Structural damage detection using modal test data

Attention is given to a systematic method, based on the stiffness matrix correction technique employing submatrices, that furnishes precise identification of damage-location and extent, when the exact measured modes at every finite element DOF are used. Also given is a procedure which performs damage detection with inaccurate, incomplete measured modes. The stiffness-reduction factor for each submatrix revealing the location and degree of stiffness damage is obtained by a computationally efficient pseudoinverse solution. (O.C.)