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Experimentally determined flutter from two- and three-bladed model bearingless rotors in hover
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Dawson, S. Bousman, W. G. |
| Copyright Year | 1985 |
| Description | A series of experiments was performed on a 1.8-m-diam model rotor in hover for the principal purpose of investigating the lead-lag stability of isolated bearingless rotors. Incidental to those tests, at least three types of pitch-flap flutter were encountered. Type 1 flutter occurred approximately at the second flap-mode frequency on both two-and three-bladed rotors for both small and large pitch angles and appeared to be a classic pitch-flap flutter. Type 2 flutter showed mostly torsional motion and was seen on both two- and three-bladed rotors. Type 3 flutter was a regressing flap flutter that occurred for only the three-bladed rotor configurations and appears to be a wake excited flutter. Although flutter occurred on a number of different configurations, no rotor parameters were identified that were clearly stabilizing or destabilizing. |
| File Size | 1126290 |
| Page Count | 20 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19860005816 |
| Archival Resource Key | ark:/13960/t0kt1k87q |
| Language | English |
| Publisher Date | 1985-11-01 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Stability And Control Aircraft Stability Aerodynamic Configurations Resonant Frequencies Bearingless Rotors Pitch Rotor Aerodynamics Flutter Torsional Vibration Rotor Body Interactions Hovering Flapping Helicopter Wakes Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
