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舵机速率限制是现代数字电传飞机发生PIO事件的最主要诱发因素之一。利用描述函数法分析了舵机速率限制诱发PIO的机理;通过滑动窗口傅立叶变化法提取了PIO的特征值,基于直接逻辑设计了在线PIO探测算法;分析了DS抑制器、陷波抑制器的工作原理。地面模拟器的仿真验证结果表明,所提出的PIO探测算法和主动抑制方法正确、可行,可为PIO飞行试验提供理论基础。
Servo rate limiting is one of the most important triggers for PIO events in modern digital teletype aircraft. The mechanism of induced PIO induced by the steering rate restriction was analyzed by the description function method. The PIO eigenvalue was extracted by the sliding window Fourier transform method. The on-line PIO detection algorithm was designed based on direct logic. The operation of DS suppressor and notch suppressor principle. Simulation results of ground simulator show that the proposed PIO detection algorithm and active suppression method are correct and feasible, which can provide theoretical basis for PIO flight test.