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Research Papers

Heat Characteristics Analysis of Electro-Hydraulic Servo Valve

[+] Author and Article Information
Yannan Zhu

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

Qiang Zhang

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

Jianfeng Tao

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

Dun Tan

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

Xuyong Wang

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

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received May 27, 2018; final manuscript received October 22, 2018; published online January 29, 2019. Assoc. Editor: Cheng-Xian Lin.

J. Thermal Sci. Eng. Appl 11(3), 031008 (Jan 29, 2019) (6 pages) Paper No: TSEA-18-1274; doi: 10.1115/1.4041880 History: Received May 27, 2018; Revised October 22, 2018

A new method of building electro-hydraulic servo valve's thermal model is proposed. In this method, energy conservation equation of servo valve was obtained according to thermodynamics, which describes servo valve's heat conduction, heat convection, and heat radiation with other hydraulic components. 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 3 MPa to 12 MPa. Simulation and experimental results indicate that servo valve reaches thermal equilibrium in less than 2.5 h, and with pressure's increase, valve reaches thermal equilibrium more quickly with a higher steady temperature. Maximum and steady temperature error between simulation and experimental results are approximately 4.6 °C and 1.5 °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 heat characteristics of other hydraulic components, which include hydraulic motor, valve block, hydraulic oil source, and so on.

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Figures

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Fig. 1

Schematic diagram of power stage spool valve in servo valve

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Fig. 2

Thermal model of electro-hydraulic servo valve

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Fig. 3

Thermal characteristics model of electro-hydraulic servo valve

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Fig. 4

Diagram of servo valve's temperature and time

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Fig. 5

Diagram of servo valve's thermal power and time

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Fig. 6

Diagram of hydraulic motor servo system's experimental equipment

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Fig. 7

Diagram of valve's temperature and time in different working pressures: (a) P = 3 MPa, (b) P = 6 MPa, (c)P = 9 MPa, and (d) P = 12 MPa

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Fig. 8

Diagram of valve's temperature error and time

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