Design of Double-Tuned Helmholtz Resonators Created by Punching Small Slots on a Thin-Walled Tube to Reduce Low-Frequency Tonal Noise

Research output: Contribution to journalConference articlepeer-review

Abstract

Helmholtz resonators are often used in the design of vehicle mufflers to target tonal noise at a few specific low frequencies generated by the engine. Due to the uncertainty of temperature variations and different engine speeds, multiple resonators may have to be built in series to cover a narrow band of frequencies. Double-tuned Helmholtz resonators (DTHR) normally consist of two chambers connected in series. Openings or necks are created by punching small slots into a thin-walled tube which provide a natural neck passage to the enclosing volume of the Helmholtz resonator. In this paper, numerical analyses using both the boundary element (BEM) and the finite element (FEM) methods are performed and simulation results are compared against one another. A typical real-world muffler configuration commonly used in passenger vehicles is used in a case study. It is shown that the proposed slot design concept can improve the low-frequency performance while maintaining similar performance at high frequencies.

Original languageEnglish
JournalSAE Technical Papers
Issue number2021
DOIs
StatePublished - Aug 31 2021
EventSAE 2021 Noise and Vibration Conference and Exhibition, NVC 2021 - Virtual, Online, United States
Duration: Sep 7 2021Sep 10 2021

Bibliographical note

Funding Information:
The research was partially supported by the Vibro-Acoustics Consortium.

Publisher Copyright:
© 2021 SAE International. All Rights Reserved.

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering

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