圆柱壳中结构振动波的传播特性

Dispersion Characteristics of Structure Vibration Waves in Cylindrical Shells

计算了圆柱壳中低阶和高阶周向模态结构振动波的频散结果，得到了相应的频散曲线。着重分析了近场波和衰减驻波的性质及其随频率变化的规律，结果表明：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弯曲性质；衰减驻波大体上是弯曲性质的驻波。文中把低阶和高阶周向模态情况下波的频散规律也作了比较。

Dispersion results of circular cylindrical shells in low and high circumferential modes are calculated and corresponding dispersion plots are obtained.Primarily,characteristics of near field waves and evanescent standing waves and its variation with driving frequency are analyzed.The results show that extensional near field waves and torsional near field waves do not have extensional and torsional nature,as usually expected,but flexural near field wave have flexural nature.Evanescent standing waves are of flexural nature.Dispersion behavior of the waves in low and high circumferential modes are also compared.