| Summary: | 碩士 === 中華科技大學 === 飛機系統工程研究所 === 105 === The transport aircraft in flight is subjected to atmospheric turbulence resulting in rapidly varying aerodynamic and flight dynamic characteristics. These varying characteristics not only pose threats to flight safety, but also may cause structural damages and reduce fatigue life. Since the sudden plunging motion frequently causes injuries to passengers and crew members, it is important to provide the mitigation concepts and formulate preventive actions for aircraft operation, a new study of improved control strategy before and during the severe atmospheric turbulence encounters is presented. Two similar twin-jet transports encountered severe atmospheric turbulence to cause the flight safety events are practical cases for the present study. Fuzzy-logic modeling (FLM) technique is used to establish the flight control models based on the datasets from the Flight Data Recorder. The flight control models have the function of nonlinear dynamic inversion. The improved control strategy can be obtained through the simulations of flight control models of rudder, aileron, and elevator. The simulated results determine that improved control strategy is capable to mitigate the hazards of transport aircraft in severe atmospheric turbulence.
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