耕うん機

It is necessary to analyze dynamic characteristics of machinery, catching the parameters of the machinery. This paper is intended to investigate parameters of the hand tractor for analyzing its dynamic characteristics. The main results are as follows; (1) The mass and center of gravity were measured by measuring the weight acting at two points and the angle of inclination of the hand tractor. Consequently, the mass is 342.1kg and the center of gravity is situated at 0.125m horizontally and 0.259m vertically from the center of the shaft of the driving wheel. The center of gravity of the hand tractor itself is situated ahead of the center of the shaft of the driving wheel, but it is situated in the rear of the center of the shaft of the driving wheel when the rotary tiller is mounted on the hand tractor. (2) The pitching moment of inertia about the centroid is measured by the coil spring method. As a result, it is 17.40kg·m^ 2. This is very small in comparision with the moment of inertia (539.66kg·m^2) of the riding tractor mounted with a rotary tiller. (3) The dynamic spring constant and the viscous damping coefficient of the tire of the tested hand tractor were found to be 131.847×10^3N/m, and 687.25N·'s/m respectively. This dynamic spring constant is greater than the static spring constant by as much as 30%, and about 1/3 of that of the rear tire of the riding tractor. The value of the viscous damping coefficient is greater than that of the rear tire of riding tractor by as much as 50%.