管道中激光激发瞬态导波的理论研究  

Theoretical investigation of the laser-generated guided waves in hollow cylinders

作　　者：汤立国[1] 程建春[1] 王金兰 

机构地区：[1]南京大学近代声学国家重点实验室,南京210093

出　　处：《声学学报》2001年第6期489-496,共8页Acta Acustica

基　　金：国家教育部博士点基金项目(No.1999028432);江苏省自然科学基金项目(BK97031)

摘　　要：利用本征函数展开法详细讨论了有限长管道中导波的激光激发，给出了当四个相同能量的激光脉冲轴对称打在管外壁上时，管壁上各点振动的瞬态解，通过数值计算，给出了主要模式的瞬态波形，且从色散关系出发对瞬态波形的特征进行了定性解释。The problem of the laser-generated guided elastic wave modes in hollow cylinders is investigated numerically by using the method of eigen-function expansion. The explicit expression of the transient waveforms is given for the case of the outer surface of the hollow cylinder beat axi-symmetrically by four pulsed lasers with same energy. The characteristics of the transient waveforms are explained based on the dispersive relations.

关 键 词：管道 激光激发 瞬态导波 超声波检测 本征函数展开法 

分 类 号：TN241[电子电信—物理电子学]