Novel Method for Structural Damage Identification Using Real Time Monitoring Algorithms

Abstract

Now a days, the scientists and engineers are working in the area of structuralrhealth newlinemonitoring (SHM). In this regard requirement of alternative techniques to maintaining newlinethe systems and structures having more scope. Excessive usage, continuous crack newlinepropagation, wear and tear of machine elements and impact by an external member newlineleads damage in a mechanical and other structural systems. SHM has extensively newlineemerged in making corresponding maintenance decisions as a very good methodology newlineto notice the system s performance, identify defect, evaluate/diagnose the structural newlinehealth condition. Consequently, safety and functionality of structures are significantly newlineenriched when a condition based maintenance procedure based on dynamic responses newlinecan be developed. newlineRandom response signals collected and root mean square (RMS) values of power newlinespectral density(PSD) are calculated for undamaged and damaged structures newlinerespectively, and utilized to determinetthe location of damage. Severity of damage is newlinefound out by damage index method. The method is very useful in real time damage newlineidentification in structures. newlineThe identification of damage in a polymer matrix composites using modal newlineassurancercriterion (MAC) method has been attempted. The MAC method is newlinepreferred due to its non-destructive nature. Several specimens of different proportions newlineand locations of damage are studied. The dynamic study of the hemp reinforced newlinepolyester polymer composite carried out. The results showed that damage of specimen newlinecan be identified using this method. newlineDynamic characteristics of structures based existing structural damage/defect newlineidentification methods are studied and continuous wavelet transform (CWT) based newlinenew method of damagedidentification in beam structures is presented and compared. newlineThe proposed method is numerically verified for isotropic beam model and composite newlinebeam model with different boundary conditions on a simple finite element beam newlinemodel, also experimentally evaluated for isotropic beam model. The results of newlineinvestigation show that th