径向电磁力激励下的大容量电机结构振动传递特性分析与振动预报

The radial electromagnetic force excitation is one of the major vibration sources in high power motors. It’s of great importance in the design stage to know the vibration transmission properties and to predict the vibration response of high power motors under the radial electromagnetic force excitations. This project will firstly focus on the typical structural joints: stator assembly, plate junctions and bolted joints. The FE modeling method of these typical joints will be investigated using finite element method and experiments. Based on the research of typical structures, accurate FEM models of the radial electromagnetic vibration transmission from stator teeth to the motor seat will be built for middle and low frequency use. The statistical energy analysis (SEA) model will also be built for middle and high frequency use, in which the loss factors matrix is obtained from experimental SEA and analytical derivation. Combined with numerical calculation of electromagnetic forces, the whole-frequency acceleration response of motor seat will be predicted. The radial electromagnetic force excited vibration transmission properties, including energy flow analysis and dominant path analysis, will be studied by commercial SEA software and vibration test. All the experimental works will be carried out on a 600kW motor, a 10kW motor and newly-built typical structural joints. This project will also develop the modeling method of advanced SEA (ASEA) on complex structures such as motor frames, in order to reveal the structure-borne sound transmission phenomenon.

径向电磁力是大容量电机中主要振动源之一，研究径向电磁力激励下的振动传递特性和响应预报对大容量电机减振降噪设计具有重要意义。本项目首先针对大容量电机的典型结构：铁芯结构、筋板结构、螺栓连接件等，采用有限元建模和实验的办法，研究其建模和等效处理方法。在此基础上，建立电磁振动从定子齿部传递到机脚的精确有限元仿真模型，主要用于中低频振动研究。采用理论和实验的办法，获得大容量电机结构子系统间的损耗因子，从而建立大容量电机的统计能量法模型，主要用于中高频振动研究。结合电磁振源的量化计算和能量输入，实现机脚振动加速度全频段的响应预报。结合商业统计能量分析软件和实验测试，开展大容量电机结构振动传递特性分析，研究能量流动分布和主振动传递路径规律。所有的实验测试将在600kW、10kW电机平台、和新建的典型结构件实验平台展开。最后，探索应用高级统计能量法对电机复杂结构进行振动建模分析，研究结构振动传递机理。

电磁振源是电机中主要振动源之一，研究电磁振源激励下的振动传递特性和响应预报对电机减振降噪设计具有重要意义。本项目首先针对电磁振动传递路径上的典型结构：定子铁芯、绕组、转子等结构，采用有限元建模和实验的办法开展振动传递特性研究。在此分析的基础上，建立电磁振动从定子齿部传递到机脚的有限元仿真模型和统计能量法模型，结合电磁振源的量化计算和能量输入，实现电机机脚振动加速度响应预报。研究的重点集中在基于统计能量法的电机结构振动精确高效建模研究和电磁振动预报研究方面。研究结果表明，电机这样的复杂机械结构存在强耦合、非保守、间接耦合的振动传递特点。项目首次将有限元—统计能量法混合建模方法（Hybrid FE-SEA method）引入到电机结构振动建模研究中，并在电机中高频结构振动分析方面进行深入挖掘和研究。该技术发展成为设计阶段的电机结构优化设计和电磁振动预报的关键技术。