Valving Land Phenomena of the Innas Hydraulic Transformer

2000 ◽  
Vol 1 (1) ◽  
pp. 39-47 ◽  
Author(s):  
Peter A. J. Achten ◽  
Zhao Fu
Keyword(s):  
Hydraulic Transformer

Fractional order PID Based Control Strategy for the Valve Plant of Hydraulic Transformer

2012 ◽  
Vol 203 ◽  
pp. 46-50
Author(s):  
Shu Nan Liu ◽  
Dan Tong Xie ◽  
Shu Qiang Jia ◽  
Tao Shang ◽  
Yong Ming Yao ◽  
...  
Keyword(s):  
Fractional Order ◽  
Control Strategy ◽  
Fuzzy Logic Controller ◽  
Differential Evolution Algorithm ◽  
Pressure Control ◽  
Step Response ◽  
Fuzzy Pid Control ◽  
Output Pressure ◽  
Hydraulic Transformer ◽  
Fractional Order Pid

Aiming at the pressure control of hydraulic transformer (HT), the fractional order PID (FOPID) controller is proposed for the control of the position of the valve plate. The assignment system of the HT is carefully modeled. To optimally determine the parameters of the FOPID controller, a self-adapting differential evolution algorithm is employed. Numerical simulation is conducted to investigate the proposed control strategy. Both step response and sinusoidal command signal tracking of the servo system is assessed, and the results demonstrate that the proposed control strategy is obviously superior to the conventional PID, Fuzzy Logic Controller (FLC) and fuzzy-PID control strategy, and can afford precise tracking performances. It is suitable for the precise adjustment of the output pressure of the HT.

Displacement Characteristics of Variable Hydraulic Transformer

2014 ◽  
Vol 543-547 ◽  
pp. 741-746 ◽  
Author(s):  
Guan Zhong Yang ◽  
Ji Hai Jiang
Keyword(s):  
Flow Rate ◽  
Load Flow ◽  
Hydraulic Transformer ◽  
Swash Plate

A new kind of hydraulic transformer, called variable hydraulic transformer (VHT), has been proposed to control its load flow rate. The displacement characteristics of VHT are investigated in detail. The mathematic models are concluded and optimized. Matlab is used to simulate and calculate, finding that there are 5 controlled angles of the port plate that can help define displacement characteristics of VHT. The relationships between the displacement characteristics and the structure in VHT are shown. The results demonstrate the performance laws of VHT when the controlled angles of the port plate and of the swash plate change.

Flow characteristics of variable hydraulic transformer

2015 ◽  
Vol 22 (6) ◽  
pp. 2137-2148 ◽  
Author(s):  
Guan-zhong Yang ◽  
Ji-hai Jiang
Keyword(s):  
Flow Characteristics ◽  
Hydraulic Transformer

scholarly journals Robust Position Control of Cylinder Using Hydraulic Transformer

2005 ◽  
Vol 36 (2) ◽  
pp. 45-50
Author(s):  
Shigeru IKEO ◽  
Weidong MA ◽  
Kazuhisa ITO
Keyword(s):  
Position Control ◽  
Hydraulic Transformer

Four-port hydraulic transformer with inlet and outlet equal flow and its flow characteristics

2021 ◽  
pp. 095440622110316
Author(s):  
Chu Zhang ◽  
Lianquan Zhou ◽  
Xiaonan Bo ◽  
Weiwei Qu ◽  
Panpan Zang
Keyword(s):  
Theoretical Analysis ◽  
Flow Rate ◽  
Hydraulic System ◽  
Measurement Data ◽  
Flow Characteristics ◽  
Remarkable Feature ◽  
Flow Rates ◽  
Instantaneous Flow ◽  
Hydraulic Transformer ◽  
System A

Without changing the original valve control hydraulic system, a kind of hydraulic transformer, called four-port hydraulic transformer (FHT), is proposed to recover the energy loss caused by system throttling. The remarkable feature of FHT is that the flow rate at inlet and outlet ports are equal. This means that FHT can be connected into the load circuit of hydraulic system to recovery energy without refreshing flow rate. This paper investigates the flow characteristics of FHT, including instantaneous flow rates, average flow rates and flow pulsations in each port. The relationships between the structure of port plate and the flow characteristics are given. The variation rule of number of plungers connected to four ports is shown, and the relationship between the variation and the flow pulsation is revealed. The simulation results show that the flow rates and displacements of symmetrical ports are same, and the instantaneous flow rate of symmetrical ports has the same rule. The results also show the frequent changes of the number of plungers connected with each port lead to more flow jump points in instantaneous curves, and the jump point is the basic cause of its loud noise. The test shows that the flow rates of measurement data of the experiment are very close to the theoretical analysis, proved the theoretical analysis of flow characteristics for FHT are appropriate and reasonable, which has a certain reference for the development and energy-saving application for FHT.

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