Acoustic-structure Coupling Analysis and Optimization of Muffler

While the muffler attenuates the noise, the structure also withstands the impact of the airflow, in order to explore the influence of this acoustic-structure interaction on the silencing performance of mufflers. Modal superposition method is used to calculate the transmission loss of diesel exhaust muffler considering acoustic-structure coupling. The results show that the average transmission loss under acoustic-structure coupling decreases by 7.4%. The transmission loss changes abruptly in varying degrees, and the stability of muffler is seriously affected. By stiffening the dominant mode shape at the maximum frequency point of the coupling loss reduction, the transmission loss under the influence of acoustic-solid coupling is improved and the performance of muffler is strengthened. (paper)