Theoretical and experimental studies on the steady-state performance of low-speed high-torque hydrostatic drives. Part 1: Modelling

2009 ◽  
Vol 223 (11) ◽  
pp. 2663-2674 ◽  
Author(s):  
S K Mandal ◽  
K Dasgupta ◽  
S Pan ◽  
A Chattopadhyay
Keyword(s):  
Steady State ◽  
Experimental Studies ◽  
Open Circuit ◽  
State Variables ◽  
Hydraulic Motor ◽  
Low Speed ◽  
Compression And Expansion ◽  
Loss Coefficients ◽  
High Torque ◽  
State Models

In this article the steady-state models of an open-circuit and a closed-circuit hydrostatic transmission (HST) drive have been developed to study their performances. A low-speed high-torque multi-stroke cam plate type radial piston motor is considered for both HST drives. Bondgraph simulation technique has been used to model the drives. The multi-bondgraph representation of the HST drives is presented; it takes into account the compression and expansion phases, which occur sequentially in the hydraulic motor. A reduced bondgraph model of the drives has been proposed, where various losses are lumped into suitable resistive elements. The relationships of the loss coefficients with other state variables, obtained from the reduced model, are identified through experimental investigation. The loss coefficients are found to have a non-linear relationship with the load torque and the supply flowrate. Using the characteristics of these loss coefficients, the steady-state performances of the hydrostatic drives are studied in Part 2 of this article (pg. 2675 of this issue).

Theoretical and experimental studies on the steady-state performance of low-speed high-torque hydrostatic drives. Part 2: Experimental investigation

2009 ◽  
Vol 223 (11) ◽  
pp. 2675-2685 ◽  
Author(s):  
S K Mandal ◽  
K Dasgupta ◽  
S Pan ◽  
A Chattopadhyay
Keyword(s):  
Steady State ◽  
Experimental Studies ◽  
Open Circuit ◽  
Control Parameters ◽  
Low Speed ◽  
Hydrostatic Transmission ◽  
Loss Coefficients ◽  
High Torque ◽  
Steady State Performance

The performance investigations of an open-circuit and a closed-circuit low-speed high-torque hydrostatic drive are presented. The modelling of both drives and determination of their loss coefficients are presented in Part 1 of this article (pg. 2663 of this issue). This study determines and analyses the overall efficiency and slip characteristics of the hydrostatic drives using the expressions describing the characteristics of their loss coefficients. The effects of critical control parameters of the pumps and the motor are investigated on the basis of their steady-state performance. This investigation is based on the performance of the hydrostatic transmission drives at different torque levels.

Theoretical and Experimental Studies of the Steady State Performance of an Orbital Rotor Low-Speed High-Torque Hydraulic Motor

1996 ◽  
Vol 210 (6) ◽  
pp. 423-429 ◽  
Author(s):  
K Dasgupta ◽  
A Mukherjee ◽  
R Maiti
Keyword(s):  
Mathematical Model ◽  
Steady State ◽  
Experimental Studies ◽  
Engineering Systems ◽  
Hydraulic Motor ◽  
Low Speed ◽  
High Torque ◽  
Complex Variation ◽  
Structured Approach ◽  
Steady State Performance

In this paper the steady state performance of epitrochoid generated orbital ‘rotary piston machine’ (ROPIMA) type ‘low-speed high-torque’ (LSHT) hydrostatic unit has been studied. The complex variation of the volume of a chamber of such a machine with shaft rotation, along with the various flow and torque losses, demand a structured approach to arrive at its mathematical model. In conventional approaches the system morphology becomes obscured as the mathematical model is approached. Bondgraph provides a structured approach to model engineering systems in a simplified manner. A reduced Bondgraph model of the LSHT Orbital motor is made where the various losses are lumped in suitable resistive elements. The variations of the loss coefficients are identified. The predicted performance of the motor has been experimentally verified.

Steady-state performance investigation of hydrostatic summation drive using bent-axis hydraulic motor

2014 ◽  
Vol 229 (17) ◽  
pp. 3234-3251 ◽  
Author(s):  
N Kumar ◽  
K Dasgupta
Keyword(s):  
Steady State ◽  
Performance Studies ◽  
State Variables ◽  
Hydraulic Motor ◽  
Displacement Pump ◽  
Torque Loss ◽  
Variable Displacement ◽  
Loss Coefficients ◽  
Overall Efficiency ◽  
Steady State Performance

This article investigates the steady-state performance of a closed-circuit hydrostatic summation drive used in heavy earth moving machine through modelling and experiment. The proposed drive basically consists of variable displacement pump and bent-axis motor. The performance studies of the drive have been made for its two different modes of operation: using single motor and two motors. Bondgraph simulation technique is used to model the drive, where various losses are lumped into suitable resistive elements. The relationships of the losses with the state variables obtained from the model are identified through experiments. The dependencies of the loss characteristics on the load torque and the pump displacement ratio are studied. The model has been verified experimentally. The performances of the hydrostatic drives are studied at different torque levels with respect to its slip, torque-loss and overall efficiency, using the expressions describing the characteristics of the loss-coefficients. The investigation also identifies the operating range of the proposed hydrostatic drives with reasonable efficiency.

scholarly journals Distribution Performance Analysis and Experimental Research on the Port Plate Pairs of Low Speed High Torque Seawater Hydraulic Motor

2019 ◽  
Vol 32 (1) ◽  
Author(s):  
Zhiqiang Wang ◽  
Shaofeng Wu ◽  
Dianrong Gao ◽  
Shuncai Wang
Keyword(s):  
Friction And Wear ◽  
Flow Distribution ◽  
Test System ◽  
Inlet Pressure ◽  
Leakage Flow ◽  
Distribution Characteristics ◽  
Hydraulic Motor ◽  
Low Speed ◽  
Rotating Speed ◽  
High Torque

AbstractThe current research of seawater hydraulic motor mainly focused on piston motor and vane motor, but seldom regarded low speed high torque seawater hydraulic motor. Low speed high torque seawater hydraulic motor as a kind of energy conversion device and actuator plays an important role in seawater hydraulic transmission system. However, the physical and chemical properties of seawater, such as low viscosity, high causticity and poor lubrication, result in numerous problems. In this paper, the flow distribution characteristics of port plate pairs for the seawater hydraulic motor are investigated, and the leakage flow and power loss models of port plate pairs are established. Numerical simulations are carried out to examine the effects of water film, inlet pressure and rotating speed on the pressure distribution and leakage flow. And the friction and wear tests of port plate pairs are also carried out. Moreover, the test system of the seawater hydraulic motor is constructed and the performance of prototype with no-load or loading is conducted. The results indicate that the clearance of port plate pairs and inlet pressure have a significant effect on distribution characteristics, but the effect of rotating speed is not very obvious. The experimental results show that the minimum error rate can be maintained within 0.3% by the proposed flow model and the counter materials of 316L against carbon-fiber-reinforced polyetheretherketone (CFRPEEK) are suitable for the port plate pairs of seawater hydraulic motor. Finally, based on the seawater hydraulic experiment platform, the volumetric efficiency of no-load and loading are obtained that the maximum can achieve 94.71% and 90.14%, respectively. This research work may improve the flow distribution performance, lubrication and the friction and wear properties, enhance energy converting efficiency of port plate pair and provide theoretical and technical support for the design of high-performance water hydraulic components.

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