对超声纵向导波在复合管状结构中的传播特性进行了分析.然后分析了系统中的位移分布,以此确定了各模式检测管材的最佳频厚积范围和检测的最佳位置.结果表明,各模式的径向和轴向位移在管内壁上的值较大,而在管壁中间和管外壁上的值较小;当频厚积增大到一特定值后,管壁中间和管外壁上的径向和轴向位移都近似为零,此特定值随模式阶次的提高而增加.选取各模式检测的频厚积时,应尽可能的选径向位移较小而轴向位移较大的频厚积点.
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