中文摘要：

Lamb波频散特性是进行超声波损伤检测的前提,采用窄带脉冲信号作为激励信号产生Lamb波,并在matlab环境下采用二分法对Lamb波的瑞利-兰姆频率方程进行了数值仿真,绘制了Lamb波在复合材料层合板中传播的频散特性曲线并分析了其特点,为超声波无损检测提供了重要的参考依据。

英文摘要：

Dispersion curves are of great important to Lamb wave in ultrasonic nondestructive testing. The narrow-band pulse was employed to generate Lamb wave. Rayleigh Lamb equation was analyzed and a numerical calculation method for Lamb wave dispersion curves was presented based on matlab, by which the phase velocity curves and group velocity curves of Lamb wave in composite material plate were plotted respectively. It was of significance for the use of Lamb wave in nondestructive testing.