In Mazda, weight reduction of car body structure design using response surface method (RSM) and evolutionary computation (EC) has been applied from CX-5 since the 2012 launch. The calculation result of the EC had been contributed to weight reduction of several kg. However, since the optimal solution of the response surface method includes an error with computer aided engineering (CAE, finite element method etc.), designers were not able to use optimization technique. Therefore, in the development of a new generation product group, we have developed and applied a car body structure design method using evolutionary data mining without response surface method. I will report case examples of application to CX-8 (Japan Only) and new Mazda 3.
TAKEHISA KOHIRA graduated in aerospace engineering. In 2005 he joined Mazda Motor Corporation, where he is now an Assistant Manager (Senior Specialist). He is responsible for developing a future super light car body using evolutionary computation. He is involved in the development of car body structure based on the structural dynamics of an airplane. He contributed to the weight reduction of CX-5, Mazda 6, Mazda 3, MX-5, Mazda 2 and CX-3.