Harmonic signal analyzer system for testing tires
USRE28775E · kind E · reissue
Assignee
Inventors
Key dates
| Filing date | Mar 1, 1971 |
| Grant date | Apr 20, 1976 |
| Priority date | — |
| Expiry date | Mar 1, 1991 |
Classification
- Technology area (CPC —)General
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.