Abstract：Floating ring seals are an important factor causing rotors unstable. Establishing floating ring seals and rotor transient motion relation, transient hydrodynamic pressure is obtained by FEM, considering thermal effect. Dynamic coefficients are obtained by perturbation method when the seals are locked up and compared with test results. Basing on characteristics of nonlinear friction and numerical calculation, kinetic condition for locked-up of the seals is proposed. Floating ring seals and rotor coupled transient dynamics model is established, taking transient hydrodynamic pressure and friction into consideration, to study movement of the seals and relative factors. The predictions show that under conditions of small eccentricity, the negative cross stiffness is much greater than the direct; the smaller friction and the higher rotor speed are, the smaller eccentricity of locked-up position is; floating ring seals locked at small eccentricity can cause oil-whip instability phenomena in accord with engineering experience.
刘占生1,夏鹏 1，张广辉 1，徐宁1. 浮环密封运动机理及对轴系稳定性的影响[J]. 振动与冲击, 2016, 35(9): 110-116.
Liu Zhansheng 1 Xia Peng 1 Zhang Guanghui 1 Xu Ning 1. Floating ring seals movement mechanism and the influence on the stability of rotor system. JOURNAL OF VIBRATION AND SHOCK, 2016, 35(9): 110-116.
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