Journal
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
Volume 90, Issue -, Pages 44-63Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ymssp.2016.12.005
Keywords
Aircraft composite structure; Structural health monitoring; Impact imaging; Guided wave; Spatial-wavenumber filter
Categories
Funding
- National Natural Science Funds for Distinguished Young Scholars Grant [51225502]
- National Natural Science Foundation [51635008]
- Aviation Foundation [20140952010]
- State Key Laboratory of Mechanics and Control of Mechanical Structures [0515Y01]
- Fundamental Research Funds for the Central Universities [NE2016001]
- Hong Kong Scholars Program
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Qing Lan and Young Elite Scientist Sponsorship Program by CAST of China
Ask authors/readers for more resources
Monitoring of impact and multi-impact in particular in aircraft composite structures has been an intensive research topic in the field of guided-wave-based structural health monitoring (SHM). Compared with the majority of existing methods such as those using signal features in the time-, frequency- or joint time-frequency domain, the approach based on spatial-wavenumber filter of guided wave shows superb advantage in effectively distinguishing particular wave modes and identifying their propagation direction relative to the sensor array. However, there exist two major issues when conducting online characterization of multi-impact event. Firstly, the spatial-wavenumber filter should be realized in the situation that the wavenumber of high spatial resolution of the complicated multi impact signal cannot be measured or modeled. Secondly, it's difficult to identify the multiple impacts and realize multi-impact localization due to the overlapping of wavenumbers. To address these issues, a scanning spatial-wavenumber filter based diagnostic imaging method for online characterization of multi-impact event is proposed to conduct multi-impact imaging and localization in this paper. The principle of the scanning filter for multi-impact is developed first to conduct spatial-wavenumber filtering and to achieve wavenumber-time imaging of the multiple impacts. Then, a feature identification method of multi-impact based on eigenvalue decomposition and wavenumber searching is presented to estimate the number of impacts and calculate the wavenumber of the multi impact signal, and an image mapping method is proposed as well to convert the wavenumber-time image to an angle-distance image to distinguish and locate the multiple impacts. A series of multi-impact events are applied to a carbon fiber laminate plate to validate the proposed methods. The validation results show that the localization of the multiple impacts are well achieved. (C) 2016 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available