彈性荷姆霍茲共振器的特性研究

• Main Author: 高源宏
• Other Authors: 盧中仁
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/08396464713023980287

碩士 === 國立臺灣大學 === 機械工程學研究所 === 90 === Rigid Helmholtz resonators are commonly used for noise attenuation in ducts. However, the attenuation is limited to a single, narrow frequency bandwidth. Recent works have shown that elastic Helmholtz resonators, i.e., Helmohtz resonators with elastic boundary, can attenuate wideband noise effectively. In this thesis, we study the effect of the properties of the elastic boundary on the performance of Helmholtz resonator for noise suppression. Finite element method is employed to analyze the acoustic filed of the system consisted of single or multiple resonators attached to a one-dimensional duct. The results show that Young’s modulus of the elastic boundary has a great influence on the transmission loss. We also investigate the propagation of single pulse passing different resonators. The frequency spectrum of the downstream pressure profile can used to identify the properties of the elastic boundary of the resonator.