Munjal, ML and Thawani, PT (1997) Effect of protective layer on the performance of absorptive ducts. In: Noise Control Engineering Journal, 45 (1). pp. 14-18.
Full text not available from this repository. (Request a copy)Abstract
Acoustically absorptive lining in ducts and parallel-baffle mufflers is invariably protected from the abrasive effect of grazing flow and dust by means of a protective layer in the form of highly porous thin metallic plate or cloth, or a very thin impervious layer of synthetic material like Mylar. An investigation of effects of protective layers on the acoustic performance of lined circular ducts and parallel-baffle mufflers (modeled as two-dimensional rectangular ducts) is the subject of this paper. Analytical models are presented for both cases with bulk reacting as well as locally reacting absorptive linings protected by a perforated or un-perforated layer, These simple models based upon a stationary inviscid medium are then used in a parametric study to provide noise control engineers with necessary design information, The effect of grazing flow on the impedance of a perforated protective plate is duly accounted for in the model.
| Item Type: | Journal Article |
|---|---|
| Publication: | Noise Control Engineering Journal |
| Publisher: | Institute of Noise Control Engineering of the USA |
| Additional Information: | Copyright of this article belongs to Institute of Noise Control Engineering of the USA. |
| Department/Centre: | Division of Mechanical Sciences > Mechanical Engineering |
| Date Deposited: | 02 Jun 2009 06:51 |
| Last Modified: | 02 Jun 2009 06:51 |
| URI: | http://eprints.iisc.ac.in/id/eprint/18901 |
Actions (login required)
 |
View Item |
