防止Ⅱ型驾驶员诱发振荡技术的研究

许多严重的飞行事故都与由速率限制引起的Ⅱ型PIO有关。针对如何预防PIO，首先介绍了自适应杆增益和软件限制环节的设计原理。然后以某带速率限制的电传飞机为例，运用同一理论，分析采用自适应杆增益和软件限制环节来改善速率限制的不利影响。仿真结果表明，自适应杆增益环节和软件限制环节都能抑制住PIO的发生，但两者组合加入抑制效果更好，飞行品质也能达到满意的程度。

Methods for Alleviating Pilot-Induced Oscillation with Actuator Rate Limiting

Closed loop instability caused by excess phase lag induced by actuator rate limiting has been suspected in many aircraft departures from controlled flight and pilot induced oscillations. Adaptive stick-gain and software rate limit were developed to minimize the phase lag induced by rate limiting. Adaptive stick-gain was evaluated on the pilot command path and using a software rate limit with and without adaptive stick-gain before actuator rate limit. Simulation results showed they were useful in preventing PIO. However, adaptive stick-gain plus software rate limit combination resulted in more PIO protection than either of them.