The Helmholtz resonator with different types of necks

Chenzhi Cai, Cheuk Ming Mak, Xiaofeng Shi, Xu Wang

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

Abstract

This paper focuses on improving the noise attenuation performance of the Helmholtz resonator (HR) at low frequencies with a limited space. Three different types of necks: 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 spiral neck is transformed to an equivalent straight neck, and the acoustic performance is then obtained by a one-dimensional approach. A length correction factor for the extended neck is developed through a modified one-dimensional approach to take the non-planar effects into account. The theoretical prediction results fit well with the Finite Element Method (FEM) simulation results. The results show that significant improvement of the acoustic performance of the HR can be obtained by introducing these necks. 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.
Original languageEnglish
Title of host publicationINTER-NOISE 2017 - 46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet
PublisherInstitute of Noise Control Engineering
Publication statusPublished - 1 Jan 2017
Event46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, INTER-NOISE 2017 - Hong Kong Convention and Exhibition Centre (HKCEC), Hong Kong, Hong Kong
Duration: 27 Aug 201730 Aug 2017

Conference

Conference46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, INTER-NOISE 2017
CountryHong Kong
CityHong Kong
Period27/08/1730/08/17

Keywords

  • Extended neck
  • Helmholtz resonator
  • Noise control
  • Spiral neck

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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