Method and apparatus for analyzing a damped structural specimen

Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Content or effect of a constituent of a liquid mixture

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73 717, G01N 2900

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active

040317447

ABSTRACT:
A method and apparatus for analyzing a damped structural specimen permits undamped mobility values and modal accelerations to be determined. The specimen is excited by vibrations in conventional fashion, and both actual and modified mobility response curves or characteristics are determined from measured responses. The modified mobility curve is produced by adding to a signal representing the vibratory force applied to the specimen an artificial force signal generated electronically. The generated artificial force signal simulates the addition or subtraction of mass at the point on the specimen where responses are measured. An undamped mobility value of the damped specimen is determinable at resonant frequencies indicated by the modified mobility curve. From the undamped mobility value and the corresponding frequencies, it is possible to determine modal accelerations for the various vibratory modes of the specimen.

REFERENCES:
patent: 3620069 (1971-11-01), Cole, Jr.
patent: 3758758 (1973-09-01), Games et al.

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