Optimization Of Urban Underpass Tunnel Space Structure Based On Driver's Physiological Characteristics And Behaviors

In recent years,in order to slow down urban traffic congestion and improve road traffic capacity,more and more tunnel tunnels have appeared in the road junctions of large cities.However,when the vehicle passes through the urban underpass tunnel quickly,the upper and lower slope of the entry and exit and the semi closed tunnel structure cause psychological stress to the driver,and affect the traffic safety.Therefore,combined with ergonomics,this paper analyzes the changes of physiological characteristics and behaviors of drivers under different combinations of structural parameters under urban driving,and explores the optimal combination of spatial parameters of urban underpass tunnel.This thesis selected three parameters as the object,such as the tunnel height,slope and the length of slope.designed the experimental scenarios of driving simulator according to HintCAD,3DMAX,SCANeR^TM studio and other software.Finally,30drivers'ECG,speed,Lane shift and other information were collected.The three-dimensional function is constructed by using Origin software.The three-dimensional relationship between driving heart rate,RR interval,speed of uphill and downhill,and lane shift of uphill and downhill with slope length and slope is analyzed in detail at different tunnel heights.The regression relationship between the variables is fitted by SPSS,and the optimal combination of the spatial structure parameters of the tunnel under the tunnel is finally determined.The results show that the tunnel height and slope significantly affect the driver's heart rate and RR interval,the tunnel height is increased,the heart rate decreased,RR interval value is slightly increased;increase from 3%to 6%near the slope,the heart rate increases,RR interval decreases,but when the slope is higher than 6%,the driver's heart rate and the RR interval tends to be stable when the tunnel slope height is more than 4m,not more than 4%,the driver's heart rate with the increase of slope length decreases.In addition,when the slope increases,the speed of the lower slope decreases first and then increases,while the speed of the upper slope decreases continuously.The driveway migration in the upper and lower slope increases with the increase of the slope,and decreases slightly with the increase of the height of the tunnel.Finally,from the 125 city tunnel parameters selected 30 groups of optimal combination,at the same time,according to the threshold range of each variable,the237 groups to determine the optimal parameters to meet the conditions of the tunnel,the height is between 3.6 to 4.4m,the slope length ranged from 60 to 180m,the slope between 1.4%and 5.4%.