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research-article

Heat characteristics analysis of electro-hydraulic servo valve

[+] Author and Article Information
Zhu Yannan

Department of Mechanical Engineering, Shanghai Jiao Tong University, 800 Dongchuan RD. Minhang District, Shanghai, China, 200240
zhuyn_sjtu@126.com

Zhang Qiang

Department of Mechanical Engineering, Shanghai Jiao Tong University, 800 Dongchuan RD. Minhang District, Shanghai, China, 200240
xtxkjy@163.com

Jianfeng Tao

Department of Mechanical Engineering, Shanghai Jiao Tong University, 800 Dongchuan RD. Minhang District, Shanghai, China, 200240
jftao@sjtu.edu.cn

Tan Dun

Department of Mechanical Engineering, Shanghai Jiao Tong University, 800 Dongchuan RD. Minhang District, Shanghai, China, 200240
18844502766@163.com

Wang Xuyong

Department of Mechanical Engineering, Shanghai Jiao Tong University, 800 Dongchuan RD. Minhang District, Shanghai, China, 200240
xywang@sjtu.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4041880 History: Received May 27, 2018; Revised October 22, 2018

Abstract

A new method of building electro-hydraulic servo valve's thermal model is proposed. In this method, coupled pressure and temperature equations inside control volume were deduced based on fluid mass continuity equation and energy conservation equation; relationship among servo valve's heat conduction, heat convection and heat radiation was also obtained according to thermodynamics. Servo valve's thermal model and thermal characteristics model were built and simulated in AMESim. Experiment was carried out in four working pressures ranging from 3MPa to 12MPa. Simulation and experimental results indicate that valve reaches thermal equilibrium in less than 2.5 hours, and with pressure's increase, valve reaches thermal equilibrium more quickly. Maximum and steady temperature error between simulation and experimental results are approximately 5.2°C and 1.8°C, and when lowering pressure, they both reduce. The temperature error can mainly result from motor's heat production in experiment, which will vanish when the whole hydraulic motor servo system is modeled. Therefore, experimental results verified the validity of valve's thermal characteristics model. The significance of this study is to provide a theoretical basis for subsequent researches of thermal characteristics of other hydraulic components, which include hydraulic motor, valve block, hydraulic oil source and so on.

Copyright (c) 2018 by ASME
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