Impact of short-duration acceleration records on the ability of signal processing techniques to derive accurate bridge frequencies

Title: Impact of short-duration acceleration records on the ability of signal processing techniques to derive accurate bridge frequencies
Authors: Feng, Kun
González, Arturo
Casero, Miguel
Permanent link: http://hdl.handle.net/10197/10120
Date: 30-Aug-2018
Online since: 2019-04-24T10:57:13Z
Abstract: This paper envisions a scenario in which unmanned aerial vehicles gather data from low-cost and flexible wireless sensor networks, i.e., accelerometers. However, flight duration, coupled with limited sensor battery time, is a substantial technical limitation. In order to assess the impact of these constraints on bridge monitoring, this paper analyses the extraction of bridge dynamic features from short-duration acceleration records. The short acceleration record is simulated using the theoretical response of a simply supported beam subjected to a moving load. Estimated frequencies are obtained in free vibration and compared with the natural frequencies calculated from formula. Given that short records limit the resolution in the frequency domain, the error in the prediction of frequencies will typically decrease as the duration of the signal increases. Signal processing techniques for extracting dynamic features include the Fast Fourier Transform, Frequency Domain Decomposition, Continuous Wavelet Transform and Hilbert-Huang Transform. This paper carries out an assessment of the accuracy of these signal processing techniques in extracting frequencies as a function of the duration of the measurements. Edge effects and loss of resolution are shown to remain key issues to be addressed when the duration of the signal is too short.
Funding Details: Science Foundation Ireland
Type of material: Conference Publication
Publisher: CERAI
Keywords: Short duration recordsAccelerationFrequencyStructural health monitoringBridge dynamics
Other versions: http://www.cerai.net/
Language: en
Status of Item: Peer reviewed
Is part of: Proceedings of the Civil Engineering Research In Ireland Conference (CERI 2018)
Conference Details: The 2018 Civil Engineering Research in Ireland Conference (CERI 2018), Dublin Ireland, 29-30 August 2018
Appears in Collections:Critical Infrastructure Group Research Collection
Earth Institute Research Collection
Civil Engineering Research Collection

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