利用频散补偿法消除兰姆波频散效应

基金项目:

国家自然基金资助项目(10574144，10774164)

详细信息

Dispersion Compensation Method for Removing the Dispersion of Lamb Wave

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。
- 超声波检测 /
- 板材 /
- 兰姆波 /
- 频散补偿 /
- 群速度 /
- 相速度
Abstract: 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.
- Ultrasonic testing /
- Plate /
- Lamb wave /
- Dispersion compensation /
- Group velocity /
- Phase velocity

[1]	杜功焕,朱哲民，龚秀芬.声学基础[M].南京:南京大学出版社,2001,537-540.
[2]	应崇福,张守玉，沈建中.超声在固体中的散射[M].北京:国防工业出版社,1994,16-22.
[3]	郑祥明,赵玉珍,史耀武.兰姆波频散曲线的计算[J].无损检测,2003,25(2):66-68.
[4]	Paul D Wilcox. A rapid signal processing technique to remove the effect of dispersion from guided wavw signals[J]. IEEE Trans. Ultra, Ferroe, Frequency Control,2003,50(4):419-427.
[5]	Wilcox P, Lowe M, Cawley P. The effect of dispersion on longrange inspection using ultrasonic guided waves[J]. NDT﹠E International,2001,34(1):1-9.