The purpose of this study is visualization of skill of experts in automotive repair sheet metal. Five experts and five non-experts hammered the fender panels. The behavior of the hammer during hammering was shot with a high speed camera. From the obtained video, the trajectory and speed of the hammer were quantified.
This study analyzed the skill of the experience engineer in auto body repair. The striking motion of an expert's hammer during the sheet-metal molding process in an automobile repairing process was analyzed and compared with those of non-experts. We tried to clarify that measured the movement of skilled and unskilled individuals while repairing cars by using the sheet metal molding process using by a three-dimensional digital motion analysis equipment. As a result, we found that the experts used two kind of hammerings. Also, they moved almost none of the end of the hammer handle. And when we watched the movement of the hammer from the top during the hammering, the experts hammering movement were better in a circle motion.
The purpose of this research is to clarify the change of characteristics of aerodynamic drag and lift of a car by the engine loading system (engine arrangement) and the air inlet system (opening area and position) in wind-tunnel experiments and to consider a method to reduce the drag and lift. A simplified 1/5 scale car model was generated with reproduction of the engine room covered with the transparent acryl externals for visualization. In the wind-tunnel experiments, the moving-belt ground board was adopted to capture ground effects with force measurements by use of load cells. As results, with enlargement of the opening area, the drag increased overall although depending largely on the engine loading system and the opening position, and the front lift increased. As the exhaust air to the underfloor increased, the turbulent intensity measured by RMS increased and the velocity decreased. Consequently, it is considered that the pressure on the front surface, and therefore the drag, increases and that the downward momentum of the air, and therefore the lift, increases.