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A control allocation system for automatic detection and compensation of phase shift due to actuator rate limiting
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Kolmanovsky, Ilya V. Yildiz, Yidiray Acosta, Diana |
| Copyright Year | 2011 |
| Description | This paper proposes a control allocation system that can detect and compensate the phase shift between the desired and the actual total control effort due to rate limiting of the actuators. Phase shifting is an important problem in control system applications since it effectively introduces a time delay which may destabilize the closed loop dynamics. A relevant example comes from flight control where aggressive pilot commands, high gain of the flight control system or some anomaly in the system may cause actuator rate limiting and effective time delay introduction. This time delay can instigate Pilot Induced Oscillations (PIO), which is an abnormal coupling between the pilot and the aircraft resulting in unintentional and undesired oscillations. The proposed control allocation system reduces the effective time delay by first detecting the phase shift and then minimizing it using constrained optimization techniques. Flight control simulation results for an unstable aircraft with inertial cross coupling are reported, which demonstrate phase shift minimization and recovery from a PIO event. |
| File Size | 559654 |
| Page Count | 6 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20110016004 |
| Archival Resource Key | ark:/13960/t6f23z364 |
| Language | English |
| Publisher Date | 2011-06-29 |
| Access Restriction | Open |
| Subject Keyword | Avionics And Aircraft Instrumentation Control Simulation Actuators Cross Coupling Phase Shift Pilot Induced Oscillation High Gain Flight Control Destabilization Time Lag Anomalies Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
