圆柱壳中较高阶结构振动波的传播特性

研究了圆柱壳中较高阶周向模态结构振动波的频散特性，得到了相应的频散曲线．分析了自由振动波的性质及其随频率变化的规律，结果表明：高阶周向模态弯曲波具有通常意义上的弯曲性质；起始频率对扭转波和纵向伸缩波的传播性质影响很大；纵向伸缩近场波和扭转近场波都不具有通常意义上的纵向伸缩和扭转的性质，弯曲近场波则具有通常意义上的弯曲性质；衰减驻波大体上是弯曲性质的驻波．

Dispersion Characteristics of Higher Order Structural Vibration Waves in Cylindrical Shells

Dispersion results of the structural vibration waves of higher order circumferential modes in cylindrical shells are calculated, and corresponding dispersion curves are obtained. The nature of the free vibration waves and its variation with the driving frequency are analyzed. The results show that the higher order circumferential mode flexural waves are of flexural nature, and the cut in frequency affects significantly the torsional waves and the longitudinal extensional waves. However, the longitudinal extensional near field waves and the torsional near field waves do not have extensional and torsional nature, although the flexural near field wave do have flexural nature, and the evanescent standing waves are by and large of flexural nature.