Analysis and optimization of silencing performance of flexible wall expansion muffler

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (21) : 142-148.

LIU Xiaoang1, HAN Zikang1, LI Hao2, ZHEN Ran3, LI Laixin3, SHANGGUAN Wenbin4

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Abstract

In the intake pipeline of vehicle, for the limitations of the sound attenuation performance of traditional muffler with rigid walls, taking expansion muffler with flexible walls as the research object, an analytical model of sound - structure coupling of expansion muffler with flexible walls is established and verified. The sound attenuation performance of the muffler with rigid walls and flexible walls were compared. Improving the peak value and mean value of the transmission loss of the muffler were setted as the goal, the Young's modulus and wall thickness of flexible walls, the expansion ratio of the muffler were used as the optimization variables, the muffler with flexible walls was optimized using genetic algorithm. The results show that the established model has high accuracy; Compared with muffler with rigid walls, muffler with flexible walls have higher peak transmission loss and lower peak frequency; the optimization scheme adopted is effective; the design muffler is applicable in the intake pipeline.

Key words

intake pipeline / expansive muffler / sound-solid coupling / transmission loss / optimization;

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LIU Xiaoang1, HAN Zikang1, LI Hao2, ZHEN Ran3, LI Laixin3, SHANGGUAN Wenbin4. Analysis and optimization of silencing performance of flexible wall expansion muffler[J]. Journal of Vibration and Shock, 2023, 42(21): 142-148

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