CAJ | 학술논문

主要研究了在滑动轴承支承下转子间具有平行不对中故障的柔性联转子系统非线性动力学行为。首先，在考虑到联轴器的连接刚度后，基于两转子间运动的几何关系和位移约束条件推导了在非线性油膜力作用下平行不对中转子系统的动力学模型，理论分析表明该系统是一个含有时变系数和强非线性特征的11自由度非自治系统。然后采用数值方法重点分析了系统的非线性振动特性，例如，系统的轴心轨迹、频谱相应，Poincaré截面等。结果表明：在较低转速时，转子的涡动轨迹在较小的范围内作同步振荡；随着转速的提高，系统出现倍周期分叉现象，以及准周期、混沌运动等复杂的非线性动力学行为。最后讨论了联轴器的连接刚度对系统运动特性的影响。
주요연구료재활동축승지승하전자간구유평행불대중고장적유성련전자계통비선성동역학행위。수선，재고필도련축기적련접강도후，기우량전자간운동적궤하관계화위이약속조건추도료재비선성유막력작용하평행불대중전자계통적동역학모형，이론분석표명해계통시일개함유시변계수화강비선성특정적11자유도비자치계통。연후채용수치방법중점분석료계통적비선성진동특성，례여，계통적축심궤적、빈보상응，Poincaré절면등。결과표명：재교저전속시，전자적와동궤적재교소적범위내작동보진탕；수착전속적제고，계통출현배주기분차현상，이급준주기、혼돈운동등복잡적비선성동역학행위。최후토론료련축기적련접강도대계통운동특성적영향。
The dynamic behaviors of a flexible multi-rotor system supported on journal bearing with a misaligned coupling were investigated.Firstly,the dynamic model of a rotor system under the action of the nonlinear oil film forces was developed after taking into account the movement relationships and displacement constraint,which de-scribes the misalignment relation between two rotors,and the theoretical analysis reveals that the system with e-leven DOF is of strong nonlinear properties and time-varying parameter.Then,the nonlinear dynamic characteris-tics,such as steady state response,rotor orbit,Poincaré section and the largest Lyapunov exponent,were stud-ied.The results show that,at low speed,the orbit synchronously oscillates within a small zone;as the speed in-creases,the dynamic characteristics become complicated,and the period doubling,quasi-period and chaotic os-cillations occur.Finally,the effects of the bolt stiffness on dynamic behaviors were also discussed.