Fluid-structure Coupling Analysis of Hydraulic Cylinder Based on Dynamic Mesh Technology

Abstract

Abstract: Aiming at problems of abrasion of guide sleeve and leakage of hydraulic fluid caused by offset load of hydraulic cylinder, the fluid-structure coupling simulations of hydraulic cylinders under offset load conditions were carried out based on dynamic mesh. Results indicate that, within the radius of friction circle, side thrust of plunger to guide sleeve，the maximum roll displacement of plunger and stress of guide sleeve increase with the increases of offset loads. When the amount of offset load is larger than the radius of friction circle, the three items decrease but still are larger than the results under steady conditions, which indicates that the hydraulic fluid “intensify” the rolls of plunger. Therefore, in the offset loading analyses and design of hydraulic cylinders, fluid-structure coupling technology is strongly recommended, or rationally increase the safety factor of steady structure analysis.

Key words: hydraulic cylinder, offset load, fluid-structure coupling, roll

摘要： 针对液压缸偏载引起的结构磨损及液压油泄漏等问题，基于动网格方法，开展了偏载工况下液压缸的双向流固耦合分析。研究表明：在自锁半径内，随偏载量增大，柱塞与导向套间的侧推力、柱塞最大侧倾位移和导向套应力均增大，偏载量超过自锁半径时，三者都有所减小，但均比稳态分析结果大，表明液压油对柱塞侧倾有“加剧”作用。因此，在液压缸偏载分析设计中，建议采用流固耦合方法，或适当增大稳态分析结果的安全系数。

关键词: 液压缸, 偏载, 流固耦合, 侧倾

CLC Number:

TH137

ZHANG Rui, JIANG Feng, YANG Jin, HU Tianwei, WANG Weiqiang. Fluid-structure Coupling Analysis of Hydraulic Cylinder Based on Dynamic Mesh Technology[J]. China Mechanical Engineering.

张瑞, 姜峰, 杨晋, 胡天威, 王卫强. 基于动网格的液压缸双向流固耦合分析[J]. 中国机械工程.

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