引用本文:胡少伟,许毅成,张润,喻江.基于水轮机特征频率的组合长柱振动特性研究[J].水利水运工程学报,2018,(6):10-18
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基于水轮机特征频率的组合长柱振动特性研究
胡少伟1, 许毅成1, 张润1, 喻江1,2
1.南京水利科学研究院,江苏南京;2.河海大学水利水电学院,江苏南京
摘要:
为了有效改善当前水电站厂房整体结构的使用性能与抗震性能,以水电站水轮发电机组运行的特征频率为参数指标,分别对矩形截面空心钢管长柱、圆形截面空心钢管长柱、矩形截面钢-混组合长柱、圆形截面钢-混组合长柱4种模型进行模态分析及共振校核。分析表明,圆形截面钢管混凝土组合长柱的自振频率与振源频率错开度大于20%,能够有效避免共振,具有显著的抗震特性。在此基础上,开展室内足尺寸模型振动特性试验,通过位移响应和加速度响应等力学指标进行对比分析。结果表明,在20 Hz的振源频率下,方截面柱的振动响应小于圆截面柱。上述振动特性分析结果可为水电站厂房柱结构的工程设计提供技术支持。
关键词:  特征频率  组合长柱  模态分析  共振校核  振动特性试验
DOI:
分类号:TV34; TV32+3
基金项目:国家重点研发计划资助项目(2016YFC0401902); 中央级公益性科研院所基本科研业务专项基金资助项目(Y417012)
Analysis of vibration performance of combined long columns based on characteristic frequencies of hydrogenerator
HU Shaowei1, XU Yicheng1, ZHANG Run1, YU Jiang1,2
1.Nanjing Hydraulic Research Institute, Nanjing;2.College of Water Resources and Hydropower Engineering, Hohai University, Nanjing
Abstract:
In order to improve the usability and seismic performance of the structures in hydropower station, taking the characteristic frequency of the hydrogenerator as the key parameter index, the modal analysis and resonance check of 4 models including rectangular hollow steel tube long column, circular section hollow steel tube long column, rectangle section steel composite long column and circular section steel-concrete combined long column are carried out in this study. The analysis shows that the staggering degree between the frequency of the circular section steel-concrete combined long column and the source frequency is greater than 20%, which means that the resonance can be effectively avoided, and this column has remarkable seismic characteristics. On this basis, the tests on the vibration characteristics of the indoor full-scale model are carried out to analyze and compare the mechanical indexes such as displacement response and acceleration response. From the research results it is found that the vibration response degree of the square section column is less than that of the circular section column at the frequency of the vibration source of 20 Hz. The above analysis results of the vibration characteristics given by this paper can provide a case history reference and a technical support for the engineering design of the powerhouse column structures of the hydropower stations.
Key words:  characteristic frequency  composite long column  modal analysis  resonance check  tests on vibration characteristics
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