A Method for Analyzing the Dynamic Deformation and Sound Insulation Quantity of a Car Door Seal

Abstract

The present invention belongs to the technical field of vibration control engineering, and particularly relates to a method for analyzing the dynamic deformation and sound insulation quantity of a car door sealing strip. The method for analyzing the dynamic deformation and sound insulation quantity of the car door sealing strip can be used to optimize the structure of the car door sealing strip, which can not only enhance the sound insulation effect of the car door sealing strip so as to achieve the purpose of reducing the interior noise level of the car, but also meet the development requirements of cost control and lightweight. The method for analyzing the dynamic deformation and sound insulation quantity of the car door sealing strip includes steps such as obtaining the two-dimensional geometric model of the cross-section of the first-stage car door sealing strip and the two-dimensional geometric model of the cross-section of the second-stage car door sealing strip, establishing the nonlinear finite element model of the first-stage car door sealing strip and the second-stage car door sealing strip, calculating the pressure load curve of the first-stage car door sealing strip and the second-stage car door sealing strip, establishing the boundary conditions of the diffuse sound field, calculating the static sound insulation quantity of the first-stage car door sealing strip and the second-stage car door sealing strip, and solving to obtain the fluid pressure pulsation load information on the car door surface at different times.

Description

Technical Field

[0001] The present invention belongs to the technical field of vibration control engineering, and particularly relates to a method for analyzing the dynamic deformation and sound insulation of a car door sealing strip. Background Art

[0002] With the effective control of powertrain noise and tire / road noise and the continuous increase in vehicle speed, wind noise has become one of the main noise sources of current high-speed vehicles; at higher driving speeds, the energy of automotive wind noise will increase approximately to the sixth power of the vehicle speed; while the growth of other noises with vehicle speed is much lower than that of wind noise, which leads to wind noise becoming an important noise source of the vehicle. Wind noise not only affects the riding comfort of passengers inside the vehicle but also affects the sound environment outside the vehicle. Reducing the interior noise of the vehicle requires comprehensive measures, including reducing the noise source and improving the sound insulation performance of the vehicle body structure, etc., and the use of sealing strips is an important measure to improve the overall sound insulation performance of the vehicle body, which can effectively suppress the entry of air-borne sound into the vehicle.

[0003] The sealing strip has a dynamic sealing effect on the vehicle, and the main factors affecting dynamic sealing are as follows:

[0004] (1) Component stiffness: When the vehicle is driving at high speed, negative pressure will appear in some local areas on the vehicle body surface, which will push the moving components (such as the door frame) to deform outward, forming a gap between the door frame and the vehicle body;

[0005] (2) Seal deformation: The internal and external pressure difference flowing through the vehicle body surface will cause the seal deformation to decrease;

[0006] (3) Sealing position: The pressures and flow characteristics outside the vehicle body corresponding to different sealing positions are also different. For areas with large negative pressure and turbulence, such as areas near the rearview mirror, A-pillar, and B-pillar, etc., should be strictly sealed, and the position near the passenger's ear should also be strictly controlled because the wind noise transmission path is short;

[0007] (4) Seal shape: Different cross-sectional shapes, thicknesses, and contact forms of the seal with the vehicle body components will affect the compression amount and sound insulation amount of the seal to varying degrees.

[0008] It should be noted that, in order to solve the above-mentioned wind noise problem, technicians have made many attempts. For example, in the patent document with the application number: CN201710264545.7 and the patent title: A method for measuring and optimizing the sound insulation of a car door sealing strip considering the influence of the compression state, a method for measuring and optimizing the sound insulation of a car door sealing strip is recorded. This method includes the following steps: (1) Establish a finite element simulation model of the closed compression of the car door - sealing strip - car frame to conduct simulation of the closed compression; (2) Obtain the geometric state of the sealing strip after the closed compression deformation; (3) Quantify the compression state of each sealed sound insulation section; (4) Input the quantified value of the compression state of the sealed sound insulation section, and establish a finite element - infinite element sealed sound insulation model based on the double - layer plate sound insulation principle; (5) Conduct sound insulation simulation through the sound insulation model to obtain the sound insulation amount of the corresponding sealed sound insulation section; (6) Establish a regression model between the sound insulation amount of each sealed sound insulation section and the quantified value of the compression state; (7) Optimize the sealing strip according to the regression model. Compared with the prior art, the present invention considers the closed compression deformation after the car door is closed, making the measurement results more in line with the actual situation and better supporting the optimization of the car door sound insulation.

[0009] However, after further research, the inventors found that since dynamic sealing involves many factors and is a typical multi - disciplinary physical field problem, it is still necessary for those skilled in the art to continue to optimize the prior art including the above examples, so as to further provide a more optimized calculation and analysis method, thereby quickly predicting the dynamic sealing performance of the car door, analyzing the influence of many parameters on the sound insulation performance, and providing simulation data support for the engineer to optimize the design of the vehicle dynamic sealing system. Summary of the Invention

[0010] The present invention provides a method for analyzing the dynamic deformation and sound insulation amount of a car door sealing strip. This method for analyzing the dynamic deformation and sound insulation amount of a car door sealing strip can be used to optimize the structure of the car door sealing strip. It can not only enhance the sound insulation effect of the car door sealing strip, thereby achieving the purpose of reducing the interior noise level of the car, but also meet the development needs of cost control and lightweight, and has certain practical significance for the development and cost control of vehicles.

[0011] To solve the above - mentioned technical problems, the present invention adopts the following technical solutions:

[0012] A method for analyzing the dynamic deformation and sound insulation amount of a car door sealing strip includes the following steps:

[0013] Step 1: Obtain the two - dimensional geometric model of the cross - section of the first - stage car door sealing strip and the two - dimensional geometric model of the cross - section of the second - stage car door sealing strip;

[0014] Step 2: Establish a non - linear finite element model of the first - stage car door sealing strip and the second - stage car door sealing strip;

[0015] Step 3: Based on the non-linear finite element models of the first-stage door seal strip and the second-stage door seal strip obtained in Step 2, calculate the pressure load curves of the first-stage door seal strip and the second-stage door seal strip;

[0016] Step 4: Establish the boundary conditions of the diffuse sound field;

[0017] Step 5: Based on the boundary conditions of the diffuse sound field obtained in Step 4, use the acoustic finite element calculation model to calculate the static sound insulation of the first-stage door seal strip and the second-stage door seal strip;

[0018] Step 6: Establish an external flow field calculation model during vehicle driving; Solve to obtain the fluid pressure pulsation load information on the door surface at different times;

[0019] Step 7: Based on the shape function interpolation algorithm, interpolate the fluid pressure pulsation load information obtained in Step 6 onto the door structure finite element model to obtain the pressure load information of the door structure finite element model;

[0020] Step 15: Set the static calculation and solution parameters for the door structure finite element model;

[0021] Step 8: Calculate and extract the deformation of the door structure finite element model under the action of fluid pressure;

[0022] Step 9: Calculate the dynamic deformation of the first-stage door seal strip and the second-stage door seal strip;

[0023] Step 10: Based on the dynamic deformation of the first-stage door seal strip and the second-stage door seal strip obtained in Step 9, establish an acoustic-solid coupling calculation model of the deformed first-stage door seal strip and the second-stage door seal strip;

[0024] Step 11: Calculate the true sound insulation of the first-stage door seal strip and the second-stage door seal strip after dynamic deformation.

[0025] More preferably, it further includes:

[0026] Step 13: Statistically analyze the deformation and sound insulation of different cross-sections of the first-stage door seal strip and the second-stage door seal strip under dynamic conditions;

[0027] Form a database containing the deformation and sound insulation of different cross-sections of the first-stage door seal strip and the second-stage door seal strip under dynamic conditions.

[0028] More preferably, the steps of establishing the non-linear finite element models of the first-stage door seal strip and the second-stage door seal strip in Step 2 can be described as:

[0029] Obtain the stress-strain curve of the rubber through uniaxial compression and equi-biaxial tension experiments;

[0030] The stress-strain curve of the rubber is fitted by using the Mooney-Rivilin constitutive model to obtain the parameters C 01 and C 10 values;

[0031] The obtained C 01 and C 10 values are used as the material parameters of the nonlinear finite element model of the first-stage door seal and the second-stage door seal;

[0032] Compressive displacements and constrained boundary conditions are respectively applied to the contact areas of the first-stage door seal, the second-stage door seal with the door and the door frame to simulate the compression effect during the door closing process.

[0033] More preferably, it is characterized in that it further includes step 31:

[0034] After step 3 is completed, as Figure 4 shown, the load-pressure curve of the first-stage door seal and the second-stage door seal obtained in step 3 is tested by experiments to verify the nonlinear finite element model of the first-stage door seal and the second-stage door seal obtained in step 2.

[0035] More preferably, the diffusion sound field boundary conditions established in step 4 satisfy:

[0036] ;

[0037] where Pn(r, t) represents plane waves of different phases;

[0038] More preferably, it further includes step 51:

[0039] After step 5 is completed, based on the diffusion sound field boundary conditions obtained in step 4, the static sound insulation curve of the first-stage door seal and the second-stage door seal obtained in step 5 is tested by experiments to verify the acoustic finite element calculation model used in step 5.

[0040] More preferably, it further includes step 91:

[0041] After step 9 is completed, the deformation amount of the door structure finite element model obtained in step 9 under the action of fluid pressure is tested by experiments to verify the door structure finite element model used in step 7.

[0042] More preferably, the dynamic deformation amounts of the first-stage door seal and the second-stage door seal in step 10 satisfy:

[0043] Dynamic deformation of the first-stage door seal strip and the second-stage door seal strip = Static deformation in the door closed state - Deformation of the door under the action of the external flow field pressure

[0044] The present invention provides a method for analyzing the dynamic deformation and sound insulation of door seal strips. This method for analyzing the dynamic deformation and sound insulation of door seal strips includes obtaining the two-dimensional geometric model of the cross-section of the first-stage door seal strip and the two-dimensional geometric model of the cross-section of the second-stage door seal strip, establishing the nonlinear finite element model of the first-stage door seal strip and the second-stage door seal strip, calculating the pressure load curves of the first-stage door seal strip and the second-stage door seal strip, establishing the boundary conditions of the diffuse sound field, calculating the static sound insulation of the first-stage door seal strip and the second-stage door seal strip, solving to obtain the fluid pressure pulsation load information at different times on the door surface, obtaining the pressure load information of the finite element model of the door structure, setting the static calculation and solution parameters for the finite element model of the door structure, calculating and extracting the deformation of the finite element model of the door structure under the action of fluid pressure, calculating the dynamic deformation of the first-stage door seal strip and the second-stage door seal strip, establishing the acoustic-solid coupling calculation model of the deformed first-stage door seal strip and the second-stage door seal strip, calculating the actual sound insulation of the first-stage door seal strip and the second-stage door seal strip after generating dynamic deformation, and other steps.

[0045] The method for analyzing the dynamic deformation and sound insulation of door seal strips with the above step characteristics has at least the following features:

[0046] (1). Starting from numerical calculation methods, the invention proposes a calculation method for quickly predicting the dynamic deformation and sound insulation analysis of doors, which can be used as an auxiliary for the dynamic seal design of doors.

[0047] (2). The invention only uses the two-dimensional cross-section model of the seal strip as the input, the processing model is simple, and the calculation efficiency is very high, so it is very convenient to integrate into the industrial design process.

[0048] (3). Through multi-disciplinary and multi-physical field coupling simulation analysis means, the dynamic deformation and sound insulation of the door under high-speed driving conditions are calculated to obtain the deformation and sound insulation of the door under the action of internal and external pressure differences. Compared with the static seal, the simulation results are more in line with the actual situation and the calculation accuracy is higher;

[0049] (4). A large number of experimental analysis means are introduced into the analysis method to verify the simulation analysis model, ensuring the reliability and accuracy of the calculation method, and having good guiding significance for the early NVH design of vehicle seals. Description of the Drawings

[0050] The attached drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the following drawings:

[0051] Figure 1 It is a schematic flow chart of the method for analyzing the dynamic deformation and sound insulation of the door seal strip of the present invention;

[0052] Figure 2 It is a schematic diagram of the non-linear finite element model of the first-stage door seal strip and the second-stage door seal strip of the door based on the establishment;

[0053] Figure 3 For Figure 2 It is a schematic diagram for checking and analyzing the data of the non-linear finite element model of the first-stage door seal strip and the second-stage door seal strip of the door shown;

[0054] Figure 4 It is a simulation schematic diagram of applying compressive displacement and constraint boundary conditions to the contact areas of the first-stage door seal strip, the second-stage door seal strip, the door and the door frame during the door closing process;

[0055] Figure 5 It is a comparison chart of the transmission loss after compression of the door seal strip and the test value. Specific implementation mode

[0056] The present invention provides a method for analyzing the dynamic deformation and sound insulation of a door seal strip. This method for analyzing the dynamic deformation and sound insulation of a door seal strip can be used to optimize the structure of the door seal strip. It can not only enhance the sound insulation effect of the door seal strip, thereby achieving the purpose of reducing the interior noise level of the vehicle, but also meet the development needs of cost control and lightweight, and has certain practical significance for the development of vehicles and cost control.

[0057] Example 1

[0058] The present invention provides a method for analyzing the dynamic deformation and sound insulation of a door seal strip. As Figure 1 shown, it includes the following steps:

[0059] Step 1: Obtain the two-dimensional geometric model of the cross-section of the first-stage door seal strip and the two-dimensional geometric model of the cross-section of the second-stage door seal strip;

[0060] Step 2: As Figure 2 shown, establish the non-linear finite element model of the first-stage door seal strip and the second-stage door seal strip;

[0061] It should be added that this non-linear finite element model refers to the non-linear finite element model based on the material non-linearity and geometric large deformation non-linearity of the first-stage door seal strip and the second-stage door seal strip.

[0062] Among them, as a relatively preferred implementation mode of the present invention, the steps of establishing the non-linear finite element model of the first-stage door seal strip and the second-stage door seal strip in Step 2 can be further specifically described as:

[0063] The stress-strain curves of the rubber are obtained through uniaxial compression and equibiaxial tensile experiments;

[0064] The Mooney-Rivilin constitutive model is used to fit the stress-strain curves of the rubber, and the parameters C 01 and C 10 values of the fitting curve of the Mooney-Rivilin constitutive model are obtained;

[0065] The obtained C 01 and C 10 values are used as the material parameters of the nonlinear finite element models of the first-stage door seal and the second-stage door seal;

[0066] As shown Figure 4 , compressive displacements and constrained boundary conditions are respectively applied to the contact areas between the first-stage door seal, the second-stage door seal and the door and the door frame to simulate the compression effect during the door closing process.

[0067] Step 3: Based on the nonlinear finite element models of the first-stage door seal and the second-stage door seal obtained in Step 2, calculate the pressure-load curves of the first-stage door seal and the second-stage door seal;

[0068] Step 4: Establish the diffuse sound field boundary conditions;

[0069] As a relatively preferred embodiment of the present invention, the diffuse sound field boundary conditions established in Step 4 satisfy:

[0070] ;

[0071] where Pn(r,t) represents plane waves of different phases.

[0072] Step 5: Based on the diffuse sound field boundary conditions obtained in Step 4, use the acoustic finite element calculation model to calculate the static sound insulation of the first-stage door seal and the second-stage door seal;

[0073] It should be added that the static sound insulation refers to the compression amount generated by the closed door in a stationary state.

[0074] Step 6: Establish an external flow field calculation model during vehicle driving; solve to obtain the fluid pressure pulsation load information on the door surface at different times;

[0075] It should be added that the fluid pressure pulsation load information refers to the fluid pressure pulsation load generated on the door surface due to aerodynamics during vehicle driving.

[0076] Step 7: Based on the shape function interpolation algorithm, interpolate the fluid pressure pulsation load information obtained in Step 6 onto the finite element model of the door structure to obtain the pressure load information of the finite element model of the door structure;

[0077] Step 8: Set the static calculation and solution parameters for the finite element model of the door structure;

[0078] It should be added that the process of setting the static calculation and solution parameters for the finite element model of the door structure can be specifically described as follows: First, apply the fluid pulsation pressure load on the door surface; then apply the constraint boundary conditions at the door installation points; finally, select the corresponding solver for solution calculation according to actual requirements, and finally output the obtained results.

[0079] Step 9: Calculate and extract the deformation amount of the finite element model of the door structure under the action of the fluid pressure;

[0080] Step 10: Calculate the dynamic deformation amounts of the first-stage door seal and the second-stage door seal of the door;

[0081] As a relatively preferred embodiment of the present invention, the dynamic deformation amounts of the first-stage door seal and the second-stage door seal of the door in Step 10 satisfy:

[0082] The dynamic deformation amounts of the first-stage door seal and the second-stage door seal of the door = the static deformation amount in the door closed state - the deformation amount of the door under the action of the external flow field pressure.

[0083] Step 11: Based on the dynamic deformation amounts of the first-stage door seal and the second-stage door seal of the door obtained in Step 10, establish an acoustic-solid coupling calculation model of the deformed first-stage door seal and the second-stage door seal of the door;

[0084] Step 12: Calculate the true sound insulation amount of the first-stage door seal and the second-stage door seal of the door after generating dynamic deformation.

[0085] Embodiment 2

[0086] Embodiment 2 includes all the technical features of Embodiment 1; in addition, Embodiment 2 further defines Step 13.

[0087] Specifically, Step 13 can be described as: As Figure 5 shown, count the deformation amounts and sound insulation amounts of different cross-sections of the first-stage door seal and the second-stage door seal of the door under dynamic conditions;

[0088] It should be noted that Figure 5 shows the calculated value curves and test value curves under different sound insulation amounts, and it can be found that the calculated value curves and the test value curves are highly fitted, and the specific data involved can be referred to the following table:

[0089]

[0090] Form a database containing the deformation amounts and sound insulation amounts of the primary door seal strip and the secondary door seal strip under different cross-sections in a dynamic state.

[0091] Thus, through the steps provided in Example 1 and Example 2, those skilled in the art obtain a database containing the deformation amounts and sound insulation amounts of the primary door seal strip and the secondary door seal strip under different cross-sections in a dynamic state; by means of this database, it is possible to conveniently and quickly select models and guide the design for the dynamic sealing, dynamic deformation, and sound insulation performance of the seal strips during the automobile design and R & D process.

[0092] Example 3

[0093] Example 3 includes all the technical features of Example 1; in addition, Example 3 further defines step 31.

[0094] Specifically, step 31 can be described as:

[0095] After step 3 is completed, use tests to measure the pressure-load curves of the primary door seal strip and the secondary door seal strip obtained in step 3, so as to verify the non-linear finite element models of the primary door seal strip and the secondary door seal strip obtained in step 2.

[0096] For example, the verification process for the non-linear finite element models of the primary door seal strip and the secondary door seal strip can be referred to as follows:

[0097] 1. First, calculate the compression process of the seal strip through numerical calculation, and then obtain the pressure-load curve during the compression process;

[0098] 2. Compare the calculated pressure-load curve with the test results, and observe whether the trends of the two curves are consistent and whether the values of each y-coordinate point satisfy the 10% error range.

[0099] Specifically, as shown in Figure 3 shown, Figure 3 the test result curve and the simulation result curve are respectively shown, and the data offset between the two can be referred to the following table:

[0100]

[0101] (1). If the error between the two is within 10%, the calculation result meets the engineering requirements;

[0102] (2). If the error between the two is greater than 10%, modify the parameters of the simulation calculation model, such as correcting the material parameters, mesh parameters, and boundary conditions, etc., re-calculate and output the results, and cycle and iterate until the engineering error requirements are met and the calculation is terminated.

[0103] Example 4

[0104] Example 4 includes all the technical features of Example 1; in addition, Example 4 is further limited by step 51.

[0105] Specifically, step 51 can be described as:

[0106] After step 5 is completed, based on the boundary conditions of the diffuse sound field obtained in step 4, the static sound insulation curve of the door primary seal and the door secondary seal obtained in step 5 is tested by experiment to verify the acoustic finite element calculation model used in step 5.

[0107] For example, the verification process for the acoustic finite element calculation model can be referred to as follows:

[0108] 1. First, numerically calculate the sound insulation analysis process of the seal, and then obtain the sound insulation curve of the seal itself;

[0109] 2. Then, compare the calculated sound insulation curve of the seal with the experimental results, and observe whether the trends of the two curves are consistent and whether the values of each y - coordinate point meet the 10% error range;

[0110] (1). If the error between the two is within 10%, the calculation result meets the engineering requirements;

[0111] (2). If the error between the two is greater than 10%, modify the parameters of the simulation calculation model, such as correcting material parameters, mesh parameters, and boundary conditions, etc., recalculate and output the results, and iterate until the engineering error requirement is met to terminate the calculation.

[0112] Example 5

[0113] Example 5 includes all the technical features of Example 1; in addition, Example 5 is further limited by step 91.

[0114] Specifically, step 91 can be described as:

[0115] After step 9 is completed, the deformation of the door structure finite element model obtained in step 9 under the action of fluid pressure is tested by experiment to verify the door structure finite element model used in step 7.

[0116] For example, the verification process for the door structure finite element model can be referred to as follows:

[0117] 1. First, numerically calculate the deformation process of the door under the action of external fluid load, and then obtain the deformation of the door;

[0118] 2. Then, compare the calculated door deformation with the test results to observe whether the deformation trends of the two are consistent and whether the deformations at different positions meet the 10% error range.

[0119] (1). If the error between the two is within 10%, the calculation result meets the engineering requirements.

[0120] (2). If the error between the two is greater than 10%, modify the parameters of the simulation calculation model, such as correcting material parameters, mesh parameters, and boundary conditions, etc., recalculate and output the results, and iterate until the engineering error requirement is met to terminate the calculation.

[0121] The present invention provides a method for analyzing the dynamic deformation and sound insulation of a door seal strip. The method for analyzing the dynamic deformation and sound insulation of the door seal strip includes obtaining two-dimensional geometric models of the cross-sections of the first-stage door seal strip and the second-stage door seal strip of the door, establishing a nonlinear finite element model of the first-stage door seal strip and the second-stage door seal strip of the door, calculating the pressure load curves of the first-stage door seal strip and the second-stage door seal strip of the door, establishing a boundary condition of a diffuse sound field, calculating the static sound insulation of the first-stage door seal strip and the second-stage door seal strip of the door, solving to obtain the fluid pressure pulsation load information at different times on the door surface, obtaining the pressure load information of the finite element model of the door structure, setting static calculation and solution parameters for the finite element model of the door structure, calculating and extracting the deformation of the finite element model of the door structure under the action of fluid pressure, calculating the dynamic deformation of the first-stage door seal strip and the second-stage door seal strip of the door, establishing a sound-solid coupling calculation model of the deformed first-stage door seal strip and the second-stage door seal strip of the door, calculating the true sound insulation of the first-stage door seal strip and the second-stage door seal strip of the door after generating dynamic deformation, and other steps.

[0122] The method for analyzing the dynamic deformation and sound insulation of the door seal strip with the above step characteristics has at least the following features:

[0123] (1). The invention proposes a calculation method for quickly predicting the dynamic deformation and sound insulation analysis of a door from the numerical calculation method, which can be used to assist in the dynamic seal design of the door.

[0124] (2). The invention only uses the two-dimensional cross-section model of the seal strip as the input, the processing model is simple, and the calculation efficiency is very high, so it is very convenient to integrate into the industrial design process.

[0125] (3). Through multi-disciplinary and multi-physical field coupling simulation analysis means, calculate the dynamic deformation and sound insulation of the door under high-speed driving conditions, obtain the deformation and sound insulation of the door under the action of internal and external pressure differences. Compared with the static seal, the simulation results are more in line with the actual situation and the calculation accuracy is higher.

[0126] (4) The analysis method introduces a large number of experimental analysis means to verify the simulation analysis model, ensuring the reliability and accuracy of the calculation method, and having good guiding significance for the early NVH design of vehicle seals.

[0127] As described above, only the specific embodiments of the present invention are provided, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claimed rights.

Claims

1. A method for analyzing the dynamic deformation and sound insulation of a car door seal strip, characterized in that, It includes the following steps: Step 1: Obtain the two-dimensional geometric models of the cross-sections of the first-stage door seal strip and the second-stage door seal strip. Step 2: Establish the non-linear finite element models of the first-stage door seal strip and the second-stage door seal strip. Step 3: Based on the non-linear finite element models of the first-stage door seal strip and the second-stage door seal strip obtained in Step 2, calculate the pressure-load curves of the first-stage door seal strip and the second-stage door seal strip. Step 4: Establish the boundary conditions of the diffuse sound field. Step 5: Based on the boundary conditions of the diffuse sound field obtained in Step 4, use the acoustic finite element calculation model to calculate the static sound insulation of the first-stage door seal strip and the second-stage door seal strip. Step 6: Establish the calculation model of the external flow field during vehicle driving; solve to obtain the fluid pressure pulsation load information on the door surface at different times. Step 7: Based on the shape function interpolation algorithm, interpolate the fluid pressure pulsation load information obtained in Step 6 onto the finite element model of the door structure to obtain the pressure load information of the finite element model of the door structure. Step 8: Set the static calculation and solution parameters for the finite element model of the door structure. Step 9: Calculate and extract the deformation of the finite element model of the door structure under the action of the fluid pressure. Step 10: Calculate the dynamic deformations of the first-stage door seal strip and the second-stage door seal strip. Step 11: Based on the dynamic deformations of the first-stage door seal strip and the second-stage door seal strip obtained in Step 10, establish the acoustic-structure coupling calculation models of the deformed first-stage door seal strip and the second-stage door seal strip. Step 12: Calculate the actual sound insulation of the first-stage door seal strip and the second-stage door seal strip after generating dynamic deformations. The boundary conditions of the diffuse sound field established in Step 4 satisfy: ； wherein, Pn(r,t) represents plane waves with different phases. The dynamic deformations of the first-stage door seal strip and the second-stage door seal strip in Step 10 satisfy: The dynamic deformations of the first-stage door seal strip and the second-stage door seal strip = the static deformation under the door closed state - the deformation of the door under the action of the external flow field pressure.

2. The method for analyzing the dynamic deformation and sound insulation quantity of a car door sealing strip according to claim 1, characterized in that, It further includes: Step 13: Statistically analyze the deformations and sound insulation of different cross-sections of the first-stage door seal strip and the second-stage door seal strip under dynamic conditions. Form a database containing the deformations and sound insulation of different cross-sections of the first-stage door seal strip and the second-stage door seal strip under dynamic conditions.

3. The dynamic deformation and sound insulation analysis method of a door seal strip according to claim 1, characterized in that The steps of establishing the non-linear finite element models of the first-stage door seal strip and the second-stage door seal strip in Step 2 can be described as: Obtain the stress-strain curve of the rubber through uniaxial compression and equi-biaxial tension experiments. The stress-strain curve of the rubber was fitted using the Mooney-Rivilin constitutive model to obtain the parameters C 01 and C 10 values; C will be obtained 01 and C 10 The values are used as the material parameters of the non-linear finite element model of the primary door seal and the secondary door seal Apply compression displacements and constraint boundary conditions to the contact areas between the first-stage door seal strip, the second-stage door seal strip and the door and the door frame respectively to simulate the compression effect during the door closing process.

4. A method for analyzing the dynamic deformation and sound insulation of a car door sealing strip according to claim 1, characterized in that It further includes Step 31: After Step 3 is completed, use experiments to test the pressure-load curves of the first-stage door seal strip and the second-stage door seal strip obtained in Step 3 to verify the non-linear finite element models of the first-stage door seal strip and the second-stage door seal strip obtained in Step 2.

5. A method for analyzing the dynamic deformation and sound insulation of a car door sealing strip according to claim 1, characterized in that It further includes Step 51: After step 5 is completed, based on the diffuse sound field boundary conditions obtained in step 4, use experiments to test the static sound insulation curves of the first-stage door seal strip and the second-stage door seal strip obtained in step 5, so as to verify the acoustic finite element calculation model used in step 5.

6. The dynamic deformation and sound insulation analysis method of a door seal strip according to claim 1, characterized in that It also includes step 91: After step 9 is completed, use experiments to test the deformation amount of the door structure finite element model obtained in step 9 under the action of fluid pressure, so as to verify the door structure finite element model used in step 7.

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