排气消声器优化模型探讨

Study of Exhaust Muffler Model

将噪声源、消声管路和外界组成一般排气系统，对消声器消声特性进行计算，运用传递矩阵法给出了消声器插入损失的数学模型，分析了消声器内压力的损失及消声器目标消声量的频带特性对消声器优化设计的影响，提出并建立了兼顾消声器各项设计要求的新优化设计模型．运用 Ｂｏｒｌａｎｄ Ｃ＋＋和 Ｍａｔｃｌａｂ对新优化设计模型进行了计算，并编制了优化软件，最后对计算模型的预测精度和优化效果进行了试验室动态试验，证实计算和新建优化模型是正确可行的．

The performance of an exhaust muffler of internal combustion engine is related not only to the construstion of itself, but also to the characters of the exhaust noise sourse. In this paper, the usual eahaust system consists of noise sourse, muffler tube and outside surrounding. This article calculates the reducing noise characters of the muffler, builds the mathematical model of the insertion loss of muffler on basis of the transfer matrix method, analysises the inside pressure loss of the muffler and the influence of the frequency characters on the muffler optimum design. The new optimization model is developed, which the demand of muffler design is met in. On this basis, authors use Borland C++ and Matclab to make the program of calculation and optimum design. The optimization model is verified to be practical.