轨控式直/气复合控制导弹过载指令动态分配设计

Design of Dynamic Allocation of Overload Command for Orbital Blended Control Missile with Thrust and Aerodynamics

为更好地将过载指令协调分配给各执行机构,实现复合控制导弹的有效跟踪,提出一种过载指令动态分配策略.首先,建立轨控式直/气复合控制导弹俯仰通道数学模型,并对执行机构进行解耦.将过载指令1阶导数作为参考因素,设计了不同过载指令变化速率下直接力与气动力间过载的动态协调分配策略.然后,考虑气动过载跟踪时弹体姿态变化问题,设计了滑模控制器来跟踪气动过载并稳定弹体姿态.仿真结果表明,所设计的指令分配策略可实现过载的快速跟踪,与现有硬切换分配策略相比,跟踪精度提高了近4倍.

To allocate the control commands between the direct force and aerodynamics and to ensure a better tracking effect in the blended control system, we propose an overload-command dynamic-allocation strategy. First, we establish a mathematical model of the pitching channel in the orbital blended control missile in which the direct force and aerodynamic actuator are decoupled. The dynamic and coordinated allocation strategy for the direct force and aerodynamics is designed using the first-order derivative of the overload command. Secondly, considering the attitude change of the missile body during aerodynamic overload tracking, we designed a sliding mode controller to track the aerodynamic overload and stabilize the attitude of the missile. Our simulation results show that the actuator can quickly track the given overload command using the designed allocation strategy and the tracking accuracy is improved fourfold in comparison with that of the current hard switch strategy.