Damage Location Plot: A Non-Destructive Structural Damage Detection Technique

摘要

This paper presents a method to detect structural damage detection using frequency response functions (FRF) obtained from non-destructive vibration tests. It investigates the case of early structural damage in which there is no appreciable change in mass and damping. The resulting change in structural stiffness matrix is reflected in changes of FRF which can be exemplified by the evaluation of damage location vector. This requires the dynamic stiffness matrix of the original undamaged structure and the frequency response curves of the currently damaged structure. In this paper the former is obtained from a finite element model of the virgin structure and the latter are obtained from impact hammer test. The method is applied to a space truss structure and a plate structure. Effects of noise, both numerically simulated and experimental measurement noise are also investigated. Preliminary results show that this method of Damage Location Plot can overcome the problems of coordinate incompatibility and noise.