Abstract
The paper presents the design of a reconfigurable adaptive control (RAC) system for limit cycle oscillation (LCO) suppression of aircraft/store configurations. With the F/A-18 as a baseline aircraft, rapid suppression of LCO (at 5.6 and 8.8 Hz) has been successfully demonstrated through five cases of numerical simulations studied. The developed RAC system is a modular control design in that the LCO controller can readily be combined with the rigid-body flight (RBF) control, thereby minimizing the impact on the existing flight control system for retrofit. The RAC system consists of a nearly developed on-line modal parameter estimation (MPE) for system identification and on-line modified model-following reconfigurable (MMFR) algorithm for rapid flutter/LCO control (requires only 0.2 and 0.8 sec). The ZAERO software system using an expedient nonlinear unsteady transonic method (ZTAIC) is employed to generate plant matrices. Reduced-order techniques using proper orthogonal decomposition (POD) and minimum state (MIST) methods reduce the system to seven states, rendering an on-line algorithm to be operated within fractions of one second.
Original language | English (US) |
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Title of host publication | 19th AIAA Applied Aerodynamics Conference |
State | Published - 2001 |
Externally published | Yes |
Event | 19th AIAA Applied Aerodynamics Conference 2001 - Anaheim, CA, United States Duration: Jun 11 2001 → Jun 14 2001 |
Other
Other | 19th AIAA Applied Aerodynamics Conference 2001 |
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Country/Territory | United States |
City | Anaheim, CA |
Period | 6/11/01 → 6/14/01 |
ASJC Scopus subject areas
- Aerospace Engineering
- Mechanical Engineering