Optimization of Noise Reduction Performance for the Muffler in a Heavy Vehicle

Abstract

The noise reduction performance of the muffler is further optimized in order to study the acoustic performance of the high-performance composite muffler. On the basis of reasonable assumptions, the boundary values of the entrance and exit, which of the inner wall surface of the muffler are set up. The internal acoustic finite element model is established through HYPERMESH, and the transmission loss(TL) is calculated by the SYSNOISE module in Virtual. lab. Then, the effect on noise reduction performance by the main structural parameters of muffler, such as the hole diameter of the perforating tube, the number of expansion chamber, and the position of the main air flow passage are discussed. The experiment proves that the noise reduction performance of the muffler is improved effectively, proves the practicability of this method, and also gives a solution for the design and optimization of complex muffler.