Experimental detection of sudden stiffness change in a structural system employing Laser Doppler Vibrometry

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dc.contributor.author Jaksic, Vesna
dc.contributor.author Pakrashi, Vikram
dc.contributor.author Basu, Biswajit
dc.contributor.author Ryan, Kevin
dc.date.accessioned 2016-05-20T09:58:11Z
dc.date.available 2016-05-20T09:58:11Z
dc.date.issued 2012-06
dc.identifier.citation Jaksic V., Pakrashi V. Basu B. and Ryan K. (2012) “Experimental detection of sudden stiffness change in a structural system employing Laser Doppler Vibrometry”, 5th European Conference on Structural Control, Genoa, Italy, 18-20 June. en
dc.identifier.startpage 1 en
dc.identifier.endpage 8 en
dc.identifier.uri http://hdl.handle.net/10468/2593
dc.description.abstract Sudden changes in the stiffness of a structure are often indicators of structural damage. Detection of such sudden stiffness change from the vibrations of structures is important for Structural Health Monitoring (SHM) and damage detection. Non-contact measurement of these vibrations is a quick and efficient way for successful detection of sudden stiffness change of a structure. In this paper, we demonstrate the capability of Laser Doppler Vibrometry to detect sudden stiffness change in a Single Degree Of Freedom (SDOF) oscillator within a laboratory environment. The dynamic response of the SDOF system was measured using a Polytec RSV-150 Remote Sensing Vibrometer. This instrument employs Laser Doppler Vibrometry for measuring dynamic response. Additionally, the vibration response of the SDOF system was measured through a MicroStrain G-Link Wireless Accelerometer mounted on the SDOF system. The stiffness of the SDOF system was experimentally determined through calibrated linear springs. The sudden change of stiffness was simulated by introducing the failure of a spring at a certain instant in time during a given period of forced vibration. The forced vibration on the SDOF system was in the form of a white noise input. The sudden change in stiffness was successfully detected through the measurements using Laser Doppler Vibrometry. This detection from optically obtained data was compared with a detection using data obtained from the wireless accelerometer. The potential of this technique is deemed important for a wide range of applications. The method is observed to be particularly suitable for rapid damage detection and health monitoring of structures under a model-free condition or where information related to the structure is not sufficient. en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.relation.ispartof EACS 5th European Conference on Structural Control, 2012.
dc.rights © 2012, The Authors. en
dc.subject Structural damage en
dc.subject Oscillator en
dc.subject SDOF en
dc.subject SHM en
dc.subject Structural Health Monitoring en
dc.subject Single Degree Of Freedom en
dc.title Experimental detection of sudden stiffness change in a structural system employing Laser Doppler Vibrometry en
dc.type Conference item en
dc.internal.authorcontactother Vesna Jaksic, Civil, Structural and Environmental Engineering, University College Cork, Cork, Ireland. +353-21-490-3000 Email: v.jaksic@ucc.ie en
dc.internal.availability Full text available en
dc.date.updated 2015-07-10T13:30:22Z
dc.description.version Accepted Version en
dc.internal.rssid 143406785
dc.contributor.funder Irish Research Council for Science Engineering and Technology en
dc.description.status Peer reviewed en
dc.internal.copyrightchecked No en
dc.internal.licenseacceptance Yes en
dc.internal.conferencelocation Genoa, Italy en
dc.internal.IRISemailaddress v.jaksic@ucc.ie en

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