SIMULATION OF DAMAGE EVOLUTION IN A （模拟的损伤演化）.pdfVIP

SIMULATION OF DAMAGE EVOLUTION IN A SPRAY SEALED ROAD M. Costanzi, D. Cebon Engineering Department, University of Cambridge, England Presenter: M. Costanzi Research Student Engineering Department, Trumpington St., Cambridge, England, CB2 1PZ +44 01223 766320 mc414@eng.cam.ac.uk ABSTRACT In Australia, heavy vehicles with ‘road-friendly’ suspensions are allowed higher static axle loads (‘Higher Mass Limits’ – HML), based on a type-approval test, performed on new vehicles. The ‘Road Friendliness’ regulation does not have any requirement for suspensions to retain their road-friendliness in-service. To pass the road-friendliness test, an air suspension needs to have fully-functioning hydraulic shock absorbers. These components wear with time, which reduces the damping level of the suspensions and can result in a substantial increase in the dynamic tyre forces. The question addressed in this paper is whether this poor suspension performance, when taken over the entire heavy vehicle fleet, will cause a significant increase in the maintenance costs of Australian roads. The approach of the study is: (i) to develop a mathematical model of the interaction between a fleet of heavy vehicles and the road surface; (ii) to validate the model using road performance data; (iii) to predict long-term road maintenance intervention costs; (iv) to compare the predicted road maintenance costs for various vehicle fleet scenarios. Key features of the model include: (i) modelling