Modeling and control law design of ramjet engine for supercritical operation = 램제트 엔진의 초임계 운전 모델링 및 제어기법 연구

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A dynamic model for ramjet engine having variable nozzle is developed and its control law is designed for supercritical operation considering model uncertainty and air disturbances. The dynamic model of engine is subdivided into several sections to capture the dominant physical phenomenon such as supersonic, subsonic cold gas flow and combustor hot gas flows and is assembled by connecting separate sections with connecting gas dynamic variables. To control the supersonic intake, the terminal shock position is selected as model output about the variable nozzle throat input. The model accuracy is compared with the engine performance results which are verified through CFD simulation for different altitude, Mach number and control inputs. An air disturbance model suggested by Tank and downstream disturbance are quantified to obtained uncontrollable supercritical margin considering nozzle actuator dynamics. To measure the allowable position of terminal shock, sensitivity equation is induced and combined with the quantified disturbance. Nonlinear adaptive backstepping scheme is applied to obtain robust and simple control law under the model uncertainties which is induced from model reduction. The stability of controller is induced from Lyapunov based theory and the performance and stability of controller is verified through several numerical simulations by combining independent disturbances.
Advisors
Tahk, Min-Jearesearcher탁민제researcher
Description
한국과학기술원 : 항공우주공학전공,
Publisher
한국과학기술원
Issue Date
2011
Identifier
466503/325007  / 020065067
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 항공우주공학전공, 2011.2, [ xii, 98 p. ]

Keywords

버즈마진; 엔진제어; 램제트; 적응제어; adaptive control; buzz margin; engine control; ramjet

URI
http://hdl.handle.net/10203/26418
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=466503&flag=dissertation
Appears in Collection
AE-Theses_Ph.D.(박사논문)
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