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1

New generation of the satellite hydraulic pumps

Osiecki Leszek

Journal of Mechanical and Energy Engineering

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2019

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Vol. 3, No 4

309--314

EN

Hydraulic satellite machines are known and produced in many versions, recognizable by the number of humps on their inner rotor and external gear, and therefore by the number of cooperating gears (satellites). All known shapes were however designed on the base of preliminary assumption that rotor’s and external gear’s pitch lines are formed by merging arcs, tangent to each other in the. This assumption makes calculations easier, but the curvature radius of the pitch lines changes instantly in their merging points. Tests made in the Department of Hydraulics and Pneumatics of the Gdańsk University of Technology proved that satellite motors may work also as a pump. All known shapes were however designed for motor work - mainly for low-speed, high-torque motors. Sudden changes of the pitch line’s curvature strongly affect velocity and acceleration of pump’s moving parts and forces between them. Because of that, in the pump mode fast wear of teeth in the points of small curvature radius is visible. The obvious effect is reduced durability and high noise emission. To eliminate all those problems the new mechanism, designed for the pump is necessary. The author worked out the new method of calculating satellite mechanism’s shape. Instead of merged arcs this method allows to form pitch line as a smooth shape with constantly variable curvature (no rapid changes in any point). Such a mechanism with two-humped rotor, four-humped external gear and six satellites was designed with the use of the new method. Curvature radii of all cooperating elements are relatively high. The proposed shape reduces rapid changes of velocity and forces between pump’s elements. It should result in more durable hydraulic satellite pump.

2

Rozwój konstrukcji pomp satelitowych

Osiecki L.

Napędy i Sterowanie

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2018

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R. 20, nr 12

84--88

PL

Artykuł prezentuje budowę i działanie hydraulicznej pompy satelitowej. Zbudowane i przebadane prototypy nowej pompy wykazały się wysokimi parametrami pracy i zdolnością tłoczenia różnych cieczy: oleju, wody i emulsji HFAE. Mechanizm pompy tworzą dwie nieokrągłe uzębione bieżnie: zewnętrzna obwodnica i wewnętrzna planeta oraz umieszczone pomiędzy nimi koła zębate (satelity). Obecny kształt planety i obwodnicy powoduje szybkie zużycie zębów, obniżając trwałość pompy. Aby uzyskać w pełni funkcjonalny produkt, konieczne są zmiany kształtu mechanizmu pompy. Artykuł prezentuje metodę wyznaczania nowego kształtu i wyniki wstępnej analizy.

EN

The article describes the design and operation of the satellite hydraulic pump. Two versions of the new pump were built and tested, showing good performance and ability to work with different fluids: oil, water and HFAE emulsion. The pump’s mechanism consists of a non-circular gear with external teeth (planete), non-circular gear with internal teeth (curvature), and circular gears (satellites) between them. Present shape of the planete and curvature causes fast wear of teeth and reduces pump’s durability. To make the pump fully operational changes of the mechanism shape are necessary. Methods of determination of the corrected shape and preliminary results of the analysis are shown.

3

Proposals for increase the tensile characteristic of the vehicle Aligator 4x4

Kunáš Š., Droppa P.

Zeszyty Naukowe Instytutu Pojazdów / Politechnika Warszawska

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2016

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z. 3/107

27--32

EN

The objective of this work is through the various proposals to point to an increase in the tensile characteristics of the vehicle Aligator 4x4. The work is divided into two parts. The first section describes the technical data of vehicle Aligator 4x4 and the calculation procedure tensile characteristics. The second part focuses on the evaluation of the calculation of four proposals to increase the tensile characteristics of the vehicle Aligator 4x4. The proposals are based on the exchange of original gear groups such as the engine and transmission for more modern and more powerful units. One proposal is based on retaining the original motor-gear system, complemented by a parallel connected electric drive. Images of mechanisms and graphs of calculations are referred in work. The calculated values are placed in tables in the Attachment of this work. In conclusion there is a summary of the results, which were obtained by comparing the tensile characteristics of the original vehicle with each proposal.

PL

Celem tego opracowania jest, poprzez pokazanie różnych propozycji, wzrostu elastyczności podczas przyspieszania pojazdu 4x4 Aligator. Praca jest podzielona na dwie części. Pierwsza sekcja opisuje dane techniczne pojazdu Aligator 4x4 oraz obliczenia elastyczności. Druga część skupia się na ocenie obliczonych wcześniej czterech propozycji zmian w napędzie pojazdu, w celu zwiększenia elastyczności pojazdu 4x4 Aligator. Propozycje skupiają sie na wymianie elementów oryginalnego układu napędowego, takich jak silnik i skrzynia biegów na bardziej nowoczesne i bardziej wydajnych jednostki. Jedną z propozycji jest zachowanie oryginalnego układu silnik-skrzynia biegów i uzupełnianie go o równolegle podłączony napęd elektryczny. Rysunki mechanizmów i wykresów z obliczeń, zostały pokazane w pracy. Obliczone wartości są umieszczone w tabelach w Załączniku do niniejszej pracy. Na zakończenie jest podsumowanie wyników, które zostały uzyskane przez porównanie elastyczności pojazdu dla każdej propozycji.

4

Inverse method for a one-stage spur gear diagnosis

Akrout A., Tounsi D., Taktak M., Abbes M. S., Haddar M.

Journal of Theoretical and Applied Mechanics

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2015

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Vol. 53 nr 3

617--628

EN

In this paper, a source separation approach based on the Blind Source Separation (BSS) is presented. In fact, the Independent Component Analysis (ICA), which is the main technique of BSS, consists in extracting different source signals from several observed mixtures. This inverse method is very useful in many fields such as telecommunication, signal processing and biomedicine. It is also very attractive for diagnosis of mechanical systems such as rotating machines. Generally, dynamic responses of a given mechanical system (displacements, accelerations and speeds) measured through sensors are used as inputs for the identification of internal defaults. In this study, the ICA concept is applied to the diagnosis of a one-stage gear mechanism in which two types of defects (the eccentricity error and the localized tooth defect)are introduced. The finite element method allows determination of the signals corresponding to the acceleration in some locations of the system, and those signals may be used also in the ICA algorithm. Hence, the vibratory signatures of each defect can be identified by the ICA concept. Thus, a good agreement is obtained by comparing the expected default signatures to those achieved by the developed inverse method.

5

The gear mechanism for the Stirling engine

Podesva J., Mika J.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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2004

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z. 25

125-132

EN

The Stirling engine is the type of the gas engine which trades off the external combustion. The mechanism of the engine consists of two pistons which closes two volumes, connected together through cooler, regenerator and warmer. The effectiveness of the engine depends (except of other influences) on the piston movement regime. Standard sinusoidal movement leads to low effectiveness. The movement with quick change of the position and then short stay in the higher and lower position is more effective. The paper describes three mechanisms, managing the piston movement, and their skills with special focus to the piston movement regime.

PL

Silnik Stirlinga jest rodzajem silnika gazowego o zewnętrznym spalaniu. Mechanizm silnika składa się z dwóch tłoków zamykających dwie objętości połączonych razem przez chłodnicę, regenerator i podgrzewacz. Skuteczność silnika zależy m.in. od technicznych warunków pracy tłoka. Ruch z szybką zmianą pozycji, a następnie krótka przerwa w najwyższej i najniższej pozycji są bardziej efektywne. W artykule przedstawiono trzy mechanizmy odpowiedzialne za nich tłoka i sterujące ruchem tłoka.