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Entropy-based Optimal Sensor Location for Structural Damage Detection

Beck, James L. and Papadimitriou, Costas and Au, Siu-Kui and Vanik, Michael W. (1998) Entropy-based Optimal Sensor Location for Structural Damage Detection. In: Proceedings of SPIE. Vol.3325. SPIE , Bellingham, WA, pp. 161-172.

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A statistical methodology is presented for optimally locating the sensors in a structure for the purpose of extracting from the measured data the most information about the parameters of the model used to represent structural behavior. The methodology can be used in model updating and in damage detection and localization. It properly handles the unavoidable uncertainties in the measured data as well as the model uncertainties. The optimality criterion for the sensor locations is based on information entropy which is a unique measure of the uncertainty in the model parameters. The uncertainty in these parameters is computed by the Bayesian statistical methodology and then the entropy measure is minimized over the set of possible sensor configurations using a genetic algorithm. The information entropy measure is also extended to handle large uncertainties expected in the pre-test nominal model of a structure. In experimental design, the proposed entropy-based methodology provides a rational procedure for comparing and evaluating the benefits of adding more sensors in the structure against the benefits of exciting and observing (measuring) more modes using the existing number of sensors. Simplified models for building and bridge structures are used to illustrate the methodology.

Item Type:Book Section
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Papadimitriou, Costas0000-0002-9792-0481
Additional Information:The paper is based upon work partly supported by the National Science Foundation under subcontract to grant CMS-9503370. This support is gratefully acknowledged
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Subject Keywords:System identification, information entropy, sensors, actuators, model updating, damage detection, buildings, bridges.
Record Number:CaltechAUTHORS:20120926-094216808
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34407
Deposited By: Carmen Nemer-Sirois
Deposited On:31 Oct 2012 22:27
Last Modified:09 Nov 2021 23:08

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