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本文提出了一种以粘弹性材料作轴瓦,从而提高轴承稳定性和减振性的新设想,相应地在理论上构成了滑动轴承小扰动粘弹性流体动力润滑问理。联立求解了在微小简谐扰动下的复数形式的粘弹性变形方程和流体动力润滑方程,在变形计算中利用缩减的柔度矩阵求解三维弹性变形。用超松驰迭代法求解润滑方程和扰动润滑方程,解扰动压力的复振幅分布得油膜-支承面在一定扰动频率下的复合动力特性,经迭代使界限涡动频率与扰动频率达成一致,由此求出稳定性基本参数。此外亦计算了同步涡动下的动特性作为确定油膜减振性的依据,由此获得了共振图谱。结果表明,当用粘弹性材料轴承支撑转子系统时,可使其稳定性和减振性明显提高,这种理论上预示了一条构成轴承优异动力特性的新途径。
In this paper, a new idea of using viscoelastic material as bearing bush to improve the bearing stability and damping performance is proposed. In theory, the small perturbed viscoelastic hydrodynamic lubrication of sliding bearings is formed. The complex forms of viscoelastic deformation equations and hydrodynamic lubrication equations are solved simultaneously with small harmonic disturbances, and the reduced flexibility matrix is used to solve the three-dimensional elastic deformation. The over-relaxation iterative method is used to solve the lubrication equation and perturbation lubrication equation. The complex amplitude distribution of the disturbance pressure is obtained by the super-relaxation iteration method. The complex dynamic characteristics of the oil film-bearing surface at a certain disturbance frequency are agreed, and the boundary whirling frequency and disturbance frequency are agreed by This determines the basic stability parameters. In addition, the dynamic characteristics under synchronous eddy were also calculated as the basis for determining the damping of the oil film, and the resonance spectrum was obtained. The results show that when the rotor system is supported by a viscoelastic material, the stability and damping of the rotor system can be significantly improved. This theory predicts a new way of forming excellent dynamic characteristics of the bearing.