Two step method for damage location and intensity detection Using Wavlete Transform and Modal analysis

Rajabian, Pooya (2017) Two step method for damage location and intensity detection Using Wavlete Transform and Modal analysis. Masters thesis, University of Mohaghegh Ardabili.

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Text (روش دو مرحله‌ای در تشخیص آسیب با استفاده از تبدیل موجک و آنالیز مودال) Pooya Rajabian.pdf Download (926kB) | Preview

Abstract

Damage detection and estimation in structure is one of the most important problems in civil engineering that in association with evaluation and use of structure. We aim with use of two step method to detect damage and define its intensity. In this research we intend use of wavelet transform in order to detecting damage. This method is kind of signal processing that is more effective especially in early stages. Wavelet transform is a mathematical transform that if operate on certain function or signal Significantly strengthens, discrete points or places with abrupt changes, no matter how much small.So, first of all, numerical structral models consist of simple and complex model, 10story Shear frame and 31-element Truss are made in MATLAB workspace and their time history responses with use of Modal analysis and Newmark numerical Method are obtained. Then responses signal with appropriate choise of mother wavelet function and in different scales are analayzed by Continiuos Wavelet Transform (CWT) and then with a proper index, the location of damage is determined.Finally, in order to determining the intensity of damge, defined objective function by using optimization algoritms caused determine the intensity and also location of damage accurately.

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