Analysis of the influence of motorcycle aerodynamics on frame flexibility

TsuyoshiI I. Katayama･Masanori Myoyo (Kurume Institute of Technology)･Yuto Fujimoto (Kurume Institute Technology)･Takahiko Yoshino (Kurume Institute of Technology)

When the bending freedom of the front frame of a motorcycle becomes softer, the weave mode becomes unstable. Aerodynamic forces affect the amount of bending of the front frame. This paper shows that the aerodynamic forces change the side force of the tire, increasing the amount of bending of the front frame and destabilizing the weave mode.

Distance Calculation and Position Measurement Method Using Omnidirectional Images

Junji Hirasawa (Ibaraki KOSEN, College of Technology)

The author studied a method to estimate the position of a motorcycle using only externally captured image data. In this presentation, a method that utilizes the rider’s helmet as a marker and estimates the distance by incorporating its apparent size in the image is proposed. The results of my preliminary trials using this approach are presented. Furthermore, a method for calculating the vehicle's position and deriving its trajectory by combining these pieces of information is also presented.

Design Requirements Enabling Hands-Free Straight-Line Driving on Slanted Surfaces for a Personal Mobility Vehicle (PMV) Equipped with a Tilting Mechanism
-Comparison with Passenger cars and Motorcycles-

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

In general, roads are constructed with a transverse gradient relative to the direction of travel to facilitate drainage. For narrow personal mobility vehicles (PMVs), which frequently operate near the left edge of the roadway, it is particularly important to ensure stable straight-line travel without active steering input in order to enhance operational safety. Accordingly, this study aims to clarify the design requirements that enable a PMV equipped with a tilting mechanism to maintain hands-free straight driving on slanted road surfaces, through a comparative analysis with passenger cars and motorcycles.

Investigating the Kinematic Performance of E-scooter via Real-world Comparative Experiment with Bicycle

Huiping Zhou･Akira Ohtani (JARI)･Takashi Hasegawa･Hiroyuki Mae (the Japan Automobile Manufacturers Association)

This study aims to investigate the causes of e-scooter accidents by clarifying the kinematic characteristics. Test-course experiment comparing with bicycle was conducted, and data was collected for straight riding, normal braking, harsh braking, and normal turning scenarios. The results revealed that, compared to bicycles, e-scooter exceeded the designated stopping target line more frequently during normal braking. In harsh braking, a delay of initiating braking and a relatively long stopping distance were observed. Furthermore, e-scooters exhibited less stable speed control in straight riding. These findings suggest that e-scooters' longer stopping distances, especially during harsh braking, may increase the risk of rear-end collisions.