Wszystkie pola: roller - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Przegląd konstrukcji wałów uprawowych stosowanych indywidualnie i w agregatach
Design overview of cultivation rollers used individually and in aggregates
Autorzy:: Talarczyk, Włodzimierz
Łowiński, Łukasz
Szulc, Tomasz
Powiązania:: https://bibliotekanauki.pl/articles/1196090.pdf
Data publikacji:: 2020-12-30
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych
Tematy:: wał uprawowy
zagęszczanie gleby
kruszenie gleby
wał pierścieniowy
wał pryzmatyczny
wał oponowy
wał gumowy
wał sprężynowy
cultivation roller
soil compaction
soil crushing
ring roller
prism roller
spring roller
tire roller
rubber roller
Opis:: Wały uprawowe mają duży wpływ na kształtowanie struktury gleby przez jej kruszenie i zagęszczanie, a stosowane są indywidualnie i w agregatach z innymi narzędziami. Indywidualnie powszechnie stosowane są między innymi wały Cambridge i Crosskill, we współpracy z pługami wały Campbell, a w agregatach uprawowych i uprawowo-siewnych różnego rodzaju wały strunowe czy wały zębate nazywane Packerami, ale oferta producentów jest znacznie bogatsza. Rozwój konstrukcji wałów wynika przede wszystkim z rozwoju agregatów uprawowych i uprawowo-siewnych, przystosowywania wałów do pracy w różnych warunkach glebowych oraz z poszukiwania lżejszych i tańszych rozwiązań. Na podstawie przeglądu oferty producentów przedstawiono przykłady różnych rozwiązań sekcji roboczych wałów pierścieniowych, sprężynowych, oponowych i gumowych.
Cultivation rollers have a large impact on shaping the soil structure by crushing and compacting it, and they are used individually and in aggregates with other tools. Individually, the Cambridge and Crosskill rollers are commonly used, in cooperation with the plows, Campbell rollers, and in cultivation and sowing aggregates various types of string roll-ers or toothed rollers called Packers, but the manufacturers' offer is much wider. The development of the roller design is mainly due to the development of cultivation and cultivation-sowing units, adapting the embankments to work in var-ious soil conditions and the search for lighter and cheaper solutions. Based on the review of the manufacturers' offer, examples of various solutions of working sections of ring, spring, tire and rubber rollers are presented.
Źródło:: Technika Rolnicza Ogrodnicza Leśna; 2020, 2; 9-13
1732-1719
2719-4221
Pojawia się w:: Technika Rolnicza Ogrodnicza Leśna
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Effect of different roller end-flange constructions on the fatigue life of the cylindrical roller bearings: A novel flange deformation formula
Autorzy:: Bayrak, Ramazan
Sagirli, Ahmet
Powiązania:: https://bibliotekanauki.pl/articles/28328272.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:: cylindrical roller bearing
roller end-flange design
fatigue life
misalignment
Opis:: This paper performs the fatigue life analysis of the radial Cylindrical Roller Bearings (CRBs) with consideration of various roller end-flange shapes such as toroidal-toroidal, spherical-toroidal, and spherical-conical. A novel formula for each flange contact deformation in cylindrical roller bearing with different roller end-flange geometry including toroidal geometry is developed. Inner ring misalignment angle and radial deflection results obtained from the present study are verified with numerical and experimental results from the literature. The results approach to that of literature when the flange is changed from toroidal geometry to conical geometry. Using formulas developed in the present study, the effect of various roller end-flange geometries on the bearing life is investigated for different external loadings. It is observed that the bearing life increases when the roller end and flange are changed to toroidal geometry.
Źródło:: Eksploatacja i Niezawodność; 2023, 25, 4; art. no. 174296
1507-2711
Pojawia się w:: Eksploatacja i Niezawodność
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Decreasing of movable masses in valve timing using roller tappet
Autorzy:: Warda, B.
Siczek, K.
Powiązania:: https://bibliotekanauki.pl/articles/247946.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: valve timing
lightweight camshaft
roller tappet
Opis:: The method for reduction of valve timing movable masses, by the use of composite cams for camshaft, which mate with roller tappet, is presented. It has been carried out an analysis of stresses under the surface of the cam using the methodology and computer programs allowing the synthesis and analysis of the cam mechanism, and to estimate the fatigue life, as well as using the finite element method. Mating roller tappets with a light camshaft, forged from TiAl alloy, can be done if the camshaft has steel caps set under the pressure on the surfaces their cams. The problem, however, is the formation of high stress in the Bielaiev point, when a roller tappet mates with segment cam. Because of the certainty for the cap fixing, it is assumed that the depth for the Bielaiev point should not exceed half the thickness of the cap. The stress analysis shows, that exceeding of the material yield strength is controlled by the interference value between the cam and its cap and by the apex radius of the cam. Effect of contact stress is at least an order of magnitude smaller. The maximum depth of the Bielaiev point does not exceed 0.09 mm, which is about half the thickness of the proposed cap. There is a need not for too small radii between the cam and the apical cap. Optimal selection of proper geometry of the cam will be easier after a proper modification of the program used for the synthesis and analysis of the cam mechanism, such that it is possible to ask any operational surface of the cam profile.
Źródło:: Journal of KONES; 2012, 19, 1; 473-481
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Analysis of roller bearing cages
Autorzy:: Kohar, R.
Krzysiak, Z.
Lukac, M.
Brumercik, F.
Powiązania:: https://bibliotekanauki.pl/articles/132167.pdf
Data publikacji:: 2016
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: computer simulation
dynamic analysis
mathematical models
roller bearings
Opis:: The aim of this paper is to detail the creation of a roller bearing model with flexible body cages in the Adams program suite for subsequent dynamic analysis and to obtain information about kinematic and dynamic relationships of steel and plastic cages under various operating conditions. The bearing model was made to closely resemble its real-life counterpart, which allows us to estimate load conditions, dynamic conditions of individual bearing parts and interactions between them.
Źródło:: Advanced Technologies in Mechanics; 2016, 3, no. 2 (7); 2-11
2392-0327
Pojawia się w:: Advanced Technologies in Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Numerical Analysis of Roller Bearing
Autorzy:: Kohár, R.
Brumerčík, F.
Lukáč, M.
Nieoczym, A.
Powiązania:: https://bibliotekanauki.pl/articles/117746.pdf
Data publikacji:: 2016
Wydawca:: Polskie Towarzystwo Promocji Wiedzy
Tematy:: tapered roller bearings
dynamic simulation
axial load force
Opis:: The aim of this paper is to detail the creation of a large tapered roller bearing model with flexible body cages in the Adams program suite for subsequent dynamic analysis and to obtain information about kinematic and dynamic relationships of steel and plastic cages under various operating conditions. The bearing model was made to closely resemble its real-life counterpart, which allows us to estimate load conditions, dynamic conditions of individual bearing parts and interactions between them.
Źródło:: Applied Computer Science; 2016, 12, 1; 5-16
1895-3735
Pojawia się w:: Applied Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: The issue of selection: shape and volume of briquettes agglomerated in a roller press
Autorzy:: Bembenek, M.
Powiązania:: https://bibliotekanauki.pl/articles/243797.pdf
Data publikacji:: 2017
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: roller press
briquettes
simulation
volume of briquettes
Opis:: A volume and a shape of the briquettes agglomerated in a roller press depend largely on the material properties, the design features of a roller press, and it is a complicated issue. Correctly, selected geometric parameters of the briquettes determine the proper strength of the consolidated product. The paper presents the laboratory and simulation experiments conducted to obtain knowledge about volume and shape of the roller press briquettes. The main elements of the roller press compacting unit are the forming rollers. They are located horizontally in some roller presses of low efficiency they can be placed vertically. The shape of working surface, the volume of the melding cavities and the characteristics of the briquetted material have an important role in terms of the effects of the briquetting process especially the cost of operating of the roller press. The paper presents the description of the basic shapes of forming surfaces used in the roller presses and it systematises the knowledge of the shape and volume of briquettes produced in the roller presses on the basis of own laboratory and simulation researches. The information contained in the article can be very useful for designers of roller presses and their users. Further work should be continued to verify the results of tests on other materials and laboratory conditions.
Źródło:: Journal of KONES; 2017, 24, 2; 31`-38
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Urządzenia rolkowe do kontroli działania hamulców
Roller devices for brakes working control
Autorzy:: Sitek, K.
Powiązania:: https://bibliotekanauki.pl/articles/329346.pdf
Data publikacji:: 2005
Wydawca:: Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:: układy hamulcowe
diagnostyka
urządzenia rolkowe
braking systems
diagnostics
roller devices
Opis:: Opisano przeznaczenie i budowę urządzeń rolkowych do kontroli działania hamulców samochodów osobowych, ciężarowych i uniwersalne wytwarzanych przez firmę Unimetal. Przedstawiono podstawowe dane techniczne tych urządzeń. Podano mierzone i obliczane parametry diagnostyczne służące do oceny stanu układu hamulcowego. Wymieniono wyposażenie dodatkowe oferowane przez producenta oraz zasady zabudowy urządzeń na stanowiskach kontrolnych stacji diagnostycznych. Odniesiono się do metodyki badania układów hamulcowych w Polsce i innych krajach Unii Europejskiej.
The assignment and construction of Unimetal's roller devices for brakes working inspection of cars, trucks and universal have been described. The basic technical data of those devices has been presented. Measured and calculated diagnostic parameters for brake unit condition estimation have been given. Additional equipment offered by producer and devices' development rules on control stands of diagnostic inspection stations have been listed. It has been referred to brake unit control methodology in Poland and other European Union countries.
Źródło:: Diagnostyka; 2005, 33; 157-162
1641-6414
2449-5220
Pojawia się w:: Diagnostyka
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: The computational model of the load distribution between elements in a planetary roller screw
Autorzy:: Ryś, J.
Lisowski, F.
Powiązania:: https://bibliotekanauki.pl/articles/281004.pdf
Data publikacji:: 2014
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: planetary roller screw
computational model
load distribution
Opis:: The paper presents a computational model of the load distribution between elements in a planetary roller screw. The idea of the model is to consider the deformations of rolling elements as deformations of rectangular volumes subjected to shear stresses. The contact deformations of threads and the deformations of screw and nut cores are taken into account by a properly chosen shear modulus. This modulus is computed on the basis of stiffness determined using the finite element method. Based on the relation between displacements and forces differential equations are obtained. The solution to these equations is a hyperbolic function that illustrates the load distribution on the threads between cooperating elements. The following considerations are carried out to assess the suitability of the analytical model for the preliminary design and analysis of this type of transmissions.
Źródło:: Journal of Theoretical and Applied Mechanics; 2014, 52, 3; 699-705
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Pallet motion on a magnetic brake roller
Autorzy:: Sharifullin, Ildar
Nosko, Andrey
Safronov, Eugene
Powiązania:: https://bibliotekanauki.pl/articles/2106203.pdf
Data publikacji:: 2022
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:: pallet
rack
gravity flow rack
magnetic brake roller
coefficient of magnetic viscosity
Opis:: The brake roller is one of the elements for the safe operation of gravity flow pallet racks. The brake roller of the magnetic (eddy current) type magnetic brake roller (MBR) is the most promising brake type. The working principle of the MBR is based on electromagnetic induction laws, according to which the braking of a conductor moving in the magnetic field is caused by the interaction of the conductor's eddy currents with the external magnetic field. In the paper, a mathematical model of the pallet motion on an MBR was developed. The equation of motion of the pallet on the MBR was derived. The calculation results were compared with the results of experimental studies of the pallet motion velocity on the MBR. For pallet speed under “drag peak” speed, the error of the mathematical model is <7.7%, and the error starts increasing once over the “drag peak” speed. Additional investigation of the coefficient of magnetic viscosity for speeds greater than the “drag peak” speed is required.
Źródło:: Acta Mechanica et Automatica; 2022, 16, 1; 34--39
1898-4088
2300-5319
Pojawia się w:: Acta Mechanica et Automatica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Modeling and simulation of vertical roller mill using population balance model
Autorzy:: Fatahi, Rasoul
Barani, Kianoush
Powiązania:: https://bibliotekanauki.pl/articles/1449686.pdf
Data publikacji:: 2020
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: vertical roller mill
modeling
simulation
cement grinding
residence time distribution
Opis:: There are few studies concerning the process simulation of vertical roller mills (VRMs). In this research work, the application of population balance model for simulation of a VRM in a cement clinker grinding circuit was investigated. The residence time distribution (RTD) was measured, and the tank-in-series and Weller models were employed to describe the residence time distribution. Two sampling surveys were carried out on the VRM circuit. The data from the first survey were used for model calibration, and the specific breakage rates were back-calculated. The model parameters obtained were used for simulation of the second survey, and validation of the model. The results showed that the clinker particle spent a short time inside the VRM and the mean residence time is about 67s. The tanks-in series model compares to Weller model was more proper to describe the residence time distributions in the VRM. The simulation results showed that the specific breakage rates increased with increasing particle size. However, the particles larger than 25.4 mm particles sizes are too large to be properly nipped by master rollers. Finally, it can be concluded that the grinding process of the VRM is very well-predictable with the population balance model.
Źródło:: Physicochemical Problems of Mineral Processing; 2020, 56, 1; 24-33
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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