Abstract
Micro-perforated panel (MPP) as a new generation of sound absorbing material has great potential for machinery and vehicle applications. In this study, according to the intake noise behaviors of an automobile engine under accelerating working conditions, a compact MPP muffler with a serial-parallel coupling mode is proposed for silencing. The mathematical model of transmission loss for the serial-parallel coupled MPP muffler is established by utilizing the transfer matrix method, and then validated by utilizing the finite element method. On the basis of that, the multi-population genetic algorithm is adopted to optimize the muffler so that optimal combination of structure parameters can be obtained. In addition, the optimized muffler is manufactured by 3D printing technology for experimental investigation. The results show that the optimal design of the proposed serial-parallel coupled MPP muffler is practical and effective; and the wideband engine intake noise within the medium-high frequency range is obviously attenuated through adopting the optimized serial-parallel coupled MPP muffler, which may provide a good solution for vehicle and other noise controls.
Published Version
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