运输机地面转弯轨迹跟踪滑模控制器设计及仿真

摘要

Attitude manoeuvrable and trajectory following are involved in flight control of transport aircraft in wide scope. Serious coupling of channels and external perturbation make more complicated for designing of trajectory following. The method (Sliding Mode Control,SMC)of robust decoupling of multi-variables tracking control is presented, which follows turning trajectory of transport aircraft in ground accurately. The equation of motion of turning trajectory is nonlinear and multi-inputs system, therefore, it is important for designing switch function of SMC. switch function is introduced based on Back-stepping approach, according to calculation and simulation, good accuracy of trajectory tracking is obtained.%大型运输机飞行控制包括较宽范围的姿态机动、轨迹跟踪.通道间高度耦合、外界条件干扰等条件使得轨迹跟踪控制设计变得较为复杂.为此,提出了一种鲁棒解耦的多变量跟踪控制方法——滑模控制方法,对运输机地面转弯轨迹进行了精确跟踪.运输机地面转弯轨迹运动学模型是一个多输入非线性系统,所以滑模控制中切换函数设计是很重要的.给出了Backstepping方法设计切换函数,通过对实例的计算仿真,滑膜控制对运输机轨迹跟踪具有较高的准确度.