To realize innovative transportation systems for intercontinental flight and orbital spaceflight, it is essential to establish the necessary aerodynamic, structural, propulsion, and control technologies for a vehicle to fly at high altitudes and speeds within the atmosphere, and to verify them by using small-scale unmanned supersonic experimental aircraft. This paper describes the control technologies for a 3-kg low-speed model airplane flying autonomously from takeoff, through a circuit, to landing. Guidance and control systems are established for the plane, and flight experiments verify that the control laws work well for all flight modes.
This paper studies a static output feedback control for linear time-varying collocated mechanical systems. The internal stability and L 2 gain control performance conditions are first derived by utilizing specific system structures. Then we propose a controller design algorithm based on linear matrix inequality to obtain gain-scheduled optimal feedback gains. Simple numerical studies are shown and discussed.
This paper proposes a design method of optimal DVDFB (direct velocity and displacement feedback) controller for attitude control of flexible spacecraft whose flexible solar paddles rotate at the orbital rate. The DVDFB controller with collocated sensors and actuators is known to be promising from the robust stability viewpoint even for such a linear parameter varying system. However, the optimal design method is not still well-developed. For this problem, we propose to design an optimal DVDFB controller gain based on LMI (linear matrix inequality) in the H ∞ control framework using GKYP (generalized Kalman-Yakubovich-Popov) lemma. Some numerical simulations are performed to demonstrate the ability.
The stability of linear time invariant mechanical systems described with second-order matrix differential equations has been well studied and design methods for static output feedback control have been proposed based only on sign-definiteness of closed-loop coefficient matrices. This paper extends the approach to more general class of time varying mechanical systems. For the purpose, we first derive the closed-loop stability and optimality conditions. We then propose a design method of scheduled optimal static output feedback gain matrices by solving a finite number of linear matrix inequalities. In order to verify the efficiency, some numerical studies are performed. Finally, by specifying the results to linear time invariant systems, we discuss their effectiveness compared with existing approaches.
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