Abstract
Semi-active Helmholtz resonators are used to reduce noise in ducts. The Helmholtz resonators incorporated with an active noise control system work effectively over a widen frequency range. In duct system, noise is generated by ventilation devices and the flow accompanied significantly influence the noise reduction performance of the semi-active Helmholtz resonator. In this paper, the effect of flow on a semi-active Helmholtz resonator is investigated. The side branch Helmholtz resonator is terminated by an active control device which adjusted to tune the resonance frequency. Base on a simplified model which describes the transmission loss under a low Mach number mean flow, the flow effect is considered in the active noise control algorithm. The derived transfer fiinction optimally adjusts the termination impedance to control noise in a low Mach mean flow duct.
| Original language | English |
|---|---|
| Title of host publication | 19th International Congress on Sound and Vibration 2012, ICSV 2012 |
| Pages | 133-137 |
| Number of pages | 5 |
| Volume | 1 |
| Publication status | Published - 1 Dec 2012 |
| Event | 19th International Congress on Sound and Vibration 2012, ICSV 2012 - Vilnius, Lithuania Duration: 8 Jul 2012 → 12 Jul 2012 |
Conference
| Conference | 19th International Congress on Sound and Vibration 2012, ICSV 2012 |
|---|---|
| Country/Territory | Lithuania |
| City | Vilnius |
| Period | 8/07/12 → 12/07/12 |
ASJC Scopus subject areas
- Acoustics and Ultrasonics