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The computational method and the CAE technique have been developed to evaluate durability performance of a motorcycle body. The computational method in this study consists of three parts of simulation. The first is the mode analysis of the body parts. The second is the multi body dynamics simulation, which calculates forces loaded into the frame of a motorcycle body equivalent to actual durability tests. The third is the static structure analysis, which calculates stress distribution using the forces calculated by the multi body dynamics simulation as boundary conditions. Also, two kinds of durability tests, that are the chassis durability test and the falling durability test, are simulated in this study.

In order to optimize the balance between aerodynamics and air-cooling performances for a motorcycle, a simulation method of external flow around a vehicle has been developed. In this paper, steady-state flow calculations were performed using two types of turbulence models, the realizable k-ε and the SST k-ω, and two levels of mesh sizes of computational models and their results were compared. To validate the computational results, wind tunnel tests were conducted and CD, CL and mean velocity of flow passing through heat exchangers were measured. The computational results on drag coefficient and mean velocity show good agreements with the experimental ones.