半値幅法による損失係数への振動モードの影響

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 the viscoelastic layer. However, the method involves problems of large measurement errors and of the beam shape, which does not represent practical applications. This paper discusses the relatinship between vibration modes and measurement accuracy, and presents specimen dimensions which materialize the bending mode for the accurate loss factor. The vibration modes are classified into torsion, warping, torsion and warping, and bending. According to the discriminants this study induces, the beam shape has 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 dimension limits and the Oberst theory had good agreement with the loss factor of the 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
1991-07-25