Harmonic signal analyzer system for testing tires

Details Harmonic signal analyzer system for testing tires Harmonic signal analyzer system for testing tires

1971-03-01

1976-04-20

Gill, James J.

Measuring and testing

Tire, tread or roadway

Tire inflation testing installation

G01M 1702, B60C 1910

Patent

active

RE0287750

ABSTRACT:
An electronic, undamped oscillator driven by a periodic input signal (forcing function) having a frequency equal to the natural frequency of the oscillator develops an output sinusoidal signal having a rate of growth (amplitude increase) proportional to the amplitude of the first harmonic component of the input signal. When the input signal is a force variation signal and the oscillator is tuned to the rotational frequency of a tire mounted on the force variation machine, the rate of growth of the output signal of the oscillator is proportional to the amplitude of the force variation signal. A peak follower detects the amplitude of the increments between successive peaks of the oscillator output signal. A meter indicates the amplitude of the successive peaks of the oscillator output signal, thereby indicating the amplitude of the first harmonic component of the force variation signal. A circuit which senses the positive-slope zero-crossing of the oscillator output signal is utilized to energize a tire-marking unit, thereby indicating the position of the peak of the first harmonic component.

REFERENCES:
patent: 2155528 (1939-04-01), Cadden
patent: 2712232 (1955-07-01), Pfeiffer
patent: 2839915 (1958-06-01), Roth et al.
patent: 3051933 (1962-08-01), Cressey et al.
patent: 3412615 (1968-11-01), Nedley
patent: 3452603 (1969-07-01), Kaiser et al.

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