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Prediction of the acoustic impedance of duct liners
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Zorumski, W. E. Tester, B. J. |
| Copyright Year | 1976 |
| Description | Recent research which contributes to the prediction of the acoustic impedance of duct liners is reviewed. This review includes the linear and nonlinear properties of sheet and bulk type materials and methods for the measurement of these properties. It also includes the effect of grazing flow on the acoustic properties of materials. Methods for predicting the properties of single or multilayered, point reacting or extended reaction, and flat or curved liners are discussed. Based on this review, methods for predicting the properties of the duct liners which are typically used in aircraft engines are recommended. Some areas of needed research are discussed briefly. |
| File Size | 2685798 |
| Page Count | 61 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19760024891 |
| Archival Resource Key | ark:/13960/t12n9wz4w |
| Language | English |
| Publisher Date | 1976-09-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Ducted Flow Engine Noise Aircraft Noise Linings Acoustic Ducts Aircraft Engines Grazing Flow Noise Measurement Engine Parts Acoustic Impedance Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
