| 摘要 |
PURPOSE: To reduce the noise by arranging pattern constituting units without alternately skipping pitches adjacent in pitch length order in the sequence of numbers by a chaotic function. CONSTITUTION: Pattern constituting units are arranged in the order of small pitches not less than three kinds, and the axis of abscissa and the axis of ordinate are set as Xn and X(n+1), and a definition area is determined with respective divisions of the axis of abscissa of a chaotic function fc of [X(n+1)=fcXn]. That is, the longitudinal directional area total of the same pitch areas in areas juxtaposed in the longitudinal direction in the respective divisions and pitch areas adjacent in the longitudinal direction on the large/small sides to them is set in shortest/longest pitch divisions of the axis of abscissa, and the longitudinal directional area total of the same pitch areas and pitch areas adjacent in the longitudinal direction on the long/short sides to them in the whole areas juxtaposed in the longitudinal direction is set in the other pitch divisions of the axis of abscissa. The pattern constituting units are arranged without alternately skipping pitches adjacent in the sequence of numbers of X(n+1) obtained by fc to satisfy an expression I, and are set as a pattern constituting unit train to be tested by the expression I. Therefore, the noise of a tire can be reduced. |
