开关型飞行员诱发振荡抑制器研究

On Switching Suppresser for Restraining Pilot Induced Oscillations

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 rate limiter is saturated in flight control systemtime delay would occur.The pilot induced oscillations （PIO） may come into being on condition that the pilot operates incorrectly.A simplified model of rate limiter was establishedand the switching suppresser designed by using logical conditions method was anatomized.The response properties of the openloop frequency and phase compensation ability of the suppresser were studied by using describing function.The openloop response properties of the suppresser to sine wave and bias input were discussed.A switching suppresser to prevent PIO was proposedand a mathematical model of closedloop aircraftpilot system with the derivative switching suppresser was set up.The step tracking tasks were simulated to study the performance the switching suppresser and DASA anticipatory control suppresser.The simulating results demonstrate that derivative switching suppresser effectively reduces the possibility of PIO.