Abstract
The output error and equation error methods of system identification are compared for their effectiveness in assessing damage in structural systems. Damage is modeled on an element-by-element basis as changes in sectional properties, which then contribute to variations in the terms of the structural stiffness matrix. Both static displacements and eigenmodes of the structure are used in the damage detection process. A rational basis for the proper selection of eigenmodes and loading conditions for the identification process is also presented. Characteristics of the unconstrained optimization design space for the two approaches are discussed in context of their ability to yield the location and extent of damage.
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