Abstract
The study in this paper aims to evaluate the effects of vehicle-bridge coupled vibration on the vehicle ride comfort. The mechanical model of both vehicle and bridge subsystems and the vibration differential equations are established, respectively, based on the principle of dynamic balance and finite element method. The APDL command stream for iterative calculation is compiled on the ANSYS platform. The method to evaluate the vehicle ride comfort is established according to the criteria in ISO2631-1-1997. The vehicle dynamic responses and ride comfort are analyzed considering different pavement levels while multiple vehicles pass through the cable-stayed bridge. The analysis results indicate that the dynamic responses of vehicles decrease with the improvement of pavement roughness, resulting in the vehicle ride comfort to be better; the dynamic responses of vehicles increase with the increment of vehicle speed or the decrement of vehicle gravity, resulting in the vehicle ride comfort to be worse. The present research results can provide an insight into the rational design of bridge structure so as to reduce the vehicle-bridge coupling vibration responses and improve the ride quality of drivers and passengers.
Highlights
E above researches focused on the dynamic responses of bridge structure; they did not discuss the vehicle dynamic responses and vehicle comfort
The coupling vibration of most vehicle-bridge systems cannot lead to an obvious threat to the safety of bridge structure and the vehicles, the vibration of vehicle-bridge systems may be very strong and the vehicle ride comfort is very poor from the perspective of drivers and conductors
The vehicle-bridge model was established by ANSYS APDL, and iso2631-1-1997 evaluation standard was used to analyze the vertical acceleration, pitch acceleration, and roll acceleration of vehicles under different bridge deck grades, vehicle speed, and vehicle weight, so as to study the influence of bridge deck roughness, vehicle speed, and vehicle weight on vehicle body comfort
Summary
When vehicles pass through a long-span bridge, the dynamic interaction between vehicles and bridge often occurs due to the roughness of road surface. is phenomenon is called vehicle-bridge coupling vibration and is usually affected by vehicle running parameters. e research on this subject includes the analysis of dynamic responses of bridge structure, running stability, and vehicle ride comfort.e main difficulty is that the interaction between the two subsystems cannot be determined by a simple method.erefore, it is necessary to establish the dynamic model and the dynamic interaction model of vehicles and bridge. e road roughness needs to be described mathematically, and the vibration differential equations of the system should be established. e solution to the problem should be obtained by numerical method [1,2,3,4].e structure of the paper is arranged as follows. e concepts of vehicle-bridge coupling vibration and vehicle ride comfort are introduced in the first part. When vehicles pass through a long-span bridge, the dynamic interaction between vehicles and bridge often occurs due to the roughness of road surface. Is phenomenon is called vehicle-bridge coupling vibration and is usually affected by vehicle running parameters. E research on this subject includes the analysis of dynamic responses of bridge structure, running stability, and vehicle ride comfort. E road roughness needs to be described mathematically, and the vibration differential equations of the system should be established. E concepts of vehicle-bridge coupling vibration and vehicle ride comfort are introduced in the first part. The analysis method is introduced, including establishing the model of vehicle-bridge coupling vibration, the differential equations of vehicle-bridge system and solution, and the vehicle comfort analysis method.
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