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Transient airload computer analysis for simulating wind induced impulsive noise conditions of a hovering helicopter rotor
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Hall, G. F. |
| Copyright Year | 1975 |
| Description | A numerical analysis was developed to determine the airloads on helicopter rotors operating under near-hovering flight conditions capable of producing impulsive noise. A computer program was written in which the solutions for the rotor tip vortex geometry, inflow, aeroelastic response, and airloads are solved in a coupled manner at sequential time steps, with or without the influence of an imposed steady ambient wind or transient gust. The program was developed for future applications in which predicted airloads would be incorporated in an acoustics analysis to attempt to predict and analyze impulsive noise (blade slap). The analysis was applied to a hovering full-scale rotor for which impulsive noise was recorded in the presence of ambient wind. The predicted tip vortex coordinates are in reasonable agreement with the test data, and the blade airload solutions converged to a periodic behavior for an imposed steady ambient wind conditions. |
| File Size | 11419807 |
| Page Count | 49 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19760002917 |
| Archival Resource Key | ark:/13960/t1vf1mb0m |
| Language | English |
| Publisher Date | 1975-10-01 |
| Access Restriction | Open |
| Subject Keyword | Aerodynamics Blade Tips Helicopters Blade-vortex Interaction Periodic Variations Hovering Rotary Wings Computer Programs Numerical Analysis Vortices Coupled Modes Gust Loads Blade Slap Noise Wind Meteorology Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
