Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/62138
Title: An extended neck versus a spiral neck of the helmholtz resonator
Authors: Cai, C
Mak, CM 
Shi, X
Keywords: Extended neck
Helmholtz resonator
Noise control
Spiral neck
Issue Date: 2017
Publisher: Pergamon Press
Source: Applied acoustics, 2017, v. 115, p. 74-80 How to cite?
Journal: Applied acoustics 
Abstract: This paper focuses on improving the noise attenuation performance of the Helmholtz resonator (HR) at low frequencies with a limited space. An extended neck or a spiral neck takes the place of the traditional straight neck of the HR. The acoustic performance of the HR with these two types of necks is analyzed theoretically and numerically. The length correction factor is introduced through a modified one-dimensional approach to account for the non-planar effects that result from the neck being extended into the cavity. The spiral neck is transformed to an equivalent straight neck, and the acoustic performance is then derived by a one-dimensional approach. The theoretical prediction results fit well with the Finite Element Method (FEM) simulation results. Without changing the cavity volume of the HR, the resonance frequency shows a significant drop when the extended neck length or the spiral neck length is increased. The acoustic characteristics of HRs with these two different neck types have a potential application in noise control, especially at low frequencies within a constrained space.
URI: http://hdl.handle.net/10397/62138
ISSN: 0003-682X
EISSN: 1872-910X
DOI: 10.1016/j.apacoust.2016.08.020
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