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现代电传飞行控制系统中由于作动器速率饱和产生的突然的附加相位滞后以及系统操纵增益的降低是触发非线性PIO的主要原因,对此通常采用相位补偿的方法进行抑制。为研究抑制器的抑制效能,建立了非线性的人机闭环系统模型。在分析基于前馈结构的DASA抑制器频域特性及其相位补偿能力的基础上,采用离散俯仰跟踪任务与正弦跟踪任务在时域内仿真研究了抑制器对PIO的抑制效能,结果表明该抑制器可以抑制非线性PIO。最后在地面飞行模拟器上进行了进一步验证,结果表明DASA抑制器可以改善飞机飞行品质,能用于PIO的抑制。
In modern fly-by-wire flight control systems, the sudden additional phase lag due to saturation of the actuator speed and the reduction of system operating gain are the main reasons for triggering non-linear PIO, which is usually suppressed by the phase compensation method. In order to study the suppression performance of the suppressor, a nonlinear human-machine closed-loop system model was established. Based on the analysis of the frequency-domain characteristics and the phase compensation ability of the DASA suppressor based on the feedforward structure, the suppression performance of the suppressor on the PIO is simulated in the time domain by the discrete pitch tracking task and the sinusoidal tracking task. The results show that the suppressor Non-linear PIO can be suppressed. Finally, the ground flight simulator was further verified, the results show that DASA suppressor can improve the quality of aircraft flight, can be used for PIO suppression.