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Wyświetlanie 1-15 z 97
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:
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:
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
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:
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:
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
Artykuł
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
Artykuł
Tytuł:
The specific dynamic capacity of a planetary roller screw with random deviations of the thread pitch
Autorzy:
Lisowski, F.
Powiązania:
https://bibliotekanauki.pl/articles/279397.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
planetary roller screw
specific dynamic capacity
random deviations
Opis:
The paper presents an analysis of the specific dynamic capacity of a planetary roller screw including random deviations of the thread pitch. Results are based on a statistical analysis of loads between the screw and the roller obtained for the accepted bar model to determine the load distribution. Furthermore, the finite element analysis has been applied to determine stiffness coefficients of the screw-roller and the roller-nut cooperation. The purpose of the following considerations is to assess a decrease in the specific dynamic capacity of the planetary roller screw depending on random deviations of the thread pitch.
Źródło:
Journal of Theoretical and Applied Mechanics; 2017, 55, 3; 991-1001
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:
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:
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:
The vibroacoustic methods and their application in the diagnostics of the combustion engines roller-bearing fittings
Autorzy:
Madej, H.
Stanik, Z.
Warczek, J.
Powiązania:
https://bibliotekanauki.pl/articles/246968.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
vibroacustics methods
diagnostics of roller bearing
combustion engine fittings
Opis:
The roller-bearings are the most widely used appliances of the engine's fittings. The regular use of the roller-bearings leads to their degradation and subsequently to their damage. In extreme situations, the damaged roller-bearing can come to a standstill leading to the engine's failure. As for the maintenance of the engine, it would be crucial to work out the methods of supporting the diagnosis of the engine's fittings and its elements. The methods would enable to determine the condition of measure without the need ofthe disassembly. The vibroacoustic methods present the greatest possibilities in that field. The authors attempted to realize that task for a chosen element of the combustion engine's fittings in a car. The article presents the results ofthe conducted research and the study concerning the diagnosis of the bearing's timing belt tensioner pulley. The investigation was conducted for new roller-bearings as well as damaged. Different values of tension in investigations were applied by timing belt, which were placed for help of instrument PR-20. The accelerations of radial vibrations of screw fixing the tensioner pulley were measured during experiments. The recording of accelerations of vibrations was done for different constant engine speeds. The results ofthe research were analyzed by using software MatLab. The study indicated the measure sensitive to the changes of the technical condition of the tested element. The findings obtained confirm the usefulness of the presented method which in the form of a suitable algorithm may use as the basis for creating a diagnostic device.
Źródło:
Journal of KONES; 2010, 17, 2; 293-297
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron annihilation lifetime spectroscopy study of roller burnished magnesium alloy
Autorzy:
Zaleski, R.
Zaleski, K.
Gorgol, M.
Powiązania:
https://bibliotekanauki.pl/articles/146650.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
AZ91HP magnesium alloy
defects
positron lifetime annihilation spectroscopy (PALS)
roller burnishing
Vickers hardness test
Opis:
The effect of roller burnishing on Vickers’ hardness and positron lifetimes in the AZ91HP magnesium alloy was studied. The microhardness increases with an increase in the burnishing force and with a decrease in the feed. The comparison of various methods of analysis of positron annihilation lifetime (PAL) spectra allowed identification of two components, which are related to solute-vacancy complexes and vacancy clusters, respectively. It was found that the increase in microhardness was related to the increase in the concentration of vacancy clusters.
Źródło:
Nukleonika; 2015, 60, No. 4, part 1; 789-794
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 97

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