A Study on Analysis and Evaluation of Human Body Motion in Loading Operation (2nd Report)
Kazuaki IWATA, Toshimichi MORIWAKI, Tsuneo KAWANO, Takeshi MIHARA · Journal of the Japan Society of Precision Engineering · 1982
A system is established to analyze and evaluate three-dimensional human body motions, which is applied to analyze simple loading and unloading operations. A three-dimensional model of human body consisting of seventeen equivalent rigid cylinders is proposed and the equations of motion are derived. A sequence of loading and unloading motion in both the frontal and the sagittal planes were taken simultaneously employing a 16 mm movie camera with use of a life-size mirror placed in front of the subject. The three-dimensional information of the motion is taken into a minicomputer via a graphic tablet. The threedimensional computer graphics are utilized to display the motion patterns of the operation, the loci of the body center of gravity and the correlations of the angles among the major body joints for detailed analysis of the operation. The forces and torques acting at individual joints are also estimated for quantitative examinations of the motion by solving the equations of motion based on the motion data.