Modulating noise produced by rotating bodies

Details Modulating noise produced by rotating bodies Modulating noise produced by rotating bodies

1975-05-05

1976-11-02

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

73146, 73552, 156 64, 264326, 425 29, B29H 502, G01M 1702

Patent

active

039897800

ABSTRACT:
Noise produced by a rotating apparatus having radially extending, spaced, load carrying elements, e.g. the tread design portions of a tire, is modulated by selectively pitching and sequencing load carrying elements. The array of load carrying elements are selected from at least two different pitch lengths, the ratio of pitch lengths being within a given range of ##EQU1## N = 3, 4, 5 OR 6. Noise is further modulated by utilizing strings of 3 or more consecutive load carrying elements having substantially the same pitch length. The length and sequential position of the strings modulates the natural load carrying element frequency.
The invention is useful in the design of such apparatus as tread elements for tires, gear teeth, V-belt notching, fan blade spacing, and in other rotating apparatus.

REFERENCES:
patent: 2006197 (1935-06-01), Ewart et al.
patent: 2808867 (1957-10-01), Buddenhagen et al.
patent: 3023798 (1962-03-01), Moore et al.
patent: 3535536 (1970-10-01), Pernau

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