Measuring and testing – Vibration – Mechanical impedance
Patent
1982-08-28
1983-12-06
Birmiel, Howard A.
Measuring and testing
Vibration
Mechanical impedance
73575, 73584, G01H 1500
Patent
active
044185731
ABSTRACT:
A fast and reliable method is disclosed for measuring the dynamic mechanical properties of a material, particularly its modulus of elasticity and loss factor. By this method the acoustic characteristics of a material can be determined. An elongate strip of material, whose properties are desired to be known, is provided with miniature accelerometers fixedly secured to its opposite ends. One end of the strip is excited by a random noise source which travels toward the other end where that end and accelerometer is allowed to move freely (unrestrained). The accelerometers measures the ratios of acceleration at two locations over an extended frequency range of 0.2 Hz to 25 KHz, and the information is processed through a fast fourier transform spectrum analyzer for determining amplitude of acceleration ratio and phase difference between the two accelerometers from which Young's modulus and loss factor for that material are determined.
REFERENCES:
patent: 2695517 (1954-11-01), Wiggins
patent: 3030803 (1962-04-01), Painter
patent: 3319460 (1967-05-01), Barigant
patent: 3323352 (1967-06-01), Branson
patent: 3933032 (1976-01-01), Tschoengl
"Longitudinal Forced Vibration of Viscoelastic Waves with End Mass", Norr Jr. and Chung, Special Report #135, U.S. Army Cold Regions Research and Engineering Lab., Hanover, N.H., Apr. 1970, Contract #DA-AMC-27-021-67-G21.
Lee Gilbert F.
Madigosky Walter M.
Beers R. F.
Birmiel Howard A.
The United States of America as represented by the Secretary of
Walden K. E.
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