波登管力反馈型2D压力伺服阀特性

摘要

设计了主要用于飞机刹车系统的2D压力伺服阀,其阀芯具有移动自由度和旋转自由度.将波登管作为压力反馈单元输出反馈力矩,与拨杆拨叉联动,实现与主阀的闭环力反馈,从而保持其压力输出恒定;分析了波登管力反馈机构的传力方式,建立了2D压力伺服阀的数学模型,仿真分析了主阀的静动态特性;设计了样机实验方案并搭建实验平台,实验结果表明:2D压力伺服阀输出压力与旋转电磁铁输入电流基本成线性关系,输出压力的阶跃响应时间约为18 ms.实验结果与仿真分析结果基本一致.%2D pressure servo valves mainly applied to aircraft brake systems were designed,whose spools had linear movements and rotary movements. Bourdon tube was used as pressure feedback unit, and the output feedback torques were linked with shift lever forks to realize the closed loop force feed-back with the main valves. Pressure outputs were kept constant. Force transfer method of Bourdon tube force feedback mechanism was analyzed,mathematical model of the 2D pressure servo valves was estab-lished,static and dynamic characteristics of the main valves were simulated and analyzed.A prototype ex-perimental program was designed,and an experimental platform was built. The experimentalal results show that the output pressures of the 2D pressure servo valves are basically linear with the input current of the rotating electromagnets,and the step response time of the output pressures is about 18ms.The ex-perimental results are basically consistent with the simulation ones.