Abstract
The straight running stability of motorcycle is greatly affected by frame flexibilities. In this study, six types of 5-degreeof- freedom models are used, in which a single frame flexibility is added to the basic 4-degree-of-freedom model. Changes in energy flow are calculated in order to analyze the effect of frame flexibility on weave mode. Specifically, a formulation based on the eigenvector equation is used. As a result, the weave mode can be suppressed by adding a damping ratio to the twist flexibility model of the rear swing arm.
