| 摘要 |
PURPOSE: To reduce the noise by allocating short and long pitches in order from the origin of perpendicular coordinates, and performing a specified inspection on a pattern constituting unit train by the sequence of numbers obtained from a chaotic function by setting this ratio as a specific value. CONSTITUTION: A pattern constituting unit composed of a long pitch P2 whose circumferential length pitch is longer than a short pitch P1 is used, and P1 and P2 are allocated in order from the origin of perpendicular coordinates, and Divisions to form four areas laterally and longitudinally are arranged. P2/P1 is set in 1.05 to 1.50, and a definition area of a chaotic function fc expressed by [X(n+1)=fc×n] is set as the area total of two areas juxtaposed in the longitudinal direction with respective two divisions of the aix of abscissa, and a pattern constituting unit train obtained by performing a test of an expression I is provided in a pattern constituting unit train based on the sequence of numbers obtained in order by the chaotic function with the respective divisions of the axis of abscissa in this definition area. Therefore, a pitch sound is excellently dispersed, and uniformity is improved, and the noise of a tire can be reduced. |
