耦合故障作用下转子-滚动轴承系统动力学分析及模拟实验研究
发布时间：2018-02-13 09:39
本文关键词： 转子-滚动轴承系统 柔性多体系统动力学控制模型 联合仿真 有限元分析 不平衡-碰摩-不对中耦合故障 转子故障实验 模态实验 出处：《天津大学》2012年硕士论文 论文类型：学位论文
【摘要】：随着科学技术日益发展,各类旋转机械的功率密度越来越大,其结构要求更加紧凑,导致故障发生率也随之增加,而转子系统是旋转机械的核心部件,一旦发生故障,将会造成重大的经济损失甚至人员伤亡,所以开展故障状态下转子-轴承系统动力特性的深入研究存在重要工程应用价值。 本文以航空发动机转子实验台主轴系统为研究对象,以转子动力学与转子故障机理为研究基础,以研究耦合故障状态下主轴系统动力特性为目的,通过调试已搭建航空发动机转子实验台及故障模拟装置,处理分析所得实验数据并验证研究故障转子系统动力特性方法。主要内容如下: 首先对故障转子-轴承系统动力特性分析的必要性进行阐述,针对国内外转子动力学发展、转子故障机理以及转子故障实验现状进行研究,并根据现有理论基础,确定对故障转子-轴承系统的动力特性研究方法。 随后通过有限元方法分析实验主轴系统低频结构动力特性,将所得固有频率和振型与模态试验结果进行对比分析,掌握所研究对象固有结构动力特性并验证所建有限元网格模型可满足工程设计和后续分析的要求。 基于上述工作基础,研究柔性转子-滚动轴承系统在不平衡-碰摩-不对中故障耦合作用下的动力学响应。即运用模态综合法建立柔性多体系统动力学模型,并自行编程建立非线性轴承力、碰摩力与不对中激振力模型,最终得到转子—滚动轴承系统的耦合故障柔性多体系统动力学控制模型。分析对比系统在各种故障耦合作用下的振动特征图。 最后基于航空发动机转子实验台进行实验分析,通过设置典型机械故障模拟系统并设计耦合故障状态下转子实验方案,进行实验台振动测试,对实验数据进行对比分析和处理。 本文将柔性多体动力分析与数值计算联合仿真法应用于建立不平衡-碰摩-不对中故障耦合作用下柔性转子-滚动轴承系统动力学模型,进行迭代求解,分析对比系统在各种故障耦合作用下的振动特征图,对典型故障转子振动特征初步掌握;并通过航空发动机转子实验台进行故障状态振动测试,处理所测实验结果,对故障状态下实验台振动特征进行分析,验证该模型耦合各故障力方法的正确性,并且分析当量不对中量与转子系统振动的关系。
[Abstract]:With the increasing development of science and technology, more and more power density all kinds of rotating machinery, its structure is more compact, resulting in the failure rate also increased, while the rotor system is the core component of the rotating machinery, the event of failure, will cause significant economic losses and casualties, so to carry out the study on fault state of rotor the dynamic characteristics of the bearing system has important engineering application value.
In this paper, aeroengine rotor experimental system as the research object, based on rotor dynamics and rotor fault mechanism based on the dynamic characteristics of the spindle system of coupled fault condition has been set up for the purpose of debugging of aeroengine rotor test-bed and fault simulation device, analysis the experimental data and verify the fault of rotor system dynamic the characteristics of methods. The main contents are as follows:
It expounds the necessity of the fault analysis of the dynamic characteristics of rotor bearing system, aiming at the development of rotor dynamics at home and abroad, the research of fault mechanism of rotor and rotor fault experimental situation, and according to the existing theory and research methods of determining dynamic characteristics of fault of rotor bearing system.
Then through the finite element method for dynamic analysis of spindle system experimental low-frequency structure, the natural frequency and vibration model and modal test results were compared and analyzed, grasp the dynamic characteristics of objects and structure and verified the finite element mesh model can meet the engineering design and subsequent analysis.
鍩轰簬涓婅堪宸ヤ綔鍩虹,鐮旂┒鏌旀，
本文编号：1507860
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