基于脉宽调制的反作用控制系统技术

Control technology based on Pulse Width Modulation of RCS

摘要:

反作用控制系统(RCS)技术是高超声速飞行器再入初期主要的姿态控制手段，与常规舵面操纵相比，RCS输出为一离散力矩，这给连续系统控制带来困难。基于RCS的离散工作特性，采用脉宽调制(PWM)技术设计控制器。首先把RCS当作连续力矩输出，在连续系统控制下进行姿态反馈律设计。然后再根据脉宽调制算法把连续的控制量调制成离散控制量，控制RCS开启状态和开启时间。并根据离散控制理论分析了PWM控制器的稳定性。仿真结果表明，PWM控制器能够保证控制的稳定性和±1°姿态控制精确度，并较好地实现RCS对飞行器姿态运动的控制。

Abstract:

Reaction Control System(RCS) is the principal execution part to control the attitude of hypersonic UAV at the early reentry. Compared with the conventional rudder control, the output of RCS is a discrete torque, which will cause difficulties to the continuous system control. Based on the discrete characteristics of RCS，Pulse Width Modulation(PWM) technology is employed to design controller. First，RCS is taken as a continuous torque output, and the attitude feedback law is designed in the continuous system. Then，the continuous control values are modulated into discrete control values based on PWM algorithm in order to control the open state and open time of RCS. The stability of the PWM controller is analyzed according to the discrete control theory. The simulation results show that the PWM controller can ensure the control stability and the accuracy between 1° and -1°，and can achieve the control on aircraft attitude with RCS.