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Interactive aircraft flight control and aeroelastic stabilization (Document No: 19860002766)
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Weisshaar, T. A. |
| Copyright Year | 1985 |
| Description | Aeroservoelastic optimization techniques were studied to determine a methodology for maximization of the stable flight envelope of an idealized, actively controlled, flexible airfoil. The equations of motion for the airfoil were developed in state-space form to include time-domain representations of aerodynamic forces and active control. The development of an optimization scheme to stabilize the aeroelastic system over a range of airspeeds, including the design airspeed is outlined. The solution approach was divided in two levels: (1) the airfoil structure, with a design variable represented by the shear center position; and (2) the control system. An objective was stated in mathematical form and a search was conducted with the restriction that each subsystem be constrained to be optimal in some sense. Analytical expressions are developed to compute the changes in the eigenvalues of the closed-loop, actively controlled system. A stability index is constructed to ensure that stability is present at the design speed and at other airspeeds away from the design speed. |
| File Size | 1191996 |
| Page Count | 49 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19860002766 |
| Archival Resource Key | ark:/13960/t0sr3rn08 |
| Language | English |
| Publisher Date | 1985-11-01 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Stability And Control Airspeed Limits Mathematics Airfoils Mathematical Models Aerodynamic Stability Aerodynamic Forces Equations of Motion Flight Control Aeroelasticity Flight Envelopes Optimization 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 |
