Method for detecting vehicle noise source

Abstract

The invention discloses a method for detecting a vehicle noise source. The method for detecting the vehicle noise source comprises the steps that a vibration signal at a possible excitation source position, a noise signal at the possible radiation source position and a noise signal at a target point are measured under a steady-state working condition of a vehicle, a multi-input single-output modelis established by using a transfer path analysis method, and the number and position of independent radiation sources / excitation sources and the contribution of each radiation source / excitation source are determined. Compared with a traditional experimental analysis method, the operation flow of the vehicle vibration noise source detection is simplified without the need for a transfer function test; the transfer path analysis method based on the working condition test is adopted, the number and position of main noise radiation sources in the environment of serious aliasing noise in the vehicle can be detected, and the contribution amount of each radiation source is determined, so that the method for detecting the vehicle noise source is more practical; and in addition, detection is carried out for the steady-state working condition, operation is simple and convenient, time is saved, and a noise source transfer path can be identified without the need of a decoupled system.

Description

technical field [0001] The invention belongs to the technical field of automobile noise control, and in particular relates to an automobile noise source detection method under operating conditions. Background technique [0002] Automobile noise is the main source of noise pollution. Many countries have enacted strict laws and regulations to control automobile noise. As an important topic in the development of automobile technology today, reducing automobile noise has been recognized by countries around the world and major vehicle manufacturers and parts companies. Widespread attention. [0003] The key to reducing vehicle noise is accurate detection of noise sources. At present, commonly used methods for noise source identification include operation method, lead coverage method, sound intensity measurement method, coherence analysis method and transfer path method, etc. In the operation method, the suspected noise sources are operated independently, and the noise character...

AI Technical Summary

Problems solved by technology

However, if multiple excitation sources have strong coherence, the partial coherence function will be very small, and effective analysis results cannot be obtained

The traditional transfer path analysis method is to identify the source of vibration and noise by decoupling the system and isolating each transfer path, that is, the power system needs to be removed during the test, and then a lot of time is spent to measure the frequency response function of the system

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