In this thesis , a multi - disk rotor supported by two plain journal bearings is used for the numerical and experimental studies . the one aim is to analyze the nonlinear dynamic characteristics of the rotor system under different varying parameters ; the methods of online elimination of the oil whip and subharmonic vibration are developed and studied also . besides the expression of the nonlinear oil film force is proposed , so that the unbalance of the nonlinear rotor system may be identified online 作者在总结了前人大量的有关非线性振动研究工作的基础上，确立了本文的研究目标：一是以工程应用为背景，研究转子-轴承系统由非线性油膜力引起的非线性振动特性以及各种影响因素，力图通过对转子-轴承系统非线性振动特性的分析，找到切实可行的在线消除油膜振荡的办法；二是研究非线性油膜力的表达方法式，使非线性转子系统的不平衡量在线识别成为可能。
Furthermore , on the theoretics of the balancing machine and associations with the practicalities of the motorcycle crank , it has reasoned out the test principles and mathematic model of the unbalance mass checking device of the motorcycle engine crank set , which is supported by the new method 提出了新型试验方法所采用试验装置的测试原理和数学模型，并设计出了模型机。模型机正在制造中。第三：得到了一个结论：摩托车发动机曲柄连杆机构的动平衡率等于旋转不平衡量除以往复不平衡量。
