重力式网箱浮架结构的动力响应特性研究
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摘要
利用离岸网箱进行水产养殖近年来受到了越来越多的重视,离岸区域海况条件恶劣,浮架结构的安全性对于网箱的设计具有极其重要的意义。为研究网箱浮架结构在动态波浪荷载作用下的动力响应,采用有限元法利用PIPE单元建立了浮架的数值模型,并根据物理模型试验结果对该数值模型进行验证,发现有限元模型的计算结果与模型试验结果吻合较好。基于该模型,重点分析了网箱的连接构件数量和个别锚绳发生断裂对浮架动力响应的影响,得到了浮架结构连接处的应力值、变形值以及浮架的变形模式图。结果显示,数值模型能较好地模拟网箱浮架的受力和运动响应;连接构件数量增加时,浮架的应力和变形将会减少;当下游同侧两根锚绳同时断裂时浮架应力和锚绳力最小。研究表明,动力特性是结构优化分析的重要依据,24套连接构件的浮架应优先使用。
Fish culture in the offshore fish cage has been received more and more attention recently,while there are bad sea conditions in offshore areas,so the safety of floating collar is very important for the design of fish cage system. To study dynamic response of floating collar under the wave loading,the numerical model of floating collar was built based on finite element method using the PIPE element,and a series of physical model test were conducted to validate the numerical model,and the results showed that the calculated results agreed well with the test results. Then the numerical simulation was performed to analyze the effects of the number of clamps and the breakage of mooring line on the dynamic response of floating collar. Finally the stress and deformation value of the connection points and deformation models of the floating collar of floating collar were obtained. The results indicated that the numerical model could accurately simulate the deformation of floating collar and the mooring line tension force. In addition,the stress and deformation value of floating collar was decreased with the increase in the number of clamps,and the stress value and mooring line force were decreased significantly to minimum when two mooring lines on the same side break. In conclusion,dynamic response is an important basis for structure optimization and analysis,and floating collar with 24 clamps is recommended.
Fish culture in the offshore fish cage has been received more and more attention recently,while there are bad sea conditions in offshore areas,so the safety of floating collar is very important for the design of fish cage system. To study dynamic response of floating collar under the wave loading,the numerical model of floating collar was built based on finite element method using the PIPE element,and a series of physical model test were conducted to validate the numerical model,and the results showed that the calculated results agreed well with the test results. Then the numerical simulation was performed to analyze the effects of the number of clamps and the breakage of mooring line on the dynamic response of floating collar. Finally the stress and deformation value of the connection points and deformation models of the floating collar of floating collar were obtained. The results indicated that the numerical model could accurately simulate the deformation of floating collar and the mooring line tension force. In addition,the stress and deformation value of floating collar was decreased with the increase in the number of clamps,and the stress value and mooring line force were decreased significantly to minimum when two mooring lines on the same side break. In conclusion,dynamic response is an important basis for structure optimization and analysis,and floating collar with 24 clamps is recommended.
引文
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[12]YONG CUI,CHANG TAO GUAN,RONG WAN,et al.Numerical simulation of a flatfish cage system in waves and currents[J].Aquacultural Engineering,2013,56(1):26-33.
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[14]桂福坤.深水重力式网箱水动力学特性研究[D].大连:大连理工大学,2006.
[2]LI Y C,GUI F K,TENG B.Hydrodynamic behavior of a straight floating pipe under wave conditions[J].Ocean Engineering,2006,34(3):552-559.
[3]郑艳娜,董国海,桂福坤,等.圆形重力式网箱浮架结构在波浪作用下的运动响应[J].工程力学,2006,23(1):222-228.
[4]FREDRIKSSON D W,TSUKROV I.Development of structural modeling techniques for evaluating HDPE plastic net pens used in marine aquaculture[J].Ocean Engineering,2007,34(16):2124-2137.
[5]郭根喜.圆形网箱浮架结构有限元分析[J].广东海洋大学学报,2011,31(4):69-74.
[6]郝双户.深水重力式网箱浮架结构的流固耦合研究[D].大连:大连理工大学,2008.
[7]BREBBIA C A,WALKER S.Dynamic analysis of offshore structure[M].London:Newnes-Butterworths,1979:109-143.
[8]黄小华,郭根喜,胡昱,等.圆形网箱浮架系统的受力特性研究[J].南方水产,2009,5(4):36-40.
[9]赵云鹏,李玉成,董国海.深水抗风浪网箱水动力学特性研究[J].渔业现代化,2011,38(2):10-16.
[10]黄小华,郭根喜,胡昱,等.波浪作用下圆形网箱浮架系统的运动特性研究[J].水产学报,2009,33(5):878-884.
[11]许条建.深水组合式网箱水动力特性研究[D].大连:大连理工大学,2014.
[12]YONG CUI,CHANG TAO GUAN,RONG WAN,et al.Numerical simulation of a flatfish cage system in waves and currents[J].Aquacultural Engineering,2013,56(1):26-33.
[13]杨树耕,孟昭英,任贵永.有限元分析软件ANSYS在海洋工程中的应用[J].中国海洋平台,2000,15(2):41-44.
[14]桂福坤.深水重力式网箱水动力学特性研究[D].大连:大连理工大学,2006.