摘要
针对电液伺服机构安装到运载火箭后存在非工作状态下承受外力并产生被动运动的现状,分析伺服机构的受力情况并构建内部液体流动回路,研究非工作状态下伺服机构在外力作用时的运动特性。发现伺服阀零位特性以及伺服机构高压回路密封性能是影响伺服机构非工作状态下运动特性的主要因素。在外力作用下发生运动时油缸某一侧往往处于抽真空状态。使用零位特性良好的伺服阀以及高压回路泄漏小的伺服机构,在外力作用下将处于双向不动或单向可动的状况。利用典型产品开展了物理试验,验证了结论的有效性。
The electro-hydraulic servo mechanism bears external force and generates passive motion under the nonworking condition after being installed into a launch vehicle. A thorough analysis of the motion characteristics of a servo mechanism under the action of external force in the non-working state is presented. The results show that the zero position characteristic of the servo valve and the sealing performance of the high-pressure loop of a servo mechanism are the main factors affecting the motion characteristics of the servo mechanism under the non-working condition. When the motion occurs under the action of external force,one side of the cylinder is often in the state of vacuum pumping. The servo valve with good zero position characteristics,and the servo mechanism with small leakage in the high-pressure loop will be in bidirectional immobility or unidirectional movability state under the action of external force. The validity of the conclusion is verified by the physical test of typical products.
作者
傅俊勇
夏忠
郭加利
FU Jun-yong;XIA Zhong;GUO Jia-li(Shanghai Institute of Spaceflight Control Technology, Shanghai 201109, China;Shanghai Engineering Research Center of Servo System, Shanghai 201109, China)
出处
《宇航学报》
EI
CAS
CSCD
北大核心
2019年第8期957-964,共8页
Journal of Astronautics
关键词
电液伺服机构
电液伺服阀
推力矢量控制
运载火箭
运动分析
Electro-hydraulic servo mechanism
Electro-hydraulic servo valve
Thrust vector control
Launch vehicle
Kinematic analysis
