期刊
JOURNAL OF SOUND AND VIBRATION
卷 492, 期 -, 页码 -出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jsv.2020.115807
关键词
Rotor balancing; Unbalance identification; Hydrodynamic lubrication; Nonlinear bearings; Rotor dynamics
资金
- Sao Paulo Research Foundation - FAPESP [2015/20363-6, 2018/21581-5, 2018/246000]
This study proposes a balancing identification method that considers nonlinear bearings and avoids trial masses. The theoretical model of a rotor supported by hydrodynamic bearings is obtained using the Finite Element method and the bearing forces are approximated by a fifth order Taylor series expansion. The results show that considering nonlinear bearings can improve machine diagnosis.
Rotating machines are key components in several industrial sectors, mainly, in energy generation. In this way, a rotating component supported on hydrodynamic bearings creates typical problems, being high vibrations amplitudes due to unbalance, one of the most common. To avoid failures and ensure a safe operation, the rotor should be balanced, and influence coefficient methods are usually used. Since balancing by the traditional influence coefficients method requires trial masses, the machine can sometimes experience a long setup time, causing financial losses. Also, this method assumes a linear rotor response that can hamper the balancing procedure for nonlinear situations, which happens when the rotor experiences high vibrational motion. Thus, this work proposes a balancing identification that considers nonlinear bearings and avoids trial masses. For this, a mixed-integer gradient-based optimization is presented. The theoretical model of a rotor supported by hydrodynamic bearings is obtained using the Finite Element method and solving the Reynolds equation. In order to save computational time, the bearing forces are approximated by a fifth order Taylor series expansion. The presented results show that nonlinear bearing consideration can improve the machine diagnosis. (C) 2020 Elsevier Ltd. All rights reserved.
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