| 摘要 |
<p>A tread pattern of a tire is formed by rows of pattern-forming units in each of which s kinds of pattern-forming units of different pitches, i.e. circumferential lengths are arranged circumferentially. First, pattern-forming units are allotted in the order of increasing pitch P starting at the origin to each section of the horizontal and vertical axes. A chaotic function defining definition region out of all regions existing in a certain section of the horizontal axis and lined up in the longitudinal direction is determined in each section of the horizontal axis. The chaotic function is expressed by X(n+1) = fc(Xn) wherein the horizontal and vertical axes are represented by Xn and X(n+1) respectively in the definition region. Rows of pattern-forming units are obtained on the basis of function values obtained in order by this chaotic function. Verified rows of pattern-forming units obtained by verifying these rows of pattern-forming units are used. Consequently, a tire having a pattern capable of reducing an unpleasant feeling due to the noise occurring during the rotation of the tire can be obtained.</p> |
