Research On Side Passive Safety For Electric Bus With Simulation And Structure Optimization

The study focuses on the plug-in electric school bus BJ6106SHEVSA, a side impactfinite elements model and a rollover collision finite elements model are established andcalculated respectively. Passive safety analysis is conducted based on the results of thesimulation. In order to improve the passive safety especially power battery system of theelectric bus, structure optimization schemes are proposed. The main works of this researchare as follows.First of all, the electric bus frame finite element model and the finite element model ofpower battery system are established. Reference to side collision regulations, mobiledeformable barrier finite element model is established. The side collision finite elementmodel is established and calculated. According to the rollover crash regulation, a livingspace, rotating platform and rigid ground finite element models are established, the rollovercrash finite element model is established and calculated.Secondly, according to the result of side impact finite element simulation, themovement process and structural deformation in the collision process are analyzed. Withthe analysis of the power battery system safety problems, this paper points out that the largedeformation of battery box and batteries may cause problems such as electrical damage tothe passengers. According to results of the rollover crash simulation，the process of electricbus and its power battery system safety are analyzed.Finally, Aiming at improving the power battery system safety, the structure of thebattery box and nearby components are improved, Design of simulation experiments for thestructure optimization are conducted by adopting orthogonal testing method. It is concludedthat the optimal scheme is efficient to improve the power battery system safety. In view ofthe bus passive safety, this paper puts forward optimization measures by using high strengthsteel and increasing the thickness in the position of the large distortion of the body frame.After optimization，the side frame does not invade the living space, the bus passive safety isconformed to the requirements of the regulations, which proves the effectiveness of theoptimization.