海上浮式结构物的模糊运动响应分析初探
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摘要
为进一步客观反映海上浮式结构在波浪中的运动响应,对其进行不确定性分析特别是模糊运动响应分析是十分必要的。运用模糊统计方法,并结合试验分析了波浪载荷及系泊约束的模糊性,对系泊结构的系统模糊性进行了初步描述,推导了相应的模糊运动方程。研究表明,模糊性因素的存在,按传统的确定性算法难以准确反映结构的真实受力及运动情况,先将波浪载荷等输入模糊化后再求解方程并结合试验数据综合确定系统的受力和运动,这是目前较有效的改进方法。
In order to make further clear the response of the floating structure to the movement of the wave,it is absolutely necessary to make an analysis of the uncertainty,especially of the fuzzy movement response.The fuzziness of the wave load and the mooring restriction are analyzed with the aid of the fuzzy statistical method and experiments in the paper,with the primary description of the systematic fuzziness made of the moored structure and the corresponding fuzzy motion equation deduced.The research shows that with the fuzzy factors existing,it is difficult to reflect the real forces and movement of the structure by means of the traditional method.Therefore,with wave loads fuzzy-treated before the solution of the equation,to determine the real movement of the system under forces with the help of the experimental data is found a comparatively effective method at present.
In order to make further clear the response of the floating structure to the movement of the wave,it is absolutely necessary to make an analysis of the uncertainty,especially of the fuzzy movement response.The fuzziness of the wave load and the mooring restriction are analyzed with the aid of the fuzzy statistical method and experiments in the paper,with the primary description of the systematic fuzziness made of the moored structure and the corresponding fuzzy motion equation deduced.The research shows that with the fuzzy factors existing,it is difficult to reflect the real forces and movement of the structure by means of the traditional method.Therefore,with wave loads fuzzy-treated before the solution of the equation,to determine the real movement of the system under forces with the help of the experimental data is found a comparatively effective method at present.
引文
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[2]Zadeh L A.模糊集合、语言变量及模糊逻辑[M].北京:科学出版社,1982
[3]王光远,张跃.模糊随机过程论[M].贵州:贵州科技出版社,1994
[4]张艳红,章在墉.考虑参数不确定性结构动力分析的一种新方法[J].同济大学学报,1997,25(3):262-267
[5]陈建军,车建文.基于概率的工程结构动力特性优化设计[J].应用力学学报,2000,17(1):29-35
[6]Shinozuka M,Astill C J.Randomeigenvalue probleminstructural analysis[J].AIAA,1972,10(4):456-562
[7]Vaicailis R.Free vibrations of beams with randomchar-acteristics[J].Sound&Vibration,1974,5(1):13-21
[8]吴祥法,扬国树.随机参数结构动力特性的统计分析[J].北京理工大学学报,1996,16(1):43-47
[9]方华灿,高国华.海洋环境载荷的不确定性分析[J].石油机械,1994,22(9):25-30
[10]严建国,孙芦忠,陈徐均.系泊浮体系统非线性运动的模糊随机性因素探讨[J].解放军理工大学学报(自然科学版),2002,(1):63-65
[11]张爱林,王惠德.离岸结构的动力分析与模糊地震响应[J].石油学报,1994,(4):118-123
[12]曹炳元.应用模糊数学与系统[M].北京:科学技术出版社,2005:192-194
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