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Evaluation of aero commander propeller acoustic data: static operations
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Wilby, J. F. Piersol, A. G. Wilby, E. G. |
| Copyright Year | 1978 |
| Description | Acoustic data are analyzed from a series of ground tests performed on an Aero Commander propeller-driven aircraft with an array of microphones flush-mounted on one side of the fuselage. The analyses were concerned with the propeller blade passage noise during static operation at several different engine speeds and included calculations of the magnitude and phase of the blade passage tones, the amplitude stability of the tones, and the spatial phase and coherence of the tones. The results indicate that the pressure field impinging on the fuselage represents primarily aerodynamic (near field) effects in the plane of the propeller at all frequencies. Forward and aft of the propeller plane aerodynamic effects still dominate the pressure field at frequencies below 200 Hz; but at higher frequencies, the pressure field is due to acoustic propagation from an equivalent center located about 0.15 to 0.30 blade diameters inboard from the propeller hub. |
| File Size | 3350438 |
| Page Count | 103 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19790004686 |
| Archival Resource Key | ark:/13960/t19k94q5m |
| Language | English |
| Publisher Date | 1978-05-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Propeller Blades Acoustic Measurement Aircraft Noise Propeller Drive Pressure Distribution Data Processing Light Aircraft Aeroacoustics Static Tests 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 |
