汽车排气消声器性能分析及改进
Performance analysis and improvement of automotive exhaust muffler

针对某汽车排气消声器插入损失不达标的问题，利用GT-Power软件建立了发动机与进排气系统耦合的仿真模型，对排气消声器的声学性能和空气动力性能进行数值计算，分析了发动机转速1 000~2 500（r·min-1）范围内的插入损失和压力损失。根据分析结果，基于试验设计（Design of Experiment，DOE）方法，对消声器结构进行多工况、多参数、多目标优化。优化结果表明，改进后的消声器的插入损失有了明显提升，空气动力性能良好，其综合性能得到显著提升。
Aiming at the problem that the insertion loss of an automobile exhaust muffler has not been up to standard, a coupling simulation model of coupling between the engine and the intake and exhaust system is established by GT-Power software. The acoustic performance and aerodynamic performance of the exhaust muffler are calculated numerically. The insertion loss and pressure loss are analyzed at an engine speed range between 1 000 and 2 500 rpm. According to the analysis results, a multi-condition, multi-parameter and multi-objective optimization is conducted to the muffler structure based on the DOE (Design of Experiment) method. The optimization results indicate that the insertion loss of the optimized muffler is obviously promoted, the aerodynamic performance is satisfactory, and its comprehensive performance is significantly improved.