Experimental Detection of Sudden Stiffness Change in a Structural System Employing Laser Doppler Vibrometry
|Title:||Experimental Detection of Sudden Stiffness Change in a Structural System Employing Laser Doppler Vibrometry||Authors:||Jaksic, Vesna; Pakrashi, Vikram; Basu, Biswajit; Ryan, 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Doppler Vibromet; Structural Health Monitoring (SHM); Damage Detection; Accelerometer||Language:||en||Status of Item:||Not peer reviewed||Is part of:||Basso, P., Del Grosso, A.E. (eds.).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|
Show full item record
This item is available under the Attribution-NonCommercial-NoDerivs 3.0 Ireland. No item may be reproduced for commercial purposes. For other possible restrictions on use please refer to the publisher's URL where this is made available, or to notes contained in the item itself. Other terms may apply.