108 多段遠心ポンプのフルスケールモデルによる放射騒音の数値解析(振動・音響の評価技術,騒音・振動改善技術)

概要

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We present a one-way coupled simulation of fluid flow, structural vibration and acoustical radiation analyses that we applied to predict noise radiating from a 5-stage centrifugal pump. A large eddy simulation was performed to compute pressure fluctuations on the internal surface of the pump. The computed fluctuations were then used in a structural analysis that was based on the explicit dynamic finite element method that computed the elastic wave propagating in the solid. The resulting external surface vibration was then used in a acoustical analysis that was based on the boundary element method that used the normal derivative form of the Helmholtz integral equation. The computed internal pressure fluctuations, vibration velocities on the external surface and the radiated sound pressure level of the pump were compared with the measured equivalents, and reasonably good agreement between computed and measured results were obtained. The proposed method thus shows promise as a tool for the prediction and reduction of flow-induced noise generated from hydraulic turbomachinery.
一般社団法人日本機械学会の論文
2005-07-06