摘要
以丰满水电站重建工程厂房为例,汇总了厂房的主要振源类型及频率特性,并在总结国内外控制标准的基础上,提出了适用本工程的振动控制标准建议值。利用三维有限单元法计算了本电站厂房的自振特性以及在机组振动荷载和流道脉动压力下的振动反应,进行了共振复核和振动反应的分析和评价。结果表明,除尾水管中频涡带与厂房第1阶自振频率遇合外,厂房整体结构的前20阶自振频率与主要振源都保持有足够的错开度。机组振动荷载作用下,厂房结构振动位移、速度和加速度响应幅值均满足控制标准要求。在4种典型工况脉动压力作用下,厂房结构的振动反应也均满足控制标准要求,其中工况4下厂房结构的横向位移和速度最大值远大于其他工况,其原因在于本工况下尾水管内的中频涡带与厂房第1阶自振频率遇合,发生了轻微共振。
By taking the reconstruction project of Fengman Hydropower Station as the study case,the main types of vibration and frequency characteristics of the powerhouse are summarized herein,and then the proposed values for the vibration control standards suitable to the project are put forward as well.The self-vibration characteristics as well as the vibration responses under both the vibrating load of the hydropower unit and the fluctuating pressure of the turbine flow passage are calculated with 3-D finite element method,while the analysis and evaluation on the resonance check and vibration response are carried out.The results show that the first 20 orders of the self-vibration frequency of the whole powerhouse structure are sufficiently staggered with the main vibration sources except that the frequency vortex band in the draft tube is coincided with the first order self-vibration frequency of the powerhouse.Under the vibration load of the unit,the response amplitudes of all the vibration displacement,velocity and acceleration of the powerhouse structure meet the relevant requirements of the control standard.Under the effects of the fluctuating pressures of four typical operation conditions,all the vibration responses of the powerhouse structure meet the relevant requirements of the control standard as well,in which the maximum values of the lateral displacement and velocity of the power house structure under the fourth operation condition are far larger than those under the other operation conditions,which is caused by the slight resonance made by the coincidence between the vortex band in the draft tube and the first order self-vibration frequency of the powerhouse under this operation condition.
作者
王超
张宏战
王宝忠
顾滨
WANG Chao;ZHANG Hongzhan;WANG Baozhong;GU Bin(China Water Northeastern Investigation Design and Research Co.,Ltd.,Changchun 130021,Jilin,China;Dalian University of Technology,Dalian 116024,Liaoning,China)
出处
《水利水电技术（中英文）》
北大核心
2020年第S02期46-51,共6页
Water Resources and Hydropower Engineering
关键词
坝后式厂房
振源
共振
脉动压力
结构分析
三维有限元法
丰满水电站
powerhouse at dam toe
vibration source
resonance
fluctuating pressure
structural analysis
3-D finite element method
Fengman Hydropower Station
作者简介
王超(1973—),男,正高级工程师,硕士,主要从事水利水电工程设计工作。E-mail:609459398@qq.com
