Year 2014

• Wysokociśnieniowe uszczelnienia ruchu obrotowego wału hydraulicznych maszyn wyporowych

  Publication

  • P. Śliwiński

  - Hydraulika i Pneumatyka - Year 2014

  W artykule przedstawiono wyniki badań mające na celu wytypowanie węzła uszczelniającego wał silnika hydraulicznego zapewniającego najwyższą trwałość przy smarowaniu wodą. Parametry pracy: ciśnienie 2 MPa i minimalna prędkość poślizgu uszczelek 2 m/s. Opisano również nowatorski przyrząd, na którym przeprowadzono pomiary wszystkich parametrów węzła uszczelniającego.

Year 2015

• Multi Parameter Sliding Test Result Evaluation for The Selection of Material Pair for Wear Resistant Components of a Hydraulic motor Dedicated for Use With Environmentally Friendly Working Fluids

  Publication

  • J. Łubiński
  • P. Śliwiński

  - Solid State Phenomena - Year 2015

  In the paper the method and results are presented of the testing of tribological performance of a number of hard materials available commercially. The tests consisted in unidirectional sliding with liquid lubrication. The load and velocity regime chosen were similar to a standard four-ball lubricity test with constant velocity and load increasing over time. The regime was modified in such a way that over the initial part of the...

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• Regulator przepływu

  Publication

  • P. Śliwiński

  - Year 2015

  W artykule opisano konstrukcję i wyniki badań prototypu regulatora przepływu charakteryzującego się brakiem sprężyny. W regulatorze zawór różnicowy zastąpiono zaworem stosunku ciśnień. Charakterystyki przepływowe regulatora mają przebieg niezależny od obciążenia. Nastawa regulatora odbywa się poprzez obrót hydrostatycznie odciążonej tulei dławiącej, wewnątrz której umieszczony jest suwak główny i suwak pomocniczy zaworu stosunku...

Year 2016

• On the durability of the hydraulic satellite motor working mechanism in overload condition

  Publication

  • M. Szkodo
  • A. Stanisławska
  • P. Śliwiński

  - Advances in Materials Science - Year 2016

  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...

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• Opinia dotycząca naruszenia praw do zgłoszenia patentowego P.402847 pt.: "Ręczna wiertarka górnicza"

  Publication

  • P. Śliwiński

  - Year 2016

  Ekspertyza dotyczy naruszenia praw do zgłoszenia patentowego P.402847 pt.: "Ręczna wiertarka górnicza"

• Opinia w sprawie patentu PL 215741 pt.: „Napęd hydrauliczny” udzielonego przez Urząd Patentowy RP na rzecz firmy Spitznas Maschinenfabrik GmbH

  Publication

  • P. Śliwiński
  • A. Balawender

  - Year 2016

  Wskazano i opisano błędy merytoryczne w patencie nr 215741 oraz wskazano i opisano wspólne cechy maszyn będących przedmiotem zastrzeżeń w patentach nr 215741, 200588 i 185724

• Projektowanie zespołu kompensacji luzów osiowych w silniku satelitowym z wirującym korpusem

  Publication

  • P. Śliwiński

  - Hydraulika i Pneumatyka - Year 2016

  W artykule opisano nowatorską konstrukcję silnika satelitowego zawierającą mechanizm satelitowy o odwróconej kinematyce znamienny tym, że planeta (wirnik) oraz płyty kompensacyjne (rozrządu) są nieruchome a w ruch obrotowy wprawiana jest obwodnica. Obwodnica przekazuje napęd na korpus silnika. Zasilanie silnika odbywa się poprzez jego czop. W artykule opisano również metodykę projektowania zespołu kompensacji luzów osiowych w takim...

• Rozrząd silnika satelitowego z obracającym się korpusem

  Publication

  • P. Śliwiński

  - Napędy i Sterowanie - Year 2016

  W artykule opisano problematykę konstrukcji rozrządu w silniku z satelitowym mechanizmem roboczym, w którym obraca się obwodnica, a planeta jest nieruchoma. Wykazano, że w płytach rozrządu liczba otworów dopływu i odpływu jest równa liczbie garbów planety. Przedstawiono również dopuszczalne kształty tych otworów i ich rozmieszczenie w płycie rozrządu. Ponadto wykazano, że jest możliwe zbudowanie działającego silnika satelitowego...

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• Satelitowe maszyny wyporowe. Podstawy projektowania i analiza strat energetycznych

  Publication

  • P. Śliwiński

  - Year 2016

  Monografia poświęcona jest najnowszym konstrukcjom pomp i silników hydraulicznych satelitowych, nad którymi prace projektowe, badawcze i rozwojowe są prowadzone w laboratorium Hydrauliki i Pneumatyki Politechniki Gdańskiej od 2007 roku. W monografii wykazano, że jest możliwe zbudowanie maszyn satelitowych dla dwóch przypadków pracy satelitowego mechanizmu roboczego. Pierwszy przypadek dotyczy mechanizmu z obracającą się planetą,...

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• The basics of design and experimental tests of the commutation unit of a hydraulic satellite motor

  Publication

  • P. Śliwiński

  - Archives of Civil and Mechanical Engineering - Year 2016

  he 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...

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Year 2017

• Influence of water and mineral oil on the leaks in satellite motor commutation unit clearances

  Publication

  • P. Śliwiński

  - Polish Maritime Research - Year 2017

  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...

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• Satelitowe agregaty pompowe

  Publication

  • P. Śliwiński
  • L. Osiecki
  • P. Patrosz

  - Year 2017

  W publikacji przedstawiono konstrukcję satelitowego agregatu pompowego charakteryzującego się tym że pompa satelitowa o odwróconej kinematyce jest umieszczona wewnątrz silnika elektrycznego i zasysa ciecz poprzez otwór wydrążony osiowo w wale silnika. Zastosowana w agregacie pompa satelitowa o odwróconej kinematyce cechuje sie tym, że planeta oraz płyty kompensacyjne są nieruchome, a w ruch obrotowy wprawiana jest obwodnica. Prace...

• The influence of water and mineral oil on volumetric losses in a hydraulic motor

  Publication

  • P. Śliwiński

  - Polish Maritime Research - Year 2017

  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 comparison. The experimental tests were conducted using an innovative hydraulic satellite motor, that is dedicated to work with different liquid, including water. The sources of leaks in this motor are characterized and described also. On this...

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Year 2018

• Opracowanie opinii, zwanej dalej pracą, o zgłoszeniu patentowym nr 418605 z dnia 08.09.2016 zatytułowanym „Maszyna wyporowa obiegowo-krzywkowa zwłaszcza silnik hydrauliczny”.

  Publication

  • P. Śliwiński

  - Year 2018

  Opracowano opinię o zgłoszeniu patentowym nr P.418605 z dnia 08.09.2016r. zatytułowanym „Maszyna wyporowa obiegowo-krzywkowa, zwłaszcza silnik hydrauliczny”.

• THE INFLUENCE OF WATER AND MINERAL OIL ON MECHANICAL LOSSES IN THE DISPLACEMENT PUMP FOR OFFSHORE AND MARINE APPLICATIONS

  Publication

  • P. Śliwiński

  - Polish Maritime Research - Year 2018

  In this paper mechanical losses in a positive displacement pump 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 satellite pump. The design of the satellite pump is presented in the article. The pump features a non-circular tooth working mechanism. This pump...

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• Zagadnienia tribologiczne w hamulcu silnika hydraulicznego

  Publication

  • P. Śliwiński

  - Year 2018

  Przedmiotem badań był prototypowy hamulec cierny wielopłytkowy do silnika satelitowego SM-0,6 o teoretycznej objętości roboczej 16,7 cm3/obr. Hamulec ten zbudowany był z 27 tarcz ciernych wykonanych z materiału TOLOX oraz z pakietu sprężyn talerzowych zamontowanych w układzie X. Zablokowanie hamulca następuje w skutek siły docisku pakietu sprężyn talerzowych płytek ciernych co następuje w chwili spadku ciśnienia w komorze tłoka...

Year 2019

• The influence of water and mineral oil on volumetric losses in the displacement pump for offshore and marine applications

  Publication

  • P. Śliwiński

  - Polish Maritime Research - Year 2019

  In this paper volumetric losses in a positive displacement pump supplied with water and mineral oil are described and compared. The experimental tests were conducted using a prototype of a satellite pump (with a non-circular tooth working mechanism). In this paper the sources of volumetric losses in this pump are characterised. On this basis, a mathematical model of these losses has been presented. The results of the calculation...

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• The methodology of design of axial clearances compensation unit in hydraulic satellite displacement machine and their experimental verification

  Publication

  • P. Śliwiński

  - Archives of Civil and Mechanical Engineering - Year 2019

  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...

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Year 2020

• Determination of the theoretical and actual working volume of a hydraulic motor

  Publication

  • P. Śliwiński

  - ENERGIES - Year 2020

  A new methodology of determination of the theoretical and actual working volume of a hydraulic motor based on the characteristics of the delivered flow rate into hydraulic motor vs. the rotational speed at a constant pressure drop in the working chambers is described in this paper. A new method of describing the delivered flow rate into a motor per one shaft revolution as a nonlinear function of the pressure drop in the motor working...

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• The Influence of Water and Mineral Oil on Mechanical Losses in a Hydraulic Motor for Offshore and Marine Applications

  Publication

  • P. Śliwiński

  - Polish Maritime Research - Year 2020

  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 onducted 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...

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Year 2021

• CFD Simulations and Tests of a Prototype Flow Control Valve

  Publication

  • M. Zaleska-Patrosz
  • P. Patrosz
  • P. Śliwiński

  - Year 2021

  In this paper a prototype of a flow control valve is described and numerically simulated. The flow control valve is used in hydraulic systems to maintain constant fluid flow despite changing loads of a receiver. The standard construction of this type of valves is modified mainly by eliminating the spring. The prototype consists the hydrostatically unloaded throttle valve and pressure ratio valve substituting pressure difference...

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• Determination of the Theoretical and Actual Working Volume of a Hydraulic Motor—Part II (The Method Based on the Characteristics of Effective Absorbency of the Motor)

  Publication

  • P. Śliwiński

  - ENERGIES - Year 2021

  : In this article, the second method of determination of the theoretical and actual working volume of a hydraulic motor is described. The proposed new method is based on the characteristics of effective absorbency of the motor. The effective absorbency has been defined as the ratio of flow rate in a motor to the rotational speed of the motor’s shaft. It has been shown that the effective absorbency is a nonlinear function of the...

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• Methods of Determining Pressure Drop in Internal Channels of a Hydraulic Motor

  Publication

  • P. Śliwiński
  • P. Patrosz

  - ENERGIES - Year 2021

  In this paper, new methods for determining the pressure drop in internal channels of a hydraulic motor are proposed and described. Mathematical models of pressure losses in internal channels have also been described. Experimental tests of the satellite motor were carried out according to one of the proposed methods. The tests were carried out for two liquids, i.e., water and mineral oil. Experimental studies have shown that at...

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• Ocena stanu technicznego konstrukcji pras filtracyjnych w Grupowej Oczyszczalni Ścieków „DĘBOGÓRZE” w Gdyni

  Publication

  • W. Kiełczyński
  • M. Chodnicki
  • P. Śliwiński
  • J. Haras
  • P. Patrosz
  • A. Bieńkowski
  • M. Kiełczyński
  • M. Jóżko
  • M. Siejka

  - Year 2021

  Podstawowym celem pracy była rzeczowa ocena z punktu widzenia technicznego stanu trzech pras filtracyjnych, usytuowanych w budynku, położonym w Oczyszczalni Ścieków ‘DEBOGÓRZE w Gdyni. Zakres prac obejmował szczegółowa ocenę trzech układów w każdej prasie a mianowicie: - hydraulicznego, - sterowania i automatyki, - mechanicznego – związanego ze sprawdzeniem stanu konstrukcji nośnej i obudów.. Opis i analiza stanu poszczególnych...

• The Influence of Water and Mineral Oil on Pressure Losses in Hydraulic Motor

  Publication

  • P. Śliwiński
  • P. Patrosz

  - Year 2021

  In this paper, pressure losses in hydraulic motor supplied with water and mineral oil (two liquids that have significantly different viscosity and lubricating properties) are described and compared. The experimental tests were conducted using a hydraulic satellite motor that is dedicated to working with different liquids, including water. The methodology of measuring the pressure drop in internal channels of this motor is also...

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• Torque Transmitted by Multi-plate Wet Clutches in Relation to Number of Friction Plates and Their Dimensions

  Publication

  • M. Bąk
  • P. Patrosz
  • P. Śliwiński

  - Year 2021

  In the paper results of experimental tests on multi-plate wet clutch torque capacity for various diameters and numbers of friction plates are presented. Construction of an apparatus for laboratory tests of wet clutch engagement, drag torque and maximum torque is shown. Methodology of maximum torque capacity experiment and hydraulic circuit diagram, which supplies a motor and an actuator for the experiment are described. Analytically...

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Year 2022

• DIGITAL HYDRAULICS CIRCUIT BASED ON PWM FUNCTION FOR CONTROLLING HYDRAULIC ACTUATOR POSITION

  Publication

  • J. Zubair Ahmed
  • P. Śliwiński
  • K. Kędzia

  - Year 2022

  Hydraulic systems are used in many different industries, such as multi-source hydrostatic drive systems. In traditional hydraulic systems, a proportional servo valve is used to control the position of hydraulic actuators. The low energy efficiency and high cost of these control valves are two major problems with these systems. Digital hydraulics is one of the most unique ideas on how to solve these problems. Researchers like digital...

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• The influence of pressure drop on the working volume of a hydraulic motor

  Publication

  • P. Śliwiński

  - Eksploatacja i Niezawodność - Maintenance and Reliability - Year 2022

  Reliability and maintenance analysis of hydraulic positive machines basicly focused on the processes of their wear and failure. But in order to correctly assess the mechanical and volumetric efficiency of a hydraulic motor, both at the stage of development research or at the stage of control tests during its exploitation, the working volume of this motor must be correctly determined. Therefore this paper proposes a new method of...

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• The methodology of design of satellite working mechanism of positive displacement machine

  Publication

  • P. Śliwiński

  - Scientific Reports - Year 2022

  In this paper is described a methodology of design of satellite mechanism consisting of two noncircular gears (externally toothed rotor and internally toothed curvature) and circular gears (satellites). In the presented methodology is assumed that the rotor pitch line is known, and the curvature pitch line is necessary to designate. The presented methodology applies to mechanisms for which the number of the curvature humps is at...

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Year 2023

• Comparison of Mathematical Models of Torque Transmitted by Multi-disc Wet Clutch with Experimental Results

  Publication

  • M. Bąk
  • P. Patrosz
  • P. Śliwiński
  • P. Załuski
  • M. Karpenko

  - Year 2023

  In this article was described the methodology for the experimental study of flows in the prototype of a satellite hydraulic motor with a rotating body. The experimental tests of the motor were carried out at a low constant rotational speed in a wide range of pressure drop in this motor. The constant rotational speed of the motor was kept by a worm gear. Based on the test results, the leakage characteristics in the flat gaps of...

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• Effect of Simultaneous Valve Closures in Hydraulic Piping Systems

  Publication

  • K. Urbanowicz
  • I. Haluch
  • A. Bergant
  • A. Deptuła
  • P. Śliwiński

  - Year 2023

  The paper investigates wave interference (between pressure waves) occurring in simple hydraulic systems. Water hammer was induced by simultaneous closure of three valves located at the reservoirs of a “Y” type hydraulic system. Numerical simulations were carried out with the help of the freeware computer package Allievi enabling the reader to replicate results in a direct manner. The influence of the following quantities has been...

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• Experimental Study of Flow Rate in Hydraulic Satellite Motor with the Rotating Case at a Low Constant Rotational Speed

  Publication

  • P. Śliwiński
  • P. Patrosz
  • M. Bąk
  • M. Stosiak
  • K. Urbanowicz
  • Š. Šukevičius

  - Year 2023

  In this article was described the methodology for the experimental study of flows in the prototype of a satellite hydraulic motor with a rotating body. The experimental tests of the motor were carried out at a low constant rotational speed in a wide range of pressure drop in this motor. The constant rotational speed of the motor was kept by a worm gear. Based on the test results, the leakage characteristics in the flat gaps of...

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• Influence of geometrical and operational parameters on tooth wear in the working mechanism of a satellite motor

  Publication

  • P. Śliwiński

  - Scientific Reports - Year 2023

  This article describes the phenomena affecting the wear of the rotor of the working mechanism in a hydraulic satellite motor. The basic geometrical relationships that allow the calculation of the coordinates of the points of contact between the satellite and the rotor and the curvature are presented. A method for calculating the number of contacts of the satellite teeth with the rotor teeth and of the satellite teeth with the curvature...

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• Initial Investigation of Wave Interactions During Simultaneous Valve Closures in Hydraulic Piping Systems

  Publication

  • K. Urbanowicz
  • I. Haluch
  • A. Bergant
  • A. Deptuła
  • P. Śliwiński

  - WATER RESOURCES MANAGEMENT - Year 2023

  The effects of interference of pressure waves in simple piping systems were studied. A freeware computer code Allievi developed at the University of Valencia was used to simulate dynamic waveforms in simple and complex networks. The tests were carried out according to three scenarios. No pressure increases significantly exceeding the Joukowsky pressure in simple cases were noticed. When the effects of the simultaneous closing of...

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• Methodology of experimental research on efficiency of hydro-mechanical automatic gearbox

  Publication

  • P. Patrosz
  • P. Załuski
  • M. Bąk
  • P. Śliwiński
  • M. Karpenko

  - Year 2023

  The article shortly describes the design and principle of operation of the hydromechanical gearbox and presents the methodology and design of test stands used for testing hydromechanical proto-type gearbox developed at Technical University of Gdansk. The article presents an approach according to which, in order to obtain reliable measurement data, it is necessary to separate the tests of the hydraulic and mechanical parts of the...

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• The Methodology for Determining the Theoretical Based on the Characteristics of Effective Absorbency Versus Pressure Drop in the Motor

  Publication

  • P. Śliwiński

  - Year 2023

  This article describes a method for determining the theoretical and actual working volume of a hydraulic motor. It has been shown that the actual working volume of the motor is the sum of the theoretical working volume and the additional volume that depends on the pressure drop in the working chambers of the motor. It was also shown that the volumetric losses in the hydraulic motor are not only a function of the pressure drop in...

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Year 2024

• Experimental study of the multi-disc negative brake for a hydraulic motor

  Publication

  • P. Śliwiński
  • R. Jasiński

  - Year 2024

  This paper describes the methodology for experimental testing of a multi-disc brake. The construction of this brake was also present. The brake is dedicated to hydraulic motors with a small working volume. Experimental tests were carried out on a brake with plates immersed in oil and, for comparison, tests were carried out on a dry brake. As a result of the tests, the permissible torque (load) that is able to transfer the brake...

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• Influence of operating pressure on the durability of a satellite hydraulic motor supplied by rapeseed oil

  Publication

  • P. Śliwiński

  - Scientific Reports - Year 2024

  This article describes the results of a durability test of a hydraulic satellite motor supplied by rapeseed oil. The tests were carried out on a test stand in a power recuperation system. The tests of the motor were carried out at a constant shaft speed for three fixed pressure drops in the motor. This made it possible to demonstrate the influence of the motor operating pressure on the durability of the satellite mechanism. The...

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