正弦激励下零浮力海洋拖缆动力特性与实验研究
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摘要
海洋地震拖缆是海洋油气资源勘探中的关键设备,为研究海洋地震拖缆的动力特性及其在不同频率正弦激励干扰下的动力响应,建立了零浮力拖缆的数学模型,设计了一套完整的实验方案,通过弹性测力机构放大张力信号以排除环境干扰,测量了不同拖曳速度与激振频率条件下拖缆首部的张力变化及缆上位移响应情况,初步分析了正弦激励作用下零浮力拖缆的动力学响应。弹性测力机构具有良好的线性度与可重复性,拖缆受到的水阻力与拖曳速度的平方成正比,数值计算与实验结果对比验证了数学模型的正确性,初步分析了正弦激励作用下零浮力拖缆的动力学响应。
Marine seismic streamer is a key equipment in offshore oil and gas exploration. To study the dynamic characteristics of a zero buoyancy marine streamer with guide rope and towed tail under different-frequency sinusoidal excitation,a new math model for a zero buoyancy streamer is established and an experiment is designed. In the experiment,front-end tension and displacement on streamer with different towed speed and different excitation frequencies its are measured. An elastic mechanism is designed to enlarge the tension signal. The elastic mechanism has good linearity,and the water resistance is proportional to the square of the towing speed. The comparison of front-end tension from numerical calculation and experiment confirms the correctness of the model. Preliminary analysis of dynamic characteristics under sinusoidal excitation is investigated at last.
Marine seismic streamer is a key equipment in offshore oil and gas exploration. To study the dynamic characteristics of a zero buoyancy marine streamer with guide rope and towed tail under different-frequency sinusoidal excitation,a new math model for a zero buoyancy streamer is established and an experiment is designed. In the experiment,front-end tension and displacement on streamer with different towed speed and different excitation frequencies its are measured. An elastic mechanism is designed to enlarge the tension signal. The elastic mechanism has good linearity,and the water resistance is proportional to the square of the towing speed. The comparison of front-end tension from numerical calculation and experiment confirms the correctness of the model. Preliminary analysis of dynamic characteristics under sinusoidal excitation is investigated at last.
引文
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[2]DOWLING A P.The dynamics of towed flexible cylinders.Part 1.Neutrally buoyant elements[J].Journal of Fluid Mechanics,1988(187):507-532.
[3]王飞.海洋勘探拖曳系统运动仿真与控制技术研究[D].上海:上海交通大学,2007.(WANG Fei.Motion simulation and control strategy research of ocean exploration towing system[D].Shanghai:Shanghai Jiao Tong University,2007.(in Chinese))
[4]HOWELL C T.Investigation of the dynamics of low-tension cables[D].Cambridge:Department of Ocean Engineering,Massachusetts Institute of Technology,1993.
[5]PARK H I,JUNG D H.Nonlinear dynamic analysis on low tension towed cable by finite difference method[J].J.Soc.Naval Architects Korea,2002,39(1):28-37.
[6]EGIL P.A nautical study of towed marine seismic streamer cable configuration[D].Trondheim:Norwegian University of Science and Technology,1996.
[7]ERSDAL S.An experimental study of hydrodynamic forces on cylinders and cables in near axial flow[D].Trondheim:Department of Marine Technology Faculty of Engineering Science and Technology,Norwegian University of Science and Technology,2004.
[8]LIU T,ZHANG W J,MA J.Transient dynamic analysis of towed low-tension cable with experimental verification[J].Journal of Ship Mechanics,2013,17(3):197-213.
[9]张广磊.基于广义α算法低应力拖缆动力学仿真及实验研究[D].上海:上海交通大学,2012.(ZHANG G L.Dynamic simulation and experimental research of towed low-tension cable based on generalizedαmethod[D].Shanghai:Shanghai Jiao Tong University,2012.(in Chinese))
[10]刘涛.海洋地震拖缆姿态控制策略研究[D].上海:上海交通大学,2013.(LIU T.Research of attitude control strategy of marine seismic streamer[D].Shanghai:Shanghai Jiao Tong University,2013.(in Chinese))
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