Measuring and testing – Vibration – Resonance – frequency – or amplitude study
Patent
1991-06-17
1993-10-19
Williams, Hezron E.
Measuring and testing
Vibration
Resonance, frequency, or amplitude study
G01H 13000
Patent
active
052535282
ABSTRACT:
Nondestructive testing of heat exchangers (12), such as a radiator, measures the percentage of good bonds between air centers and cooling tubes based on natural or resonant frequencies of the exchanger (12). The exchanger (12) is excited by an audio speaker (38) and measured for a first natural frequency in the center thereof by an accelerometer (44). The natural frequency is indicative of the percentage of good bonds in the center portion of the exchanger (12) based on the stiffness thereof. The audio speaker (38) is moved to an antinode of a higher frequency mode to measure a second natural frequency indicating the percentage of bonds at the edges and corners thereof. The resonant frequencies are compared to standards to determine the actual percentage of good bonds.
REFERENCES:
patent: 2486984 (1949-11-01), Rowe
patent: 3355933 (1967-12-01), Rowe
patent: 3815407 (1974-06-01), Lavery
patent: 3857279 (1974-12-01), Salzer et al.
patent: 4287766 (1981-09-01), Ensminger
Brittin Kent E.
Chen Francis H.
Kiel Wolfgang
Quinn Patrick D.
Tesnow Kurt A.
Ashraf Nashmiya
General Motors Corporation
Williams Hezron E.
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