基于DOE的挖掘机排气消声器结构优化设计

摘要

以某型挖掘机的排气消声器为例，通过现场测试及仿真分析，找出了消声量较小的频率段。运用DOE方法，对各消声单元主要尺寸进行参数化建模，安排优化拉丁方试验，分析各消声结构对其消声性能的贡献量。通过多目标优化计算得到最优化的消声器结构参数。优化后消声器的模拟计算结果表明，改进后的消声器在目标频率段的消声量明显提高。%An exhaust muffler of a digging machine is studied to find the weak frequency band with test and CAE method. With the internal structure characteristics of the muffler as design factors, the main sizes of anechoic components are parameterized based on DOE. The Latin square optimization experiment is done to analyze the noise elimination contribution of each muffler component. And the optimized muffler structural parameters are obtained through multi-objective optimization. Simulation result of the optimized muffler indicates that the noise attenuation performance in the target frequency band is significantly improved.