Sizing and Topology Optimization of a Chassis Frame

The application of sizing and topology optimization to a complete chassis frame has been undertaken to improve its performance within mass/weight constraints. The static frame stiffness (vertical bending and torsion), the first four modal frequencies and point mobility numbers were targeted for improvement. First, sizing optimization was undertaken to meet frame targets. The gage thicknesses of a number of different components, were allowed to be varied. This resulted in an increase in frame weight. Later topology optimization was undertaken to recommend the area where weight can be taken off without affecting the performance. An MSC NASTRAN optimizer was used for all the analyses.