Vibration-based damage identification in beam structures through wavelet analysis

1 Chapter 1: State of the Art of Vibration-based Structural Damage Identification 3 1.1 Structural monitoring and damage assessement 3 1.2 Intelligent damage identification systems 4 1.2.1 Types of structural damage 5 1.2.2 Damage identification 5 1.2.3 Pattern recognition approach 6 1.2.3.1 Operational evaluation 7 1.2.3.2 Sensor network design 8 1.2.3.3 Data pre-processing 10 1.2.3.4 Feature extraction and data reduction 11 1.2.3.5 Pattern recognition 12 1.3 Damage identification methods 13 1.3.1 Classical nondestructive evaluation methods 13 1.3.2 Vibration-based damage detection methods 13 1.3.2.1 Brief historical background 15 1.3.2.2 Natural frequency based methods 16 1.3.2.3 Mode shape based methods 18 1.3.2.4 Modal strain energy based methods 20 IV Lorenzo Montanari “Vibration-based damage identification in beam structures through wavelet analysis” 1.3.2.5 Dynamically measured flexibility based methods 21 1.3.2.6 Frequency response function based methods 22 1.3.2.7 Model updating based methods 23 1.3.2.8 Nonlinear damage identification methods 29 1.3.2.9 Time-frequency techniques 31 1.3.2.10 Artificial neural network methods 38 1.3.2.11 Genetic algorithm methods 40 Chapter 2: Wavelet Analysis and Damage Identification Methods 43 2.