摩托车发动机壳体噪声辐射数值分析

Numerical analysis of noise radiation from motorcycle engine shell

采用有限元/边界元法(FEM/BEM),对摩托车发动机壳体进行模态分析,将试验模态与计算模态进行对比,两者的吻合程度较高,表明所建立的有限元模型的正确性;对壳体进行频率响应分析及结构噪声辐射的仿真分析,并对发动机壳体的噪声辐射进行预测,得到其结构外部声场特性,将预测结果与试验结果在各频带下进行对比分析,其吻合程度较高,表明该方法是有效的。

FEM/BEM （Finite Element Method/Boundary Element Method） mode analysis of the noise radiation from motorcycle engine shell is conducted. The natural frequency is compared between FEM/ BEM analysis and experimental analysis. The FEM/BEM results are agreed with the experiment results, which proves that the finite element model is correct. The frequency response is analyzed and the structure＇ s noise radiation is simulated by means of FEM/BEM, in order to predict the noise radiation from the motorcycle engine shell and gain the sound field characteristic outside the structure. The calculation data is compared with the experiment data in different frequency hands. The result shows high accordance, which indicates that this method is effective.