Uncertainty handling in structural damage detection using fuzzy logic and probabilistic simulation

Chandrashekhar, M and Ganguli, Ranjan (2009) Uncertainty handling in structural damage detection using fuzzy logic and probabilistic simulation. In: Mechanical Systems and Signal Processing, 23 (2). pp. 384-404.

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Abstract

A fuzzy logic system (FLS) with a new sliding window defuzzifier is developed for damage detection. The effect of changes in the damage evaluation parameter (frequency) due to uncertainty in material properties is explored and the results of the probabilistic analysis are used to develop a robust FLS for damage detection. Probabilistic analysis is performed using Monte Carlo Simulation (MCS) on a beam finite element (FE) model to calculate statistical properties of the variation in natural frequencies of the beam due to structural damage and material uncertainty. Variation in these frequency measures, further contaminated with measurement noise, are used for testing the FLS. The FLS developed for damage detection in the steel beam having material uncertainty (elastic modulus) with coefficient of variation (COV) of 3 percent and noise level of 0.15 in the measurement data, correctly identifies the fault with an accuracy of about 94 percent. The FLS also accurately classifies the undamaged condition in presence of the mentioned uncertainties reducing the possibility of false alarms. From an algorithmic standpoint, this paper connects the disparate areas of probability and fuzzy logic to alleviate uncertainty issues in damage detection.

Item Type:	Journal Article
Publication:	Mechanical Systems and Signal Processing
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Damage detection;Fuzzy logic;Frequency;Uncertainty; Material property;Measurement noise.
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	03 Nov 2009 09:17
Last Modified:	19 Sep 2010 05:00
URI:	http://eprints.iisc.ac.in/id/eprint/18167

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