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Wyszukujesz frazę "vehicle maneuver" wg kryterium: Temat


Wyświetlanie 1-4 z 4
Tytuł:
Utilizing crash and violation data to assess unsafe driving actions
Autorzy:
Rezapour Mashhadi, M. M.
Wulff, S. S.
Ksaibati, K.
Powiązania:
https://bibliotekanauki.pl/articles/2140833.pdf
Data publikacji:
2017
Wydawca:
Fundacja Centrum Badań Socjologicznych
Tematy:
No Improper driving
improper lane change
drive too fast for conditions
violation
citation
enforcement
Traffic Safety
road safety
Multinomial logistic regression
vehicle maneuver
point of impact
Opis:
Wyoming has one of the highest crash rates in the United States and a higher fatality rate than the U.S. average. These high rates result from many factors such as the high traffic through I-80 and the mountainous areas of Wyoming. This study employed two approaches to study contributory factors to crashes in the most hazardous interstate, I-80, in Wyoming by employing crash and citation data sets. Different factors may contribute to different driver actions so it is important to consider these crash causes separately. Thus, multiple logistic regression models were used in this study to examine the differences in crash-contributing factors for three driver actions: driving too fast for conditions, improper lane change, and no improper driving. These driver actions account for about 70% of all the crash causes on this interstate. The same violations as the two driver actions, improper lane change and driving too fast for conditions, account for 42% of all the crashes. The literature has indicated that previous violations can be used to predict future violations, and consequently crashes. Therefore, these violations were identified to detect the groups that are at higher risk of involvement in crashes. The analyses indicated that there are substantial differences across different driver actions for crash and violation data. For instance, not-dry-surface conditions increased the estimated odds of driving too fast for conditions 33 times while it decreased the risk of no improper driving by an estimated 250%. Crash severity, number of vehicles, vehicle maneuver, point of impact, driver condition, and speed compliance also impacted different driver actions differently. The results of violation analyses revealed that the interaction between types of vehicle and various variables were significant. For instance, nonresident truck drivers were more likely to violate all types of risky violations, which increased the estimated odds of crashes, compared with resident truck drivers. Recommendations based on the results are provided for policy makers to reduce high crash rate in the state.
Źródło:
Journal of Sustainable Development of Transport and Logistics; 2017, 2, 2; 35-46
2520-2979
Pojawia się w:
Journal of Sustainable Development of Transport and Logistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of freeplay and friction in steering system on double lane change manoeuvre - modelling and simulation studies
Autorzy:
Więckowski, D.
Żardecki, D.
Powiązania:
https://bibliotekanauki.pl/articles/242049.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
vehicle dynamics
steering system
freeplay
friction
mathematical models
luz(...) and tar(...) projections
simulation studies
sensitivity analysis
optimization of maneuver
double lane change maneuver
Opis:
Modelling and simulation investigations of a car non-linear dynamics with regard to freeplay (backlash in steering gear) and friction (kinetic and static friction in king-pins) is always a challenge for researchers. Fortunately, by special luz(...) and tar(...) projections and their mathematical apparatus the elaborated models and simulation procedures of stick-slip phenomena in a steering system are managed in efficient forms (without any entangle constraints) even for optimization and sensitivity studies. Exactly, the presented studies deal with problems of sensitivity of optimized maneuvers for vehicle models considering freeplay / friction effects. Double lane change maneuvers (overtaking and avoiding) are discussed. A criterion function refers to several evaluations (precision of maneuver, calm steering, feeling of comfortable travel). The optimization of steering wheel angle signal is done on a reference model with "nominal" freeplay and friction parameters. Such input signal is applied to a "real" vehicle having "real" freeplay and friction parameters. The differences of output signals as well as differences between criterion function values are a subject of sensitivity analysis. The sensitivity of reference models on a variation of freeplay and friction parameters appears as important from theoretical as well as practical points of view. The paper takes up the problems of sensitivity analysis of steering system model applied for synthesis steering algorithms for a double lane change maneuver.
Źródło:
Journal of KONES; 2011, 18, 2; 483-492
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study of the dynamic parameters influence over the behavior of the two-section articulated vehicle during the lane change manoeuvre
Исследование влияния динамических параметров на поведение двухзвенного сочлененного автопоезда во время маневра перемены полосы движения
Autorzy:
Rusev, R.
Ivanov, R.
Staneva, G.
Kadikyanov, G.
Powiązania:
https://bibliotekanauki.pl/articles/374119.pdf
Data publikacji:
2016
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
articulated vehicle
stability
lane change maneuver
simulation
pojazd przegubowy
stabilność
manewr zmiany pasa ruchu
symulacja
Opis:
The course stability and the steerability of the two-section wheeled vehicle at high velocities during the lane change manoeuvreare studied in this paper. Mechanic-mathematical model is developed, on which base simulation programmes are elaborated. Simulation studies of the course stability at different velocities depend on some constructive and exploitation factors are made by these models. Based on the simulation results an idea for an algorithm and a semi-active control system of the resistance in the pulling-supporting device is proposed.
В этой работе исследованы курсовая устойчивость и управляемость двухзвенного колесного автопоезда во время маневра перемены полосы движения с высокими скоростями . На основании предложенной механик о – математической модели, разработаны симуляционные программы . Спомощью этой модели проведены симуляции движения , показывающие зависимость курсовой устойчивости и упра вляемости от некоторых конструктивных и эксплуатационных факторов . В результате симуляций предложены алгоритм и полуактивная система управления сопротивлением седельно – сцепного устройства.
Źródło:
Transport Problems; 2016, 11, 1; 29-40
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selected aspects of motor vehicle dynamics on the example of a power-off straight line maneuver
Autorzy:
Kisilowski, Jerzy
Zalewski, Jarosław
Powiązania:
https://bibliotekanauki.pl/articles/224116.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
motor vehicle dynamics
power-off
straight line maneuver
traffic safety
dynamika pojazdu samochodowego
wyłączenie zasilania
manewry po prostej
bezpieczeństwo ruchu
Opis:
In this paper the selected phenomena related to motor vehicle’s motion have been considered basing on a computer simulation. The vehicle performed a power-off straight line maneuver with different road conditions being included. All simulations have been performed in the MSC Adams/Car environment based on the available sports two-seater vehicle model, realizing the adopted maneuver at the instant speed of 100km/h. This enabled observation of the selected phenomena along the road long enough to relate them to different aspects of vehicle dynamics research. As for the randomly uneven road, almost similar and almost different profiles have been assumed for the left and right wheels of the vehicle. Additionally, two values of the coefficient determining the maximum amplitude of road irregularities have been selected: 0.3 for lower and 0.9 for higher irregularities, so the road surface conditions along with the flat road have been considered as one of the factors causing disturbances of the motor vehicle motion. Such research seems valuable from the point of view of road traffic safety and vehicle maintenance. This specific example is a presentation of the possible research on vehicle dynamics as well as a potential background for further considerations including different types of vehicles along with almost different road profiles for the left and right wheels of the given vehicle model. A power-off straight maneuver is not performed very often in normal road traffic. However, such test could be valuable when analyzing influence of the selected motor vehicle parameters, such as uneven loading, suspension characteristics, etc. on such maintenance features as stability, steerability and the influence of external disturbances acting on the moving vehicle. Further research provides different maneuvers and different simulation conditions.
Źródło:
Archives of Transport; 2019, 50, 2; 57-76
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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