초록 ▼

Noise generated by load supporting elements of an apparatus (e.g., tread of a tire) having a plurality of repeating design cycles is spread over a broad frequency spectrum. This is accomplished by designing load bearing elements in accordance with the following procedure: First, determining the maxi

Noise generated by load supporting elements of an apparatus (e.g., tread of a tire) having a plurality of repeating design cycles is spread over a broad frequency spectrum. This is accomplished by designing load bearing elements in accordance with the following procedure: First, determining the maximum number of repeating design cycles which may be placed about the apparatus; Second, selecting a maximum pitch ratio; Third, determining the appropriate number of harmonic segments into which the apparatus can be divided; Fourth, determining the size of each of the harmonic segments and the number of design cycles for each of the harmonic segments; Fifth, arranging the various design cycles in each of the harmonic segments so that the wave length of the predominant modulation frequency of the segment corresponds to the fundamental length of that segment.

대표청구항 ▼

A tire provided with a tread having a plurality of load supporting elements placed about the circumference of said tire, said tread comprising: a plurality of repeating design cycles placed continuously about the circumference of said tire, said design cycles having at least two different pitch leng

A tire provided with a tread having a plurality of load supporting elements placed about the circumference of said tire, said tread comprising: a plurality of repeating design cycles placed continuously about the circumference of said tire, said design cycles having at least two different pitch lengths including a shortest pitch length and a longest pitch length arranged about said tread so as to provide a plurality of not less than three harmonic segments of different lengths, not more than one-half of the length of any of said three harmonic segments comprising consecutive pitches of the same length, each of said three harmonic segments including at least one of each different pitch length used in the tire, the boundary between said harmonic segments being determined by a transition from a pitch length longer than said shortest pitch length to said shortest pitch length, the rounded fractional portions of the circumference represented by the lengths of the three harmonic segments corresponding to three different terms of the group consisting of the first nine terms of the harmonic series, each of said harmonic segments corresponding to a different frequency in the sound spectrum.