Exhaust Pipe Noise Attenuation Evaluation Method, Device, Equipment and Storage Medium

Abstract

The present invention relates to the field of automotive NVH performance development. The present invention discloses a method, device, computer device and storage medium for evaluating the noise attenuation amount of an exhaust pipe. The method includes: obtaining a first noise attenuation amount from the exhaust pipe to the pressure relief valve; obtaining a second noise attenuation amount from the pressure relief valve to a specified position inside the vehicle; and determining a target noise attenuation amount from the exhaust pipe to the specified position inside the vehicle according to the first noise attenuation amount and the second noise attenuation amount. The present invention can obtain the noise attenuation amount from the exhaust pipe area to inside the vehicle and reduce the vehicle test time.

Description

Technical Field

[0001] The present invention relates to the field of automotive NVH performance development, and particularly to a method, device, computer device, and storage medium for evaluating the noise attenuation amount of an exhaust pipe. Background Art

[0002] When the vehicle accelerates at full throttle, the rear passengers often perceive the "hissing" airflow sound emitted by the exhaust pipe. This airflow sound generally occurs when the engine is operating at high speed, with a high frequency and low correlation with orders. The airflow sound greatly affects the comfort experience of passengers.

[0003] Therefore, it is necessary to find a method for evaluating the noise attenuation amount of the exhaust pipe to obtain the noise attenuation amount from the exhaust pipe area to the interior of the vehicle and reduce the vehicle test time. Summary of the Invention

[0004] Based on this, in view of the above technical problems, it is necessary to provide a method, device, computer device, and storage medium for evaluating the noise attenuation amount of an exhaust pipe to obtain the noise attenuation amount from the exhaust pipe area to the interior of the vehicle and reduce the vehicle test time.

[0005] A method for evaluating the noise attenuation amount of an exhaust pipe includes:

[0006] Obtaining a first noise attenuation amount from the exhaust pipe to the pressure relief valve;

[0007] Obtaining a second noise attenuation amount from the pressure relief valve to a specified position inside the vehicle;

[0008] Determining a target noise attenuation amount from the exhaust pipe to the specified position inside the vehicle according to the first noise attenuation amount and the second noise attenuation amount.

[0009] A device for evaluating the noise attenuation amount of an exhaust pipe includes:

[0010] A first attenuation amount determination module, configured to obtain a first noise attenuation amount from the exhaust pipe to the pressure relief valve;

[0011] A second attenuation amount determination module, configured to obtain a second noise attenuation amount from the pressure relief valve to a specified position inside the vehicle;

[0012] A target attenuation amount determination module, configured to determine a target noise attenuation amount from the exhaust pipe to the specified position inside the vehicle according to the first noise attenuation amount and the second noise attenuation amount.

[0013] A computer device includes a memory, a processor, and computer-readable instructions stored in the memory and executable on the processor. When the processor executes the computer-readable instructions, the above method for evaluating the noise attenuation amount of an exhaust pipe is implemented.

[0014] One or more readable storage media storing computer-readable instructions that, when executed by one or more processors, cause the one or more processors to execute the exhaust pipe noise attenuation amount evaluation method as described above.

[0015] For the above exhaust pipe noise attenuation amount evaluation method, device, computer device and storage medium, by calculating the first noise attenuation amount, the attenuation amount of the noise emitted from the exhaust pipe area to the pressure relief valve can be determined. There is no need to manufacture test samples, which reduces manpower and material resources and shortens the iterative verification time for noise optimization. Then, the second noise attenuation amount is measured in a real anechoic chamber, and finally the two noise attenuation amounts are superimposed to obtain the target noise attenuation amount from the exhaust pipe area to the vehicle interior, greatly reducing the vehicle test time. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 is a flowchart of the exhaust pipe noise attenuation amount evaluation method in an embodiment of the present invention;

[0018] Figure 2 is a structural diagram of the exhaust pipe noise attenuation amount evaluation device in an embodiment of the present invention;

[0019] Figure 3 is a schematic diagram of a computer device in an embodiment of the present invention. Detailed Embodiments

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the protection scope of the present invention.

[0021] In one embodiment, as Figure 1 shown, a method for evaluating the exhaust pipe noise attenuation amount is provided, including the following steps S10 - S30.

[0022] S10. Obtain the first noise attenuation amount from the exhaust pipe to the pressure relief valve.

[0023] Understandably, the first noise attenuation from the exhaust pipe to the pressure relief valve can be calculated by means of simulation. Here, it can be considered that the exhaust noise at the exhaust pipe mainly enters the vehicle interior through the pressure relief valve.

[0024] During the simulation process, the simulation parameters (such as the sound field setting parameters) can be modified to obtain the first noise attenuation under multiple different conditions.

[0025] S20. Obtain the second noise attenuation from the pressure relief valve to a specified position in the vehicle interior.

[0026] Understandably, the second noise attenuation from the pressure relief valve to a specified position in the vehicle interior can be obtained by means of on-vehicle tests. Here, the specified position in the vehicle interior can refer to the area above the rear seats in the vehicle interior, such as the ear position (which can be the left ear or the right ear) of a rear seat passenger (here it can be a simulation model).

[0027] S30. Determine the target noise attenuation from the exhaust pipe to the specified position in the vehicle interior according to the first noise attenuation and the second noise attenuation.

[0028] Understandably, the target noise attenuation can be the sum of the first noise attenuation and the second noise attenuation. The target noise attenuation is the noise attenuation from the exhaust pipe to the specified position in the vehicle interior.

[0029] In this embodiment, by calculating the first noise attenuation, the attenuation of the noise emitted from the exhaust pipe area (different-shaped parts will generate different noises) to the pressure relief valve can be determined. There is no need to manufacture test samples, which reduces manpower and material resources and shortens the iterative verification time for noise optimization. Then, the second noise attenuation is measured in a real semi-anechoic chamber, and finally the two noise attenuations are superimposed to obtain the target noise attenuation from the exhaust pipe area to the vehicle interior, greatly reducing the vehicle test time.

[0030] Optionally, step S10, that is, obtaining the first noise attenuation from the exhaust pipe to the pressure relief valve, includes:

[0031] S101. Load the vehicle structure model in the simulation environment and load the sound field setting parameters; the vehicle structure model includes the exhaust pipe and the pressure relief valve;

[0032] S102. Set a first noise source at the exhaust pipe and obtain the first noise source volume value;

[0033] S103. Set a receiving point at the pressure relief valve and obtain the first received noise volume value;

[0034] S104. Determine the first noise attenuation according to the first noise source volume value and the first received noise volume value.

[0035] Understandably, a simulation environment can be constructed through finite element acoustic simulation software (such as COMSOL Multiphysics, Virtual Lab, etc.), and then the vehicle structure model is loaded into the simulation environment. The vehicle structure model is an assembly model of the vehicle. The acoustic domain setting parameters include the acoustic properties and boundary conditions of each component in the vehicle structure model, as well as the calculation domain and related setting parameters of the acoustic calculation model. The components in the vehicle structure model include but are not limited to the rear bumper, body sheet metal, etc. The acoustic property can refer to the material acoustic characteristics of the component. In the calculation model, the calculation domain can be divided into tetrahedral meshes, and mesh stretching can be set for the fully absorbing domain to form a fully absorbing boundary layer, simulating the vehicle in an anechoic chamber environment to fit the actual measurement environment. In one example, the average element quality of the mesh needs to be greater than a threshold value, and the threshold value can be set according to actual needs, such as it can be 0.65.

[0036] A first noise source (simulated sound source) can be set at the exhaust pipe, and the volume value of the first noise source (simulation setting value) is obtained. Here, the frequency range of the first noise source can be set to 600 Hz to 5000 Hz; the volume value of the first noise source is expressed in sound pressure level and denoted as SPL s 。

[0037] Receiving points can be set on the outer surface of the pressure relief valve, and the number of receiving points can be one or more. Using the above calculation model, the noise received at each receiving point can be simulated and calculated to generate the noise volume value of each receiving point. If the number of receiving points is one, the first received noise volume value is the noise volume value of this receiving point. If the number of receiving points is multiple, the first received noise volume value is the average value or weighted value of the noise volume values of each receiving point. The first received noise volume value is expressed in sound pressure level and denoted as SPL V1 。

[0038] The first noise attenuation amount can be the difference between the volume value of the first noise source and the first received noise volume value, that is, SPL s -SPL V1 。

[0039] In this embodiment, the first noise attenuation amount is calculated through simulation, and the influence of each component in the exhaust pipe area on the size of the airflow sound can be clarified.

[0040] Optionally, when the vehicle structure model adopts a symmetric double-sided exhaust pipe, if the vehicle model is a hatchback or sedan, the vehicle structure model adopts a 1 / 6 full vehicle model; if the vehicle model is an MPV (multi-purpose vehicle), the vehicle structure model adopts a 1 / 8 full vehicle model;

[0041] When the single exhaust pipe is adopted in the vehicle structure model, if the vehicle model is a hatchback or a sedan, the 1 / 3 full vehicle model is adopted for the vehicle structure model; if the vehicle model is an MPV, the 1 / 4 full vehicle model is adopted for the vehicle structure model.

[0042] Here, for different numbers of exhaust pipes and different vehicle models, different full vehicle models can be selected to meet the data processing requirements of the calculation model.

[0043] Optionally, step S103, that is, setting a receiving point at the pressure relief valve and obtaining the first received noise volume value, includes:

[0044] S1031. Processing the first noise source volume value through a pre-configured grid calculation model to generate the first received noise volume value;

[0045] Among them, the minimum size of the pre-configured grid is not greater than Among them, c is the speed of sound, and λ is the wavelength of the first noise source volume value.

[0046] Understandably, in order to ensure the accuracy of the first received noise volume value, the minimum size of the pre-configured grid c is the speed of sound, and λ is the wavelength of the first noise source volume value. The minimum size here is set based on experience. The calculation model can be an acoustic calculation model customized by simulation software.

[0047] In this embodiment, by adjusting the size of the grid, different absorption environments can be simulated to obtain the corresponding first received noise volume value.

[0048] Optionally, step S20, that is, obtaining the second noise attenuation amount from the pressure relief valve to a specified position in the vehicle, includes:

[0049] S201. Setting a second noise source at the specified position in the vehicle and obtaining the second noise source volume value;

[0050] S202. Setting a microphone at the pressure relief valve and obtaining the second received noise volume value;

[0051] S203. Determining the second noise attenuation amount according to the second noise source volume value and the second received noise volume value.

[0052] Understandably, based on acoustic reciprocity, a second noise source (physical sound source) can be set at a specified position in the vehicle, and a microphone can be set at the pressure relief valve, so as to obtain the noise attenuation value from the specified position in the vehicle to the pressure relief valve, and this value is equal to the second noise attenuation amount from the pressure relief valve to the specified position in the vehicle.

[0053] Specifically, the specified position inside the vehicle may refer to the ear position of the rear seat passengers, that is, the area above the rear seat, and a certain deviation is allowed. The second noise source may be an excitation sound source and is an omnidirectional sound source. The excitation sound source here is preferably a white noise source, and the frequency range includes 600 Hz to 5000 Hz. A noise source microphone may be arranged near the second noise source to collect the volume value of the second noise source. The volume value of the second noise source can be expressed by sound pressure level and is denoted as SPL i .

[0054] A microphone may be arranged on the outer surface of the pressure relief valve to collect the volume value of the second received noise. The distance between the microphone and the pressure relief valve can be determined according to the gap between the rear bumper and the body sheet metal. The volume value of the second received noise can be expressed by sound pressure level and is denoted as SPL V2 .

[0055] The first noise attenuation amount may be the difference between the volume value of the first noise source and the volume value of the first received noise, that is, SPL i -SPL V1 .

[0056] The target noise attenuation amount is the sum of the first noise attenuation amount and the second noise attenuation amount. Therefore, the target noise attenuation amount NR = (SPL s -SPL V1 ) + (SPL i -SPL V1 ).

[0057] It should be understood that the magnitudes of the sequence numbers of the steps in the above embodiments do not mean the order of execution. The order of execution of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0058] In one embodiment, an exhaust pipe noise attenuation amount evaluation device is provided. The exhaust pipe noise attenuation amount evaluation device corresponds one-to-one to the exhaust pipe noise attenuation amount evaluation method in the above embodiment. As Figure 2 shown, the exhaust pipe noise attenuation amount evaluation device includes a first attenuation amount determination module 10, a second attenuation amount determination module 20, and a target attenuation amount determination module 30. The detailed descriptions of each functional module are as follows:

[0059] The first attenuation amount determination module 10 is configured to obtain the first noise attenuation amount from the exhaust pipe to the pressure relief valve;

[0060] The second attenuation amount determination module 20 is configured to obtain the second noise attenuation amount from the pressure relief valve to the specified position inside the vehicle;

[0061] The target attenuation amount determination module 30 is configured to determine the target noise attenuation amount from the exhaust pipe to the specified position inside the vehicle according to the first noise attenuation amount and the second noise attenuation amount.

[0062] Optionally, the first attenuation amount determination module 10 includes:

[0063] A loading unit, configured to load an automotive structure model and acoustic domain setting parameters in a simulation environment; the automotive structure model includes the exhaust pipe and the pressure relief valve;

[0064] A first noise volume acquisition unit, configured to set a first noise source in the exhaust pipe and acquire a first noise source volume value;

[0065] A first received noise volume unit, configured to set a receiving point at the pressure relief valve and acquire a first received noise volume value;

[0066] A first attenuation amount determination unit, configured to determine the first noise attenuation amount according to the first noise source volume value and the first received noise volume value.

[0067] Optionally, when the automotive structure model adopts a symmetric bilateral exhaust pipe, if the vehicle type is a hatchback or a sedan, the automotive structure model adopts a 1 / 6 full vehicle model; if the vehicle type is an MPV, the automotive structure model adopts a 1 / 8 full vehicle model;

[0068] When the automotive structure model adopts a single exhaust pipe, if the vehicle type is a hatchback or a sedan, the automotive structure model adopts a 1 / 3 full vehicle model; if the vehicle type is an MPV, the automotive structure model adopts a 1 / 4 full vehicle model.

[0069] Optionally, the frequency range of the first noise source includes 600 Hz to 5000 Hz; the first noise source volume value is represented by sound pressure level.

[0070] Optionally, the first received noise volume unit includes:

[0071] A model calculation unit, configured to process the first noise source volume value through a pre-configured grid calculation model to generate the first received noise volume value;

[0072] wherein, the minimum size of the pre-configured grid is not greater than where c is the speed of sound and λ is the wavelength of the first noise source volume value.

[0073] Optionally, the second attenuation amount determination module 20 includes:

[0074] A second noise volume acquisition unit, configured to set a second noise source at a specified position inside the vehicle and acquire a second noise source volume value;

[0075] A second received noise volume unit, configured to set a microphone at the pressure relief valve and acquire a second received noise volume value;

[0076] A second attenuation unit is determined to determine the second noise attenuation according to the second noise source volume value and the second received noise volume value.

[0077] Optionally, the second noise source is an excitation sound source, and the frequency range includes 600 Hz to 5000 Hz; the first noise source volume value is expressed in sound pressure level;

[0078] The second received noise volume value is expressed in sound pressure level;

[0079] The specified position inside the vehicle includes the area above the rear seats inside the vehicle.

[0080] For the specific limitations of the exhaust pipe noise attenuation evaluation device, reference can be made to the limitations of the exhaust pipe noise attenuation evaluation method in the above text, which will not be elaborated here. Each module in the above exhaust pipe noise attenuation evaluation device can be implemented in whole or in part by software, hardware and their combination. Each of the above modules can be embedded in or independent of the processor in the computer device in the form of hardware, or stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to each of the above modules.

[0081] In one embodiment, a computer device is provided. The computer device can be a server, and its internal structure diagram can be as Figure 3 shown. The computer device includes a processor, a memory, a network interface and a database connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a readable storage medium and an internal memory. The readable storage medium stores an operating system, computer-readable instructions and a database. The internal memory provides an environment for the operation of the operating system and computer-readable instructions in the readable storage medium. The database of the computer device is used to store the data involved in the exhaust pipe noise attenuation evaluation method. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer-readable instructions are executed by the processor, an exhaust pipe noise attenuation evaluation method is implemented. The readable storage medium provided in this embodiment includes a non-volatile readable storage medium and a volatile readable storage medium.

[0082] In one embodiment, a computer device is provided, including a memory, a processor, and computer-readable instructions stored on the memory and executable on the processor. When the processor executes the computer-readable instructions, the following steps are implemented:

[0083] Obtain the first noise attenuation from the exhaust pipe to the pressure relief valve;

[0084] Obtain the second noise attenuation from the pressure relief valve to the specified position inside the vehicle;

[0085] Determine the target noise attenuation amount from the exhaust pipe to the specified position inside the vehicle according to the first noise attenuation amount and the second noise attenuation amount.

[0086] In one embodiment, one or more computer-readable storage media storing computer-readable instructions are provided. The readable storage media provided in this embodiment includes non-volatile readable storage media and volatile readable storage media. Computer-readable instructions are stored on the readable storage media, and when the computer-readable instructions are executed by one or more processors, the following steps are implemented:

[0087] Obtain the first noise attenuation amount from the exhaust pipe to the pressure relief valve;

[0088] Obtain the second noise attenuation amount from the pressure relief valve to the specified position inside the vehicle;

[0089] Determine the target noise attenuation amount from the exhaust pipe to the specified position inside the vehicle according to the first noise attenuation amount and the second noise attenuation amount.

[0090] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through computer-readable instructions. The computer-readable instructions can be stored in a non-volatile readable storage medium or a volatile readable storage medium. When the computer-readable instructions are executed, they can include the processes of the embodiments of the above methods. Among them, any reference to a memory, storage, database, or other medium used in the various embodiments provided in this application can include non-volatile and / or volatile memories. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or an external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0091] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional units and modules according to needs, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above.

[0092] The above-described embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A method for evaluating the noise attenuation amount of an exhaust pipe, characterized in that, Including: Obtaining a first noise attenuation amount from the exhaust pipe to the pressure relief valve; Obtaining a second noise attenuation amount from the pressure relief valve to a specified position inside the vehicle through a physical sound source; Determining a target noise attenuation amount from the exhaust pipe to the specified position inside the vehicle according to the first noise attenuation amount and the second noise attenuation amount; The obtaining of the first noise attenuation amount from the exhaust pipe to the pressure relief valve includes: Loading an automotive structure model in a simulation environment and loading acoustic domain setting parameters; the automotive structure model includes the exhaust pipe and the pressure relief valve; Setting a first noise source at the exhaust pipe and obtaining a first noise source volume value; Setting a receiving point at the pressure relief valve and obtaining a first received noise volume value; Determining the first noise attenuation amount according to the first noise source volume value and the first received noise volume value.

2. The exhaust pipe noise attenuation amount evaluation method according to claim 1, characterized in that When the automotive structure model adopts symmetric bilateral exhaust pipes, if the vehicle type is a hatchback or a sedan, the automotive structure model adopts a 1 / 6 full vehicle model; if the vehicle type is an MPV, the automotive structure model adopts a 1 / 8 full vehicle model; When the automotive structure model adopts a single exhaust pipe, if the vehicle type is a hatchback or a sedan, the automotive structure model adopts a 1 / 3 full vehicle model; if the vehicle type is an MPV, the automotive structure model adopts a 1 / 4 full vehicle model.

3. The exhaust pipe noise attenuation amount evaluation method according to claim 1, characterized in that The frequency range of the first noise source includes 600 Hz to 5000 Hz; the first noise source volume value is represented by sound pressure level.

4. The exhaust pipe noise attenuation amount evaluation method according to claim 1, wherein The setting a receiving point at the pressure relief valve and obtaining a first received noise volume value includes: Processing the first noise source volume value through a pre-configured grid calculation model to generate the first received noise volume value; Among them, the minimum size of the pre-configured grid is not greater than , where c is the speed of sound, λ is the wavelength of the first noise source volume value.

5. The exhaust pipe noise attenuation amount evaluation method according to claim 1, characterized in that The obtaining of the second noise attenuation amount from the pressure relief valve to the specified position inside the vehicle includes: Setting a second noise source at the specified position inside the vehicle and obtaining a second noise source volume value; Setting a microphone at the pressure relief valve and obtaining a second received noise volume value; Determining the second noise attenuation amount according to the second noise source volume value and the second received noise volume value.

6. The exhaust pipe noise attenuation amount evaluation method according to claim 5, wherein The second noise source is an excitation sound source, and the frequency range includes 600 Hz to 5000 Hz; the first noise source volume value is represented by sound pressure level; The second received noise volume value is represented by sound pressure level; The specified position inside the vehicle includes the area above the rear seat inside the vehicle.

7. An exhaust pipe noise attenuation amount evaluation device, characterized in that, Including: A first attenuation amount determination module for obtaining a first noise attenuation amount from the exhaust pipe to the pressure relief valve; A second attenuation amount determination module for obtaining a second noise attenuation amount from the pressure relief valve to the specified position inside the vehicle through a physical sound source; A target attenuation amount determination module for determining a target noise attenuation amount from the exhaust pipe to the specified position inside the vehicle according to the first noise attenuation amount and the second noise attenuation amount; The first attenuation amount determination module includes: A loading unit for loading an automotive structure model in a simulation environment and loading acoustic domain setting parameters; the automotive structure model includes the exhaust pipe and the pressure relief valve; A first noise volume obtaining unit for setting a first noise source at the exhaust pipe and obtaining a first noise source volume value; The first received noise volume unit is used to set a receiving point for the pressure relief valve and obtain a first received noise volume value; The first attenuation amount determination unit is used to determine the first noise attenuation amount according to the first noise source volume value and the first received noise volume value.

8. A computer device, comprising a memory, a processor, and computer-readable instructions stored in the memory and executable on the processor, characterized in that, When the processor executes the computer-readable instructions, it implements the exhaust pipe noise attenuation amount evaluation method according to any one of claims 1 to 6.

9. One or more readable storage media storing computer-readable instructions, which, when executed by one or more processors, cause the one or more processors to execute the exhaust pipe noise attenuation amount evaluation method according to any one of claims 1 to 6.

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