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Controls design with crossfeeds for hovering rotorcraft using quantitative feedback theory (Document No: 19940026698)
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Biezad, Daniel J. |
| Copyright Year | 1994 |
| Description | This work is extending the research accomplished on project NCC2-751. A newly implemented helicopter model has been used to simulate 25 flight configurations near hover for the UH-60 RASCAL aircraft. A new engine model has been installed in the FORECAST simulation (alias UMGENHEL) for the better prediction of the yaw and heave responses. By applying the decoupling metric from project NCC 751 it was determined that the aileron to pitch and the elevator to yaw responses do not indicate the need for crossfeeds since both of them have a decoupling metric value over 20 dB (less than 10 percent coupling). In the case of the aileron to heave and the elevator to heave responses, the large size and the overlapping of the templates indicate that a low-order dynamic crossfeed cannot be found. The low-order dynamic crossfeed selection is proceeding, however, for the remaining eight crossfeeds. Note that most of them have successfully decoupled the system by 20 dB or more, except for the rudder to heave crossfeed (18.2 dB). It is probable that the engine model needs more accuracy to further improve the heave to yaw crossfeed decoupling metric value. To see how the new low-order dynamic crossfeeds perform, a simulation was accomplished using MATLAB SIMULINK. |
| File Size | 749823 |
| Page Count | 30 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19940026698 |
| Archival Resource Key | ark:/13960/t5r838d9x |
| Language | English |
| Publisher Date | 1994-04-15 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Stability And Control Dynamic Response Aircraft Stability Helicopter Control Flight Control Aerodynamic Stability Yaw Hovering Aircraft Models Hovering Stability Directional Stability Decoupling Feedback Rotary Wing Aircraft Lateral Control Flight Simulation 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 |
