Abstract
Chapter 3 illustrates the genetic fuzzy system for structural health monitoring of a beam. The cantilever beam structure is fixed at one end and free at the other and can model airplane wings, helicopter blades, and turbine blades, among other things. A finite element model of the undamaged and damaged beam is used to simulate the damaged system. Damage is introduced in the beam by a localized stiffness reduction in accordance with continuum mechanics theory. A genetic fuzzy system is formulated for the beam structure to find the damage location and size from modal data. Initially, the genetic fuzzy system is developed for a uniform beam. It is shown that the method is robust to noise in the data and to missing measurements. The genetic fuzzy system is then illustrated for a nonuniform beam and for a more refined discretization of the damage locations. It is shown that the architecture of the genetic fuzzy system allows for a simple approach for recreating the pattern recognition algorithms as the measurements and outputs change. For each input-output set, a genetic algorithm is used to maximize the success rate of fault isolation for a set of noisy data. The approach is finally illustrated for a non-rotating helicopter main rotor blade using frequency and mode shape data. It is found that the genetic fuzzy system performs very well for the structural health monitoring of beams.
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© 2011 Springer-Verlag London Limited
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Pawar, P.M., Ganguli, R. (2011). Structural Health Monitoring of Beams. In: Structural Health Monitoring Using Genetic Fuzzy Systems. Springer, London. https://doi.org/10.1007/978-0-85729-907-9_3
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DOI: https://doi.org/10.1007/978-0-85729-907-9_3
Publisher Name: Springer, London
Print ISBN: 978-0-85729-906-2
Online ISBN: 978-0-85729-907-9
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