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。
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.
出处
《无损检测》
北大核心
2007年第12期694-697,711,共5页
Nondestructive Testing
基金
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)
关键词
兰姆波检测
敏感模式
时频分析
Lamb wave testing
Sensitive mode
Time-frequency analysis
