Abstract:

Front rails of the automotive need to have good static and dynamic characteristics to improve the crashworthiness of the automotive. In this paper, octagon beam was used as original topology optimization space of the front rail. The advantages of both static topology optimization method and dynamic topology optimization method were fully considered. Variable density method was combined with the hybrid cellular automaton method. Crashworthiness optimization design was carried out on the front rail. The maximum stiffness in axial and lateral stiffness of automotive front rails structure was obtained through the static topology optimization method. The maximum energy-absorbing structure of automotive front rail which was satisfied with axial strength obtained through the dynamic topology optimization method. According to the topology optimization results, the optimal topology configuration of front rail was ultimately determined and also verified by car test. The automotive front rail after topology optimization is applied to explorer of the vehicle frontal crash. The results show that the peak acceleration of B pillar decreases by 5.50g and the safety performance of the car improve efficiently.