ON THE EFFECT OF AN END-MASS ON BEAM DAMPING
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A classical determination of damping is the measurement of the free vibrational decay of a beam. It has been suggested in the literature that when an end mass is affixed to a vibrating beam it alters the measured value of damping; the objective of this paper is to show that this is not true. To support this statement, an argument using the correspondence principle from the theory of linear viscoelasticity, and an experimental verification program are presented. The experimental study entailed verifying the theory used and measuring the damping of an aluminum alloy as a function of frequency using a total of 30 different combinations of beam lengths and end masses. Results show that within the range of experimental scatter, the damping does not depend on the end mass, thus supporting the theory.
author list (cited authors)
WREN, G. G., & KINRA, V. K.