Detection of longitudinal cracks in long and short beams using changes in natural frequencies

Thalapil, Jeslin; Maiti, Sukumar

doi:10.1016/j.ijmecsci.2014.03.022

Cited by 25 publications

(12 citation statements)

References 17 publications

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“…Khiem and Toan 10 have proposed a method for calculating the natural frequencies of a multiple cracked beam and detecting unknown number of multiple cracks from the measured natural frequencies. Thalapil and Maiti 11 have developed an analytical method to address both forward problem of determination of natural frequencies knowing the beam and crack geometry details as well as inverse problem of detection of crack with the knowledge of changes in the beam natural frequencies. Both long (EulerBernoulli) and short (Timoshenko) beams have been examined numerically.…”

Section: Literature Reviewmentioning

confidence: 99%

Investigations on Effect of Notch on Performance Evaluation of Cantilever Beams

Gawande¹,

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2017

IJAV

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It is required that any structure must work properly during its service life time. However, due to the internal damage of structures, there may be a chance of breakdown. Therefore, structures require regular costly inspection. During the last few decades, vibration-based fault detection methods are mostly used due to their simplicity for implementation. During operation, all structures are subjected to degenerative effects that may cause initiation of structural fault such as cracks or notch that lead to the disastrous failure or collapse of the structure. It is seen that as crack or notch starts generating, there is a change in natural frequencies. This research work focuses on the examination of these changes, which is useful for identification of notch position. In this paper, the detailed analysis of cantilever beam with and without notch has been done using finite element method with the help of ANSYS and using modern national instruments LabVIEW software. This method provides the information regarding the detection, location, and characterization of the damage in the structure. This paper includes the study of dynamic properties of cantilever beams subjected to free vibration under the influence of notch at different positions along the length.

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Section: Literature Reviewmentioning

confidence: 99%

Investigations on Effect of Notch on Performance Evaluation of Cantilever Beams

Gawande¹,

More²

2017

IJAV

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“…JeslinThalapil, [10] has presented method for detection of longitudinal cracks in long and short beams using changes in natural frequencies. The accuracy of this method for prediction of natural frequencies is illustrated by case studies involving both long and short beams with known longitudinal crack details.…”

Section: The Damping Ratio Increases At Measurable Levelmentioning

confidence: 99%

A Review on Detection of Cracks Present in Composite Cantilever Beam by using Vibration Analysis Technique

P¹,

P.S.²

2017

IJTSRD

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The aim of this paper is to discuss various techniques used by various researchers for vibration based crack detection in cracked composite structures. In aeronautical, mechanical and civil engineering fields various structural systems are likely to damage and deterioration during their working period. So it is very important to find damage and deterioration in structural member by an effective and reliable methodology. Interest in various damage detection methods has considerably increased in last few decades. A local flexibility is introduced in structural member due to the presence of crack that would affect the vibration response of structure. Due to the presence of crack there is reduction in stiffness of structure and increase in damping of the structure. Since there are changes in physical properties there are reductions in natural frequencies and deviation in mode shapes. Therefore by measuring the vibration parameters it is possible to predict crack depth and crack location in structural member. In this paper effect of various parameters like crack depth, crack location on natural frequency of beam is studied. Presence of crack in abeam decreases the natural frequency which is more pronounced when the crack is near the fixed support and the crack depth is more.

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“…They developed an algebric equation which was solved numerically and then coefficients of trigonometric and hyperbolic terms in mode shapes are found using matrices obtained from compatibility conditions at each point of cracks and boundary conditions. Thalapil and Maiti 12 developed an analytical method to address both the forward problem of determination of natural frequencies knowing the beam and crack geometry details as well as an inverse problem of detection of crack with the knowledge of changes in the beam natural frequencies. Both long (Euler-Bernoulli) and short (Timoshenko) beams have been examined numerically.…”

Section: Introductionmentioning

confidence: 99%

Some Investigations on Effect of Notch on Dynamics Characteristics of Cantilever Beams

Gawande¹,

More²

2019

The International Journal of Acoustics and Vibration

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Beams are very important as per engineering applications is concern and it undergoes different type of loading. Because of different type of loadings there may be chance of failure of structures due to generation of notch.Therefore notch depth and its location are the main parameters for the vibration analysis of beams.The notch depth and its position may affect the natural frequency. Hence, it is essential to study the effect of notch depth and its position on modal natural frequency of the beam for the good performance and its safety. This paper work focus on the examination of these changes, which are useful for identification of notch place.The material of the beam is seleced as mild steel. In this work the comprehensive analysis of cantilever beam with and without notch has been done using analytical analysis and finite element method (FEM) with the help of ANSYS and experimentally using modern National Instruments (NI) Lab-view technique. An experimental set up was developed in which a cantilever beam was excited by a hammer and the response was obtained using an accelerometer.This method describes the relation between the various dynamics characteristics as modal natural frequency and notch depth, modal natural frequency with notch location. This paper focus on the study of dynamic properties of cantilever beams subjected to free vibration under the influence of notch at different points along the length.

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Detection of longitudinal cracks in long and short beams using changes in natural frequencies

Cited by 25 publications

References 17 publications

Investigations on Effect of Notch on Performance Evaluation of Cantilever Beams

Investigations on Effect of Notch on Performance Evaluation of Cantilever Beams

A Review on Detection of Cracks Present in Composite Cantilever Beam by using Vibration Analysis Technique

Some Investigations on Effect of Notch on Dynamics Characteristics of Cantilever Beams

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