Search for alternative full vehicle concepts by means of local and global optimization strategies.

The demands on the car body are formulated by numerous performance constraints derived from crash, stiffness and driving comfort requirements. Thus, an extremely small area of car dimensioning exists which is admissible regarding weight reduction.

It is of high interest to find out whether any competitive car concepts exist in the design space that lie beyond known car concepts or load paths. In this case, the optimization task does not only consist of an optimization of known car concepts, but includes the search for alternative vehicle concepts.

Due to the combination of genetic strategies and mathematical optimization, different car concepts could be identified fulfilling all crash, stiffness and driving comfort constraints with a significantly lower weight.

A total of about 13,000 design evaluations were computed with optiSLang within three days. After this, approximately 20 local optimizations were performed using NASTRAN Sol 200.