摘要
研究了粘弹Rayleigh波的传播特性。基于基本粘弹理论,推导出了粘弹Rayleigh波频散方程及位移表述式,探讨了粘弹模量对波频散特性及衰减特性的影响。发现在小粘滞的情况下,粘弹对相速度的影响不大,波的衰减和粘滞模量近似成正比,同样量级的体变粘滞引起的频散及衰减比切变粘滞要小很多。数值上还计算了粘弹Rayleigh瞬态波形,计算结果与理论预言一致。
The propagation characteristics of viscoelastic Rayleigh wave are studied theoretically. Based on general viscoelastic theory, the frequency equation and the normal displacement of viscoelastic Rayleigh wave are derived, the influence of the viscoelastic modulus on dispersion and attenuation is discussed. We found the effect of viscosity on dispersion curves is small relatively, but its effect on attenuation is directly proportional to viscosity modulus in the case of little viscosity, the effect of shear viscosity on attenuation curves is much more than that of bulk viscosity. The transient waveforms of viscoelastic Rayleigh wave are also simulated, which are showed in good agreement with the theoretic predictions.
出处
《声学学报》
EI
CSCD
北大核心
2007年第4期338-342,共5页
Acta Acustica
基金
国家自然科学基金(10234060
10134020)
