Transactions of Nanjing University of Aeronautics & Astronautics
Control for Underactuated Reentry Aircraft in Small Angle of Attack
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Abstract:
The control problem for underactuated reentry vehicle like HTV2 is considered with small angle of attack. The control strategy for an aircraft with positive lateral control departure parameter relies on strong lateral stability, which declines with the decrease of the angle of attack. Thus, to control the lateraldirectional motion in a stable state is hard and even impossible in some scenarios where the underactuated reentry vehicle, like HTV2, flies in a low angle of attack. To address this problem, the lateraldirectional openloop motion characteristics are analyzed. The results show that in an uncontrolled state, the lateraldirectional motion can automatically converge to stabilization thanks to the aerodynamic damping effect. Therefore, a method of turningoff the lateraldirectional control and inviting aerodynamic damping to control can achieve stability. The sixdegreeoffreedom simulation show that the lateraldirectional motion can be stabilized by the aerodynamic damping, and the lateral position error caused by the bank angle deviation is limited near the zerorise angle of attack. The control strategy is effective.
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