大型弧形钢闸门流激振动数值计算  

Numerical calculation of flow-induced vibration of large-scale steel radial gate

作　　者：赵兰浩[1] 郑拓 杨校礼[1] ZHAO Lanhao;ZHENG Tuo;YANG Xiaoli(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,Jiangsu,China)

机构地区：[1]河海大学水利水电学院,江苏南京210098

出　　处：《水利水电技术》2020年第6期58-64,共7页Water Resources and Hydropower Engineering

基　　金：国家重点研发计划“水库大坝安全诊断与智慧管理关键技术与应用—大型复杂水工结构性能演化测试装备与智能诊断技术”(2018YFC0407102)。

摘　　要：为研究大型弧形钢闸门在脉动压力作用下的动力特性及安全问题,采用附加质量法计算闸门的自振特性,对试验测得的脉动压力进行频谱分析得到其优势频率;采用随机振动的方法,将脉动压力转化为节点荷载施加在闸门数值模型上,得到闸门的动力响应。以贵州平寨水利枢纽为例进行计算,研究结果表明,在水体的作用下闸门的自振频率减小,随着开度的增加,闸门的自振频率呈增大的趋势。闸门1阶振型频率在1.1 Hz左右,脉动水流的优势频率最大0.15 Hz,二者相差较大。闸门最大动位移3.61 mm,发生在正常蓄水位543.00 m开度50%工况下,而在20%和50%开度下闸门动应力较大,最大动应力为43.56 MPa,发生在543.00 m开度50%工况。因此,闸门发生共振的可能性不大,闸门在动水作用下较为安全,但需注意闸门在20%和50%开度下的振动情况,避免在此开度下长时间停留。In order to study both the dynamic characteristics and the safety of large-scale radial steel gate under fluctuating pressure,the self-vibration characteristics of the gate is calculated with the additional mass method,and then dominant frequency of the fluctuating pressure measured by the relevant test is obtained through spectrum analysis,while the fluctuating pressure is converted into the nodal load and then applied to the numerical model of the gate by means of the random vibration method,thus the dynamic response of the gate is obtained.The relevant calculation is carried out by taking Pinzhai Water Control Project in Guizhou Province as the study case,from which the study result shows that the self-vibration of the gate is decreased under the effect of water body and exhibits an increasing trend along with the opening.The first-order mode frequency of the gate is about 1.1Hz,while the dominant frequency of pulsating flow is 0.15 Hz,thus a larger difference is there between both of them.The large dynamic displacement of the gate is 3.61 mm and occurs at the normal storage water level of 543.00 m under the operation condition of the opening of 50%,while the dynamic stress of the gate is larger under the operation conditions of the openings of 20%and 50%with the maximum dynamic stress of 43.56 MPa and occurs under the operation condition at the water level of 543.00 m with the gate opening of 50%.Therefore,the possibility of the occurrence of the gate resonance is not so larger,thus the gate is relatively safe under the hydrodynamic effect,but attentions are necessary to be paid to the vibrations under the operations of the gate openings of 20%and 50%,so as to avoid the long-time stoppings of the gate at these openings.

关 键 词：弧形闸门 模型试验 自振特性 随机振动 动力响应 

分 类 号：TV663[水利工程—水利水电工程]