Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/80610
Title: A wavelet-based despiking algorithm for large data of structural health monitoring
Authors: Xia, YX
Ni, YQ 
Keywords: Signal processing
Spike detection
Spike removal
Structural health monitoring
Wavelet transform
Issue Date: 2018
Publisher: Sage Publications, Inc.
Source: International journal of distributed sensor networks, 2018, v. 14, no. 12 How to cite?
Journal: International journal of distributed sensor networks 
Abstract: The last two decades have witnessed a rapid increase in the applications of long-term structural health monitoring technologies to the civil structures. A wealth of field data has been collected by the structural health monitoring systems. Nevertheless, the mining of information associated with structural condition from the large database is still a great challenge. In the structural health monitoring signals, spikes are commonly encountered anomalies that have large amplitudes and may show complex spatial and temporal patterns. They can introduce significant errors in data-based condition assessment of structures. Particularly, the long-term structural health monitoring data have an extraordinarily large volume. To remove the spikes in it, the algorithm is highly desired to be both automatic and efficient. An unsupervised and fast despiking method is proposed in this article on the theoretical cornerstone of the wavelet transform. This method is implemented by two steps, namely, spike detection and spike removal. The hypothesis testing and algorithm of searching wavelet modulus maxima chain are incorporated into the spike-detection procedure. Thus, the arrival time of the spikes can be identified fast. And then, the spikes are removed by a cross-scale maxima and minima search algorithm based on the maximum overlap discrete wavelet transform, retaining the unaffected information. The inverse transformation is not required in the spike-detection step, which improves the speed of the algorithm. The spike-removal algorithm removes spikes only from their occurrence frequency bands; thus, the unaffected signal components are intact after despiking. The proposed algorithm is demonstrated using three sets of structural health monitoring data collected from a real bridge, comparing with three other approaches, that is, the time-domain method, frequency filter and traditional wavelet method.
URI: http://hdl.handle.net/10397/80610
ISSN: 1550-1329
EISSN: 1550-1477
DOI: 10.1177/1550147718819095
Rights: © The Author(s) 2018
This article is distributed under the terms of the Creative Commons Attribution 4.0 License (http://www.creativecommons.org/licenses/by/4.0/) which permits any use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).
The following publication Xia, Y. X., & Ni, Y. Q. (2018). A wavelet-based despiking algorithm for large data of structural health monitoring. International Journal of Distributed Sensor Networks, 14(12), 2018 is available at https://doi.org/10.1177/15501477188190
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