Acoustic non-intrusive method for check of the set point of a sp

Details Acoustic non-intrusive method for check of the set point of a sp Acoustic non-intrusive method for check of the set point of a sp

1977-01-24

1978-05-02

Ruehl, Charles A.

Measuring and testing

Spring testing

73579, 73DIG1, G01L 110

Patent

active

040868095

ABSTRACT:
A loaded spring in a pressure relief valve or other spring-loaded device is excited with acoustic vibrations and the resonant frequencies of selected vibration modes are measured. Changes in spring constant due to aging and high temperature are detected by monitoring the longitudinal vibration mode resonant frequency, and changes in loading by monitoring the transverse and/or torsional vibration mode resonant frequency. The pressure set point is ascertained from manufacturing data of resonant frequency versus set point.

REFERENCES:
patent: 2782633 (1957-02-01), Stauss et al.
patent: 2784588 (1957-03-01), Humble et al.
patent: 3232102 (1966-02-01), Goss et al.
patent: 3394587 (1968-07-01), Freeman

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