Simulation Study On The Vehicle Safe Speed At Curve Section Of Highway Based On Trucksim

Since the reform and opening up,China has achieved rapid social economic development,infrastructure construction has been upgraded,and the transport industry developed rapidly.The transport infrastructures is improving gradually and the number of motorist is increasing in recent years.Which has brought convenience and efficiency to people.But on the other hand,we also face some serious problems of traffic safety that caused by these development.The curve section in the road is the hazardous section.So it’s necessary to analyze the causes of accidents at curve section,and the simulated analysis of safe speed of vehicle is also important.These analyses are beneficial to improve the serious situation of traffic safety.Relies on the items of science and technology of national class and the province class,and also based on the dates of accidents that happened at curve section,this thesis analyze the reasons of accidents.Except this,based on the date of the traffic flow and then designated the vehicle model,Using Trucksim software to establish vehicle dynamics model,road scene model and driver control model.The thesis make a simulated research of safe speed of vehicle from several aspects,they are the vehicle load quality,the height of center of gravity of cargo,the laterar and longitudinal offset of the center of gravity,bend radius,ramp turn supperelcvation,and adhesion coefficient of road surface.The study found that with the increase of vehicle load quality,the safe speed of vehicle at curve section decreases,the relation model between safety velocity threshold of vehicle and load quality is a exponential function.With the increase of the height of center of gravity of cargo,the safe speed of vehicle at curve section decreases,the relation model of vehicle safety velocity threshold and center height is linear function.As the center of gravity is shifted toward the medial direction of the bend,the safe speed of vehicle at curve section increases gradually,The relation model of safety velocity threshold of vehicle and the longitudinal migration of the center of gravity is the quadratic function relation;As the center of gravity is shifted toward the rear side of the geometry,the safe speed of vehicle at curve section is basically unchanged,while the center of gravity shifts toward the front side of the geometry.The safe speed of vehicle at curve section increases firstly and then decreases;with the increase of bend radius,the safe speed of vehicle at curve section increases gradually,the relation model of the safe speed of vehicle and bend radius is the power function relation.With the increase of the ramp turn supperelcvation.The safe speed of vehicle at curve section increases gradually,the relation model of the safe speed of vehicle and the ramp turn supperelcvation is the linear function relation;The influence of adhesion coefficient of road surface on the safe speed of vehicle at curve section is more complicated.Finally,an example is given to illustrate the application of the research in engineering in the thesis.