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中南大学学报(自然科学版)

Journal of Central South University

第51卷    第6期    总第310期    2020年6月

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文章编号:1672-7207(2020)06-1509-09
并联双杆液压缸偏载力和径向力分析
訚耀保1,李双路1,陆畅2,原佳阳1,肖强2

(1. 同济大学 机械与能源工程学院,上海,200092;
2. 中国航发长春控制科技有限公司,吉林 长春,130102
)

摘 要: 针对矢量喷管发动机采用的并联双杆液压缸存在不均匀磨损和运动抖动的问题,建立液压缸数学模型和等效静力学模型,研究不同负载、不同阀口开度下偏载力以及活塞与缸筒、活塞杆与导向套之间的径向力变化情况。研究结果表明:当外负载一定时,偏载力与阀口开度近似呈二次函数关系;当阀口开度一定时,偏载力与外负载呈线性关系;在空载条件下,偏载会对2根活塞杆的运动顺序产生影响;在外负载作用下,并联结构的形变导致径向力的产生,2根活塞杆的轴向偏载对径向力影响较小;活塞与缸筒之间的径向力随活塞杆伸出长度增大而增大,活塞杆与导向套之间的径向力随活塞杆伸出长度增大先减小再增大;并联液压缸之间的串联孔面积越大,2根活塞杆的轴向偏载力越小;采用增大连接块厚度或者采用高弹性模量的材料可以有效地降低液压缸的径向力。关于偏载力对2根活塞杆运动顺序的影响,实验结果与理论结果相符。

 

关键字: 双杆液压缸;偏载力;径向力;运动状态;超静定结构

Analysis of offset load force and radial force of parallel double rods hydraulic cylinder
YIN Yaobao1, LI Shuanglu1, LU Chang2, YUAN Jiayang1, XIAO Qiang2

1. School of Mechanical Engineering, Tongji University, Shanghai 200092, China;
2. China Aero-Engine Changchun Control Technology Co. Ltd., Changchun 130102, China

Abstract:Aiming at the problem of uneven wear and jitter in parallel double rods hydraulic cylinder of aircraft vector nozzle engine, the mathematical model and equivalent statics model of the cylinder were established. The variation of radial force between piston and cylinder, piston rod and guide sleeve as well as offset load force under different loads and valve openings were studied. The results show that when the external load is constant, the offset load force has a quadratic function relationship with the valve opening. When the valve opening is constant, the offset load force has a linear relationship with the external load. And the offset load force affects the motion order of the two piston rods under the condition of no load. The deformation of parallel structures under external loads results in radial forces, and the offset load force has little influence on the radial force. When the piston rod extends, the radial force between the piston and the cylinder increases gradually, while the radial force between the piston rod and the guide sleeve decreases first and then increases. The larger the area of series holes between parallel hydraulic cylinders is, the smaller the axial bias load of the two piston rods is. The radial force of hydraulic cylinder can be effectively reduced by increasing the thickness of connecting block or adopting the material with high elastic modulus. Concerning the influence of offset load force on the motion order of two piston rods, the theoretical results are consistent with the experimental results.

 

Key words: double rods hydraulic cylinder; offset load force; radial force; motion state; statically indeterminate structure

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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