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考虑管路的飞机液压刹车系统压力振荡分析

, PP. 210-215

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Abstract:

飞机液压刹车系统通常采用压力伺服阀控制刹车压力,由于布局限制,压力伺服阀和刹车作动器之间往往存在较长的液压管路.管路会给系统引入欠阻尼的频率特性,而且该特性会与压力伺服阀固有的局部压力闭环结构相耦合,使得压力伺服阀的输出压力容易出现振荡、失稳现象.因此通过在飞机液压刹车系统建模中考虑管路模型,在频域上分析了压力伺服阀与管路、容腔耦合的现象和原因,具体给出了管路参数和油液参数变化对压力闭环的影响,并通过时域仿真进一步验证了频域分析的结论.同时分析了匹配设计管路、增加系统阻尼和降低系统增益3种避免压力闭环控制振荡失稳的方法.为飞机液压刹车系统的设计与优化提供了理论参考依据.

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