Application of the Random Decrement Technique in Damage Detection under Moving Load

Kordestani, Hadi; Xiang, Yiqiang; Ye, Xiao-Wei; Jia, Ya-Kun

doi:10.3390/app8050753

Cited by 24 publications

(36 citation statements)

References 27 publications

(48 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…dµ s into Equation (12). In this way, the entire gradient of the objective function can be successively obtained.…”

Section: Of 17mentioning

confidence: 99%

“…Structural damage identification plays an important role in SHM, which provides a reliable theoretical foundation for monitoring, early warning and safety assessment of large-scale structures [1]. In recent years, many effective methods for SHM [2][3][4][5][6][7] and structural damage identification [8][9][10][11][12][13] have been presented. However, it is still difficult to identify the extent of structural damage accurately, and one of the reasons is a limited number of measurement points in large-scale structures.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An Improved Objective Function for Modal-Based Damage Identification Using Substructural Virtual Distortion Method

et al. 2019

View full text Add to dashboard Cite

Damage identification based on modal parameters is an important approach in structural health monitoring (SHM). Generally, traditional objective functions used for damage identification minimize the mismatch between measured modal parameters and the parameters obtained from the finite element (FE) model. However, during the optimization process, the repetitive calculation of structural modes is usually time-consuming and inefficient, especially for large-scale structures. In this paper, an improved objective function is proposed based on certain characteristics of the peaks of the frequency response function (FRF). Traditional objective functions contain terms that quantify modal shapes and/or natural frequencies. Here, it is proposed to replace them by the FRF of the FE model, which allows the repeated full modal analysis to be avoided and thus increases the computational efficiency. Moreover, the efficiency is further enhanced by employing the substructural virtual distortion method (SVDM), which allows the frequency response of the FE model of the damaged structure to be quickly computed without the costly re-analysis of the entire damaged structure. Finally, the effectiveness of the proposed method is verified using an eight-story frame structure model under several damage cases. The damage location and extent of each substructure can be identified accurately with 5% white Gaussian noise, and the optimization efficiency is greatly improved compared with the method using a traditional objective function.

show abstract

“…dµ s into Equation (12). In this way, the entire gradient of the objective function can be successively obtained.…”

Section: Of 17mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Improved Objective Function for Modal-Based Damage Identification Using Substructural Virtual Distortion Method

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The proposed method is independent of the difference in the loading weight before and after damage and this performance is verified using numerical and experimental examples in this study. In addition, combining with structural health monitoring technique [28], the proposed method is applied to detect the damage of bridge under the load-moving excitation [29,30].…”

Section: Introductionmentioning

confidence: 99%

Damage Detection in Beam Bridges Using Quasi-static Displacement Influence Lines

Zhang

Liu

2019

Applied Sciences

View full text Add to dashboard Cite

Quasi-static strain influence lines (ILs) based on the Brillouin optical time domain analysis (BOTDA) technique have been proposed to effectively locate damage in beam bridges. Using measurement points with a high spatial resolution, the BOTDA technique supplies enough strain ILs to help detect damage in bridges. Unlike quasi-static strain ILs based on the BOTDA technique, quasi-static displacement ILs are relatively easy to implement in actual bridges; furthermore, only a few quasi-static displacement ILs are necessary for actual bridges. On this basis, an improved method is proposed to determine the existence of damage in beam bridges by using only a few quasi-static displacement ILs. First, the Hankel matrix of the damage feature, established based on the number of strain ILs, is reconstructed to generate the damage feature using only a few quasi-static displacement ILs. Second, the method used to obtain the metric for evaluating the damage feature is improved, thereby greatly increasing the efficiency of damage detection using quasi-static ILs. Finally, the effectiveness of the proposed method is demonstrated through both numerical analysis and experimentally measured data obtained during a quasi-static load test of a model bridge.

show abstract

“…Compared with the vibrations of a single beam under moving loads [14][15][16][17], the vibrations of double-beam systems excited by moving loads are more complicated and have drawn much attention recently. The vibrations of a simply supported double-beam system with two identical beams interconnected by an elastic layer under the action of a fixed harmonic force were solved in the closed-form solutions by Vu et al [18].…”

Section: Introductionmentioning

confidence: 99%

Dynamics of Double-Beam System with Various Symmetric Boundary Conditions Traversed by a Moving Force: Analytical Analyses

Yang

Jing

et al. 2019

Applied Sciences

View full text Add to dashboard Cite

Dynamics of the double-beam system under moving loads have been paid much attention due to its wide applications in reality from the analytical point of view but the previous studies are limited to the simply supported boundary condition. In this study, to understand the vibration mechanism of the system with various boundary conditions, the double-beam system consisted of two general beams with a variety of symmetric boundary conditions (fixed-fixed, pinned-pinned, fixed-pinned, pinned-fixed and fixed-free) under the action of a moving force is studied analytically. The closed-form frequencies and mode shapes of the system with various symmetric boundary conditions are presented by the Bernoulli-Fourier method and validated with Finite Element results. The analytical explicit solutions are derived by the Modal Superposition method, which are verified with numerical results and previous results in the literature. As found, each wavenumber of the double-beam system is corresponding to two sub-modes of the system and the two sub-modes associated with the first wavenumber of the system both contribute significantly to the vibration of the system under a moving force. The analytical solutions indicate that the mass ratio, the bending stiffness ratio, the stiffness ratio of contact springs and the speed ratio of the moving force are the factors influencing the vibrations of the system under a moving force. The relationships between these dimensionless parameters and the displacement ratio of the system are investigated and presented in the form of plots, which could be referred in the design of the double-beam system.

show abstract

Application of the Random Decrement Technique in Damage Detection under Moving Load

Cited by 24 publications

References 27 publications

An Improved Objective Function for Modal-Based Damage Identification Using Substructural Virtual Distortion Method

An Improved Objective Function for Modal-Based Damage Identification Using Substructural Virtual Distortion Method

Damage Detection in Beam Bridges Using Quasi-static Displacement Influence Lines

Dynamics of Double-Beam System with Various Symmetric Boundary Conditions Traversed by a Moving Force: Analytical Analyses

Contact Info

Product

Resources

About