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This paper describes an analysis of shimmy phenomenon appeared on a steering system of two wheeled vehicles. Initially, in order to confirm the shimmy, experiments were carried out on a test track and on a drum tester, so that the mode can be clearly defined. Next, we construct the steering model for a two wheeled vehicle using a new tire model to show the dynamics. From the results, it is found that the model describes the shimmy not only qualitatively but also quantitatively. Furthermore, it is clear that the tire characteristics have a strong influence on shimmy with the steering model.

This paper describes a fundamental design for a riding simulator of two wheeled vehicle which is used to analyze the human factor of riders. At the first step of this research, the relationship between the movement of rider and behavior of a two wheeled vehicle is inquired with experiments on a proving ground. Based on the results, the degrees of freedom which is required by simulator and main input of rider are settled. This study goes along examination of the expression method of simulated movements, and production of the riding simulator.