Damping-induced frequency shifts in band structures of one-dimensional viscoelastic phononic crystal rods

被引：0
作者：
机构：
[1] School of Mechanical Engineering, Xi'an Jiaotong University
[2] State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University
来源：
Wu, J. | 1600年 / Xi'an Jiaotong University卷 / 48期
关键词：
Band gap; Band structure; Damping; Phononic crystal; Viscoelastic material;
D O I：
10.7652/xjtuxb201403005
中图分类号：
学科分类号：
摘要：
To understand the influence of damping on the band structures of phononic crystals (PCs), the vibration band structures of one-dimensional viscoelastic PCs are investigated and analyzed theoretically by iteration method for plane wave expansion (PWE), based on standard linear solid (SLS) model of viscoelastic materials. Compared with the case of constant modulus, the storage modulus and the loss modulus exert clearer influence on the band structures and the gap bandwidth due to the frequency dependence of the complex modulus. In particular, the influence of loss modulus cannot be ignored in the frequency range around the damping peak, where the frequency bands are shifted to the higher range, but the other bands almost remain unchanged, thus the gaps below and above the bands are widened and narrowed respectively. These results provide theoretical basis to research viscoelastic phononic crystals and an effective way to obtain broad band gaps for phononic crystals.
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页码：22 / 27+48
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