Error analysis of the symmetric free-layer beam method for determining Young's modulus and loss factor of damping materials

被引：0

作者：

Qu Z. ^{[1
]}

Sheng M. ^{[1
]}

机构：

[1] School of Marine Science and Technology, Northwestern Polytechanical University, Xi'an

来源：

Zhendong yu Chongji/Journal of Vibration and Shock | 2017年 / 36卷 / 22期

关键词：

Damping materials; Error analysis; Flexural resonance method; Stiffness ratio; Symmetric free-layer beam;

D O I：

10.13465/j.cnki.jvs.2017.22.016

中图分类号：

学科分类号：

摘要：

The inverse formulas of the symmetric free-layer beam method were simplified by introducing the medium variables. Based on the simplified formulas, a total error analysis was made and the higher order expressions for error prediction were derived. The research shows that the stiffness ratio is the most significant factor influencing the inverse accuracy. More accurate results can be obtained from specimens with bigger stiffness ratios. The errors of the frequency ratio and the mass ratio are violently magnified as the stiffness ratio reaches 1, which will lead to great inverse errors. The stiffness ratio can be increased by increasing the thickness ratio and the modulus ratio between the damping and the base layer. Thus the inverse accuracy will be improved. The conclusion was verified by simulation analysis. © 2017, Editorial Office of Journal of Vibration and Shock. All right reserved.

引用

页码：100 / 103and177

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