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Wyświetlanie 1-15 z 54
Tytuł:
Pressure and velocity distribution in slide journal bearing lubricated micropolar oil
Autorzy:
Krasowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/247206.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
micropolar lubrication
journal bearing
hydrodynamic pressure
velocity
velocity of microrotation
Opis:
Present paper shows the results of numerical solution Reynolds equation for laminar, steady oil flow in slide bearing gap. Lubrication oil is fluid with micropolar structure. Materials engineering and tribology development helps to introduce oils with the compound structure (together with micropolar structure) as a lubricating factors. Properties of oil lubrication as of liquid with micropolar structure in comparison with Newtonian liquid, characterized are in respect of dynamic viscosity additionally dynamic couple viscosity and three dynamic rotation viscosity. Under regard of build structural element of liquid characterized is additionally microinertia coefficient. In modelling properties and structures of micropolar liquid one introduced dimensionless parameter with in terminal chance conversion micropolar liquid to Newtonian liquid. The results shown on diagrams of hydrodynamic pressure, velocity and velocity of microrotation distribution in dimensionless form in dependence on coupling number N2 and characteristic dimensionless length of micropolar fluid A1. Differences were showed on graphs in the schedule of the circumferential velocity oils after the height of the gap in the flow of the micropolar and Newtonian liquid. In presented flow, the influence of lubricating fluid inertia force and the external elementary body force field were omitted. Presented calculations are limited to isothermal models of bearing with infinite length.
Źródło:
Journal of KONES; 2011, 18, 4; 213-220
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pressure and velocity distribution in slide journal plane bearing lubricated with micropolar oil
Autorzy:
Krasowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/246956.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
micropolar lubrication
journal plane bearing
hydrodynamic pressure
velocity
velocity of microrotation
Opis:
Present paper shows the results of numerical solution Reynolds equation for laminar, steady oil flow in slide plane bearing gap. Lubrication oil is fluid with micropolar structure. Materials engineering and tribology development helps to introduce oils with the compound structure (together with micropolar structure) as a lubricating factors. Properties of oil lubrication as of liquid with micropolar structure in comparison with Newtonian liquid, characterized are in respect of dynamic viscosity additionally dynamic couple viscosity and three dynamic rotation viscosity. Under regard of build structural element of liquid characterized is additionally microinertia coefficient. In modelling properties and structures of micropolar liquid one introduced dimensionless parameter with in terminal chance conversion micropolar liquid to Newtonian liquid. The results shown on diagrams of hydrodynamic pressure, velocity and velocity of microrotation distribution in dimensionless form in dependence on coupling number N2 and characteristic dimensionless length of micropolar fluid Lambda 1. Differences were showed on graphs in the schedule of the longitudinal velocity oils after the height of the gap in the flow of the micropolar and Newtonian liquid. In presented flow, the influence of lubricating fluid inertia force and the external elementary body force field were omitted. Presented calculations are limited to isothermal models of bearing with infinite breadth.
Źródło:
Journal of KONES; 2010, 17, 2; 249-256
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of velocity sensing in harvesters for magnetorheological dampers
Autorzy:
Sapiński, B.
Matras, A.
Powiązania:
https://bibliotekanauki.pl/articles/386498.pdf
Data publikacji:
2018
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
harvester
electromotive force
velocity
sensor
Opis:
This paper investigates the performance of electromagnetic vibration harvesters that can be incorporated in energy harvesting magnetorheological (MR) dampers. The study outlines the structure and operating principles of harvesters and compares results of numerical calculations with measurement data obtained under idle run. Results demonstrate the potential applications of harvesters as velocity sensors. The relationship between electromotive force (emf) and velocity across the devices is established. The discussion section suggests that power generation by harvesters can provide the velocity information by utilising the sensing function applicable to a variety of control algorithms.
Źródło:
Acta Mechanica et Automatica; 2018, 12, 3; 186-189
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of Equivalence of Small and Large Orifice Computational Models
Autorzy:
Kubrak, M.
Powiązania:
https://bibliotekanauki.pl/articles/241432.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
orifice
velocity
flow
computational models
Opis:
The aim of this paper was to analyze theoretical aspects of calculating steady water flow through unsubmerged circular orifices. Theoretical analysis shows that the values of discharge obtained by using formulas intended for small orifices are greater than those calculated using formulas for large orifices. These differences attain a maximum value when the water level reaches the upper edge of the orifice, and decrease when water head increases. It has been proven that the volumetric flow rate for circular unsubmerged orifices can be calculated by formulas for small orifices when the water level above the center of gravity is at least four times as high as the diameter of the orifice.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2015, 62, 3-4; 67-76
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical modelling of water-based Fe3O4 nanofluid due to rotating disc and comparison with similarity solution
Autorzy:
Bhandari, Anupam
Powiązania:
https://bibliotekanauki.pl/articles/2037806.pdf
Data publikacji:
2021
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
nanofluid
velocity
CFD Module
dimensionless analysis
Opis:
The current research demonstrates the revolving flow of water-based Fe3O4 nanofluid due to the uniform rotation of the disc. This flow of nanofluid is investigated using CFD Module in COMSOL Multiphysics. However, the similarity solution for this flow is also ob-tained after transforming the given equation into a non-dimensional form. In the CFD Module, streamlines and surface plots are compared with the similarity solution for the magnitude of the velocity, radial velocity, tangential velocity, and axial velocity. The results from the direct simulation in the CFD Module and the solution of dimensionless equations represent a similar solution of velocity distribution. The derived results show that increasing the volume concentration of nanoparticles and effective magnetic parameters decrease the velocity distribu-tion in the flow. Results in the CFD Module are important for monitoring the real-time particle tracing in the flow and, on the other hand, the dimensionless solution is also significant for the physical interpretation of the problem. Both methods of solution empower each other and present the physical model without sacrificing the relevant physical phenomena.
Źródło:
Acta Mechanica et Automatica; 2021, 15, 3; 113--121
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laboratory testing of velocity sensing in a magnetorheological damper with power generation
Autorzy:
Sapiński, B.
Powiązania:
https://bibliotekanauki.pl/articles/387253.pdf
Data publikacji:
2017
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
MR damper
power generator
voltage
velocity
sensing
Opis:
The study summarises the results of experimental examination of velocity sensing capability in a prototype of a magnetorheological damper with power generation (MRD). The device has two main components: an electromagnetic power generator and an MR damper. The study outlines the structure of the device with the main focus on the generator part, and provides results of tests performed under the idle run. The discussion of demonstrates the potentials of MRD action as a velocity-sign sensor and presents key issues which need to be addressed to enable its real life applications.
Źródło:
Acta Mechanica et Automatica; 2017, 11, 3; 186-189
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical homogeneous continuous dynamical systems holor algebra - steady-state alternating velocity analysis
Autorzy:
Fijałkowski, B.
Powiązania:
https://bibliotekanauki.pl/articles/265871.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
siła
prędkość
moc
force
velocity
power
holor
Opis:
In this article, a new mathematical representation of the sinusoidal alternating velocity, force and power by means of some complex quantities, termed ‘holors’ is proposed. The word holor is a term to describe a mathematical entity that is made up of one or more independent quantities, and includes complex numbers, scalars, vectors, matrices, tensors and other hypernumbers. Holors, thus defined, have been known for centuries but each has been developed more or less independently, accompanied by separate nomenclature and theory.
Źródło:
International Journal of Applied Mechanics and Engineering; 2016, 21, 4; 805-826
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Flow characteristics after installation of floating bridge in open channel
Autorzy:
Ibrahim, Mohamed M.
Eltoukhy, Mahmoud A.R.
Ghanim, Adnan D.
Powiązania:
https://bibliotekanauki.pl/articles/1844336.pdf
Data publikacji:
2021
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
floating bridges
flow characteristics
flume
head loss
velocity
Opis:
A pontoon bridge, also known as a floating bridge, can be used as for pedestrian and vehicle traffic. The buoyancy of the floating bridge limits the maximum load it can carry. This research included experimental runs to study variations of open channel flow characteristics upstream and downstream a floating bridge. Eighty one runs have been carried out using a flume in a hydraulic laboratory. The experimental run program is classified into two main categories; the first investigates the velocity ratios (vds/vus) downstream and upstream the floating bridge. The second category is concerned with the energy head losses (hL) due to the presence of a floating bridge. The experimental runs are carried out using three pontoon lengths, three flow depths, six submerged depths, and three discharges. The results are analysed and graphically presented to help predict hydraulic parameters. The outcomes have shown that the floating bridge upstream, Froude number and submergence of the pontoon are the dominant parameters that affect the studied flow characteristics.
Źródło:
Journal of Water and Land Development; 2021, 49; 244-251
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Guided wave propagation in thermal media through the semi analytical finite element method
Autorzy:
Bouchoucha, F.
Chaabane, S.
Ichchou, M. N.
Haddar, M.
Powiązania:
https://bibliotekanauki.pl/articles/281275.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
semi analytical finite element
thermal media
dispersion
velocity
Opis:
In this paper, the issue of the estimation of wave propagation characteristics in thermal media is dealt with. A formulation, named the Thermal Semi Analytical Finite Element, based on the semi analytical finite element approach coupled with the thermal effect is offered. Temperature variations affect the mechanical properties of the waveguide. The question of dispersion curves and group velocities is studied. This study is expected to be of use in the sensitivity analysis of guided waves for wave propagation in thermal environment. Comparisons between numerical and analytical results are given to show the effectiveness of the proposed approach.
Źródło:
Journal of Theoretical and Applied Mechanics; 2016, 54, 1; 285-293
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of sprint block start elements on initial velocity of 100 metre race
Autorzy:
Terczyński, Robert
Powiązania:
https://bibliotekanauki.pl/articles/1054601.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
laser
reaction time
speed measurement
sprint start
velocity
Opis:
The aim of this paper was to investigate whether it is possible to evaluate the relationship between different phases of sprint start objectively. The participants of the research were the top level of elite National Sprint Team (8 female, 9 male). The run times were as follows: 10.39 ±0.12 s for men and 11.63 ±0.20 s for women. The data that were taken into account during the research in order to examine typical kinetic parameters of the sprint start were: reaction time, delay between simple reaction time and reaction time (IAAF), time to front peak force, time to rear peak force, delay between end of front force and gun signal and total start time. The analysis of the study identifies the major kinematic parameters of the phases of the sprint start and block acceleration that influence the results of sprint running. The following correlation analyses were conducted, a linear regression for the typical kinetic parameters of the sprint start, initial speed on 100 metre race. Finally, a simple coaching related model for the development of sprinting is presented which is consistent with scientific evidence recommendations for coaches to make changes in training.
Źródło:
Central European Journal of Sport Sciences and Medicine; 2014, 8, 4; 87-96
2300-9705
2353-2807
Pojawia się w:
Central European Journal of Sport Sciences and Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of multiple velocity and temperature probe sets for ventilated spaces
Autorzy:
Alimardani, R.
Hoff, S.J.
Powiązania:
https://bibliotekanauki.pl/articles/24933.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
temperature measurement
temperature
ventilation
probe
development
thermistor
velocity
Źródło:
International Agrophysics; 2005, 19, 1
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Major Features Of Adaptive Supply Chains – Literature Review
Autorzy:
Leończuk, Dorota
Powiązania:
https://bibliotekanauki.pl/articles/504650.pdf
Data publikacji:
2020
Wydawca:
Międzynarodowa Wyższa Szkoła Logistyki i Transportu
Tematy:
adaptability
supply chain management
3V
visibility
velocity
versatility
Opis:
Adaptiveness is one of the most significant features of the supply chain that affects the results of its functioning. The capability of the supply chain to adapt to all, more and more demanding conditions is one of the main factors that guarantee long-term competitiveness and success. R. Kalakota, M. Robinson and P. Gundepudi consider inventory visibility, fulfilment velocity and coordination versatility as three fundamental pillars of adaptive supply chains, also termed as 3V in the literature. The chief objective of this paper is the identification of features that a supply chain should have in order to be called adaptive, as well as the verification of their compliance with the 3V principle. The review of the available literature sources that focus on the subject of the major features of adaptive supply chains (in particular having a decisive effect on their adaptive capabilities) has resulted in certain common elements. The authors of all the described approaches emphasise the two features: visibility and velocity. The third, frequently indicated, feature is also versatility or variety (that can be treated as one of the elements of the versatility of the supply chain). Visibility involves ensuring access to the information for all participants in the supply chain, also customers. Velocity, in turn, refers to the reaction time of the supply chain to all sorts of events and the time of implementing necessary changes. The third element is versatility. It primarily involves balancing the operational capability of a supply chain with market requirements, in particular delivering suitable products and services of the required quality and in the ordered volume. It is also vital to adjust the offer to the individual needs of customers.
Źródło:
Logistics and Transport; 2020, 45-46, 1-2; 43-54
1734-2015
Pojawia się w:
Logistics and Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydraulic parameters and morphometric variables interactions in bedrock channel
Autorzy:
Biswas, Biswajit
Chandra Das, Balai
Powiązania:
https://bibliotekanauki.pl/articles/1052833.pdf
Data publikacji:
2016-09-15
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
width/depth ratio
channel slope
hydraulic radius
velocity
stream power
Opis:
Present study is on the interdependent nature of hydraulic parameters and morphometric variables of a bedrock river. In this study, using dumpy level, GPS, satellite images and some mathematical equations a data set on hydraulics and morphometric variables of a bedrock channel, named Bhatajhor, of eastern India was generated. That data set was used to (1) find out impulse-response relations between hydraulic variables (2) find out relations between morphometric variables and (3) find out relations between hydraulic and morphometric variables. Seven equations (5–11) were formulated based on this empirical study to the end. The seven empirical relations, most of which include only two variables, involve channel cross-section dimensions (area, width, mean depth, maximum depth, width/depth ratio, hydraulic radius), slope and hydraulic variables (velocity, kinetic energy, stream power, Manning’s n factor, Chezy’s C factor and shear stress). Observation shows relatively higher coefficient of determination (R2) between variables like velocity and Manning’s n factor (0.67), velocity and Chezy’s C factor (0.67), slope and τ (0.89), w/d ratio and hydraulic radius (0.53), slope and w/d ratio (0.50).
Źródło:
Quaestiones Geographicae; 2016, 35, 3; 75-88
0137-477X
2081-6383
Pojawia się w:
Quaestiones Geographicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Regulacja programowa prędkości powietrza w czasie fluidalnego powlekania form farmaceutycznych
Programming control of air flow rate during the fluidal coating of pharmaceutical forms
Autorzy:
Czajkowska, M.
Sznitowska, B.
Kawalec-Pietrenko, M.
Powiązania:
https://bibliotekanauki.pl/articles/2073115.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
rdzeń
fluidyzacja
czas
prędkość
powłoka
core
fluidization
time
velocity
coating
Opis:
Analizowano problem zmian prędkości początku fluidyzacji powietrzem złóż peletek i minitabletek podczas ich powlekania. Wykazano wzrost prędkości początku fluidyzacji w czasie powlekania, przy czym efekt ten jest wypadkową spadku średniej gęstości cząstek oraz wzrostu ich rozmiarów. Stwierdzono równomierny rozkład grubości powłoki na powierzchni peletek, natomiast silnie zróżnicowany na powierzchni minitabletek. Największą grubość powłoki obserwowano na powierzchni cylindrycznej części minitabletek, a najmniejsze w obszarze krawędzi łączących część cylindryczną z czaszami kulistymi minitabletki.
The minimum fluidization velocity of pellets and minitablets beds during their coating was analyzed. An increase of minimum fluidization velocity during the coating process was found. The observed effect results from the decrease of mean particle density and the simultaneous increase of particle sizes. A uniform distribution of coating thickness on the pellets surfaces was noticed. Opposite to this, a distinctly various coating thickness on the minitablets surface was detected. The largest coating thickness was found on the cylindrical part of minitablets. The smallest thickness was found in the area of edges between the cylindrical part and spherical bowl parts of minitablets.
Źródło:
Inżynieria i Aparatura Chemiczna; 2015, 6; 312--313
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relationships between walking velocity and distance and the symmetry of temporospatial parameters in chronic post-stroke subjects
Autorzy:
Guzik, A.
Drużbicki, M.
Przysada, G.
Kwolek, A.
Brzozowska-Magoń, A.
Sobolewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/306249.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
udar
symetria
analiza lokomocji
prędkość
stroke
symmetry
gait analysis
velocity
Opis:
Purpose: Subjects with post-stroke hemiparesis frequently present with asymmetric gait patterns. Symmetry, reflecting similarities in temporospatial, kinematic parameters, is an important measure of gait assessment. The study was designed to examine the relationships between asymmetry of temporal, spatial and kinematic gait parameters and walking velocity and distance. Methods: Temporospatial and kinematic gait parameters were examined in a group of 50 chronic post-stroke subjects and in a group of 25 healthy controls. Symmetry ratio was calculated for all the parameters. Gait velocity was measured during 10-metre test, the walking distance during 2-Minute Walk Test, and balance during Up&Go Test. Results: The relationship between stance phase duration symmetry and gait speed was at a moderate level (r = –0.43, p = 0.0173). There was a moderate relationship between swing phase symmetry and walking velocity and distance. The findings did not show a significant correlation between step length symmetry versus gait speed and distance. Conclusions: There is a mild relationship between self-selected gait velocity and walking distance versus temporal parameters symmetry. The findings do not confirm a relationship between self-selected gait velocity and walking distance versus spatial and kinematic parameters as well as balance. Likewise, no evidence confirms that asymmetry of temporal, spatial, kinematic gait parameters changes with the age of post-stroke subjects or is related to the length of time from stroke onset. Given the above, gait symmetry may be recognized as an important indicator of the level of gait control in post-stroke patients because it enables unique gait assessment, independent from other parameters.
Źródło:
Acta of Bioengineering and Biomechanics; 2017, 19, 3; 147-154
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 54

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