Abstract
In this study, dynamic characteristics of crop (rice) stalks were examined in order to make clear mechanical interaction between crop stalks and a combine reel, and obtain design parameters of a reel which contribute to an improvement of accuracy and efficiency in harvesting operation. First, frequency response characteristics (amplitude ratio against a shaking frequency) and natural frequency of rice stalks were made clear through the forced vibration experiment using a shaker, which can express dynamic characteristics of rice stalk. As a result, the calculation equation of natural frequency based on bending vibration theory for cantilever beams was applied to rice stalks, and parameters concerning natural frequency of a rice stalk were discussed. Further, Rayleigh method was applied to analysis of natural frequency of rice stalks with variety sectional area, and availability of this analyzing method was discussed by comparison with the experimental results.
