The Analysis of the Key Problems about Traffic Accident Speed Identification Based on Braking Traces

2013 ◽  
Vol 756-759 ◽  
pp. 4752-4757
Author(s):  
Zhi Wei Guan ◽  
Shao Hua Wang ◽  
Wei Qiang Liang ◽  
Ming Feng Zheng ◽  
Lin Wu ◽  
...  
Keyword(s):  
Traffic Accident ◽  
Performance Test ◽  
National Standard ◽  
Test Report ◽  
Actual Case ◽  
Braking Performance ◽  
Braking Distance ◽  
Braking Process ◽  
Judicial Expertise ◽  
Speed Identification

In order to improve the impartiality and objectivity of judicial expertise, the key problems about traffic accident speed identification are analyzed and the speed of vehicle is calculated by using the braking performance test report with reference to the national standard and automobile theory. The automobile dynamics of driver braking process is analyzed, all kinds of key problems such as the braking distance, braking coordination time, braking speed, longitudinal sliding coefficient of adhesion are combined with the braking performance test report, and the method of determining the longitudinal sliding coefficient of adhesion is proposed, the instantaneous velocity before the collision is calculated. Finally, the method is used to calculate the speed of an actual case, and simulated in the software of PC-Crash, the results are consistent, verifying that the speed identification method is correct.

scholarly journals Bicycle braking process

2018 ◽  
Vol 19 (6) ◽  
pp. 115-120
Author(s):  
Robert Kałuża ◽  
Piotr Czech ◽  
Tomasz Figlus ◽  
Piotr Gustof ◽  
Katarzyna Turoń
Keyword(s):  
Traffic Accident ◽  
The State ◽  
Road Accidents ◽  
Traffic Police ◽  
Police Statistics ◽  
Braking Distance ◽  
Braking Process ◽  
Court Practice

As a result of the increase in the number of vehicles traveling on Polish roads, the state of security has changed significantly in recent years. The risk of a collision or traffic accident has increased as a result of increased traffic. Police statistics show that one of the participants in the collision are people who are cycling. In court practice, when dealing with cases relating to road accidents involving bicycles, it is often necessary to determine the behavior of the driver at the time before the event occurred. For this purpose, knowledge about the braking distance achieved or the braking time of the bicycle can be useful. The article presents the results of testing the braking process of various types of brake systems and bicycles.

Simulation Calculation of the Braking Performance of Portal Cranes Based on ADAMS

2013 ◽  
Vol 690-693 ◽  
pp. 2762-2766 ◽  
Author(s):  
Jing Bo Hu ◽  
Hui Zou ◽  
Yue Gui Feng ◽  
Hui Jin ◽  
Xiao Ling Wu
Keyword(s):  
Safety Management ◽  
Simulation Software ◽  
Braking Performance ◽  
Mechanism Model ◽  
Operation Conditions ◽  
Simulation Calculation ◽  
Braking Torque ◽  
Braking Distance ◽  
Braking Process ◽  
Portal Crane

The braking performance of open-air crane is essential to safety. Taking 40t Portal crane as the study object, this paper first analyzed and calculated the braking torque of traveling mechanism according to the design rules for cranes. Then the portal crane traveling mechanism model was established by the use of simulation software ADAMS, the braking process of crane of constant wind load was studied on typical operation conditions, and its braking performances were comparative analyzed. Finally, it can be concluded that it will substantially increase the crane braking time and braking distance after braking torque is adjusted small and cause hidden troubles of accident. The analytical method and conclusions of this paper can provide a theoretical basis to crane safety management.

scholarly journals Research on the Anti-Disturbance Control Method of Brake-by-Wire Unit for Electric Vehicles

2019 ◽  
Vol 10 (2) ◽  
pp. 44 ◽  
Author(s):  
Gong ◽  
Qian ◽  
Ge ◽  
Wang
Keyword(s):  
Electric Vehicles ◽  
Control Method ◽  
Robust Performance ◽  
Braking Performance ◽  
Vehicle Simulation ◽  
Braking Distance ◽  
Simulation Results ◽  
Braking Force ◽  
Electro Magnetic ◽  
Braking Process

In order to improve the braking performance of electric vehicles, a novel brake-by-wire actuator based on an electro-magnetic linear motor was designed and manufactured. For the purpose of braking force regulation accuracy and high robust performance, the state observer and the anti-disturbance controller were designed in this paper after describing the actuator structure, braking principle, and mathematical model. The simulation and experimental results showed that the brake actuator responded rapidly, since its response time was only 15 ms. Compared to traditional PID (Proportion Integration Differentiation) methods, the controller proposed in this paper is able to regulate the braking force more precisely and has better anti-disturbance performance, thus the braking process can be accurately controlled according to the driver’s demand. The vehicle simulation results showed that the braking distance and braking time were shortened by 12.19% and 15.54%, respectively compared with those of the conventional anti-lock brake system (ABS) in the same braking conditions.

The Analysis and Research of Traffic Accident Velocity Based on C#

2014 ◽  
Vol 505-506 ◽  
pp. 1137-1142
Author(s):  
Li Lin ◽  
Ting Ting Lv
Keyword(s):  
Traffic Accident ◽  
Traffic Accidents ◽  
Front Face ◽  
Vehicle Speed ◽  
Application Range ◽  
Collision Type ◽  
Side Collision ◽  
Speed Identification ◽  
Important Basis ◽  
Collision Angle

In the process of the traffic accidents confirmation, the identification of vehicle speed when accident occurred is often an important basis for accident confirmation. The paper firstly discusses the models of mechanics and solving method for the vehicle front face, rear end, sides face ,slanted side collision based on the theory of collision mechanics ,it describes how to identify the vehicle rate and collision angle based on the model simplification, the theoretical analysis for dealing with the complicated accidents. The common and formulas are studied based on the classical collision mechanics method. The application range, parameters involved in selection and influence of the formulas are analyzed in detail. Finally the program based on C# is developed according to the identified calculation process for vehicle speed of traffic accident. The vehicle speed is obtained by selecting the collision type, entering the relevant accident pattern, inputting the parameters and clicking the command button .The application can store, modify and display results conveniently , improve efficiency on vehicle speed identification effectively and reduce the processing cycle of traffic accident availably.

Truck braking distance and speed estimates

1986 ◽  
Vol 13 (4) ◽  
pp. 412-422 ◽  
Author(s):  
Francis P. D. Navin
Keyword(s):  
Traffic Accident ◽  
Centre Of Mass ◽  
Average Ability ◽  
Sight Distance ◽  
Truck Accidents ◽  
Police Agencies ◽  
Braking Distance ◽  
Stopping Sight Distance ◽  
Basic Equations ◽  
Final Equation

The most frequently cited cause of truck accidents is “speed too fast for prevailing conditions.” To cite this cause, a speed estimate is necessary. This paper shows the factors that should be considered. The factors most useful in estimating a truck's braking capability include vehicle configuration, loading, location of the centre of mass, and axles with brakes. The exact value of some of the variables is difficult to obtain.The formulation proposed in this paper builds on a simple and effective procedure used by police agencies to estimate speed from skid marks. The formula given by R. Rivers' “Traffic accident investigator's handbook” is formalized and the elements in his correction factor N are derived. Basic equations for the braking of straight trucks and combinations are derived. The difficulty of implementing the equations in practice for all but the simplest situation is obvious from the complexity of the equations. A lumping of all the parameters into a simplified form is developed based on truck stopping distances obtained from published experimental data. All the trucks in the data had well-adjusted brakes. The final equation to estimate speed from a truck's skid marks accounts for the average ability of such vehicles to stop as well as the variance in stopping ability. Key words: truck braking, braking efficiency, stopping sight distance, skid marks.

Vehicle Hydraulic Brake Energy Storage System Design

2013 ◽  
Vol 281 ◽  
pp. 197-200
Author(s):  
Yu Bao Zhang ◽  
Meng Jin
Keyword(s):  
System Design ◽  
Storage System ◽  
Energy Storage System ◽  
Simple Description ◽  
Braking Performance ◽  
Parameter Calculation ◽  
Hydraulic Hybrid ◽  
Scope Of Application ◽  
Braking Process ◽  
Hydraulic System Design

Simple description the background of hydraulic hybrid technology, scope of application. Put forward the idea of hybrid hydraulic system design based on the car's braking performance, the main elements parameter calculation. Simulation results show that the braking process is smooth, brake energy recovery, the system design and parameter calculation of reasonable.

The Analysis between Two Different Methods of Power Plant Boiler Thermal Efficiency

2014 ◽  
Vol 536-537 ◽  
pp. 1578-1582 ◽  
Author(s):  
Po Li ◽  
Cheng Wei Zhang
Keyword(s):  
Power Plant ◽  
Thermal Efficiency ◽  
Power Plants ◽  
Performance Test ◽  
Thermal Power ◽  
National Standard ◽  
Test Procedures ◽  
Excess Air ◽  
Power Plant Boiler ◽  
Plant Boiler

The power plant boiler is one of the most important facilities in thermal power plants. The thermal efficiency of power plant boilers is the index. This paper discusses the relationship between the boiler thermal efficiency and the coefficient of excess air via two methods, one is called the simplified calculating formula and the other is the calculating formula according to the The People's Republic of China national standard power plant boiler performance test procedures. According to the proposed methods, by solving the same optimal problem, optimum excess air coefficients are obtained. Then a comparative analysis is given. Moreover, an improved way for saving calculation time to get the coefficients of the mixed coal in the so called simplified calculating formula is developed.

An Investigation on Speedometer Pointer Residual-Value of Crashing Vehicle and its Application in Accident Reconstruction

2012 ◽  
Vol 152-154 ◽  
pp. 1177-1182
Author(s):  
Yuan Quan ◽  
Xiao Qi Chen ◽  
Yi Bing Li
Keyword(s):  
Traffic Accident ◽  
Effective Means ◽  
Research Work ◽  
Accident Reconstruction ◽  
Vehicle Speed ◽  
Damage And Failure ◽  
Vehicle Collision ◽  
Vehicle Impact ◽  
Speed Identification ◽  
Real Traffic

According to the experience of traffic accident investigation over the years, the pointer of some crashed vehicles’ speedometer will stay in one place because of collision spread or heavily vibration, which may indicate the vehicle collision speed. However, the correlation between the residual speed value and actual vehicle collision speed still remains to be examined. For the practical needs of traffic accident reconstruction, this research work is carried out. Based on the principles of traditional speedometers, vehicle impact mechanics and failure mechanism, the damage and failure mode of speedometer in collision are studied. Through the statistics of 15 real traffic accident cases, the features and law about the pointer information of damaged speedometers are obtained initially. As an example, one of these cases is analyzed and calculated to verify the assumption. The availability of the mark information on the indicated place of speedometer after accidents (i.e. the correlation between the speed value of pointers and actual vehicle collision speed) is discussed, which can provide effective means and references for accident reconstruction and vehicle speed identification.

Sprung Mass Motion Emulation in a Braking Test Rig

2015 ◽  
Author(s):  
Chunjian Wang ◽  
Qian Wang ◽  
Jeffery Anderson ◽  
Beshah Ayalew
Keyword(s):  
Load Transfer ◽  
Mass Motion ◽  
Test Rig ◽  
Braking Performance ◽  
Braking System ◽  
Control Scheme ◽  
Electromagnetic Linear Actuator ◽  
Braking Process ◽  
The Stability ◽  
Actuator Control

This paper describes a quarter-car braking test rig that includes a hardware-in-the-loop (HIL) means for emulating broader vehicle dynamic effects. The test rig utilizes actual vehicle components such as the suspension-tire assembly and braking system to accurately represent a vehicle during a braking event and a chassis dynamometer’s drum is used to simulate the longitudinal vehicle dynamics. The key problem addressed in this paper is the emulation of sprung mass motion with a commercial electromagnetic linear actuator. By accurately representing the motion, detailed effects such as load transfer that happens in a real braking process can be studied for its effect on the braking performance. The stability of the system with sprung mass emulation under different actuator control modes is analyzed. The successful and stable control scheme found is a cascaded control with a velocity tracking strategy. The workings of the test are illustrated via representative test results that include a locked-wheel braking event and a stop with an anti-lock braking system (ABS).

scholarly journals A New Model of Stopping Sight Distance of Curve Braking Based on Vehicle Dynamics

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Rong-xia Xia ◽  
De-hua Wu ◽  
Jie He ◽  
Ya Liu ◽  
Deng-feng Shi
Keyword(s):  
Calculation Model ◽  
Emergency Situations ◽  
Process Dynamics ◽  
Sight Distance ◽  
Straight Line ◽  
Braking Distance ◽  
Vehicle Test ◽  
Stopping Sight Distance ◽  
Braking Process ◽  
Experimental Values

Compared with straight-line braking, cornering brake has longer braking distance and poorer stability. Therefore, drivers are more prone to making mistakes. The braking process and the dynamics of vehicles in emergency situations on curves were analyzed. A biaxial four-wheel vehicle was simplified to a single model. Considering the braking process, dynamics, force distribution, and stability, a stopping sight distance of the curve braking calculation model was built. Then a driver-vehicle-road simulation platform was built using multibody dynamic software. The vehicle test of brake-in-turn was realized in this platform. The comparison of experimental and calculated values verified the reliability of the computational model. Eventually, the experimental values and calculated values were compared with the stopping sight distance recommended by the Highway Route Design Specification (JTGD20-2006); the current specification of stopping sight distance does not apply to cornering brake sight distance requirements. In this paper, the general values and limits of the curve stopping sight distance are presented.

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