Damage Sensitivity Evaluation of Vibration Parameters Under Ambient Excitation

Moughty, John James; Casas, Joan R.

doi:10.1007/978-3-319-67443-8_21

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…One important group of FEM updating techniques is the perturbation methods (also known as the sensitivity methods). In last few decades, the perturbation methods have been widely used in model updating, [1][2][3][4][5] damage detection, [6][7][8][9][10][11][12][13] structural reanalysis, [14][15][16][17][18][19][20] vibration control, [21][22][23][24][25] nonlinear mechanics, [26][27][28][29][30] and so on. The traditional perturbation techniques are all the linear approximation methods based on the series expansion (Taylor series or Neumann series).…”

Section: Introductionmentioning

confidence: 99%

An improved spectral decomposition flexibility perturbation method for finite element model updating

Yang

Sun

2018

Advances in Mechanical Engineering

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Finite element analysis is the most powerful tool to predict the behavior of a structure in engineering practice. Generally, the initial finite element model must be corrected with experimental data due to its complexity. Thus, it is very necessary to study a finite element model updating method with high precision and high efficiency. To this end, this article presented an improved spectral decomposition flexibility perturbation method for structural finite element model updating. The improvements of the proposed method lie in two aspects. First, using the uniform correction model, the proposed method is more economical in computation than the initial method because the spectral decomposition and reorganization of elemental stiffness matrices can be avoided. Second, using the twice singular-value-truncation method, the proposed method has better performance than the initial method in combating data noise. A beam structure is employed to demonstrate the proposed method for model updating in a noisy environment. It was found that the result obtained by least squares estimate is seriously distorted and the result obtained by the first singular value truncation is also not entirely satisfactory. Only the result obtained by the second singular value truncation is the most stable and accurate. Overall, the improved spectral decomposition flexibility perturbation method is robust and effective in small modification case, large modification case, adjacent modification case, and multiple modifications case. The proposed method may be very useful for structural finite element model updating in the noisy environment.

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Section: Introductionmentioning

confidence: 99%

An improved spectral decomposition flexibility perturbation method for finite element model updating

Yang

Sun

2018

Advances in Mechanical Engineering

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Analysis of Vibration Diagnostic Methods of Metal Structures

Pautova

2021

PoHEI.MB

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Due to the constant machine complexity increasing as well as the requirements imposed on them, the issue of ensuring their reliability is becoming more and more urgent. The main part of any machine is supporting metal structure, which state determines the state of the machine as a whole. This determines the need to diagnose structures in order to prevent failures. At present, the methods of vibration diagnostics are being widely developed, as applied to objects of various industries. Scientists’ research is aimed at studying various types of defects, vibration parameters, methods for detecting defects and assessing the residual life. The article considers the main current trends in the development of vibration diagnostics methods. The sensitivity of the dynamic structure characteristics to the presence of a defect in the form of a crack has been investigated. A finite element analysis of a steel I-beam was performed for various cases of its fixation and crack location. The dependence of the natural frequencies and amplitude-frequency characteristics of the beam on the crack size has been analyzed. It is found that the presence of a defect has the greatest effect on the frequency response of the beam.

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Damage Sensitivity Evaluation of Vibration Parameters Under Ambient Excitation

Cited by 2 publications

References 4 publications

An improved spectral decomposition flexibility perturbation method for finite element model updating

An improved spectral decomposition flexibility perturbation method for finite element model updating

Analysis of Vibration Diagnostic Methods of Metal Structures

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