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Wyszukujesz frazę "road curve" wg kryterium: Temat


Wyświetlanie 1-6 z 6
Tytuł:
Investigation of vehicle stability on road curves in winter conditions
Autorzy:
Kemzuraite, K.
Pukalskas, S.
Bureika, G.
Powiązania:
https://bibliotekanauki.pl/articles/247233.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
vehicle stability
vehicle dynamics
road curve
road surface adhesion coefficient
lateral acceleration
road traffic safety
Opis:
The paper reveals peculiarities of a vehicle movement/operation on road curves when the road surface is slippery and/or snowy, with asphalt ruts. The survey of scientific works related to the lateral acceleration and movement dynamics of a vehicle is presented. Field experiments with different vehicles were carried out in winter conditions. The acceleration value and stability parameters depending on the speed of a vehicle and adhesion coefficient on road curves are analysed. Dependence of the vehicle lateral acceleration on road curves with various adhesion surfaces are given in graphical charts. Recommendations how to improve road safety by limitation of the speed in winter conditions are formulated. Finally, basic conclusions are given. Handling the vehicle on the road with the compressed snow surface (on the curve of the radius of 120 m) is much more dangerous when the adhesion coefficient of the wheels and the road is low if compared to handling the vehicle along the dry ruts at the same speed. When the vehicle moves along the curve of 120 m radius at a speed of 70 km/h, and the road surface is snowy, the lateral acceleration of 3.1 m/s2 is reached. The paper indicates that lateral acceleration of 3.1 m/s2 can be reached while moving along the snowy road with dry ruts at a speed higher in 27% (90 km/h). For improving the vehicle safety, it is recommended to have road signs on sharp turns/curves (R less than 120 m) to decrease the vehicle speed in 20 km/h.
Źródło:
Journal of KONES; 2011, 18, 4; 191-197
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Proactive assessment of road curve safety using floating car data: An exploratory study
Autorzy:
Ambros, Jiří
Altmann, Jarosław
Jurewicz, Chris
Chevalier, Anna
Powiązania:
https://bibliotekanauki.pl/articles/223484.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
floating car data
surrogate safety measure
traffic safety
road curve assessment
monitorowanie danych pojazdu
środki bezpieczeństwa
bezpieczeństwo na drodze
ocena łuku drogowego
Opis:
Driving speed is an important risk factor, especially when negotiating horizontal curves. Therefore it may be useful in extracting surrogate measures to proactively safety assessment, a practice consistent with a current shift towards a Safe System approach to addressing road trauma. Review of previous literature indicated two categories of studies: (1) studies focusing on a safe driving perspective, i.e. studies primarily interested in finding the cut-off point in FCD data characteristics between safe and unsafe driving; (2) studies focusing on relating meaningful risk rates (percentages of exceeding the risk thresholds) to specific locations, and thus identify safety critical sites. However, no study was found that specifically focused on the relationship between kinematic characteristics (other than just speed) and road curves. The presented study focused on exploring the relationship between acceleration and jerk thresholds and crashes occurring on road curves. The first objective was to determine meaningful acceleration and jerk thresholds to utilize in explaining safety performance when negotiating curves. For this purpose floating car data (FCD) from a fleet of company vehicles, driving in rural sections of national roads in the Czech Republic, was collected and used to derive and validate potential surrogate safety measures. FCD presents in-vehicle information with several benefits compared to traditional techniques, such as feasibility of data collection, relatively unlimited spatial coverage, and availability of historical data. In the analysis, lateral acceleration and longitudinal jerk were found to be the most influential measures of curve safety performance. To sum up, the exploratory study outlined a practical approach to proactive evaluation of road curve safety: FCD data can generate useful surrogate measures of curve safety (acceleration and jerks) associated with crash history. A larger study is required to strengthen robustness of the results and provide confidence necessary for practical application. Potential use cases may include conducting interim evaluations of curve road safety treatments, or in-vehicle monitoring devices for detection of potentially unsafe manoeuvers and providing real-time feedback to drivers based on a combination of identified safety thresholds.
Źródło:
Archives of Transport; 2019, 50, 2; 7-15
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Symulacje numeryczne stalowej bariery ochronnej na łuku drogi
Numerical simulations of curved road steel barrier
Autorzy:
Wilde, K.
Jamroz, K.
Budzyński, M.
Bruski, D.
Burzyński, S.
Chróścielewski, J.
Pachocki, Ł.
Witkowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/104373.pdf
Data publikacji:
2017
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
urządzenia BRD
ruch drogowy
bezpieczeństwo ruchu drogowego
badania numeryczne
zderzenia pojazdów
łuki poziome
droga
metoda elementów skończonych
road safety devices
numerical simulations
crash test
road curve
finite element method
Opis:
W pracy wymieniono pewne czynniki związane z bezpieczeństwem ruchu drogowego, wskazując łuki poziome dróg jako miejsca, gdzie występuje istotna liczba groźnych w skutkach wypadków. W części pracy obejmującej symulacje numeryczne, zrealizowano serię badań spełniających warunki testu zderzeniowego TB11 ze zmiennym promieniem bariery. Oszacowano wpływ zróżnicowania geometrii na parametry bezpieczeństwa.
The paper presents main factors related to traffic safety, indicating road curves as places of occurrence of significant number of fatal accidents. In the numerical simulations, a series of tests with variable radius of barrier in the TB11 crash test was performed. The effect of differentiation of barrier geometry on safety parameters was assessed.
Źródło:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2017, 64, 3/I; 535-546
2300-5130
2300-8903
Pojawia się w:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effects of vehicle load on driving characteristics
Autorzy:
Rievaj, Vladimir
Vrábel, Ján
Synák, František
Bartuška, Ladislav
Powiązania:
https://bibliotekanauki.pl/articles/102297.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
gravity center of vehicle
road curve radius
speed at passage
directional deviation
vehicle stability
środek ciężkości pojazdu
promień łuku drogowego
prędkość w przejściu
odchylenie kierunkowe
stabilność pojazdu
Opis:
Many traffic accidents are due to an incorrect assessment of the current situation by the driver of the vehicle. With correct assessment of the situation, the driver has also to take into account a number of other factors. This article focuses on some of these factors such as the vehicle load, vehicle speed and curve radius. The first part of the article deals with the position of the vehicle center of gravity (CG), which has a major impact on the driving characteritics of the vehicle. The paper demonstrates the calculation of the maximum speed of a car model and truck model (without load and with load) when cornering. The center of gravity has an effect on the vehicle axles load distribution, and thereby on braking forces. This issue is dealt with in the second part of the paper. In the last part the calculation of the braking force as a function of the adhesion coefficient of the tires depending on the road surface is mentioned. The importance of the contribution consists in quantifying the impact of vehicle load on its driving characteristics.
Źródło:
Advances in Science and Technology. Research Journal; 2018, 12, 1; 142-149
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of Road Transport on Air Pollution in EU Countries
Wpływ transportu drogowego na zanieczyszczenie powietrza w krajach UE
Autorzy:
Ochnio, Luiza
Koszela, Grzegorz
Rokicki, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/1811647.pdf
Data publikacji:
2020
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
road transport
transport infrastructure
air pollution
EU
environmental Kuznets curve
multidimensional data analysis
transport drogowy
infrastruktura transportowa
zanieczyszczenie powietrza
UE
środowiskowa krzywa Kuznetsa
wielowymiarowa analiza danych
Opis:
The main purpose of the work is to show the level of air pollution emitted by road transport and its relationship with economic development and transport infrastructure in European Union countries. The study presents the diversity in emissions of road transport by countries, shows the dynamics of changes in this area, determines the relationships between the level of economic development, equipping with road infrastructure and emissions of air pollution in EU countries. The research period concerned the years 2006-2017. The sources of data was EUROSTAT database. The ranking built by means of multidimensional data analysis tools indicated Portugal and Luxembourg as countries with relatively high emissions of air pollutants (group 3), countries with moderate emissions are Bulgaria, Malta, Cyprus and Sweden (group 2). Analysis of data on the rate of change in emissions and the volume of GDP in EU countries also indicates compliance with the Kuznets environmental curve.
Celem głównym pracy było porównanie poziomu zanieczyszczenia powietrza emitowanego przez transport drogowy i jego związku z rozwojem gospodarczym i infrastrukturą transportową w krajach Unii Europejskiej w latach 2006-2017. W pracy przedstawiono zróżnicowanie w emisji zanieczyszczeń przez transport drogowy w krajach UE, ukazano dynamikę zmian w tym zakresie, określono związki i między poziomem rozwoju gospodarczego, wyposażeniem w infrastrukturę drogową, a emisją zanieczyszczeń powietrza. Dane pochodziły z baz i raportów EUROSTAT. Zbudowany za pomocą metod wielowymiarowej analizy danych ranking szeregujący Państwa pod względem emisji związków do atmosfery pochodzących z transportu i uwzględniając infrastrukturę drogową oraz powierzchnię kraju, wskazał na Portugalię i Luksemburg jako kraje o stosunkowo dużej emisji (grupa 3), kraje o umiarkowanej emisji to Bułgaria, Malta, Cypr oraz Szwecja (grupa 2). Analiza tempa zmian emisji zanieczyszczeń do powietrza oraz wielkości PKB w krajach Unii wskazuje także na zgodność ze środowiskową krzywą Kuznetsa.
Źródło:
Rocznik Ochrona Środowiska; 2020, Tom 22, cz. 2; 1058-1073
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on the road linear optimization design of bridge and tunnel connecting segment in the canyon
Autorzy:
Wang, Lu
Liu, Yuwen
Chen, Xiaoxin
Powiązania:
https://bibliotekanauki.pl/articles/223553.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
traffic engineering
curved road
simulation experiment
radius of curve
bridge
tunnel
traffic safety
inżynieria ruchu
łuk drogi
eksperyment symulacyjny
promień łuku
most
tunel
bezpieczeństwo na drodze
Opis:
It is easy to skid and roll by centrifugal force and wind, which affects the safety of the vehicle. At the same time, the special location of bridge and tunnel connecting segment in the canyon will accelerate the wind, and make the transverse wind play a more important role in driving vehicles. Based on the acceleration effect of canyons on wind, the vehicle model is simulated by Carsim software, and the road and wind models are established. It is studied that the vehicle has different radius of circular curve under different wind levels, corresponding to different superelevation. The lateral acceleration, lateral deflection and transverse force coefficient are selected as the running state of the vehicle at different speeds to research the linear optimization design of bridge and tunnel connecting segment in the canyon. The result shows that when the wind force exceeds the fifth grade, it is possible for the vehicle to overturn under the limit minimum radius required by the standard value. In order to ensure the stability and safety of the vehicle, this paper considers the geographical position of bridge and tunnel connecting segment in the canyon and the relationship between the radius of the superelevation and circular curve. What’s more, it puts forward the optimal limit minimum radius of the circular curve with different wind grades of 5-9 grades. At the same time, when the road alignment cannot be optimized under the condition, this paper puts forward the speed limit that the vehicle safety can be guaranteed under different wind speed conditions. The speed limit can provide reference for traffic management and safety guarantee of mountain expressway.
Źródło:
Archives of Transport; 2019, 52, 4; 81-93
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-6 z 6

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