2003 Volume 65 Issue 2 Pages 47-55
In the present study, the reaction force of a wheat stalk undergoing forced displacement, which was one of the important deflection characteristics, was clarified by experiment and theory. First, the horizontal and vertical reaction forces of a single wheat stalk undergoing forced displacement were measured. The horizontal force increased linearly together with increment of the forced displacement, while the vertical force had different tendencies depending on the initial posture of a wheat stalk. From experimental results, it was examined that a main reason of differences in the tendencies of the vertical force was a directional change of friction depending on the initial posture. Therefore, a differential equation describing deflection, taking into account the initial posture of a wheat stalk, was derived based on a mechanical model of a crop stalk and used for analysis of the reaction forces. In this analysis, the effect of friction was also considered. The analytical results agreed well with measured values, and it was shown that the reaction forces of the wheat stalk according to the initial posture was analyzed accurately utilizing the derived equation.
