Bolt load determining apparatus

Measuring and testing – Vibration – Resonance – frequency – or amplitude study

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Details

73761, G01H 1300, G01N 2900

Patent

active

044022220

ABSTRACT:
A first signal at a first frequency which is a selected harmonic of the resonant frequency of a bolt in a first loaded condition is determined. Then there is determined a second signal at a second frequency being the same harmonic of the resonant frequency of the bolt in a second loaded condition. Both frequencies are multiplied by a factor M. The up input of a counter receives one of the signals for a predetermined duration, and the down input receives the other signal for the same duration. The number of pulses remaining in the counter is representative of the difference in load between the first and second loaded conditions.

REFERENCES:
patent: 4014208 (1977-03-01), Moore et al.
patent: 4117731 (1978-10-01), Heyman
patent: 4363242 (1982-12-01), Heyman

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