| 基于两步小波变换的管道损伤识别 |
| |
| 引用本文： | 程良彦,王志华,张伟伟,马宏伟.基于两步小波变换的管道损伤识别[J].暨南大学学报,2008,29(1):7-10. |
| |
| 作者姓名： | 程良彦 王志华 张伟伟 马宏伟 |
| |
| 作者单位： | 1. 暨南大学理工学院,重大工程灾害与控制教育部重点实验室,广东,广州,510632
2. 北京理工大学爆炸科学与技术国家重点实验室,北京,100081;太原理工大学应用力学研究所,山西,太原,030024 |
| |
| 基金项目： | 国家自然科学基金
,
广东省科技攻关计划
,
广东省高校自然科学重点研究项目 |
| |
| 摘 要： | 鉴于信号提取位置的不确定性,研究了信号提取位置对损伤识别的影响.对管道进行数值模拟,提取前两阶径向和切向位移模态.对轴向节点的径向位移模态进行小波变换,小波系数的模极大值反映了损伤的轴向位置;继续对环向节点的切向模态进行小波变换,通过模极大值来识别环向损伤位置;最后讨论了轴向损伤处节点径向位移的小波系数模极大值变化规律.结果表明:两步法可以有效识别损伤位置,轴向位置不含损伤时位移模态的小波系数能显示损伤的轴向位置但小波系数有所减少.
|
| 关 键 词： | 损伤检测 管道模态 小波变换 |
| 文章编号： | 1000-9965（2008）01-0007-04 |
| 收稿时间： | 2007-10-25 |
| 修稿时间： | 2007年10月25 |
Damage identification of pipe based on two-stage wavelet transform method |
| |
| CHENG Liang-yan,WANG Zhi-hua,ZHANG Wei-wei,MA Hong-wei.Damage identification of pipe based on two-stage wavelet transform method[J].Journal of Jinan University(Natural Science & Medicine Edition),2008,29(1):7-10. |
| |
| Authors: | CHENG Liang-yan WANG Zhi-hua ZHANG Wei-wei MA Hong-wei |
| |
| Abstract: | Due to uncertainty of location acquiring signal, the effect of acquired signal location on the damage detection is investigated. The first two order radial and tangent displacement modes of pipe are acquired. The sudden change of wavelet coefficient, which is transformed by radial displacement mode of axes nodes with bior wavelet, shows the axes location of damage. The tangent displacement mode of the circular mode at the axes damage location is analyzed and transformed by the same family wavelet. The circular damage location can be determinated by using the same procedure. The results shown that the two-stage procedure enables the identification of correct damage location. When there is no damaged axes node, the wavelet coefficients of axes nodes can identify the damage location and can be decreased in number. |
| |
| Keywords: | damage identification pipe modes wavelet transform |
| 本文献已被 维普 万方数据 等数据库收录！ |
|
