Research On Damping Characteristics And Vehicle Driving Stability Of Auxiliary Deceleration Lane

At present,in order to solve the problem of running out of control of heavy and downhill vehicles,the method of avoiding danger lane is usually adopted,although it can improve the safety of vehicles to a certain extent and prevent accidents.But there are two accidents prone to happen on the dangerous lane,and it is difficult for the out of control vehicle to drive out autonomously,which not only increases the cost but also affects the capacity of the highway.To solve this problem,an auxiliary deceleration lane is put forward.The auxiliary deceleration lane is a lane added to the road side,which is continuously parallel to the main line and used for speeding or out of control vehicles to slow down to the safe speed.In view of the situation of two accidents due to the instability of vehicles running on the escape lane,this paper is based on the auxiliary deceleration lane to study the stability of the vehicle driving after driving out of the lane.At the present stage,the hard pavement tire model does not consider the influence of the soft pavement subsidence deformation.Firstly,this paper establishes an alternative round tire-aggregate interaction model,and takes into account the up and down jumps of the tires,and establishes a nonlinear coupled vehicle dynamic model with eleven degrees of freedom.Secondly,in order to eliminate the influence of air resistance and slope,the damping effect of deceleration lane is studied,and a sliding test is carried out on a near horizontal road in Lanzhou city.Meanwhile,in order to verify the accuracy of the model,a real vehicle test was carried out on the escape lane at K209+400 and K212+800 sections of S308 provincial road,Lanzhou,Gansu.In addition,the design of the current risk Lane lacks standard guidance.In recent years,there have been a lot of accidents due to the unreasonable length of the escape lane that caused the runaway vehicle to run out of the end.In this paper,a calculation model of damping coefficient of packed gravel aggregate is established according to the gravel gravel aggregate with diameter of 5-10 cm at the test section,and its reliability is verified through experiments.Finally,the nonlinear coupling system of aggregate pavement-tire vehicle is built in MATLAB/Simulink and simulation is carried out,and the influence of the subsidence deformation of the tire under the aggregate pavement on the stability of the vehicle is analyzed by simulation.The study of this paper has a certain theoretical reference significance for guiding the calculation model of the damping property of gravel aggregate and the design of auxiliary deceleration lane.