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当舵机速率限制饱和时会产生附加时延,恶化飞行品质,触发Ⅱ型驾驶员诱发振荡(PIO)。运用描述函数法研究速率限制反馈(RLF)和死区增稳(DASA)Ⅱ型PIO抑制系统的开环相位补偿能力,提出RLF抑制系统的参数优化选择方法,分析了DASA抑制系统中死区和滤波器参数对相位补偿能力的影响。研究了两型抑制系统对正弦与偏差输入信号的开环响应特点。建立了含速率限制器的人机系统数学模型,基于描述函数法探究了Ⅱ型PIO的产生机理,推导了抑制Ⅱ型PIO发生的公式,应用连续信号相位补偿法抑制Ⅱ型PIO的发生。对阶跃、离散和正弦3种易于诱发PIO现象的跟踪任务进行数值仿真,对比了两种抑制系统的Ⅱ型PIO抑制能力。结果表明,反馈型RLF抑制系统对Ⅱ型PIO的抑制能力强于前馈型DASA抑制系统,有效降低了Ⅱ型PIO发生的可能性。
Saturation of the servo speed limits creates additional delays, degrading the flight quality and triggering Type II driver-induced oscillations (PIOs). Using the description function method to study the open-loop phase compensation ability of Type II PIO suppression system of rate limiting feedback (RLF) and dead-zone augmentation stabilization (DASA), a method for parameter optimization selection of RLF suppression system is proposed. Effect of Filter Parameters on Phase Compensation Capability. The open-loop response characteristics of two types of suppression systems to sinusoidal and biased input signals are studied. The mathematical model of human-machine system with speed limiter was established. Based on the descriptive function method, the generation mechanism of type II PIO was explored. The formula to suppress the occurrence of type II PIO was derived. The occurrence of type II PIO was suppressed by continuous signal phase compensation. The numerical simulation of step, discrete and sine tracing tasks that are apt to induce PIO phenomenon is compared with that of Ⅱ inhibitory system of PIO. The results show that the feedback type RLF suppression system is better than the feedforward type DASA suppression system for type Ⅱ PIO, which effectively reduces the possibility of type Ⅱ PIO.