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Flow characteristics of variable hydraulic transformer

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Abstract

A new kind of hydraulic transformer, called variable hydraulic transformer (VHT), is proposed to control its load flow rate. The hydraulic transformer evolves from a pressure transducer to a power transducer. The flow characteristics of VHT, such as its instantaneous flow rates, average flow rates, and flow pulsations in the ports, are investigated. Matlab software is used to simulate and calculate. There are five controlled angles of the port plate that can help to define the flow characteristics of VHT. The relationships between the flow characteristics and the structure in VHT are shown. Also, the plus-minus change of the average flow rates and the continuity of the instantaneous flow rates in the ports are presented. The results demonstrate the performance laws of VHT when the controlled angles of the port plate and of the swash plate change. The results also reveal that the special principle of the flow pulsation in the ports and the jump points of the instantaneous curves are the two basic causes of its loud noise, and that the control angles of the port plate and the swash plate and the pressures in the ports are the three key factors of the noise.

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Authors and Affiliations

  1. Department of Fluid Power Control and Automation, Harbin Institute of Technology, Harbin, 150080, China

    Guan-zhong Yang  (杨冠中) & Ji-hai Jiang  (姜继海)

Authors
  1. Guan-zhong Yang  (杨冠中)
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  2. Ji-hai Jiang  (姜继海)
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Corresponding author

Correspondence to Ji-hai Jiang  (姜继海).

Additional information

Foundation item: Projects(50875054, 51275123) supported by the National Natural Science Foundation of China; Project(GZKF-2008003) supported by the Open Foundation of State Key Laboratory of Fluid Transmission and Control, China

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Yang, Gz., Jiang, Jh. Flow characteristics of variable hydraulic transformer. J. Cent. South Univ. 22, 2137–2148 (2015). https://doi.org/10.1007/s11771-015-2738-9

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  • DOI: https://doi.org/10.1007/s11771-015-2738-9

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