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提出了超低空空投下滑阶段的PIO问题,研究了空投下滑拉平阶段产生PIO的主要原因。基于描述函数法分析了速率限制反馈(RLF)PIO抑制系统的相位补偿能力和PIO产生机理,推导了抑制PIO发生的计算公式。应用RLF连续信号相位补偿法抑制PIO的发生,对阶跃、离散和正弦三种易于诱发PIO现象的跟踪任务进行了数值仿真。结果表明,超低空空投下滑拉平阶段会发生PIO,严重威胁飞行安全,RLF对PIO具有较好的抑制效果。
This paper presents the PIO problem during the dropping phase of the ultra-low-level airdrop and studies the main reasons for the PIO generation during the phase of the airdrop decline. Based on the descriptive function method, the phase compensation capability and PIO generation mechanism of rate limiting feedback (RLF) PIO suppression system are analyzed, and the formula to suppress the occurrence of PIO is deduced. Applying RLF continuous signal phase compensation method to suppress the occurrence of PIO, three step tracking, discrete and sine tracing tasks that are easy to induce PIO phenomenon are simulated. The results show that PIO occurs at the stage of low-altitude airdrop sliding and leveling, which threatens the flight safety seriously. RLF has good effect on PIO.