摘要
为探究机组泵站开机产生的流激振动对双线供水管道稳定性的影响,以刘家沟水库工业水厂#1、#2水泵机组埋土管道区间段为例,建立“双线管道—人工填土—地基”为一体的三维有限元模型,根据左线管道的实测数据进行流激振动等效荷载反演,探究送水泵站开机产生的流激振动对双线供水管道力学特性及振动特性的影响。结果表明,机组泵站开机状态下两者的Mises应力相差较大、z向位移响应更为接近,相较于左线管道,右线管道所承担的流激振动等效荷载减小了30.6%、z向位移折减16.0%;流激振动作用下左线、右线管道的主频基本相同,分别为24.8、49.6、74.4Hz;随着Z3节点与右线管道距离逐渐增加,右线管道节点的最大功率谱密度值逐渐减小,振动衰减逐渐增加;随着左线管线距离的增加,振动能量呈先减小后增加的趋势。研究成果可为类似供水管道工程提供理论参考和依据。
To investigate the effect of flow induced vibration generated by the start-up of the pumping station on the stability of the double line water supply pipeline,the section of the buried soil pipeline of#1,#2 water pump units in the Liujiagou Reservoir Industrial Water Plant was selected as the research object.A three-dimensional finite element model integrating"double line pipeline-artificial filling-foundation"was established.Based on the measured data of the left line pipeline,the equivalent load of flow induced vibration was inverted to explore the influence of flow induced vibration gen-erated by the start-up of the water supply pump station on the mechanical and vibration characteristics of the double line water supply pipeline.The results show that the Mises stress difference between the two pump stations in the start-up state is significant,and the z-direction displacement response is closer.Compared to the left pipeline,the equivalent load of flow induced vibration borne by the right pipeline is reduced by 30.6%,and the z-direction displacement is reduced by 16.0%.Under the action of flow induced vibration,the main frequencies of the left and right pipelines are basically the same,at 24.8 Hz,49.6 Hz,and 74.4 Hz,respectively.As the distance between Z3 node and the right pipeline gradually increases,the maximum power spectral density value of the right pipeline node gradually decreases,and the vibration at-tenuation gradually increases.As the distance between the left pipeline increases,the vibration energy shows a trend of first decreasing and then increasing.The research results can provide theoretical reference and basis for similar water sup-ply pipeline projects.
作者
陈连映
聂俊坤
夏进喜
马文涛
徐存东
韩文浩
CHEN Lian-ying;NIE Jun-kun;XIA Jin-xi;MA Wen-tao;XU Cun-dong;HAN Wen-hao(Ningxia Taiyangshan Water Service Co.,Ltd.,Yinchuan 750000,China;College of Water Resources,North China University of Water Resources and Electric Power,Zhengzhou 450046,China;Key Laboratory for Technology in Rural Water Management of Zhejiang Province,Hangzhou 310018,China)
出处
《水电能源科学》
北大核心
2024年第11期131-136,共6页
Water Resources and Power
基金
国家自然科学基金项目(51579102)
宁夏回族自治区水利科技项目(TYSSW-2023-65,TYSSW-2024-55)。
关键词
供水管道
流激振动
数值模拟
荷载反演
力学及振动特性
water supply pipeline
flow induced vibration
numerical simulation
load inversion
mechanical and vi-bration characteristics
