CN115879384A - Dynamic deformation and sound insulation amount analysis method for vehicle door sealing strip - Google Patents
Dynamic deformation and sound insulation amount analysis method for vehicle door sealing strip Download PDFInfo
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- CN115879384A CN115879384A CN202111163134.1A CN202111163134A CN115879384A CN 115879384 A CN115879384 A CN 115879384A CN 202111163134 A CN202111163134 A CN 202111163134A CN 115879384 A CN115879384 A CN 115879384A
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Abstract
The invention belongs to the technical field of vibration control engineering, and particularly relates to a method for analyzing dynamic deformation and sound insulation quantity of a vehicle door sealing strip. The method for analyzing the dynamic deformation and the sound insulation quantity of the vehicle door sealing strip can be used for optimizing the structure of the vehicle door sealing strip, and not only can the sound insulation effect of the vehicle door sealing strip be enhanced, so that the purpose of reducing the noise level in a vehicle is achieved, but also the development requirements of cost control and light weight can be met. The method for analyzing the dynamic deformation and the sound insulation amount of the vehicle door sealing strip comprises the steps of obtaining a two-dimensional geometric model of the section of a first sealing strip of the vehicle door and a two-dimensional geometric model of the section of a second sealing strip of the vehicle door, establishing a nonlinear finite element model of the first sealing strip of the vehicle door and the section of the second sealing strip of the vehicle door, calculating a pressure load curve of the first sealing strip of the vehicle door and the section of the second sealing strip of the vehicle door, establishing a boundary condition of a diffusion sound field, calculating the static sound insulation amount of the first sealing strip of the vehicle door and the section of the second sealing strip of the vehicle door, solving to obtain fluid pressure pulsation load information of the surface of the vehicle door at different moments, and the like.
Description
Technical Field
The invention belongs to the technical field of vibration control engineering, and particularly relates to a method for analyzing dynamic deformation and sound insulation quantity of a vehicle door sealing strip.
Background
With the effective control of powertrain noise, tire/road noise and the continuous increase of vehicle speed, wind noise has become one of the main noise sources of current high-speed vehicles; under the condition of higher driving speed, the wind noise energy of the automobile can increase with the power of about 6 times of the driving speed of the automobile; while other noises increase with vehicle speed much lower than wind noise, both aspects result in wind noise being a significant noise source for automobiles. Wind noise affects both the riding comfort of people inside the vehicle and the acoustic environment outside the vehicle. Comprehensive measures are needed to reduce the noise in the vehicle, including reduction of noise sources, improvement of sound insulation performance of a vehicle body structure and the like, and the use of the sealing strip is an important measure for improving the overall sound insulation performance of the vehicle body, so that air sound can be effectively inhibited from entering the vehicle.
The sealing strip has a dynamic sealing effect on the automobile, and main factors influencing dynamic sealing are as follows:
(1) Component rigidity: when the automobile runs at a high speed, negative pressure can occur at a local part of the surface of the automobile body, and a push component (such as a door frame) deforms outwards, so that a gap is formed between the door frame and the automobile body;
(2) Deformation of the sealing member: the pressure difference between the inside and the outside flowing over the surface of the vehicle body causes the deformation of the sealing element to be reduced;
(3) Sealing position: the pressure and flow characteristics of the outside of the automobile body corresponding to different sealing positions are different, areas with large negative pressure and turbulent flow, such as areas close to a rearview mirror, an A column and a B column, and the like, are strictly sealed, and the positions close to the ears of passengers are also strictly controlled due to the short transmission path of wind noise;
(4) Seal shape: the different cross-sectional shapes, thicknesses and contact patterns with the body components of the seal will affect the amount of seal compression and sound insulation to varying degrees.
Notably, to address the above-described wind noise problem, the skilled person has made numerous attempts: for example, application No.: CN201710264545.7, patent title: in a patent document of a method for measuring and optimizing sound insulation of a door weather strip considering the influence of a compression state, a method for measuring and optimizing sound insulation of a door weather strip is described, and the method comprises the following steps: (1) Establishing a finite element simulation model of closing compression of the vehicle door, the sealing strip and the vehicle frame for simulating closing compression; (2) Acquiring the geometric state of the sealing strip after the sealing, closing and compression deformation; (3) Quantifying the compression state of each sealed sound insulation section; (4) Inputting a compression state quantized value of a sealed sound insulation section, and establishing a finite element-infinite element sealed sound insulation model based on a double-plate sound insulation principle; (5) Sound insulation simulation is carried out through a sound insulation model to obtain the sound insulation quantity of the corresponding sealed sound insulation section; (6) Establishing a regression model of the sound insulation quantity of each sealed sound insulation section and the quantization value of the compression state; and (7) optimizing the sealing strip according to the regression model. Compared with the prior art, the invention considers the compression deformation of the closed car door after being closed, so that the measurement result is more practical, and the sound insulation optimization of the car door is better supported.
However, after further research, the inventor finds that the dynamic sealing is a typical multidisciplinary physical field problem due to more factors involved; therefore, it is still necessary for those skilled in the art to continuously optimize the prior art including the above examples so as to provide a more optimized calculation analysis method, thereby providing simulation data support for rapid prediction of dynamic sealing performance of the vehicle door, analysis of influence of various parameters on sound insulation performance, and optimization design of the dynamic sealing system of the vehicle by engineers.
Disclosure of Invention
The invention provides a method for analyzing the dynamic deformation and the sound insulation quantity of a vehicle door sealing strip, which can be used for optimizing the structure of the vehicle door sealing strip, can enhance the sound insulation effect of the vehicle door sealing strip, thereby achieving the purpose of reducing the noise level in a vehicle, can meet the development requirements of cost control and light weight, and has certain practical significance for the development of vehicles and the control of cost.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for analyzing dynamic deformation and sound insulation quantity of a vehicle door sealing strip comprises the following steps:
step 1: acquiring a two-dimensional geometric model of the section of a first sealing strip of the vehicle door and a two-dimensional geometric model of the section of a second sealing strip of the vehicle door;
step 2: establishing a nonlinear finite element model of a first sealing strip of the vehicle door and a second sealing strip of the vehicle door;
and step 3: calculating a pressure load curve of the first door sealing strip and the second door sealing strip based on the nonlinear finite element models of the first door sealing strip and the second door sealing strip obtained in the step 2;
and 4, step 4: establishing boundary conditions of a diffuse sound field;
and 5: based on the boundary condition of the diffused sound field obtained in the step 4, calculating the static sound insulation amount of the first sealing strip and the second sealing strip of the car door by using an acoustic finite element calculation model;
step 6: establishing an external flow field calculation model in the driving process of the automobile; solving to obtain the fluid pressure pulsation load information of the surface of the vehicle door at different moments;
and 7: interpolating the fluid pressure pulsation load information obtained in the step 6 to a vehicle door structure finite element model based on a shape function interpolation algorithm to obtain pressure load information of the vehicle door structure finite element model;
and 8: setting statics calculation and solution parameters for a finite element model of the vehicle door structure;
and step 9: calculating and extracting the deformation of the finite element model of the vehicle door structure under the action of fluid pressure;
step 10: calculating the dynamic deformation of the first sealing strip of the vehicle door and the second sealing strip of the vehicle door;
step 11: establishing an acoustic-solid coupling calculation model of the deformed first door sealing strip and the second door sealing strip based on the dynamic deformation of the first door sealing strip and the second door sealing strip obtained in the step 10;
step 12: and calculating the real sound insulation amount of the first sealing strip of the car door and the second sealing strip of the car door after the dynamic deformation is generated.
Preferably, the method further comprises the following steps:
step 13: counting the deformation and the sound insulation of the first sealing strip and the second sealing strip of the vehicle door under different section dynamic conditions;
and forming a database containing the dynamic lower deformation and the sound insulation of different sections of the first sealing strip and the second sealing strip of the vehicle door.
Preferably, the step of establishing the non-linear finite element model of the first door sealing strip and the second door sealing strip in the step 2 may be described as follows:
obtaining a stress-strain curve of the rubber through uniaxial compression and equal biaxial tension experiments;
fitting the stress-strain curve of the rubber by using a Mooney-Rivilin constitutive model to obtain a parameter C of the Mooney-Rivilin constitutive model fitting curve 01 And C 10 A value;
will obtain C 01 And C 10 The value is used as the first sealing strip of the car door and the second car doorMaterial parameters of the nonlinear finite element model of the sealing strip;
and respectively applying compression displacement and constraint boundary conditions to contact areas of the first door sealing strip, the second door sealing strip, the door and the door frame so as to simulate the compression effect in the closing process of the door.
Preferably, the method further comprises the step 31:
after the step 3 is finished, as shown in fig. 4, the pressure load curves of the first door sealing strip and the second door sealing strip obtained in the step 3 are tested by using a test, so that the check of the nonlinear finite element models of the first door sealing strip and the second door sealing strip obtained in the step 2 is realized.
Preferably, the boundary condition of the diffuse sound field established in step 4 satisfies:
where Pn (r, t) represents plane waves of respective different phases;
preferably, the method further comprises step 51:
and after the step 5 is finished, testing the static sound insulation curves of the first sealing strip and the second sealing strip of the car door obtained in the step 5 by using a test based on the boundary condition of the diffusion sound field obtained in the step 4 so as to check the acoustic finite element calculation model used in the step 5.
Preferably, the method further comprises step 91:
and after the step 9 is finished, testing the deformation of the vehicle door structure finite element model obtained in the step 9 under the action of fluid pressure by using a test so as to check the vehicle door structure finite element model used in the step 7.
Preferably, the dynamic deformation of the first door sealing strip and the second door sealing strip in the step 10 satisfies the following requirements:
the dynamic deformation of the first sealing strip and the second sealing strip of the car door = the static deformation of the car door in the closed state-the deformation of the car door under the action of the pressure of an external flow field
The invention provides a method for analyzing dynamic deformation and sound insulation of a door sealing strip, which comprises the steps of obtaining a two-dimensional geometric model of the section of a first door sealing strip and a two-dimensional geometric model of the section of a second door sealing strip, establishing a nonlinear finite element model of the first door sealing strip and the second door sealing strip, calculating a compression load curve of the first door sealing strip and the second door sealing strip, establishing boundary conditions of a diffusion sound field, calculating static sound insulation of the first door sealing strip and the second door sealing strip, solving to obtain fluid pressure pulsation load information of different moments of a door surface, obtaining pressure load information of a door structure finite element model, setting static calculation and solving parameters for the door structure finite element model, calculating and extracting deformation of the door structure finite element model under the action of fluid pressure, calculating dynamic deformation of the first door sealing strip and the second door sealing strip, establishing an acoustic-solid coupling calculation model of the deformed first door sealing strip and the second door sealing strip, calculating the real sound insulation of the first door sealing strip and the second door sealing strip after dynamic deformation, and the like.
The method for analyzing the dynamic deformation and the sound insulation quantity of the vehicle door sealing strip with the steps and the characteristics at least has the following characteristics:
(1) The invention provides a calculation method for quickly predicting the dynamic deformation of the vehicle door and analyzing the sound insulation based on a numerical calculation method, and the calculation method can be used for assisting in the dynamic sealing design of the vehicle door.
(2) The method only uses the two-dimensional section model of the sealing strip as input, has simple processing model and high calculation efficiency, and is very convenient to be integrated into the industrial design flow.
(3) Calculating the dynamic deformation and the sound insulation amount of the vehicle door in a high-speed running state by a multidisciplinary and multi-physical-field coupling simulation analysis means to obtain the deformation amount and the sound insulation amount of the vehicle door under the action of internal and external pressure difference, wherein the simulation result is more consistent with the reality and has higher calculation precision compared with the static seal;
(4) The analysis method introduces a large number of test analysis means to verify the simulation analysis model, ensures the reliability and accuracy of the calculation method, and has good guiding significance for early-stage NVH design of the vehicle sealing element.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the following drawings:
FIG. 1 is a schematic flow chart of a method for analyzing dynamic deformation and sound insulation of a vehicle door sealing strip according to the present invention;
FIG. 2 is a schematic view of a nonlinear finite element model based on the established first door seal strip and second door seal strip;
FIG. 3 is a schematic view of a data analysis for checking the nonlinear finite element models of the first door weather strip and the second door weather strip shown in FIG. 2;
FIG. 4 is a schematic diagram of simulation of boundary conditions for applying compression displacement and restraint to contact areas of a first door sealing strip, a second door sealing strip, a door and a door frame during simulated door closing;
FIG. 5 is a graph of transmission loss versus test value for a simulated door weatherstrip after compression.
Detailed Description
The invention provides a method for analyzing dynamic deformation and sound insulation quantity of a vehicle door sealing strip, which can be used for optimizing the structure of the vehicle door sealing strip, can enhance the sound insulation effect of the vehicle door sealing strip, so that the aim of reducing the noise level in a vehicle is fulfilled, the development requirements of cost control and light weight can be met, and the method has certain practical significance for development of the vehicle and cost control.
Example one
The invention provides a method for analyzing dynamic deformation and sound insulation quantity of a vehicle door sealing strip, which comprises the following steps of:
step 1: acquiring a two-dimensional geometric model of the section of a first sealing strip of the vehicle door and a two-dimensional geometric model of the section of a second sealing strip of the vehicle door;
step 2: as shown in fig. 2, establishing a nonlinear finite element model of the first sealing strip of the vehicle door and the second sealing strip of the vehicle door;
the point to be supplemented is that the nonlinear finite element model refers to a nonlinear and geometrically large-deformation nonlinear finite element model based on the material nonlinearity of the first door sealing strip and the second door sealing strip.
As a preferred embodiment of the present invention, the step of establishing the nonlinear finite element model of the first door seal strip and the second door seal strip in step 2 may be further described as:
obtaining a stress-strain curve of the rubber through uniaxial compression and equal biaxial tension experiments;
fitting the stress-strain curve of the rubber by using a Mooney-Rivilin constitutive model to obtain a parameter C of the Mooney-Rivilin constitutive model fitting curve 01 And C 10 A value;
will obtain C 01 And C 10 The value is used as the material parameter of the nonlinear finite element model of the first sealing strip and the second sealing strip of the vehicle door;
as shown in fig. 4, compression displacement and constraint boundary conditions were applied to the contact areas of the first door weather strip, the second door weather strip, the door and the door frame, respectively, to simulate the compression effect of the door closing process.
And step 3: calculating a pressure load curve of the first door sealing strip and the second door sealing strip based on the nonlinear finite element models of the first door sealing strip and the second door sealing strip obtained in the step 2;
and 4, step 4: establishing boundary conditions of a diffuse sound field;
as a preferred embodiment of the present invention, the boundary condition of the diffuse sound field established in step 4 satisfies:
where Pn (r, t) represents plane waves of respective different phases.
And 5: based on the boundary condition of the diffusion sound field obtained in the step 4, calculating static sound insulation quantity of the first sealing strip of the vehicle door and the second sealing strip of the vehicle door by using an acoustic finite element calculation model;
it should be added that the static sound insulation amount is a compression amount generated by closing the door in a static state.
Step 6: establishing an external flow field calculation model in the driving process of the automobile; solving to obtain the fluid pressure pulsation load information of the surface of the vehicle door at different moments;
it should be added that the fluid pressure pulsation load information refers to fluid pressure pulsation load generated on the surface of the door due to aerodynamics during the running of the automobile.
And 7: interpolating the fluid pressure pulsation load information obtained in the step 6 to a vehicle door structure finite element model based on a shape function interpolation algorithm to obtain pressure load information of the vehicle door structure finite element model;
and step 8: setting statics calculation and solution parameters for a finite element model of the vehicle door structure;
it should be noted that the process of setting the statics calculation and solution parameters for the finite element model of the vehicle door structure can be specifically described as follows: firstly, applying fluid pulsating pressure load on the surface of the vehicle door; then, constraint boundary conditions are applied to the mounting point of the vehicle door; and finally, selecting a corresponding solver to carry out solving calculation according to actual requirements, and finally outputting a solving result.
And step 9: calculating and extracting the deformation of the finite element model of the vehicle door structure under the action of fluid pressure;
step 10: calculating the dynamic deformation of the first sealing strip of the vehicle door and the second sealing strip of the vehicle door;
as a more preferred embodiment of the present invention, in the step 10, the dynamic deformation amount of the door header weather strip and the door second weather strip satisfies:
the dynamic deformation of the first door seal strip and the second door seal strip is = static deformation in the closed state of the door-door deformation under the action of external flow field pressure.
Step 11: establishing an acoustic-solid coupling calculation model of the deformed first door sealing strip and second door sealing strip based on the dynamic deformation of the first door sealing strip and the second door sealing strip obtained in the step 10;
step 12: and calculating the real sound insulation amount of the first sealing strip of the car door and the second sealing strip of the car door after the dynamic deformation is generated.
Example two
The second embodiment includes all the technical features of the first embodiment; in addition, in the second embodiment, step 13 is further defined.
Specifically, step 13 can be described as: as shown in fig. 5, the deformation and the sound insulation of the first door sealing strip and the second door sealing strip under different section dynamic conditions are counted;
it should be noted that, in fig. 5, the calculated value curve and the test value curve are shown under different sound insulation, and it can be found that both the calculated value curve and the test value curve are highly fitted, and the specific data involved can be referred to the following table:
and forming a database containing dynamic lower deformation and sound insulation of different sections of the first sealing strip and the second sealing strip of the vehicle door.
By the steps provided in the first embodiment and the second embodiment, a person skilled in the art obtains a database containing dynamic lower deformation amounts and sound insulation amounts of different sections of the first sealing strip of the vehicle door and the second sealing strip of the vehicle door; by means of the database, the dynamic sealing, dynamic deformation and sound insulation performance of the sealing strip in the automobile design and research and development processes can be conveniently and quickly selected and designed.
EXAMPLE III
The third embodiment comprises all the technical characteristics of the first embodiment; in addition, the third embodiment further defines step 31.
Specifically, step 31 can be described as:
and (3) after the step (3) is finished, testing the pressure-load curves of the first sealing strip and the second sealing strip of the car door obtained in the step (3) by using a test so as to check the nonlinear finite element models of the first sealing strip and the second sealing strip of the car door obtained in the step (2).
For example, the checking process of the nonlinear finite element models for the first door seal strip and the second door seal strip can be referred to as follows:
1. firstly, calculating the compression process of the sealing strip through numerical values, and then obtaining a compression load curve in the compression process;
2. and comparing the calculated pressure-load curve with the test result, and observing whether the curve trends of the two curves are consistent and whether the numerical value of each y coordinate point meets the error range of 10%.
Specifically, referring to fig. 3, a test result curve and a simulation result curve are respectively shown in fig. 3, and the data offset of the test result curve and the simulation result curve can be referred to the following table:
(1) If the error of the two is within 10 percent, the calculation result meets the engineering requirement;
(2) And if the error between the two parameters is larger than 10%, modifying the parameters of the simulation calculation model, such as correcting material parameters, grid parameters, boundary conditions and the like, recalculating and outputting a result, and repeating iteration until the requirement of engineering errors is met and stopping calculation.
Example four
The fourth embodiment includes all the technical features of the first embodiment; in addition, the fourth embodiment further defines step 51.
Specifically, step 51 can be described as:
and after the step 5 is finished, testing the static sound insulation curves of the first sealing strip and the second sealing strip of the car door obtained in the step 5 by using a test based on the boundary condition of the diffusion sound field obtained in the step 4 so as to check the acoustic finite element calculation model used in the step 5.
For example, the checking process for the acoustic finite element calculation model may refer to the following:
1. firstly, calculating the sound insulation analysis process of the sealing strip through numerical values, and then obtaining a sound insulation curve of the sealing strip;
2. then comparing the calculated sound insulation curve of the sealing strip with the test result, and observing whether the curve trends of the two curves are consistent and whether the numerical value of each y coordinate point meets the error range of 10%;
(1) If the error of the two is within 10%, the calculation result meets the engineering requirement;
(2) And if the error between the two parameters is larger than 10%, modifying the parameters of the simulation calculation model, such as correcting material parameters, grid parameters, boundary conditions and the like, recalculating and outputting a result, and repeating iteration until the requirement of engineering errors is met and stopping calculation.
EXAMPLE five
The fifth embodiment includes all the technical features of the first embodiment; in addition, the fifth embodiment further defines step 91.
Specifically, step 91 may be described as:
and after the step 9 is finished, testing the deformation of the door structure finite element model obtained in the step 9 under the action of fluid pressure by using a test so as to check the door structure finite element model used in the step 7.
For example, a check process for a finite element model of a door structure can be referred to as follows:
1. firstly, calculating the deformation process of the vehicle door under the action of external fluid load through a numerical value, and then obtaining the deformation of the vehicle door;
2. then comparing the calculated deformation of the vehicle door with a test result, and observing whether the deformation trends of the vehicle door and the vehicle door are consistent and whether the deformation of different positions meets a 10% error range;
(1) If the error of the two is within 10 percent, the calculation result meets the engineering requirement;
(2) And if the error between the two parameters is larger than 10%, modifying the parameters of the simulation calculation model, such as correcting material parameters, grid parameters, boundary conditions and the like, recalculating and outputting a result, and repeating iteration until the requirement of engineering errors is met and terminating the calculation.
The invention provides a method for analyzing dynamic deformation and sound insulation of a door sealing strip, which comprises the steps of obtaining a two-dimensional geometric model of the section of a first door sealing strip and a two-dimensional geometric model of the section of a second door sealing strip, establishing a nonlinear finite element model of the first door sealing strip and the second door sealing strip, calculating a compression load curve of the first door sealing strip and the second door sealing strip, establishing boundary conditions of a diffusion sound field, calculating static sound insulation of the first door sealing strip and the second door sealing strip, solving to obtain fluid pressure pulsation load information of different moments of a door surface, obtaining pressure load information of a door structure finite element model, setting static calculation and solving parameters for the door structure finite element model, calculating and extracting deformation of the door structure finite element model under the action of fluid pressure, calculating dynamic deformation of the first door sealing strip and the second door sealing strip, establishing an acoustic-solid coupling calculation model of the deformed first door sealing strip and the second door sealing strip, calculating the real sound insulation of the first door sealing strip and the second door sealing strip after dynamic deformation, and the like.
The method for analyzing the dynamic deformation and the sound insulation quantity of the vehicle door sealing strip with the steps and the characteristics at least has the following characteristics:
(1) The invention provides a calculation method for quickly predicting the dynamic deformation and sound insulation analysis of the vehicle door based on a numerical calculation method, and the calculation method can be used for assisting in the dynamic sealing design of the vehicle door.
(2) The method only uses the two-dimensional section model of the sealing strip as input, has simple processing model and high calculation efficiency, and is very convenient to be integrated into the industrial design process.
(3) Calculating the dynamic deformation and the sound insulation amount of the vehicle door in a high-speed running state by a multidisciplinary and multi-physical-field coupling simulation analysis means to obtain the deformation amount and the sound insulation amount of the vehicle door under the action of internal and external pressure difference, wherein the simulation result is more consistent with the reality and has higher calculation precision compared with the static seal;
(4) The analysis method introduces a large number of test analysis means to verify the simulation analysis model, ensures the reliability and accuracy of the calculation method, and has good guiding significance for early-stage NVH design of the vehicle sealing element.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. A method for analyzing dynamic deformation and sound insulation quantity of a vehicle door sealing strip is characterized by comprising the following steps:
step 1: acquiring a two-dimensional geometric model of the section of a first sealing strip of the vehicle door and a two-dimensional geometric model of the section of a second sealing strip of the vehicle door;
and 2, step: establishing a nonlinear finite element model of a first sealing strip of the vehicle door and a second sealing strip of the vehicle door;
and step 3: calculating a pressure load curve of the first door sealing strip and the second door sealing strip based on the nonlinear finite element models of the first door sealing strip and the second door sealing strip obtained in the step 2;
and 4, step 4: establishing boundary conditions of a diffuse sound field;
and 5: based on the boundary condition of the diffused sound field obtained in the step 4, calculating the static sound insulation amount of the first sealing strip and the second sealing strip of the car door by using an acoustic finite element calculation model;
and 6: establishing an external flow field calculation model in the driving process of the automobile; solving to obtain the fluid pressure pulsation load information of the surface of the vehicle door at different moments;
and 7: interpolating the fluid pressure pulsation load information obtained in the step 6 to a vehicle door structure finite element model based on a shape function interpolation algorithm to obtain pressure load information of the vehicle door structure finite element model;
and 8: setting static calculation and solution parameters for a finite element model of the vehicle door structure;
and step 9: calculating and extracting the deformation of the finite element model of the vehicle door structure under the action of fluid pressure;
step 10: calculating the dynamic deformation of the first sealing strip and the second sealing strip of the vehicle door;
step 11: establishing an acoustic-solid coupling calculation model of the deformed first door sealing strip and second door sealing strip based on the dynamic deformation of the first door sealing strip and the second door sealing strip obtained in the step 10;
step 12: and calculating the real sound insulation amount of the first sealing strip of the car door and the second sealing strip of the car door after the dynamic deformation is generated.
2. The method for analyzing the dynamic deformation and the sound insulation quantity of the vehicle door sealing strip according to claim 1, characterized by further comprising the following steps:
step 13: counting the deformation and the sound insulation of the first sealing strip and the second sealing strip of the vehicle door under different section dynamic conditions;
and forming a database containing the dynamic lower deformation and the sound insulation of different sections of the first sealing strip and the second sealing strip of the vehicle door.
3. The method for analyzing the dynamic deformation and the sound insulation quantity of the door sealing strip according to claim 1, wherein the step of establishing the nonlinear finite element model of the first door sealing strip and the second door sealing strip in the step 2 can be described as follows:
obtaining a stress-strain curve of the rubber through uniaxial compression and equal biaxial tension experiments;
fitting the stress-strain curve of the rubber by using a Mooney-Rivilin constitutive model to obtain a parameter C of the Mooney-Rivilin constitutive model fitting curve 01 And C 10 A value;
will obtain C 01 And C 10 The value is used as the material parameter of the nonlinear finite element model of the first sealing strip and the second sealing strip of the vehicle door;
and respectively applying compression displacement and constraint boundary conditions to contact areas of the first door sealing strip, the second door sealing strip, the door and the door frame so as to simulate the compression effect in the closing process of the door.
4. The method for analyzing the dynamic deformation and the sound insulation quantity of the vehicle door sealing strip according to claim 1, characterized by further comprising the step 31 of:
and (3) after the step (3) is finished, testing the pressure-load curves of the first sealing strip and the second sealing strip of the car door obtained in the step (3) by using a test so as to check the nonlinear finite element models of the first sealing strip and the second sealing strip of the car door obtained in the step (2).
5. The method for analyzing the dynamic deformation and the sound insulation quantity of the vehicle door sealing strip according to claim 1, wherein the boundary condition of the diffusion sound field established in the step 4 meets the following requirements:
where Pn (r, t) represents plane waves of respective different phases.
6. The method for analyzing the dynamic deformation and the sound insulation quantity of the vehicle door sealing strip according to claim 1, characterized by further comprising the step 51 of:
and after the step 5 is finished, testing the static sound insulation curves of the first sealing strip and the second sealing strip of the car door obtained in the step 5 by using a test based on the boundary condition of the diffusion sound field obtained in the step 4 so as to check the acoustic finite element calculation model used in the step 5.
7. The method for analyzing the dynamic deformation and the sound insulation quantity of the vehicle door sealing strip according to claim 1, characterized by further comprising the step 91 of:
and after the step 9 is finished, testing the deformation of the vehicle door structure finite element model obtained in the step 9 under the action of fluid pressure by using a test so as to check the vehicle door structure finite element model used in the step 7.
8. The method for analyzing the dynamic deformation and the sound insulation quantity of the vehicle door sealing strip according to claim 1, wherein the dynamic deformation quantities of the vehicle door head sealing strip and the vehicle door second sealing strip in the step 10 meet the following requirements:
the dynamic deformation of the first door seal strip and the second door seal strip is = static deformation in the closed state of the door-door deformation under the action of external flow field pressure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111163134.1A CN115879384A (en) | 2021-09-30 | 2021-09-30 | Dynamic deformation and sound insulation amount analysis method for vehicle door sealing strip |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111163134.1A CN115879384A (en) | 2021-09-30 | 2021-09-30 | Dynamic deformation and sound insulation amount analysis method for vehicle door sealing strip |
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| CN115879384A true CN115879384A (en) | 2023-03-31 |
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2021
- 2021-09-30 CN CN202111163134.1A patent/CN115879384A/en active Pending
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