Design of Double-Tuned Helmholtz Resonators Created by Punching Small Slots on a Thin-Walled Tube to Reduce Low-Frequency Tonal Noise
- Delivery
- Provide download link
- Format
- Price
- Non-members (tax incl.)：￥6,600 Members (tax incl.)：￥5,280
- Paper/Info type
- SAE Paper
No.2021-01-1040
- Pages
- 1-9(Total 9 p)
- Date of publication
- Aug 2021
- Publisher
- SAE International
- Language
- English
- Event
- Noise and Vibration Conference & Exhibition
Detailed Information
| Author(E) | 1) Hao Zhou, 2) T. W. Wu, 3) D. W. Herrin |
|---|---|
| Affiliation(E) | 1) University of Kentucky, 2) University of Kentucky, 3) University of Kentucky |
| Abstract(E) | 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. |
