碰摩拉杆转子弯扭耦合非线性动力学响应特性

Nonlinear Dynamic Characteristics of a Rod Rotor with Rub-Impact Faults Under Bending-Torsion Coupling

对碰摩故障状态下拉杆转子轴承系统弯扭耦合的非线性动力学特性进行了研究,建立了两端由滑动轴承支撑的双盘拉杆转子轴承系统模型,基于达朗贝尔原理得到其弯扭耦合的非线性动力学微分方程组,并采用四阶龙格库塔法法对方程组进行求解。结果表明:随着转速的提高,拉杆转子轴承系统的非线性动力学特性越强烈,扭振的影响越不能忽略不计,碰摩力逐渐成为影响拉杆转子轴承系统非线性动力学特性的主要因素。

To study the nonlinear dynamic characteristics of a rod rotor with rub-impact faults under bending-torsion coupling,a model was established for the double-disc rod rotor supported by sliding bearings at both ends,and subsequently the nonlinear dynamic differential equations of the system obtained based on the D’Alembert principle were then solved using fourth-order Runge-Kutta method.Results show that the nonlinear dynamic characteristics of the system intensify with the increase of rotational speed,when the influence of torsional vibration could not be neglected,while the rub-impact force gradually becomes the main factor influencing the nonlinear dynamic characteristics of the rotor.