Determination of coefficients of energy losses occurring in a constant capacity pump working in a typical hydrostatic drive

• Autorzy: Skorek Grzegorz

Identyfikatory

DOI

10.2478/kones-2019-0019

• Języki publikacji: EN

Abstrakty

EN

In order to assess possibilities of energy saving during hydrostatic drive system operation, should be learned, and described losses occurring in system. Awareness of proportion of energy, volume, pressure, and mechanical losses in elements is essential for improving functionality and quality of hydrostatic drive systems characterized by unquestionable advantages. In systems with too low efficiency there is increase of load, mainly in case of pump load, which can lead to higher risk of failure, necessity of repair or replacement, as well as to shorten service life of system. Coefficients ki, given in subject literature by Paszota, describe relative value of individual losses in element. They make it possible to assess proportions of losses and assess value of energy efficiency (volumetric, pressure, mechanical) resulting from losses occurring at nominal pressure pn of system in which element is used. As a result, thanks to knowledge of coefficients ki of individual losses, it is possible to determine losses and energy efficiency of components operating in hydraulic system as well as efficiency of system with defined structure of motor speed control as function of speed and load coefficient of motor. Knowledge of coefficients of energy losses occurring in system elements (pump, hydraulic motor, conduits, and motor) allows building models of losses and energy efficiency of element working in system and energy efficiency of system as whole composed of elements. Mathematical models of losses and energy efficiency in system must take into account conditions resulting from applied structure of system, from level of nominal pressure, from rotational speed of motor driving pump shaft, from viscosity change of applied hydraulic oil. Article presents method of determining coefficients of axial piston pump used in typical hydrostatic drive system with proportional control. Values that can be assumed for these loss coefficients for other hydraulic pumps are also given.

Słowa kluczowe

EN

coefficients of losses; energy losses; hydrostatic system; axial piston pump

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2019
• Tom: Vol. 26, No. 1
• Strony: 159--166
• Opis fizyczny: Bibliogr. 4 poz., rys.

Twórcy

autor

Skorek Grzegorz

• Gdynia Maritime University, Department of Engineering Sciences Morska Street 81-87, 81-225 Gdynia, Poland tel.: [phone]

Bibliografia

• [1] Paszota, Z., Model of losses and energy efficiency of the hydraulic system with proportional control of the hydraulic cylinder supplied with a constant capacity pump in a variable pressure system, Chapter in monograph: Research, construction, manufacture and operation of hydraulic systems, Komag, pp. 145-162, Gliwice 2005.
• [2] Paszota, Z., Energy losses in hydrostatic drive. Drive investigation method compatible with diagram of power increase opposite to the direction of power flow, LAP Lambert Academic Publishing, Saarbrucken 2016.
• [3] 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, Gdansk 2010.
• [4] Skorek, G., Energy efficiency of a hydrostatic drive with proportional control compared with volumetric control, Polish Maritime Research, Vol. 03, pp. 14-19 Gdansk 2013.

Uwagi

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