摘要
兰姆波的多模式及频散特性使得其在激励、传播以及信号处理等方面较为复杂。采用频散补偿方法对在钢板中传播10 cm距离的兰姆波信号进行模拟计算。所得信号明显地减小了因频散而引起的脉冲信号拉长。实验对3 mm厚铝板中传播了10 cm的频散信号进行了处理,也得到较好的结果。
Multi-modes and dispersion of Lamb wave make it very complicated to be used in nondestructive testing field.The dispersion of Lamb wave was analyzed,a dispersion compensation method to remove the dispersion of the received signal was proposed.Mode S0 of Lamb wave propagating in 10 cm thickness steel plate was simulated,then a signal with high spatial resolution was attained.In the experiment,the signal propagating 10 cm in the 3 mm thickness Al plate was processed,and a good result was achieved.
出处
《无损检测》
北大核心
2008年第7期412-414,共3页
Nondestructive Testing
基金
国家自然基金资助项目(10574144
10774164)
关键词
超声波检测
板材
兰姆波
频散补偿
群速度
相速度
Ultrasonic testing
Plate
Lamb wave
Dispersion compensation
Group velocity
Phase velocity
