Optimal Design For Crash Characteristics Of Car Front Side Member Using Origami Engineering

Crashworthiness in collision accident is the KPI of vehicle passive safety, the researchemphasis is on collision energy absorption characteristics about body structure，in thepremise of protecting the occupant’s space，to seek the research on improving body structurecrashworthiness。There are three types of Collision form when the accident happened：thepositive side impact and collision, behind collision, besides the crash and tipping, etc.According to the material, it is known that the car front collision is the most probability inall collision accident, and the front collision caused more injuries. When the car frontcollision happened, frontal side member can absorb the most energy. Therefore, the designand research of the car’s frontal side member in improving the passive safety car hasimportant significance. This article introduced the reverse spiral cylindrical origamistructure and with different segments concave-convex origami structure of origamiengineering into the frontal side member’s design, simulate and optimization design onpositive impact.Reverse spiral cylindrical origami structure and with different segmentsconcave-convex origami structure is a kind of efficient energy absorption structure whichbased on the frontal side member’s collision energy absorption characteristics.Based on thenonlinear finite element theory, using the method of combining ls-dyna and response surfaceoptimization method, to simulate and optimization design about the origami structure’spositive impact. This article analysed the positive impact of frontal side member, and get thebest girder structure shape design parameters in the specified design scope. The results showthat the energy absorption characteristics of the reverse spiral cylindrical structure and withdifferent segments concave-convex origami structure have been significantly improved.In order to make the origami structure of the car’s frontal side member geometricsurface more smooth. This article based on the improved butterfly subdivision method, tosubdivide the reverse spiral cylindrical origami structure. According to the improvedbutterfly subdivision algorithm, by means of Microsoft Visual C++6.0to design theprogram about the reverse spiral cylindrical origami structure, use this method to surfacemeshing、the first subdivision and the second subdivision. Take subdivision results toanalyze which has both structure and crashworthiness. The results showed that the reversespiral cylindrical origami structure after subdivision which unit mesh has good quality、the surface more smoother and energy absorption characteristics has been improved notably. Atthe same time, it provided some reference about improving the crashworthiness design ofcar’s girder and other components.