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Modal Analysis and Damage Identification

Author: ChenShi
Tutor: ShiZhiYu
School: Nanjing University of Aeronautics and Astronautics
Course: Engineering Mechanics
Keywords: Modal parameter identification Damage diagnosis LabView module development ASCE Benchmark Wavelet packet energy spectrum
CLC: TU312.3
Type: Master's thesis
Year: 2010
Downloads: 149
Quote: 1
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Abstract


Large engineering structure during its service , due to corrosion , fatigue , collision , earthquakes and harsh environment loads , damage is inevitable , therefore , it is particularly important to conduct a security assessment of structural damage modal parameter identification and damage diagnosis one of the core issues . This paper studies the following two parts : \Identification of modal parameters can be divided into the experimental modal analysis and operational modal analysis, the paper systematically describes the method of experimental modal parameters identification of the peak (PP) method , orthogonal polynomials , admittance circle method , ITD method , eigensystem realization algorithm (ERA) has carried out a detailed derivation and research . Using LabView language developed four methods corresponding experimental modal parameters identification module , so have a good instrument of the man-machine interface . Finally, a simulation example are several ways to the correctness and accuracy of the module . Through research and numerical examples show that the modal parameters is not sensitive to the damage directly for injury diagnosed with a certain degree of difficulty , but the use of the modal parameters can construct a sensitive indicator of injury . This article damage diagnosis methods include : damage diagnosis method based on vibration test : the curvature mode indicators, indicators modal flexibility and modal strain energy indicators ; energy spectrum and wavelet packet , damage diagnosis method . Damage sensitivity of these methods , damage of positioning capabilities , noise sensitivity , whether requiring complicated aspects of performance such as the finite element model was studied . Comprehensive consideration of various factors : wavelet packet energy spectrum indicators apply to environmental incentives under the large-scale structure of the injury determination ; NExT technology combined with wavelet packet energy spectrum indicators under ambient excitation applied to the ASCE Benchmark model obtained good injury determination effect.

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CLC: > Industrial Technology > Building Science > Building structure > Structure theory to calculate > Structural loads and structural capacity > Structural damage and accident analysis
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