Motion Measurement of a Motorcycle Using IMUs

Junji Hirasawa (National Institute of Technology, Ibaraki College)

This paper discusses the motion measurement of a motorcycle using inertial measurement units (IMUs). The author proposes a novel method for estimating position from omnidirectional images for the purpose of motorcycle motion analysis. To verify the validity and accuracy of the proposed method, the analysis is performed using measurement results obtained simultaneously from multiple compact IMUs. The processing of the measurement data and the calculation of centrifugal force are also discussed.

Influence of Road Friction Characteristics on Two-Wheeled Vehicle Behaviors

Ichiro Kageyama (Consortium on Advanced Road Friction Database/Nihon University)･Atsushi Watanabe･Yukiyo Kuriyagawa (Nihon University)･Tetsunori Haraguchi (Consortium on Advanced Road Friction Database/Nihon University)･Tetsuya Kaneko (Osaka Sangyo University)･Minoru Nishio (Absolute)

This study aims to understand the effects of various road friction characteristics on motorcycle motion. To achieve this, motorcycle tire characteristics that represent characteristics according to road friction characteristics are constructed using a brush model that represents adhesion and slippage regions. The constructed tire model is then incorporated into a quasi-steady analysis model for a motorcycle, and vehicle characteristics on roads with different road friction coefficients are analyzed.

Analysis of the Influences of Motorcycle Design Parameters on Weave Mode Stability

Tsuyoshi Katayama･Masanori Myoyo･Yuto Fujimoto･Takahiko Yoshino (Kurume Institute of Technology)

Weave mode of motorcycles shows complex behavior depending on the vehicles design parameters. Interpretation is particularly difficult in eigenvalue analysis using multi-degree-of-freedom equations that include frame flexibility. In this paper, differences in the behavior of stability in weave mode are discussed using four types of design parameters that already been published. It is shown that the main factors are the flexibility of the frame, the cornering power of the tires, and the aerodynamic characteristics.

Consideration of Pitch Attitude of Personal Mobility Vehicles (PMVs) during Tilted Cornering

Tetsunori Haraguchi (Nagoya University/Nihon University)･Tetsuya Kaneko (Osaka Sangyo University/Nihon University)

During cornering in passenger cars, body roll slightly lowers the driver's forward gaze point, and a gently nose-down roll posture is generally considered desirable. In contrast, in PMVs, where the body tilts significantly inward, the driver tends to look “upward” toward the direction of travel. Based on these observations, this study provides a hypothetical consideration of the appropriate pitch attitude of a PMV during cornering and its relationship to the front and rear suspension characteristics.