Multi objective Optimization for Bus Rollover Safety Based on Kriging Model

Abstract:

A finite element model of a bus is established, and according to the ECE R66 regulation, multi objective optimization is carried out for the bus rollover safety. First, on the basis of the rollover simulation result, the section shapes of the key parts in the upper structure are selected as design variables. The maximum acceleration of the center of gravity and the mass are then taken as objectives, and the angles between side pillars and the floor are selected as constraints. Then, combined with optimal Latin Hypercube， the Kriging models of high accuracy are constructed. Finally, multi objective optimization for the bus rollover safety is performed with NSGA II, and the Pareto optimal set is obtained. The conclusion is drawn that the rollover safety can be improved by using section shape optimization when a limited mass is increased.

Key words:Kriging model; shape optimization; multi objective optimization; NSGA II algorithm