Analysis of Factors Affecting the Comfort of Vehicle Occupants Due to Bridgehead Jumping

In order to study the influence of bumping at bridge head on the comfort of vehicle occupants, this paper comprehensively considers the factors such as bridge head drop, driving speed and road horizontal and vertical alignment, and uses Carsim vehicle dynamics simulation software to establish the test road and vehicle model. On this basis, combined with the design experiment of various influencing factors, the four conditions are simulated, and the longitudinal acceleration interference is proposed as the evaluation index. The influence of various factors on the comfort of vehicle occupants in the bridgehead jump section is analyzed, and on this basis, the evaluation effect of the maximum longitudinal acceleration and longitudinal acceleration interference on the comfort of vehicle occupants is compared. The results show that the bridge head drop, vehicle speed and longitudinal slope have obvious influence on occupant comfort, while the curve radius has no obvious influence on occupant comfort. The longitudinal acceleration increases with the increase of bridge head drop and driving speed. The steeper the longitudinal slope of the uphill section is, and the lower the longitudinal acceleration is, the steeper the longitudinal slope of the downhill section is, and the higher the longitudinal acceleration is. When the bridge head drop is greater than 20 mm and the vehicle speed is greater than 100 km/h, the comfort is relatively poor; When the bridge head is located on the uphill section, the influence on comfort is smaller than that on the downhill section. In addition, the maximum longitudinal acceleration and longitudinal acceleration interference can effectively evaluate the comfort of the occupant, and the longitudinal acceleration interference can more effectively guide the actual work. Therefore, in the prevention and control of the impact of vehicle bump at bridgehead on the comfort of passengers, the design stage can adopt the method of controlling the longitudinal slope size, setting the bridgehead at the uphill section, and the operation stage can adopt the method of section speed limit to improve the driving comfort of the section.