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Flap-lag-torsion aeroelastic stability of a circulation control rotor in forward flight
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Hong, Chang-Ho Chopra, Inderjit |
| Copyright Year | 1987 |
| Description | The aeroelastic stability of a circulation control rotor blade undergoing three degrees of motion (flap, lag, and torsion) is investigated in forward flight. Quasi-steady strip theory is used to evaluate the aerodynamics forces; and the airfoil characteristics are from data tables. The propulsive and the auxiliary power trims are calculated from vehicle and rotor equilibrium equations through the numerical integration of element forces in azimuth as well as in radial directions. The nonlinear time dependent periodic blade response is calculated using an iterative procedure based on Floquet theory. The periodic perturbation equations are solved for stability using Floquet transition matrix theory. The effects of several parameters on blade stability are examined, including advance ratio, collective pitch, thrust level, shaft tilt, structural stiffnesses variation, and propulsive and auxiliary power trims. |
| File Size | 951984 |
| Page Count | 38 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19880008216 |
| Archival Resource Key | ark:/13960/t75t8hx2v |
| Language | English |
| Publisher Date | 1987-05-01 |
| Access Restriction | Open |
| Subject Keyword | Aerodynamics Horizontal Flight Aerodynamic Balance Circulation Control Rotors Floquet Theorem Flaps Control Surfaces Equilibrium Equations Aerodynamic Stability Aeroelasticity Torsion Aerodynamic Loads Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
