Vibration Analysis of Rotor using Cracks with Various Depth and Positions

Kannan S; Balaji N; Arun S

doi:https://doi.org/10.14445/22315381/IJETT-V45P281

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Volume 45 | Number 4 | Year 2017 | Article Id. IJETT-V45P281 | DOI : https://doi.org/10.14445/22315381/IJETT-V45P281

Vibration Analysis of Rotor using Cracks with Various Depth and Positions

Kannan S, Balaji N, Arun S

Citation :

Kannan S, Balaji N, Arun S, "Vibration Analysis of Rotor using Cracks with Various Depth and Positions," International Journal of Engineering Trends and Technology (IJETT), vol. 45, no. 4, pp. 428-431, 2017. Crossref, https://doi.org/10.14445/22315381/IJETT-V45P281

Abstract

A strong interest has developed within the past several years in the dynamic behavior of Turbo machinery with cracked shafts. Vibration investigation of a damaged structure is one approach for fault diagnosis. Vibration diagnosis, as a non-destructive detection technique, has recently become of greater importance. Cracks in vibrating component can initiate catastrophic failures. The presences of Cracks change the physical characteristics of a structure which in turn alter its dynamic response characteristics. Therefore there is need to understand dynamics of cracked structures. Crack depth and location are the main parameters for the vibration analysis. A crack on a beam element introduces considerable local flexibility due to the strain energy concentration in the vicinity of the crack tip under load. In the present study, vibration analysis is carried out on a simply supported rotor shaft with open transverse crack, to study the response characteristics. It is verified from simulation analysis that the presence of crack decreases the natural frequency and amplitude of vibration. The mode shapes also changes considerably due to the presence of crack.

Keywords

Vibration investigation, crack, natural frequency, amplitude.

References

[1] M.C. Wu, S.-C. Huang, Vibration and crack detection of a rotor with speed-dependent bearings, International Journal of Mechanical Science, 1998.
[2] Chondros. Identification of cracks in welded joints of complex structures, Journal of Sound and Vibration, 1980.
[3] Darpe, Dynamics of a two-crack rotor, Journal of Sound and Vibration, 2003.
[4] Yang . Crack Identification in vibrating beams using the Energy Method, Journal of Sound and vibration, 2001.
[5] H. Nahvi_, M. Jabbari Crack detection in beams using experimental modal data and finite element model, International Journal of Mechanical Sciences, 2005.
[6] A.S. Sekhar_, A.R. Mohanty, S. Prabhakar , Crack detection by measurement of mechanical impedance of a rotorbearing system, Journal of the Acoustical Society of America,2002.