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Our country roadside transportation accident rate is very high, the reason is the inadequate roadside clear zone distance. In order to improve our country's roadside traffic condition, considering the existing road standard's foundation, the domestic and foreign roadside width researches, using the analysis and contrast the method, in view of our country roadside's actual situation, we get the roadside...
In order to improve the safety of opening traffic under overpass bridge, on account of the accidents characteristic which occurs under overpass bridge, refer to the related national standards of traffic safety facilities designation, the research was made from the standpoint of induction from the line of sight, warning signs and markings and barrier protection, and the corresponding solutions were...
Based on the frequency and severity of the collision accident of overpass bridge and superelevation vehicle, in order to improve the safety of the opening traffic under the overpass bridge, through the research for the overall dimension limiting value of vehicles used on the road, refer to the foreign setting value of the headroom clearance on the road and under bridge as well, according to the feature...
In the traffic information collection, Multi-sensor can be achieved in time and space information complementary. How to extract and process the discrete data effectively, become an important issue on multi-sensor comprehensive information collection. Based on the principle that same traffic conditions lead to similar traffic status, we present a new multi-sensor detection method for traffic flow by...
The paper presents a new type of wire rope safety barrier, which has many posts with C-shaped cross section and 5 ropes, by way of designing the shape of the post, the diameter of the rope, the arrangement and the number of ropes etc., on the basis of the form of structure of the most advanced foreign existing wire rope safety barrier — BRIFEN. And in order to realize that the barrier is designed...
In order to enhance the anti-collision capacity of the vehicle, the key technologies of the vehicle automatic anti-collision new concept safety system has been raised, to analyze the contact-impact mechanical properties of CST, and to study CST electric controlling system which be triggered at the safety state to the braking system, and then through the prototype debugging, a anticipative effect had...
In order to solve the inverse identification problem of material dynamic constitutive parameters while cutting the thread, and obtain the parameters which can describe the material dynamic mechanical properties correctly. The MSARS algorithm was adopted in this paper, and by the use of this algorithm, a Johnson-Cook model parameters inverse identification research which used known thread material...
In order to solve the safety problem of different grades roads and crashworthy capacity of overpass design, to meet the traffic safety requirements under different conditions, by using similar principle, several overpass crashworthy barrier in different levels had been gotten here, and had been proved to have better adaptability. In preliminary work, the optimum structure parameter of SH overpass...
Based on traffic specification, the characteristics of traffic accidents on highway Overpass Bridge and current security situation associated, a new barrier has been developed to satisfy the requirement to endure the crash from large truck. To obtain the optimal structural parameters of barrier, an orthogonal method is applied to determine the vehicle- crash to barrier model that enables the simulation...
To satisfy Collision safety requirements formuled by both FMVSS208 and ECE R94 for vehicles fixing CST, take metro as the research object, which mass is 0.8 tons, using universal principles of particle kinematics and dynamics, and obtain the CST-ideal energy absorption curve which can satisfy both FMVSS208 and ECE R94. To make sure that the designed CST can obtain ideal energy absorption curve, having...
To make the crank slider protective devices to meet the requirements of regulation, optimization was carried out to the absorbing thread of the crank-slider-CST protective device. Based on the finite element model in VPG and simulation in LS-DYNA, with the orthogonal optimization design, obtained the parameters of the absorbing thread. The crash speed in these simulations is 50km/h, which is higher...
With the crank-slider mechanism, applied the principle of Cutting the screw thread(CST) to the low rear protective device of truck, devised a new type of device which supplied a new solution for the crash incompatibility. Firstly, according to the dimension of certain type of Foton light-duty truck and the requirement of regulation, took the maximum transmission angle as optimized object, with the...
To reduce the quality of Cutting the Screw Thread and maintain the ability of absorption, optimize the size of thread pipe which is one of large quality parts of Cutting the Screw Thread by stress analysis and the ideal of topology optimize. Then lightweight design is done to impact bar which is another large quality parts of Cutting the Screw Thread by using lightweight material and optimizing size...
To improve the self-protection capability of automobile, comprehensively analyze the related safety factors, detect the real-time status of the factors while driving by using sensor technique, and then judge the real-time security level. Based on it, a real-time protective barrier system for automobile safety can be established, which can execute corresponding actions and avoid danger automatically,...
To further study the crank-slider-CST protective device, the finite element models of car and truck with different kinds of low rear protective devices were built in VPG firstly. Then the full width rear-end crash simulation at the speed of 32Km/h was carried out in LS-DYNA. Finally, compared the acceleration, rebound velocity and inserting displacement of the front axis of the car. The simulation...
To improve the safety protection capability of automobile while driving, and better to play the role of CST in protecting automobile, aiming at some factors affecting road safety, and combined with the design requirements of control system, the article researched the judge method about driving safety level, human-computer interaction response alerts and emergency measures. And by using cooperative...
CST is a new kind of vehicle passive safety device. In order to study the difference of CST for different weight vehicles, UG, VPG, LS-DYNA would be used to simulate and calculate, and it showed that influence of vehicle weight on CST shear fracture and blunt edge roundness is very great, this could provide a strong foundation for the study of CST on different vehicles, and also has great reference...
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