Modeling of Digital-Displacement Pump-Motors and Their Application as Hydraulic Drives for Nonuniform Loads

[+] Author and Article Information
Md. Ehsan

Department of Mechanical Engineering, Bangladesh University of Engineering & Technology (BUET), Dhaka, Bangladesh

W. H. S. Rampen

Artemis Intelligent Power Ltd., Edinburgh, Scotland

S. H. Salter

Department of Mechanical Engineering, University of Edinburgh, Edinburgh, Scotland

J. Dyn. Sys., Meas., Control 122(1), 210-215 (Jun 26, 1997) (6 pages) doi:10.1115/1.482444 History: Received June 26, 1997
Copyright © 2000 by ASME
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Ehsan,  Md., Rampen,  W. H. S, and Salter,  S. H, 1996, “Computer Simulation of the Performance of Digital-Displacement Pump-Motors” ASME International Mechanical Engineering Congress and Exposition, FPST 3, pp. 19–24, Atlanta, Nov. 1996.
Rampen, W. H. S., Salter, S. H., and Fussey, A., “Constant Pressure Control of the Digital Displacement Pump,” 4th Bath Intn’l Fluid Power Workshop, Fluid Power Systems and Modelling, Bath, Sept. 1991, RSP, pp. 45–62.
Rampen,  W. H. S., and Salter,  S. H., “The Digital Displacement Hydraulic Piston Pump,” Proc. 9th International Symposium on Fluid Power, BHR Group, Cambridge, April 1990, STI, pp. 33–46.
Rampen, W. H. S, Almond, J. P., and Salter, S. H, “The Digital Displacement Pump/Motor Operating Cycle: Experimental Results Demonstrating the Fundamental Characteristics,” 7th International Fluid Power Workshop, Bath, 1994, pp. 321–331.
Salter,  S. H., and Rampen,  W. H. S., “The Wedding Cake Multi-Eccentric Radial Piston Hydraulic Machine with Direct Computer Control of Displacement,” Proc. 10th International Conference on Fluid Power, BHR Group, Brugge, April 1993, MEP, pp. 47–64.
Post W. J. A. M., and Burgt, J. A. H. V, “Energy saving and system optimization in cyclic loaded hydraulic power transmissions,” 7th International Fluid Power Workshop, Bath, 1994.
Ehsan, Md., Rampen, W. H. S., and Taylor, J. R. M, 1995, “Simulation and Dynamic Response of Computer Controlled Digital Hydraulic Pump/Motor System Used in Wave Energy Power Conversion,” 2nd European Wave Power Conference, pp. 305–311, Lisbon, 8–10 Nov. 1995.
Akers,  A., and Lin,  S. J., 1987, “Dynamic Analysis of an Axial Piston Pump with a Two-Stage Controller and Swash-Plate Position Feedback,” Proceedings of the 8th International Symposium of Fluid Power, BHRA, Birmingham, 1987, pp. 547–564.
System Build (MatrixX), Simulation Package, Integrated Systems, Inc., Santa Clara, CA.


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Cylinder head arrangement of a digital-displacement pump-motor
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Change of the enabling sequences of a 10 cylinder pump and its effect on flow as the demand drops to 3/4th of the capacity
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Valve actuation sequence of motoring cycle
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Pump response at 10 percent to 90 percent step rise of flow demand at a constant speed (pressure-control mode)
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Pump response to 17 percent speed change, while the flow demand remains constant (pressure-control mode)
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Pump-motor following a variable demand curve at 1800 rpm (flow-control)
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Flow chart of simulation process
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Schematic drawing of the system
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Power requirement of the pump-motor bank
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Flow demand in first bank and pressure variation in the accumulator
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Demand and flow from second bank (pump)
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Power in and out of the system
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Components of a 6-cylinder pump-motor
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Experimental results in pressure-control mode



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