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A theoretical investigation of noise reduction through the cylindrical fuselage of a twin-engine, propeller-driven aircraft
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Mixson, J. S. Bhat, R. B. |
| Copyright Year | 1978 |
| Description | Interior noise in the fuselage of a twin-engine, propeller-driven aircraft with two propellers rotating in opposite directions is studied analytically. The fuselage was modeled as a stiffened cylindrical shell with simply supported ends, and the effects of stringers and frames were averaged over the shell surface. An approximate mathematical model of the propeller noise excitation was formulated which includes some of the propeller noise characteristics such as sweeping pressure waves around the sidewalls due to propeller rotation and the localized nature of the excitation with the highest levels near the propeller plane. Results are presented in the form of noise reduction, which is the difference between the levels of external and interior noise. The influence of propeller noise characteristics on the noise reduction was studied. The results indicate that the sweep velocity of the excitation around the fuselage sidewalls is critical to noise reduction. |
| File Size | 1421809 |
| Page Count | 48 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19790005650 |
| Archival Resource Key | ark:/13960/t50g8g60h |
| Language | English |
| Publisher Date | 1978-12-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Cylindrical Shells Numerical Analysis Noise Reduction Aircraft Noise Propeller Drive Fuselages Aeroacoustics Reinforced Shells 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 |
