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1
Content available The influence of water and mineral oil on mechanical losses in a hydraulic motor for offshore and marine applications
Śliwiński Paweł
Polish Maritime Research
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2020
|
nr 2
125--135
EN
In this paper, mechanical losses in a hydraulic motor supplied with water and mineral oil (two liquids having significantly different viscosity and lubricating properties) are described and compared. The experimental tests were conducted using a special design (prototype) of a hydraulic satellite motor. The design of the satellite motor is presented. This motor was developed to supply both with water and mineral oil and features a non-circular tooth working mechanism. The paper also characterizes sources of mechanical losses in this motor. On this basis, a mathematical model of these losses has been developed and presented. The results of calculation of mechanical losses according to the model are compared with the experimental results. Experimental studies have shown that the mechanical losses in the motor supplied with water are 2.8 times greater than those in the motor supplied with oil. The work demonstrates that the mechanical losses in both the motor supplied with water and the one supplied with oil are described well by the mathematical model. It has been found that for the loaded motor working at high speed, the simulation results differ from experimental ones by no more than 3% for oil and 4% for water.
2
Content available remote The methodology of design of axial clearances compensation unit in hydraulic satellite displacement machine and their experimental verification
Sliwinski Pawel
Archives of Civil and Mechanical Engineering
|
2019
|
Vol. 19, no. 4
1163--1182
EN
A new methodology of calculating the dimensions of the axial clearance compensation unit in the hydraulic satellite displacement machine is described in this paper. The methods of shaping the compensation unit were also proposed and described. These methods were used to calculate the geometrical dimensions of the compensation field in an innovative prototype of a satellite hydraulic motor. This motor is characterized by the fact that the body rotates. In other words, the planet (an inner element of the working mechanism) is stationary and the curvature (an external element of the working mechanism) is rotating. The inflow and outflow ports are located in the motor pin which replaces its shaft. The results of the analytical calculation of the compensation field geometrical dimensions were used in FEM calculations of the compensation plate deformation. The correctness of the design of axial clearance compensation unit has been verified experimentally. The experimental method consists in measuring leaks in the gaps of the working mechanism and measuring the torque at low constant speed of the motor case. The results of experimental test are also described in this paper. This way, it has been proven that the proposed new analytical methodology for the design of the axial clearance compensation unit in the hydraulic satellite displacement machine is correct.
3
Content available The influence of water and mineral oil on volumetric losses in a hydraulic motor
Śliwiński P.
Polish Maritime Research
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2017
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S 1
213--223
EN
In this paper volumetric losses in hydraulic motor supplied with water and mineral oil (two liquids having significantly different viscosity and lubricating properties) are described and compared. The experimental tests were conducted using an innovative hydraulic satellite motor, that is dedicated to work with different liquids, including water. The sources of leaks in this motor are also characterized and described. On this basis, a mathematical model of volumetric losses and model of effective rotational speed have been developed and presented. The results of calculation of volumetric losses according to the model are compared with the results of experiment. It was found that the difference is not more than 20%. Furthermore, it has been demonstrated that this model well describes in both the volumetric losses in the motor supplied with water and oil. Experimental studies have shown that the volumetric losses in the motor supplied with water are even three times greater than the volumetric losses in the motor supplied with oil. It has been shown, that in a small constant stream of water the speed of the motor is reduced even by half in comparison of speed of motor supplied with the same stream of oil.
4
Content available Influence of water and mineral oil on the leaks in satellite motor commutation unit clearances
Śliwiński P.
Polish Maritime Research
|
2017
|
nr 3
58--67
EN
The article describes the flow rates of mineral oil and water flowing, as working media, through the commutation unit of a hydraulic satellite motor. It is demonstrated that geometrical dimensions of commutation unit clearances change as a function of the machine shaft rotation angle. Methods for measuring the rate of this flow and the pressure in the working chamber are presented. The results of pressure measurements in the working chamber during the transition from the filling cycle to the emptying cycle are included. The pressure in the motor’s working chamber changes linearly as a function of the shaft rotation angle, which has a significant effect on the leakage in the commutation unit clearances. The paper presents new mathematical formulas in the form: Q=f(Δpγ) to calculate the flow rate of water and mineral oil in the commutation unit clearances. The γ factor is described as a function of fluid viscosity and clearance length (the motor shaft rotation angle). The coefficients used in these formulas were determined based on the results of laboratory tests of a motor supplied with water and mineral oil.
5
Content available remote The basics of design and experimental tests of the commutation unit of a hydraulic satellite motor
Sliwinski P.
Archives of Civil and Mechanical Engineering
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2016
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Vol. 16, no. 4
634--644
EN
The article presents an analytical method to design the commutation unit in a hydraulic satellite motor. It is shown that the size of the holes feeding the working chambers and their location on the plates closing those chambers depends on the geometrical dimensions of the working mechanism. The overlap in the commutation unit depends on the rotational speed range. It is demonstrated that the geometrical dimensions of the commutation unit clearances change as a function of the angle of machine shaft rotation. The flow in these clearances is described as Q = f(Δpγ). It has been observed that during the transition from the cycle of filling to the cycle of emptying the working chamber, the pressure in the motor's working chamber changes linearly as a function of the shaft rotation angle which has a significant effect on leakage in the commutation unit clearances. The methodology of investigating the commutation unit in a satellite motor and the mathematical model of leakage in the commutation unit clearance described in the article may be successfully adopted to research the commutation unit in positive displacement machines of another type.
6
Content available remote On the durability of the hydraulic satellite motor working mechanism in overload condition
Szkodo M., Stanisławska A., Śliwiński P.
Advances in Materials Science
|
2016
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Vol. 16, nr 1(47)
35--46
EN
The paper presents the newest construction of the hydraulic satellite pump/motor. In this study, the fracture of the hydraulic satellite motor working mechanism is investigated. Factors influencing the durability of satellite working mechanism have been described. The durability of the hydraulic satellite motor working mechanism at a load, corresponding to a pressure of 15 MPa supplied with refined rapeseed oil is very low. Analyses of construction and laboratory tests showed that the satellites teeth wear out the fastest. Results showed that bending fatigue and surface contact fatigue of the satellites are the main cause of the hydraulic satellite motor working mechanism failures.
7
Content available Flow of liquid in flat gaps of the satellite motor working mechanism
Sliwiński P.
Polish Maritime Research
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2014
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nr 2
50--57
EN
The article describes the methodology and results of investigations of the flow of oil and HFA-E emulsion in flat gaps of the working mechanism of a satellite motor. The flow of liquid in those gaps is turbulent and not fully developed. The article presents two methods of modelling this flow. Method I makes use of the Darcy-Weisbach formula, while Method II bases on the assumption that in the variable-length gaps the flow is turbulent in the area where the length is the smallest and laminar where the length is the largest. Consequently, the flow in such gaps can be modelled as the sum of laminar and turbulent flows. The results obtained in the experiment have made the basis for calculating relevant coefficients and assessing the proportion of turbulence in the flow modelled using both methods.
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