有限宽轴承-转子系统碰摩的非线性动力学特性

利用通过变分方法得到的有限宽轴承非定常油膜力的解析公式,以有限宽轴承-刚性Je?cott转子为研究对象,在研究其运动特性时,除考虑油膜力外,还考虑碰摩,将这两种非线性因素综合起来,用数值模拟研究系统的非线性动力学行为,借助相图、分岔图、Poincare映射图及频谱图分析系统的运动形态。研究结果表明,随着系统参数的变化,在特定的参数组合下出现了复杂的非线性动力学现象,为解决实际工程系统中遇到的问题,如故障诊断等提供了一定的理论依据。

Nonlinear Dynamical Characteristics of a Finite Journal Bearing-rotor System

In this paper, the analytical formula of the unsteady oil-film force of the finite journal bearing is obtained by the variational approach. The motion characteristics of the finite journal bearingrotor are investigated under the consideration of oil-film force, together with rub-impact. The nonlinear dynamical behaviors are studied through numerical simulations. The motion characteristics are analyzed by phase diagram, bifurcation diagram, Poincare maps and spectrum analysis. Results show that at specific parameter combinations, complexed nonlinear dynamical phenomena appear with the variation of system parameters, which may serve as a reference to solve problems in practical engineering systems.