深水自升式平台动力响应分析研究  

Analysis of Dynamic Response of Deepwater Jackup Platform

作　　者：蒙占彬 张士华 田海庆 Meng Zhanbin;Zhang Shihua;Tian Haiqing(School of Mechanical,Ship&Offshore Engineering,Qimhou University;Drilling Technology Research Institute,Shengli Petroleum Engineering Co.,Ltd.,SINOPEC)

机构地区：[1]钦州学院机械与船舶海洋工程学院 [2]中石化胜利石油工程有限公司钻井工艺研究院

出　　处：《石油机械》2018年第4期35-41,共7页China Petroleum Machinery

摘　　要：深水自升式平台在波浪和海流等动态环境载荷作用下易发生振动响应。鉴于此,对自升式平台动力响应分析方法进行探讨,得到如下结论:弹性地基刚度系数EFS对平台桩腿动态应力影响不敏感,但对动态位移影响较大;平台桩腿动态应力和位移随波高的增加而增大,随周期增大而减小;节距L_h对平台应力和位移影响较小;弦杆间距L_R的增加可减小结构的动态应力和位移;波浪周期与平台自振周期相差越小,动力放大系数(DAF)计算结果与位移比法和应力比法相比差异越大,计算越保守,而低频波作用下,三者计算结果基本一致;单自由度方法无法反映环境载荷方向的影响,不同环境载荷方向下,由位移比法与应力比法计算得的DAF有一定差异,特别是平台刚度不均衡时,不可忽略环境载荷方向的影响;节距对平台DAF影响相对较小,而弦杆间距对平台DAF影响较大。所得结论可为深水自升式平台的设计与动力响应控制提供指导。The deep-water jackup platform is prone to vibration response under dynamic environmental loads such as waves and currents.In view of this,the dynamic response analysis method for jack-up platform is discussed.The following conclusions are drawn:The elastic foundation stiffness coefficient E F S has little effect on the dynamic stress of the platform leg,but has a great influence on the dynamic displacement.The dynamic stress and displacement of the platform leg increase with the increase of the wave height,but decrease with the increase of the cycle.The pitch L h has little influence on the platform stress and displacement.The increase of the chord member spacing LR can reduce the dynamic stress and displacement of the structure.Smaller difference between the wave period and the natural vibration period of the platform would result in greater difference between the D A F calculation result and the results by displacement ratio method and stress ratio method,and also lead to more conservative results.Under the low-frequency wave,the results of the three calculation methods are basically the same with litde difference.The single degree of freedom method cannot reflect the influence of the environmental load direction.There is a difference between the D A F s calculated by the displacement ratio method and the stress ratio method given different environmental load directions.In particularly,when the platform stiffness is not balanced,the impact of the direction of the environmental load cannot be ignored.The pitch has a relatively small influence on the platform D A F 9 but the chord member spacing has a greater impact.The study conclusions can provide guidance for the design and control of dynamic response of deep-water jackup platforms.

关 键 词：自升式平台 动力响应 位移比法 应力比法 动力放大系数 

分 类 号：TE952[石油与天然气工程—石油机械设备]