The identification of emission noise source by weighted partial coherence method on an excavator

Considering the original partial coherence method could be only applied to a single-response system, a weighted partial coherence method is proposed to analysis multi-responses systems. This article takes the emission noise of a hydraulic excavator as a test object, accomplishes its emission noise level evaluation and noise source identification. A multi-responses system has been analyzed by a quantifiable exterior noise contribution of multi-field points method, quantifying the contribution of different noise sources and determining the radiator fan as the main source of emission noise. An effective acoustic package solution has been made into practice according to the contribution results. The verifying test confirms that the hydraulic excavator reduces outside noise by 4.23dB (A).