Wheel Behavior Measurement Based on Ultra-High-Speed Zoom-Tracking Video Shooting

Analysis of the behavior between the wheel and the road surface is important for understanding a vehicle's safe traveling performance. In contrast, sensors attached to the wheels have many limitations, and it is difficult to capture slipping phenomena such as spinning and sliding with rotation sensors alone. In addition, it is difficult for a fixed-point camera to capture phenomena between the wheel and the road surface that cannot be predicted when and where they will occur because the angle of view is limited. Here, high-speed zoom tracking was performed remotely using ultra-high-speed active vision. Image analysis of the rotating wheel, which is always magnified at the center of the high frame rate image, enabled non-contact measurement of wheel behavior while the vehicle moved. Experiments were conducted using actual N-gauge model vehicles and Segways to clarify the slipping phenomena of running vehicles and analysis of wheel deformation behavior. By analyzing tracking zoomed images taken at 500 fps, we quantitatively verified the measurement of slip during sudden stop and sudden acceleration and wheel deformation behavior during running over hump.