Temat: vehicle modelling - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Model-based engineering-simulation based design of the suspension of city bus
Autorzy:: Kowarska, I.
Skarbek, J.
Kuczek, K.
Uhl, T.
Powiązania:: https://bibliotekanauki.pl/articles/247227.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
road transport
simulation
vehicle modelling
vehicle suspension
Opis:: Process of designing of vehicle suspension as a combination of springs and dampers is a very complicated task. In general it requires designing system respecting good ride comfort and good handling at the same time. It is obvious that these two aspects are dependent also of the type of the road on which vehicle is riding. Especially it is important in city buses which are workplaces for bus drivers and each day are transporting thousands of people. Bus suspension system is quite different from car suspension. Because of the mass and size instead of traditional springs, pneumatics springs are used. In some cases, values of damping and stiffness of the spring are adjusted to the proper road in a real bus while driving. It is necessary nowadays to have a virtual assessment that can simulate "bus suspension behaviour" to abstracted suspension parameters such as springs and dampers characteristics. In this paper a multibody model of city bus suspension has been presented. Multibody models are the best way of simulation of dynamic behaviour of the vehicle. Simulations showing how different types of the road affect the structure of the vehicle have been performed. Such prepared model can be then use as an input for optimization of the bus suspension in terms of ride comfort, handling, or even passengers' safety.
Źródło:: Journal of KONES; 2011, 18, 4; 205-212
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Mobile model for the investigation of dynamics of motor vehicles
Mobilny model do badań dynamiki samochodów
Autorzy:: Romaniszyn, K.
Powiązania:: https://bibliotekanauki.pl/articles/263520.pdf
Data publikacji:: 2013
Wydawca:: Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
Tematy:: mobilny model
modelowanie dynamiki
podobieństwa
mobile model
similitude
vehicle dynamics modelling
Opis:: The problems that are often encountered at the investigations of stability of large motor trucks and special vehicles have been presented. A concept of the construction of remotely controlled mobile vehicle model s, the characteristics of which may roughly represent the stability of real vehicles, has been proposed. An assumption was made that the models being built should meet selected criteria of similitude to the real vehicle to be represented (the "prototype"). Problems arising at the construction of such models have been described. One of the model s was built to test rollover warning devices in both dynamic and static conditions. lt was made in a dimensional scale of 1:10. The vehicle model was driven by an electric motor combined with a three-speed mechanical gearbox. The other model was intended to map the stability of motion of a predefined real vehicle with maintaining selected similitudes between the model and its prototype. This model was built in a dimensional scale of about 1:5. It was driven by a two-stroke internal combustion engine and its power transmission system offered the 4x2 or 4x4 wheel arrangement options. The control system of the vehicle model enabled the mapping of stability tests in accordance wit h selected ISO standards. The work described herein was done within the research and development project No. PB 5478/B/ T02/2017/40 "Evaluation of stability of a real vehicle based on the testing of a mobile model" financed by the National Centre for Research and Development (NCBiR).
W publikacji zostały przedstawione problemy, na jakie napotyka się przy badaniach stateczności dużych samochodów ciężarowych i samochodów specjalnych. Zaprezentowano koncepcję budowy mobilnych, zdalnie sterowanych modeli samochodów, których cechy mogą w pewnym przybliżeniu odwzorowywać stateczność pojazdów rzeczywistych. Założono, że budowane mobilne modele powinny spełniać wybrane kryteria podobieństwa w stosunku do pojazdu rzeczywistego. W publikacji tej zostały opisane problemy przy budowie takich modeli. Pierwszy z nich został zbudowany w celu badań sygnalizatorów zagrożenia wywrotem zarówno w warunkach dynamicznych, jak i statycznych. Model ten zbudowano w skali 1: 10 w stosunku do wielkości samochodu rzeczywistego. Samochód był napędzany silnikiem elektrycznym współpracującym z trzybiegową mechaniczną skrzynią przekładniową. Konstrukcja drugiego ma z założenia odwzorowywać stateczność ruchu zadanego pojazdu rzeczywistego przy zachowaniu wybranych podobieństw między modelem i samochodem rzeczywistym. Samochód ten zbudowano w skali około 1:5 w stosunku do wymiarów samochodu rzeczywistego. Napęd modelu stanowił dwusuwowy silnik spalinowy, a układ napędowy umożliwiał napęd 4x2 lub 4x4. Układ sterowania modelem samochodu pozwalał na odwzorowywanie badań stateczności zgodnie z wybranymi standami ISO. Zaprezentowana praca powstała w trakcie realizacji projektu badawczo- rozwojowego NCBR nr. PB 5478/B/T02/2011/40 pt. "Ocena stateczności rzeczywistego pojazdu na podstawie badań mobilnego modelu".
Źródło:: Archiwum Motoryzacji; 2013, 1; 53-64
1234-754X
2084-476X
Pojawia się w:: Archiwum Motoryzacji
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Study of freight wagon running dynamic stability taking into account the track stiffness variation
Исследование динамической стабильности движения грузового вагона при изменениях жесткости железнодорожного пути
Autorzy:: Steisunas, S.
Bureika, G.
Powiązania:: https://bibliotekanauki.pl/articles/375610.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:: rail vehicle dynamic modelling
creep forces calculation
Nadal’s criterion
pojazd szynowy modelowany dynamiczne
Opis:: Authors analysed the rail dynamic models of rail vehicle and surveyed the features of the system “vehicle-track” modelling. Algorithms of creep forces calculation were examined. Four-axle freight wagon movement on the straight track and on curves corresponding to the given vertical and transversal track irregularities was modelled by software tool "Universal Mechanism". Authors examined the track stiffness influence on the vehicle moving stability/safety parameters at different speed, vehicle weight and track irregularities considering different wear rail profiles. Finally, basic conclusions and recommendations are given.
Авторы проанализировали динамические модели рельсовых экипажей и рассмотрели особенности моделирования системы «вагон-путь». Рассмотрены алгоритмы расчета сил крипа. С помощью программного пакета «Универсальный механизм» было смоделировано движение четырехосного грузового вагона по прямой трассе и по кривой с учетом вертикальных и горизонтальных неровностей рельсовых нитей. Авторы исследовали влияние жесткости железнодорожного пути на параметры стабильность/безопасность движения рельсового экипажа, движущегося с разной скоростью, с разной массой вагона и с учетом профилей рельсов различного износа. В конце сформулированы основные выводы и рекомендации.
Źródło:: Transport Problems; 2014, 9, 4; 132-143
1896-0596
2300-861X
Pojawia się w:: Transport Problems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Numerical and experimental research on the dynamic loads in military vehicles
Autorzy:: Rybak, P.
Borkowski, W.
Wysocki, J.
Powiązania:: https://bibliotekanauki.pl/articles/949498.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: military vehicle
armoured vehicle
load
research
modelling
experiment
Opis:: The work presents the fragments of research on the dynamic loads acting on selected military vehicles. Designing new armoured vehicles or introducing modifications is preceded by model tests carried out under various conditions, analysing the effect of dynamic loads which may result during the use of the vehicle, e.g. due to the roughness of the road, firing, IED explosions or the vehicle being hit by a shell. The main purpose of conducting model research and verifying their findings in experimental research is to improve the effectiveness and safety of operation of systems and installations of military vehicles, increase the dynamics of the movement, improve the protection and ensure that the crew is not killed. Among the used models of military vehicles, discrete models are applied, formulated in the adjusted Lagrange description, as well as the models based on the fine element method for highly nonlinear problems and forces acting for a very short time. Due to the unique selection of military equipment, the methods of calculation and analysis of model research (simulations) and experimental research presented in the work are considered qualitative rather than quantitative.
Źródło:: Journal of KONES; 2016, 23, 4; 435-441
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Testing of protective covers for special vehicles
Autorzy:: Rybak, P.
Borkowski, W.
Michałowski, B.
Hryciów, Z.
Powiązania:: https://bibliotekanauki.pl/articles/243297.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combat vehicle
transportation vehicle
explosive charge
modelling
protective structure
Opis:: In the paper were presented threats happen to special and transportation vehicles while task performing within the confines of peace forcing and keeping missions on world areas threatened by conflicts and that could be areas of unitfuture actions. Based on available materials and authors results of numerical and experimental tests, effects of various explosive charges action on special vehicles were presented. Such explosive charges could be used during fighting in urban and mountainous areas as well as other with limited area. Were presented directions of research and development leading to increase protection level for people, inside special and transportation vehicle, against combat agents characteristic for peace keeping and stabilization missions that could be used also while warfare. In the paper were presented numerical model of protection structure, which were worked out on the basis of the Finite Element Method. There are presented some results of experimental and modelling tests of after blast shock wave action on armoured shell and prepared protection structures for special and transportation vehicles. The maximum deformations of research objects and stress in construction were put. The comparisons of results for numerical and experimental researches were introduced. Protecting structure was loaded by shock wave pressure generated by hypothetical unconventional explosive charge (improvise explosive device or non-contact mine). In the paper were also made effort to point at possibility and necessity to choose the most effective parameters of structure for protected part of combat vehicle against potential threats.
Źródło:: Journal of KONES; 2008, 15, 1; 219-226
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Experimental research on identifying data for modelling special purpose vehicles
Autorzy:: Rybak, P.
Wysocki, J.
Hryciów, Z.
Michałowski, B.
Wiśniewski, A.
Powiązania:: https://bibliotekanauki.pl/articles/245056.pdf
Data publikacji:: 2017
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: special purpose vehicle
combat vehicle
loads
experimental research
modelling
Opis:: The work presents selected results of experimental research on special purpose vehicles used on military training grounds, and bench tests of their main structural elements. The results are connected mainly with identifying the main vibration parameters of those vehicles (regarding weight, resilience and damping), and with the assessment of the level of dynamic loads. The more output data experimental research provides, the more input data we have for designing models. Determined in laboratory tests, weight parameters (regarding weight and moments of inertia), coefficients of stiffness and damping, as well as selected resilience and damping characteristics, are applied in the process of creating the numerical models of assemblies, systems, and complete vehicles. The numerical models created are subject to full verification in order to minimize the differences between the real objects and their representations. The models are applied in multivariate simulation tests of the existing design solutions, upgrading them, or creating new designs. Due to a certain sensitivity of the range of special purpose vehicles, the results of experimental tests and simulation analyses presented in the work are mainly qualitative rather than quantitative.
Źródło:: Journal of KONES; 2017, 24, 3; 245-252
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

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

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Skocz do pozycji: 8.

Tytuł:: Improvised explosive devices in confrontation with the protection armour
Autorzy:: Borkowski, W.
Rybak, P.
Powiązania:: https://bibliotekanauki.pl/articles/245917.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combat vehicle
improved explosive devices
modelling
Opis:: The paper describes the risk for carrying structures of special vehicles used in the stabilization and peacekeeping missions. Presented map regions of the world threatened by conflicts, which may be areas for future International peacekeeping forces. Among the hazards occurring in the missions improvised explosives devices (IED) deserve special attention. Difficult to detect and identify, acting unpredictably, high-power is destruction. Based on the available material and the results of their experimental studies are presented effects ofexplosives on special vehicles. It takes into account the cases of impact load during the flghting in the urban area, desert and mountainous. The currently used improvised explosives devices and methods of their initiation are described. Presented used in vehicles ways to protect people and internal equipment against destruction factors of explosives. The effects of the influence of loads on vehicles are shown. The results of its own, both experimental and model tests are presented. The results ofthe analysis presented in the drawings and diagrams. Carried out experimental researches have allowed to obtain Information necessary to verify: research object models in terms of assessing the level of deformation on the structure and size of dynamic load acting on crews of combat vehicles, and numerical model of the propagation of after explosion shock waves.
Źródło:: Journal of KONES; 2010, 17, 1; 67-72
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Hydropneumatic suspension modelling for wheeled armoured fighting vehicle
Autorzy:: Ławniczak, S.
Simiński, P.
Powiązania:: https://bibliotekanauki.pl/articles/242251.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport
AFV vehicle
hydropneumatic suspension system
modelling
Opis:: The paper shall present the way for building a model for simulation studies of the wheeled armoured fighting vehicle with hydropneumatic suspension of driving wheels axles. Thus developed model shall be used to conduct simulation studies in the area of the vehicle safety. The scope of terms and conditions for applications of hydropneumatic suspensions in wheeled armoured fighting vehicles is justifled due to a number of their advantages, such as: progressive characteristics of elasticity provides great driving comfort with a small load, as well as apossibility of placing a considerable load on the vehicle (the requirements are mutually exclusive in classical suspension). Compressed nitrogen, sealed in the sphere using an elastic diaphragm, is approximately six-fold more flexible than steel springs elements at static load of the suspension, which provides high level of driving comfort; apossibility to lower the height of the vehicle by changing the road clearance which effects in e.g. higher availability for airborne transport and soon. However, they are not free from disadvantages; therefore, it is the studies of their justified use, especially related to traffic safety, that should have a final say in individual cases. The here to presented model of hydropneumatic suspension and the vehicle motion model are applied to assess dynamic capabilities and evaluate the real object motion safety.
Źródło:: Journal of KONES; 2009, 16, 2; 285-297
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Road vehicle sequencing problem in a railroad intermodal terminal – simulation research
Autorzy:: Jacyna, M.
Jachimowski, R.
Szczepański, E.
Izdebski, M.
Powiązania:: https://bibliotekanauki.pl/articles/200619.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: intermodal terminal
road vehicle sequencing
FlexSim simulation
modelling
Opis:: The paper presents the issue of container handling processes at a railroad intermodal terminal. The main purpose of this paper is the assessment of the handling equipment utilization and the associated energy consumption. The authors analyze how the road vehicle availability at the moment specified in the containers loading schedule influences the total handling equipment operation time as well as the necessary number of handling equipment. It is assumed that vehicles planned for loading of import containers may be late for loading, which causes some interruptions in the loading schedule. Such interruptions are identified with the necessity to handle the next container for which the road vehicle is already waiting, which influences the handling equipment utilization and, finally, energy consumption. The general mathematical model of the problem developed in the FlexSim simulation software was presented. Based on the simulation research, it pointed out that proper road vehicles loading sequencing can significantly reduce handling equipment operation time, and thus energy consumption, costs, and CO2 emissions. The literature analysis presented in the paper indicates that most of the research in the field of intermodal transport is focused on operations optimization in container ports. There are differences between two types of intermodal terminals in operation procedures and rules. That is why the authors decided to undertake the problem of road vehicle sequencing including their random availability and its influence on handling device operation time, which has not been considered in the literature so far.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 5; 1135-1148
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Ways of uneven road surface modelling used in the vehicle dynamics analysis
Autorzy:: Tengler, S.
Harlecki, A.
Powiązania:: https://bibliotekanauki.pl/articles/247939.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: vehicle dynamics
uneven road surface modelling
computer simulation
Opis:: An important issue, which should be taken into account while analyzing the dynamics of vehicles moving along an uneven road surface, is the proper representation of its real shape. Two mathematical models of the road surface - continuous and discrete were considered in the method presented in this paper. These models were used in the computer simulations of dynamics of a special vehicle with a high gravity centre, which moved along an uneven road surface. The simulations were carried out using the worked out program package, in which four main modules could be differentiated such as: preprocessor, solver, postprocessor and 3D animation. This package was implemented combined with the Blender graphics environment – in authors’ opinion it is an innovative approach. Owing to this models of uneven road surface (theoretically of any shapes) can be built and they are input data for both the solver and animation modules. Additionally, the Blender tool can be used to prepare 3D objects, which are used in the animation process of the moving model of a vehicle. According to the authors', developed program package developed on the basis of the mathematical models for the analyzed vehicle and road surface can be interesting for engineers designing special vehicles. By performing different types of the computer simulations, the engineers can improve the vehicle being built and reduce cost of its road test.
Źródło:: Journal of KONES; 2012, 19, 1; 441-451
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Method for accuracy assessment of topo-bathymetric surface models based on geospatial data recorded by UAV and USV vehicles
Autorzy:: Lewicka, Oktawia
Powiązania:: https://bibliotekanauki.pl/articles/27311754.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: terrain modelling
coastal zone
geospatial data
Unmanned Aerial Vehicle
UAV
Unmanned Surface Vehicle
USV
Opis:: Geospatial data obtained using Unmanned Aerial Vehicles (UAVs) and Unmanned Surface Vehicles (USVs) are increasingly used to model the terrain in the coastal zone, in particular in shallow waterbodies (with a depth of up to 1 m). In order to generate a terrain relief, it is important to choose a method for modelling that will allow it to be accurately projected. Therefore, the aim of this article is to present a method for accuracy assessment of topo-bathymetric surface models based on geospatial data recorded by UAV and USV vehicles. Bathymetric and photogrammetric measurements were carried out on the waterbody adjacent to the public beach in Gdynia (Poland) in 2022 using a DJI Phantom 4 RTK UAV and an AutoDron USV. The geospatial data integration process was performed in the Surfer software. As a result, Digital Terrain Models (DTMs) in the coastal zone were developed using the following terrain modelling methods: Inverse Distance to a Power (IDP), Inverse Distance Weighted (IDW), kriging, the Modified Shepard’s Method (MSM) and Natural Neighbour Interpolation (NNI). The conducted study does not clearly indicate any of the methods, as the selection of the method is also affected by the visualization of the generated model. However, having compared the accuracy measures of the charts and models obtained, it was concluded that for this type of data, the kriging (linear model) method was the best. Very good results were also obtained for the NNI method. The lowest value of the Root Mean Square Error (RMSE) (0.030 m) and the lowest value of the Mean Absolute Error (MAE) (0.011 m) were noted for the GRID model interpolated with the kriging (linear model) method. Moreover, the NNI and kriging (linear model) methods obtained the highest coefficient of determination value (0.999). The NNI method has the lowest value of the R68 measure (0.009 m), while the lowest value of the R95 measure (0.033 m) was noted for the kriging (linear model) method.
Źródło:: Metrology and Measurement Systems; 2023, 30, 3; 461--480
0860-8229
Pojawia się w:: Metrology and Measurement Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Modeling and analysis of a twin-tube hydraulic shock absorber
Modelowanie i analiza dwururowego tłumika hydraulicznego
Autorzy:: Ferdek, U.
Łuczko, J.
Powiązania:: https://bibliotekanauki.pl/articles/280494.pdf
Data publikacji:: 2012
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: hydraulic damper
shock absorber
damping force
modelling
vehicle suspension
Opis:: In this paper, a physical and mathematical model was created for a twin-tube hydraulic shock absorber, using oil as the working medium. To analyze the model, methods of numerical integration were incorporated. The effect of the amplitude and frequency of the excitation, as well as the parameters describing the flow rate of oil through the valves, were examined. The basic characteristics of the damping force were obtained.
W pracy wprowadzono model fizyczny i matematyczny dwururowego amortyzatora hydraulicznego, w którym czynnikiem roboczym jest olej amortyzatorowy. Do jego analizy wykorzystano metody numerycznego całkowania. Zbadano wpływ amplitudy i częstości wymuszenia oraz parametrów opisujących przepływ oleju przez zawory. Wyznaczono podstawowe charakterystyki siły tłumienia.
Źródło:: Journal of Theoretical and Applied Mechanics; 2012, 50, 2; 627-638
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Evaluation of light commercial vehicles operation process in a transport company using the regression modelling method
Autorzy:: Owczarek, Paulina
Brzeziński, Marian
Zelkowski, Jarosław
Powiązania:: https://bibliotekanauki.pl/articles/2172037.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:: vehicle operation
light commercial vehicles
economic efficiency
regression modelling
Opis:: This paper presents an analysis of the results of daily observations from the execution of transport orders by three types of vehicles over a period of 2 years. The purpose of the research was to evaluate the operation process and determine the influence of important technical and operational variables on the economic efficiency of the operation process. A set of 7 quantitative variables, previously not considered in the evaluation of the commercial vehicle operation process, was subjected to statistical data analysis. An indicator analysis and evaluation of the intensity of use of the following types of vehicles was conducted: Renault Master, Fiat Ducato and Citroen Jumper. Based on the results of the research, the vehicle with the highest efficiency was determined and possible assumptions of the strategy applied in the company were indicated. The analysis and evaluation of vehicle efficiency gave rise to the identification of independent variables determining the company's income. Using the indicator method and the multivariate regression model, transport companies can evaluate the efficiency of transport tasks undertaken.
Źródło:: Eksploatacja i Niezawodność; 2022, 24, 3; 522--531
1507-2711
Pojawia się w:: Eksploatacja i Niezawodność
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Analysis of possibilities for the use of volume-delay functions in the planning module of the Tristar system
Autorzy:: Oskarbski, J.
Jamroz, K.
Smolarek, L.
Zawisza, M.
Żarski, K.
Powiązania:: https://bibliotekanauki.pl/articles/375581.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:: modelling
ITS
vehicle speed
volume-delay function
modelowanie
prędkość pojazdu
Opis:: Travel time is a measure commonly used for traffic flow modelling and traffic control. It also helps to evaluate the quality of traffic control systems in urban areas. Traffic control systems that use traffic models to predict changes and disruptions in vehicle flows have to use vehicle speed-prediction models. Travel time estimation studies the effects of traffic volumes on a street section at an average speed. The TRISTAR Integrated Transport Management System, currently being deployed across the Tri-City (Gdansk, Sopot, Gdynia), is almost completed and data obtained from the System can be useful for the development of prediction models. A procedure for travel speed model selection for the Tri-City street network is presented in this paper. Matching of chosen volume-delay functions to the data obtained from the TRISTAR has been tested. Analyses have shown insufficient matching of functions that does not justify the possibility of their use in traffic control due to variability in different conditions of traffic, weather and, in the case of an incident, which justifies the need for further research aimed at satisfying matching of functions depending on the above-mentioned factors.
Źródło:: Transport Problems; 2017, 12, 1; 39-50
1896-0596
2300-861X
Pojawia się w:: Transport Problems
Dostawca treści:: Biblioteka Nauki

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