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Structural Damage Identification Based on Wavelet Packet De-noising and FE Model Updating

Author: TuFei
Tutor: SongGuQuan；ZhangChun
School: Nanchang University
Course: Mechanics
Keywords: Model Updating Wavelet packet noise reduction Data smoothing method Curvature Mode Damage Identification
CLC: O346.5
Type: Master's thesis
Year: 2011
Downloads: 56
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Abstract


In the field of engineering, non-destructive and accurate identification of structural damage is very important, finite element model updating technology provides an efficient, non-destructive, global structural damage identification method. Finite element model updating method to obtain high-precision finite element model for structural response prediction, optimization design, reliability analysis, damage detection and fault diagnosis engineering services, one of the key research in the field of structural engineering. At present, the most mature model correction method based on sensitivity analysis. The amended damage identification based on the model first established the structure of the initial damage finite element model, by differences in the dynamic characteristics of the finite element model and the actual structure, constantly revised model stiffness, mass, damping and other model parameters, improved analytical models and test relevance of the results, and ultimately in the finite element model of the revised local stiffness reduction to indicate the location and extent of structural damage. The finite element model updating method using the measured modal parameter identification damage from a mathematical point of view is a form of inverse problem solving. Inverse problems, however, sensitive to the input of the error, while the measured modal parameters as input parameters, to test error inevitably exists due to the influences of the ambient noise, the instrument accuracy, its accuracy is difficult to satisfy the model correction desired requirements, often leading to Structural damage identification miscarriage of justice or even failure. Model correction method for structural damage identification accuracy vulnerable measured modal noise problem, a structural damage identification method based on wavelet packet noise reduction and finite element model updating. In each iteration of the damage identification, structural finite element model as a benchmark, consider the real modal and modal noise in the frequency domain differences measured modal finite element model calculated the difference between the modal object wavelet packet noise reduction processing; modal parameters of the structural model updating noise reduction processing objective function for finite element model updating, after modified iteration can identify the location and extent of structural damage. In this paper, a multiple injuries three-span continuous beam, for example, the use of the proposed method to identify the location and extent of structural damage. Numerical examples show that the proposed method can significantly improve the finite element model updating method for structural damage identification robustness. This paper uses another method that smooth the data measured modal noise reduction processing, damage identification results show that the method can also improve the finite element model updating method for structural damage identification robustness. Different modal parameters, namely the natural frequency and the curvature mode model modified objective function for damage identification, damage identification results show that the method can identify the location and extent of structural damage.

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CLC: > Mathematical sciences and chemical > Mechanics > Solid Mechanics > Strength theory > Damage theory
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