Discrete Topology Optimization of Bus Chassis Frame Based on NSGAⅡ

Abstract:

The non-dominated genetic algorithm Ⅱ was introduced to topology optimization of electric bus underframe, where the objectives were to maximize torsional stiffness and minimize total mass under the constraint of the maximum stress of all the beam elements within the yield strength, finally the Pareto front of optimization result was obtained. The results show that the torsional stiffness of the proposed scheme is close to that of the original model, and the quality is reduced by 89kg, which is 6.4% of that of the original model underframe and the topological effect is remarkable.

Key words:discrete topology optimization; non-dominated sorting; genetic algorithm; multi-objective optimization; stress constraints