导弹的直接力与气动力复合控制分配算法研究

Research on Control Allocation Algorithm for Missile with Lateral Jet and Aerodynamic Surfaces

在导弹稳定性优化控制的研究中,针对直接力/气动力复合控制导弹两个子系统之间的控制分配问题,建立了复合控制导弹的数学模型,根据控制律和控制分配分离设计的原则,提出一种新的控制分配算法。首先根据弹目相对距离与过载跟踪误差的变化情况,采用模糊控制理论为直接力和气动力子系统分别设计了一种控制分配算法,避免了不确定干扰对系统的影响;然后针对模糊控制精度较低的问题,采用自适应遗传算法对分配参数进行了优化,提高了分配参数的精度。仿真结果表明,导弹能较快地响应过载指令,所设计的控制分配算法能有效协调直接力与气动力子系统,导弹飞行状态平稳,没有造成姿控发动机反复点火。

Aiming at the problem of control allocation between two subsystems of missile with lateral jet and aerodynamic surfaces, the mathematical model of missile was developed, and a new control allocation algorithm was proposed according to the separation design of control law and control allocation algorithm. Firstly, according to the change of relative distance and overload tracking error, a control allocation algorithm based on fuzzy control theory was designed for each subsystem which avoided the influence caused by uncertain interference. Then, in order to improve the accuracy of fuzzy controller, adaptive genetic algorithm was used to optimize allocation parameters which improved the precision of allocation parameters. The simulation results show that, the missile can respond the overload command quickly, the control allocation algorithm can coordinate two subsystems effectively, the missile＇s flight status is smooth, and the attitude control engines do not work repeatedly.