Abstract
Human body motions during simple loading and unloading operations are analyzed from physiological and kinematic points of view. The operational motions are projected to the sagittal plane and restricted as the planar motions. A two-dimensional model of human body consisting of nine equivalent rigid cylinders is proposed and the equations of motions are derived. Series of simple loading and unloading motions of an operator are taken from the side employing a 16 mm high speed cinecamera. The two-dimensional coordinate data of individual body segments are taken into a mini-computer frame by frame with use of a graphic tablet. The computer graphics are utilized to display the motion patterns of the operations, the loci of the body center of gravity and the correlations of the angles among the major body joints for detailed analysis of the operations. The forces and torques acting at individual joints are also estimated by solving the equations of motions based on the motion data, and the operational motions are examined quantitatively.
