逐点线性化后退区间最优控制在飞机非线性控制中的应用

常规线性飞控系统针对推力矢量飞机这样的多控制冗余、非线性MIMO系统,无法实现非线性控制．本文针对推力矢量飞机非线性系统,阐述了一种逐点线性化后退区间最优控制算法满足飞行品质要求．首先将作动器,飞行品质和逐点线性化的飞机线性模型综合实现在线建模,然后以飞行状态与预测状态之间的误差、作动器的位置限制和速率限制作为最优指标,最后以此为基础,根据最优控制原理计算当前时刻飞机最优控制指令,实现飞机非线性控制．采用国内某型号飞机气动数据验证此算法的鲁棒性和稳定性．

LSPRHO algorithms for the nonlinearmovement of aircraft with thrust vector

Conventional linearflight control systems do not satisfy nonlinear control requirement of aircraft with thrust vector, which is a multiple control redundances and nonlinear MIMO system. To control an aircraft with thrust vector, an algorithm of LSPRHO(linearization method at sampling point && receding horizon optimal control) is set forth. Firstly, actuators, flight quality models and the approximate linear equations at sampling points can be effectively combined into an augmented time-invariant linear system, then LSPRHO takes errors and error rates between fly-states and model-states, actuators position limit and rate limit as optimal index. Based on the above deductions and the optimization technique, the control input for aircraft can be determined to make fly-states to track the state commands. The algorithm is provedto be robust and stable by simulations with air dynamic data of certain native aircrafts.