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Dynamic Analysis of Transverse Crack in Rotor by Using Finite Element Method


Affiliations
1 Dept., of Mechanical Engg., Eswar College of Engineering, Kesanupalli, Narasaraopet, Guntur, Andhra Pradesh, India
2 Dept., of Mechanical Engg., Eswar College of Engineering, Kesanupalli, , Guntur, Andhra Pradesh, India
     

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Dynamic response analysis of a cracked rotor is attempted. The breathing of crack is accounted using the response dependent breathing crack model. Breathing behavior of the cracked rotor is analyzed and the effects of various parameters on the peak response variation and response of the cracked rotor is studied using time domain and frequency domain and plots. The influence of the presence of transverse cracks in a rotating shaft is analyzed. The crack has opening and closing on dynamic response during operation in the rotor. Initially a simple Jeffcott rotor is analyzed considering the lateral vibration. The dynamic response of the rotor with a breathing crack is evaluated by expanding the changing stiffness of the crack using FEM. and this approach is also based on the fact that the presence of a crack in rotating shaft reduces the stiffness of the structure. This method is applied to compute various parametric studies including the effects of the crack depth and location on the dynamic of a cracked rotor. By using MATLAB commands 'bode', the magnitude for given frequency range is obtained. Also, the Frequency response function is plotted by using command 'loglog'.
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  • Dynamic Analysis of Transverse Crack in Rotor by Using Finite Element Method

Abstract Views: 260  |  PDF Views: 2

Authors

K. Rajasekhar
Dept., of Mechanical Engg., Eswar College of Engineering, Kesanupalli, Narasaraopet, Guntur, Andhra Pradesh, India
T. V. S. R. K. Prasad
Dept., of Mechanical Engg., Eswar College of Engineering, Kesanupalli, , Guntur, Andhra Pradesh, India

Abstract


Dynamic response analysis of a cracked rotor is attempted. The breathing of crack is accounted using the response dependent breathing crack model. Breathing behavior of the cracked rotor is analyzed and the effects of various parameters on the peak response variation and response of the cracked rotor is studied using time domain and frequency domain and plots. The influence of the presence of transverse cracks in a rotating shaft is analyzed. The crack has opening and closing on dynamic response during operation in the rotor. Initially a simple Jeffcott rotor is analyzed considering the lateral vibration. The dynamic response of the rotor with a breathing crack is evaluated by expanding the changing stiffness of the crack using FEM. and this approach is also based on the fact that the presence of a crack in rotating shaft reduces the stiffness of the structure. This method is applied to compute various parametric studies including the effects of the crack depth and location on the dynamic of a cracked rotor. By using MATLAB commands 'bode', the magnitude for given frequency range is obtained. Also, the Frequency response function is plotted by using command 'loglog'.