Noise Optimization Method, Device and Electronic Equipment Based on Vehicle Exhaust System

Abstract

The present invention discloses a noise optimization method, device and electronic equipment based on a vehicle exhaust system. By adjusting the coverage area of the sound insulation material in a specific area of the muffler in the exhaust system and correspondingly correcting the distribution of the engine frequency and the damping excitation coverage, the effect of the exhaust system noise on the sound quality inside the vehicle is improved. Specifically, the optimization of the sound insulation material coverage at the muffler can minimize the unknown impact on the performance of the vehicle. Therefore, it is first proposed to select a reasonable exhaust damping material, which is one of the main ways to control noise, and then associate the engine speed with the noise volume, dynamically optimize the damping coverage of the corresponding material, and correct the distribution of the engine frequency and the damping excitation frequency. The present invention optimizes the design of the muffler-related components in the exhaust system in combination with the engine frequency, which can achieve the purpose of optimizing the sound quality of the vehicle exhaust noise and take into account the economy and power of the vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle noise reduction, and in particular to a noise optimization method, device and electronic equipment based on a vehicle exhaust system. Background Art

[0002] In recent years, with the rapid development of automotive technology, consumer demands for vehicle performance have expanded beyond handling and safety to include comfort and acoustic properties. Consequently, exhaust noise has become a key performance indicator. Numerous studies have been conducted domestically and internationally on noise quality, including experiments using grouped paired comparisons to conduct subjective preference evaluations of in-car noise samples. Others have proposed a subjective fuzzy comprehensive evaluation method for sound quality based on semantic segmentation, which accurately derives the hierarchical relationships between the perceptual attributes of sound samples and prioritizes the overall subjective evaluation scores of sound samples.

[0003] The main sources of noise in a car's exhaust system are noise at the exhaust pipe outlet, radiated noise from the exhaust muffler, and noise generated by exhaust vibrations excitering the body panels, which contribute significantly to interior noise. The exhaust system consists of an exhaust manifold, a catalyst, a particulate collector, an exhaust vibration decoupling device, a front muffler, a rear muffler, an exhaust tailpipe, an intermediate connecting pipe, a decorative cover, a hook, and rubber lugs. The exhaust system's primary function is to convert harmful engine exhaust gases into harmless gases through the catalyst and discharge them away from the cabin air intake, thereby reducing engine exhaust noise. Most existing solutions for reducing system airflow noise focus on optimizing airflow noise. For example, while ensuring the fatigue durability of the lugs, they aim to improve the vibration performance of the exhaust system. A multi-objective optimization design approach is employed, where the weight coefficient of the function consisting of the sum of the transmission forces and the standard deviation of the transmission forces of each lug is greater than the weight coefficient of the function consisting of the sum of the static deformations and the standard deviation of the preload forces of each lug. On the premise that the fatigue durability of the lifting lug meets the enterprise requirements, the durability of the lifting lug is slightly sacrificed, and the noise performance of the system is slightly improved, but there are still many shortcomings.

[0004] Through actual application, it was found that the existing solutions did not meet expectations in terms of optimizing various engine data and adapting to the external environment. There are also great unknowns in the impact of blindly adding sound insulation materials on vehicle performance. In addition, optimizing by modifying the frequency of the air inlet and outlet or adding one-way exhaust three-way catalysts increases the burden on car companies and is not conducive to the environmental problem of complete combustion of automobile fuel over time. Summary of the Invention

[0005] In view of the above, the present invention aims to provide a noise optimization method, device and electronic device based on a vehicle exhaust system to solve the problem that it is difficult to reliably optimize the noise of the vehicle exhaust system.

[0006] The technical solution adopted in the present invention is as follows:

[0007] In a first aspect, the present invention provides a noise optimization method based on a vehicle exhaust system, comprising:

[0008] The damping plate of the muffler is pre-set to be made of a first material and a second material;

[0009] Dynamically adjust the coverage area of the damping plate of the corresponding material according to the current engine speed and the corresponding noise volume;

[0010] The distribution of the damping excitation frequency and the engine frequency is adjusted in response to the adjustment of the damping plate.

[0011] In at least one possible implementation, the dynamically adjusting the coverage area of the damping plate of the corresponding material includes:

[0012] If the noise volume starts to rise from the preset first speed of the engine, the coverage area of the first material damping plate is dynamically adjusted during the speed increase: the coverage is extended from the initial coverage area until full coverage is achieved when the engine speed reaches the preset second speed.

[0013] In at least one possible implementation manner, the dynamically adjusting the coverage area of the damping plate of the corresponding material further includes:

[0014] If the noise volume starts to increase from the preset second speed, the coverage area of the second material damping plate is dynamically adjusted during the speed increase: from the initial coverage area to a partial target coverage area.

[0015] In at least one possible implementation manner, the dynamically adjusting the coverage area of the damping plate of the corresponding material further includes:

[0016] When the rotation speed decreases, the coverage area of the damping plate made of the second material is gradually reduced until it is lower than a preset second rotation speed, and then the coverage area of the damping plate made of the first material is adjusted.

[0017] In at least one possible implementation manner, adjusting the distribution of the damping excitation frequency and the engine frequency includes: adjusting the modulation frequency of the second-order excitation of the speed ratio engine ignition.

[0018] In at least one possible implementation manner, the first material is a soft or hard layer material, and the second material is a POE material.

[0019] In at least one possible implementation manner, the soft and hard layer materials are fiber prepregs in a damping sandwich composite stiffened panel.

[0020] In a second aspect, the present invention provides a noise optimization device based on a vehicle exhaust system, comprising:

[0021] The damping material setting module is used to pre-set the material of the muffler's damping plate to the first material and the second material:

[0022] The damping thickness adjustment module is used to dynamically adjust the coverage area of the damping plate of the corresponding material according to the current engine speed and the corresponding noise volume;

[0023] The engine frequency adjustment module is used to adjust the distribution of the damping excitation frequency and the engine frequency in response to the adjustment of the damping plate.

[0024] In a third aspect, the present invention provides an electronic device, comprising:

[0025] One or more processors, a memory, and one or more computer programs, wherein the memory may adopt a non-volatile storage medium, wherein the one or more computer programs are stored in the memory, and the one or more computer programs include instructions, and when the instructions are executed by the device, the device performs the method as described in the first aspect or any possible implementation of the first aspect.

[0026] The main idea of the present invention is to improve the impact of exhaust system noise on the sound quality inside the vehicle by adjusting the coverage area of the sound insulation material in a specific area of the muffler in the exhaust system and modifying the distribution of the engine frequency and the damping excitation coverage accordingly. Specifically, optimizing the coverage of the sound insulation material at the muffler can minimize the unknown impact on the performance of the vehicle. Therefore, it is first proposed to select a reasonable exhaust damping material, which is one of the main ways to control noise. Then, the engine speed and noise volume are correlated, the damping coverage of the corresponding material is dynamically optimized, and the distribution of the engine frequency and the damping excitation frequency is modified. The present invention optimizes the design of the muffler-related components in the exhaust system in combination with the engine frequency, which can achieve the purpose of optimizing the sound quality of the vehicle's exhaust noise while taking into account the vehicle's economy and power. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described below with reference to the accompanying drawings, in which:

[0028] Figure 1 A flowchart of an embodiment of a noise optimization method based on a vehicle exhaust system provided by the present invention;

[0029] Figure 2 A schematic diagram of an embodiment of a noise optimization device based on a vehicle exhaust system provided by the present invention;

[0030] Figure 3 A schematic diagram of an embodiment of an electronic device provided by the present invention. DETAILED DESCRIPTION

[0031] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0032] Before describing the specific implementation method, the present invention conducts the following analysis on the noise reduction process of the exhaust system airflow noise:

[0033] CFD simulation analysis of the muffler revealed a significant jet phenomenon at the insertion outlet, with a maximum Mach number reaching 0.472. According to aeroacoustic theory, when a jet phenomenon occurs, the ejected airflow has extremely high velocity and its internal static pressure is lower than that of the surrounding stationary gas. This creates a strong scattering effect around the high-speed airflow, drawing a large amount of gas within a certain distance along the direction of the airflow's ejection. As a result, the volume of the jet flow increases and its velocity gradually decreases. However, a small stream of high-speed air remains near the nozzle, maintaining the velocity of the airflow at the nozzle. This stream is often referred to as the potential core of the jet. Around the potential core, the high-speed airflow and the inhaled gas mix vigorously. Within this region, the velocity gradient from the potential core to the mixing boundary is large, complex and variable stresses exist within the airflow, the vortex intensity is high, and the pressure and velocity at various points within the airflow vary rapidly, resulting in strong noise radiation. According to jet noise theory, the acoustic power of the radiated noise is w = KSPV3 / 2C5 = KM5Spv3 / 2 (S = nozzle cross-sectional area, p = medium density, v = jet velocity, c = speed of sound in the medium, M = Mach number, M = v / c, K = a proportionality constant related to gas density and temperature, and Spv3 / 2 = the mechanical power of the jet). The radiation efficiency of jet noise is calculated as follows: acoustic power / mechanical power = KM5. The radiation efficiency of jet noise is proportional to the fifth power of the Mach number. The Mach number of the jet at the choke point in the muffler reaches 0.472. The radiated acoustic power far exceeds the secondary noise of the airflow within the pipe, making it the primary noise source.

[0034] Based on the above analysis, the present invention proposes at least one embodiment of the noise optimization method based on the vehicle exhaust system as follows: Figure 1 Specifically, it may include:

[0035] Step S1, presetting the material of the damping plate (sound insulation pad) of the muffler to a first material and a second material;

[0036] Specifically, the first material is a soft and hard layer material (the soft and hard layer material here may specifically refer to a fiber prepreg in a damping sandwich composite stiffened panel), and the second material is a POE material.

[0037] Step S2: dynamically adjusting the coverage area of the damping plate of the corresponding material according to the current engine speed and the corresponding noise volume;

[0038] Specifically, if the noise volume starts to rise from the preset first speed of the engine (such as 3200rpm), the coverage area of the damping plate of the first material (soft and hard layer material) is dynamically adjusted during the speed increase: the coverage is extended from the initial coverage area (such as 10%) until the engine speed reaches the preset second speed (such as 4000rpm), reaching full coverage (100%).

[0039] Furthermore, if the noise volume starts to rise from the preset second speed, the coverage area of the second material (POE material) damping plate is dynamically adjusted during the speed increase: from the initial coverage area (such as 10%) to a partial target coverage area (preferably close to full, such as 90%); based on this, when the speed decreases, the coverage area of the second material damping plate is gradually reduced until it is lower than the preset second speed, and then it is switched to adjusting the coverage area of the first material damping plate.

[0040] The modification of the aforementioned coverage area may refer to adjusting the thickness of the damping plate at the muffler. For example, in actual operation, through the dynamic adjustment mechanism provided by the aforementioned embodiment, the thickness of the modal damping plate in the preset weak area of the muffler can be increased from 2MM to 6MM (after actual vehicle testing, the thickness adjustment result has a significant effect on reducing the second-order noise with a modal frequency of 94Hz, a modal damping of 4.23%, a 3rd gear working condition, and a speed range of 3200-4000rpm, and the roar in the muffler is significantly weakened).

[0041] It should be noted that the above-mentioned embodiment affects the vibration frequency generated at different engine speeds through the coverage area (thickness) of the damping material. As the thickness of the damping material increases, on the one hand, the sound insulation will increase accordingly, while on the other hand, the sound insulation rate of the damping plate will also decrease. That is, when the damping coverage area (thickness) is simply adjusted to a certain value, the sound insulation effect of the damping plate will be weakened. Therefore, in the above-mentioned embodiment, the present invention proposes to combine the speed changes of the vehicle transmission process and select appropriate damping materials and damping thicknesses, so as to avoid the problem of simply adjusting the damping thickness, thereby achieving the dual requirements of lightweight and low noise for the dynamic adjustment system.

[0042] Step S3: adjusting the distribution of the damping excitation frequency and the engine frequency in response to the adjustment of the damping plate.

[0043] Currently, automotive transmission system design primarily relies on the engine's power characteristic curve, maximum and minimum transmission ratios to design the speed ratios and final drive ratios for each gear in the transmission. Vehicle power and economy are then calculated for different matching parameters, and the system parameters are then determined based on a comprehensive consideration of various factors. The choice of transmission ratio significantly impacts both power and economy, and previous research on powertrain matching has focused primarily on these two factors, with less consideration given to NVH performance.

[0044] After adjusting the damping plate coverage area as mentioned above, if the damping excitation frequency and the engine frequency are improperly distributed, it is easy to cause modulation of the engine ignition second-order excitation. Therefore, in order to avoid obvious beat frequency phenomenon perceived by the human body, the vehicle's main excitation frequency should usually be avoided above 10Hz.

[0045] For example, the modulation frequency of the second-order excitation and damping excitation for the original speed ratio engine ignition is n / 60*3.795x8-n / 30=0.0018n. When the engine speed is in the range of 3200-3300 rpm, the modulation frequency is approximately 6Hz, close to the sensitive modulation frequency (4Hz), which can cause irritating beat frequency sound to the human ear. Therefore, the modulation frequency of the second-order excitation for the adjusted speed ratio engine ignition is n / 60*3.546x8-n / 30=0.00427n. In this way, when the engine speed is 2344rpm, the modulation frequency is 10Hz, and when the engine speed is 3300rpm, the modulation frequency is 13.7Hz. It can be seen that in the commonly used higher speed range of approximately 2300rpm-3300rpm, after adjustment, the main excitation frequency (damping excitation and engine excitation) can be avoided above 10Hz. For example, when the damping excitation is 115Hz, the engine speed is 3058r / min. At this time, the second-order noise of the engine is not obvious, the excitation is small, and the beat frequency noise is not easy to feel subjectively. In other words, it can be understood that the beat frequency noise is eliminated, and the quality of the sound environment in the car is significantly improved, which is conducive to related operations such as voice interaction in the car and improves driving comfort.

[0046] In summary, by adjusting the coverage area of the sound insulation material in a specific area of the muffler in the exhaust system and modifying the distribution of the engine frequency and the damping excitation coverage accordingly, the effect of the exhaust system noise on the sound quality inside the vehicle can be improved. Specifically, optimizing the coverage of the sound insulation material at the muffler can minimize the unknown impact on the performance of the vehicle. Therefore, it is first proposed to select a reasonable exhaust damping material, which is one of the main ways to control noise, and then associate the engine speed with the noise volume, dynamically optimize the damping coverage of the corresponding material, and modify the distribution of the engine frequency and the damping excitation frequency. The present invention optimizes the design of the muffler-related components in the exhaust system in combination with the engine frequency, which can achieve the purpose of optimizing the sound quality of the vehicle's exhaust noise, while taking into account the vehicle's economy and power.

[0047] Corresponding to the above embodiments and preferred solutions, the present invention also provides an embodiment of a noise optimization device based on a vehicle exhaust system, such as Figure 2 As shown, it may specifically include the following components:

[0048] A damping material setting module 1 is used to pre-set the material of the damping plate of the muffler to a first material and a second material;

[0049] Damping thickness adjustment module 2, used to dynamically adjust the coverage area of the damping plate of the corresponding material according to the current engine speed and the corresponding noise volume;

[0050] The engine frequency adjustment module 3 is used to adjust the distribution of the damping excitation frequency and the engine frequency in response to the adjustment of the damping plate.

[0051] It should be understood that the above Figure 2 The division of components in the vehicle exhaust system-based noise optimization device shown is merely a division of logical functions. In actual implementation, they can be fully or partially integrated into a single physical entity, or physically separated. Furthermore, these components can be implemented entirely as software called through a processing element, or entirely as hardware. Alternatively, some components can be implemented as software called through a processing element, while others can be implemented as hardware. For example, one of the aforementioned modules can be a standalone processing element, or it can be integrated into a chip in an electronic device. The implementation of other components is similar. Furthermore, these components can be fully or partially integrated together, or implemented independently. During implementation, each step of the above method or each of the above components can be completed by hardware integrated logic circuits in a processor element, or by software instructions.

[0052] For example, the above components may be one or more integrated circuits configured to implement the above methods, such as one or more application-specific integrated circuits (ASICs), one or more digital signal processors (DSPs), or one or more field programmable gate arrays (FPGAs). For another example, these components may be integrated together to form a system-on-a-chip (SOC).

[0053] Based on the above embodiments and their preferred solutions, those skilled in the art will appreciate that, in actual operation, the technical concepts involved in the present invention can be applied to a variety of implementations. The present invention uses the following carriers as schematic illustrations:

[0054] (1) An electronic device. The device may specifically include: one or more processors, a memory, and one or more computer programs, wherein the one or more computer programs are stored in the memory, and the one or more computer programs include instructions. When the instructions are executed by the device, the device performs the steps / functions of the aforementioned embodiment or an equivalent embodiment.

[0055] The electronic device may specifically be an electronic device related to a computer, such as but not limited to various interactive terminals and electronic products, mobile terminals, etc., especially a computing device that can implement test simulation and modal design.

[0056] Figure 3 This is a schematic structural diagram of an embodiment of an electronic device provided by the present invention. Specifically, the electronic device 900 includes a processor 910 and a memory 930. The processor 910 and the memory 930 can communicate with each other through an internal connection path to transmit control and / or data signals. The memory 930 is used to store computer programs, and the processor 910 is used to call and run the computer program from the memory 930. The above-mentioned processor 910 and the memory 930 can be combined into a processing device, or more commonly, they are independent components. The processor 910 is used to execute the program code stored in the memory 930 to implement the above-mentioned functions. In specific implementation, the memory 930 can also be integrated into the processor 910, or be independent of the processor 910.

[0057] In addition, to further improve the functionality of the electronic device 900, the device 900 may further include one or more of an input unit 960, a display unit 970, an audio circuit 980, a camera 990, and a sensor 901. The audio circuit may further include a speaker 982, a microphone 984, etc. The display unit 970 may include a display screen.

[0058] Furthermore, the device 900 may further include a power supply 950 for providing electrical energy to various devices or circuits in the device 900 .

[0059] It should be understood that the operation and / or function of each component in the device 900 can be specifically referred to the description of the embodiments of the method, system, etc. in the above text. To avoid repetition, the detailed description is appropriately omitted here.

[0060] It should be understood that Figure 3 The processor 910 in the electronic device 900 shown can be a system on a chip SOC, which can include a central processing unit (CPU) and can further include other types of processors, such as a graphics processing unit (GPU), etc., which will be described in detail below.

[0061] In summary, the various processors or processing units within the processor 910 can work together to implement the previous method flow, and the corresponding software programs of the various processors or processing units can be stored in the memory 930.

[0062] (2) A computer data storage medium having a computer program or the aforementioned apparatus stored thereon, which, when executed, causes a computer to execute the steps / functions of the aforementioned embodiments or equivalent implementations.

[0063] In the several embodiments provided herein, any function, if implemented as a software functional unit and sold or used as an independent product, may be stored on a computer data storage medium. Based on this understanding, certain technical solutions of the present invention, or portions that contribute to the prior art, or portions of such solutions, may be embodied in the form of software products as described below.

[0064] It should be particularly noted that the storage medium may refer to a server or a similar computer device, that is, the storage device in the server or similar computer device stores the aforementioned computer program or the aforementioned device.

[0065] (3) A computer program product (which may include the above-mentioned apparatus), which, when running on a terminal device, enables the terminal device to execute the noise optimization method based on the vehicle exhaust system of the aforementioned embodiment or an equivalent implementation.

[0066] Through the description of the above implementation methods, it can be seen that those skilled in the art can clearly understand that all or part of the steps in the above implementation method can be implemented by means of software plus the necessary general hardware platform. Based on this understanding, the above computer program product may include but is not limited to an APP.

[0067] Continuing from the above, the aforementioned device / terminal may be a computer device, and the hardware structure of the computer device may further specifically include: at least one processor, at least one communication interface, at least one memory, and at least one communication bus; the processor, communication interface, and memory may all communicate with each other via the communication bus. The processor may be a central processing unit (CPU), a DSP, a microcontroller, or a digital signal processor, and may also include a GPU, an embedded neural network processor (NPU), and an image signal processor (ISP). The processor may also include a specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention. Furthermore, the processor may have the function of operating one or more software programs, which may be stored in a storage medium such as a memory. The aforementioned memory / storage medium may include: non-volatile memory (such as a non-removable disk, a USB flash drive, a mobile hard disk, an optical disk), read-only memory (ROM), random access memory (RAM), and the like.

[0068] In the embodiment of the present invention, "at least one" refers to one or more, and "more" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can be represented by: a, b, c, a and b, a and c, b and c, or a, b and c, where a, b, c can be single or multiple.

[0069] Those skilled in the art will appreciate that the various modules, units, and method steps described in the embodiments disclosed in this specification can be implemented using a combination of electronic hardware, computer software, and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0070] Furthermore, the modules and units described as separate components may or may not be physically separate, i.e., they may be located in one place or distributed across multiple locations, such as nodes in a system network. Part or all of the modules and units may be selected based on actual needs to achieve the objectives of the above-described embodiments. Those skilled in the art can understand and implement the above-described embodiments without inventive effort.

[0071] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings, but the above is only a preferred embodiment of the present invention. It should be noted that the technical features involved in the above embodiments and their preferred modes can be reasonably combined and matched into a variety of equivalent schemes by those skilled in the art without departing from or changing the design ideas and technical effects of the present invention; therefore, the scope of implementation of the present invention is not limited to what is shown in the drawings. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the scope of protection of the present invention.

Claims

1. A noise optimization method based on a vehicle exhaust system, characterized in that: include: The damping plate of the muffler is pre-set to be made of a first material and a second material; Dynamically adjusting the coverage area of the damping panels of the corresponding materials based on the current engine speed and the corresponding noise level, including: if the noise level starts to increase from a preset first engine speed, dynamically adjusting the coverage area of the damping panels of the first material during the speed increase: extending the coverage from the initial coverage area until full coverage is achieved when the engine speed reaches a preset second speed; and if the noise level starts to increase from the preset second speed, dynamically adjusting the coverage area of the damping panels of the second material during the speed increase: adjusting the coverage area from the initial coverage area to a target coverage area that is not the full coverage area. The distribution of the damping excitation frequency and the engine frequency is adjusted in response to the adjustment of the damping plate.

2. The noise optimization method based on the vehicle exhaust system according to claim 1, characterized in that: The dynamically adjusting the coverage area of the damping plate of the corresponding material also includes: When the rotation speed decreases, the coverage area of the damping plate made of the second material is gradually reduced until it is lower than a preset second rotation speed, and then the coverage area of the damping plate made of the first material is adjusted.

3. The noise optimization method based on the vehicle exhaust system according to claim 1, characterized in that: The adjusting of the distribution of the damping excitation frequency and the engine frequency includes: adjusting the modulation frequency of the second-order excitation of the speed ratio engine ignition.

4. The noise optimization method based on a vehicle exhaust system according to any one of claims 1 to 3, characterized in that: The first material is a soft and hard layer material, and the second material is a POE material.

5. The noise optimization method based on the vehicle exhaust system according to claim 4, characterized in that: The soft and hard layer materials are fiber prepregs in a damping sandwich composite material reinforced plate.

6. A noise optimization device based on a vehicle exhaust system, characterized in that: include: A damping material setting module, used to pre-set the material of the damping plate of the muffler to a first material and a second material; A damping thickness adjustment module is configured to dynamically adjust the coverage area of the damping plate of the corresponding material based on the current engine speed and the corresponding noise level, including: if the noise level starts to increase from a preset first engine speed, dynamically adjusting the coverage area of the damping plate of the first material during the speed increase: starting from the initial coverage area and extending the coverage until full coverage is achieved when the engine speed reaches a preset second speed; and if the noise level starts to increase from the preset second speed, dynamically adjusting the coverage area of the damping plate of the second material during the speed increase: adjusting the coverage area from the initial coverage area to a target coverage area that is not the full coverage area. The engine frequency adjustment module is used to adjust the distribution of the damping excitation frequency and the engine frequency in response to the adjustment of the damping plate.

7. An electronic device, characterized in that: include: One or more processors, a memory, and one or more computer programs, wherein the one or more computer programs are stored in the memory, and the one or more computer programs include instructions that, when executed by the electronic device, cause the electronic device to execute the noise optimization method based on the vehicle exhaust system according to any one of claims 1 to 5.

8. A computer data storage medium, characterized in that The computer data storage medium stores a computer program, and when the computer program is run on a computer, the computer is enabled to execute the noise optimization method based on a vehicle exhaust system according to any one of claims 1 to 5.

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