Fault detection methods using direct stiffness matrix correction formulations for use with laser data

摘要

Abstract: In this paper, direct stiffness correction methods (Berman-Baruch methods) are revisited for use as a tool for localizing structural faults based on spatially dense mode shapes obtained experimentally using laser Doppler velocimeters. Besides the standard Berman-Baruch formulation and a recently proposed iterative formulation which preserves sparsity, three other alternative formulations are proposed by the authors. The methods are evaluated using both numerically simulated and experimental data. The numerical example results (clamped-free beam) show that some of the formulations indicated clearly the fault location. With the experimental example (free-free beam), however, the fault localization wasn't so evident. The experimental modal test was done with conventional instrumentation. The authors expect that better results can be obtained using laser data.!70