基于现场监测的海洋平台冰振控制效果评价
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摘要
渤海辽东湾的JZ20-2NW平台采用甲板阻尼隔振技术降低平台的冰激振动问题。根据海洋平台冰激振动的特点,设计现场监测系统,检验阻尼隔振系统的减振效果。对平台隔振的上下两层甲板的加速度和相对位移响应进行监测,并对实测数据进行对比分析。监测结果表明,上层甲板的振动强度相比下层甲板有所减弱,阻尼隔振装置起到控制上层甲板振动的效果。但是上下甲板的振动频率和相位无差别,说明减振装置未产生最理想的减振效果。同时对有无阻尼隔振装置结构的阻尼比进行提取,表明相对位移越大,上下甲板的阻尼比越大。减振后上下甲板的阻尼比都有所增加,结构振动耗能增加。应用实践表明,阻尼隔振技术是一种有效的海洋平台冰激振动减振措施,但仍有许多地方需要完善。
For JZ20-2NW platform,the damping isolation technology was used to reduce ice-induced vibration problems.In order to test its vibration-suppressing effect,accelerations and relative displacements of the two decks were measured and analyzed.The results showed that the vibration intensity of the upper deck was weaker than that of the lower deck;the damping isolation device is effective to reduce the vibration of the upper deck.The structural damping ratios with and without the damping isolation device were calculated.It indicated that the structural damping ratio increases and the energy consumption grows after installing the damping isolation device.The attempt to a real platform showed that the damping isolation system is an effective method for ice-induced vibration control of an offshore platform,but there are a lot of places can be improved.
For JZ20-2NW platform,the damping isolation technology was used to reduce ice-induced vibration problems.In order to test its vibration-suppressing effect,accelerations and relative displacements of the two decks were measured and analyzed.The results showed that the vibration intensity of the upper deck was weaker than that of the lower deck;the damping isolation device is effective to reduce the vibration of the upper deck.The structural damping ratios with and without the damping isolation device were calculated.It indicated that the structural damping ratio increases and the energy consumption grows after installing the damping isolation device.The attempt to a real platform showed that the damping isolation system is an effective method for ice-induced vibration control of an offshore platform,but there are a lot of places can be improved.
引文
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[14]张力,岳前进,张文首,等.一种调谐质量阻尼器(TMD)等效阻尼力测量方法[J].大连理工大学学报,2010,50(2):162-166.
[15]欧进萍,龙旭,肖仪清,等.导管架式海洋平台结构阻尼隔振体系及其减振效果分析[J].地震工程与工程振动,2002,22(3):116-122.
[16]杨彪,欧进萍.导管架式海洋平台磁流变阻尼隔震结构的模型试验[J].振动与冲击,2006,25(5):1-6.
[17]张纪刚,吴斌,欧进萍.海洋平台冰振控制试验研究[J].东南大学学报,2005,35(增刊):31-34.
[18]Wu B,Shi P F,Wang Q Y,et al.Performance of an offshoreplatform with MR dampers subjected to ice and earthquake[J].Structural Control and Health Monitoring,2010,18(16):682-697.
[19]陆文发,李林普,高明道.近海导管架平台[M].北京:海洋出版社,1992.
[20]龙驭球,包世华.结构力学教程[M].北京:高等教育出版社,1998.
[2]岳前进,刘圆,屈衍,等.抗冰平台的冰振疲劳分析[J].工程力学,2007,24(6):159-164.
[3]张大勇,岳前进,李刚,等.冰振下海洋平台上部天然气管线振动分析[J].天然气工业,2006,26(12):139-141.
[4]岳前进,李辉辉,于学兵.渤海石油平台的冰振及对作业人员的影响[J].中国海洋平台,2005,20(3):35-39.
[5]Vandiver J K,Mitome S H.Effect of liquid storage tanks onthe dynamic response of offshore platforms[J].AppliedOcean Research,1979,1(1):67-74.
[6]Lee H H.Stochastic analysis for offshore structures withadded mechanical dampers[J].Ocean Engineering,1997,24(9):817-834.
[7]周亚军,赵德有.海洋平台结构控制综述[J].振动与冲击,2004,23(4):40-44.
[8]桂洪斌,金咸定,肖熙.海洋平台振动控制研究综述[J].中国海洋平台,2003,18(5):19-25.
[9]徐俊,史庆增,宋安.海洋导管架平台抗冰振措施探讨[J].中国造船,2003,44(增刊):367-372.
[10]王翎羽,宋安,陈星.调谐液体阻尼器在冰区导管架平台上应用的初步研究[J].振动工程学报,1994,7(2):144-149.
[11]欧进萍,肖仪清,段忠东,等.设置粘弹性耗能器的JZ20-2MUQ平台结构冰振控制[J].海洋工程,2000,18(3):9-14.
[12]Yue Q J,Zhang L,Zhang W S,et al.Mitigating ice-inducedjacket platform vibrations utilizing a TMD system[J].ColdRegions Science and Technology,2009,56:84-89.
[13]张文首,张力,岳前进.基于加速度反馈的大型复杂结构H∞控制[J].工程力学,2009,26(5):216-220.
[14]张力,岳前进,张文首,等.一种调谐质量阻尼器(TMD)等效阻尼力测量方法[J].大连理工大学学报,2010,50(2):162-166.
[15]欧进萍,龙旭,肖仪清,等.导管架式海洋平台结构阻尼隔振体系及其减振效果分析[J].地震工程与工程振动,2002,22(3):116-122.
[16]杨彪,欧进萍.导管架式海洋平台磁流变阻尼隔震结构的模型试验[J].振动与冲击,2006,25(5):1-6.
[17]张纪刚,吴斌,欧进萍.海洋平台冰振控制试验研究[J].东南大学学报,2005,35(增刊):31-34.
[18]Wu B,Shi P F,Wang Q Y,et al.Performance of an offshoreplatform with MR dampers subjected to ice and earthquake[J].Structural Control and Health Monitoring,2010,18(16):682-697.
[19]陆文发,李林普,高明道.近海导管架平台[M].北京:海洋出版社,1992.
[20]龙驭球,包世华.结构力学教程[M].北京:高等教育出版社,1998.
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