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

LSPRHO algorithms for the nonlinearmovement of aircraft with thrust vector

中文关键词  逐点线性化后退区间最优控制  推力矢量飞机  非线性控制  增广定常线性系统  鲁棒性和稳定性

英文关键词  LSPRHO  aircraft with thrust vector  nonlinear control  the augmented time-invariant linear system  robust and stable

中文摘要

      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.

英文摘要

      Conventional linear flight 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 proved to be robust and stable by simulations with air dynamic data of certain native aircrafts.