Transient modal analysis of nonlinear rotor-bearing systems
Transient modal analysis of nonlinear rotor-bearing systems
复制标题
非线性转子轴承系统的瞬态模态分析
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
E. J. Gunter
中科院分区：
文献类型：
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作者：
R. Armentrout;E. J. Gunter
数字计算资源的最新进展使大型非线性转子-轴承系统的分析在桌面计算环境中变得实用。有了现代的个人计算机和工作站，现在可以对以前由于计算能力的限制而只能近似为线性系统的非线性模型进行大时间的瞬时数值解。本文总结了一种基于模态技术的非线性挤压油膜阻尼器的瞬时转子动力学分析方法。以某型飞机涡扇发动机的非线性不平衡响应预测为例，对挤压油膜阻尼器和轴承支承特性进行了优化。模式方法的效率在300 MHz台式计算机上的典型运行时间不到20分钟。
Recent advances in digital computing resources have made the analysis of large nonlinear rotor-bearing systems practical in a desktop computing environment. With modern personal computers and workstations, it is now possible to perform large time transient numerical solutions of nonlinear models that previously could only be approximated as linear systems due to limitations in computing capabilities. Summarized in this paper is a transient rotordynamic analysis based on modal techniques that incorporates an efficient model for a nonlinear squeeze film damper. An application is presented in which the analysis is used to predict nonlinear unbalance response in an aircraft turbofan engine for the optimization of squeeze film damper and bearing support characteristics. The efficiencies of the modal approach yield typical run times of less than 20 minutes on a 300 MHz desktop computer.