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論文(논문) : 달 착륙선 지상시험모델의 경로 추종을 위한 추력기 기반 제어기 설계
김광진 ( Kwang Jin Kim ),이정숙 ( Jeong Sook Lee ),이상철 ( Sang Chul Lee ),고상호 ( Sang Ho Ko ),류동영 ( Dong Young Rhyu ),주광혁 ( Gwang Hyeok Ju ) 한국항공운항학회 2011 한국항공운항학회지 Vol.19 No.4
Lunar exploration program has been prepared with the aim of launch in the 2020`s. As part of it, a lunar lander demonstrator has been developed which is the model for verifying all the system, such as structure, propulsion and control system before launch to deep space. After verifying all the system, the demonstrator will be evaluated by flight test. This paper deals with path tracking controller based on thrusters for the demonstrator. For this, first we derive equations of motion according to the allocation of thrusters and design the path tracking controller. The signal generated from the controller is continuous so PWPF(Pulse-Width Pulse-Frequency) modulator is adopted for generating on/off signal. Finally MATLAB simulation is performed for evaluating the path tracking ability and the final landing velocity.
달 탐사선의 동역학 모델링 및 관성 모멘트 추정에 관한 연구
심상현 ( Sang Hyun Shim ),김광진 ( Kwang Jin Kim ),이상철 ( Sang Chul Lee ),고상호 ( Sang Ho Ko ),류동영 ( Dong Young Rhyu ),주광혁 ( Gwang Hyeok Ju ) 한국항공운항학회 2010 한국항공운항학회지 Vol.18 No.4
This paper deals with attitude determination and parameter estimation problems for a lunar module. For this we first derive equations of motion for the lunar module by considering allocation locations (configurations) of reaction thruster and a reaction wheel assembly. The lunar module is assumed as a rigid body. In order to include the effect of fuel sloshing on the dynamics of the lunar module, we model it as a spherical pendulum for a simple analysis. For estimating angular rates and moment of inertia of the module, we employ an extended Kalman filter and the least mean square algorithms, respectively. Finally we construct a dynamical model for the lunar module by combining all these elements.