Design And Implementation Of Operating Safety Ensuring Model In Hengduan Mountainous Expressway

Hengduan mountainous expressway is located in Hengduan mountainous with complexlandform,which have special sections (long-descent,sharp turn,and so on). Traffic accidentusually happens in Hengduan mountainous expressway. It is urgent need to study on operatingsafety of Hengduan mountainous expressway. The main reasons are drivers' over-speeding,vehicle's braking inefficacy and vehicle rollover. Therefore,it is important to research on themethod of ensuring the special sections,analyse the induced mechanism of potential accidentsin special sections,design safety ensuring measures from the harmony of combined operationof DVR(Driver-Vehicle-Road and environment).Against the design and implementation of operating safety evaluation model inHengduan mountainous expressway,this dissertation studies on the virtual testing method ofexpressway alignment and driving speed,designs the active safety measures,passive safetymeasures,also applies the virtual testing system and safety evaluation system to the actualHengduan mountainous expressway project.(1)This dissertation studies on the testing method of highway alignment safety based onthe braking stability and turning stability. Through the analysis of typical vehicle braking(car,two-axis vehicle,three-axis vehicle) and the research mathematically on temperaturerising status of brake,the decrease of the friction coefficient of brake friction pairs,thedecrease of braking efficiency,this dissertation studies on the testing method of Hengduanmountainous expressway with braking stability. Through the analysis of turning stability inHengduan mountainous expressway,this dissertation studies on the testing method ofHengduan mountainous expressway with turning stability using 9-DOF vehicle dynamicmodel and Gim theoretic model of pneumatic tyres.(2)This dissertation appraises the rationality of parameters design of Hengduanmountainous expressway from the drivers' visual characteristics,and studies on the divingspeed testing model of Hengduan mountainous expressway. Through the test design ofdrivers' visual characteristics,this dissertation studies on drivers' visual characteristics ofHengduan mountainous expressway using eye-movement facilities and vehicle experiment.Through the analysis of speed control status,this dissertation studies on the speed predictionof typical vehicle (car,two-axis vehicle,three-axis vehicle) in Hengduan mountainousexpressway using maths tools. (3)This dissertation designs operating safety ensuring. According to design principles ofcompulsive speed-control device,this dissertation studies on active safety system from theharmony of combined operation of DVR.Against the hidden safety deficiencies of Hengduanmountainous expressway,this dissertation studies on passive safety system.(4)This dissertation studies on the implementation of virtual testing system and safetyensuring system. According to Baolong expressway,this dissertation studies on the virtualtesting of Baolong expressway operating safety,and designs the active safety measures,passive safety measures of Baolong expressway.In general,the key points of innovation in this dissertation mainly rest in the followingaspects:(1)Based on the dynamic modeling of braking stability and turning stability,thisdissertation sets up the testing model of the decrease of braking efficiency and drivingstability to evaluate the alignment of Hengduan mountainous expressway.(2)This dissertation studies on the alignment parameter of Hengduan mountainousexpressway from the drivers' visual characteristics using vehicle experiment,and sets upalignment parameter evaluation model which can harmonize to the drivers' visualcharacteristics.(3)This dissertation sets up speed prediction model of typical vehicle(car,two-axisvehicle,three-axis vehicle) in Hengduan mountainous expressway.(4)This dissertation builds the active safety measures and passive safety measures ofHengduan mountainous expressway from the harmony of combined operation of DVR.