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为了降低发动机的整机辐射噪声,采用虚拟预测-形貌优化方法对某柴油机油底壳进行了低噪声改进设计。将虚拟预测方法与试验法有机结合,采用有限元法与声学边界元仿真相结合的设计思路:用试验法实测油底壳表面振动载荷,用有限元法分析载荷作用下的动态响应,用声学边界元仿真模拟由该动态响应引起的辐射噪声;并在此基础上对原油底壳运用形貌优化的方法进行以降低辐射噪声为目标的优化设计,同时,在形貌优化结果的基础上,结合冲压结构加工工艺性要求提出了改进方案。研究结果表明:形貌优化方法的仿真结果与试验结果吻合较好,总辐射声功率级降低了3.2 dB,降噪效果明显。
In order to reduce the engine noise radiation, the virtual prediction - topography optimization method was used to improve the design of a diesel engine oil pan with low noise. The virtual prediction method and experiment method are combined organically, and the design method of combining finite element method with acoustic boundary element simulation is adopted. The vibration load of oil pan surface is measured by test method, the dynamic response under load is analyzed by finite element method, The boundary element is used to simulate the radiated noise caused by the dynamic response. Based on this, the optimal design of the crude oil pan using topography optimization to reduce the radiated noise is put forward. On the basis of the topography optimization results, Combined with the stamping structure of the processing requirements of the proposed improvement program. The results show that the simulation results of the morphology optimization method are in good agreement with the experimental results, the total radiation power level is reduced by 3.2 dB, and the noise reduction effect is obvious.