Frontiers of Mechanical Engineering >

2011 , Vol. 6 >Issue 2: 203 - 213

DOI: https://doi.org/10.1007/s11465-011-0131-4

RESEARCH ARTICLE

Stability and dynamics of rotor system with 45° slant crack on shaft

  • Yanli LIN ,
  • Xiaohui SI ,
  • Fulei CHU
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  • Department of Precision Instruments and Mechanology, Tsinghua University, Beijing 100084, China

Received date: 19 Jun 2010

Accepted date: 22 Nov 2010

Published date: 05 Jun 2011

Copyright

2014 Higher Education Press and Springer-Verlag Berlin Heidelberg
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Abstract

Crack on a shaft is one of the common damages in a rotor system. In this paper, transverse vibrations are calculated to compare the influences of transverse crack and slant crack on the rotor system. Results show that the vibration amplitude of the rotor system with a 45° slant crack on the shaft is larger than that with a transverse crack when the two types of crack have the same depth and the rotor system runs in the same condition. Stability and dynamic characteristics of the rotor system with a 45° slant crack on the shaft under torsional excitation are analyzed by considering opening and closing of the crack. It is shown that the instability of the transverse vibration of the rotor system increases with increasing difference between the bending stiffness in two main directions, and the vibration is stable when the two bending stiffness are identical. The spectrum analysis of the steady-state response reveals that the gravity and the eccentricity produce different frequency components, and when the two bending stiffness are identical, the multiple frequency components of the torsional excitation disappear. Further investigation shows that the vibration amplitudes in combined frequencies increase rapidly in transversal, torsional, and axial vibration with increasing slant crack depth. The results are helpful for the understanding the dynamic behavior of a rotor system with a slant crack on a shaft and can be used for the detection of the slant crack on a shaft.

Key words： rotor dynamics; slant crack; stability; torsional excitation; open and close

Cite this article

Yanli LIN , Xiaohui SI , Fulei CHU . Stability and dynamics of rotor system with 45° slant crack on shaft[J]. Frontiers of Mechanical Engineering, 2011 , 6(2) : 203 -213 . DOI: 10.1007/s11465-011-0131-4

Acknowledgments

This work was supported by the Natural Science Foundation of China (Grant Nos. 50425516 and 10732060).

References

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