Journal article
A new surface fractal dimension for displacement mode shape-based damage identification of plate-type structures
Mechanical systems and signal processing, Vol.103, pp.139-161
03/15/2018
Handle:
https://hdl.handle.net/2376/116137
Abstract
•New edge perimeter dimension (EPD) for localization and quantification of damage is proposed.•An EPD-based window dimension locus (EPD-WDL) algorithm is developed.•The fundamental aspects of EPD-WDL algorithm are assessed.
Vibration-based nondestructive testing is an area of growing interest and worthy of exploring new and innovative approaches. The displacement mode shape is often chosen to identify damage due to its local detailed characteristic and less sensitivity to surrounding noise. Requirement for baseline mode shape in most vibration-based damage identification limits application of such a strategy. In this study, a new surface fractal dimension called edge perimeter dimension (EPD) is formulated, from which an EPD-based window dimension locus (EPD-WDL) algorithm for irregularity or damage identification of plate-type structures is established. An analytical notch-type damage model of simply-supported plates is proposed to evaluate notch effect on plate vibration performance; while a sub-domain of notch cases with less effect is selected to investigate robustness of the proposed damage identification algorithm. Then, fundamental aspects of EPD-WDL algorithm in term of notch localization, notch quantification, and noise immunity are assessed. A mathematical solution called isomorphism is implemented to remove false peaks caused by inflexions of mode shapes when applying the EPD-WDL algorithm to higher mode shapes. The effectiveness and practicability of the EPD-WDL algorithm are demonstrated by an experimental procedure on damage identification of an artificially-induced notched aluminum cantilever plate using a measurement system of piezoelectric lead-zirconate (PZT) actuator and scanning laser Doppler vibrometer (SLDV). As demonstrated in both the analytical and experimental evaluations, the new surface fractal dimension technique developed is capable of effectively identifying damage in plate-type structures.
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Details
- Title
- A new surface fractal dimension for displacement mode shape-based damage identification of plate-type structures
- Creators
- Binkai Shi - School of Mechanics and Materials, Hohai University, Nanjing 210098, PR ChinaPizhong Qiao - Department of Civil and Environmental Engineering, Washington State University, Pullman, WA 99164-2910, USA
- Publication Details
- Mechanical systems and signal processing, Vol.103, pp.139-161
- Academic Unit
- Civil and Environmental Engineering, Department of
- Publisher
- Elsevier Ltd
- Identifiers
- 99900548004301842
- Language
- English
- Resource Type
- Journal article