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Tytuł:
Crack growth diagnostic of ball bearing using vibration analysis
Autorzy:
Belaidi, S.
Lecheb, S.
Chellil, A.
Mechakra, H.
Safi, B.
Kebir, H.
Powiązania:
https://bibliotekanauki.pl/articles/2174182.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
łożysko kulkowe
drgania
pękanie
zmęczenie
ball bearing
vibration analysis
frequency
cracking
diagnosis
fatigue life
Opis:
It is known that supported ball bearings have great effects on the vibrations of the gear transmission system, above in all the presence of local faults as well as the crack growths. For this purpose, this paper focuses on shock and vibration crack growth diagnostic of ball bearing using vibration analysis. Our work is devoted first to a study the static behaviour of the ball bearing by determining the stress, strain and displacement, then its dynamic behaviour by determining the first four natural frequencies. Secondly, a dynamic analysis study of the bearing was carried with defects as a function of crack size and location. The obtained results clearly show that the natural frequencies decrease in a non-linear way with the growth of the length of the crack, on the other hand the stress increases with the presence of the singular points of the crack. Finally, this residual decrease in natural frequencies can be used as an indicator of the state of failure, as well as a parameter used for the diagnosis and screening, and to highlight the fatigue life of the bearing.
Źródło:
International Journal of Applied Mechanics and Engineering; 2022, 27, 1; 35--45
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computer simulation of pressing a ceramic ball into elastic-plastic material
Autorzy:
Berczyński, S.
Grochała, D.
Grządziel, Z.
Powiązania:
https://bibliotekanauki.pl/articles/135649.pdf
Data publikacji:
2015
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
computer simulation
ceramic ball
elastic-plastic material
burnishing
Hertzian stresses
deformations
contact
Opis:
This article describes distributions of stresses and strains created by pressing a ball with 80 HRC hardness into soft 35HRC steel, which occurs in the technological process of burnishing. We present a computer model and a solution developed with the Nastran FX program, based on the finite elements method. The validity of the model has been checked using a small force applied on the ball, within the range of elastic deformations, where Hertz formulas are applicable. Then computations have been made for a pressure force of 30 000 N, which corresponds to hardness testing conditions by the Brinell method. The dimensions of plastic indentations from simulations and experiments are compared.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 42 (114); 9-13
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of feed particle size on breakage rate parameter in a pilot scale ball mill
Wpływ rozmiaru ziaren nadawy na szybkość przemiału w półprzemysłowym młynie kulowym
Autorzy:
Erdem, S. A.
Ergun, L. S.
Benzer, H. A.
Powiązania:
https://bibliotekanauki.pl/articles/2070460.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
mielenie
młyn kulowy
szybkość rozdrabniania
rozmiar ziaren nadawy
cement
grinding
ball mill
breakage rate
feed particle size
Opis:
The paper presents investigation results of feed particle size effects on the breakage ratę parameter in a pilot-scale ba]] mili. The specific ratę of breakage was calculated for each test by modelting of grinding process in a milt. The resutts revealed that breakage ratę increased with the increase of particle size within a certain size rangę and then de-creased despite the further increase of particle size. This tendency takes a similar pattern irrespective of a top ball size but the particle size at maximum breakage occurred as dependent on a top bali size in all tests. Consequent)y, the feed particle size is strongly related to the top baH size in bali media, which allows one to achieve optimum mili per-formance.
Artykuł przedstawia rezultaty badań, w półprzemysłowym młynie kulowym, wpływu rozmiaru ziaren nadawy na szybkości rozdrabniania. Rozdrabnianie prowadzono w sposób okresowy. Następnie określono szybkość rozdrabniania, modelując proces mielenia. Wyniki badań dla wszystkich testów pokazały, że szybkość rozdrabniania wzrasta wraz ze wzrostem wielkości ziarna, w określonym przedziałe rozmiarowym, a następnie spada pomimo wzrostu wymiaru ziarna. Największe szybkości przemiału występują dla największych kuł, we wszystkich prowadzonych testach. Wskazuje to również, iż rozmiar ziaren jest silnie uzależniony od rozmiaru największych mielników, które pozwalają uzyskać optymalne warunki mielenia.
Źródło:
Inżynieria i Aparatura Chemiczna; 2009, 4; 34-37
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic behavior of a rotor supported by angular ball bearings
Autorzy:
Abbes, M. S.
Hentati, T.
Maatar, M.
Fakhfakh, T.
Haddar, M.
Powiązania:
https://bibliotekanauki.pl/articles/327818.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
łożysko kulkowe skośne
wirnik
analiza dynamiczna
angular ball bearing
rotor
dynamic analysis
bearing interaction
Opis:
The wide range and large scale usage of rolling bearings indicates their necessity and vital contribution to the performance of modern industries. In this paper, a non linear model, predicting mechanical behavior of the loaded angular ball bearing, have been developed. The dynamic behavior of a rotor supported by two angular ball bearings is analyzed. The finite element method is used and the rotor is decritizied on beam elements. A mathematical modal taking account different sources of non linearity: the Hertzian contact force and the action of all balls on the bearings inner races, is developed. The Newmark algorithm coupled with Newton Raphson iterative method is used to solve the non linear differential equation iteratively.
Źródło:
Diagnostyka; 2009, 3(51); 3-8
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A peculiarity of determining a static carrying capacity for the one-row ball slewing bearing loaded the large radial force
Autorzy:
Śpiewak, S.
Powiązania:
https://bibliotekanauki.pl/articles/246680.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
slewing bearing
one row ball slewing bearing
radial force
axial force
tilting moment
curve of the static carrying capacity
numerical modelling
Opis:
Slewing bearings are applied commonly in the following devices inter alia: harbour cranes, traveling cranes, radar stations, machinery underground and an opencast mining, armaments industry, building machines, medical analysis devices, rotary kilns, manufacturing systems, a power engineering. A static limiting load curve of the slewing bearings describes ranges of the allowable loads, which the bearing can be safely carried for assumption by a manufacturer durability. The static carrying capacity of a slewing bearing describe the relationship between a tilting moment M and an axial force Fa for assumed a value of a radial force Fr. The article concerns problems related to catalo selection of rolling bearings which are loaded the large radial forces which may by differently directed in relation to a tilting moment's vector. Manufactures of the slewing bearings mostly does not present in product catalogs of a static limiting load curve, which have taken into account an action the radial forces. According to an INA company, the radial forces are reduced to determining an equivalent tilting moment and an equivalent axial force. In this work, the static limiting load curves have been determined based on the FEM models, the equations of contact mechanics for the ball and the bearing raceway. The models were performed by use the ADINA system. Juxtaposition of results obtained on a basis of method's INA company and own model have been presented in form the static limiting load curves. The object of the analysis was the one row ball slewing bearing, domestic production, which is used in excavator type F250H.
Źródło:
Journal of KONES; 2016, 23, 3; 533-540
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical Analysis for a New Tennis Ball Launcher
Autorzy:
Wójcicki, K.
Puciłowski, K.
Kulesza, Z. S.
Powiązania:
https://bibliotekanauki.pl/articles/386374.pdf
Data publikacji:
2011
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
wyrzutnia
trajektorie
analiza matematyczna
launcher
trajectories
mathematical analysis
Opis:
The paper presents the mathematical analysis for the design of a new tennis ball launcher in order to assess the possibilities for its technical implementation. First, traditional launchers are described. Next, several new requirements improving training possibilities of such machines are suggested. The motion equation of the flying tennis ball is formulated and numerically solved. This makes it possible to analyze the trajectories of the ball for different initial conditions: elevation and heading angles, as well as the rollers angle. Then, the mathematical analysis of the launcher with two counter rotating rollers is presented. Stiffness (Young's) modulus and friction coefficients for the typical tennis ball have been determined ex-perimentally. Based on these, initial conditions for the throw have been found: rotating speeds of the rollers and powers of the driving motors.
Źródło:
Acta Mechanica et Automatica; 2011, 5, 4; 110-119
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of laboratory conditions effect on prediction accuracy of size distribution of industrial ball mill discharge by using a perfect mixing model. A case study: Ozdogu copper-molybdenum plant
Autorzy:
Gharehgheshlagh, H. H.
Ergun, L.
Chehreghani, S.
Powiązania:
https://bibliotekanauki.pl/articles/110599.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
ball mill scale-up
perfect mixing model
particle size distribution
simulation
Opis:
In this study, the perfect mixing model was used to investigate its accuracy level, under different laboratory conditions, in predicting the particle size distribution of industrial ball mills discharges. For this purpose, data sets of two laboratory ball mills with eight different compositions of balls and two industrial mills of a copper processing plant for seven different tonnages, which totally included 56 simulation operations, were used. For simulation, the necessary data were obtained through performing the breakage distribution function and kinetic grinding tests using laboratory mills. The results were used to determine the first order grinding kinetics and normalized breakage rate parameters. For the industrial scale, the simulation process was carried out using data, perfect mixing model equations and JKSimMet software. The results showed that the operating conditions of the laboratory mills were quite affected by the predictive power of the desired model. Comparing the measured and simulated values of P80, it is clear that 2 minutes of first order grinding using the Bond laboratory ball mill with standard operating conditions and single size ball load of 20 mm provided the best prediction with trivial errors, less than 10%, for all seven tonnages of the industrial mills. The results of this study together with more investigations on different plants can be helpful in optimization, simulation and scale-up procedures of ball mills.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 2; 1175-1187
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lessons learned in a ball fetch-and-carry robotic competition
Autorzy:
Cigolini, M.
Costalunga, A.
Parisi, F.
Patander, R.
Salsi, I.
Signifredi, A.
Valeriani, D.
Rizzini, D. L.
Caselli, S.
Powiązania:
https://bibliotekanauki.pl/articles/385072.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
Robotic Competition
Opis:
Robot competitions are effective means to learn the issues of autonomous systems on the field, by solving a complex problem end-to-end. In this paper, we illustrate Red Beard Button, the robotic system that we developed for the Sick Robot Day 2012 competition, and we highlight notions about design and implementation of robotic systems acquired through this experience. The aim of the contest was to detect, fetch and carry balls with an assigned color to a dropping area, similarly to a foraging navigation task. The developed robotic system was required to perceive colored balls, to grasp and transport balls, and to localize itself and navigate to assigned areas. Through extensive experiments the team developed an initial prototype, discovered pitialls, revised the initial assumptions and design decisions, and took advantage of the iteration process to perform successfully at the compe tition.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2014, 8, 1; 82-90
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A radial version of the Kontorovich-Lebedev transform in the unit ball
Autorzy:
Yakubovich, S. B.
Vieira, N.
Powiązania:
https://bibliotekanauki.pl/articles/255671.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Kontorovich-Lebedev transform
modified Bessel function
index transforms
Fourier integrals
Opis:
In this paper we introduce a radial version of the Kontorovich-Lebedev transform in the unit ball. Mapping properties and an inversion formula are proved in Lp.
Źródło:
Opuscula Mathematica; 2011, 31, 1; 137-146
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
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