Modeling and Analysis of Large Order Rotor Systems with Strong Local Nonlinearities

9504321诺亚建模，分析和表征的多自由度转子系统的动态行为与强非线性是本研究项目的推力。建立了转子及其非线性支承和耦合部件的分析模型。转子系统中的局部非线性表现在阻尼器、间隙和流体相互作用中。工业旋转机械的线性化分析不能捕捉其完整的动态特性，基于这种分析的设计可能会导致严重的故障或灾难性的故障。在这个项目中，分析/计算方法被开发用于确定系统的非线性动力学行为，包括它们的周期，准周期和混沌响应和分叉。这些方法包括谐波平衡法、不动点法以及它们的组合。这项研究的结果推进了非线性转子动力学的知识状态，并导致可靠的设计技术的发展，以减轻非线性动力学和混沌的影响。

9504321 Noah Modeling, analysis and characterization of the dynamic behavior of multi-degree of freedom rotor systems with strong nonlinearities is the thrust of this research project. Analytical models of rotors and their nonlinear supports and coupling components are developed. Local nonlinearities in rotor systems are manifested in dampers, clearances and fluid interactions. Linearized analysis of industrial rotating machinery does not capture its full dynamics, and designs based upon such analyses may lead to severe malfunctions or catastrophic failures. In this project analytical/computational methods are developed for determining the nonlinear dynamic behavior of systems, including their periodic, quasi-periodic and chaotic response and bifurcation. These include the harmonic balance method, fixed point method, and their combinations. The results of this research advance the state of knowledge of nonlinear rotordynamics and leads to the development of reliable design techniques to mitigate the effects of nonlinear dynamics and chaos.***