Measuring and testing – Vibration – Resonance – frequency – or amplitude study
Patent
1995-04-03
1997-04-15
Chapman, John E.
Measuring and testing
Vibration
Resonance, frequency, or amplitude study
73602, G01N 2920
Patent
active
056211724
ABSTRACT:
An apparatus and a non-destructive method for evaluating material strengths is described. One embodiment of the apparatus comprises a waveform generator that generates either (1) a sinusoidal waveform having a frequency that sweeps from a low frequency to a high frequency, or a high frequency to a low frequency, wherein the low frequency is from about 10 Hz to about 150 Hz, and the high frequency is from about 6,000 Hz to about 24,000 Hz, or (2) a pseudo random within the frequency range of from about 150 Hz to about 6,000 Hz. An electromechanical driver is electronically linked to the waveform generator and mechanically coupled to a test material, particularly in-service utility poles, at a drive position. Force and acceleration sensors are coupled to the test material at various positions. A microprocessor is used to collect digitized data from the force sensor and the accelerometers, perform a transfer function and determine the strength remaining in the test material using a neural network model.
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Clauson Milo L.
Wilson James B.
Chapman John E.
State of Oregon Acting By and Through the State Board of Higher
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