Study of losses and energy efficiency of hydrostatic drives with hydraulic cylinder

• Autorzy: Skorek G.

Identyfikatory

DOI

10.2478/pomr-2018-0138

• Języki publikacji: EN

Abstrakty

EN

Energy efficiency of hydrostatic transmissions, and especially efficiencies of drives with motor speed controlled by throttle, as well as efficiency of hydraulic servomechanisms can in fact be higher than the efficiency values most frequently given by the respective literature in this field. With the progress achieved in recent years in the development of hydraulic systems it is becoming necessary to develop methods for precise energy efficiency calculation of such systems. It is difficult to imagine that more and more, better and better machines and control elements could be used without the possibility of a mathematical tool at our disposal to enable an accurate analysis and assessment of behavior of the system in which such machines and control elements have been applied. The paper discusses energy savings using mathematical model of losses in elements, the energy efficiency of the system. There are possibilities to reduce energy losses in proportional control systems (in the pump, in the throttle control unit, especially in the cylinder), and thus to improve the energy efficiency of the throttling manifold. The considerations allow for comparison of the loss power resulting from the applied hydraulic control structure of the hydraulic cylinder and the power consumed by the pump from the electric motor that drives it, the power necessary to provide pump-driven hydraulic cylinder. The article shows the impact on the output (useful) power consumed in the considered systems, and the impact on the power consumed of the loss power in the individual elements. The paper presents also formulas of loss power, formulas of energy efficiency connected with investigated hydrostatic drives, two schematic diagrams of hydraulic systems, their principle of operation and problems of studying losses in elements and energy efficiency characteristics of systems consisting of a feed assembly, control set and cylinder. It also includes a subject matter connected with an energy loss power of hydrostatic systems with hydraulic cylinder controlled by proportional directional control valve. Diagrams of loss power of two hydraulic systems worked at the same parameters of speed and load of a cylinder, which were different due to structure and ability of energy saving, were presented and compared.

Słowa kluczowe

EN

energy losses; energy efficiency; hydrostatic system; control structures; proportional directional control valve; cylinder

• Wydawca: Gdańsk University of Technology, Faculty of Ocean Engineering & Ship Technology
• Czasopismo: Polish Maritime Research
• Rocznik: 2018
• Tom: nr 4
• Strony: 114--129
• Opis fizyczny: Bibliogr. 16 poz., rys., tab.

Twórcy

autor

Skorek G.

• Department of Engineering Sciences Faculty of Marine Engineering Gdynia Maritime University Morska 81–87, 81-225 Gdynia

Bibliografia

• 1. Paszota Z.: Energy-saving structures of hydrostatic drives for ship deck machines. Polish Maritime Research, Vol. 7, No 1, 2000, pp. 3–9.
• 2. Paszota Z.: Energy efficiency of hydraulic cylinders in servo-mechanism. Conference proceedings. International XIX Scientific Conference of Naval Architects and Marine Engineers “Marine Technology on the Theshold of XXI Century – Marine Technology 2000”. May 4–6, 2000, Szczecin-Dziwnowek, Poland. Szczecin Technical University, Pol. Acad. Sci., Soc. Pol Naval Arch. Marine Eng. KORAB. 2000, pp. 139–147.
• 3. Paszota Z.: Hydraulic proportional control of the cylinder with a variable pressure overflow valve – a model of the energy efficiency of the system. Chapter in the monograph: “Research, design, manufacturing and operation of hydraulic systems”, Edward Palczak editor, “Cylinder” Library (in Polish), Centrum Mechanizacji Gornictwa „Komag”, Gliwice 2001, pp. 55–67.
• 4. Paszota Z.: Energy – Saving Supply Structures of the Throttling Directional Control Valve in the System of Proportional Control of the Linear Hydraulic Motor.[Proceedings] Viertes Deutch – Polnisches Seminar “Innovation und Fortschritt in der Fluidtechnik”, Sopot, 20–21 September 2001, Technische Universitat Warszawa, Fakultat fur Mechatronik, Institut fur Automatik und Robotik, pp. 90–100.
• 5. Paszota Z.: Energy aspects of hydrostatic drives. Polish Maritime Research, Vol. 10, No 2 2003, pp. 18–20.
• 6. Paszota Z.: An Energy Behaviour Comparison of two Kinds of Hydrostatic Drive of Ship Deck Machines. Brodogradnja – Journal of Naval Architecture and Shipbuilding Industry, Brodarski Institut Zagreb, Vol. 52, No 3, 2004, pp. 213–222.
• 7. Paszota Z.: Model of losses and energy efficiency of a hydraulic system with proportional control of the cylinder fed by a constant capacity pump in a variable pressure system. Chapter in the monograph: ”Research, design, manufacturing and operation of hydraulic systems”, Edward Palczak editor, “Cylinder” Library (in Polish), Centrum Mechanizacji Gornictwa „Komag”, Gliwice, 2005, pp. 145–162.
• 8. Paszota Z.: Energy Saving in a Hydraulic Servomechanism System – Theory and Examples of Laboratory Verification. Brodogradnja, Journal of Naval Architecture and Shipbuilding Industry, Zagreb, Vol. 58, No 2, 2007, pp. 146–157.
• 9. Paszota Z.: Power of energy losses in the hydrostatic drive system elements – definitions, relations, change ranges, energy efficiencies. Part II – Conduits, throttling control assembly, pump, Chapter in the monograph: “Research, design, manufacturing and operation of hydraulic systems”, Andrzej Meder and Adam Klich editors, “Cylinder” Library (in Polish), Centrum Mechanizacji Gornictwa „Komag”, Gliwice, 2007, pp. 121–139.
• 10. Paszota Z.: Graphical presentation of the power of Energy losses and power developed in the hydrostatic drive and control system elements. Part I – Systems with the series throttling control of the hydraulic rotational motor speed, Chapter in the monograph: “Research, design, manufacturing and operation of hydraulic systems”, Adam Klich, Edward Palczak and Andrzej Meder editors, “Cylinder” Library (in Polish), Centrum Mechanizacji Gornictwa „Komag”, Gliwice, 2008, pp. 121–139.
• 11. Paszota Z.: Losses and energy efficiency of hydraulic motors and drive systems (in Polish). Drive and Control, No. 5, 2013, pp. 82–90.
• 12. Paszota Z.: Losses and energy efficiency of drive motors and systems. Replacement of the Sankey diagram of power decrease in the direction of power flow by a diagram of power increase opposite to the direction of power flow opens a new perspective of research of drive motors and systems. Polish Maritime Research, Vol.20, No 1 (77), 2013, pp. 3–10.
• 13. Paszota Z.: Energy losses in hydrostatic drive. Monography, LAP Lambert, Acadamic Publishing, 2016.
• 14. Skorek G.: Energy characteristics of the hydraulic system with proportional control of cylinder, fed by a constant capacity pump in a constant pressure and variable pressure system (in Polish). Doctor dissertation. Gdansk University of Technology, Faculty of Ocean Engineering and Ship Technology, 2010.
• 15. Skorek G.: Energy efficiency of a hydrostatic drive with proportional control compared with volumetric control. Polish Maritime Research, Vol. 20, No 3 (79), 2013, pp. 14–19.
• 16. Quan Z., Quan L., Zhang J.: Review of energy efficient direct pump controlled cylinder electro-hydraulic technology. Renewable and Sustainable Energy Reviews, Elsevier, Vol. 35, 2014, pp. 336–346.

Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).