Experimental Detection of Sudden Stiffness Change in a Structural System Employing Laser Doppler Vibrometry

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Title: Experimental Detection of Sudden Stiffness Change in a Structural System Employing Laser Doppler Vibrometry
Authors: Jaksic, VesnaPakrashi, VikramBasu, BiswajitRyan, Kevin M.
Permanent link: http://hdl.handle.net/10197/10902
Date: 20-Jun-2012
Online since: 2019-07-12T09:27:16Z
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.
Type of material: Conference Publication
Publisher: Erredi Grafiche Editoriali
Start page: 1
End page: 8
Keywords: Laser Doppler VibrometStructural Health Monitoring (SHM)Damage DetectionAccelerometer
Language: en
Status of Item: Not peer reviewed
Is part of: Basso, P., Del Grosso, A.E. (eds.). Smart Structures. Proceedings of the 5th European Conference on Structural Control EACS 2012
Conference Details: EACS 2012: 5th European Conference on Structural Control, Genova, Italy, 18-20 June 2012
ISBN: 9788895023137
Appears in Collections:Mechanical & Materials Engineering Research Collection

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