引用本文:徐存东,王荣荣,刘辉,丁廉营,温钦钰,史国坤.大型高扬程泵站出水塔结构振动模态分析[J].水利水运工程学报,2015,(6):1-6
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大型高扬程泵站出水塔结构振动模态分析
徐存东1,2, 王荣荣1,2, 刘辉1,2, 丁廉营1,2, 温钦钰1,2, 史国坤3
1.华北水利水电大学水利学院,河南郑州;2.水资源高效利用与保障工程河南省协同创新中心，河南郑州;3.聊城大学建筑工程学院，山东聊城
摘要:
针对大型高扬程泵站出水塔结构在运行过程中存在的振动问题，以甘肃省景泰川电力提灌二期总干六泵站出水塔结构为例，构建ANSYS环境下的泵站出水塔三维有限元仿真模型，在正常工作状态下采用子空间迭代法进行基于环境激励的模态参数辨识，并获取其模态振型，分析了泵站出水塔结构的振动特性。结果表明：该出水塔结构在运行期的基频为9.91 Hz，主振方向为垂直压力管道法线方向；结构的模态振型基本按照横向-竖向-扭转的规律进行，且主要发生在结构中部镂空立柱部位。数值分析结果与现场DASP测试结果基本相符，表明有限元子空间迭代法模拟分析结果有效可靠，实现方便。研究成果能为大型高扬程泵站出水塔的更新改造设计提供理论依据，同时能为灌区水工结构的模态参数辨识提供技术参考。
关键词:  大型泵站出水塔  ANSYS建模  子空间迭代法  模态分析  DASP测试
DOI：
分类号:TV675; TV32+3
基金项目:国家自然科学基金资助项目（51279064;31360204）；河南省教育厅科技创新人才支持计划项目（14HASTIT047）；河南省高校科技创新团队支持计划项目（14IRTSTHN028）；华北水利水电大学2014年大学生创新计划项目(HSCX2004063;HSCX2004064)
Modal analysis of outlet tower of large-scale high lift pumping station
XU Cun-dong1,2, WANG Rong-rong1,2, LIU Hui1,2, DING Lian-ying1,2, WEN Qin-yu1,2, SHI Guo-kun3
1.School of Water Conservancy, North China University of Water Resources and Electric Power，Zhengzhou;2.Collaborative Innovation Center of Water Resources Efficient Utilization and Protection Engineering, Zhengzhou;3.State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian
Abstract:
For the vibration problems of the outlet tower of the large-scale high lift pumping station in the operation process, the outlet tower of the 6th pumping station of the phaseⅡ main line of Jingtaichuan electrical irrigation district in Gansu Province was taken as a typical case study and its three dimensional finite element numerical simulation model was established using the software ANSYS. In its normal operating state, the subspace iteration method was used to identify its modal parameters based on natural excitation and obtain its first 6-order vibration modes, analyzing the vibration modal of the outlet tower. The analysis results show that the base frequency of the outlet tower is 9.91 Hz during the normal operation, and the main vibration direction is perpendicular to the normal direction of the pressure pipelines; and the vibration mode of the outlet tower is fundamentally in accordance with the roles of transverse-vertical-torsion, and mainly at the central hollow column. The numerical analysis results are in good agreement with the DASP-testing results, indicating that the simulation results of the subspace iteration method are valid and reliable. The research results can provide a theoretical basis for the renewal design of the outlet tower of the large-scale high lift pumping station, meanwhile give some technical references for the modal parameters’ identification of the hydraulic structures in the irrigation district.
Key words:  outlet tower of large-scale pumping station  ANSYS modeling  subspace iteration method  modal analysis  DASP test
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