Damage Detection in beam like structures using Frequency Response Function& Iterative Modal Strain Energy Method

Abstract

Structural Health monitoring is an important area of search which finds its application in all load carrying structures like bridges, buildings, aircrafts, submarines, and automobiles. In order to avoid any failure in such structures many Non Destructive Testing Techniques (NDT) are developed and a lot of research is carried in the modern era. Damage Detection using Vibration testing parameters e.g. natural Frequency & mode shapes is one of the most popular reliable approach for damage identification in structures. In this study, a damage detection Techniques is proposed which uses change in Frequency Response Function (FRF) and modal strain energy (MSE) for damage localization and severity estimation in beam and truss like structures.This method provides a robust approach for Structural Health Monitoring (SHM) problems as it requires only few natural Frequencies of damaged structure to detect the damage. In the current approach, a damage detection algorithm is developed and validated by conducting numerical studies of a Cantilever &Fixed-Fixed beam, both noise-free and noise-effected cases are simulated. The numerical studies reveal that proposed method is capable of Localizing and Quantifying the Damage Accurately at reduce computational cost.