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飞行控制系统中的速率限制饱和后会产生时延,此时若飞行员处置不当,可能触发飞行员诱发振荡。建立了简化的速率限制器模型,剖析了以逻辑条件法设计的开关型抑制器结构;运用描述函数法研究了开关型抑制器的开环频域响应特性及相位补偿能力;研究了开关型抑制器对正弦和偏差输入信号的开环响应特点,提出应用开关型抑制器抑制飞行员诱发振荡;建立了含开关型抑制器的人机闭环系统数学模型,通过阶跃跟踪任务数值仿真,对比了开关型抑制器与DASA前馈抑制器的性能。仿真结果表明,开关型抑制器是有效的,降低了飞行员诱发振荡发生的可能性。
When the rate limit in the flight control system is saturated, there will be a delay. If the pilot mishandles at this moment, it may trigger the pilot to induce oscillation. A simplified rate limiters model is established, and the structure of switch-type suppressors designed by logic condition method is analyzed. The open-loop frequency-domain response characteristics and phase compensation capability of the switch-type suppressors are described by the description function method. The characteristics of open-loop response of the input signal to the sine and the deviation are presented. The switch-type suppressor is used to suppress pilot-induced oscillation. A mathematical model of human-machine closed-loop system with switching suppressors is established. Type Suppressors and DASA Feedforward Suppressors. The simulation results show that the switch suppressor is effective and reduces the possibility of pilots inducing oscillations.