兰姆波质点振动位移对检测灵敏度的影响

基金项目:

湖北省自然科学基金(2004ABA019)；湖北省教育厅项目(2004D009)；宁波市自然科学基金(2006A610025)

详细信息

Effects of Vibration Displacement on the Detection Sensitivity of Lamb Waves

摘要: 为了探索兰姆波检测中敏感模式的选择与质点振动位移之间的关系，采用单发单收方式，对金属薄板中分层缺陷进行了兰姆波无损检测。运用时频分析方法，对有无缺陷时的时域信号进行了研究。结果表明，兰姆波检测的敏感性与其在板中的质点振动位移存在对应关系。
- 兰姆波检测 /
- 敏感模式 /
- 时频分析
Abstract: To research the relationship between the sensitivity of Lamb modes and the vibration displacement, the artificial delamination defects were made in steel sheet and tested nondestructively by Lamb waves in pulse-echo method. The time domain signals, obtained from the defect-free plate and the defected ones, respectively, were analyzed by time-frequency analysis, the result showed there was a good corresponding relationship between the sensitivity of Lamb modes and the vibration displacement.
- Lamb wave testing /
- Sensitive mode /
- Time-frequency analysis

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