大型泵站水泵机组转子轴系实验模态分析  

Experimental modal analysis of rotor shaft system for pump units of large pumping station

作　　者：王兵 尹晓东 孙世杰 WANG Bing;YIN Xiaodong;SUN Shijie(Shandong Water Diversion Project Operation and Maintenance Center Penglai Management Station,Laizhou 261400,China;Luyuan Water Affairs Co.,Ltd.,Weifang 261000,China)

机构地区：[1]山东调水工程运行维护中心莱州管理站,山东莱州261400 [2]鲁鸢水务有限公司,山东潍坊261000

出　　处：《水利建设与管理》2023年第10期42-48,共7页Water Conservancy Construction and Management

摘　　要：为探究机组异常振动原因,采用锤击法激励对机组转子轴系进行实验模态测试分析,得到机组转子轴系前5阶模态参数。结果表明,第3阶模态频率与机组工作转速十分接近,极易产生共振,建议采取优化减振措施,避免固有频率落在工作频率10%范围内。传递函数相干分析和MAC矩阵校验结果均表明,实验模态测试和分析结果合理可靠。建议确保设备安装质量,避免激励频率与系统某阶固有频率接近,产生共振。In order to explore the causes of abnormal vibration in the units,experimental modal testing and analysis of the rotor shaft system is conducted using the impact excitation method.The first five mode parameters of the rotor shaft system are obtained.The results indicate that the frequency of the third mode is very close to the operating speed of the unit,making it prone to resonance.It is recommended to implement optimized damping measures to prevent the natural frequency from falling within a 10%range of the operating frequency.Coherence analysis of transfer functions and validation of the MAC matrix both suggest that the experimental modal testing and analysis results are reasonable and reliable.It is advised to ensure the quality of equipment installation and avoid resonance by preventing excitation frequencies from approaching the natural frequencies of the system’s modes.

关 键 词：转子 共振 实验模态分析 

分 类 号：TV68[水利工程—水利水电工程]