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http://hdl.handle.net/10397/106584
Title: | Impact imaging of aircraft composite structure based on a model-independent spatial-wavenumber filter | Authors: | Qiu, L Liu, B Yuan, S Su, Z |
Issue Date: | Jan-2016 | Source: | Ultrasonics, Jan. 2016, v. 64, p. 10-24 | Abstract: | The spatial-wavenumber filtering technique is an effective approach to distinguish the propagating direction and wave mode of Lamb wave in spatial-wavenumber domain. Therefore, it has been gradually studied for damage evaluation in recent years. But for on-line impact monitoring in practical application, the main problem is how to realize the spatial-wavenumber filtering of impact signal when the wavenumber of high spatial resolution cannot be measured or the accurate wavenumber curve cannot be modeled. In this paper, a new model-independent spatial-wavenumber filter based impact imaging method is proposed. In this method, a 2D cross-shaped array constructed by two linear piezoelectric (PZT) sensor arrays is used to acquire impact signal on-line. The continuous complex Shannon wavelet transform is adopted to extract the frequency narrowband signals from the frequency wideband impact response signals of the PZT sensors. A model-independent spatial-wavenumber filter is designed based on the spatial-wavenumber filtering technique. Based on the designed filter, a wavenumber searching and best match mechanism is proposed to implement the spatial-wavenumber filtering of the frequency narrowband signals without modeling, which can be used to obtain a wavenumber-time image of the impact relative to a linear PZT sensor array. By using the two wavenumber-time images of the 2D cross-shaped array, the impact direction can be estimated without blind angle. The impact distance relative to the 2D cross-shaped array can be calculated by using the difference of time-of-flight between the frequency narrowband signals of two different central frequencies and the corresponding group velocities. The validations performed on a carbon fiber composite laminate plate and an aircraft composite oil tank show a good impact localization accuracy of the model-independent spatial-wavenumber filter based impact imaging method. | Keywords: | Composite structure Impact imaging Lamb wave Linear piezoelectric sensor array Spatial-wavenumber filter |
Publisher: | Elsevier BV | Journal: | Ultrasonics | ISSN: | 0041-624X | EISSN: | 1874-9968 | DOI: | 10.1016/j.ultras.2015.07.006 | Rights: | © 2015 Elsevier B.V. All rights reserved. © 2015. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The following publication Qiu, L., Liu, B., Yuan, S., & Su, Z. (2016). Impact imaging of aircraft composite structure based on a model-independent spatial-wavenumber filter. Ultrasonics, 64, 10-24 is available at https://doi.org/10.1016/j.ultras.2015.07.006. |
Appears in Collections: | Journal/Magazine Article |
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File | Description | Size | Format | |
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Su_Impact_Imaging_Aircraft.pdf | Pre-Published version | 1.16 MB | Adobe PDF | View/Open |
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