Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (3): 736-748.doi: 10.13229/j.cnki.jdxbgxb20180074

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Cross-wind environment vehicle driving feature at canyon bridge and tunnel connection segment

Lu WANG(),Yu⁃wen LIU,Hong CHEN   

  1. School of Highway, Chang'an University, Xi'an 710064, China
  • Received:2018-01-23 Online:2019-05-01 Published:2019-07-12

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Abstract:

In order to solve the problem of highway traffic safety in the mountainous area, vehicle transient aerodynamic feature and its laws in bridge and tunnel connecting segment affected by the wind environment are studied. With the help of Carsim software, the vehicle model and the road model are built to simulate the feature of the vehicle and road in bridge and tunnel connecting segment. The measured varying wind speed of Xihan Expressway is input to simulate the average wind and fluctuating wind of the natural wind load, and the influence of wind angle on the vehicles is researched. Firstly, after simulation, the parameters, such as vehicle longitudinal speed, lateral acceleration, aerodynamic force(drag force, side force and lift force) and aerodynamic slip angle are analyzed. Then, the influences of the vehicle aerodynamic forces of different vehicle speeds, wind speeds and wind directions on the driving stability are analyzed. Finally, the critical vehicle speed and critical wind speed of safe and stable driving in the side wind environment are investigated. Research results show that, when the vehicle speed is increased from 60 km/h to 80 km/h, the drag force, side force and lift force are increased by 160%, 53% and 89% respectively. Under the snow and ice surface with wind speed of 80km/h, a large offset of more than one meter occurs. When the maximum wind speed of Xihan Expressway was 31.5 m/s (about 113 km/h), the vehicle will obviously overturn and it will be a risk to driving safety.

Key words: engineering of communications and transportation safety, aerodynamic feature of vehicle, CARSIM, bridge and tunnel connecting segment, canyon wind

CLC Number: 

  • U491

Fig. 1

Car external flow"

Fig. 2

Pneumatic six?component force of an automobile"

Table 1

Main parameters of vehicle"

参 数 数 值
车长/mm 4501
车宽/mm 1704
车高/mm 1469
轴距/mm 2604
前轴距/mm 1540
质心高度/mm 540
簧上质量/kg 1140

Fig. 3

Parameters of car"

Fig. 4

Setting of relevant parameters of road model"

Fig. 5

Wind speed data setting interface"

Fig. 6

Flow chart of Carsim simulation"

Fig. 7

Temporal and spatial variation of evaluation index"

Fig. 8

Variation diagram of aerodynamic coefficient"

Fig. 9

Aerodynamic force variation with different speeds"

Fig. 10

Aerodynamic force with different maximum wind speeds"

Fig. 11

Aerodynamic force at different winddirection angles"

Fig. 12

Comparative curve of vehicle lateral forcecoefficient change"

Fig. 13

Comparative curve of vehicle resistancecoefficient change"

Table 2

Annual maximum wind speed at stations"

站号 站名 极大风速值/（m·s?1）

V0004

V0005

V0006

户县安检站

秦岭安检站

宁陕

29.5

31.5

30.7

Fig. 14

Lateral offset of ice and snow pavement under influence of vehicle speed"

Table 3

LTR value of dry pavement under"

各项指标 风速/(km·h?1)
70 80 90 100

风作用外侧

垂直载荷/N

 5712 6156 7538 8815

风作用内侧

垂直载荷/N

 1937 1476 325 0
LTR值 0.49 0.61 0.92 1.00

Fig. 15

Lateral offset of ice and snow pavement under influence of wind speed"

Fig. 16

Vehicle driving condition when maximum wind speed reaches 100 km/h"

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