Nonlinear feature identification of impedance-based structural health monitoring

被引:0
|
作者
Rutherford, AC [1 ]
Park, G [1 ]
Sohn, H [1 ]
Farrar, CR [1 ]
机构
[1] Los Alamos Natl Lab, Engn Sci & Applicat Weap Response Grp, Los Alamos, NM 87545 USA
来源
SMART STRUCTURES AND MATERIALS 2004: SMART STRUCTURES AND INTEGRATED SYSTEMS | 2004年 / 5390卷
关键词
structural health monitoring; piezoelectric materials; impedance method; nonlinearity;
D O I
10.1117/12.540106
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
The impedance-based structural health monitoring technique, which utilizes electromechanical coupling properties of piezoelectric materials, has shown feasibility for use in a variety of structural health monitoring applications. Relying on high frequency local excitations (typically>20 kHz), this technique is very sensitive to minor chances in structural integuity in the near field of piezoelectric sensors. Several damage sensitive features have been identified and used coupled with the impedance methods. Most of these methods are, however, limited to linearity assumptions of a structure. This paper presents the use of experimentally identified nonlinear features, combined with impedance methods, for structural health monitoring. Their applicability to for damage detection in various frequency ranges is demonstrated using actual impedance signals measured from a portal frame structure. The performance of the nonlinear feature is compared with those of conventional impedance methods. This paper reinforces the utility of nonlinear features in structural health monitoring, and suggests that their varying sensitivity in different frequency ranges may be leveraged for certain applications.
引用
收藏
页码:521 / 531
页数:11
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