基于流固耦合的油底壳辐射噪声研究

Research on Oil Pan Radiative Noise Based on Coupled Fluid-Structure Modal

为研究机油和油底壳之间的相互影响,基于Abaqus建立流固耦合模态分析模型,并通过试验验证了该方法的准确性。结合实测激励进行动态响应分析,得到油底壳表面加速度响应。利用边界元方法,进行油底壳外部声场计算。结合油底壳模态振型进行结构优化,优化后的油底壳总输出声功率级降低了2.6 dB(A)。该方法为油底壳的辐射噪声计算及减振降噪提供指导。

In order to study the interactive impact between oil pan and oil, the coupled modal analysis model was built based on Abaqus with coupled fluid-structure modal, and its accuracy was verified by experiments. The measured excitation was used to make dynamic response analysis for calculating oil pan surface acceleration response. And the exterior acoustic field was calculated by the BEM （Boundary Element Method）. Optimization was made according to modal shape, and the o;eerall Sound Power Level （SPL） of the optimized oil pan was decreased by 2.6 dB （A）. This method may provide some guidance for the oil pan noise radiation calculation and reduction.