Novel Measuring System using Omnidirectional Cameras and Spherical Mirrors and its Application for a Motorcycle Dynamics

Junji Hirasawa (Ibaraki College of Technology)

Author proposed a novel measuring method that use 2 omnidirectional cameras to measure a running motorcycle. This method has some problems, the largest problem is errors on the camera base line. To solve these problems, improving equipment with spherical mirrors were proposed. In this paper, results of running tests with an actual motorcycle are described.

Effect of Frame Deformation on Motorcycle Dynamics (First Report)

Kazunobu Sakamoto･Masahiro Kusakari･Yuki Nakatani･Hiroshi Kitagawa (Yamaha Motor)

In order to clarify the relationship between frame stiffness and dynamic performance, it is essential to understand the relationship between the forces and deformations that constitute stiffness. Therefore, frame deformation during actual running was obtained and the relationship between the forces and deformation applied during turning was analyzed. As a result, the characteristics of deformation that contribute to dynamic performance were found.

Analysis of the Effect of Frame Flexibility on the Weave Mode of Motorcycles
-Example of Multiple Frame Flexibility Influences-

Reiya Haraoka･Takahiko Yoshino･Tsuyoshi Katayama (Kurume Institute of Tecnology)

When multiple frame flexibility are involved, weave modes destabilize uniformly at high speed.
In this paper, we use the energy flow method to investigate the factors involved in the destabilization of multiple frame flexibility.

Analysis of the Influence of Aerodynamic Forces On the Stability of High-Speed Weave Mode of Motorcycles

Tsuyoshi Katayama･Reiya Haraoka･Ayaka Gyotoku･Takahiko Yoshino (Kurume Institute of Technology)

Analysis using a 10-degree-of-freedom frame flexibility model shows that the aerodynamic drag coefficient destabilizes the weave mode. Increasing the aerodynamic drag coefficient reduces the ground load on the front tire. As a result, the cornering power of the front tire decreases. Smaller cornering power delays the phase of the steering angle, which is the element that determines the front tire side force. The phase delay of the steering angle makes the weave mode unstable.