制造误差对盘鼓组合转子模态特性影响分析
Analysis of the influence of manufacturing error on the modal characteristics of disc-drum combined rotor
邹存建 1韩清凯 1张昊 2卢崇劭 3翟敬宇1
作者信息
- 1. 大连理工大学机械工程学院,辽宁大连 116023
- 2. 辽宁工业大学机械工程与自动化学院,辽宁锦州 121001
- 3. 沈阳智振科技有限公司,沈阳 110027
- 折叠
摘要
为了探究制造误差对转子模态特性的影响规律,基于转子动力学和摄动理论对转子模态局部化、振型阶跃和频率转向特性发生机理进行了阐述;从转子装配工程实际出发,采用自定义函数对典型配合面制造误差形式进行表征,并生成点云数据;采用皮肤模型法将制造误差引入到转子有限元模型中,并针对该模型开展了制造误差对其频率转向、振型阶跃以及模态振型局部化特性分析;采用振型位移局部化因子对制造误差引起的转子振动模态局部化程度进行了量化分析.结果表明:当考虑制造误差且达到一定程度时,会诱发转子失谐,导致转子系统刚度发生变化,加剧频率转向特性;同时通过模态置信准则图分析可知,模态振型发生了错位阶跃和顺序阶跃现象;制造误差导致的失谐效应会使振动能量在转子的部分区域进行聚集,使某些在理想模型下落在频率通带的频率在失谐后落到了频率禁带内,出现了模态振型局部化现象;进一步对其量化分析表明,采用振型位移局部化因子能够有效表征振动模态局部化程度.论文研究方法和结果可为复杂转子装配技术提供参考.
Abstract
In order to explore the influence of manufacturing errors on rotor modal characteristics,the mechanisms of rotor modal localization,mode step,and frequency steering characteristics were described based on rotor dynamics and perturbation theory.According to actual rotor assembly engineering,the manufacturing error forms of typical mating surfaces were characterized by user-defined functions,and point cloud data were generated.The skin model method was used for the first time to introduce manufacturing errors into the rotor finite element model,and the characteristics of manufacturing errors on its frequency steering,mode step,and mode localization were analyzed for this model.The mode displacement localization factor was used to quantify the degree of rotor vibration mode localization caused by manufacturing errors.The results showed that when the manufacturing error was considered to a certain extent,it could induce the rotor detuning,leading to the change of the rotor system stiffness and aggravating the frequency steering characteristics;at the same time,through analysis of the mode confidence criterion diagram,it can be seen that the mode shape had the phenomenon of dislocation step and sequence step;the detuning effect caused by manufacturing error could make the vibration energy gather in some areas of the rotor,so some frequencies falling in the frequency pass band of the ideal model may fall into the frequency band gap after detuning,and the phenomenon of mode shape localization occurred;further quantitative analysis showed that the mode displacement localization factor can effectively characterize the degree of vibration mode localization.The research methods and results can provide a reference for complex rotor assembly technology.
关键词
盘鼓组合转子/制造误差/频率转向/振型阶跃/振动模态局部化Key words
disc-drum combined rotor/manufacturing error/frequency steering/mode step/localization of vibration modes引用本文复制引用
基金项目
中国航空发动机集团产学研合作项目(HFZL2019CXY021-1)
出版年
2024
NETL
NSTL
万方数据