In the development of automotive, it is important to protect occupants from traffic accident. As a countermeasure, the performance of impact absorption is provided to vehicle body frame. The bumper system is important structural parts which absorb impact energy when traveling at low speed. These bumper systems are consists of a stay and a beam. The bumper system should have good storing characteristics, and have high energy absorption properties. Therefore, much time is necessary for development of the bumper system. We suggest the outline design technique that desired energy absorption is possible here. In other words, we compare the numerical analysis result with Rankine’s role and evaluate the validity and build a new design guideline.

In this study, we tried to analyze the relationship between golf swing and golf club weight based on cooperative action as the first step to design a club adapted to individual swing. For extracting cooperative action from golf swing, we conducted experiment of acquiring swing data. Subjects were two experienced golfers. In this experiment, subjects swung two clubs that differ the club weight. We measured two experienced golfers’ swings by motion capture system (VICON). We built observance matrix from acquired positional data and we conducted singular value decomposition (SVD) on this observance matrix. By conducting SVD, we extracted cooperative action as some independent modes. Then, we conducted Three-Way ANOVA to main mode. As a result, we reached the following conclusion that we could decompose a swing data to some independent modes. From result of researching relationship a golf club weight and the mode acquiring, we confirmed main modes to be varying with difference of the golf club weight. Moreover, we confirmed some modes to be varying in common to each subject with difference of the golf club weight.