Effects of Vibration Modes on the Viscoelastic Loss Factor Measured by theHalf-Power Method

概要

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The loss factor of a viscoelastic damping material is commonly measured by the half-power method using a composite beam with a viscoelastic layer. However, the method involves the problems of large measurement errors and of unusual be amshape, which does not represent practical applications. This paper discusses the relationship between vibration modes and measurement accuracy, and presents specimen dimensions which materialize the bending mode for an accurate loss factor. The vibration modes are classified as torsion, warping, torsion and warping, and bending. According to the discriminants this study derives, the beam shape must satisfy (l/b)(d_1/b)≧0.06 to materialize the bending mode. The loss factor of the viscoelastic damping material, obtained by the composite beam within the dimensional limits and the Oberst theory, had good agreement with the loss factor ofthe same material measured by the nonresonance forced vibration method, and was certified to be sufficiently accurate.
一般社団法人日本機械学会の論文
1992-09-15