双跨轴承转子系统稳健性运行评价研究

发布时间：2018-06-20 17:38

本文选题：双跨轴承转子系统 + 非线性动力学　；参考：《北京信息科技大学》2015年硕士论文

【摘要】：根据旋转机械关键设备安全运行的保障水平和预知维护的需求，以及现代测控技术教育部重点实验室的主要研究领域，依托实验室北京市青年英才计划项目（71A1411128），以典型双跨轴承转子系统为研究对象，开展其运行状态机理的理论研究进而实现系统的稳健性运行评价。具体研究内容如下：（1）建立了双跨轴承转子系统非线性动力学模型。分析旋转机械的系统构成、运行特点及常见运行状态，以大型旋转机械为原型，建立各运行状态下系统的动力学模型，得到转速和偏心量变化时系统的非线性动力学响应，并得到了系统响应的振动波形图、平面相图和Poincaré截面图等。分析表明：建立的模型能够反映出转子系统参数变化过程中响应的演化过程，计算结果有利于开展双跨轴承转子系统稳健性运行评价研究。（2）开展了基于分形维数理论的双跨轴承转子系统运行状态评价理论与方法研究。考虑到系统响应的不规则性和不稳定性，以振动数据为输入，进行系统的运行稳健性研究。应用LabVIEW软件实现了基于分形关联维数与盒维数理论的双跨轴承转子系统稳健性运行评价方法。分析表明：建立的分形维数故障评价方法可以有效地对双跨轴承转子系统进行运行状态评价。（3）进行了双跨轴承转子运行测试与分析系统的开发研究。该系统可以进行模拟与实验两部分的状态评价，在系统内部以模块化的形式存在，包括参数设置、数据分析、数据采集以及模型评价等。该系统对此类轴承转子设备评价提供了相应诊断工具。（4）开展了相关实验研究。针对双跨轴承转子实验台特定运行状态，进行了单一故障、耦合故障条件下的实验研究，并进行系统理论模型和稳健性运行评价方法验证。分析表明：在测试情况相同的条件下正常运转时的关联维数值最大，碰摩运行时关联维数明显下降，不平衡与基础松动运行时的关联维数值略有下降；正常运转时的盒维数值最小，不平衡故障对系统的盒维数值影响不明显，碰摩运行时的盒维数明显升高。通过建立基于分形关联维数与盒维数理论的双跨轴承转子稳健性运行评价系统能准确真实的反应系统运行状态。最后，双跨轴承转子测试系统的功能有待进一步完善，需要大量的实验和数据的采集与分析，以便进一步提高诊断模型的应用价值。
[Abstract]:According to the guarantee level of the safe operation of the key equipment of rotating machinery and the requirement of predictive maintenance, as well as the main research fields of the key laboratory of the Ministry of Education of the Ministry of Modern Measurement and Control Technology, Based on the laboratory project 71A1411128, the typical double-span bearing rotor system is taken as the research object, and the theoretical research on the mechanism of its running state is carried out to realize the robust operation evaluation of the system. The main contents are as follows: 1) the nonlinear dynamic model of two-span bearing rotor system is established. This paper analyzes the system structure, running characteristics and common running state of rotating machinery. Taking large rotating machinery as prototype, the dynamic model of the system under each running state is established, and the nonlinear dynamic response of the system is obtained when the rotational speed and eccentricity change. The vibration waveform diagram, plane phase diagram and Poincar 茅 section diagram of the system response are obtained. The analysis shows that the model can reflect the evolution process of response in the process of parameter change of rotor system. The calculation results are beneficial to the research of robust operation evaluation of double-span bearing rotor system. (2) the theory and method of evaluation of the running state of double-span bearing rotor system based on fractal dimension theory are studied. Considering the irregularity and instability of the system response, the stability of the system is studied by taking the vibration data as input. Based on the theory of fractal correlation dimension and box dimension, LabVIEW software is used to evaluate the robustness of a two-span bearing rotor system. The analysis shows that the established fractal dimension fault evaluation method can effectively evaluate the running state of the two-span bearing rotor system. The system can be used to evaluate the state of simulation and experiment, and exists in the form of modularization, including parameter setting, data analysis, data acquisition and model evaluation. The system provides a diagnostic tool for the evaluation of this kind of bearing rotor equipment. According to the specific running state of the double-span bearing rotor test table, the experimental research is carried out under the condition of single fault and coupling fault, and the system theoretical model and robust operation evaluation method are verified. The analysis shows that under the same test conditions, the correlation dimension of normal operation is the largest, the correlation dimension of rub-impact operation decreases obviously, and the correlation dimension of unbalance and foundation loosening decreases slightly. The value of box dimension is the smallest in normal operation. The influence of unbalanced fault on the value of box dimension is not obvious, but the box dimension of rub-impact operation is obviously increased. Based on the theory of fractal correlation dimension and box dimension, the evaluation system of rotor robustness of double-span bearing can accurately and truly respond to the running state of the system. Finally, the function of the double span bearing rotor test system needs to be further improved, and a large number of experiments and data collection and analysis are needed in order to further improve the application value of the diagnostic model.
【学位授予单位】：北京信息科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH133.3

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