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Techniques for improving the stability of soft inplane hingeless rotors
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Ormiston, R. A. |
| Copyright Year | 1974 |
| Description | The influence of basic parameters that govern flap lag stability of hingeless rotor blades in hover is reviewed, and potential methods are studied for improving the lead lag damping of soft inplane configurations for low thrust conditions. These conditions are relevant for ground and air resonance stability of coupled rotor body dynamic systems. Results indicate that the isolated rotor blade lead lag damping can be usefully increased by a combination of flap lag elastic coupling and pitch lag coupling. For a typical soft inplane configuration, 6% of critical damping can be obtained for moderate pitch lag coupling. For large values of the coupling parameters, the lead lag frequency is substantially reduced at high pitch angles and airfoil stall effects also reduce the lead lag damping. |
| File Size | 3095760 |
| Page Count | 57 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19750001986 |
| Archival Resource Key | ark:/13960/t6m08wb28 |
| Language | English |
| Publisher Date | 1974-10-01 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Design, Testing And Performance Vibration Damping Aerodynamic Configurations Rigid Rotors Helicopter Propeller Drive Elastic Damping Rotor Blades Low Thrust Aerodynamic Stability Hovering 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 |
