Structural Damage Detection Using PCA and Improved FRF Curvature Method

The rationality of frequency response function (FRF) curvature method instead of curvature modality analysis method for damage detection is demonstrated. An improved frequency response curvature method is proposed. In order to locate structural damage, the method of combining the principal component analysis with ellipse control chart is studied. Improved FRF curvature is the basic variable of this method. The method does not use modal analysis and avoids the error of modal fitting, and it only deals with frequency response function. The result of cantilever experiment shows that the proposed method is effective and feasible.