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    Wyświetlanie 1-29 z 29
    Tytuł:
    Container Transport in Poland in Logistic Supply Chain
    Autorzy:
    Romanow, P.
    Frąś, J.
    Koliński, A
    Powiązania:
    https://bibliotekanauki.pl/articles/409087.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    intermodal solutions
    containerization
    transport dynamics
    transport statistics
    trans-shipping terminals
    supply chains
    Opis:
    This paper discusses key issues concerning the dynamics of container transport development with the use of intermodal solutions against phenomena taking place in transportation systems. It also shows limitations and typical situations which determine the procedure of transport subjects within the confines of realized container transport in logistic supply chains service.
    Źródło:
    Research in Logistics & Production; 2015, 5, 1; 43-51
    2083-4942
    2083-4950
    Pojawia się w:
    Research in Logistics & Production
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The use of modelling of impacts exerted by means of transport on the environment for ensuring safety
    Autorzy:
    Bril, J.
    Rydygier, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/30147093.pdf
    Data publikacji:
    2018
    Wydawca:
    Akademia Wojsk Lądowych imienia generała Tadeusza Kościuszki
    Tematy:
    means of transport
    dynamics of transport systems
    elastic foundation
    Opis:
    The article presents the model research on impacts exerted by means of transport on the structures. In modelling the dynamics of transport systems the dynamic properties of the ground forming the foundation soil for tracks or roadways have been taken into account. The ground has been modelled as an elastic half-space. The dynamics of an infinite mass band being in contact with an elastic half-space has been investigated. As part of the research on impacts exerted by means of transport on structures a model of a problem has been examined where an automotive vehicle, representing a concentrated force in motion, is in contact with a roadway described as a rigid body coupled with an elastic half-space. It has been demonstrated that a surface (Rayleigh) wave propagates in the ground, being a continuous (elastic) medium, and acts on a structure modelled as a rigid body. The research results have been presented in the form of vertical and horizontal transmittances of the ground for different frequencies of loading with different unit forces.
    Źródło:
    Scientific Journal of the Military University of Land Forces; 2018, 50, 2(188); 162-175
    2544-7122
    2545-0719
    Pojawia się w:
    Scientific Journal of the Military University of Land Forces
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transperitoneal transport dynamics of methotrexate in vitro: tissue and diffusion barriers
    Autorzy:
    Czyzewska, K
    Powiązania:
    https://bibliotekanauki.pl/articles/69773.pdf
    Data publikacji:
    1995
    Wydawca:
    Polskie Towarzystwo Fizjologiczne
    Tematy:
    transport dynamics
    diffusion barrier
    anticancer drug
    transport asymmetry
    in vitro
    methotrexate
    intraperitoneal pharmacotherapy
    mesothelial barrier
    peritoneal membrane
    intraperitoneal chemotherapy
    ovarian cancer
    rabbit
    tissue
    Źródło:
    Journal of Physiology and Pharmacology; 1995, 46, 2
    0867-5910
    Pojawia się w:
    Journal of Physiology and Pharmacology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Growth rate and cyclical fluctuations in transport. A simple model
    Autorzy:
    Dorosiewicz, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/409238.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    transport
    dynamics
    cyclical fluctuations
    Opis:
    The paper contains a preliminary study of the transport market dynamics model, including its cyclical fluctuations. An additional goal is to enable a quantitative examination of the impact of transport congestion on the economic development and the effects of underinvestment in transport.
    Źródło:
    Research in Logistics & Production; 2018, 8, 4; 339-349
    2083-4942
    2083-4950
    Pojawia się w:
    Research in Logistics & Production
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assigment of maximal acceleration of a car as a function of some independent variables
    Autorzy:
    Drąg, Ł.
    Adamski, W.
    Brzozowska, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/242214.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    transport
    modelling
    vehicle dynamics
    traffic flow
    Opis:
    The procedure for calculation of a car maximal acceleration during speeding up with changing shifts of a gearbox in dependence on several independent parameters has been presented in the paper.  The parameters taken into consideration are the angle of a road slope and the additional vehicle load. The maximal acceleration for investigated vehicle category has been calculdted on the basis of many numerical simulations. During these simulations the dynamics of vehicle motion has been modelled for different road conditions. In order to approximate the results of acceleration the power polynomials were applied.  The least sąuare method has been used in calculations of polynomial coefficients. The results of modelling of the vehicles dynamics concern two passenger cars and one heavy duty car. Simulations of speeding up were obtained using the model of vehicle dynamics. Especially, model of vehicle, the traction characteristic of the passenger car with SI engine, the maximal driving force on  wheels during vehicle acceleration calculated on the basis of traction characteristic,   the maximal acceleration of the passenger cars and according to the model of vehicle dynamics during speeding up with changing shifts of a gearbox in dependence on different parameters of road slope and vehicle load are presented in the paper.
    Źródło:
    Journal of KONES; 2009, 16, 3; 85-92
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of mass changes of flying objects on their dynamic features
    Autorzy:
    Wiśniewski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/246227.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    transport
    air transport
    dynamics features
    resonance researches
    mass loss
    Opis:
    The aim of this work is the experimental study of the weight loss impact on the properties of flying objects. Work is hased on the results of resonance tests of the helicopter, gliders and military aircraft. In the presented flying objeets group the possible occurrence of weight losses during the flight are up to 50%. The paper posed the following questions: How big can be, in practice, the weight loss during the flight? To which resonance the mass loss has the greatest impact? How and by what rules the map of resonances changes? Does in the process of weight loss there are other, worth-knowing events? Gliders, airplanes and a helicopter were investigated in the Resonance Test Laboratory of Institute of Aviation. The author has organized and for over 20 years led the Resonance Test Laboratory at the Institute of Aviation, in which he made or directed the investigations of dozens of aircraft, gliders, helicopters and their elements and components. Effect of weight loss on the flying objeets properties is one of several ,,unusual" research topics phenomena, which the author observed during a standard resonance tests. The resonance of the mode shape of Jantar 15 glider, comparison of the relative increase in the frequencies of the resonances with mode shape for SZD-50 Jantar 15-2 and IS-2 Revelation gliders, results of investigations of the underwing stores loss of mass impact on the „Pattem" aircraft resonances freąuencies, the resonance frequency of the 1-22 Iryda aircraft are presented in the paper. The resonance of the mode shape of Jantar 15 glider, comparison of the relative increase in the frequencies of the resonances with mode shape for SZD-50 Jantar 15-2 and IS-2 Revelation gliders, results of investigations of the underwing stores loss of mass impact on the ,,Pattern" aircraft resonances frequencies, the resonance frequency of the 1-22 Iryda aircraft are presented in the paper.
    Źródło:
    Journal of KONES; 2010, 17, 4; 591-598
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An assessment of trailer suspension dynamic behavior via vibration measurements
    Autorzy:
    Hunicz, J.
    Koszałka, G.
    Golec, M.
    Taratuta, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/241829.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    road transport
    exceptional transport
    semi-trailer
    vibration measurements
    suspension dynamics
    Opis:
    A dynamic response of a semi-trailer suspension to a real road profile under two different loads was investigated in this study. The trailer was a low loader for transporting heavy and large loads which configuration could be adjusted to the current needs. During the described investigation the vehicle was composed of: detachable gooseneck, maximally extended low bed and 5 hydraulically steered axles comprised 2-axle and 3-axle assemblies. The experiments were performed for unloaded and loaded with 60 tons trailer, that was equal to maximum trailer pay load. Acceleration measurements at unsprung and sprung parts of the vehicle were applied. As a test surface a railway track crossing was chosen. Acceleration time series were analysed by the means of power spectral density. The isolation of free vibration and forced vibration frequencies and effectiveness of suspension damping over wide frequency range was done. Two characteristic signal bands were identified. In the frequency range up to 10 Hz vehicle vibration energy decreased for the load increase for both, sprung and unsprung parts. In contrast, in the range between 10 and 25 Hz at higher load increase of vibration energy was noticed, however only at unsprung mass. Data analysis revealed complexity of vehicle vertical acceleration as a response to the road profile. Nevertheless, it allowed for estimation of the trailer dynamic loads under real road conditions.
    Źródło:
    Journal of KONES; 2012, 19, 4; 333-338
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High speed rail - the current challenge to Polish rail transport
    Autorzy:
    Karaś, S.
    Krasnowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/246544.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    rail transport
    high-speed rail
    bridges
    HSR
    dynamics
    Opis:
    The increase of the role of rail transport in comparison with road and air ones was an important task for transport engineering in western Europe and Japan in the 1970s. Now the problem is not completely closed but the majority of the establishments formed in the beginning were successively solved. The main assumptions could be grouped into environmental protection and sustainability, decreasing the travel time connected with accessibility, safety, comfort for passengers, considering freight transport, as well. The high speed of the moving train was the main criteria of any engineer approach i.e. from the point of view of energy safety, limiting pollution, ability to transport thousands of people and tons of cargo. High Speed Rail - (HSR) means the speed between 250 to 400 km/h. This divides tracks into two groups: ordinary tracks and special ones, which results in two possible ways: adopting existing tracks or building new railways. Recently the program of HSR has been decided to put in motion in Poland. The situation here was very complicated. Many abandons such as complete lack of road highways, backwardness in air transport as well as rail transport, which means abandons in track conditions and rolling stock. At least, actually no existing haulage transport. In those circumstances, any rational first step was to be taken i.e. a technical diagnosis and an estimation of the existing railway system including culverts and bridges as important elements of trucks. The paper presented here contains a short survey of statical and dynamical field test results and FEM analyses as an extension to the train speeds 1.2ź350 = 420 km/h.
    Źródło:
    Journal of KONES; 2012, 19, 3; 203-212
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of flight dynamics of an airplane encountering trailing vortices generated by another airplane
    Autorzy:
    Czechowicz, B.
    Kowaleczko, G.
    Nowakowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/248149.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    air transport
    airplane
    airplane flight dynamics
    trailing vortices
    Opis:
    This paper presents method of flight dynamics modelling for aircraft encountering trailing vortices generated by other airplane. The mathematical model of 6-DOF spatial motion was applied. Aerodynamic forces produced by a wing were calculated using strip theory method – the wing was divided into a series of chordwise strips and contribution of each strip in these forces was determined. Local angle of attack for each strip was determined taking into account an influence of trailing vortices. Exemplary results of simulations for the case of two straight vortices encountered by aircraft are shown. Incremental contributions to aerodynamic forces and moments of all strips are summed. Model and description of trailing vortices, induced velocity inside the vortex, induced velocity outside the vortex, model of motion dynamics, equations of motion, airplane forces, moments acting on the airplane, aerodynamic forces and moments, trailing vortex effect on the airplane are presented in the paper. In particular, pair of straight trailing vortices, induced velocity for Rankine vortex, strip model of the wing, angle of attack for the strip, airplane pitch angle, bank angle, altitude, trajectory are illustrated.
    Źródło:
    Journal of KONES; 2012, 19, 1; 41-50
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic stability criterion for the evaluation of a steel industrial hall with internal transport
    Dynamiczne kryterium oceny stateczności stalowej hali przemysłowej z transportem wewnętrznym
    Autorzy:
    Pawlak, U.
    Szczecina, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/104205.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
    Tematy:
    steel hall
    internal transport
    stability
    dynamics
    hala stalowa
    transport wewnętrzny
    stateczność
    dynamika
    Opis:
    The paper presents the problem of dynamic criterion of stability loss of industrial hall with internal transport. The analysis was performed with finite element method. As a result of the calculation the relationship of eigenfrequency and axial compressive force was presented. On the basis of these results fundamental recommendations formulated for designers of steel halls with internal transport.
    W referacie przedstawiono zagadnienie dynamicznej utraty stateczności hali stalowej z transportem wewnętrznym. Analizę przeprowadzono metodą elementów skończonych. Jako wynik obliczeń przedstawiono zależność częstości drgań własnych konstrukcji od siły ściskającej w słupach konstrukcji. Na podstawie wyników analizy sformułowano podstawowe zalecenia dla projektantów konstrukcji hal stalowych z transportem wewnętrznym.
    Źródło:
    Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2017, 64, 2/I; 87-96
    2300-5130
    2300-8903
    Pojawia się w:
    Czasopismo Inżynierii Lądowej, Środowiska i Architektury
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On Flow-Altering Countermeasures for Scour at Vertical-Wall Abutment
    Autorzy:
    Radice, A.
    Lauva, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/241252.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    local scour
    abutment
    process dynamics
    flow-altering countermeasures
    sediment transport
    Opis:
    Results are presented for clear-water scour experiments at a vertical-wall abutment where the obstacle was modified with slots or roughening elements as flow-altering countermeasures against the erosion process. The laboratory campaign comprehended an initial experiment with an unprotected obstacle, two experiments with slots above and beneath the non-scoured bed level, respectively, and one experiment with a roughened abutment. The repeatability of the experiments was checked and found satisfactory. The measured data set consisted of (i) scour depth with time; (ii) geometry of the erosion hole; and (iii) sediment motion pattern at several evolution stages of the process. A novel feature of the work was the attempt to combine evidence on the scour depth and that on sediment motion so as to shed light on the mechanism of scour reduction by the countermeasures tested. It is argued that this strategy might furnish guidelines for future extensive investigations of scour countermeasures, aimed at finding optimal design solutions.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2012, 59, 3-4; 137-153
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Storage of hydrogenous gas in geological formations: self-organisation methane gas
    Autorzy:
    Toleukhanov, A.
    Kaltayev, A.
    Panfilov, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/298661.pdf
    Data publikacji:
    2013
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    porous media
    hydrogen
    reactive transport
    bacteria
    neuston
    chemotaxis
    population dynamics
    oscillations
    Opis:
    In the case of producing large amounts of hydrogenous gas, currently there are no problems related to basic techniques of hydrogen production and distribution, but the main technological problem will consists of storing it in order to regulate the difference between permanent or increasing gas production and seasonally modulated gas consumption. The most efficient and most inexpensive method of storing large amounts of hydrogen is to inject them in geological formations like aquifers, depleted gas reservoirs, or salt caverns (Zittel and Wurster 1996). The cost is of order $ 3.5 per 1 GJ (Taylor et al. 1986). Several underground storages of hydrogen (USH) or town gas exist in the word, as for instance, Teeside in the UK, in Texas, in Russia, Kiel in Germany, Lobodice in Czechoslovakia, Beynes - an ex-storage in France. During several tens of years the storage of hydrogen was considered as something deja-vu, to be similar to that of natural gas, which is amplified by the chemical inactivity of hydrogen and its very low solvability in groundwater [Bulatov 1979; Carden and Paterson 1979; Lindblom 1985; Paterson 1983]. Nevertheless, quite unusual behaviour of UHS was discovered by in situ monitoring of the gas composition extracted during the cycle "production" which followed the cycle "injection". These observations (Smigai et al. 1990; Buzek et al. 1994) revealed high variations of gas composition in time and space. In particular, a significant reduction in the H2 and CO2 contents and a simultaneous increase in CH4 contents were observed in the Lobodice town gas storage facility (Smigai et al. 1990). Similar phenomena were recorded in Beynes. After several months of injection and storage, at the beginning of the cycle "production" the twofold increase of the methane contents in the reservoir gas and the twofold reduction of the CO2 CO contents was observed. The contents of hydrogen decreased by 1.4. The explanation to these observations has been done in (Buzek et al. 1994) in terms of the in situ methane generators by methanogenic bacteria which catalyse the reaction between hydrogen and CO2/CO, by producing methane and water. Further observations have revealed even more unusual effects within the storage facility, such as creating a spatial alternation of the areas saturated preferably by hydrogen or methane. This proved an in situ natural separation of chemical components in space. Thus, we are dealing with a natural reactor which partially destroys CO2 and H2 and doubles the mass of methane. It is clear that the problem is important for industry as it concerns both the energy sector and ecology. The resulting economical efficiency of such a process can be estimated only after the physical and mathematical modeling of all possible scenarios of the reservoir behaviour. The development of such a model represents the main objective of this paper.
    Źródło:
    AGH Drilling, Oil, Gas; 2013, 30, 1; 241-245
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Virtual ship’s roll decay test with the use of CFD technique
    Autorzy:
    Krata, P.
    Jachowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/243570.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    sea transport
    ship stability
    roll simulation
    roll decay test
    computational fluid dynamics
    Opis:
    Since safety of navigation is related to the stability performance of a ship, the transverse stability is routinely calculated and measured. One of the crucial experimental approach is a roll decay test. Although, an obtained result of the roll decay test carried out on the full-scale ship needs to be compared to a benchmark enabling an estimation of the relevant stability. Nowadays such a benchmark is just based on the simplified GM-based IMO-recommended formula. This research aims at the more sophisticated method of ship’s natural period of roll estimation and thus her stability assessment. The CFD (computational fluid dynamics) technique is applied and the result of the free roll simulation is compared to the solution of a roll equation. The one degree-of-freedom roll equation is applied with regard to the nonlinear ship righting moment and the nonlinear damping moment obtained according to Ikeda’s method. The six degrees-of-freedom simulation of ship’s roll decay test was carried out by the use of FlowVision code utilizing the Reynolds-averaged Navier–Stokes equation with regard to the turbulent flows based on the eddy viscosity concept. The semi-empirical k-ε turbulence model was applied. Thereby, the CFD-based approach allows to get rid of any assumptions regarding the value of the damping coefficient, which is an advantage over the roll equation based approach.
    Źródło:
    Journal of KONES; 2016, 23, 2; 215-221
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ion Move Brownian Dynamics (IMBD) : Simulations of Ion Transport
    Autorzy:
    Kurczyńska, M.
    Kotulska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/307444.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    dynamika
    transport jonów
    potas
    model jakości
    alpha-hemolysin
    Brownian dynamics
    ion transport
    potassium channel
    model quality assessment
    Opis:
    Purpose: Comparison of the computed characteristics and physiological measurement of ion transport through transmembrane proteins could be a useful method to assess the quality of protein structures. Simulations of ion transport should be detailed but also time-efficient. Methods: The most accurate method could be Molecular Dynamics (MD), which is very time-consuming, hence is not used for this purpose. The model which includes ion-ion interactions and reduces the simulation time by excluding water, protein and lipid molecules is Brownian Dynamics (BD). In this paper a new computer program for BD simulation of the ion transport is presented. We evaluate two methods for calculating the pore accessibility (round and irregular shape) and two representations of ion sizes (van der Waals diameter and one voxel). Results: Ion Move Brownian Dynamics (IMBD) was tested with two nanopores: alpha-hemolysin and potassium channel KcsA. In both cases during the simulation an ion passed through the pore in less than 32 ns. Although two types of ions were in solution (potassium and chloride), only ions which agreed with the selectivity properties of the channels passed through the pores. Conclusions: IMBD is a new tool for the ion transport modelling, which can be used in the simulations of wide and narrow pores.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2014, 16, 4; 107-115
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Przykład zastosowania programu Enterprise Dynamics do rozwiązywania wybranych problemów komunikacji publicznej
    Example of the application of the Enterprise Dynamics software for solving the selected public communication problems
    Autorzy:
    Dobrzańska, M.
    Dobrzański, P.
    Śmieszek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/310033.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Naukowo-Wydawniczy "SPATIUM"
    Tematy:
    transport miejski
    transport pasażerski
    infrastruktura transportowa miasta
    pętla autobusowa
    Enterprise Dynamics
    badania symulacyjne
    efektywność transportu
    city transport
    passenger transport
    city transport infrastructure
    bus terminus
    simulation tests
    transport efficiency
    Opis:
    Prawidłowo funkcjonujące i rozwijające się miasto wymaga sprawnego transportu. W ruchu miejskim dominujący jest transport pasażerski, na który składa się transport publiczny i indywidualny. Transport publiczny powinien być jednak konkurencyjny w stosunku do indywidualnych środków transportu. Jednym z elementów zapewniających sprawne funkcjonowanie transportu publicznego jest jego infrastruktura. W artykule przedstawiono analizę funkcjonowania wybranego fragmentu infrastruktury transportu zbiorowego. Istnieje wiele programów służących do symulacji procesów transportowych. Ze względu na istotne podobieństwo zachodzących procesów w pętli autobusowej i transporcie wewnętrznym postanowiono wykorzystać do rozwiązania problemu program Enterprise Dynamics. W tym celu opracowano przy wykorzystaniu programu Enterprise Dynamics model analizowanego obiektu i na podstawie przeprowadzonych badań symulacyjnych przeprowadzono szereg analiz dotyczących jego funkcjonowania.
    A properly functioning and developing city requires efficient transportation. Urban transport is dominated by passenger transport, which consists of public and private transport. However, public transport should be competitive with individual means of transport. One of the elements ensuring smooth functioning of public transport is its infrastructure. The article analyzes the functioning of the chosen part of the public transport infrastructure. For this purpose, Enterprise Dynamics software was used to develop the model of the analyzed object. A number of analyzes have been carried out on the basis of the simulations.
    Źródło:
    Autobusy : technika, eksploatacja, systemy transportowe; 2017, 18, 12; 1490-1493, CD
    1509-5878
    2450-7725
    Pojawia się w:
    Autobusy : technika, eksploatacja, systemy transportowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation into the Flow of Gas-Solids during Dry Dust Collectors Exploitation, as Applied in Domestic Energy Facilities – Numerical Analyses
    Autorzy:
    Maćkowiak, Albert
    Kostrzewski, Mariusz
    Bugała, Artur
    Chamier-Gliszczyński, Norbert
    Bugała, Dorota
    Jajczyk, Jarosław
    Woźniak, Waldemar
    Dombek, Grzegorz
    Nowak, Karol
    Powiązania:
    https://bibliotekanauki.pl/articles/28086943.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    the efficiency of dust extraction
    energy consumption
    multi-phase flow transport
    technological transport
    computational fluid dynamics
    dust collector
    Opis:
    The paper presents the results related to the simulation of dust-separating tangential cyclones: single cyclones of various geometries, and an axial multi-cyclone with fixed geometries and components. Its goal was to apply low-cost analyses for cyclones in industrial realization. Therefore, the presented research was applied with simulation methodology as a problem of Computational Fluid Dynamics. The models were analyzed using SolidWorks Flow Simulation software. The presented dust collectors are real-life objects, applied in industrial facilities. For a multi-cyclone, the increase in the number of blades, from 5 to 8, together with the change in the angle of a blade’s pitch i.e., 30° and 45°, resulted in dust concentration along the internal walls from just 10% for 5 blades up to c.a. 37.5% for 6 blades, and c.a. 50% for 8 blades, whereas the dust concentration in the device’s central part equals c.a. 20% for the last option. The model validation draws attention to the potential applicability of the software in flow issues alongside common and more complex numerical environments.
    Źródło:
    Eksploatacja i Niezawodność; 2023, 25, 4; art. no. 174095
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of GPS receiver to road tests of automobile
    Autorzy:
    Sar, H.
    Pokorski, J.
    Fundowicz, P.
    Reński, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/242475.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    automobile dynamics
    air drag coefficient
    rolling drag coefficient
    ECE 13 Regulation
    road transport
    Opis:
    The article presents the assessment of the possibilities of applying GPS receiver for the measurement and acquisition of the longitudinal velocity of automobile in the investigations of longitudinal dynamics of automobile. For many years for the measurement of the longitudinal velocity Correvit-L sensors are applied. Major simplification of the measurement of the velocity with the GPS receiver, compared with correlational-optical sensors Correvit-L is giving the possibility to faster prepare the automobile for examinations. The more so as only recently GPS receivers with 10 Hz sampling rate are available. In the paper is shortly described the software specially designed for the measurements that makes it possible to simultaneously measure both the longitudinal velocity signal from GPS receiver and from Correvit-L sensor in real time. Furthermore, the application of the measurement of the velocity is presented on the basis of such road tests as the attempt of accelerating through the following gears, the attempt of free deceleration and the attempt of braking according to ECE 13 Regulation. On the basis of the mentioned manoeuvers the characteristics of the vehicle’s acceleration and dynamic coefficient, rolling and air drag coefficient and the braking deceleration were determined. The paper shows also some problems connected with applying GPS receiver to measure longitudinal velocity of the automobile.
    Źródło:
    Journal of KONES; 2013, 20, 3; 359-366
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heat transfer and inverse problems; selected cases in 1D and 3D geometries
    Transport ciepła i zagadnienia odwrotne; wybrane przykłady w geometrii jedno- i trójwymiarowej
    Autorzy:
    Szyszkiewicz, K.
    Dziembaj, P.
    Filipek, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/350936.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    transport ciepła
    dynamika płynów
    zagadnienie odwrotne
    heat transfer
    compuational fluid dynamics
    inverse problems
    Opis:
    Heat transport phenomena in the framework of continuum media mechanics is presented. Equations for conservation laws and finite volume numerical method based on these equations are discussed. This method is the foundation of the FLUENT computational fluid dynamics (CFD) package which was used for calculations of the temperature distribution in several examples: steady and evolutional states for single and multiphase systems. Comparison with analytical solutions was carried out. This allows verification of the FLUENT results for various boundary conditions. Independent procedure based on the method of lines was applied for 1D cases and compared with FLUENT and/or analytical results. Formulation of a special type inverse problem for heat equation was given. Analytical solution of the steady-state inverse problem in 1D geometry was developed. Analogues case for 3D geometry was tested using FLUENT. This led to the optimization problem with clear and well defined optimum. This result suggests that in similar but more general inverse problems global optimum may exist which justifies the inverse problem methodology.
    Zaprezentowano zjawiska transportu ciepła w kontekście mechaniki ośrodków ciągłych. Omówiono równania wyrażające prawa zachowania oraz metodę numeryczną objętości skończonych bazującą na tych prawach. Metoda ta będaca podstawa pakietu FLUENT, który służy do obliczeń w dynamice płynów (CFD, compuational fluid dynamics) została użyta do symulacji rozkładu temperatury w kilku przykładach ilustrujących stany ewolucyjne i stacjonarne dla jedno- i wielo-fazowych układów. Przeprowadzono porównanie z wybranymi rozwiązaniami analitycznymi. Pozwoliło to na weryfikacje wyników z FLUENT-a dla różnych warunków brzegowych. Niezależna procedura oparta o metodę linii dla przypadku jednowymiarowego została wykorzystana do porównania z wynikami z FLUENT-a oraz wynikami analitycznymi. Sformułowano pewien specjalny przypadek zagadnienia odwrotnego dla równania ciepła i przedstawiono jego analityczne rozwiązanie. Analogiczny przypadek w geometrii trójwymiarowej przetestowano numerycznie z użyciem FLUENT-a. Prowadzi to do problemu optymalizacji z dobrze określonym minimum globalnym. Wynik ten sugeruje, że w podobnych, ale bardziej ogólnych zagadnieniach odwrotnych może istnieć optimum, co usprawiedliwia metodologie zagadnienia odwrotnego w takich sytuacjach.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 1; 9-18
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mathematical and simulation modelling of normal force for a rail
    Autorzy:
    Kisilowski, J.
    Kowalik, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/393938.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Stowarzyszenie Telematyki Transportu
    Tematy:
    rail vehicle dynamics
    normal force
    transport
    railways
    dynamika pojazdów szynowych
    siła normalna
    szyny kolejowe
    Opis:
    Description of dynamics occurring during the passage of a rail vehicle is a complex problem, and their mathematical relations are considered in several different aspects such as: interaction of normal force on a beam with fixed and variable cross-section, body, trolley and wheelset displacement and consideration of wheel-rail contact and other phenomena occurring in the contact surface, which include adhesion and creepage. The article presents the effects of work on the issues of normal force at the contact point of the wheel and rail. A mathematical model describing the dynamics of a rail vehicle was defined, determining the normal, transverse and longitudinal force appearing in the wheel-rail contact zone. Variations in the value of the normal force exerted by the wheelset on the rail are the quantity on which the parameters occurring in contact between the wheel and the rail depend. The obtained results from computer simulations show that the normal force is a variable parameter depending on the sign and magnitude of forces occurring between individual blocks of the rail vehicle during the movement. The results obtained will be used in further scientific work devoted to the contact problems.
    Źródło:
    Archives of Transport System Telematics; 2018, 11, 4; 29-36
    1899-8208
    Pojawia się w:
    Archives of Transport System Telematics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mathematical models of ion transport through cell membrane channels
    Autorzy:
    Miękisz, Jacek
    Gomułkiewicz, Jan
    Miękisz, Stanisław
    Powiązania:
    https://bibliotekanauki.pl/articles/748548.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Matematyczne
    Tematy:
    ion channels, ion transport, Poisson-Nernst-Planck equations, non-equilibrium statistical mechanics, Kawasaki dynamics, driven lattice gases
    Opis:
    We discuss various models of ion transport through cell membrane channels. Recent experimental data shows that sizes of some ion channels are compared to those of ions and that only few ions may be simultaneously in any single channel. Theoretical description of ion transport in such channels should therefore take into account stochastic fluctuations and interactions between ions and between ions and channel proteins. This is not satisfied by macroscopic continuum models based on the Poisson-Nernst-Planck equations. More realistic descriptions of ion transport are offered by microscopic molecular and Brownian dynamics. We present a derivation of the Poisson-Nernst-Planck equations. We also review some recent models such as single-file diffusion and Markov chains of interacting ions (boundary driven lattice gases).Such models take into account discrete and stochastic nature of ion transport and specifically interactions between ions in ion channels.
    Źródło:
    Mathematica Applicanda; 2014, 42, 1
    1730-2668
    2299-4009
    Pojawia się w:
    Mathematica Applicanda
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of rime icing and its effects on aerodynamic characteristics of an airfoil
    Autorzy:
    Sznajder, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/243475.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    computational fluid dynamics
    aerodynamics
    two-phase flow
    simulation of ice accretion
    heat exchange
    aircraft engineering
    transport
    vehicle
    Opis:
    A mathematical model for simulation of icing dedicated to simulation of ice accretion and its effects on aircraft aerodynamic characteristics in conditions of rime icing is presented. Pure rime icing occurs at lower temperatures than glaze icing and results in higher roughness of the surface of deposited ice. The model accounts for increased surface roughness, in terms of equivalent sand grain roughness, caused by deposited rime ice, which influences generation and dispersion of heat in the boundary layer. Increase of surface roughness is determined by analytical models created upon experimental data obtained in icing wind tunnels. Increased generation of heat is a result of increased tangential stress on the surface and is quantified in the temperature recovery factor determined numerically by a CFD solver. Effects of surface roughness on the intensity of forced convection are quantified by application of Colburn analogy between heat and momentum transfer in the boundary layer, which allows assessment of heat transfer coefficient for known friction coefficient, determined by CFD. The computational method includes determination of the surface distribution of mass of captured water in icing conditions. The model of freezing of captured water accounts for generation of heat due to latent heat of captured water droplets, temperature recovery in boundary layer and kinetic energy of captured droplets. The sinks of heat include forced convection, heating of super cooled droplets, conduction of heat through the ice layer and sublimation. The mathematical model is implemented as user-defined function module in ANSYS Fluent solver. The results include effects of deposited ice, including increased surface roughness on aerodynamic characteristics of an airfoil.
    Źródło:
    Journal of KONES; 2018, 25, 3; 437-443
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Depositional environment of sediments along the Southern coast of Tamil Nadu, India
    Autorzy:
    Angusamy, N.
    Rajamanickam, G.V.
    Powiązania:
    https://bibliotekanauki.pl/articles/48988.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    depositional environment
    Tamil Nadu coast
    beach sediment
    wave dynamics
    grain size
    sediment
    India fluvial input
    littoral transport
    Opis:
    Grain size studies of sediments from beaches in the region from Mandapam to Kanyakumari, divided into 5 sectors, indicate that sediments are unimodal to polymodal in nature, coarse to fine grained, moderately to poorly sorted, and positively-negatively skewed in character. The inference to be drawn from these studies is that the variation in sedimentological parameters is governed by fluvial input, wave dynamics, and littoral transport of the sediments. Bivariant plots show that the Mandapam and Kanyakumari sectors can be classified as beach environments, whereas the Tuticorin and Valinokkam sectors come under the influence of riverine environments and the dune environment in the Manappad sector. The CM pattern of all five sectors shows a clustered distribution of sediments in the PQ and QR segments, indicating a graded mode of deposition. Visher diagrams depict a wave shadow environment for the Mandapam sector, whereas the Valinokkam, Tuticorin and Manappad sectors show double saltation populations characteristic of beaches, and the Kanyakumari sector is characterized by a more truncated population characteristic of a plunge zone, which is a high-energy environment.
    Źródło:
    Oceanologia; 2006, 48, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelowanie gęstych zawiesin popiołów lotnych w rurociągu podsadzkowym
    Modelling of dense slurry of fly ashes in a backfill pipeline
    Autorzy:
    Janoszek, T.
    Lubosik, Z.
    Łączny, J. M.
    Prusek, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/166950.pdf
    Data publikacji:
    2014
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Górnictwa
    Tematy:
    numeryczna mechanika płynów
    hydrotransport
    mieszaniny wodno popiołowe
    podsadzka
    computational fluid dynamics (CFD)
    hydraulic transport
    ash-water mixtures
    backfill
    Opis:
    Przedmiotem opracowania jest zaprezentowanie możliwości zastosowania metod numerycznej mechaniki płynów do analizowania parametrów wydajnościowych związanych z procesem hydrotransportu w rurociągu mieszaniny popiołowo-wodnej do podsadzania wyrobisk. Celem pracy jest zidentyfikowanie wartości ciśnień roboczych panujących w poszczególnych odcinkach analizowanej instalacji podsadzkowej w warunkach hydrotransportu gęstej zawiesiny popiołów lotnych. Analizą objęto rzeczywiste parametry geometryczne rurociągu podsadzkowego w jednej z polskich kopalń węgla kamiennego.
    The purpose of this study is to demonstrate the applicability of the Computational Fluid Dynamics methods to analyze the performance parameters of the hydraulic transportation of ash-water mixture in the gravity transportation pipeline. The aim of the test is to identify the values of working pressures in the given sections of the pipeline under the conditions of hydraulic transportation of fly ash slurry. The analysis included the actual geometric parameters of the pipeline in one of the Polish coal mines.
    Źródło:
    Przegląd Górniczy; 2014, 70, 4; 90-98
    0033-216X
    Pojawia się w:
    Przegląd Górniczy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The eigenvalue problem in the dynamics of the steel industrial hall with internal handling system
    Zagadnienie własne w dynamice stalowej hali przemysłowej z transportem wewnętrznym
    Autorzy:
    Pawlak, U.
    Szczecina, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/402000.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
    Tematy:
    steel halls
    internal handling system
    eigenvalue problem
    dynamics
    eigenvalues
    hale stalowe
    transport wewnętrzny
    zagadnienie własne
    dynamika
    wartości własne
    Opis:
    The paper presents the eigenvalue problem in the dynamics of the steel industrial hall with an internal handling system. The aim of the calculations was to determine the eigenfrequencies and eigenvectors for the structure of the hall adapted to a gantry operation. The analysis was performed by using FEM software, namely Robot. Among over a dozen calculated eigenvectors, four ones were chosen as the most representative for a lateral structural arrangement of the hall and its roof.
    Źródło:
    Structure and Environment; 2016, 8, 4; 229-236
    2081-1500
    Pojawia się w:
    Structure and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fluid/solid coupled heat transfer analysis of a free rotating disc
    Autorzy:
    Bulat, P. V.
    Volkov, K. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/240377.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat transfer
    coupled analysis
    computational fluid dynamics
    finite element analysis
    disc
    rotating cavity
    transport ciepła
    sprzężona analiza
    CFD
    metoda elementów skończonych
    tarcza
    Opis:
    The coupled fluid/solid heat transfer computations are performed to predict the temperatures reached in the rotating disc systems. An efficient finite element analysis (FEA) and computational fluid dynamics (CFD) thermal coupling technique is developed and demonstrated. The thermal coupling is achieved by an iterative procedure between FEA and CFD calculations. In the coupling procedure, FEA simulation is treated as unsteady for a given transient cycle. To speed up the thermal coupling, steady CFD calculations are employed, considering that fluid flow time scales are much shorter than those for the solid heat conduction and therefore the influence of unsteadiness in fluid regions is negligible. To facilitate the thermal coupling, the procedure is designed to allow a set of CFD models to be defined at key time points/intervals in the transient cycle and to be invoked during the coupling process at specified time points. The computational procedure is applied to predict heat transfer characteristics of a free rotating disc.
    Źródło:
    Archives of Thermodynamics; 2018, 39, 3; 169-192
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geographic differences in passenger turnover decline at airports around the world in 2020 caused by the COVID-19 pandemic
    Zróżnicowanie geograficzne spadku ruchu pasażerskiego na lotniskach świata w 2020 r. spowodowane pandemią COVID-19
    Autorzy:
    Tarkhov, Sergey
    Powiązania:
    https://bibliotekanauki.pl/articles/2089583.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Gdański. Komisja Geografii Komunikacji Polskiego Towarzystwa Geograficznego
    Tematy:
    COVID-19 pandemic
    air transportation
    air passenger flow
    passenger turnover
    decline dynamics
    decline types
    epidemia COVID-19
    transport lotniczy
    lotnicze przewozy pasażerskie
    ruch pasażerów
    dynamika spadku
    rodzaje spadków
    Opis:
    Decline types of passenger turnover of 517 airports worldwide in 2020 compared to 2019, caused by COVID-19, are analyzed. This decay was uneven in space, as well as in individual countries, areas, poles, centers and cores. The strongest decline in 2020 occurred at airports of Europe (especially in the UK, Spain, Germany, and Italy) and Asia (particularly in India and Malaysia), medium – in the countries of America (the USA, Mexico, Brazil) and Norway, moderate – in Russia, weak – in China. 48% of all airports covered by the study showed a strong decline in passenger turnover (from 65 to 85%), 32% – medium (45 to 65%), 10% – moderate (30 to 45%). A catastrophic decline (over 85%) was recorded at 14 airports (2.7%), weak (15-30%) – in 26 (5%), insignificant (3-15%) – in 9 (1.7%). Stagnation (from -3% to + 3%) was noted only in 1 airport, and growth (more than + 3%) – in 3. The largest international airports with a high proportion of international transit passengers and airports with a narrow resort and tourist specialization were most affected by the covid crisis; less – airports with a dominance of domestic traffic. The pandemic has deformed the persistent territorial structure of world air traffic, which has formed over the past 60 years, and also violated the already established hierarchy of the largest and large airports not only around the world, but also within individual mega-regions and countries with big territories and populations.
    W artykule poddano analizie rodzaje spadków ruchu pasażerów na lotniskach spowodowanych skutkami pandemii COVID-19. Badanie przeprowadzono dla 517 portów lotniczych świata porównując zmiany jakie zaszły 2020 r. w stosunku do poprzedniego 2019 r. Obserwowane było niezwykle nierównomierne rozmieszczenie tego zjawiska w przestrzeni, a także w skali poszczególnych krajów, obszarów, biegunów, centrów i rdzeni. Największy spadek liczby obsługiwanych pasażerów wystąpił w 2020 r. na lotniskach Europy (szczególnie w Wielkiej Brytanii, Hiszpanii, Niemczech i Włoszech) oraz Azji (szczególnie w Indiach i Malezji). Średnie nasilenie tego procesu wystąpiło w krajach obu Ameryk (USA, Meksyk, Brazylia) oraz w Norwegii. Natomiast w Rosji spadek liczby obsługiwanych pasażerów miał charakter umiarkowany, a w przypadku Chin wręcz słaby. 48% wszystkich portów lotniczych objętych badaniem było dotkniętych silnymi spadkami (od 65 do 85%), 32% – średnimi (od 45 do 65%), 10% – umiarkowanymi (30 do 45%). Katastrofalne zmniejszenie się ruchu pasażerów (ponad 85%) odnotowano na 14 lotniskach (2,7%), słabe (15-30%) – w 26 (5%), nieznaczny (3-15%) – w 9 (1,7%). Brak zmiany (od -3% do +3%) miał miejsce tylko na jednym lotnisku, a wzrost (ponad +3%) – w trzech innych portach lotniczych. Największe międzynarodowe porty lotnicze z wysokim odsetkiem pasażerów w tranzycie międzynarodowym oraz porty lotnicze o wąskiej specjalizacji uzdrowiskowej i turystycznej najbardziej ucierpiały w wyniku kryzysu pandemicznego – mniej natomiast lotniska z przewagą ruchu krajowego. Pandemia zdeformowała stabilną strukturę terytorialną światowego ruchu lotniczego, która ukształtowała się w ciągu ostatnich 60 lat, a także naruszyła ustanowioną już hierarchię największych i większych lotnisk nie tylko na całym świecie, ale także w obrębie poszczególnych megaregionów i krajów z dużymi terytoriami i populacjami.
    Źródło:
    Prace Komisji Geografii Komunikacji PTG; 2021, 24(2); 18-39
    1426-5915
    2543-859X
    Pojawia się w:
    Prace Komisji Geografii Komunikacji PTG
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of the molecular dynamics method for modelling of mass transfer on the border of Ni-Al bimetal
    Zastosowanie metody dynamiki molekularnej do modelowania transferu masy na granicy bimetalu Ni-Al
    Autorzy:
    Starostenkov, M.
    Demina, I.
    Popova, G.
    Denisova, N.
    Smolarz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/408811.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    modelowanie komputerowe
    proces dyfuzji
    wakans
    metoda dynamiki molekularnej
    atom międzywęzłowy
    sieć krystaliczna
    transport masy
    method of computer modelling
    diffusion process
    vacancy
    method of molecular dynamics
    internodal atom
    crystalline lattice
    mass transfer
    Opis:
    One of the basic issues of examination of process of interaction of two-component alloys is the study of the mass transfer process in the presence of dot flaws: internodal atoms and vacancies. The study of this process in real experiments is impossible; therefore it is reasonable to apply computer modelling. The authors present a model of Ni-Al bimetal diffusion process produced by the method of molecular dynamics.
    Jednym z podstawowych zagadnień analizy procesu interakcji stopów dwuskładnikowych jest badanie procesu wymiany masy w obecności defektów punktowych: atomów międzywęzłowych i wakansów. Badania tego procesu w rzeczywistych eksperymentach jest niemożliwe, dlatego uzasadnione jest zastosowanie modelowania komputerowego. Autorzy przedstawiają model procesu dyfuzji w bimetalu Ni-Al stworzony metodą dynamiki molekularnej.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2012, 1; 36-38
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Technologies for monitoring the technical condition of transport infrastructure objects based on the coefficient of correlation between critical values of noise and useful signals
    Autorzy:
    Aliev, Telman
    Musaeva, Naila
    Powiązania:
    https://bibliotekanauki.pl/articles/2203895.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    noise
    useful signal
    noisy signal
    transport infrastructure object
    monitoring
    defect
    dynamics of malfunction development
    critical value of noise
    correlation coefficient
    szum
    użyteczny sygnał
    głośny sygnał
    obiekt infrastruktury transportowej
    monitorowanie
    defekt
    dynamika rozwoju usterki
    wartość krytyczna hałasu
    współczynnik korelacji
    Opis:
    Transport infrastructure objects are exposed to a large number of loads, which cause the formation of displacements, bends, wear, cracks, breakdowns, corrosion, and other defects. It is shown that at the moment of initiation of malfunctions in objects, the noise of the noisy signals coming from the corresponding sensor takes critical values that correlate with useful signals. Therefore, algorithms are developed for calculating the probability of random noise accepting critical values, a coefficient of correlation between the critical values of the noise and the useful component, and a relay cross-correlation function. Technologies for monitoring the technical condition of transport infrastructure objects are proposed based on the estimates of the developed noise characteristics. Computational experiments are conducted, and the reliability of the developed algorithms and technologies is confirmed.
    Źródło:
    Transport Problems; 2022, 17, 2; 213--224
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    FE numerical tests of railway wagon for intermodal transport according to PN-EU standards
    Autorzy:
    Krason, W.
    Niezgoda, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/202087.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    prototype railway wagon for intermodal transport
    FE methodology of numerical tests
    analysis of the wagon strength and dynamics simulations according to PN-EU standards
    prototyp wagonu kolejowego transportu intermodalnego
    FE
    metodologia testów numerycznych
    analiza wytrzymałości wagonu
    symulacja dynamiki wagonu
    normy PN-EN
    Opis:
    A special wagon, presented in the paper, can be used for intermodal transport of various types of vehicles. It enables transport of vehicles of 36 tons mass and height of 4m on the GB1 clearance height. An innovative wagon is equipped with a frame-support with marginal parts mounted on standard biaxial bogies and the central part lowered with a rotatable loading platform. The rotating part of wagon acts as a kind of platform, allowing truck to move through it during load/unload. During railway operation, this rotating platform is to become an integrated part of the wagon; the tailboards of the rotating part will be connected to the over-bogie part with the special locks. A unique concept of the wagon structure forced a design approach which was rather unusual for the rail industry. Since the design team aimed at very challenging demands of GB1 envelope and usage of standard bogies, the layout of the wagon had to be thoroughly examined in terms of its overall stiffness. Every major design change had to be simulated in order to accurately predict its influence on the whole wagon structure. FE analysis was used for numerical tests of such a wagon structure in different configurations. The calculations were carried out on the basis of PN-EN standards. Selected results of numerical tests of the prototype version of a such wagon for intermodal transports were presented in the paper.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 4; 843-851
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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