3302 サーバの低騒音化設計のための騒音予測システム(OS4-1 デジタルエンジニアリングI,OS4 デジタルエンジニアリング)

抄録

An acoustic noise prediction system has been developed to reduce acoustic noise of electric equipment such as servers. The system can accurately predict the noise in frequency-domain without an actual prototype by coupling two acoustic simulation methods, which are: (1) a boundary elements method (BEM) for low-frequency prediction, and (2) a combined method of both statistical energy analysis (SEA) and geometrical acoustics for high-frequency prediction. The prediction accuracy in high-frequency has been improved by considering higher-order diffractions of an exterior space. We show that our system predicts acoustic pressure of the equipment precisely enough and leads to a good coincidence with actual measured values.