Bombardier uses modeFRONTIER to optimize high-speed trains
Reducing energy consumption implies optimizing the aerodynamic shape of a vehicle, thus inevitably facing two main opposing factors: the best models for drag do not have a good crosswind stability, and viceversa. In addition, high passenger capacity conflicts with optimal aerodynamic shape and elegancy and functionality not always go hand in hand. These are some of the reasons that made Bombardier choose modeFRONTIER, the multi-objective, multi-disciplinary optimization platform, for their award-winning ZEFIRO 380 train design.
Rail transportation is a concrete eco-friendly solution for sustainable mobility. Therefore, if we decrease the aerodynamic resistance of our trains, we can increase energy efficiency and further reduce CO2 emissions.
The goal was to find a Pareto-optimal, or trade-off, design which would simultaneously give low drag and good cross-wind stability characteristics. The solution was obtained using modeFRONTIER, not only to integrate the various CAE tools in use at Bombardier, but also to drive the geometry modification and simulation process providing the necessary graphical tools for the statistical interpretation of results. modeFRONTIER, developed by ESTECO, uses genetic algorithms to determine Pareto optimal solutions, combining 3D models and simulations of aerodynamic drag and cross-wind stability. Bombardier experts considered as many as sixty different design parameters in the modeling phase, taking into account the train’s outer shell, cab, crash structure and ergonomic constraints. The company was therefore able to reduce the aerodynamic resistance by 20%, obtaining a decrease of energy consumption of about 10%. By using modeFRONTIER, Bombardier engineers were able to choose from a selection of designs in order to suit particular styling preferences, but secure in the knowledge that each complies with the principles of optimized energy performance and maximum stability and safety.
The application of the multi-objective optimization method to Bombardier high-speed trains leads to a highly competitive product, entailing both to energy efficiency and cost reduction, due to a lower traction power dimensioning.