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Wyświetlanie 1-15 z 67
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
Artykuł
Tytuł:
Anthropometry in elite roller hockey players
Antropometría en jugadores de élite de hockey patines
Autorzy:
Martín, Eduard Romero
Marquez, Bernat de Pablo
Almeida, Tiago Garcia
Powiązania:
https://bibliotekanauki.pl/articles/1491426.pdf
Data publikacji:
2020-04-22
Wydawca:
Atena Research Association
Tematy:
Roller hockey
Anthropometry
Sport Sciences
Opis:
Objectives: The aims of the present study were to identify the anthropometric variables in elite roller hockey players in the 21st century and to compare the results with other indoor sports with similar somatotype. Methods: A descriptive study was performed in 41 elite roller hockey male players (mean age 25.63 ± 4.76 years, age range 19-34 years), including anthropometric measures, body composition and somatotype. A bibliographic review about roller hockey anthropometry was performed, including also other similar sports (field hockey and ice hockey). The results of the articles found were compared with the results obtained in our study. Also, a comparison between goalkeepers (n=8) and field players (n=33) results was performed. Results: The anthropometric results in this study showed higher values in height, weight and body mass index in comparison with previous articles about roller hockey anthropometry, showing similarities with the values of ice hockey players. In our sample, goalkeepers showed higher values of weight, body fat percentage and body mass index than field players. Conclusions: We concluded that 21st century elite roller hockey players are taller and heavier than those players studied in previous articles.
Źródło:
Atena Journal of Sports Sciences; 2020, 2; 4-4
2695-4486
Pojawia się w:
Atena Journal of Sports Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Problematics of reliability of road rollers
Autorzy:
Stawowiak, M.
Kuczaj, M.
Powiązania:
https://bibliotekanauki.pl/articles/409921.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Tematy:
exploitation
reliability
operation process
road roller
Opis:
This article refers to the reliability of road rollers used in a selected roadworks company. Information on the method of road rollers service and how the service affects the reliability of these rollers is presented. Attention was paid to the process of the implemented maintenance plan with regard to the machine's operational time. The reliability of road rollers was analyzed by determining and interpreting readiness coefficients.
Źródło:
Management Systems in Production Engineering; 2018, 2 (26); 124-128
2299-0461
Pojawia się w:
Management Systems in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Steady periodic regime of rotary motion of rollers in vibrating classifiers
Obszar ustalonego okresowego ruchu obrotowego rolek drgającego sortownika
Autorzy:
Ostapenko, V. A.
Naduty, V. P.
Yagnyukov, V. F.
Powiązania:
https://bibliotekanauki.pl/articles/281776.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
sortowniki
rolki
rotacje
classifier
roller
rotation
Opis:
The problem of dynamics of vibrating classifiers with rollers intended for sorting of loose materials is considered in the paper. The main goal of research consists in substantiation of a choice of such parameters of rollers and classifiers which provide a steady periodic mode of rollers rotation. Differential equations of rollers rotation under action of inertial forces are essentially nonlinear. These equations are transformed to equations concerning the value of delay of moving rollers concerning rotation of axles on which these rollers are freely suspended. As values of such delays is small, the equations of motion can be linearized with a sufficient degree of accuracy. The linearized equations represent the inhomogeneous Hill equations, which can be under certain conditions transformed into the Mathieu equations. Periodic solutions to these equations are obtained, and also stability of these solutions is investigated.
W pracy zaprezentowano problem dynamiki drgającego sortownika przeznaczonego do materiałów sypkich. Głównym celem analizy jest znalezienie i uzasadnienie takiego wyboru parametrów konstrukcyjnych sortownika, które zapewnią ustalony i okresowy stan pracy rolek. Równania ruchu są nieliniowe. W pracy dokonano przekształcenia równań tak, aby opisywały opóźnienie ruchu rolek w stosunku do rotacji względem osi, na których te rolki zamocowano. Przy niewielkich wartościach tego opóźnienia, równania ruchu mogą być zlinearyzowane z utrzymaniem wystarczającej dokładności. Linearyzacja prowadzi do równań Hilla, które przy spełnieniu pewnych warunków mogą zostać przekształcone do postaci Mathieu. W artykule przedstawiono rozwiązania tych równań oraz zbadano ich stabilność.
Źródło:
Journal of Theoretical and Applied Mechanics; 2008, 46, 1; 157-169
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of the Acoustic Microclimate in the Zone of the Switch Unit in the Heavy Roller Conveyor Line – Case Study
Autorzy:
Sokolski, Marek
Powiązania:
https://bibliotekanauki.pl/articles/504594.pdf
Data publikacji:
2013
Wydawca:
Międzynarodowa Wyższa Szkoła Logistyki i Transportu
Tematy:
heavy-duty roller conveyors
noise hazards
Opis:
The sign of the so-called human engineering policy introduced in the industry is decreasing the occupational hazards and making the workplaces as comfortable as possible. That tendency finds expression in the tightened industrial safety-code. Among the annoying /damaging physical factors occurred in the workplace environment, the noise is of especially great importance. One of the most active noise sources in the warehouse systems are the conveyor lines for continuous transport of palletized load units. The measurement results of the main acoustic quantities in the zone of the heavy switch unit in the roller conveyor line are presented. The noise hazards, the speech intelligibility and the perception of the warning acoustic signal in this area are determined.
Źródło:
Logistics and Transport; 2013, 20, 4; 49-56
1734-2015
Pojawia się w:
Logistics and Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rolling bearing dynamics and diagnostic
Autorzy:
Yawlensky, A.
Powiązania:
https://bibliotekanauki.pl/articles/327354.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
vibrations
diagnosis
roller bearing
prediction
quality
Opis:
Questions connecting the problems of the dynamics analysis, identification and diagnosing the systems with the problems of changing their during manufacturing and operation are considered. Theoretical as-pects of this problem are presented as diagnosing the systems reodynamics. The systems are the objects consisting of a great number of interworking elements such load-bearing ones including elements of con-struction, connection, transfer, engines, etc. Elements mutual interaction and their relative transfer cause vibrations which are significantly amplified if defects are available. It primarily concerns the systems with rotating details, for instance, reducers. Supports and gear wheels are the basic sources of vibrations in reducers. Vibration parameters, and their spectral characteristics in particular, may serve as information signals about internal unobserved processes.
Źródło:
Diagnostyka; 2004, 30, T. 2; 199-203
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
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
Artykuł
Tytuł:
Analysis of the project of innovative floating turbine
Autorzy:
Tomporowski, Andrzej
Al-Zubiedy, Ali
Flizikowski, Józef
Kruszelnicka, Weronika
Bałdowska-Witos, Patrycja
Rudnicki, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/258504.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
design
innovative aeration unit
water roller drive
Opis:
The design of a floating, innovative device for river water aeration and conversion of mechanical energy to electrical energy required the analysis of a number of geometrical and dynamic features. Such an analysis may be carried out on the basis of existing methods of numerical fluid mechanics. Models of pressures, forces and torques characteristic for the conversion of watercourse energy were developed for two basic concepts of innovation. These pressures, forces and torques were calculated, designed, and experimentally determined for the variable geometric form and dimensions of the designed working elements of the innovative roller-blade turbine rotor.
Źródło:
Polish Maritime Research; 2019, 4; 124-133
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anthropometric study in the players of the Spanish Female Team of Roller Hockey
Estudio antropométrico en las jugadoras de la Selección Española de Hockey Patines
Autorzy:
Martin, Eduard Romero
Marquez, Bernat de Pablo
García, Jesús Bernardo
Sánchez, Josep Salvador
Powiązania:
https://bibliotekanauki.pl/articles/1491352.pdf
Data publikacji:
2020-07-17
Wydawca:
Atena Research Association
Tematy:
Roller hockey
Female athletes
Anthropometry
Sport sciences
Opis:
Objectives: The objectives of the present study were: a) to analyze anthropometric variables in female elite roller hockey players b) to compare the results with other sports with similar somatotype (ice hockey, field hockey). Methods: A descriptive study was performed in 16 roller hockey players from the Spanish National Team (age range 16-30 years, mean age 21.8 ± 4.1), including anthropometric measures, body composition and somatotype. A literature review about roller hockey anthropometry was performed and other similar sports were also considered (field hockey and ice hockey). Findings: The anthropometric results showed similar height and weight parameters in comparison to previous articles about female roller hockey players, showing also similarities with ice hockey players.  In our sample, goalkeepers (n=3) and field players (n=13) showed no significant differences in anthropometric values. Conclusions: The results of our study provide anthropometric reference values for elite roller hockey players.
Źródło:
Atena Journal of Sports Sciences; 2020, 2; 6-6
2695-4486
Pojawia się w:
Atena Journal of Sports Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
How to diminish the wear for chains which are tight on the sprockets
Jak zmniejszyć zużycie łańcuchów, które ciasno przylegają do zębatki
Autorzy:
Voinov, K.
Powiązania:
https://bibliotekanauki.pl/articles/197269.pdf
Data publikacji:
2015
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
bush-roller chain
sprocket
stretchers
łańcuch
zębatka
napinacz
Opis:
The speech in this article is going about the standard bush-roller chain for bicycle, machine-tool or for conveyor. And the chain can be settled in the different spatial position, namely in vertical, horizontal or in the slope. In all these cases we have to stretch the chain periodically because of wear during the operation. For this aim the people apply different contact methods: spring-loaded rollers, flat springs (as a pair of friction), stretchers and so on [2, 3]. But here we describe a new way how to stretch the chain constantly and without any additional pairs of friction at all [1, 2, 3] using only magnet. It simplified design and enhanced the resistance against wear essentially.
W tym artykule mowa będzie o standardowym tulejkowym łańcuchu dla rowerów, obrabiarek lub do ciągnienia. Łańcuch może być osadzony w różnej pozycji przestrzennej, czyli w pionie, poziomie lub po skosie. We wszystkich tych przypadkach trzeba rozciągać łańcuch okresowo, ze względu na zużycie w czasie eksploatacji. Do tego celu ludzie stosują różne metody kontaktowe: wałki sprężynowe, sprężyny płaskie (jako parę tarcia), napinacze i tak dalej [2, 3]. W artykule opisano nowy sposób, jak rozciągać łańcuch stale oraz bez użycia dodatkowych par tarcia [1, 2, 3] jedynie przy użyciu magnesu. To istotnie uprościło konstrukcję oraz zwiększyło odporność na zużycie.
Źródło:
Zeszyty Naukowe. Transport / Politechnika Śląska; 2015, 86; 109-115
0209-3324
2450-1549
Pojawia się w:
Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance optimization of multi-roller flat burnishing process in terms of surface properties
Autorzy:
Le, Minh-Thai
Van, An-Le
Nguyen, Trung Thanh
Powiązania:
https://bibliotekanauki.pl/articles/24084649.pdf
Data publikacji:
2023
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
roller burnishing
average roughness
Brinell hardness
process parameter
Opis:
In the current investigation, two primary indicators, including the average roughness (AR) and Brinell hardness (BH) of the roller burnishing operation are enhanced using the optimal inputs (the spindle speed-S, feed rate-f, and depth of penetration-D). The performance measures are developed using the Kriging approach and optimal outcomes are generated by the Crow Search Algorithm (CSA). The optimal outcomes generated by the CSA of the S, f, and D were 832 rpm, 112 mm/min, and 0.12 mm, while the AR was reduced by 37.0% and the BH was increased by 29.9%, respectively. The optimal findings could be utilized in the practice for enhancing the burnished quality and to develop a professional system related to the roller burnishing operation. The Kriging-based AR and BH correlations could be used to present nonlinear experimental data. The optimizing technique could be utilized to deal with optimizing problems for different machining operations.
Źródło:
Journal of Machine Engineering; 2023, 23, 2; 159--173
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research of air movement in the labyrinth seal of rollers of conveyor belt
Autorzy:
Kononov, G.
Artemov, S.
Dubrovskyi, S.
Kravtsova, D.
Powiązania:
https://bibliotekanauki.pl/articles/139846.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
roller housing
bearings
labyrinth seal
belt conveyor
modeling
Opis:
In the paper, the authors present the solution aimed at increasing reliability of the conveyor units. The analysis of technological and operational defects of conveyor rollers is presented. The changes in manufacturing technology have been proposed, which allowed for avoiding welding and provided the required level of tightness. Computer simulation of the motion of air in the labyrinth seal of the roller was conducted to determine the numerical parameters of possible airflows. It is proved that the airflow is present in the gap of the labyrinth seal due to the roller rotation. It is shown that the reason for the penetration of abrasive particles through the labyrinth seal after stopping is decompression, which occurred as a result of temperature change and push out of airflows during rotation. It is also suggested that the number of stops during the operation should be taken into account when determining the durability of rollers. Practical recommendations are given for preventing the penetration of abrasive particles during conveyor stops and the need for combined seals. The results can be used for the construction of roller conveyor belts in any industry.
Źródło:
Archive of Mechanical Engineering; 2019, LXVI, 4; 439-445
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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