摘要
【目的】为探究环北部湾水资源配置工程地心取水泵站厂房水泵机组压力脉动对厂房结构产生的影响,开展地心泵站水泵压力脉动激励下厂房振动特性研究。【方法】根据模型试验所得的压力脉动频率对泵站厂房模型3#、4#机组段全流道施加对应的压力脉动荷载,利用谐响应分析方法将压力脉动荷载视作简谐荷载,计算在不同压力脉动频率下厂房结构的振动响应,并结合厂房结构振动的控制标准,对结构的安全性进行分析与评价。【结果】厂房在正常扬程下的振动响应值远小于在异常低扬程下的,厂房对低频激励荷载的振动响应幅值较高频激励荷载的大,低频激励下厂房以竖直方向振动响应为主,而高频激励下则存在较强的水平振动响应;振动响应较大的位置主要位于发电机层楼板处、吊物孔附近以及机墩的上基础部分。【结论】在异常低扬程工况下会出现振动加速度超出人体健康标准的情况,运行中应采取避振措施;在激励频率为9倍和18倍叶轮叶片转动频率时,各层楼板处的振动相对明显,风罩层楼板的振动响应值达到最大。
【Objective】In order to investigate the effect of pressure pulsation of pumping units on the structure of the Dixin pumping station powerhouse of the Beibu Gulf Water Resources Allocation Project,this study analyzes and evaluates the vibration characteristics of the powerhouse induced by pressure pulsation of the pumping units in Dixin pumping station.【Method】Pressure pulsation loads obtained from the model test were applied to the full flow passages of the 3#and 4#unit sections of the pumping station powerhouse.The loads were treated as a harmonic load,and the structural vibration response of the powerhouse was calculated under different pressure pulsation frequencies using the harmonic response analysis method.The structural safety was analyzed and evaluated according to the control standards of powerhouse structural vibration.【Results】The results showed that the vibration response of the powerhouse under normal head was much smaller than that under abnormally low head.The vibration response amplitude under low-frequency excitation was larger than that under highfrequency excitation.Under low-frequency excitation,the vibration response was mainly in the vertical direction,while under high-frequency excitation,significant horizontal vibration occurred.The largest vibration response was observed at the generator-level floor,near the hole of the crane and at the upper foundation of the machine pier.【Conclusion】Under abnormal low head condition,vibration acceleration exceeds human health standards,and vibration mitigation measures should be implemented during operation.The vibrations of each floor plate are relatively pronounced when the excitation frequency is 9 times and 18 times the rotational frequency.The maximum vibration response of the floor plate is observed at the windshield level.
作者
刘帅
邓舒文
高琳
王玉川
樊红刚
LIU Shuai;DENG Shuwen;GAO Lin;WANG Yuchuan;FAN Honggang(Guangdong Yuehai Yuexi Water Supply Co.,Ltd.,Zhanjiang 524033,China;College of Water Resources and Architectural Engineering,Northwest A&F University,Yangling 712100,China;China Water Resources Pearl River Planning,Surveying&Designing Co.,Ltd.,Guangzhou 510610,China;Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China)
出处
《华北水利水电大学学报(自然科学版)》
北大核心
2025年第5期53-59,共7页
Journal of North China University of Water Resources and Electric Power:Natural Science Edition
基金
国家自然科学基金项目(51879140)
广东粤海粤西供水有限公司科技项目(CD88-ZJ10-2022-0045)。
关键词
泵站厂房
压力脉动
谐响应分析
振动特性
安全评价
pumping station powerhouse
pressure pulsation
harmonic response analysis
vibration characteristics
safety evaluation
