COMPARATIVE STUDY OF VIBRATION BASED DAMAGE DETECTION METHODOLOGIES FOR STRUCTURAL HEALTH MONITORING

This paper presents a comparative study of vibration based damage detection methodologies for structural health monitoring. Three types of damage detection methodologies namely damage location assurance criterion (DLAC), modal strain energy change (MSEC) and iterative modal strain energy (IMSE) are considered in this study. These methods depend on the modal parameters obtained by performing modal analysis from the healthy and damaged structure. In this study, a two-dimensional truss is selected and a single element is damaged by reducing its stiffness. For the damage cases considered both the damaged element and damage severity is found. The effectiveness of these damage detection algorithms by using the minimal modal parameters is also studied. To perform modal analysis and to automate these damage detection algorithms MATLAB code is developed.