平行轴系斜齿轮转子系统频率可靠性及可靠性灵敏度研究

发布时间：2018-01-02 20:14

本文关键词：平行轴系斜齿轮转子系统频率可靠性及可靠性灵敏度研究　出处：《东北大学》2011年硕士论文　论文类型：学位论文

【摘要】：旋转机械包括汽轮机、燃气轮机、发电机、电动机、离心压缩机、水轮机、以及航空发动机等机械设备,它们被广泛的应用于电力、航空、航天、化工、纺织、冶金等重要国民经济领域之中。随着科学技术的进步和现代工业化水平的提高,旋转机械正在朝着大型、高速、自动化的方向发展。这就对旋转机械在工作当中的稳定性、可靠性等问题提出了更高的要求。旋转机械的失效绝大多数是由于转子系统的故障引起的,因此,研究转子的频率的失效概率的敏感性与设计对转子系统安全的影响具有重要意义。本文在总结了国内、外有关转子动力学和频率可靠性灵敏度研究现状的基础上,对相关项目中的转子系统的频率失效敏感参数进行了分析。首先对转子系统进行合理的简化,用有限元的方法对转子系统的临界转速和稳定性进行了初步分析,得到转子系统的各阶临界转速；然后利用神经网络理论并结合可靠性灵敏度求解方法与转子动力学,利用神经网络具有非线性映射和任意函数逼近等功能,将神经网络技术应用于频率可靠性和可靠性灵敏度分析领域,求解频率可靠性及其灵敏度。同时对基本随机变量进行了无量纲化,把可靠性对各个基本随机变量的影响程度的排序,为产品在设计阶段提供了理论参考,有着积极地现实意义和理论价值。
[Abstract]:Rotating machinery includes steam turbines, gas turbines, generators, motors, centrifugal compressors, hydraulic turbines, and aero-engines. They are widely used in power, aviation, aerospace, chemical and textile industries. With the progress of science and technology and the improvement of modern industrialization, rotating machinery is moving towards large and high speed in the important fields of national economy such as metallurgy. The development of automation. This puts forward higher requirements for the stability and reliability of rotating machinery in the work. Most of the failures of rotating machinery are caused by the fault of rotor system, so. It is of great significance to study the sensitivity of rotor frequency failure probability and the influence of design on rotor system safety. This paper summarizes the research status of rotor dynamics and frequency reliability sensitivity both at home and abroad. The frequency failure sensitive parameters of rotor system are analyzed. Firstly, the rotor system is simplified reasonably, and the critical speed and stability of rotor system are analyzed with finite element method. The critical speed of rotor system is obtained. Then using the neural network theory and reliability sensitivity solution method and rotor dynamics, the neural network has the functions of nonlinear mapping and arbitrary function approximation. The neural network technology is applied to frequency reliability and reliability sensitivity analysis, and the frequency reliability and its sensitivity are solved. At the same time, the basic random variables are dimensionless. The ranking of the degree of influence of reliability on each basic random variable provides a theoretical reference for the design stage of the product, which has positive practical significance and theoretical value.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH132.41

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