nonlinear damage detection of structure using the sensitivity of time- varying modal parameters

The process of implementing a damage detection strategy for aerospace, civil and mechanical engineering infrastructure is referred to as structural health monitoring (shm). in many cases, damage causes a structure that initially behaves in apredominantly linear manner to exhibit nonlinear response when subject to its operating environment. the formation of cracks that subsequently open and close under operating loads is an example of such damage. in this study, an attempt is made to propose a practical method for nonlinear damage detection of structure using the sensitivity of time-varying modalparameters. the results are then verified by different damage scenarios. the influence of the ambient noise is also presented by simulating different degrees of noise in the modal data. as a result of the proposed methodology, location and severity of damage is obtained with high accuracy. the obtained results indicated that the presented methodology is a reliable approach for evaluating and estimating nonlinear damage detection with high degree of noise.