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| Stability analysis of a journal floating ring hybrid bearing-rotor system |
| GUO Hong,XIA Boqian,SUN Yixiu |
| School of Mechanical Engineering, Zhengzhou University, Zhengzhou 450001, China |
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Abstract A unitized dynamic model for a journal floating ring hybrid bearing-rotor system was established considering floating ring mass and rotor stiffness.The stability criterion for the journal floating ring hybrid bearing-rotor system was derived using Routh-Hurwitz method.The dynamic characteristic coefficients of inner and outer films for a high speed floating ring bearing were calculated with the finite difference method under different operation conditions.Further more the variation of the threshold rotating speed of the bearing-rotor system with floating ring mass and rotor stiffness was acquired.The results showed that the threshold rotating speed of the bearing-rotor system decreases slightly with increase in floating ring mass under different eccentricities; at the same time, the threshold rotating speed of the bearing-rotor system increases quickly with increase in rotor stiffness.The results provided a reference for the overall modeling and stability analysis of floating ring hybrid bearing-elastic rotor systems.
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Received: 07 December 2015
Published: 25 February 2017
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