振动与冲击
振動與遲擊
진동여충격
JOURNAL OF VIBRATION AND SHOCK
2014年
21期
137-141
,共5页
申永康%方寒梅%赵春龙%刘铨鸿%王正中
申永康%方寒梅%趙春龍%劉銓鴻%王正中
신영강%방한매%조춘룡%류전홍%왕정중
水工结构%拦污栅%流激振动%液固耦合
水工結構%攔汙柵%流激振動%液固耦閤
수공결구%란오책%류격진동%액고우합
hydraulic structure%trash rack%flow-induced vibration%fluid-structure interaction
以巴基斯坦真纳电站进水口拦污栅结构为对象,研究大型拦污栅结构流激振动及其影响因素。建立了拦污栅结构数值分析模型,以液固单元接触分析处理了液固耦合作用,分析了栅条作用、液固耦合、支撑约束及结构边界条件等因素对大型拦污栅结构动力特性的影响,给出了大型拦污栅避免栅体涡栅共振及栅条流激共振评判条件。结果表明:栅条作用与液固耦合对大型拦污栅结构动力特性的影响不容忽视,结构加固可能降低其动力安全性,而支撑约束及结构边界条件对拦污栅结构振动影响很小。该成果为该型拦污栅流激共振评判提供新依据,为相关技术标准修订提供参考。
以巴基斯坦真納電站進水口攔汙柵結構為對象,研究大型攔汙柵結構流激振動及其影響因素。建立瞭攔汙柵結構數值分析模型,以液固單元接觸分析處理瞭液固耦閤作用,分析瞭柵條作用、液固耦閤、支撐約束及結構邊界條件等因素對大型攔汙柵結構動力特性的影響,給齣瞭大型攔汙柵避免柵體渦柵共振及柵條流激共振評判條件。結果錶明:柵條作用與液固耦閤對大型攔汙柵結構動力特性的影響不容忽視,結構加固可能降低其動力安全性,而支撐約束及結構邊界條件對攔汙柵結構振動影響很小。該成果為該型攔汙柵流激共振評判提供新依據,為相關技術標準脩訂提供參攷。
이파기사탄진납전참진수구란오책결구위대상,연구대형란오책결구류격진동급기영향인소。건립료란오책결구수치분석모형,이액고단원접촉분석처리료액고우합작용,분석료책조작용、액고우합、지탱약속급결구변계조건등인소대대형란오책결구동력특성적영향,급출료대형란오책피면책체와책공진급책조류격공진평판조건。결과표명:책조작용여액고우합대대형란오책결구동력특성적영향불용홀시,결구가고가능강저기동력안전성,이지탱약속급결구변계조건대란오책결구진동영향흔소。해성과위해형란오책류격공진평판제공신의거,위상관기술표준수정제공삼고。
Flow-induced vibration and its influence factors were investigated for hydraulic trash-racks of the intake of Pakistan Jinnah Hydropower Station.The numerical analysis model was established,the fluid-structure interaction effect was investigated using element touchs between fluid and structure.The influence factors on dynamic characteristics of large trash-racks were analyzed including racks,fluid-structure interaction,brace constraint and boundary condition.The judgment conditions for vortex-resonance occurrence of large trash-racks were obtained.The results showed that the action of gird bars and the fluid-structure interaction have strong influences on the dynamic characteristics of a large trash-rack;reinforcing the structure may reduce its dynamic safety;while brace constraint and boundary condition have small effects on the trash-rack vibration.The study provided a new basis for evaluating the flow-induced vibration for this type trash-rack and a reference for revising the related technical standards.