A Hybrid of Interval Wavelets and Wavelet Finite Element Model for Damage Detection in Structures

作者：Xiang, Jiawei^*; Matsumoto, Toshiro; Wang, Yanxue; Jiang, Zhansi

来源：Computer Modeling in Engineering & Sciences, 2011, 81(3-4): 269-294.

• Beam and plate
• interval wavelets
• wavelet Finite element model
• Hybrid approach
• Particle swarm optimization
• Damage detection
• Boundary distortion phenomenon

Damages occurred in a structure will lead to changes in modal parameters (natural frequencies and modal shapes). The relationship between modal parameters and damage parameters (locations and depths) is very complicated. Single detection method using natural frequencies or modal shapes can not obtain robust damage detection results from the inevitably noise-contaminated modal parameters. To eliminate the complexity, a hybrid approach using both of wavelets on the interval (interval wavelets) method and wavelet finite element model-based method is proposed to detect damage locations and depths. To avoid the boundary distortion phenomenon, Interval wavelets are employed to analyze the finite-length modal shape to decompose into approximation and detailed signals. Damage locations will be detected by showing some peaks on the figures of detailed signal. To detect damage depths, the relationship between natural frequencies and damage depths (the damage depth detection database) is constructed using wavelet finite element method. Several natural frequencies obtained by experimental modal analysis are employed as inputs to the constructed database using particle swarm optimization (PSO) to search for damage depths. Numerical examples of beam and plate structures show that the new approach is robust to boundary distortion phenomenon and environment noise.

• 出版日期2011-11
• 单位桂林电子科技大学