This paper is intended to analyze the dynamic characteristics of a hand tractor by constructing its dynamic model and performing vibration experiments. The main results are as follows; (1) The dynamic model of the hand tractor was constructed. This model has an equivalent spring and a dashpot at the driving wheel in forward and vertical direction, respectively. (2) The functions of frequency response between input and output were obtained by solving the dynamic equations of the model. (3) The simulations of the functions of frequency response were performed by substituting into the equations obtained from the analyses of frequency responses. Consequently, the peaks of the functions of frequency response were observed near 5Hz and 2Hz in cases of vertical and forward direction, respectively. These values are almost equivalent with the frequencies of the equivalent spring constants in the vertical and forward direction of the hand tractor's wheel, respectively. (4) The results of the vibration experiments for verification of the dynamic model were shown to be almost the same as the results of simulations of the functions of frequency response. Consequently, the dynamic model of the hand tractor constructed in this paper may be used in the analyses of the hand tractor's dynamic stability.
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