On the basis of Hamilton principle. the equation of sonlid-liquid coupling vibration of pipe conveying fluid is deduced. An asymmetrical sonlid-liquid coupling damp matrix and a symmetrical solid-liquid coupling Sti...On the basis of Hamilton principle. the equation of sonlid-liquid coupling vibration of pipe conveying fluid is deduced. An asymmetrical sonlid-liquid coupling damp matrix and a symmetrical solid-liquid coupling Stiffness matrix are obtained. Using QR method , pipe’s nature frequencies are calculated. The curves of the first four orders of natural frequency-flow velocity of pipe waw given .The influence of flowing velocity ,pressure, solid-liquid coupling damp and solid-liquid coupling stiffness on natural frequency are discussed respectively.The dynamic respondence of the pipes for stepload with different flow velocity are calculated by Newmark method .It is found that,with the flow velocity increased, the nature frequency of the pipes reduced, increased,reduced again and so on.展开更多
文摘On the basis of Hamilton principle. the equation of sonlid-liquid coupling vibration of pipe conveying fluid is deduced. An asymmetrical sonlid-liquid coupling damp matrix and a symmetrical solid-liquid coupling Stiffness matrix are obtained. Using QR method , pipe’s nature frequencies are calculated. The curves of the first four orders of natural frequency-flow velocity of pipe waw given .The influence of flowing velocity ,pressure, solid-liquid coupling damp and solid-liquid coupling stiffness on natural frequency are discussed respectively.The dynamic respondence of the pipes for stepload with different flow velocity are calculated by Newmark method .It is found that,with the flow velocity increased, the nature frequency of the pipes reduced, increased,reduced again and so on.
文摘番禺35-1/2水下生产设施项目是中国首次全面采用水下生产系统的项目,在水下生产设施管线终端和在线管汇建造完成之后,要进行流体管线的水压试验及水下阀门单侧压差试验,试验时需将水下生产设施流体管端部封堵。由于试验压力比较高(46.5 MPa),且管线为全焊接无法兰连接,故需设计专用非标高压试压管帽。而流体管线设计标准采用的是ASME 31.8—2010《Gas Transmission and Distribution Piping System》,非标设计采用标准一般为ASMEⅧ第二册—2011《压力容器建造另一规则》或JB 4732—1995《钢制压力容器——分析设计标准》,因此需要对试压管帽的设计和分析方法进行研究,保证设计的合理性。基于JB 4732—1995,对端部外径为273mm的试压管帽进行了设计、有限元分析和计算验证,得到了合理的计算和有限元分析方法,设计制造的试压管帽成功应用于项目测试中。