Abstract
Structure-Air noise sources in different frequencies were identified based on analysis of frequency and testing of vibration and noise under idling condition, and a method for signal sources priority was developed under identifying the kinds of noise sources. The partial coherence equations of the six input and single output systems were derived based on the theory of coherence. Coefficient of partial coherence of the test data of vibration and noise in vehicle was calculated by using MATLAB. Coherence analysis results show that working engine incentive transferred to the driving cab in low frequency range caused structure noise, engine RH mounting is the main noise source; The noise in middle frequency range is caused by the coupling effects of vibration of engine left mounting and noise of the engine compartment to the driving cab, between which left hanging mount vibration affected more; Engine compartment noise in high frequency leaked through the air to the cab, engine noise is the main source of noise inside.
Highlights
With development of the international economic, cars ownership increased level year by year
In order to control the noise inside the car effectively, the theories and methods proposed by the researchers for noise source identification can be summarized as the traditional noise source identification method, the analysis methods based on signal processing technology and the sound source recognition method based on visualization technology [2, 3]
In the premise of correcting the priority of the vibration, noise sources, the partial coherence analysis can eliminate the influence of other related inputs [8], which is promising in the practical application of vehicle noise sources identification
Summary
With development of the international economic, cars ownership increased level year by year. In order to control the noise inside the car effectively, the theories and methods proposed by the researchers for noise source identification can be summarized as the traditional noise source identification method, the analysis methods based on signal processing technology and the sound source recognition method based on visualization technology [2, 3]. The traditional noise source identification method and the visualization-based sound source recognition method are widely used in the simple sound source and surface noise recognition [4]. In the premise of correcting the priority of the vibration, noise sources, the partial coherence analysis can eliminate the influence of other related inputs [8], which is promising in the practical application of vehicle noise sources identification. This paper identifies the Structure-Air noise sources based on the analysis of the vibration and noise of the vehicle, classifies the signal source priorities based on the noise source category judgment, and uses the coherence analysis method to accurately identify the noise source that triggers the noise in the vehicle
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