基于流固耦合和模态参与因子的低噪声油底壳优化设计研究

Low Noise Optimization Design of Oil Pan Based on Liquid-Solid Coupling Method and Modal Participation Factors

进行了流固耦合油底壳模型的振声预测,结果与试验吻合较好。结合模态参与因子和声功率级曲线确定了优化目标,采用多目标形貌优化对油底壳进行低噪声结构优化设计,通过合理增添加强筋,优化后总辐射声功率级降低了2.1dB。对塑化后的PA66工程塑料油底壳进行了噪声预测,与原金属油底壳相比,塑料油底壳减重30%,噪声降低了3.4dB,综合性能优异。研究结果表明:对油底壳进行结构优化和塑化均取得明显降噪效果,为低噪声油底壳设计提供了新思路。

The vibration and radiated noise from oil pan were predicted and estimated by a liquid and solid coupled model, and the results were essentially identical with the test data. According to the modal participation factors and the sound power level curve, the optimization objectives were determined. Then the multi-objective optimization was applied to the structure topography optimization. The overall noise was reduced by 2.1 dB compared with the original overall sound power level through appropriate arrangement of the stamping ribs. The noise from PA66 plastic oil pan was predicted at last. Compared with the metal oil pan, it had a high performance：the weight was reduced by 30% and overall noise was reduced by 3.4 dB. The results show that the two methods for engine noise reduction can achieve sound effects. It provides a new idea for low noise oil pan design.