Abstract:

Vehicle's front structure consisted of bumper and crash-box assembly, longitudinal rail and relative connection plate. During front impact, almost 50% of kinetic energy is absorbed by front structure. In the research, a sport utility vehicle (SUV) body was designed to realize structure stiffness matching, absorb required energy, reduce the crash acceleration level and improve passenger protect effect by the idea of collision energy management, finite element simulation and optimization method. The result of crash beam assembly static pressure and longitudinal rail sled crash test shows that the method of design and optimization, which based on
energy management and simulation, realizes stiffness matching well, satisfies energy absorption requirement and meets crashworthiness target.

Key words: vehicle safety, vehicle's front structure, crashworthiness, energy management, optimize, stiffness matching