Main Article Content
In the rotating machinery, the critical speed is one of the most important parameters that must be evaluate. In general, it is very important to determine the critical speed to avoid the breakdown of rotating machine. In this study, the purpose is to investigate critical speed and natural frequency of the rotor bearing system. Firstly, the dynamic characteristics of the rotor are identified. And then, the critical speed of the rotor is evaluated. The finite element model of the rotor is modelled in COMSOL Multiphysics software. The experiment is conducted to determine the natural frequencies of rotor bearing system. In the comparison of natural frequency, the maximum discrepancy is 9.47%which occurs at third mode. The discrepancy between theoretical and numerical simulation results of critical speed is less than 6%. Critical speed analysis is important for stable operation of rotating machine.
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Articles published in JRAME represent the opinions of the author(s) and should not be construed to reflect the opinions of the Editor and the Publisher.
Copyright in the published manuscripts, including the right to reproduce the article in all forms and media, shall be assigned exclusively to the Publisher.
 Wang, JF. and Sun, K. Based on one-dimensional Model to calculate the critical speed, Applied Mechanics and Materials, Vol. 203, 2012, pp. 427-431.
 Tamrakara R. and Mittal N. D. Campbell diagram analysis of open cracked rotor, Engineering Solid Mechanics, Vol. 4, 2016, pp.159-166.
 Zhang, J., Liu, J., Ma, L. and Wang, J. Dynamic analysis of a rotor bearing system with bearing inner-race defect, Shock and Vibration, Vol. 4, 2017, pp. 1-13.
 Muminovic, A.J., Braut, S., Muminovic, A. and Saric, I. Numerical and analytical analysis of elastic rotor natural frequency, TEM Journal, Vol. 3(4), 2018, pp. 323-328.
 Huaitao, S., Jizong, Z., Yu, Z. and Gang, H. Calculation and analysis of critical speed of high-speed motor spindle rotor system, Materials Science and Engineering, Vol. 399, 2018, 012025.
 Lee, C.W. Vibration analysis of rotor, 1993, Springer, Netherlands.
 Akash Rajan, J.K. and Shijukumar, P.K. Dynamic analysis of unbalance in rotating machinery, International Journal of Scientific and Engineering Research, Vol. 5, 2014, pp.1785-1792.