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1
Content available Method of sum of power losses as a way for determining the ki coefficients of energy losses in hydraulic motor
Maczyszyn A.
Polish Maritime Research
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2016
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nr 2
57--67
EN
This paper shows application of the method of sum of power losses to determining energy losses which occur in hydraulic rotary motor in situation when not all laboratory data are at one’s disposal or when no use is made of data contained in catalogue charts. The method makes it possible to determine the coefficients, ki, of energy losses occurring in the motor. The method of sum of power losses is based on the approach proposed by Z. Paszota, in the papers [3 ÷ 9]. It consists in adding power flow of energy losses occurring in the motor to power flow output and comparing the sum to the power flow input. Application of the method is exemplified by using a A6VM hydraulic motor.
2
Content available remote Metoda sumy mocy strat jako sposób określania współczynników ki strat energetycznych występujących w silniku hydraulicznym
Maczyszyn A.
Napędy i Sterowanie
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2015
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R. 17, nr 9
148--155
PL
W artykule pokazano zastosowanie metody sumy mocy strat w ocenie strat energetycznych występujących w silniku hydraulicznym obrotowym w sytuacji, gdy nie dysponujemy wszystkimi danymi laboratoryjnymi lub gdy korzystamy z danych zawartych w kartach katalogowych. Metoda ta pozwala na określenie współczynników ki strat energetycznych występujących w silniku. Metoda sumy mocy jest oparta na spojrzeniu proponowanym przez Z. Paszotę w pracach [3–9]. Metoda polega na dodawaniu strumienia mocy strat energetycznych występujących w silniku do strumienia mocy wyjściowej i porównaniu tej sumy z mocą wejściową. Zastosowanie metody sumy mocy strat przedstawiono na przykładzie silnika hydraulicznego A6VM.
EN
The article shows how to use the method sum of power loss. This method allows to determine the coefficients ki energy losses in the hydraulic motor in a situation where we do not have all the laboratory data, or when we use the data contained in the data sheets. The method sum of power loss is a method based on the look proposed by Z. Paszotę in [3–9]. The method consists in adding power flow of energy losses in the machine to power flow output, as shown in Figure 1. The method sum of power loss is shown on the example of the hydraulic rotational motor A6VM.
3
Content available Evaluation of losses in a hydraulic motor based on the SWSB - 63 motor tests
Maczyszyn A.
Polish Maritime Research
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2010
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nr 4
46-53
EN
In this paper are compared two models of energy losses: that suggested by Prof. Paszota, Z. in monograph “Energy losses in the hydraulic displacement motors – definitions and relations serving the evaluation of the efficiency of hydrostatic drive” [18] and that of Prof. Balawender, A. in “Energy analysis and methodology of testing of low-speed hydraulic motors” [1]. By using the data obtained from the tests of SWSB-63 hydraulic motors [2] the graphs which illustrate mechanical, volumetric and pressure losses in function of the parameters on which the losses directly depend [18 ], have been elaborated and showed in comparison with the description of such losses in function of the parameters assumed in [1]. The below presented text has been complemented in relation to that published in the monograph [4] and read during the scientific technical conference „Cylinder 2010” organized by the Mining Engineering Centre „Komag”, Gliwice, and held on 20÷22 September 2010 in Rytro, Poland.
4
Content available Graphical presentation of the power of energy losses and power developed in the elements of hydrostatic drive and control system. Part II. Rotational hydraulic motor speed parallel throttling control and volumetric control systems
Paszota Z.
Polish Maritime Research
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2008
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nr 4
21-29
EN
Paper presents graphical interpretation of the power of energy losses in the hydrostatic drive and control system elements and also of the power developed by those elements. An individual system fed by a constant capacity pump, where rotational hydraulic motor speed control is effected by a parallel throttling control system, is analyzed and also a system with the rotational hydraulic motor speed volumetric control by a variable capacity pump, an individual system with a rotational hydraulic motor volumetric speed control by means of a simultaneous change of the pump capacity per one revolution and change of the motor capacity per one revolution, the system operating at the constant pressure in the pump discharge conduit equal to the nominal pressure of the system: pP2 = pn and central system (with situated in parallel and simultaneously operating motors) with volumetric speed control of each rotational hydraulic motor by a motor secondary circuit assembly, the system fed by a pump with variable capacity per one shaft revolution fitted with pressure regulator pP2 = pn.
5
Content available Graphical presentation of the power of energy losses and power developed in the elements of hydrostatic drive and control system. Part I. Rotational hydraulic motor speed series throttling control systems
Paszota Z.
Polish Maritime Research
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2008
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nr 3
28-37
EN
Paper proposes and justifies a diagram of the direction of increase of power stream from the shaft or piston rod of a hydraulic motor to the pump shaft, power increasing as an effect of the imposed power of energy losses in the hydrostatic drive and control system elements. Graphical interpretation of the power of energy losses in the hydrostatic drive and control system elements and also of the power developed by those elements is presented. An individual system with the rotational hydraulic motor speed series throttling control fed by a constant capacity pump cooperating with an overflow valve in a constant pressure system p = cte . pn is analyzed and also an individual system with the rotational hydraulic motor speed series throttling control fed by a constant capacity pump cooperating with an overflow valve controlled in a variable pressure system: p = var, an individual system with the rotational hydraulic motor speed series throttling control fed by a variable capacity pump cooperating with a pressure regulator in a constant pressure system p = cte . pn and an individual system with the rotational hydraulic motor speed series throttling control fed by a variable capacity pump cooperating with the Load Sensing regulator in a variable pressure p = var system.
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