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Title: AN ANALYSIS OF ENERGY AND FUNCTIONAL BEHAVIOR OF HYDROSTATIC TRANSMISSIONS
AN ANALYSIS OF ENERGY AND FUNCTIONAL BEHAVIOR OF HYDROSTATIC TRANSMISSIONS

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T. C. POPESCU;A. M. C. POPESCU;A. MARINESCU;A. I. POPESCU
10.5593/sgem2017/42/S17.006
1314-2704
978-619-7408-07-2
English
17
42
Renewable Energy Sources and Clean Technologies
Hydrostatic transmissions create compliance between rigid functional parameters of a power-machine, e.g. an electric motor, and flexible functional parameters of the work machine, e.g. a crane hoist. Hydrostatic transmissions equip fixed or mobile machinery and guidance systems for: aviation, artillery, wind turbines, hydraulic turbine blades, etc. Any hydrostatic transmission includes at least two positive displacement machines: a pump, called transmission ?primary? and a motor, called transmission ?secondary?. Hydrostatic transmissions with fixed-displacement pumps and motors are ineffectual as regards energy consumption; primary control (pump displacement control), secondary control (motor displacement control) and mixed control (pump and motor displacement control) improve energy efficiency of hydrostatic transmissions. Mixed control is the most energy-efficient; it requires finding solutions to simultaneously achieve reduction of:
- speed variation at the positive displacement motor in the secondary, depending on its load variation;
- flow discharged through the safety valve of the pump in the primary, main cause for dissipation of hydraulic energy into heat.
An experimental model of a hydrostatic transmission has been optimized as regards energy and functionality; it allowed for primary, secondary or mixed control, through the next two solutions:
- for secondary control: the solution of introducing an electronic PID (Proportional Integrative Derivative) controller in the motor speed control loop;
- for mixed control: the solution of equipping the pump with pressure regulator and introducing an electronic P (proportional) controller in the motor speed control loop.
The analysis performed used as methods mathematical modeling and numerical simulation in AMESim.
Results showed:
- for secondary control: reduction of about 50% in hydraulic motor speed variation, depending on its load variation, when using the PID controller, against using the P controller;
- for mixed control: cancellation of flow conveying through the pump safety valve, if the pump in the primary is equipped with pressure regulator, against transmission with secondary control.
There has been achieved a case of hydrostatic transmission control with energy and functional optimal behavior, based on displacement control in both positive displacement machines: it was when the pump was equipped with pressure regulator and a P type electronic controller was introduced in the positive displacement motor speed control loop.
conference
https://www.sgem.org/index.php/jresearch-article?citekey=Popescu2017174150
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17th International Multidisciplinary Scientific GeoConference SGEM 2017
17th International Multidisciplinary Scientific GeoConference SGEM 2017, 29 June - 5 July, 2017
Proceedings Paper
STEF92 Technology
International Multidisciplinary Scientific GeoConference-SGEM
Bulgarian Acad Sci; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Russian Acad Sci; Serbian Acad Sci & Arts; Slovak Acad Sci; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; World Acad Sci; European Acad Sci, Arts & Letters; Ac
41-50
29 June - 5 July, 2017
website
cdrom
3696
hydrostatic transmissions; positive displacement machines; primary; secondary or mixed control; energy efficiency.