Vehicle body structure optimization method and device based on noise transfer function, equipment and medium

Abstract

The invention discloses a vehicle body structure optimization method and device based on a noise transfer function, computer equipment and a storage medium, and the method comprises the steps: building an in-vehicle vocal cavity model according to a vehicle body metal plate structure, carrying out the partitioning of the vocal cavity model according to the specific position of a metal plate in the vehicle body, and carrying out the calculation of the vocal cavity model; the method comprises the steps of obtaining a sound cavity surface area, obtaining a peak frequency band of a sound transfer function curve by calculating the sound transfer function curve from the sound cavity surface area to a driver position and a non-driver position, and adjusting a vehicle body metal plate structure by analyzing the peak frequency band of the sound transfer function curve, so that the mode of the adjusted vehicle body metal plate is not in the peak frequency band. According to the vehicle body structure optimization method, the vehicle body structure is adjusted and optimized through the peak frequency band of the sound transfer function curve, so that the vehicle body structure is adjusted more reasonably, risk points can be effectively reduced when the adjusted vehicle body structure is used for later NTF analysis, the optimization workload is reduced, and the vehicle body performance is improved.

Description

Technical Field

[0001] The present application relates to the technical field of automobile body design, and in particular to a method, device, computer equipment and storage medium for optimizing a vehicle body structure based on a noise transfer function. Background Art

[0002] Whether the noise transfer function (NTF) is reasonable is an important evaluation criterion for the development of vehicle body NVH (noise, vibration and harshness). Its optimization effect is crucial to improving vehicle comfort. The traditional vehicle body structure optimization method lacks reliable design suggestions in the early stage of design and relies too much on the experience of design engineers. After the vehicle body structure is determined according to the experience of engineers, the subsequent NTF analysis is carried out, resulting in a relatively high probability of risk points in the vehicle body NTF analysis results, which increases the workload of vehicle body NTF analysis optimization.

[0003] Therefore, how to avoid the risks caused by the designer's lack of experience and give reliable design suggestions to reduce the probability of risks has become an urgent problem to be solved. Summary of the invention

[0004] Based on this, the embodiments of the present application provide a vehicle body structure optimization method, device, computer equipment and storage medium based on noise transfer function to solve the problem of a high probability of risk points appearing in the subsequent NTF analysis due to the current determination of the vehicle body structure based on manual experience.

[0005] In a first aspect, an embodiment of the present application provides a vehicle body structure optimization method based on noise transfer function, comprising:

[0006] According to the sheet metal structure of the vehicle body, an in-vehicle acoustic cavity model is established; according to the specific sheet metal position of the vehicle body, the surface of the in-vehicle acoustic cavity model is divided into regions to obtain N acoustic cavity surface regions, where N>2;

[0007] Calculating the sound transfer function curves from each of the acoustic cavity surface areas to the driver's position in the vehicle and / or the non-driver's position in the vehicle;

[0008] Extracting the peak frequency band of each sound transfer function curve according to the sound transfer function curves from each of the sound cavity surface areas to the driver position and / or the non-driver position in the vehicle;

[0009] The vehicle body structure is adjusted so that the modal frequency of the vehicle body sheet metal obtained by performing a vehicle body modal analysis after the adjustment of the vehicle body structure is not within the peak frequency band.

[0010] In a second aspect, an embodiment of the present application provides a vehicle body structure optimization device based on noise transfer function, comprising:

[0011] The acoustic cavity surface area division module is used to establish an in-vehicle acoustic cavity model according to the sheet metal structure of the vehicle body; the surface of the in-vehicle acoustic cavity model is divided into regions according to the specific sheet metal positions of the vehicle body, and N acoustic cavity surface regions are obtained by division, where N>2;

[0012] A sound transfer function curve calculation module, used to calculate the sound transfer function curves from each of the acoustic cavity surface areas to the driver's position in the vehicle and / or the non-driver's position in the vehicle;

[0013] A peak frequency band extraction module, used to extract the peak frequency band of each sound transfer function curve according to the sound transfer function curve from each of the acoustic cavity surface areas to the driver position and / or the non-driver position in the vehicle;

[0014] The structural adjustment module is used to adjust the vehicle body structure so that the modal frequency of the vehicle body sheet metal obtained by performing a vehicle body modal analysis after the vehicle body structure is adjusted is not within the peak frequency band.

[0015] In a third aspect, an embodiment of the present application provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the vehicle body structure optimization method based on the noise transfer function as described in the first aspect above is implemented.

[0016] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of a vehicle body structure optimization method based on noise transfer function are implemented.

[0017] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0018] The vehicle body structure optimization method, device, equipment and medium based on noise transfer function of the present application first establishes an in-vehicle sound cavity model according to the vehicle body sheet metal structure, partitions the sound cavity model according to the specific position of the sheet metal in the vehicle body, and obtains multiple sound cavity surface areas, and obtains the peak frequency band of the sound transfer function curve by calculating the sound cavity surface area to the driver and non-driver positions, and adjusts and optimizes the vehicle body sheet metal structure according to the analysis of the peak frequency band of the sound transfer function curve, so that the adjusted and optimized vehicle body sheet metal mode is not within the peak frequency band. The vehicle body structure optimization method of the present application optimizes the vehicle body structure by adjusting the peak frequency band of the sound transfer function curve, so that the vehicle body structure adjustment is more reasonable, and the risk points can be effectively reduced when the adjusted vehicle body structure is used for the subsequent NTF analysis, thereby reducing the optimization workload and improving the vehicle body performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0020] Figure 1 It is a schematic diagram of an application environment of a vehicle body structure optimization method based on noise transfer function provided by an embodiment of the present application;

[0021] Figure 2 It is a flow chart of a vehicle body structure optimization method based on noise transfer function provided by an embodiment of the present application;

[0022] Figure 3 It is a schematic diagram of a vehicle interior acoustic cavity model of a vehicle body structure optimization method based on noise transfer function provided in one embodiment of the present application;

[0023] Figure 4 is another flow chart of a vehicle body structure optimization method based on noise transfer function provided by an embodiment of the present application;

[0024] Figure 5 is another flow chart of a vehicle body structure optimization method based on noise transfer function provided by an embodiment of the present application;

[0025] Figure 6 is a schematic diagram of a sound transfer function curve of a vehicle body structure optimization method based on noise transfer function provided by an embodiment of the present application;

[0026] Figure 7 It is a schematic diagram of a peak frequency band distribution diagram of a sound transfer function of a vehicle body structure optimization method based on noise transfer function provided by an embodiment of the present application;

[0027] Figure 8 is a structural schematic diagram of a vehicle body structure optimization device based on noise transfer function provided by an embodiment of the present application; DETAILED DESCRIPTION

[0028] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0029] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0030] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0031] As used in the specification and appended claims of this application, the term "if" can be interpreted as "when" or "uponce" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "uponce it is determined" or "in response to determining" or "uponce [described condition or event] is detected" or "in response to detecting [described condition or event]", depending on the context.

[0032] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0033] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0034] It should be understood that the size of the serial numbers of the steps in the following embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0035] In order to illustrate the technical solution of the present application, a specific embodiment is provided below for illustration.

[0036] An embodiment of the present application provides a vehicle body structure optimization method based on noise transfer function, which can be applied in Figure 1 In the application environment, specifically, the vehicle body structure optimization method based on noise transfer function of the present application is applied in a computer system, the system includes: Figure 1 The client and server shown in the figure communicate with each other through the network. The client, also known as the user end, refers to the program corresponding to the server and providing local services to the client. The client can be installed on, but not limited to, various personal computers, laptops, smart phones, tablets, and portable wearable devices. The server can be implemented as an independent server or a server cluster consisting of multiple servers.

[0037] See also Figure 2 , is a flow chart of a vehicle body structure optimization method based on noise transfer function of the present application, the vehicle body structure optimization method based on noise transfer function is applied to Figure 1 Servers in .

[0038] In one embodiment, if Figure 2 As shown, the vehicle body structure optimization method based on noise transfer function may include the following steps:

[0039] Step S21, establishing an in-vehicle acoustic cavity model according to the sheet metal structure of the vehicle body; dividing the surface of the in-vehicle acoustic cavity model into regions according to the specific sheet metal positions of the vehicle body, and obtaining N acoustic cavity surface regions, where N>2;

[0040] Specifically, an in-vehicle acoustic cavity model is established according to the body sheet metal structure. For example, the in-vehicle acoustic cavity model can be established in computer-aided design CAE (Computer Aided Engineering) software, and the surface of the in-vehicle acoustic cavity model is partitioned according to the position of the body sheet metal to obtain N acoustic cavity surface areas.

[0041] For example, refer to Figure 3 , is a schematic diagram of a vehicle interior acoustic cavity model provided by an embodiment of the present invention, such as Figure 3 As shown, the surface of the interior acoustic cavity model includes the front enclosure, front windshield, front roof, rear roof, front door, rear door, rear side enclosure and other areas.

[0042] Step S22, calculating the sound transfer function curves from each of the acoustic cavity surface areas to the driver's position in the vehicle and / or the non-driver's position in the vehicle;

[0043] Specifically, the sound transfer function refers to a functional relationship between the input excitation load and the output noise, which is used to evaluate the sensitivity of the structure to vibration sound. The expression of the sound transfer function is H = P / F, where H represents the sound transfer function; P represents the sound pressure value at the human ear, which can be the sound pressure value at the driver's position or the sound pressure value at the non-driver's position; and F represents the input excitation force, that is, the excitation at the node of the surface area of ​​the sound cavity.

[0044] Therefore, in the embodiment of the present invention, the sound transfer function is used to calculate the sound transfer function curves from each of the acoustic cavity surface areas to the driver's position in the vehicle and / or the non-driver's position in the vehicle.

[0045] Step S23, extracting the peak frequency band of each sound transfer function curve according to the sound transfer function curve from each of the acoustic cavity surface areas to the driver position and / or the non-driver position in the vehicle;

[0046] Specifically, after obtaining the sound transfer function curves from each acoustic cavity surface area to the driver's position in the vehicle and / or the non-driver's position in the vehicle, the peak frequency band of each sound transfer function curve can be extracted by detecting the peak value of the sound transfer function curve. For example, for the front area of ​​the surface of the acoustic cavity model in the vehicle, after obtaining the sound transfer function curve from the front area to the driver's position in the vehicle, the peak value of the sound transfer function curve is detected to extract the peak frequency band of the sound transfer function curve. Therefore, for each acoustic cavity surface area, the peak frequency band of each sound transfer function curve is extracted.

[0047] Step S24, adjusting the vehicle body structure so that the modal frequency of the vehicle body sheet metal obtained by performing a vehicle body modal analysis after the adjustment of the vehicle body structure is not within the peak frequency band.

[0048] Specifically, after the peak frequency bands of each sound transfer function curve are extracted, the vehicle body structure corresponding to the peak frequency band is adjusted for each acoustic cavity surface area so that the modal frequency of the adjusted vehicle body structure is not within the peak frequency band.

[0049] For example, assuming that the peak frequency band of the front area is 90-100Hz, but the vibration of the front sheet metal under this peak frequency band may cause a peak at the driver's position in the vehicle, the body structure is adjusted, and the body modal analysis is performed based on the adjusted body structure to obtain the corresponding modal frequency of the body sheet metal, and then it is detected whether the obtained modal frequency is still within the peak frequency band of 90-100Hz. If it is detected that the obtained modal frequency is still within the peak frequency band of 90-100Hz, the body structure is continued to be adjusted until the obtained modal frequency is no longer within the peak frequency band of 90-100Hz, so that the modal frequency of the body sheet metal can be optimized to, for example, a peak frequency band of 110-120Hz.

[0050] The vehicle body structure optimization method based on noise transfer function in the embodiment of the present application first establishes an in-vehicle sound cavity model according to the vehicle body sheet metal structure, and partitions the sound cavity model to obtain multiple sound cavity surface areas, and obtains the peak frequency band of the sound transfer function curve by calculating the sound transfer function curve from the sound cavity surface area to the driver and / or non-driver position. Furthermore, the vehicle body sheet metal structure is adjusted and optimized through the peak frequency band of the sound transfer function curve, so that the adjusted and optimized vehicle body sheet metal mode is not within the peak frequency band. The vehicle body structure optimization method of the present application optimizes the vehicle body structure through the peak frequency band of the sound transfer function curve, solves the problem of relatively large risk probability caused by limited or insufficient manual experience, reduces the optimization workload, and improves vehicle body performance.

[0051] In one embodiment, if Figure 4 As shown, in step S22, calculating the sound transfer function curves from each of the acoustic cavity surface areas to the driver position in the vehicle and / or the non-driver position in the vehicle may include the following steps:

[0052] Step S31, determining key nodes in each of the acoustic cavity surface areas;

[0053] Specifically, the key nodes are representative nodes selected from each acoustic cavity surface area, and the number of key nodes selected from each acoustic cavity surface area may be different. For example, for the front area, one node in the front area may be selected as one key node, or two or three nodes in the front area may be selected as key nodes. The number of key nodes is set according to the specific usage.

[0054] Step S32, calculating the sound transfer function curve from the key nodes in each of the acoustic cavity surface areas to the driver's position in the vehicle, and obtaining a sound transfer function curve representing the sound transfer function curve from the acoustic cavity surface area to the driver's position in the vehicle;

[0055] Specifically, for any acoustic cavity surface area, when the acoustic cavity surface area has only one key node, the above-mentioned sound transfer function formula is used to calculate the sound transfer function curve from the key node to the driver's position in the vehicle, that is, the sound transfer function curve from the acoustic cavity surface area to the driving position in the vehicle; when the acoustic cavity surface area has multiple key nodes, that is, the number of key nodes is greater than 1, the sound transfer function curve from each key node to the driver's position in the vehicle is calculated separately, so that according to the sound transfer function curves corresponding to all the key nodes, a sound transfer function curve representing the acoustic cavity surface area to the driver's position in the vehicle can be obtained.

[0056] For example, when the number of key nodes in the front windshield area is 1, the sound transfer function curve from the key node to the driver's position in the vehicle is calculated, and used as the sound transfer function curve representing the front windshield area to the driver's position in the vehicle; when the number of key nodes in the front windshield area is 3, the sound transfer function curve from each key node to the driver's position in the vehicle is calculated separately, and a total of 3 sound transfer function curves corresponding to the front windshield area are obtained, and according to these 3 sound transfer function curves, processing is performed to obtain 1 sound transfer function curve representing the surface area of ​​the acoustic cavity to the driver's position in the vehicle.

[0057] Step S33, calculating the sound transfer function curve from the key nodes in each of the acoustic cavity surface areas to the non-driver positions in the vehicle, and obtaining the sound transfer function curve representing the sound cavity surface area to the non-driver positions in the vehicle.

[0058] Specifically, referring to the method for obtaining the sound transfer function curve in the above-mentioned steps S31 and S32, the sound transfer function curve from the key nodes in each acoustic cavity surface area to the non-driver position in the vehicle is calculated, and then a sound transfer function curve representing the acoustic cavity surface area to the non-driver position in the vehicle is obtained.

[0059] The vehicle body structure optimization method based on the noise transfer function of the embodiment of the present application determines the key nodes of the sound cavity surface area, calculates the sound transfer function curves from the key nodes to the driver and non-driver positions in the vehicle according to the sound transfer function formula, and obtains the sound transfer function curve representing the sound cavity surface area to the non-driver position in the vehicle. The vehicle body structure optimization method of the present application obtains a representative sound transfer function curve through the sound transfer function formula, so as to obtain a more accurate sound transfer function peak frequency band distribution diagram in the subsequent steps.

[0060] In one embodiment, if Figure 5 As shown, in step S22, calculating the sound transfer function curves from each of the acoustic cavity surface areas to the driver position in the vehicle and / or the non-driver position in the vehicle may include the following steps:

[0061] Step S41, determining the M in each of the acoustic cavity surface areas i nodes, M i >1, i represents the number of the acoustic cavity surface area, i = 1, 2, ..., N;

[0062] Specifically, for any acoustic cavity surface area, any node of the acoustic cavity surface area is selected. If the shape of the acoustic cavity surface area is a rectangle, there are 4 nodes. If the shape of the acoustic cavity surface area is a pentagon, there are 5 nodes. N is used to represent the number of acoustic cavity surface areas included in the in-vehicle acoustic cavity model, such as Figure 3 There are 7 acoustic cavity surface areas in the vehicle interior acoustic cavity model shown, so N=7.

[0063] Step S42, calculating the M in each of the acoustic cavity surface areas i The sound transfer function curves from the nodes to the driver's position in the car correspond to the surface areas of the acoustic cavity, and M i A first sound transfer function curve;

[0064] Specifically, for any node in any acoustic cavity surface area, the sound transfer function curve from the node to the driver's position in the vehicle is calculated according to the sound transfer function, and used as the first sound transfer curve. Similarly, according to the M nodes in the acoustic cavity surface area, the first sound transfer function curve from each node to the driver's position in the vehicle is calculated respectively, thereby obtaining M first sound transfer function curves, that is, one node corresponds to one first sound transfer function curve. Therefore, corresponding to each acoustic cavity surface area, each acoustic cavity surface area corresponds to M sound transfer function curves.

[0065] Step S43, corresponding to each of the acoustic cavity surface areas, i processing the first sound transfer function curves to obtain N first sound transfer function curves from the surface area of ​​the acoustic cavity to the driver's position in the vehicle;

[0066] Specifically, for any acoustic cavity surface area, after obtaining M first sound transfer function curves in the acoustic cavity surface area, the M first sound transfer function curves are processed by root mean square value, and a first sound transfer function curve representing the acoustic cavity surface area to the driver's position in the vehicle is obtained. The calculation formula of the root mean square value is:

[0067]

[0068] Among them, X s is the first sound transfer function curve from the sth acoustic cavity surface area to the driver's position in the car, M is the number of nodes in the sth acoustic cavity surface area, X i is the first sound transfer function curve from the i-th node in the s-th acoustic cavity surface area to the driver's position in the vehicle, i=1,2,…,M;

[0069] For example, see Figure 6 , is a schematic diagram of a sound transfer function curve provided by an embodiment of the present invention, such as Figure 6 As shown, curve 1 represents the first sound transfer function curve from node 1 to the driver's position in the vehicle, curve 2 represents the first sound transfer function curve from node 2 to the driver's position in the vehicle, and curve 3 represents the first sound transfer function curve from the corresponding acoustic cavity surface area to the driver's position in the vehicle after curve 1 and curve 2 are processed by the root mean square formula.

[0070] Similarly, for each acoustic cavity surface area, a representative first sound transfer function curve from each acoustic cavity surface area to the driver's position in the vehicle is obtained based on the first sound transfer function curve from the M nodes in each acoustic cavity surface area to the driver's position in the vehicle, thereby obtaining the first sound transfer function curves corresponding to the N acoustic cavity surface areas to the driver's position in the vehicle.

[0071] Step S44, calculating the M in each of the acoustic cavity surface areas i The sound transfer function curves from each node to the non-driver position in the car, corresponding to each of the acoustic cavity surface areas, can be obtained as i A second sound transfer function curve;

[0072] Refer to the above steps S42 to S43, and the details will not be repeated here.

[0073] Step S45, corresponding to each of the acoustic cavity surface areas, i processing the second sound transfer function curves to obtain N second sound transfer function curves from the surface area of ​​the acoustic cavity to the non-driver position in the vehicle;

[0074] Refer to the above steps S42 to S43, and the details will not be repeated here.

[0075] The vehicle body structure optimization method based on the noise transfer function of the embodiment of the present application determines the M of the surface area of ​​the sound cavity. i nodes, calculate M iThe sound transfer function curves from each node to the driver's position and the non-driver's position in the vehicle are obtained to obtain a first sound transfer function curve and a second sound transfer function curve, so as to obtain a more accurate sound transfer function frequency band distribution diagram in subsequent steps.

[0076] In one embodiment, after step S43, calculating and obtaining the first sound transfer function curves from the N acoustic cavity surface areas to the driver's position in the vehicle, the following steps may also be included:

[0077] Combining the first sound transfer function curves from the N acoustic cavity surface areas to the driver's position in the vehicle into a peak frequency band distribution diagram of the first sound transfer function of the acoustic cavity surface;

[0078] Specifically, N acoustic cavity surface areas are arranged to obtain corresponding area arrangement results, and the first sound transfer function curves from each acoustic cavity surface area to the driver's position in the vehicle are combined with reference to the area arrangement results, so as to obtain the peak frequency band distribution diagram of the first sound transfer function of the acoustic cavity surface area. It is worth noting that the arrangement order of the N acoustic cavity surface areas can be customized.

[0079] For example, see Figure 7 , is a peak frequency band distribution diagram of a sound transfer function provided by an embodiment of the present invention, such as Figure 7 As shown, all the sound cavity surface areas in the in-vehicle sound cavity model are arranged as the front surround, front windshield, front of the ceiling, rear of the ceiling, tailgate, front floor, middle floor, rear floor, front door, rear door, and rear side door, and the first sound transfer function curves from these areas to the driver's position in the car are arranged and combined to obtain the corresponding first sound transfer function peak frequency band distribution diagram.

[0080] After step S45, the second sound transfer function curves from the N acoustic cavity surface areas to the non-driver position in the vehicle are calculated; the following steps may also be included:

[0081] Combining the second sound transfer function curves from the N acoustic cavity surface areas to the non-driver position in the vehicle into a second sound transfer function peak frequency band distribution diagram of the acoustic cavity surface;

[0082] Referring to the above steps of obtaining the first sound transfer function peak frequency band distribution diagram, the sound transfer function curves from the N acoustic cavity surface areas to the non-driver position in the vehicle are combined into a second sound transfer function peak frequency band distribution diagram of the acoustic cavity surface, which will not be repeated here.

[0083] The vehicle body structure optimization method based on noise transfer function in the embodiment of the present application synthesizes a first sound transfer function peak frequency band distribution diagram and a second sound transfer function peak frequency band distribution diagram by processing the sound transfer function curve from the surface area of ​​the sound cavity to the driver and / or non-driver in the vehicle, so as to optimize the vehicle body sheet metal structure through the peak frequency band distribution diagram in the subsequent steps.

[0084] In one embodiment, in step S23, according to the sound transfer function curves from each of the acoustic cavity surface areas to the driver position and / or the non-driver position in the vehicle, extracting the peak frequency band of each of the sound transfer function curves may include the following steps:

[0085] Extracting the peak value of the sound transfer function curve from each of the acoustic cavity surface areas to the driver position and / or non-driver position in the vehicle, and the specific frequency corresponding to the peak value;

[0086] Specifically, in the sound transfer curve, the horizontal axis represents the frequency and the vertical axis represents the decibel. A decibel threshold is preset. For the sound transfer function curve from any acoustic cavity surface area to the driver's position and / or the non-driver's position in the vehicle, each decibel value on the sound transfer function curve is compared with the decibel threshold to obtain all target decibel values ​​greater than the decibel threshold, and each target decibel value is the peak value of the sound transfer function curve. Furthermore, according to each peak value of the sound transfer function curve on the vertical axis, the corresponding frequency on the horizontal axis can be obtained as a specific frequency. A peak value of the sound transfer function curve corresponds to a specific frequency. For example, assuming there are four peaks y1, y2, y3, and y4, the frequency corresponding to each peak is x1, x2, x3, and x4. If there is only one peak, there is only one specific frequency, and y corresponds to x one by one.

[0087] According to the specific frequencies corresponding to the peaks, a frequency band including the specific frequencies is determined as the peak frequency band of each sound transfer function curve.

[0088] Specifically, when the state of the peak frequency band is continuous, the continuous frequency band is extracted as the peak frequency band. Each continuous specific frequency band corresponds to a peak frequency band. For example, for the sound transfer function curve of the front area, there are five peak frequency bands, namely 20-26Hz, 46-68Hz, 86-98Hz, 130-154Hz, and 182-188Hz. Similarly, there are other acoustic cavity surface areas in the vehicle interior acoustic cavity surface area model, and the sound transfer function curve of each acoustic cavity surface area has a peak frequency band. Therefore, for the sound transfer function curves corresponding to each acoustic cavity surface area, each sound transfer function curve can extract the corresponding peak frequency band.

[0089] The vehicle body structure optimization method based on noise transfer function in the embodiment of the present application extracts the peak values ​​of the sound transfer function curves from the surface area of ​​the sound cavity to the driver position and the non-driver position in the vehicle, as well as the specific frequencies corresponding to the peak values, so as to optimize the vehicle body sheet metal structure through the peak frequency band in subsequent steps.

[0090] In one embodiment, in step S23, according to the sound transfer function curves from each of the acoustic cavity surface areas to the driver position and / or the non-driver position in the vehicle, extracting the peak frequency band of each of the sound transfer function curves may include the following steps:

[0091] Extracting the first peak frequency band of each of the sound transfer function curves according to the first sound transfer function peak frequency band distribution diagram of the sound cavity surface area; and extracting the second peak frequency band of each of the sound transfer function curves according to the second sound transfer function peak frequency band distribution diagram of the sound cavity surface area;

[0092] Refer to the above steps to extract the peak frequency band, extract the continuous frequency band as the peak frequency band, for example, refer to Figure 6 , which is a peak frequency band distribution diagram of the first sound transfer function provided by an embodiment of the present invention, such as Figure 6 As shown, taking the front windshield area as an example, the peak frequency bands extracted from the front windshield area are 20-24Hz and 46-60Hz, of which 46Hz-60Hz is the first frequency band, and 112Hz-148Hz is the second frequency band. The first frequency band is greater than the second frequency band, and the first frequency band is used as the first peak frequency band from the sound cavity surface area to the non-driver position in the car.

[0093] In step S24, the vehicle body structure is adjusted so that the modal frequency of the vehicle body sheet metal obtained by performing a vehicle body modal analysis after the adjustment of the vehicle body structure is not within the peak frequency band, which may include the following steps:

[0094] The vehicle body structure is adjusted so that the modal frequency of the vehicle body sheet metal obtained by performing a vehicle body modal analysis after the adjustment of the vehicle body structure is not within the first peak frequency band and the second peak frequency band.

[0095] Specifically, after extracting the first peak frequency band of each sound transfer function curve, the vehicle body structure corresponding to the peak frequency band is adjusted for each acoustic cavity surface area so that the modal frequency of the adjusted vehicle body structure is not within the first peak frequency band.

[0096] For example, assuming that the first peak frequency band of the front windshield area is 20-24Hz, but the vibration of the front panel metal under the first peak frequency band may cause a peak to appear at the driver's position in the vehicle, the body structure is adjusted, and the body modal analysis is performed based on the adjusted body structure to obtain the corresponding modal frequency of the body sheet metal, and then it is detected whether the obtained modal frequency is still within the first peak frequency band of 20-24Hz. If it is detected that the obtained modal frequency is still within the first peak frequency band of 20-24Hz, the body structure continues to be adjusted until the obtained modal frequency is no longer within the first peak frequency band of 20-24Hz, so that the modal frequency of the body sheet metal can be optimized to, for example, a peak frequency band of 30-40Hz.

[0097] Similarly, after extracting the second peak frequency band of each sound transfer function curve, the vehicle body structure corresponding to the peak frequency band is adjusted for each acoustic cavity surface area so that the modal frequency of the adjusted vehicle body structure is not within the second peak frequency band.

[0098] The vehicle body structure optimization method based on the noise transfer function of the embodiment of the present application adjusts the vehicle body structure according to the peak frequency band distribution diagram of the sound transfer function to avoid the peak frequency band, thereby achieving an optimization effect.

[0099] In one embodiment, if Figure 2 As shown, a vehicle body structure optimization method based on noise transfer function may include the following steps:

[0100] The vehicle body structure is adjusted so that the peak frequency of the curve obtained by performing vibration transfer function analysis or equivalent radiated sound power analysis after the vehicle body structure is adjusted is not within the peak frequency band.

[0101] Specifically, the vibration transfer function is the ratio of the Laplace change of the linear system response (output) to the Laplace transform of the excitation (input). The expression of the vibration transfer function is H(s) = Y(s) / U(s), where H(s) is the vibration transfer function; Y(s) is the output, which is the sound pressure value at the human ear, which can be the sound pressure value at the driver's position or the sound pressure value at the non-driver's position; U(s) is the input, which is the output excitation force of the nodes in the surface area of ​​the acoustic cavity.

[0102] Therefore, a vibration transfer function analysis is performed on the adjusted vehicle body structure to obtain the corresponding modal frequency of the vehicle body sheet metal, and then it is detected whether the obtained modal frequency is still within the peak frequency band. If it is detected that the obtained modal frequency is still within the peak frequency band, the vehicle body structure is continuously adjusted until the obtained modal frequency is no longer within the peak frequency band.

[0103] It should be noted that the equivalent radiated sound power ERP is used to evaluate the relationship between panel vibration and NTF response. The calculation formula for the equivalent radiated sound power is:

[0104]

[0105] Among them, ERP is the equivalent radiated acoustic power; δ is the radiation loss factor; C is the speed of sound; ρ is the fluid density; Ai is the unit area; and vi is the unit normal velocity.

[0106] The above equivalent radiated sound power is converted into the sound pressure level expression:

[0107]

[0108] Wherein, the scaling factor used for calculation is P=1.0; R is the reference value (2×10-5Pa).

[0109] Therefore, it is also possible to perform an equivalent radiated sound power analysis on the adjusted vehicle body structure to obtain the corresponding modal frequency of the vehicle body structure, and then detect whether the obtained modal frequency is still within the peak frequency band. If it is detected that the obtained modal frequency is still within the peak frequency band, continue to adjust the vehicle body structure until the obtained modal frequency is no longer within the peak frequency band.

[0110] The embodiment of the present application provides a vehicle body structure optimization method based on the noise transfer function, which uses the vibration transfer function or equivalent radiated sound power test to adjust the vehicle body structure to determine whether the curve peak is within the peak frequency band, so as to better improve the vehicle body performance.

[0111] Corresponding to a vehicle body structure optimization method based on noise transfer function in the above embodiment, Figure 8 The structural block diagram of a vehicle body structure optimization device based on noise transfer function provided by an embodiment of the present application is shown, and the vehicle body structure optimization device is applied to a terminal device. For the convenience of description, only the part related to the embodiment of the present application is shown.

[0112] In one embodiment, if Figure 8 As shown, a vehicle body structure optimization device based on noise transfer function includes:

[0113] The acoustic cavity surface area acquisition module is used to establish an in-vehicle acoustic cavity model according to the sheet metal structure of the vehicle body; the surface of the in-vehicle acoustic cavity model is divided into regions according to the specific sheet metal positions of the vehicle body, and N acoustic cavity surface regions are obtained by division, where N>2;

[0114] A sound transfer function curve acquisition module is used to calculate the sound transfer function curves from each of the acoustic cavity surface areas to the driver's position in the vehicle and / or the non-driver's position in the vehicle;

[0115] A peak frequency band extraction module, used to extract the peak frequency band of each sound transfer function curve according to the sound transfer function curve from each of the acoustic cavity surface areas to the driver position and / or the non-driver position in the vehicle;

[0116] The peak frequency band processing module is used to adjust the vehicle body structure so that the modal frequency of the vehicle body sheet metal obtained by performing a vehicle body modal analysis after the vehicle body structure is adjusted is not within the peak frequency band.

[0117] Optionally, the vehicle body structure optimization device further includes:

[0118] A key node acquisition module, used to determine the key nodes in each of the acoustic cavity surface areas;

[0119] A sound transfer function curve acquisition module at the driver's position is used to calculate the sound transfer function curve from the key nodes in each of the acoustic cavity surface areas to the driver's position in the vehicle, and obtain a sound transfer function curve representing the sound transfer function curve from the acoustic cavity surface area to the driver's position in the vehicle;

[0120] The non-driver sound transfer function curve acquisition module is used to calculate the sound transfer function curve from the key nodes in each of the acoustic cavity surface areas to the non-driver positions in the vehicle, and obtain the sound transfer function curve representing the sound cavity surface area to the non-driver positions in the vehicle.

[0121] Optionally, the vehicle body structure optimization device further includes:

[0122] A node determination module is used to determine the M in each of the acoustic cavity surface areas. i nodes, M i >1, i represents the number of the acoustic cavity surface area, i = 1, 2, ..., N;

[0123] M i A sound transfer function curve acquisition module is used to calculate the M in each of the acoustic cavity surface areas. i The sound transfer function curves from the nodes to the driver's position in the car correspond to the surface areas of the acoustic cavity, and M i A sound transfer function curve;

[0124] N sound transfer function curve acquisition modules are used to correspond to each of the surface areas of the acoustic cavity, and to obtain M i The sound transfer function curves are processed to obtain N sound transfer function curves from the surface area of ​​the acoustic cavity to the driver's position in the vehicle;

[0125] M i A sound transfer function curve processing module is used to calculate the M in each of the acoustic cavity surface areas. iThe sound transfer function curves from each node to the non-driver position in the car, corresponding to each of the acoustic cavity surface areas, can be obtained as i A sound transfer function curve;

[0126] N sound transfer function curve processing modules are used to correspond to the surface areas of the acoustic cavities, and to process the M i The sound transfer function curves are processed to obtain N sound transfer function curves from the surface area of ​​the acoustic cavity to the non-driver position in the vehicle;

[0127] Optionally, the vehicle body structure optimization device further includes:

[0128] A first sound transfer function peak frequency band distribution diagram acquisition module, used for combining the first sound transfer function curves from the N acoustic cavity surface areas to the driver's position in the vehicle into a first sound transfer function peak frequency band distribution diagram of the acoustic cavity surface;

[0129] A second sound transfer function peak frequency band distribution diagram acquisition module, used for combining the second sound transfer function curves from the N acoustic cavity surface areas to the non-driver position in the vehicle into a second sound transfer function peak frequency band distribution diagram of the acoustic cavity surface;

[0130] Optionally, the vehicle body structure optimization device further includes:

[0131] A peak value and specific frequency extraction module, used to extract the peak value of the sound transfer function curve from each of the acoustic cavity surface areas to the driver's position and / or non-driver's position in the vehicle, and the specific frequency corresponding to the peak value;

[0132] The peak frequency band determination module is used to determine, according to the specific frequencies corresponding to the peaks, a frequency band including the specific frequencies as the peak frequency band of each of the sound transfer function curves.

[0133] Optionally, the vehicle body structure optimization device further includes:

[0134] The first and second peak frequency band extraction modules are used to extract the first peak frequency band of each sound transfer function curve according to the first sound transfer function peak frequency band distribution diagram of the sound cavity surface; and extract the second peak frequency band of each sound transfer function curve according to the second sound transfer function peak frequency band distribution diagram of the sound cavity surface;

[0135] The first and second peak frequency band filtering modules are used to adjust the vehicle body structure so that the modal frequency of the vehicle body sheet metal obtained by performing a vehicle body modal analysis after the vehicle body structure is adjusted is not within the first peak frequency band and the second peak frequency band.

[0136] Optionally, the vehicle body structure optimization device further includes:

[0137] The peak frequency analysis module is used to adjust the vehicle body structure so that the peak frequency of the curve obtained by performing vibration transfer function analysis or equivalent radiated sound power analysis after the vehicle body structure is adjusted is not within the peak frequency band.

[0138] It should be noted that the information interaction, execution process and other contents between the above-mentioned modules are based on the same concept as the method embodiment of the present application. Their specific functions and technical effects can be found in the method embodiment part and will not be repeated here.

[0139] An embodiment of the present invention further provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and when the processor executes the computer program, the steps of the vehicle body structure optimization method based on noise transfer function described in any of the above embodiments are implemented.

[0140] The embodiment of the present invention also provides a computer readable medium having a non-volatile program code executable by a processor, wherein the program code enables the processor to execute the vehicle body structure optimization method based on the noise transfer function described in the above embodiment. Unless otherwise specifically stated, the relative steps, numerical expressions and numerical values ​​of the components and steps described in these embodiments do not limit the scope of the present invention.

[0141] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. In all the examples shown and described here, any specific value should be interpreted as merely exemplary, rather than as a limitation, and therefore, other examples of the exemplary embodiments may have different values. The flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the systems, methods and computer program products according to multiple embodiments of the present invention. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the module, program segment or a part of a code contains one or more executable instructions for implementing a specified logical function. It should also be noted that each box in the block diagram and / or the flowchart, and the combination of boxes in the block diagram and / or the flowchart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0142] In the several embodiments provided in the present invention, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, the functional units in various embodiments of the present invention can be integrated into a processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium.

[0143] Based on such understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: a disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, etc. Various media that can store program codes. Finally, it should be noted that the above-mentioned embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solution of the present invention, rather than to limit it. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solution recorded in the aforementioned embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or equivalently replace some of the technical features therein: and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiment of the present invention, and should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A vehicle body structure optimization method based on noise transfer function, characterized in that: The vehicle body structure optimization method based on noise transfer function includes: According to the sheet metal structure of the vehicle body, an in-vehicle acoustic cavity model is established; according to the specific sheet metal position of the vehicle body, the surface of the in-vehicle acoustic cavity model is divided into regions to obtain N acoustic cavity surface regions, where N>2; Calculating the sound transfer function curves from each of the acoustic cavity surface areas to the driver's position in the vehicle and / or the non-driver's position in the vehicle; Extracting the peak frequency band of each sound transfer function curve according to the sound transfer function curves from each of the sound cavity surface areas to the driver position and / or the non-driver position in the vehicle; The vehicle body structure is adjusted so that the modal frequency of the vehicle body sheet metal obtained by performing a vehicle body modal analysis after the adjustment of the vehicle body structure is not within the peak frequency band.

2. The vehicle body structure optimization method based on noise transfer function according to claim 1, characterized in that: Calculating the sound transfer function curves from each of the acoustic cavity surface areas to the driver position in the vehicle and / or the non-driver position in the vehicle includes: Determining key nodes in each of the acoustic cavity surface regions; Calculating the sound transfer function curve from the key nodes in each of the acoustic cavity surface areas to the driver's position in the vehicle, and obtaining a sound transfer function curve representing the sound transfer function curve from the acoustic cavity surface area to the driver's position in the vehicle; The sound transfer function curve from the key nodes in each of the acoustic cavity surface areas to the non-driver position in the vehicle is calculated to obtain a sound transfer function curve representing the sound cavity surface area to the non-driver position in the vehicle.

3. The vehicle body structure optimization method based on noise transfer function as claimed in claim 1, characterized in that: Calculating the sound transfer function curves from each of the acoustic cavity surface areas to the driver position in the vehicle and / or the non-driver position in the vehicle includes: Determine the M in each of the acoustic cavity surface areas i nodes, M i >1, i represents the number of the acoustic cavity surface area, i=1,2,…,N, N is a positive integer; Calculate the M in each of the acoustic cavity surface areas i The sound transfer function curves from the nodes to the driver's position in the car correspond to the surface areas of the acoustic cavity, and M i A first sound transfer function curve; Corresponding to each of the acoustic cavity surface areas, M i processing the first sound transfer function curves to obtain N first sound transfer function curves from the surface area of ​​the acoustic cavity to the driver's position in the vehicle; Calculate the M in each of the acoustic cavity surface areas i The sound transfer function curves from each node to the non-driver position in the car, corresponding to each of the acoustic cavity surface areas, can be obtained as i A second sound transfer function curve; Corresponding to each of the acoustic cavity surface areas, M i The second sound transfer function curves are processed to obtain N second sound transfer function curves from the surface area of ​​the acoustic cavity to the non-driver position in the vehicle.

4. The vehicle body structure optimization method based on noise transfer function as claimed in claim 3, characterized in that: After calculating and obtaining the first sound transfer function curves from the N acoustic cavity surface areas to the driver's position in the vehicle, the vehicle body structure optimization method further includes: Combining the first sound transfer function curves from the N acoustic cavity surface areas to the driver's position in the vehicle into a peak frequency band distribution diagram of the first sound transfer function of the acoustic cavity surface; After calculating and obtaining the second sound transfer function curves from the N acoustic cavity surface areas to the non-driver positions in the vehicle, the vehicle body structure optimization method further includes: The second sound transfer function curves from the N acoustic cavity surface areas to the non-driver position in the vehicle are combined into a second sound transfer function peak frequency band distribution diagram of the acoustic cavity surface.

5. The vehicle body structure optimization method based on noise transfer function as claimed in claim 1, characterized in that: According to the sound transfer function curves from the surface areas of the acoustic cavities to the driver's position in the vehicle and / or the non-driver's position in the vehicle, extracting the peak frequency band of each sound transfer function curve comprises: Extracting the peak value of the sound transfer function curve from each of the acoustic cavity surface areas to the driver position and / or non-driver position in the vehicle, and the specific frequency corresponding to the peak value; According to the specific frequencies corresponding to the peaks, a frequency band including the specific frequencies is determined as the peak frequency band of each sound transfer function curve.

6. The vehicle body structure optimization method based on noise transfer function as claimed in claim 4, characterized in that: According to the sound transfer function curves from the surface areas of the acoustic cavities to the driver's position in the vehicle and / or the non-driver's position in the vehicle, extracting the peak frequency band of each sound transfer function curve comprises: Extracting the first peak frequency band of each of the sound transfer function curves according to the first sound transfer function peak frequency band distribution diagram on the surface of the sound cavity; extracting the second peak frequency band of each of the sound transfer function curves according to the second sound transfer function peak frequency band distribution diagram on the surface of the sound cavity; The adjusting of the vehicle body structure so that the modal frequency of the vehicle body sheet metal obtained by performing the vehicle body modal analysis after the adjustment of the vehicle body structure is not within the peak frequency band includes: The vehicle body structure is adjusted so that the modal frequency of the vehicle body sheet metal obtained by performing a vehicle body modal analysis after the adjustment of the vehicle body structure is not within the first peak frequency band and the second peak frequency band.

7. The vehicle body structure optimization method based on noise transfer function as claimed in claim 1, characterized in that: The vehicle body structure optimization method further includes: The vehicle body structure is adjusted so that the peak frequency of the curve obtained by performing vibration transfer function analysis or equivalent radiated sound power analysis after the vehicle body structure is adjusted is not within the peak frequency band.

8. A vehicle body structure optimization device based on noise transfer function, characterized in that: The vehicle body structure optimization device based on noise transfer function includes: The acoustic cavity surface area division module is used to establish an in-vehicle acoustic cavity model according to the sheet metal structure of the vehicle body; the surface of the in-vehicle acoustic cavity model is divided into regions according to the specific sheet metal positions of the vehicle body, and N acoustic cavity surface regions are obtained by division, where N>2; A sound transfer function curve calculation module, used to calculate the sound transfer function curves from each of the acoustic cavity surface areas to the driver's position in the vehicle and / or the non-driver's position in the vehicle; A peak frequency band extraction module, used to extract the peak frequency band of each sound transfer function curve according to the sound transfer function curve from each of the acoustic cavity surface areas to the driver position and / or the non-driver position in the vehicle; and The structural adjustment module is used to adjust the vehicle body structure so that the modal frequency of the vehicle body sheet metal obtained by performing a vehicle body modal analysis after the vehicle body structure is adjusted is not within the peak frequency band.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the vehicle body structure optimization method based on noise transfer function as described in any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the vehicle body structure optimization method based on noise transfer function as claimed in any one of claims 1 to 7 is implemented.

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