Detection of crack location and size in structures using wavelet finite element methods

Li, B.; Chen, X.F.; Ma, Jianxun; He, Zong-Syun

doi:10.1016/j.jsv.2004.08.040

Cited by 80 publications

(39 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While the crack is located at the position of 1 3 β = (or 2 3 β = ), the third natural frequency is almost unaffected. Similar observations were reported by Li et al [10].…”

Section: Experimental Validationsupporting

confidence: 92%

“…Figures 15(a) −15(c) shows the plots of the predicted variations of the first three natural frequencies as a function of crack size for some of the crack locations of a free-free beam [9]. Similar to the observations reported by Li et al [10], the present study shows that for all the cases considered, the natural frequencies decrease as the crack sizes increase. For some of the crack locations considered, the frequencies remained unchanged until a certain value of crack size ratio is attained, after which, the frequencies decreases rapidly.…”

Section: Experimental Validationsupporting

confidence: 83%

“…The predicted crack positions and crack sizes are in good agreement with the actual values. It is worth noting that the average error in the crack location predictions is 1.20 and the average error in the crack size predictions is 5.72, which is less when compared to the predictions reported by Li et al [10].…”

Section: Experimental Validationcontrasting

confidence: 57%

See 2 more Smart Citations

Detection of crack location and size in structures using improved damaged finite element

Kalanad¹,

Rao²

2010

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

Abstract. In this paper two-dimensional finite element with an embedded edge crack proposed by Potirniche et al [1] is improved further for crack depth ratios ranging up to 0.9 h ( h is the element depth) and for predicting natural frequency of a cracked beam more accurately. The element is implemented in the commercial finite element code ABAQUS as user element (UEL) subroutine. The accuracy of the UEL is verified by comparing the first natural frequency for the bending mode for several beam cases with different damage locations with available experimental data. Subsequently a methodology to detect crack location and size in conjunction the proposed improved cracked element with is presented for singularity problems like a cracked beam. The frequency response functions, function of crack location and size, are approximated by means of surface-fitting techniques. Measured natural frequencies are used in a crack detection process and the crack location and size can be identified by finding the point of intersection of three frequency contour lines. The experimental data from beams studied by other researchers is employed to verify the accuracy of the proposed methodology in the diagnosis of structural crack faults.

show abstract

“…While the crack is located at the position of 1 3 β = (or 2 3 β = ), the third natural frequency is almost unaffected. Similar observations were reported by Li et al [10].…”

Section: Experimental Validationsupporting

confidence: 92%

Section: Experimental Validationsupporting

confidence: 83%

See 1 more Smart Citation

Detection of crack location and size in structures using improved damaged finite element

Kalanad¹,

Rao²

2010

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

show abstract

“…To overcome the difficulties in traditional finite element method (FEM) for solving crack singular problems, He and co-investigators [262][263][264][265] derived wavelet finite element methods (WFEM). Compared with traditional FEM, WFEM has several advantages for modal analysis of crack problems.…”

Section: Machinery Fault Diagnosis In Chinamentioning

confidence: 99%

Basic research on machinery fault diagnostics: Past, present, and future trends

et al. 2017

View full text Add to dashboard Cite

Machinery fault diagnosis has progressed over the past decades with the evolution of machineries in terms of complexity and scale. High-value machineries require condition monitoring and fault diagnosis to guarantee their designed functions and performance throughout their lifetime. Research on machinery Fault diagnostics has grown rapidly in recent years. This paper attempts to summarize and review the recent R&D trends in the basic research field of machinery fault diagnosis in terms of four main aspects: Fault mechanism, sensor technique and signal acquisition, signal processing, and intelligent diagnostics. The review discusses the special contributions of Chinese scholars to machinery fault diagnostics. On the basis of the review of basic theory of machinery fault diagnosis and its practical applications in engineering, the paper concludes with a brief discussion on the future trends and challenges in machinery fault diagnosis.

show abstract

“…The relationship between the ratio of the two order natural frequencies and damage location of structure is has been discovered in a structure with damage of a single crack in paper [3]. In paper [4], the wavelet finite element method is applied to the modal analysis of singular problems of cracked beams, and the matching pursuit problem in crack identification is transformed into a multidimensional optimization problem. As the key part of the diagnosis method, the identification of modal parameters traditionally relies on the experimental modal analysis method.…”

Section: Introductionmentioning

confidence: 99%

The operation modal analysis of the structure crack fault diagnosis based on pseudo-successive data

Chen¹,

Jin²,

Sheng³

et al. 2017

Vib. proced.

View full text Add to dashboard Cite

Abstract. In order to monitor the crack propagation of the structure in the working state for a long time, an operation modal analysis method based on pseudo-successive data is proposed. The vibration response signals of the cantilever beam under white noise excitation are collected and the modal parameters are extracted by the time-frequency operation modal analysis method based on the complex Morlet wavelet. In comparison with the experimental modal analysis results of hammering method, it is revealed that the error of the time-frequency operation modal analysis method is less than 10 %. By setting cracks of different lengths on the cantilever beam, the vibration response signals are extracted, and the modal parameters are extracted by the operation modal analysis method separately. By comparing those modal parameters above, it is found that the natural frequencies of the second, the fourth and the sixth orders decrease with the increase of the crack depth, and the changes of natural frequencies show the monotonicity. So, it can be used as an index for quantitative identification of crack damage. The pseudo continuous data monitoring signals of crack propagation can be constructed by means of "first discrete, then continuous". The modal parameters changes of the whole crack propagation can be observed in one time plane by means of the operation modal analysis method. Therefore, the effective monitoring and diagnosis of the structure can be completed in case of excessive data of long-time vibration monitoring signals.

show abstract

Detection of crack location and size in structures using wavelet finite element methods

Cited by 80 publications

References 19 publications

Detection of crack location and size in structures using improved damaged finite element

Detection of crack location and size in structures using improved damaged finite element

Basic research on machinery fault diagnostics: Past, present, and future trends

The operation modal analysis of the structure crack fault diagnosis based on pseudo-successive data

Contact Info

Product

Resources

About