Lateral forces are known to be important in motorcycle stability. These forces also affect the stability of bicycles. In this study, we focus on the influence of tire lateral forces on bicycle self-stability. On the basis of the work of Whipple, we develop a linear bicycle model, including front and rear wheel lateral forces, in symbolic equations of motion. Modal analysis and dynamic simulation of the bicycle model are conducted and used to examine self-stability. The lateral stability of a bicycle is characterized by two oscillatory vibration modes, namely, wobble and weave, and one non-oscillatory capsize mode. Tire sideslip force modeling reveals the wobble mode, and relaxation modeling reveals the rear wobble mode. At low speed, the unstable capsize mode dominates. At medium speed, the weave mode vibratory motion dominates. At high speed, the wobble mode dominates. The influence of lateral forces on self-stability is identified using the developed model. A nonlinear multibody bicycle model is used to confirm the results of the linear analysis.

서 론근래에Abstract: This study focuses on the influence of tractive forces on the self-stability of a bicycle. The eigen-value analysis of the self-stability of a passive rider control linear bicycle model can be used to analyze the self-stability. A linear bicycle model with front and rear driving forces is developed. The influence of tractive forces on the self-stability is identified by using the developed model. A nonlinear multi-body bicycle model is used to confirm the results of the linear analysis. † Corresponding Author, bys@dyu.ac.kr

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This study presents a method to evaluate overturning safety and derailment safety of korean tilting train using kinematic analysis of four-bar linkage tilting mechanism. The safety is evaluated considering tilting vehicle body CG displacement. The design sensitivity for stable and safe maximum speed is evaluated around current korean tilting train design data. The current design shows minimum center of gravity displacement. Higher speed can be achieved with larger center of gravity displacement.

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