A solution to supercharger noise

Abstract

The present invention provides a method for solving supercharger noise, which includes the following steps: storing each test spectrum feature in a controller; designing multiple noise reduction methods, storing each noise reduction method in the controller, and making each noise reduction method correspond to one or more test spectrum features; collecting the spectrum feature of the supercharger noise on the target vehicle, comparing the spectrum feature with each test spectrum feature, if the spectrum feature matches any one of the test spectrum features, then providing the noise reduction method corresponding to the test spectrum feature that matches the spectrum feature to the developer; the developer rectify the vehicle according to the obtained noise reduction method, make a sample, and then verify the noise reduction effect on the actual vehicle, if the noise reduction effect does not reach the set target, repeat step S3 until the set target is reached. The present invention can make various supercharger noises can obtain better noise reduction effects, and can also improve the efficiency of supercharger noise reduction processing.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle noise reduction, and in particular relates to a solution to supercharger noise. Background Art

[0002] In recent years, with the rapid development of the automobile industry, cars have entered thousands of households. People's requirements for the comfort of cars, especially passenger cars, are gradually increasing. The NVH (Noise, Vibration, Harshness) performance of automobiles is the main indicator that determines the comfort of vehicles, and supercharger noise is an important noise source for supercharged vehicles in urban conditions.

[0003] At present, the common solution to supercharger noise is to design a high-frequency muffler. In this method, a single supercharger noise corresponds to a single muffler. Since there are many types of supercharger noise, not all noises can achieve a good noise reduction effect by designing a muffler. Therefore, how to design a supercharger noise solution to achieve a good noise reduction effect on supercharger noise has become a technical problem that technicians in this field need to solve urgently. Summary of the invention

[0004] The purpose of the present invention is to provide a method for solving supercharger noise problem, so as to solve the above-mentioned technical problems in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A method for solving supercharger noise includes the following steps:

[0007] Step S1, obtaining experimental spectrum characteristics of various supercharger noises through experiments, and storing each experimental spectrum characteristic in a controller;

[0008] Step S2, designing multiple noise reduction methods, storing each noise reduction method in a controller, and making each noise reduction method correspond to one or more test spectrum features;

[0009] Step S3, collecting the frequency spectrum characteristics of the supercharger noise on the target vehicle, comparing the frequency spectrum characteristics with the frequency spectrum characteristics of each test, if the frequency spectrum characteristics match any one of the frequency spectrum characteristics of each test, providing the noise reduction method corresponding to the frequency spectrum characteristics of the test that matches the frequency spectrum characteristics to the developer, and entering step S4;

[0010] Step S4: The developer modifies the vehicle according to the noise reduction method obtained, makes a sample, and then verifies the noise reduction effect on the actual vehicle. If the noise reduction effect reaches the set target, the supercharger noise reduction work is completed; if the noise reduction effect does not reach the set target, repeat step S3 until the noise reduction effect reaches the set target.

[0011] Preferably, the supercharger noise includes Hiss sound, blowby sound, suction sound, synchronous noise, subsynchronous noise and blade passing noise.

[0012] Preferably, the noise reduction method includes a method a for reducing the noise of Hiss sound, suction sound and deflation sound, a method d for reducing the noise of synchronous noise, a method e for reducing the noise of subsynchronous noise, and a method f for reducing the noise of blade passing noise;

[0013] The specific content of method a is: by collecting the problem frequency band of the spectral characteristics of the supercharger noise, the target transmission loss curve of the problem frequency band is obtained, and then the silencer that meets the target transmission loss curve is analyzed and designed using GPpower software;

[0014] The specific contents of method d are: optimizing the dynamic unbalance of the turbine shaft system to reduce the vibration excitation caused by the unbalanced mass;

[0015] The specific content of method e is: optimizing the design tolerance of the shaft and bearing system of the supercharger, or changing the length of the bearing and oil film in the supercharger intermediate body;

[0016] The specific content of method f is: optimizing the blade shape of the supercharger blade or increasing the gap between the blade and the vortex tongue to reduce the blade passing noise.

[0017] Preferably, the noise reduction method also includes method b for reducing the noise of air leakage sound, and the specific content of method b is: improving the direction of the supercharger air leakage pipe so that the air leakage port of the supercharger is arranged away from the air intake port of the intake system.

[0018] Preferably, the noise reduction method further includes method c for reducing the Hiss sound, and the specific content of method c is: adjusting the working curve of the supercharger by calibration to make the working curve of the supercharger away from the surge line.

[0019] Preferably, the noise reduction method also includes method g for reducing Hiss, suction sound, deflation sound, and blade passing noise, and the specific content of method g is: increasing the wall thickness of the intake pipe, or wrapping sound-absorbing or sound-insulating parts outside the intake pipe.

[0020] The beneficial effects of the present invention are:

[0021] The supercharger noise solution of the present invention can identify different supercharger noises and then provide noise reduction methods for different supercharger noises respectively, instead of designing silencers for different supercharger noises as in the prior art, so that various supercharger noises can obtain better noise reduction effects; at the same time, since different supercharger noises can be automatically identified and corresponding noise reduction methods can be provided, the efficiency of the supercharger noise reduction processing can be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the embodiments, and further describe the specific embodiments of the present invention in detail in conjunction with the drawings, wherein

[0023] Figure 1 A flowchart of a method for solving supercharger noise problems provided by an embodiment of the present invention;

[0024] Figure 2 This is a corresponding diagram of the noise reduction method provided in an embodiment of the present invention and various supercharger noises. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution of the present invention, the solution will be further described in detail below in conjunction with specific embodiments.

[0026] like Figure 1 As shown, an embodiment of the present invention provides a method for solving supercharger noise, which includes the following steps:

[0027] Step S1, obtaining experimental spectrum characteristics of various supercharger noises through experiments, and storing each experimental spectrum characteristic in a controller;

[0028] Step S2, designing a plurality of noise reduction methods for reducing the noise of each supercharger, storing each noise reduction method in a controller, and making each noise reduction method correspond to one or more test spectrum features;

[0029] Step S3, collecting the frequency spectrum characteristics of the supercharger noise on the target vehicle, comparing the frequency spectrum characteristics with the frequency spectrum characteristics of each test, if the frequency spectrum characteristics match any one of the frequency spectrum characteristics of each test, providing the noise reduction method corresponding to the frequency spectrum characteristics of the test that matches the frequency spectrum characteristics to the developer, and entering step S4;

[0030] Step S4: The developer modifies the vehicle according to the noise reduction method obtained, makes a sample, and then verifies the noise reduction effect on the actual vehicle. If the noise reduction effect reaches the set target, the supercharger noise reduction work is completed; if the noise reduction effect does not reach the set target, repeat step S3 until the noise reduction effect reaches the set target.

[0031] The supercharger noise solution provided by the embodiment of the present invention can identify different supercharger noises and then provide noise reduction methods for different supercharger noises respectively, instead of designing silencers for different supercharger noises as in the prior art, so that various supercharger noises can obtain better noise reduction effects; at the same time, since different supercharger noises can be automatically identified and then corresponding noise reduction methods can be provided, the efficiency of the supercharger noise reduction processing can be effectively improved.

[0032] In step S3, if the spectral feature does not match any of the test spectral features, it indicates that a new noise problem has occurred, and a new noise reduction method needs to be designed for the new noise problem, and the spectral feature of the new noise is stored in the controller correspondingly with the noise reduction method, so that when the noise problem occurs on the target vehicle, there can be a noise reduction method that matches it, which is convenient for calling out the corresponding noise reduction method and providing it to the developer. In step S3, the spectral feature obtained on the target vehicle is not necessarily exactly the same as the test spectral feature, but can basically be decomposed into spectral features generated by different noise sources, that is, test spectral features of different types of supercharger noise in the controller. According to the energy size of the spectral feature, it is determined whether there is a noise problem corresponding to the spectral feature, and then the noise reduction method corresponding to the test spectral feature matching the spectral feature with larger energy is output to the developer.

[0033] In step S3, when there are multiple noise reduction methods for solving the same supercharger noise, all of the multiple noise reduction methods can be provided to the developer, and the developer can choose which noise reduction method to use based on actual conditions, such as considering the layout space of the sample, whether the same platform model has good usability, cost and other factors.

[0034] Furthermore, the supercharger noise includes Hiss sound, air leakage sound, air intake sound, synchronous noise, subsynchronous noise, and blade BPF noise. It is understandable that the above-mentioned supercharger noises are common supercharger noises in the prior art, and the spectral characteristics of these supercharger noises can be obtained through experiments or through data in the prior art; the noise reduction method for solving these supercharger noises can be obtained based on experience, or the method can be designed and the noise reduction effect of the method can be verified based on the generation mechanism of each supercharger noise, and then each noise reduction method is stored in the controller.

[0035] The generation mechanism of each supercharger noise is as follows:

[0036] The Hiss sound is the critical surge of the supercharger, which causes aerodynamic instability and forms turbulence at the turbine.

[0037] The deflation sound is caused by the supercharger closing when the accelerator pedal is suddenly released, and the airflow released by the pressure relief valve impacts the intake pipe, which produces noise;

[0038] The intake sound is the sound caused by the pulsation of the air column in the intake pipe caused by the increase in supercharger speed when the accelerator pedal is accelerated;

[0039] Synchronous noise is the vibration excitation caused by the dynamic unbalance difference between the impeller and shaft system of the supercharger;

[0040] Subsynchronous noise is the sound produced by the mutual movement between the rotor, bearing and oil film of the supercharger;

[0041] Blade passing noise, also called blade BPF noise, is the passing noise of the supercharger impeller;

[0042] like Figure 2 As shown, the noise reduction method includes method a for reducing the noise of Hiss sound, suction sound and deflation sound, method d for reducing the noise of synchronous noise, method e for reducing the noise of subsynchronous noise, and method f for reducing the noise of blade passing noise;

[0043] The specific content of method a is: by collecting the problem frequency band of the spectral characteristics of the supercharger noise, the target transmission loss curve of the problem frequency band is obtained, and then the GPpower software is used to analyze and design a silencer that meets the target transmission loss curve; it can be understood that the frequency band with larger energy and more prominent color on the spectral characteristic diagram is the problem frequency band; the transmission loss curve is an indicator for evaluating the silencer muffler band and silencer ability. Designing a silencer that meets the transmission loss curve for the problem frequency band is the first step, and sample production and actual vehicle verification are the second step. Generally, if the transmission loss simulation of the silencer sample meets the requirements, there will be no major problems in the actual vehicle verification. If the actual vehicle verification fails to achieve the noise reduction target, it is necessary to return to reset the effective frequency band range or effective frequency band size of the transmission loss, adjust the structure of the silencer, and then produce samples for actual vehicle verification until the noise reduction target is achieved.

[0044] The specific content of method d is: optimize the dynamic unbalance of the turbine shaft system to reduce the vibration excitation of the entire shaft system caused by the unbalanced mass;

[0045] The specific content of method e is: optimizing the design tolerance of the shaft and bearing system of the supercharger, or changing the length of the bearing and oil film in the supercharger intermediate body;

[0046] The specific content of method f is: optimizing the blade shape of the supercharger blade or increasing the gap between the blade and the vortex tongue to reduce the blade passing noise.

[0047] Furthermore, the noise reduction method also includes method b for reducing the noise of air leakage sound, and the specific content of method b is: improving the direction of the supercharger air leakage pipe so that the air leakage port of the supercharger is arranged at an air intake port away from the air intake port of the air intake system.

[0048] Specifically, the noise reduction method also includes method c for reducing the Hiss sound. The specific content of method c is: adjusting the working curve of the supercharger by calibration so that the working curve of the supercharger is far away from the surge line, that is, far away from the boundary of the surge zone.

[0049] Specifically, the noise reduction method also includes method g for reducing Hiss sound, suction sound, deflation sound, and blade passing noise. The specific content of method g is: increasing the wall thickness of the intake pipe, or wrapping sound-absorbing or sound-insulating parts outside the intake pipe.

[0050] When one supercharger noise is solved by using the above-mentioned supercharger noise solution and another supercharger noise emerges again, continue to solve the noise problem according to the above-mentioned steps until the set noise reduction target is achieved.

[0051] It is understandable that storage media, devices, and equipment corresponding to the above methods can be set; the above content and logical relationships can also be solidified and stored in the memory, which can realize the solidification of the process of handling vehicle supercharger noise problems, and new problem items and solutions and corresponding relationships can be added in real time, which greatly saves the efficiency of supercharger noise problem handling, more effectively summarizes experience, and prevents technology loss.

[0052] The above are only preferred embodiments of the present invention. It should be pointed out that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. Moreover, after reading the contents of the present invention, relevant technical personnel in the field may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A method for solving supercharger noise, characterized in that: It includes the following steps: Step S1, obtaining experimental spectrum characteristics of various supercharger noises through experiments, and storing each experimental spectrum characteristic in a controller; Step S2, designing multiple noise reduction methods, storing each noise reduction method in a controller, and making each noise reduction method correspond to one or more test spectrum features; Step S3, collecting the frequency spectrum characteristics of the supercharger noise on the target vehicle, comparing the frequency spectrum characteristics with the frequency spectrum characteristics of each test, if the frequency spectrum characteristics match any one of the frequency spectrum characteristics of each test, providing the noise reduction method corresponding to the frequency spectrum characteristics of the test that matches the frequency spectrum characteristics to the developer, and entering step S4; Step S4: The developer modifies the vehicle according to the noise reduction method obtained, makes a sample, and then verifies the noise reduction effect on the actual vehicle. If the noise reduction effect reaches the set target, the supercharger noise reduction work is completed; if the noise reduction effect does not reach the set target, repeat step S3 until the noise reduction effect reaches the set target.

2. The method for solving supercharger noise according to claim 1, characterized in that: Supercharger noise includes Hiss sound, air leakage sound, intake sound, synchronous noise, subsynchronous noise and blade passing noise.

3. The method for solving the supercharger noise according to claim 2, characterized in that: The noise reduction method includes a method a for reducing the noise of Hiss sound, suction sound and deflation sound, a method d for reducing the noise of synchronous noise, a method e for reducing the noise of subsynchronous noise, and a method f for reducing the noise of blade passing noise; The specific content of method a is: by collecting the problem frequency band of the spectral characteristics of the supercharger noise, the target transmission loss curve of the problem frequency band is obtained, and then the silencer that meets the target transmission loss curve is analyzed and designed using GPpower software; The specific contents of method d are: optimizing the dynamic unbalance of the turbine shaft system to reduce the vibration excitation caused by the unbalanced mass; The specific content of method e is: optimizing the design tolerance of the shaft and bearing system of the supercharger, or changing the length of the bearing and oil film in the supercharger intermediate body; The specific content of method f is: optimizing the blade shape of the supercharger blade or increasing the gap between the blade and the vortex tongue to reduce the blade passing noise.

4. The method for solving the supercharger noise according to claim 3, characterized in that: The noise reduction method also includes method b for reducing the noise of air leakage. The specific content of method b is: improving the direction of the supercharger air leakage pipe so that the air leakage port of the supercharger is arranged at the air intake port away from the air intake port of the air intake system.

5. The method for solving the supercharger noise according to claim 3, characterized in that: The noise reduction method also includes method c for reducing the Hiss sound. The specific content of method c is: adjusting the working curve of the supercharger by calibration so that the working curve of the supercharger is far away from the surge line.

6. The method for solving the supercharger noise according to claim 3, characterized in that: The noise reduction method also includes method g for reducing Hiss, suction sound, deflation sound, and blade passing noise. The specific content of method g is: increasing the wall thickness of the intake pipe, or wrapping sound-absorbing or sound-insulating parts outside the intake pipe.

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