In-vehicle vocal cavity modeling method and system, electronic equipment and storage medium

Abstract

The invention discloses an in-vehicle vocal cavity modeling method and system, electronic equipment and a storage medium, and the method comprises the steps: carrying out the partitioning of an in-vehicle region, and obtaining different vocal cavity partitioning regions; establishing a vocal cavity grid model according to the boundaries of different vocal cavity block areas; a first acoustic material attribute is given to at least one of the passenger compartment sound cavity, the trunk sound cavity, the vehicle door sound cavity and the rear side wall sound cavity, and a second acoustic material attribute is given to at least one of the seat sound cavity, the central control instrument panel sound cavity and the hat and coat stand sound cavity; according to the first acoustic material attribute of at least one of the passenger compartment acoustic cavity, the trunk acoustic cavity, the vehicle door acoustic cavity and the rear side wall acoustic cavity and the second acoustic material attribute of at least one of the seat acoustic cavity, the central control instrument panel acoustic cavity and the hat and coat stand acoustic cavity, acoustic cavity modal analysis is carried out on the acoustic cavity grid model, and the frequency of the acoustic cavity modal is obtained. The method can effectively improve the precision of the vocal cavity model, so that the reliability of simulation analysis and optimization of the low-frequency noise of the vehicle body can be improved.

Description

Technical Field

[0001] The present invention relates to the field of automobile NVH technology, and in particular to a method for modeling an in-vehicle acoustic cavity, a system for modeling an in-vehicle acoustic cavity, a computer-readable storage medium and an electronic device. Background Art

[0002] The car body is a typical acoustic cavity-structure coupling system. The low-frequency structural noise inside the car is mainly transmitted to the body panels through the transmission system and suspension by external excitations such as the engine and road surface, which excites the vibration of the panels, causing changes in the volume of the acoustic cavity inside the car, and causing the sound pressure fluctuations to generate noise. At the same time, the sound pressure fluctuations in the acoustic cavity act on the body and also excite the vibration of the panels. Therefore, the accuracy of the finite element modeling of the acoustic cavity inside the car is crucial to the prediction and control of the low-frequency noise inside the car.

[0003] In the related art, there are many simplifications in the finite element model of the vehicle body for low-frequency noise analysis in the vehicle, such as soft and hard interior parts, seats, etc. At the same time, there are many holes and gaps in the sheet metal and interior decoration of the vehicle to connect different cavities. The finite element model of the vehicle sound cavity cannot be completely modeled according to the actual vehicle sound cavity boundary. Therefore, the modal frequency and vibration shape of the vehicle sound cavity model have certain errors compared with the actual situation, which affects the accuracy of the simulation analysis of low-frequency noise in the vehicle. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art to at least a certain extent. To this end, the first purpose of the present invention is to propose a method for modeling the in-vehicle acoustic cavity, taking the acoustic material properties of the seat acoustic cavity, the central control instrument panel acoustic cavity and the coat rack acoustic cavity as variables, and optimizing the variable parameters to effectively improve the accuracy of the acoustic cavity model, thereby improving the reliability of the vehicle body low-frequency noise simulation analysis and optimization, and providing a strong guarantee for the development of the vehicle body NVH low-frequency performance.

[0005] The second object of the present invention is to provide a vehicle interior acoustic cavity modeling system.

[0006] A third object of the present invention is to provide a computer-readable storage medium.

[0007] A fourth objective of the present invention is to provide an electronic device.

[0008] To achieve the above-mentioned purpose, a first aspect of the present invention proposes a method for modeling an in-vehicle acoustic cavity, the method comprising: dividing the in-vehicle area into blocks to obtain different acoustic cavity block areas, wherein the acoustic cavity block areas include a plurality of passenger compartment acoustic cavity, luggage compartment acoustic cavity, door acoustic cavity, rear side wall acoustic cavity, seat acoustic cavity, central control instrument panel acoustic cavity and coat rack acoustic cavity; establishing an acoustic cavity mesh model according to the boundaries of different acoustic cavity block areas; assigning a first acoustic material property to at least one of the passenger compartment acoustic cavity, luggage compartment acoustic cavity, door acoustic cavity and rear side wall acoustic cavity, and assigning a second acoustic material property to at least one of the seat acoustic cavity, central control instrument panel acoustic cavity and coat rack acoustic cavity; performing acoustic cavity modal analysis on the acoustic cavity mesh model according to the first acoustic material property of at least one of the passenger compartment acoustic cavity, luggage compartment acoustic cavity, door acoustic cavity and rear side wall acoustic cavity, and the second acoustic material property of at least one of the seat acoustic cavity, central control instrument panel acoustic cavity and coat rack acoustic cavity to obtain the frequency of the acoustic cavity mode.

[0009] According to the vehicle interior acoustic cavity modeling method of the embodiment of the present invention, the vehicle interior area is first divided into blocks to obtain different acoustic cavity block areas, and then the acoustic cavity mesh model is established according to the boundaries of the different acoustic cavity block areas, and then the first acoustic material attribute is assigned to at least one of the passenger compartment acoustic cavity, the luggage compartment acoustic cavity, the door acoustic cavity and the rear side wall acoustic cavity, and the second acoustic material attribute is assigned to at least one of the seat acoustic cavity, the central control instrument panel acoustic cavity and the coat rack acoustic cavity, and finally, according to the first acoustic material attribute of at least one of the passenger compartment acoustic cavity, the luggage compartment acoustic cavity, the door acoustic cavity and the rear side wall acoustic cavity, and the second acoustic material attribute of at least one of the seat acoustic cavity, the central control instrument panel acoustic cavity and the coat rack acoustic cavity, the acoustic cavity mesh model is subjected to acoustic cavity modal analysis to obtain the frequency of the acoustic cavity mode. Therefore, the method uses the acoustic material attributes of the seat acoustic cavity, the central control instrument panel acoustic cavity and the coat rack acoustic cavity as variables, and can effectively improve the accuracy of the acoustic cavity model by optimizing the variable parameters, thereby improving the reliability of the vehicle body low-frequency noise simulation analysis and optimization, and providing a strong guarantee for the vehicle body NVH low-frequency performance development.

[0010] In addition, the vehicle interior acoustic cavity modeling method according to the above embodiment of the present invention may also have the following additional technical features:

[0011] According to one embodiment of the present invention, the interior area of ​​the vehicle is divided into blocks to obtain different sound cavity block areas, including: an area surrounded by multiple ones of the front windshield, the top cover sheet metal, the sunroof, the rear windshield, the coat rack trim, the front floor sheet metal, the instrument panel surface, the center console surface, the front and rear seat surfaces, the front and rear door inner panel sheet metal and the door glass as the passenger compartment sound cavity; an area surrounded by the front and rear seat surfaces and the floor sheet metal as the seat sound cavity; an area surrounded by the instrument panel surface, the center console surface, the front panel sheet metal and the floor The area surrounded by multiple sheet metals is used as the central control instrument panel sound cavity; the area surrounded by multiple sheet metals of the coat rack, the rear tailgate inner panel, the spare tire well sheet metal, the rear side panel inner panel and the rear seat surface is used as the trunk sound cavity; the area surrounded by the front and rear door inner panel and outer panel is used as the door sound cavity; the area surrounded by the rear side panel inner panel and outer panel is used as the rear side panel sound cavity; the area surrounded by the coat rack sheet metal and the coat rack trim is used as the coat rack sound cavity.

[0012] According to an embodiment of the present invention, a sound cavity grid model is established according to boundaries of different sound cavity block areas, including: separating the different sound cavity block areas according to connection relationships between the different sound cavity block areas, or coupling them in a common node manner.

[0013] According to one embodiment of the present invention, the different sound cavity block areas are separated or coupled in a common node manner according to the connection relationship between them, including: the passenger compartment sound cavity and the seat sound cavity are coupled in a common node manner on the seat surface; the passenger compartment sound cavity and the central control instrument panel sound cavity are coupled in a common node manner on the lower surface of the instrument panel; the passenger compartment sound cavity and the door sound cavity are coupled in a common node manner at the position of the sheet metal hole in the door inner panel; the passenger compartment sound cavity and the clothes rack sound cavity are coupled in a common node manner on the surface of the clothes rack trim; the luggage compartment sound cavity and the clothes rack sound cavity are coupled in a common node manner at the position of the sheet metal hole in the clothes rack; the luggage compartment sound cavity and the rear side wall cavity are coupled in a common node manner at the position of the sheet metal hole in the rear side wall inner panel.

[0014] According to an embodiment of the present invention, the first acoustic material property is the same acoustic material property as air, and the acoustic material property includes: at least one of density, sound velocity, and bulk modulus.

[0015] According to one embodiment of the present invention, the method further includes: when the result determined by comparing the frequency of the acoustic cavity mode with the reference acoustic cavity mode frequency is unreasonable, adjusting the second acoustic material property of at least one of the seat acoustic cavity, the center console instrument panel acoustic cavity and the coat rack acoustic cavity; performing acoustic cavity modal analysis based on the adjusted second acoustic material property of at least one of the seat acoustic cavity, the center console instrument panel acoustic cavity and the coat rack sound cavity, and the first acoustic material property of at least one of the passenger compartment sound cavity, the luggage compartment sound cavity, the door sound cavity and the rear side panel sound cavity.

[0016] According to one embodiment of the present invention, determining that a result is unreasonable based on the frequency of the acoustic cavity mode and the reference acoustic cavity mode frequency includes: determining that a result is unreasonable when the absolute value of the difference between the frequency of the acoustic cavity mode and the reference acoustic cavity mode frequency is greater than a preset threshold.

[0017] To achieve the above-mentioned purpose, the second aspect of the embodiment of the present invention proposes an in-vehicle acoustic cavity modeling system, including a memory, a processor, and an in-vehicle acoustic cavity modeling program stored in the memory and executable on the processor, and when the processor executes the in-vehicle acoustic cavity modeling program, the above-mentioned in-vehicle acoustic cavity modeling method is implemented.

[0018] The in-vehicle acoustic cavity modeling system according to an embodiment of the present invention can effectively improve the accuracy of the acoustic cavity model by executing the above-mentioned in-vehicle acoustic cavity modeling method, thereby improving the reliability of vehicle body low-frequency noise simulation analysis and optimization, and providing a strong guarantee for the development of vehicle body NVH low-frequency performance.

[0019] To achieve the above objectives, a third aspect of the present invention proposes a computer-readable storage medium on which a vehicle interior acoustic cavity modeling program is stored. When the vehicle interior acoustic cavity modeling program is executed by a processor, the above-mentioned vehicle interior acoustic cavity modeling method is implemented.

[0020] According to the computer-readable storage medium of an embodiment of the present invention, by executing the above-mentioned in-vehicle acoustic cavity modeling method, the accuracy of the acoustic cavity model can be effectively improved, thereby improving the reliability of vehicle body low-frequency noise simulation analysis and optimization, and providing a strong guarantee for the development of vehicle body NVH low-frequency performance.

[0021] To achieve the above-mentioned purpose, an embodiment of the fourth aspect of the present invention proposes an electronic device, including a memory, a processor, and an in-vehicle acoustic cavity modeling program stored in the memory and executable on the processor, wherein when the processor executes the in-vehicle acoustic cavity modeling program, the above-mentioned in-vehicle acoustic cavity modeling method is implemented.

[0022] The electronic device according to the embodiment of the present invention can effectively improve the accuracy of the acoustic cavity model by executing the above-mentioned in-vehicle acoustic cavity modeling method, thereby improving the reliability of vehicle body low-frequency noise simulation analysis and optimization, and providing a strong guarantee for the development of vehicle body NVH low-frequency performance.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a flow chart of a method for modeling a vehicle interior acoustic cavity according to an embodiment of the present invention;

[0025] Figure 2 A block diagram of a vehicle interior acoustic cavity modeling system according to an embodiment of the present invention;

[0026] Figure 3 FIG. 4 is a block diagram of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0028] The following describes the in-vehicle acoustic cavity modeling method, in-vehicle acoustic cavity modeling system, computer-readable storage medium, and electronic device proposed in embodiments of the present invention with reference to the accompanying drawings.

[0029] Figure 1 The figure is a flow chart of a method for modeling a vehicle interior acoustic cavity according to an embodiment of the present invention.

[0030] like Figure 1 As shown, the vehicle interior acoustic cavity modeling method according to the embodiment of the present invention may include the following steps:

[0031] S1, dividing the interior area of ​​the vehicle into blocks to obtain different sound cavity block areas, the sound cavity block areas including multiple of the passenger compartment sound cavity, luggage compartment sound cavity, door sound cavity, rear side wall sound cavity, seat sound cavity, central control instrument panel sound cavity and coat rack sound cavity.

[0032] S2, establishing a vocal cavity grid model according to the boundaries of different vocal cavity block areas.

[0033] S3, assigning a first acoustic material property to at least one of the passenger compartment sound cavity, the trunk sound cavity, the door sound cavity and the rear side wall sound cavity, and assigning a second acoustic material property to at least one of the seat sound cavity, the central control instrument panel sound cavity and the coat rack sound cavity. The first acoustic material property is the same as the acoustic material property of air, and the second acoustic material property may be an initial value or an empirical value.

[0034] S4, performing acoustic cavity modal analysis on the acoustic cavity mesh model according to the first acoustic material properties of at least one of the passenger compartment acoustic cavity, the trunk acoustic cavity, the door acoustic cavity and the rear side panel acoustic cavity, and the second acoustic material properties of at least one of the seat acoustic cavity, the center console acoustic cavity and the clothes rack acoustic cavity, to obtain the frequency of the acoustic cavity mode.

[0035] Specifically, first, the car interior acoustic cavity model is divided into blocks according to the regional position, and the passenger compartment, luggage compartment, door, rear side wall, seat, central control instrument panel and coat rack are identified and divided. Each area is regarded as an independent acoustic cavity block, so that the car interior acoustic cavity is divided into the passenger compartment acoustic cavity, seat acoustic cavity, central control instrument panel acoustic cavity, luggage compartment acoustic cavity, door acoustic cavity, rear side wall acoustic cavity and coat rack acoustic cavity, and the interior space is divided into different acoustic regions, so as to more accurately analyze the propagation and distribution of sound in the car. Then, based on the boundary conditions of the block area, the acoustic cavity grid model is established according to the boundaries of different acoustic cavity blocks to represent the propagation path and mutual influence of sound waves between different acoustic cavity blocks. The same acoustic material properties (first acoustic material properties) are given to at least one of the passenger compartment acoustic cavity, luggage compartment acoustic cavity, door acoustic cavity and rear side wall acoustic cavity, and the second acoustic material properties are given to at least one of the seat acoustic cavity, central control instrument panel acoustic cavity and coat rack acoustic cavity, and the acoustic cavity modal analysis is performed. It should be understood that the acoustic cavities of seats, central control panel, and coat rack are not entirely air. For example, the seats are filled with sponges, and the central control panel contains air conditioning boxes, electrical components, etc. Therefore, the acoustic material properties of the seat acoustic cavity, central control panel acoustic cavity, etc. in the acoustic cavity model need to be specially set. These parameters have a great influence on the modal frequency and vibration shape of the acoustic cavity model. Therefore, the accuracy of the acoustic cavity model can be improved by assigning corresponding acoustic material properties according to different acoustic cavities. Finally, based on the modal test results of the acoustic cavity of the same type of vehicle model or the experience database, judge whether the acoustic cavity modal analysis results are reasonable. If not, use the parameter optimization in the commercial software Nastran combined with the modal tracking technology to optimize the material property parameters of the seat acoustic cavity, central control panel acoustic cavity, and coat rack acoustic cavity to ensure that the frequency and vibration shape of the acoustic cavity mode are correct and reasonable.

[0036] Since there are certain differences between the boundary of the acoustic cavity model and the actual situation, the accuracy of the acoustic cavity model is bound to be insufficient. After testing and simulation benchmarking of multiple vehicles, the acoustic material attribute parameters of the seat acoustic cavity, the central control instrument panel acoustic cavity and the coat rack acoustic cavity have a great influence on the frequency and vibration mode of the acoustic cavity mode in the car. There are differences in the foam material of the seats of different models, the shape and volume of electrical appliances such as the air conditioning box in the central control instrument panel, etc., so the acoustic cavity models of different models cannot simply use a set of material attribute parameters. Therefore, after the acoustic cavity model is built, it is necessary to optimize and debug the acoustic material attribute parameters of the seat acoustic cavity, the central control instrument panel acoustic cavity and the coat rack trim acoustic cavity according to the acoustic cavity modal test results of the same type of vehicle or the experience database to ensure that the frequency and vibration mode of the acoustic cavity mode are correct and reasonable.

[0037] According to one embodiment of the present invention, the interior area of ​​the vehicle is divided into blocks to obtain different sound cavity block areas, including: an area surrounded by multiple ones of the front windshield, top cover sheet metal, sunroof, rear windshield, coat rack trim, front floor sheet metal, instrument panel surface, center console surface, front and rear seat surfaces, front and rear door inner panel sheet metal and door glass as the passenger compartment sound cavity; an area surrounded by the front and rear seat surfaces and floor sheet metal as the seat sound cavity; an area surrounded by the instrument panel surface, center console surface, front panel sheet metal and the floor sheet metal as the center console sound cavity; the area surrounded by the clothes rack sheet metal, the rear tailgate inner panel sheet metal, the spare tire pool sheet metal, the rear side panel inner panel sheet metal and the rear seat surface is used as the trunk sound cavity; the area surrounded by the front and rear door inner panel sheet metal and the outer panel sheet metal is used as the door sound cavity; the area surrounded by the rear side panel inner panel sheet metal and the outer panel sheet metal is used as the rear side panel sound cavity; the area surrounded by the clothes rack sheet metal and the clothes rack trim is used as the clothes rack sound cavity.

[0038] Specifically, the acoustic cavity grid models are established according to the boundaries of different acoustic cavity blocks. The passenger compartment acoustic cavity can be used to simulate the sound propagation and resonance characteristics in the passenger compartment; the seat acoustic cavity can be used to analyze the absorption and propagation characteristics of the seat area; the central control instrument panel acoustic cavity can be used to simulate the reflection and absorption characteristics of the central control instrument panel area; the trunk acoustic cavity can be used to analyze the sound propagation characteristics of the trunk area, and how to reduce noise through design; the door acoustic cavity can be used to simulate the sound propagation and isolation characteristics of the door area; the rear side acoustic cavity can be used to analyze the sound propagation characteristics of the rear side area, and how to reduce noise through design; the coat rack acoustic cavity can be used to simulate the sound propagation characteristics of the coat rack area, and how to improve sound isolation through design. Therefore, by dividing the interior space into different acoustic cavity block areas, the acoustic characteristics of each area can be analyzed more accurately, including sound absorption, reflection and resonance; after understanding the acoustic characteristics of different areas, acoustic materials and structures can be designed in a targeted manner to improve the NVH performance in the car; through acoustic cavity modeling, the sound field distribution in the car can be predicted and controlled, noise and vibration can be reduced, and ride comfort can be improved. Furthermore, the method of the present invention improves the accuracy of the acoustic cavity model based on the sheet metal surface of the vehicle body, does not require changing the existing low-frequency noise analysis vehicle body modeling method, and is more in line with actual project development conditions.

[0039] According to an embodiment of the present invention, a sound cavity grid model is established according to boundaries of different sound cavity block areas, including: separating different sound cavity block areas according to connection relationships between them, or coupling them in a common node manner.

[0040] Specifically, if there is no direct acoustic connection between two cavity blocks, or the connection is very weak, they can be considered acoustically separated. In the cavity mesh model, this means that the two regions will be treated as independent nodes and the interaction between them can be ignored. If there is a significant acoustic connection between two cavity blocks, they acoustically influence each other. In the cavity mesh model, these regions are coupled together through common nodes (i.e., shared boundaries or connection points) to simulate the sound wave transmission and energy exchange between them.

[0041] According to one embodiment of the present invention, different sound cavity block areas are separated or coupled in a common node manner according to the connection relationship between them, including: the passenger compartment sound cavity and the seat sound cavity are coupled in a common node manner on the seat surface; the passenger compartment sound cavity and the central control instrument panel sound cavity are coupled in a common node manner on the lower surface of the instrument panel; the passenger compartment sound cavity and the door sound cavity are coupled in a common node manner at the position of the sheet metal hole in the door inner panel; the passenger compartment sound cavity and the coat rack sound cavity are coupled in a common node manner on the surface of the coat rack trim; the luggage compartment sound cavity and the coat rack sound cavity are coupled in a common node manner at the position of the sheet metal hole in the coat rack; the luggage compartment sound cavity and the rear side wall cavity are coupled in a common node manner at the position of the sheet metal hole in the rear side wall inner panel.

[0042] Specifically, the passenger compartment acoustic cavity is coupled to the seat acoustic cavity at a common node where the seat surface contacts, meaning that the seat surface acts as a connection point, allowing sound waves to pass from one acoustic cavity to the other. The passenger compartment acoustic cavity is coupled to the center console instrument panel acoustic cavity at a hole in the door inner panel sheet metal, which acts as a common node, allowing sound waves to propagate between the two areas. The passenger compartment acoustic cavity is coupled to the door acoustic cavity at a common node at the hole in the door inner panel sheet metal, with the hole acting as a connection point, allowing sound waves to propagate between the passenger compartment and door acoustic cavities. The passenger compartment acoustic cavity is coupled to the coat rack acoustic cavity at a hole in the coat rack trim surface, with the trim surface acting as a common node, allowing sound waves to propagate between the two areas. The trunk acoustic cavity is coupled to the coat rack acoustic cavity at a hole in the coat rack sheet metal, with the hole acting as a common node, allowing sound waves to propagate between the trunk and coat rack acoustic cavities. The trunk sound cavity is coupled with the rear side wall sound cavity at the hole position of the rear side wall inner panel sheet metal. The hole acts as a common node, allowing sound waves to be transmitted between the two areas. Therefore, through common node coupling, sound waves can be transmitted between different sound cavity block areas, affecting the sound field distribution in the entire car; the coupling point, as an interface for acoustic energy exchange, can affect the reflection, absorption and resonance characteristics of sound waves; understanding the location and characteristics of the coupling point helps to optimize the NVH performance of the car, and reduce noise transmission through design measures such as adding sound-absorbing materials or adjusting the structure; in the sound cavity mesh model, these coupling points can be used as key parameters for simulation to help engineers more accurately predict the acoustic behavior in the car.

[0043] According to an embodiment of the present invention, the first acoustic material property is the same acoustic material property as air, and the acoustic material property includes: at least one of density, sound velocity, and bulk modulus.

[0044] It is important to understand that density is the mass density of a material, i.e., the mass per unit volume, which affects the energy distribution of sound waves propagating in a medium. The speed of sound is the speed at which sound waves propagate in a medium, which determines the time and wavelength of sound waves propagating in a specific medium. The bulk modulus is the ability of a material to return to its original shape under force, and is an indicator of the material's stiffness, which affects the compression and recovery characteristics of sound waves propagating in a material.

[0045] Specifically, when the first acoustic material property is assigned the same value as air, it means that these acoustic cavity block areas behave acoustically like air, with lower acoustic impedance and loss factor, and sound waves can propagate relatively freely in these areas without significant energy attenuation. It should be understood that in the modeling of the in-vehicle acoustic cavity, setting the acoustic material properties of certain areas to the same as air can help simplify the model while maintaining an accurate description of the main acoustic phenomena. For example, the passenger compartment acoustic cavity may be assigned the same acoustic properties as air because it is the main passenger space and its acoustic characteristics have the greatest impact on the passengers' auditory experience. Other areas, such as the seat acoustic cavity or the center console instrument panel acoustic cavity, may be assigned different acoustic material properties to simulate their different effects on sound absorption, reflection, and propagation.

[0046] According to one embodiment of the present invention, the above-mentioned method also includes: when the result determined by the frequency of the acoustic cavity mode and the reference acoustic cavity modal frequency is unreasonable, adjusting the second acoustic material property of at least one of the seat acoustic cavity, the center console instrument panel sound cavity and the coat rack sound cavity; performing acoustic cavity modal analysis based on the adjusted second acoustic material property of at least one of the seat acoustic cavity, the center console instrument panel sound cavity and the coat rack sound cavity, and the first acoustic material property of at least one of the passenger compartment sound cavity, the luggage compartment sound cavity, the door sound cavity and the rear side panel sound cavity.

[0047] Specifically, after obtaining the frequency of the acoustic cavity mode, the frequency of the acoustic cavity mode is compared with the reference acoustic cavity mode frequency. If the result is unreasonable, that is, the current mode frequency is greatly different from the reference mode frequency, it is necessary to adjust the second acoustic material property of at least one of the seat acoustic cavity, the central control instrument panel acoustic cavity and the coat rack acoustic cavity, such as changing the density or adjusting the sound speed. After adjusting the second acoustic material property, it is necessary to re-analyze the acoustic cavity mode. This analysis is based on the adjusted second acoustic material property, while considering the first acoustic material property of at least one of the passenger compartment acoustic cavity, the luggage compartment acoustic cavity, the door acoustic cavity and the rear side wall acoustic cavity to obtain the frequency of the adjusted acoustic cavity mode, and then compare the frequency of the adjusted acoustic cavity mode with the reference acoustic cavity mode frequency. It is iterated until the comparison result of the obtained acoustic cavity mode frequency with the reference acoustic cavity mode frequency is reasonable, and the corresponding acoustic cavity mode frequency meets the requirements. It should be understood that acoustic cavity mode analysis and material property adjustment is usually an iterative process, and multiple adjustments and analyses may be required until satisfactory acoustic performance is achieved. In this way, the acoustic environment inside the vehicle can be optimized, the reasonable distribution of the acoustic cavity modal frequency can be ensured, and noise enhancement or sound quality degradation caused by acoustic cavity resonance can be avoided. Better acoustic performance can be expected, such as reducing the noise level inside the vehicle, improving sound clarity, or enhancing overall ride comfort.

[0048] According to an embodiment of the present invention, determining that a result is unreasonable based on the frequency of the acoustic cavity mode and the reference acoustic cavity mode frequency includes: determining that the result is unreasonable when the absolute value of the difference between the frequency of the acoustic cavity mode and the reference acoustic cavity mode frequency is greater than a preset threshold. The preset threshold can be calibrated according to actual conditions.

[0049] Specifically, after obtaining the frequency of the acoustic cavity mode, the frequency of the acoustic cavity mode is subtracted from the reference acoustic cavity mode frequency, and the absolute value of the difference between the two is compared with a preset threshold. When the absolute value is greater than the preset threshold, it is determined that the result is unreasonable and it is necessary to adjust the second acoustic material properties of the seat acoustic cavity, the central control instrument panel acoustic cavity and the clothes rack acoustic cavity; when the absolute value is less than or equal to the preset threshold, it is determined that the result is reasonable and the corresponding frequency of the acoustic cavity mode meets the requirements.

[0050] In summary, according to the in-vehicle acoustic cavity modeling method of the embodiment of the present invention, the in-vehicle area is first divided into blocks to obtain different acoustic cavity block areas, and then the acoustic cavity mesh model is established according to the boundaries of the different acoustic cavity block areas, and then the first acoustic material attribute is assigned to at least one of the passenger compartment acoustic cavity, the luggage compartment acoustic cavity, the door acoustic cavity and the rear side surround acoustic cavity, and the second acoustic material attribute is assigned to at least one of the seat acoustic cavity, the central control instrument panel acoustic cavity and the coat rack acoustic cavity, and finally, according to the first acoustic material attribute of at least one of the passenger compartment acoustic cavity, the luggage compartment acoustic cavity, the door acoustic cavity and the rear side surround acoustic cavity, and the second acoustic material attribute of at least one of the seat acoustic cavity, the central control instrument panel acoustic cavity and the coat rack acoustic cavity, the acoustic cavity mesh model is subjected to acoustic cavity modal analysis to obtain the frequency of the acoustic cavity mode. Therefore, the method uses the acoustic material attributes of the seat acoustic cavity, the central control instrument panel acoustic cavity and the coat rack acoustic cavity as variables, and can effectively improve the accuracy of the acoustic cavity model by optimizing the variable parameters, thereby improving the reliability of the vehicle body low-frequency noise simulation analysis and optimization, and providing a strong guarantee for the development of vehicle body NVH low-frequency performance.

[0051] Corresponding to the above-mentioned embodiment, the present invention also proposes a vehicle interior acoustic cavity modeling system.

[0052] Figure 2 FIG. 4 is a block diagram of a system for modeling an acoustic cavity in a vehicle according to an embodiment of the present invention.

[0053] like Figure 2 As shown, the in-vehicle acoustic cavity modeling system 100 of an embodiment of the present invention includes a memory 110, a processor 120, and an in-vehicle acoustic cavity modeling program stored in the memory 110 and executable on the processor 120. When the processor 120 executes the in-vehicle acoustic cavity modeling program, the above-mentioned in-vehicle acoustic cavity modeling method is implemented.

[0054] The in-vehicle acoustic cavity modeling system according to an embodiment of the present invention can effectively improve the accuracy of the acoustic cavity model by executing the above-mentioned in-vehicle acoustic cavity modeling method, thereby improving the reliability of vehicle body low-frequency noise simulation analysis and optimization, and providing a strong guarantee for the development of vehicle body NVH low-frequency performance.

[0055] Corresponding to the above embodiment, the present invention also proposes a computer-readable storage medium.

[0056] The computer-readable storage medium of the embodiment of the present invention stores a vehicle interior acoustic cavity modeling program, and the vehicle interior acoustic cavity modeling program implements the above-mentioned vehicle interior acoustic cavity modeling method when executed by a processor.

[0057] According to the computer-readable storage medium of an embodiment of the present invention, by executing the above-mentioned in-vehicle acoustic cavity modeling method, the accuracy of the acoustic cavity model can be effectively improved, thereby improving the reliability of vehicle body low-frequency noise simulation analysis and optimization, and providing a strong guarantee for the development of vehicle body NVH low-frequency performance.

[0058] Corresponding to the above embodiment, the present invention further provides an electronic device.

[0059] Figure 3 FIG. 4 is a block diagram of an electronic device according to an embodiment of the present invention.

[0060] like Figure 3 As shown, the electronic device 200 of an embodiment of the present invention includes a memory 210, a processor 220, and an in-vehicle acoustic cavity modeling program stored in the memory 210 and executable on the processor 220. When the processor 220 executes the in-vehicle acoustic cavity modeling program, the above-mentioned in-vehicle acoustic cavity modeling method is implemented.

[0061] The electronic device according to the embodiment of the present invention can effectively improve the accuracy of the acoustic cavity model by executing the above-mentioned in-vehicle acoustic cavity modeling method, thereby improving the reliability of vehicle body low-frequency noise simulation analysis and optimization, and providing a strong guarantee for the development of vehicle body NVH low-frequency performance.

[0062] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0063] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0064] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0065] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0066] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for modeling a vehicle interior acoustic cavity, characterized in that: The method comprises: Divide the vehicle interior area into blocks to obtain different acoustic cavity block areas, wherein the acoustic cavity block areas include a plurality of passenger compartment acoustic cavity, luggage compartment acoustic cavity, door acoustic cavity, rear side wall acoustic cavity, seat acoustic cavity, central control instrument panel acoustic cavity and coat rack acoustic cavity; Establish a vocal cavity grid model according to the boundaries of different vocal cavity block areas; Assigning a first acoustic material property to at least one of the passenger compartment sound cavity, the luggage compartment sound cavity, the door sound cavity, and the rear side wall sound cavity, and assigning a second acoustic material property to at least one of the seat sound cavity, the center console instrument panel sound cavity, and the coat rack sound cavity; According to the first acoustic material properties of at least one of the passenger compartment sound cavity, the trunk sound cavity, the door sound cavity and the rear side panel sound cavity, and the second acoustic material properties of at least one of the seat sound cavity, the center console sound cavity and the clothes rack sound cavity, the sound cavity modal analysis is performed on the sound cavity mesh model to obtain the frequency of the sound cavity mode.

2. The vehicle interior acoustic cavity modeling method according to claim 1, characterized in that: The interior area of ​​the vehicle is divided into blocks to obtain different acoustic cavity block areas, including: An area surrounded by a plurality of the following: a front windshield, a roof sheet metal, a sunroof, a rear windshield, a coat rack upper trim, a front floor sheet metal, a dashboard surface, a center console surface, front and rear seat surfaces, front and rear door inner panel sheets, and a door glass is used as the passenger compartment sound cavity; An area surrounded by the front and rear seat surfaces and the floor sheet metal is used as the seat sound cavity; An area surrounded by a plurality of the instrument panel surface, the center console surface, the front panel sheet metal and the floor sheet metal is used as the center console instrument panel sound cavity; An area surrounded by a plurality of the following: a coat rack sheet metal, a rear tailgate inner panel sheet metal, a spare tire well sheet metal, a rear side panel inner panel sheet metal, and a rear seat surface is used as the luggage compartment sound cavity; An area surrounded by the inner and outer panels of the front and rear doors is used as the door sound cavity; An area surrounded by the inner and outer panels of the rear side enclosure is used as the rear side enclosure sound cavity; The area surrounded by the coat rack sheet metal and the coat rack decorative plate is used as the coat rack sound cavity.

3. The method for modeling the in-vehicle acoustic cavity according to claim 2, characterized in that: The acoustic cavity grid model is established according to the boundaries of different acoustic cavity block areas, including: The different acoustic cavity block areas are separated according to the connection relationship between them, or coupled in a common node manner.

4. The method for modeling the in-vehicle acoustic cavity according to claim 3, characterized in that: Separating or coupling in a common node manner according to the connection relationship between the different acoustic cavity block areas includes: The passenger compartment sound cavity and the seat sound cavity are coupled via a common node on the seat surface; The passenger compartment sound cavity and the central control instrument panel sound cavity are coupled via a common node on the lower surface of the instrument panel; The passenger compartment sound cavity and the door sound cavity are coupled by a common node at the position of the sheet metal hole of the door inner panel; The passenger compartment sound cavity and the coat rack sound cavity are coupled via a common node on the coat rack trim surface; The luggage box sound cavity and the coat rack sound cavity are coupled by a common node at the position of the coat rack sheet metal hole; The luggage compartment sound cavity and the rear side panel cavity are coupled via a common node at the position of the sheet metal hole of the rear side panel inner plate.

5. The vehicle interior acoustic cavity modeling method according to claim 1, characterized in that: The first acoustic material property is the same acoustic material property as air, and the acoustic material property includes: at least one of density, sound velocity, and bulk modulus.

6. The vehicle interior acoustic cavity modeling method according to claim 1, characterized in that: The method further comprises: When the result of determining that the frequency of the acoustic cavity mode is unreasonable compared with the reference acoustic cavity mode frequency, adjusting the second acoustic material property of at least one of the seat acoustic cavity, the central control panel acoustic cavity, and the coat rack acoustic cavity; Acoustic cavity modal analysis is performed based on the adjusted second acoustic material properties of at least one of the seat acoustic cavity, the center console acoustic cavity and the clothes rack acoustic cavity, and the first acoustic material properties of at least one of the passenger compartment acoustic cavity, the trunk acoustic cavity, the door acoustic cavity and the rear side panel acoustic cavity.

7. The vehicle interior acoustic cavity modeling method according to claim 6, characterized in that: The result determined based on the frequency of the acoustic cavity mode and the reference acoustic cavity mode frequency is unreasonable, including: When the absolute value of the difference between the frequency of the acoustic cavity mode and the reference acoustic cavity mode frequency is greater than a preset threshold, it is determined that the result is unreasonable.

8. A vehicle interior acoustic cavity modeling system, characterized in that: The invention comprises a memory, a processor and a vehicle interior acoustic cavity modeling program stored in the memory and executable on the processor. When the processor executes the vehicle interior acoustic cavity modeling program, the vehicle interior acoustic cavity modeling method according to any one of claims 1 to 7 is implemented.

9. A computer-readable storage medium, characterized in that: A vehicle interior acoustic cavity modeling program is stored thereon, and when the vehicle interior acoustic cavity modeling program is executed by a processor, a vehicle interior acoustic cavity modeling method according to any one of claims 1-7 is implemented.

10. An electronic device, characterized in that: The invention comprises a memory, a processor and a vehicle interior acoustic cavity modeling program stored in the memory and executable on the processor. When the processor executes the vehicle interior acoustic cavity modeling program, the vehicle interior acoustic cavity modeling method according to any one of claims 1 to 7 is implemented.

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