scholarly journals MODELING OF THE MECHANISM OF VEHICLE OVERTURNING IN THE PROCESS OF DEVELOPMENT OF ROAD TRAFFIC ACCIDENT

2019 ◽  
Vol 20 (2) ◽  
pp. 320-328
Author(s):  
S. Povalyaev ◽  
O. Saraiev
Keyword(s):  
Mathematical Model ◽  
Mathematical Models ◽  
Critical Speed ◽  
Traffic Accidents ◽  
Road Traffic ◽  
Center Of Mass ◽  
Road Traffic Accidents ◽  
Basic Parameters ◽  
The Moment ◽  
Comparison Of The Results

The development of mathematical models of vehicle overturning has been given significant attention by many researchers because of the need to obtain reliable information on the circumstances of road traffic accidents. Research of road traffic accidents with the overturning of vehicles is related with the difficulty to determinate the mechanism of overturning, because expert calculation methods do not always use the adapted mathematical models. Most of the methods focus on determining the minimum (critical) speed of vehicles, which leads to its overturning. However, the real speed of vehicles before overturning can be much higher. In this paper, a mathematical model of the process of vehicle overturning after a collision with an immovable lateral obstacle is given. Thus the overturning moment caused by the inertia forces acts on the vehicle, and the moment from the gravity that holds the vehicle from overturning. It is necessary to mark that the shoulder of moment from gravity changes from a maximal value to 0 in the process of vehicle overturning. The mathematical model is based on the basic equation of dynamics for rotational motion. The developed mathematical model is a nonlinear homogeneous differential equation of second order. A solution of this equation is obtained that allows us to determine the conditions for the vehicles overturning and to investigate the basic parameters of the movement of vehicles in the process of overturning from the moment when the center of mass of the vehicle begins to rise until the moment of its maximum lifting. A comparison of the results of calculating the critical speed of vehicles with results obtained on the basis of the law of energy conservation was carried out. The results are fully agreed. The numerical results obtained using a mathematical model for a particular vehicle have been analyzed.

scholarly journals Mathematical model for estimation the stability of the vehicle's motion on overturning

2021 ◽  
pp. 47-52
Author(s):  
Serhii Povaliaiev ◽  
Olexii Saraiev
Keyword(s):  
Mathematical Model ◽  
Traffic Accidents ◽  
Order Differential Equation ◽  
Road Traffic ◽  
Center Of Mass ◽  
Conservation Of Energy ◽  
The Stability ◽  
The Moment ◽  
The Mathematical Model ◽  
Vehicle Movement

Problem. During the reconstruction of the circumstances of road traffic accidents with vehicles overturning, difficulties arise with determining the parameters of vehicles in the process of their overturning. This is due to the fact that the recommended calculation methods are often simplified. The main focus of such techniques is to determine the minimum speed of vehicles, which leads to their overturning. In fact, the speed of vehicles before overturning can be significantly higher. Goal. This paper is dedicated to developing mathematical model of overturning vehicles that makes possible to determine not only the conditions for overturning vehicles, but also other parameters of the vehicle movement in the process of overturning. Methodology. The overturning of the vehicle occurs as a result of the action of inertial forces after collision with an immovable side obstacle. In this case, the moment from the force of gravity of the vehicle keeps it from overturning. In the process of overturning the vehicle, the moment from the force of gravity decreases due to the decrease in the arm of the force of gravity. To compile a mathematical model, the basic equation of dynamics during rotational motion was used. The mathematical model of a vehicle overturning is written in the form of a nonlinear homogeneous second order differential equation. An analytical solution of this equation is obtained. Results. Developed mathematical model makes possible to determine not only the conditions for overturning vehicles, but also other parameters of the vehicle movement from the moment the center of mass begins to rise to the moment of its maximum rise in the process of overturning. For a particular case, when the critical speed of a vehicle during its overturning is determined, the developed mathematical model fully corresponds to the mathematical model based on the law of conservation of energy. For a specific vehicle, numerical results were obtained that fully correspond to the physics of the overturning process.

TO THE STABILITY OF TANK VEHICLES IN THE BRAKE MODE

2019 ◽  
pp. 27-32
Author(s):  
Denys Popelysh ◽  
Yurii Seluk ◽  
Sergyi Tomchuk
Keyword(s):  
Mathematical Model ◽  
Control Systems ◽  
Distribution Systems ◽  
Traffic Accidents ◽  
Road Traffic ◽  
Center Of Mass ◽  
Dynamic Processes ◽  
Course Stability ◽  
The Stability ◽  
Tank Vehicles

This article discusses the question of the possibility of improving the roll stability of partially filled tank vehicles while braking. We consider the dangers associated with partially filled tank vehicles. We give examples of the severe consequences of road traffic accidents that have occurred with tank vehicles carrying dangerous goods. We conducted an analysis of the dynamic processes of fluid flow in the tank and their influence on the basic parameters of the stability of vehicle. When transporting a partially filled tank due to the comparability of the mass of the empty tank with the mass of the fluid being transported, the dynamic qualities of the vehicle change so that they differ significantly from the dynamic characteristics of other vehicles. Due to large displacements of the center of mass of cargo in the tank there are additional loads that act vehicle and significantly reduce the course stability and the drivability. We consider the dynamics of liquid sloshing in moving containers, and give examples of building a mechanical model of an oscillating fluid in a tank and a mathematical model of a vehicle with a tank. We also considered the method of improving the vehicle’s stability, which is based on the prediction of the moment of action and the nature of the dynamic processes of liquid cargo and the implementation of preventive actions by executive mechanisms. Modern automated control systems (anti-lock brake system, anti-slip control systems, stabilization systems, braking forces distribution systems, floor level systems, etc.) use a certain list of elements for collecting necessary parameters and actuators for their work. This gives the ability to influence the course stability properties without interfering with the design of the vehicle only by making changes to the software of these systems. Keywords: tank vehicle, roll stability, mathematical model, vehicle control systems.

scholarly journals EXPERT APPROACH WHEN RESEARCHING CAUSES OF TRAMWAYS COMING-OFF FROM RAIL TRACKS (TURNOUTS)

2017 ◽  
Vol 17 ◽  
pp. 313-318
Author(s):  
P N. Khorobryh ◽  
A. О. Kazarov ◽  
V. O. Labintsev
Keyword(s):  
Road Traffic Accident ◽  
Traffic Accident ◽  
Traffic Accidents ◽  
Road Traffic ◽  
Point Of View ◽  
Road Traffic Accidents ◽  
Technical Point ◽  
Automatic Mode ◽  
The Moment ◽  
The One

During investigation of road-traffic accidents with tramways participation, investigative bodies are interested in the causes which, from the technical point of view, could lead to coming-off of a tram from rails. In the paper the case in which two drivers of separate tram cars took part, is considered. Circumstances of road traffic accident consist in the following. During transit of the first tram through automated turnout in the moment when the first bogie of the first tram has already proceeded the switch, and the second has not yet, there was shift of a point rail, that is, there was a shift of rail for the movement in other direction. As a result of it the first bogie of the first tram has continued movement in the same direction, and the second bogi has started to move in another direction. In other words there has occurred turnout incut. In order to check operation of a turnout, various modes of its operation were simulated. Also experimental transits of tram cars were carried out. The obtained data has allowed to draw up a conclusion that the cause of the first tram coming-off from rails was a technical malfunction switch and coincidence of certain circumstances. That is, on the one hand, automatic moving ofpoint switch occurred only for tram movement to the left. On the other hand, the reason of the first tram descent from a railway was that the driver of the second tram has passed entrance harp during the moment when the first tram still was in a pass stage of switch. In article the algorithm of the specialist actions in a similar situation during carrying out of investigatory experiment is resulted and the list of questions solved at carrying out of switch researches, which works in an automatic mode at the moment of traffic accident occurrence is stated.

scholarly journals Mathematical model of road traffic accident development using the system analysis theory

2021 ◽  
pp. 136-143
Author(s):  
Alexander Gusev ◽  
◽  
Innesa Rutkovskaya ◽  
Alla Gerasimenko ◽  
◽  
...  
Keyword(s):  
System Theory ◽  
Mathematical Model ◽  
Road Traffic Accident ◽  
Traffic Accident ◽  
Traffic Accidents ◽  
System Analysis ◽  
Road Traffic ◽  
Road Traffic Accidents ◽  
The Road ◽  
Analysis Theory

The article describes the principles and algorithms for creating a mathematical model of the road traffic accidents on the highway section using system analysis theory and queuing system theory.

scholarly journals Use of prehospital, hospitalization and presence of sequelae and/or disability in road traffic injury victims in Brazil

PLoS ONE ◽  
2021 ◽  
Vol 16 (4) ◽  
pp. e0249895
Author(s):  
Gabriela Camargo Tobias ◽  
Polyana Maria Pimenta Mandacarú ◽  
Rafael Alves Guimarães ◽  
Otaliba Libânio Morais Neto
Keyword(s):  
Road Traffic Accident ◽  
Traffic Accident ◽  
Traffic Accidents ◽  
Road Traffic ◽  
Prehospital Care ◽  
Road Traffic Accidents ◽  
Factors Associated ◽  
The Road ◽  
Care Services ◽  
The Moment

Objective To estimate the prevalence and analyze the association between sociodemographic and behavioral variables with the use of prehospital care, hospitalization and sequelae and/or disability in victims of road traffic accidents victims in Brazil. Methods Data from the National Health Survey conducted in 2013 in Brazil were used. Data were collected through a direct household survey. The research sample consisted of 1,840 individuals who reported road traffic accidents in the previous 12 months. Poisson regression analysis was used to evaluate the factors associated with the use of prehospital care services, hospitalization, and the presence of sequelae and/or disability. Results The prevalence of road traffic accidents victims who received prehospital care was 13.0% (95% Confidence Interval [95% CI]: 10.3–16.3) and the factors associated with this outcome were: residing in the Northeast or North region of Brazil; residing in rural areas; and being a motorcycle occupant at the moment of the road traffic accident. The frequency of hospitalization was 7.7% (95% CI: 6.0–10.0) and the associated factors were: age between 40 and 59 years; being a motorcycle occupant or pedestrian and having received on-site care at the moment of the road traffic accident. The prevalence of sequelae and/or disability was 15.1% (95% CI: 12.5–18.2) and the associated factors were: age range between 30 and 39 years or 40 and 59 years; being a motorcycle occupant, being a pedestrian or belonging to other category of modes of transport and having received on-site care at the moment of the road traffic accident. Conclusion The study allowed to evaluate the factors associated with prehospital care, hospitalization and presence of sequelae and/or disability in the victims of road traffic accident and the results can guide the implementation of interventions that prioritize the population exposed to the highest risk of road traffic accident injuries and with less access to prehospital and hospital care services in Brazil.

scholarly journals MATHEMATICAL SIMULATION OF THE CORRELATION BETWEEN THE FREQUENCY OF ROAD TRAFFIC ACCIDENTS AND DRIVING EXPERIENCE

Transport ◽  
2010 ◽  
Vol 25 (3) ◽  
pp. 237-243 ◽  
Author(s):  
Paulius Miškinis ◽  
Vaida Valuntaitė
Keyword(s):  
Mathematical Model ◽  
Statistical Analysis ◽  
Traffic Accidents ◽  
Road Traffic ◽  
Road Traffic Accidents ◽  
Road Accidents ◽  
Driving Experience ◽  
The Mathematical Model ◽  
The Eu

Based on statistical analysis indicating the dependence of the number of road traffic accidents on driving experience, a mathematical model of such correlation is offered. The mathematical model has been tested generating a new approximation using the eigenfunctions of the introduced model applied to draw long‐term forecasts for the dependence of the number of potential road accidents on driving experience. Since we have more road traffic accidents per one hundred thousand inhabitants than other EU countries, comprehensive data analysis might also be useful for the EU community.

ADHD is a Risk Factor of Road Crashes: A Purposive Study of Finding Relation between ADHD and Road Traffic Accident in Bangladesh

2018 ◽  
Vol 9 (08) ◽  
pp. 20531-20536
Author(s):  
Nusrat Shamima Nur ◽  
M. S. l. Mullick ◽  
Ahmed Hossain
Keyword(s):  
Risk Factor ◽  
Road Traffic Accident ◽  
Traffic Accident ◽  
Traffic Accidents ◽  
Road Traffic ◽  
Fatality Rate ◽  
Road Traffic Accidents ◽  
Road Crashes ◽  
Road Crash ◽  
Day By Day

Background: In Bangladesh fatality rate due to road traffic accidents is rising sharply day by day. At least 2297 people were killed and 5480 were injured in road traffic accidents within 1st six months of 2017.Whereas in the previous year at 2016 at least 1941 people were killed and 4794 were injured within the 1st six months. No survey has been reported in Bangladesh yet correlating ADHD as a reason of impulsive driving which ends up in a road crash.

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