• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2018, Vol. 54 ›› Issue (10): 225-232.doi: 10.3901/JME.2018.10.225

• 交叉与前沿 • 上一篇    

壁孔回中式液压作动器机理与应用研究

朱康武, 房成, 纪宝亮, 傅俊勇   

  1. 上海航天控制技术研究所 上海 201109
  • 收稿日期:2017-06-09 修回日期:2018-01-10 出版日期:2018-05-20 发布日期:2018-05-20
  • 通讯作者: 傅俊勇(通信作者),男,1971年出生,硕士,研究员,硕士研究生导师。主要研究方向为运载火箭伺服系统设计。E-mail:julong@163.com
  • 作者简介:朱康武,男,1983年出生,博士,高级工程师。目前主要研究方向为运载火箭高可靠性电液伺服系统。E-mail:zjuzkw@zju.edu.cn
  • 基金资助:
    民用航天“十二五”技术预先研究资助项目(科工技[2013]669)。

Theoretical Study and Application on the Hydraulic Actuator with Holes in Wall

ZHU Kangwu, FANG Cheng, JI Baoliang, FU Junyong   

  1. Shanghai Institute of Spaceflight Control Technology, Shanghai 201109
  • Received:2017-06-09 Revised:2018-01-10 Online:2018-05-20 Published:2018-05-20

摘要: 针对新一代运载火箭推力矢量控制系统在故障后需要紧急回中的实际问题和困难,提出一种基于液阻网络原理的新型壁孔回中式液压作动器。该作动器无需控制系统控制,也无需辅助作动器提供外力即可实现作动器的自动回中。完整给出壁孔回中式液压作动器的设计原理和设计方法。使用液阻网络原理,对其工作机理进行分析,获得了系统的压力增益和负载刚度等关键特性的解析解。建立作动器的仿真模型,并开展对比仿真研究。研制原理样机,通过优化设计解决了回中孔对活塞密封圈造成损坏的问题。通过对比试验研究,验证了多孔型和长方型两种壁孔的实际回中效果。试验结果表明,两种形式的壁孔均可实现作动器的自动回中。并且回中精度高,运动稳定,在零位附近没有出现振荡现象。仿真和试验结果均表明:回中孔面积越大,回中速度越快;负载越大,回中速度越慢,离开中位的偏移量增大。通过对工作50 h后的作动器进行分解,证明回中孔确实会对密封圈造成一些微小的损坏,但通过使用本文所提出的优化设计方法,可以大大降低甚至消除回中孔对密封件的损坏,从而满足作动器的寿命要求。

关键词: 壁孔回中, 伺服机构, 液压缸, 液压作动器, 液阻网络

Abstract: A new hydraulic actuator with holes in wall based on the principle of hydraulic resistance network which can push or pull the piston to the central position in case of emergency is proposed. The new actuator can be used in the thrust vector control (TVC) system of next generation launch vehicles, and realize the safe centering function after the failure of TVC system. The actuator can realize auto-centering function without electrical control system, position sensor and external force. The design principle and detailed design method are given. By hydraulic resistance network method, the working principle of system is analyzed, and the analytic solutions of pressure gain and load stiffness are obtained. A simulation model is established, and comparative studies are completed. A prototype actuator is produced, and the damage of holes to seal ring is eliminated by optimal design. By comparative experimental studies, the actual auto-centering performances of multi-holes and rectangle holes are tested. The results indicate that these two holes type both can realize the auto-centering function, the control accuracy is high, the movement is stable, and there is no oscillation around the center position. Both simulation and experimental results show that the larger area of hole is, the faster of centering speed will be. And with the increasing of load, the centering speed will be slowly while the offset to center position will be bigger. After 50 h of work, the actuator is aparted and it is proved that the holes in wall do cause some tiny damages to seal ring, however, the working life of actuator can still be guaranteed for the damage can be reduced or even eliminated by some optimal design methods such as using the multi-holes and thickened grid ring proposed in this paper.

Key words: holes in wall, hydraulic actuator, hydraulic cylinder, hydraulic resistance network, servo mechanism

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