QFT control based on zero phase error compensation for flight simulator

To improve the robustness of high-precision servo systems, quantitative feedback theory （QFT） which aims to achieve a desired robust design over a specified region of plant uncertainty is proposed. The robust design problem can be solved using QFT but it fails to guarantee a high precision tracking. This problem is solved by a robust digital QFT control scheme based on zero phase error （ZPE） feed forward compensation. This scheme consists of two parts： a QFT controller in the closed-loop system and a ZPE feed-forward compensator. Digital QFT controller is designed to overcome the uncertainties in the system. Digital ZPE feed forward controller is used to improve the tracking precision. Simulation and real-time examples for flight simulator servo system indicate that this control scheme can guarantee both high robust performance and high position tracking precision.

无人直升机前飞段抗侧风的控制技术研究

前飞段飞行能力是无人直升机进行超视距飞行的基础,而侧风是影响无人直升机前飞段飞行安全的一个重要因素,因此前飞段的抗侧风策略制约着无人直升机的超视距飞行能力。目前,无人机主流的两种前飞抗侧风策略是侧滑法和侧航法。侧滑法是通过飞机的滚转来抵抗侧风对飞机产生的侧力,飞行中一直存在侧滑角;侧航法则是将航向偏转至空速方向来消除侧风产生的侧滑,实现无侧滑的飞行。从这两种方案着手,设计了4种前飞段抗侧风方案,并进行了对比分析,来分别满足不同的工程需求。