実稼動状態における騒音低減のための感度解析(<特集>D&D2009)

概要

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For considering countermeasure of the noise in vehicle cabin, structure-acoustic coupling analysis needs to be conducted. Recently, the operational state analysis is performed and more effective counter measure of the noise is enabled. Conventionally, the input identification under operational condition has been the first step to tackle with the problem. However, it is usually time-consuming and needs a lot of practical skills. Therefore, this paper proposes a new sensitivity analysis for the noise reduction under operational condition without using input identification. The structure modification is investigated based on the operational response, where the mass-added structure modification is considered as an example. The proposed method uses sensitivity analysis and response estimate after the structure change. It is assumed that the external force is in a steady state and is not affected by the structure modification, which enables the structure modification for noise reduction without using input identification. The proposed process is applied to a real structure. It is confirmed that the noise level decreases as it was predicted based on the proposed approach.
2010-05-25