Although tread block deformation analysis is important, the deformation
measurement is difficult because fast-rotating tires maintain a continuous
contact with the road surface. Furthermore, capturing small displacements near
the edge of tread blocks using a high-speed camera is difficult because of the
particularly limited resolution. Additionally, the tread blocks being
significantly deformed at the edge and susceptible to wear powder, the state
change of the feature points, is highly probable. To overcome these problems, a
system that obtains high-resolution images and measures the deformation of a
fast-rotating body (tire) is proposed herein. The developed system captures the
deformation behavior through intermittent imaging. To further measure the strain
distribution, fine tracking markers are drawn on the tread block using a laser
processing machine. The displacement of the marker is calculated using the
particle mask correlation method. Measurements of a single-block tire with a
rolling velocity of 50 km/h, using a 24M-pixel camera at 8,333-Hz
pseudo-sampling frequency, have shown the ability of the developed system in
capturing spatial resolutions and strain in the orders of 0.01 mm and 0.001,
respectively. Furthermore, the strain distribution is comprehensively
visualized, and a few deformation features of the tread block of a fast-rotating
tire are shown.
