淮安第三抽水泵站贯流泵房动力特性的数值和测试研究
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摘要
为研究贯流式块基型泵房的自振特性,结合淮安第三抽水泵站工程,采用有限元数值分析和脉动测试方法,确定贯流式块基型泵房的主要振型和频率.对比有限元数值计算和脉动测试结果,认为上下部结构刚度相差悬殊的贯流式块基型泵房,其基频主要受上部厂房结构的影响,而正确模拟厂房地坪处楼板的作用是确定泵房下部结构自振频率的关键.在研究贯流式块基型泵房的自振特性时,应选择结构刚度变化较大层布置测点.
A case study was performed on the third Huaian pumping station to study the vibration characteristics of tubular block-foundation pump house.The main vibration modes and frequencies were determined by the finite element method and pulsating method.Comparison of the results of the two methods shows that the upper powerhouse structure has an important influence on the fundamental frequency of turbular block-foundation pump house whose lower structure has higher stiffness than the upper structure,and that the key to determine the natural frequency of lower pump house structure is to correctly simulate the effect of the slab on the powerhouse floor.It is also indicated that the measuring points should be arranged at the layers with great stiffness variation.
A case study was performed on the third Huaian pumping station to study the vibration characteristics of tubular block-foundation pump house.The main vibration modes and frequencies were determined by the finite element method and pulsating method.Comparison of the results of the two methods shows that the upper powerhouse structure has an important influence on the fundamental frequency of turbular block-foundation pump house whose lower structure has higher stiffness than the upper structure,and that the key to determine the natural frequency of lower pump house structure is to correctly simulate the effect of the slab on the powerhouse floor.It is also indicated that the measuring points should be arranged at the layers with great stiffness variation.
引文
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[2]文世鹏.应用数值分析[M].北京:石油工业出版社,2001.
[3]郑源,江泉,陈学富,等.大型贯流泵机组稳定性测试与诊断研究[R].南京:河海大学水利水电工程学院,2005.
[4]孙永明,李同春,牛志伟.苏州大龙港泵站三维有限元结构应力分析[J].水利水电科技进展,2007,27(增刊2):97-99.
[5]张仁东.具有块基型泵房的大型泵站动力特性分析研究[D].南京:河海大学,2006.
[6]欧阳金惠.三峡电站厂房结构振动研究[D].北京:中国水利水电科学研究院,2005.
[7]蔡新,武颖利,郭兴文.混凝土坝及坝后式厂房整体地震响应分析[J].河海大学学报:自然科学版,2008,36(1):49-53.
[8]邢永欣.灯泡贯流式水电站厂房结构计算分析[D].西安:西安理工大学,2006.
[9]冯波.大型坝后式电站厂房动力特性及动力监测研究[D].南京:河海大学,2006.
[10]张文翠,别社安,才君眉.水工结构自振频率和动应力测试分析系统[J].水利水电技术,1999,30(3):26-28.
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