a sound source in the cockpit, testing the leakage amount of the sound source at each test point based on a sound source leakage meter, and optimizing the structural design of a sealing strip based on the leakage amount of the sound source at the test point.
In a preferred embodiment of the invention, the method for determining the positions of the vehicle window and each leakage point on the vehicle door of the vehicle to be tested based on the vehicle body outflow field pressure distribution map comprises the steps of selecting the positions of the test points positioned at the edge of the vehicle door frame and the edge of the vehicle window, selecting the positions of the test points with the pressure between-2300 pa and 100pa, and enabling the interval between any two adjacent test point positions to be 200mm.
In a preferred embodiment of the invention, the method for acquiring the road surface excitation of the vehicle to be tested on the specific road section comprises the steps of attaching 4 three-way vibration acceleration sensors to the front wheel and the rear wheel of the vehicle to be tested respectively, connecting the three-way vibration acceleration sensors with LMS data acquisition equipment, acquiring the road surface excitation signals of the vehicle to be tested on the specific road section at the speed of 140km/h at the vibration acquisition frequency of 4000Hz, and acquiring the road surface excitation signals for 20s.
In a preferred embodiment of the present invention, the pressure in the cabin of the vehicle to be tested is increased based on the leakage amount measuring device, and the internal-external pressure difference is 70 to 110Pa.
In a preferred embodiment of the invention, the leakage testing device comprises a pressure gauge, a blower and a blower pipe, which is connected in a sealing manner to an opening in a sunroof or side window of the vehicle to be tested.
In a preferred embodiment of the invention, when the four-column rack is not in operation, the vehicle is in a static working condition, a sound source is placed in the cockpit, the magnitude Q1 of the leakage amount of the sound source under the static working condition is tested based on the sound source leakage detector, when the four-column rack is in operation, the vehicle is in a simulation working condition, the sound source is placed in the cockpit, the magnitude Q2 of the leakage amount of the sound source under the simulation working condition is tested based on the sound source leakage detector, the leakage amount change difference value is calculated, and delta=Q2-Q1.
In a preferred embodiment of the invention, the method for testing the leakage amount of the sound source at each test point based on the sound source leakage tester comprises the following steps of S1, placing the sound source at a front gear shifting handle, testing the leakage amount of the sound source at each test point on a front door frame and a front car window, S2, placing the sound source at the middle of a rear seat, and testing the leakage amount of the sound source at each test point on the rear door frame and the rear car window.
In a preferred embodiment of the invention, the test point positions are dynamically sealed up to be qualified when the corresponding delta <3 of the test point positions, and the dynamic seal corresponding to the test point positions is not qualified when the corresponding delta >3 of the test point positions.
In a preferred embodiment of the present invention, the method for optimizing the structural design of the weather strip based on the leakage amount of the sound source at the test point position comprises:
S1, performing leakage quantity test and leakage difference calculation with a fixed width and a variable height, and inputting a corresponding table;
s2, performing leakage quantity test and leakage difference calculation of a fixed height and a variable width, and recording a corresponding table;
S3, performing a leakage amount test and a leakage difference value calculation of the fixed-width fixed-height variable hardness, and inputting a corresponding table;
S4, performing multiple linear regression processing on the data recorded in the tables of S1, S2 and S3 in data processing software to obtain the relation between the leakage amount and the width, height and hardness, wherein a fitting curve is as follows:
Δ=a1*H+a2*L+a3*S+b
Wherein a1, a2 and a3 are partial regression coefficients of regression processing, and b is intercept.
In a preferred embodiment of the present invention, the leak difference values of the plurality of leak measurement points are averaged in evaluating the sealing effect of the sealing strips of different sizes and hardness.
The simple vehicle door dynamic tightness test analysis method has the advantages that a road surface excitation signal under the speed of 140kmh is collected by a real vehicle, the signal is loaded on a four-column rack of the whole vehicle to simulate road surface excitation, the vehicle body leakage measurement position is selected according to the simulation analysis pressure distribution of a vehicle body flow field, the vehicle door is completely closed, the pressure difference between the inside and the outside of the vehicle when the vehicle runs at high speed is added into the vehicle by using a leakage test system, a sound source is placed in the middle of a secondary instrument and a rear seat in the vehicle, the leakage situation of the edges of a door frame and a vehicle window of the vehicle is tested by using an ultrasonic leakage tester, the difference between the leakage quantity and the sealing strip parameters under the action static state is changed by using a linear regression method, the direction of optimizing the design structure of the vehicle door and the sealing strip is guided, and the high-speed dynamic tightness performance of the vehicle is improved.
Drawings
FIG. 1 is a graph of the pressure distribution of the flow field outside the vehicle body of a bench simulation test analysis method for dynamic sealing performance of an automobile;
FIG. 2 is a schematic diagram of various leak points of a bench simulation test analysis method for dynamic sealing performance of an automobile according to the invention;
FIG. 3 is a schematic diagram of a four-column bench for a bench simulation test analysis method of dynamic sealing performance of an automobile in accordance with the present invention;
FIG. 4 is a schematic view of a leak testing apparatus of a bench simulation test analysis method for dynamic sealing performance of an automobile according to the invention;
FIG. 5 is a schematic diagram of a seal strip of a bench simulation test analysis method of dynamic sealing performance of an automobile according to the invention;
In the figure, the glass of the A-back door, the glass of the B-front door, the glass of the C-back door, the D-front door and the E-excitation table;
f-four upright column excitation control console, G-blast pipe, H-blast blower, I-press, J-car window opening, K-installation clamping position and S-compression sealing position.
Detailed Description
The following describes the invention in further detail, including preferred embodiments, by way of the accompanying drawings and by way of examples of some alternative embodiments of the invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
The invention discloses a bench simulation test analysis method for dynamic sealing performance of an automobile, which comprises the steps of obtaining an automobile body outflow field pressure distribution diagram of the automobile to be tested on a specific road section based on simulation software, determining the positions of various leakage points on an automobile window and an automobile door of the automobile to be tested through the automobile body outflow field pressure distribution diagram, fixing the automobile to be tested on a four-column bench, simultaneously pressurizing a cockpit of the automobile to be tested, simulating road surface excitation of the automobile to be tested on the specific road section by the four-column bench, setting a sound source in the cockpit, testing the leakage amount of the sound source at each test point based on a sound source leakage meter, and optimizing the structural design of a sealing strip based on the leakage amount of the sound source at the test point.
Preferably, the method for determining the positions of the vehicle window and each leakage point on the vehicle door of the vehicle to be tested based on the vehicle body outflow field pressure distribution diagram comprises the steps of selecting the positions of the test points on the edge of the vehicle door frame and the edge of the vehicle window, selecting the positions of the test points with the pressure of-2300-100 pa, and enabling the interval between any two adjacent test point positions to be 200mm.
Preferably, the method for acquiring the road surface excitation of the vehicle to be tested on the specific road section comprises the steps of respectively attaching 4 three-way vibration acceleration sensors to the front wheel and the rear wheel of the vehicle to be tested, connecting the three-way vibration acceleration sensors with LMS data acquisition equipment, acquiring road surface excitation signals of the vehicle to be tested on the specific road section at the speed of 140km/h at the vibration acquisition frequency of 4000Hz, and acquiring the road surface excitation signals for 20s.
Preferably, the leakage amount-based test device is used for pressurizing the inside of the cockpit of the vehicle to be tested, and the internal and external pressure difference is 70-110 Pa.
Preferably, the leakage amount testing device comprises a pressure gauge, a blower and a blower pipe, wherein the blower pipe is in sealing connection with an opening on a skylight or a side window of the vehicle to be tested.
Preferably, when the four-column rack is not in operation, the vehicle is in a static working condition, a sound source is placed in a cockpit, the magnitude Q1 of the leakage amount of the sound source under the static working condition is tested based on a sound source leakage detector, when the four-column rack is in operation, the vehicle is in a simulation working condition, the sound source is placed in the cockpit, the magnitude Q2 of the leakage amount of the sound source under the simulation working condition is tested based on the sound source leakage detector, the leakage amount change difference value is calculated, and delta=Q2-Q1.
The method for testing the leakage amount of the sound source at each test point based on the sound source leakage meter preferably comprises the following steps of S1, placing the sound source at a front row gear shifting handle, testing the leakage amount of the sound source at each test point on a front door frame and a front car window, S2, placing the sound source at the middle of a rear row seat, and testing the leakage amount of the sound source at each test point on the rear door frame and the rear car window.
Preferably, when delta <3 corresponding to the test point position, the test point position is dynamically sealed and qualified, and when delta >3 corresponding to the test point position, the dynamic seal corresponding to the test point position is not qualified.
Preferably, the method for optimizing the structural design of the sealing strip based on the sound source leakage amount of the test point position comprises the following steps:
S1, performing leakage quantity test and leakage difference calculation with a fixed width and a variable height, and inputting a corresponding table;
s2, performing leakage quantity test and leakage difference calculation of a fixed height and a variable width, and recording a corresponding table;
S3, performing a leakage amount test and a leakage difference value calculation of the fixed-width fixed-height variable hardness, and inputting a corresponding table;
S4, performing multiple linear regression processing on the data recorded in the tables of S1, S2 and S3 in data processing software to obtain the relation between the leakage amount and the width, height and hardness, wherein a fitting curve is as follows:
Δ=a1*H+a2*L+a3*S+b
Where a1, a2, a3 are the partial regression coefficients (pre-calibrated) of the regression process, and b is the intercept.
Preferably, when evaluating the sealing effect of sealing strips of different sizes and hardness, the leakage difference values of a plurality of leakage measurement points are averaged.
According to the invention, the dynamic sealing performance of the automobile running at high speed is simulated and tested and evaluated through the bench, the road spectrum is loaded on a four-column bench, the leakage test position is selected by adopting the simulation of the vehicle body flow field, the leakage test and analysis are carried out by using an ultrasonic leakage test system, and the relation between the leakage quantity and the width, the height and the hardness of the sealing strip is obtained by replacing different sealing strips, so that the method has important engineering application and practical guiding values, reduces the development period and the cost, and guides the detailed steps of the sealing strip design as follows:
The first step, 4 three-way vibration acceleration sensors are respectively stuck on the front wheel and the rear wheel of the vehicle, the sensors are connected with LMS data acquisition equipment, the vibration acquisition frequency range is set to 4000Hz, the driving vehicle is driven to acquire road spectrum on a straight smooth asphalt pavement at the speed of 140km/h, the acquisition time is 20s, and signals are stored.
Secondly, modeling simulation is carried out on the CFD software of the whole vehicle, actran software is adopted to extract the surface pressure of the vehicle body, and a pressure distribution diagram (color cloud picture) of a flow field outside the vehicle body is obtained, so that the pressure distribution situation of the vehicle window and the vehicle door is determined, and as shown in figure 1, the pressure distribution is mainly in-2467 pa-428 pa. A larger value indicates a larger external pressure, a tighter door is pressed, which is advantageous for sealing, and a smaller value indicates a larger internal pressure, which causes the door to open outwardly, and the seal becomes worse. As shown in fig. 2, according to the above pressure distribution, 19 test positions are selected (it should be noted that 19 positions are only one example, and there may be more than 19 or less than 19 test point positions of a vehicle of a specific vehicle type, and the selection principle includes that 1, positions of a door frame edge and a window edge are selected (the positions are analyzed in design to have leakage, a door sealing strip leaks, a window glass water cut leaks, and other metal plates are not leaked), 2, positions of a pressure between-2300 pa to 100pa are selected, and 3, the test point positions are spaced by 200 mm).
And thirdly, fixing the vehicle on a four-upright-column rack, placing a sound source for ultrasonic leakage detection at a front row gear shifting handle, testing leakage quantity of each measuring point on a front door frame and a front vehicle window, then placing the sound source at the middle of a rear row seat, and testing leakage quantity of each measuring point on the rear door frame and the rear vehicle window, wherein the state leakage quantity is recorded as Q1, and the state leakage quantity is a vehicle door sealing performance test result under a static condition as shown in table 1.
And fourthly, loading a tested smooth asphalt road spectrum (as shown in an example of fig. 3) on a four-column bench, circularly and continuously loading road spectrum signals of 20s, perforating a skylight or a side window by using a leakage amount testing device, pressurizing by using a blower (as shown in fig. 4, requiring that the edge of the skylight or the side window is completely sealed by greasy or adhesive tape) until the pressure difference between the inside and the outside of the vehicle reaches 100Pa (the pressure difference between the inside and the outside of the vehicle is about 70-110 Pa when the vehicle runs at a high speed), and repeating the testing method in the third step, wherein a leakage amount testing result Q2 is recorded in a table 1, and is a dynamic sealing testing result when the vehicle runs on the smooth asphalt road.
Fifth, the differential leakage amount is calculated, delta=q2-Q1, and the results are shown in table 1, wherein the larger differential measurement point indicates the position with poor dynamic seal. Empirically, if delta <3, it is indicated that the dynamic seal is good and no improvement is required, if 3< delta <6, it is indicated that the structural design needs fine tuning, and if delta >6, it is indicated that the structural design has defects, a large structural adjustment is required.
Table 1 ultrasonic leakage recording table
Sixth, the sealing strip plays a key role in dynamic sealing, the structure is shown in fig. 5, and the influence factors of the sealing strip performance are mainly the compressed section height H, the compressed section width L and the sealing strip rubber hardness S. The leakage detection test is carried out by replacing the sealing strip patterns with different structural sizes and hardness, and as the vehicle door sealing strips are generally of uniform cross section, when the sealing effect of the sealing strips with different sizes and hardness is evaluated, the leakage difference values of 19 leakage measurement points need to be averaged. The method comprises the steps of firstly performing a constant-width and variable-height leakage amount test and a leakage difference value calculation, recording in table 2, then performing a constant-height and variable-width leakage amount test and a leakage difference value calculation, recording in table 3, and finally performing a constant-width and constant-height and variable-hardness leakage amount test and a leakage difference value calculation, and recording in table 4.
Seventh, performing multiple linear regression processing on the data in excel to obtain the relation between the leakage quantity and the width, the height and the hardness, wherein a fitting curve is as follows:
Δ=a1*H+a2*L+a3*S+b
Wherein a1, a2 and a3 are partial regression coefficients of regression processing, and b is intercept.
Table 2 sealing strip constant width leakage recording table
Table 3 sealing strip height leakage recording table
Table 4 sealing strip height leakage recording table
It will be readily understood by those skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention and that no limitations are intended to the scope of the invention, except insofar as modifications, combinations, substitutions, improvements or the like may be made within the spirit and principles of the invention.
Claims (6)
1. The bench simulation test analysis method for the dynamic sealing performance of the automobile is characterized by simulating the environment where actual wind noise occurs, utilizing ultrasonic waves to detect leakage of each leakage point, analyzing the dynamic sealing performance of the automobile, acquiring an automobile body outflow field pressure distribution diagram of the automobile to be tested on a specific road section based on simulation software, and determining the positions of each leakage point on the automobile window and the automobile door of the automobile to be tested, wherein the positions of each leakage point are the positions of test points; the method comprises the steps of fixing a vehicle to be tested on a four-column rack, pressurizing the vehicle to be tested in a cockpit, simulating road surface excitation of the vehicle to be tested on a specific road section by the four-column rack, placing a sound source in the cockpit, testing the magnitude of sound source leakage of each test point position based on a sound source leakage tester, optimizing the structural design of a sealing strip based on the sound source leakage of the test point position, placing the sound source in the cockpit under a static working condition when the four-column rack is not in operation, testing the magnitude Q1 of the sound source leakage of each test point position under the static working condition based on the sound source leakage tester, placing the sound source in the cockpit under a simulated working condition when the four-column rack is in operation, testing the magnitude Q2 of the sound source leakage of each test point position under the simulated working condition based on the sound source leakage tester, calculating the difference value of the leakage change, wherein Q2-Q1 is calculated, dynamically sealing the test point position is qualified when the test point position corresponds to the test point position is less than 3, the method for optimizing the structural design of the sealing strip based on the sound source leakage quantity of the test point position comprises the following steps:
s1, performing leakage quantity test and leakage difference calculation with a fixed width and a variable height, and recording a corresponding table;
S2, performing leakage quantity test and leakage difference calculation of a fixed height and a variable width, and recording a corresponding table;
S3, performing a leakage amount test and a leakage difference value calculation of the fixed-width fixed-height variable hardness, and inputting a corresponding table;
S4, performing multiple linear regression processing on the data recorded in the tables of S1, S2 and S3 in data processing software to obtain the relation between the leakage amount and the width, height and hardness, wherein a fitting curve is as follows:
Δ= a1*H+ a2*L+ a3*S+b
wherein a1, a2 and a3 are partial regression coefficients of regression processing, and b is intercept;
and when the sealing effect of the sealing strips with different sizes and hardness is evaluated, carrying out average treatment on leakage difference values of a plurality of leakage measuring points.
2. The bench simulation test analysis method for dynamic sealing performance of an automobile, which is characterized in that the method for determining the positions of the window and each leakage point on the door of the automobile to be tested based on an automobile body outflow field pressure distribution diagram comprises the steps of selecting the positions of test points on the edge of a door frame and the edge of the window, selecting the positions of the test points with the pressure of-2300-100 pa, and enabling the interval between any two adjacent test point positions to be 200mm.
3. The bench simulation test analysis method for dynamic sealing performance of automobile according to claim 1, wherein the method for obtaining road surface excitation of the automobile to be tested on the specific road section comprises the steps of attaching 4 three-way vibration acceleration sensors to front and rear wheels of the automobile to be tested respectively, connecting the three-way vibration acceleration sensors with LMS data acquisition equipment, wherein the vibration acquisition frequency is 4000Hz, and driving the automobile to be tested to acquire road surface excitation signals on the specific road section at the speed of 140km/h for 20s.
4. The bench simulation test analysis method for dynamic sealing performance of an automobile according to claim 1, wherein the pressure in a cockpit of the automobile to be tested is increased based on the leakage amount test device, and the internal and external pressure difference is 70-110 Pa.
5. The method for testing and analyzing the dynamic sealing performance of the automobile by using the bench simulation test according to claim 4, wherein the leakage testing device comprises a pressure gauge, a blower and a blast pipeline, and the blast pipeline is in sealing connection with an opening on a skylight or a side window of the automobile to be tested.
6. The bench simulation test analysis method for dynamic sealing performance of automobile according to claim 1, wherein the method for testing the leakage amount of the sound source at each test point based on the sound source leakage detector comprises the steps of S1, placing the sound source at a front row gear shifting handle to test the leakage amount of the sound source at each test point on a front door frame and a front automobile window, S2, placing the sound source at the middle of a rear seat to test the leakage amount of the sound source at each test point on the rear door frame and the rear automobile window.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211151603.2A CN115435984B (en) | 2022-09-21 | 2022-09-21 | A bench simulation test and analysis method for dynamic sealing performance of automobiles |
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