Accuracy of instantaneous frequencies predicted by the Hilbert-Huang transform for a bridge subjected to a moving vehicle

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Title: Accuracy of instantaneous frequencies predicted by the Hilbert-Huang transform for a bridge subjected to a moving vehicle
Authors: Casero, MiguelGonzález, ArturoCovián, E.
Permanent link: http://hdl.handle.net/10197/12145
Date: 2-Jul-2020
Online since: 2021-05-11T12:11:58Z
Abstract: This paper investigates the accuracy of the Hilbert-Huang transform (HHT) in capturing the time-varying frequencies of a short-span bridge traversed by a vehicle travelling at a constant speed. The bridge and vehicle are modelled as a simply supported beam and a quarter-car, respectively. The HHT uses empirical mode decomposition to divide the original signal into mono-component signals, called intrinsic mode functions (IMFs), where the Hilbert transform can extract instantaneous frequencies (IFs). Each IMF is associated with a dominant frequency band, although mode mixing is possible. In order to improve the predicted frequencies, several filters are applied before and after performing the HHT with a threefold purpose: (i) to remove the static component, (ii) to isolate the first mode of vibration, and (iii) to obtain meaningful and denoised IFs. The influences of a localized stiffness loss in the bridge, different vehicle speeds, and three signal-to-noise ratios on the results are discussed.
Funding Details: Science Foundation Ireland
Type of material: Conference Publication
Publisher: CRC Press
Copyright (published version): 2021 Taylor & Francis
Keywords: Hilbert-Huang transformWAFAHHTWeighted average frequency algorithmFilteringInstantaneous frequenciesBridge dynamicsVehicle-bridge interactionStructural health monitoringMoving load
DOI: 10.1201/9780429279119-220
Other versions: https://www.iabmas2020.org/overview.html
Language: en
Status of Item: Peer reviewed
Is part of: Yokota, H., Frangopol, D.M. (eds.). Bridge Maintenance, Safety, Management, Life-Cycle Sustainability and Innovations: Proceedings of the Tenth International Conference on Bridge Maintenance, Safety and Management (IABMAS 2020), June 28-July 2, 2020, Sapporo, Japan
Conference Details: The Tenth International Conference on Bridge Maintenance, Safety and Management (IABMAS 2020), Sapporo, Japan 28 June -2 July 2020
ISBN: 978-0-367-23278-8
This item is made available under a Creative Commons License: https://creativecommons.org/licenses/by-nc-nd/3.0/ie/
Appears in Collections:Critical Infrastructure Group Research Collection
Earth Institute Research Collection
Civil Engineering Research Collection

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