Evaluation method of tread pattern pitch arrangement of pneumatic tire

摘要

PCT No. PCT/JP96/02992 Sec. 371 Date Jun. 12, 1997 Sec. 102(e) Date Jun. 12, 1997 PCT Filed Oct. 16, 1996 PCT Pub. No. WO97/14946 PCT Pub. Date Apr. 24, 1997A pneumatic tire has a tread pattern shaped in such a fashion that pitches determined by groove portions disposed on a tread surface in a predetermined pitch in at least a tire circumferential direction have at least three different kinds of pitch lengths. An amplitude waveform corresponding to the frequency of noise resulting from the pitch arrangement per circumference of the tire is determined by a noise simulation method, and whether or not the pitch arrangement determined by the noise simulation is a pitch arrangement of a low pattern noise is evaluated from the value of a correlational coefficient R between the amplitude waveform and a quartic expression obtained by the regression of the amplitude waveform.