CN-122016276-A - Method and device for predicting noise of compressor in vehicle and electronic equipment

CN122016276ACN 122016276 ACN122016276 ACN 122016276ACN-122016276-A

Abstract

The application relates to the technical field of noise prediction, and discloses a method and a device for predicting noise of a compressor in a vehicle and electronic equipment, wherein the method comprises the steps of obtaining compressor vibration force and compressor noise data of an electric compressor to be detected under different frequencies; the method comprises the steps of determining system response force of a vibration isolation system under different frequencies according to vibration force of a compressor and natural frequency of the vibration isolation system, determining vehicle body vibration force transmitted to a vehicle body under different frequencies according to system attenuation coefficient and system response force of the vibration isolation system, and determining sound pressure level of compressor noise in a vehicle under different frequencies according to compressor noise data and the vehicle body vibration force. The prediction model based on actual test data is built by acquiring the vibration force of the compressor and the noise data of the compressor of the electric compressor under different frequencies and combining the natural frequency of the vibration isolation system and the system attenuation coefficient, so that the sound pressure level of the noise of the compressor of the electric automobile can be predicted in advance in the research and development stage of the electric automobile.

Inventors

ZHANG CHUNBO
ZHAO QIN
YANG YU
JIA WENYU

Assignees

重庆长安汽车股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260130

Claims (10)

1. A method for predicting compressor noise in a vehicle, comprising: Obtaining compressor vibration force and compressor noise data of an electric compressor to be tested under different frequencies; Determining system response force of the vibration isolation system under different frequencies according to vibration force of the compressor and natural frequency of the vibration isolation system, wherein the vibration isolation system is constructed based on parameters of an electric compressor to be tested and preset vibration isolation elements; according to the system attenuation coefficient and the system response force of the vibration isolation system, determining the vibration force of the vehicle body transmitted to the vehicle body under different frequencies; And determining the sound pressure level of the compressor noise in the vehicle under different frequencies according to the compressor noise data and the vehicle body vibration force.
2. The method of claim 1, wherein obtaining compressor vibration force and compressor noise data for the electric compressor under test at different frequencies comprises: In a sound elimination laboratory environment, controlling an electric compressor to be tested to rotate at different frequencies, and obtaining excitation forces of a plurality of mounting points of the electric compressor to be tested at different frequencies and compressor noise data at a preset distance from the electric compressor to be tested, wherein the electric compressor to be tested is rigidly connected with a plurality of force sensors through the plurality of mounting points; And determining resultant forces of the plurality of exciting forces in x, y and z directions respectively according to exciting forces of the plurality of mounting points at different frequencies so as to obtain vibration forces of the compressor at different frequencies.
3. The method as recited in claim 2, further comprising: after the compressor noise data is obtained, data higher than a preset frequency in the compressor noise data is filtered.
4. The method of claim 1, wherein the natural frequency of the vibration isolation system is determined as follows: Acquiring physical inertia of the electric compressor to be measured, and determining a mass matrix according to the physical inertia and the total mass of the electric compressor to be measured; determining a system stiffness matrix according to the parallel direction stiffness sum, the torsional direction stiffness sum and the cooperative stiffness in the vibration isolation element parameters; And determining the natural frequency of the vibration isolation system according to the mass matrix and the system stiffness matrix.
5. The method of claim 1, wherein determining the system response force of the vibration isolation system at different frequencies based on the compressor vibration force and the natural frequency of the vibration isolation system comprises: according to the vibration frequency and the natural frequency of the vibration isolation system, determining amplitude response coefficients of the vibration isolation system under different frequencies; And determining system response force of the vibration isolation system at different frequencies according to the vibration force and the amplitude response coefficient of the compressor.
6. The method of claim 5, wherein the magnitude response coefficient is determined according to the formula: wherein T M is an amplitude response coefficient, lambda is the ratio of the vibration frequency to the natural frequency of the vibration isolation system, and zeta is the system damping ratio.
7. The method of claim 1, wherein the system attenuation coefficient of the vibration isolation system is determined as follows: Determining vibration isolation amounts at different frequencies; and determining the system attenuation coefficients of the vibration isolation system at different frequencies according to the vibration isolation quantity.
8. The method according to any one of claims 1 to 7, wherein the sound pressure level of the in-vehicle compressor noise is determined according to the following formula: Where y k is the sound pressure level of the in-vehicle compressor noise, NTF ik is the structural sound transfer function, NTF jk is the air sound transfer function, F Ri is the vehicle body vibration force, P j is the compressor noise data, n is the number of structural sound transfer paths, and m is the number of air sound transfer paths.
9. An apparatus for predicting in-vehicle compressor noise comprising a processor and a memory storing program instructions, wherein the processor is configured to perform the method for predicting in-vehicle compressor noise of any one of claims 1 to 8 when executing the program instructions.
10. An electronic device, comprising: An electronic device body; The apparatus for predicting in-vehicle compressor noise of claim 9, mounted to an electronic device body.

Description

Method and device for predicting noise of compressor in vehicle and electronic equipment Technical Field The application relates to the technical field of noise prediction, in particular to a method and a device for predicting noise of a compressor in a vehicle and electronic equipment. Background With the development of new energy automobile industry, the electric compressor has wider application scene. The electric automobile needs to be matched with an electric compressor to realize the whole automobile thermal management control. Different from the traditional internal combustion engine power system in which the compressor is driven by the engine, the electric compressor on the electric automobile is a relatively independent vibration source and noise source, and the problem of noise in the automobile related to the electric compressor becomes a main complaint point of users. According to different transmission paths of vibration noise energy, the noise of the electric compressor in the vehicle can be divided into two contributions of air transmission noise and structural transmission noise. The air transmission noise is the noise which is transmitted to the interior of the vehicle by the radiation noise of the electric compressor body through the attenuation of the sound insulation components of the vehicle body, and the structure transmission noise is the noise which is generated after the vibration force generated by the electric compressor during working is attenuated by vibration isolation elements such as rubber bushings and the like and then transmitted to the vehicle body, and the vehicle body wall plate and the sound cavity in the vehicle act together. In general, noise of an electric compressor is mainly noise caused by mechanical friction and vibration of a rotor and a turntable driven by operation of a driving motor, the corresponding operating noise frequency band range is a low frequency band within 200Hz, and control of noise in a vehicle in the frequency band is closely related to single body selection of the compressor, vibration isolation element design and sound transfer function target setting of a vehicle body structure. Therefore, through the prediction of the noise of the compressor in the vehicle, the proper model of the electric compressor, reasonable rubber vibration isolation elements and accurate sound transfer function targets of the vehicle body structure can be selected in advance in the design stage of the electric vehicle, and the double reduction of the product research and development period and the cost is realized. In the related art, a prediction method of compressor noise is disclosed, which specifically comprises the steps of constructing an acoustic boundary element model of a compressor shell based on a three-dimensional geometric model of the compressor shell, discretizing the geometric model into boundary element units, identifying main noise sources inside and outside the compressor, loading the identified noise sources into the acoustic boundary element model as boundary conditions, setting the acoustic boundary conditions according to the actual working environment and material characteristics of the compressor shell, solving the acoustic boundary element model, calculating the acoustic response of the surface of the compressor shell, and predicting the noise of the compressor shell based on the calculated acoustic response of the surface of the compressor shell. In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art: the related art performs noise prediction by a compressor unit main noise source, but it is difficult to predict the in-vehicle compressor noise level after the compressor is mounted on an electric vehicle. It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the application and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art. Disclosure of Invention The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows. The embodiment of the disclosure provides a method and a device for predicting noise of an in-vehicle compressor and electronic equipment, so as to predict the noise level of the in-vehicle compressor in the development stage of an electric automobile. In some embodiments, the method for predicting in-vehicle compressor noise comprises the steps of obtaining compressor vibration force and compressor noise data of an electric compressor to be detected at different frequencies, determining system respons