A novel multi-cavity Helmholtz muffler

• 来源期刊: 中国物理B（英文版）
• 关键词: multi-cavity Helmholtz muffler negative mass density noise reduction
• 年，卷（期）: 2019,（5）
• 页码范围: 174-182
• 页数: 9页
• 语种: 英文
• DOI: 10.1088/1674-1056/28/5/054303

摘要

A novel multi-cavity Helmholtz muffler is proposed. The multi-cavity Helmholtz muffler is composed of steel struc-tures and silicone membranes. With suitable construction, the Helmholtz muffler can be designed to exhibit negative mass density in low frequency, and the muffling frequency can be adjusted when we change the internal structure of the cavity, which will be very attractive for noise control. In this paper, we investigate the influence of the membranes and the cavi-ties on noise reduction characteristics with theoretical calculations and simulations. The results show that the numbers of membranes and the volumes of the cavities can have a great effect on the position of the muffling frequency. The number of cavities can have a great effect on the width of the muffling frequency (reduce the noise by 10 Db). With different combina-tions of the membranes and cavities, we can get different muffling frequencies, which can meet different muffling demands in practical applications and is more flexible than the traditional Helmholtz cavity.