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1.
对于海洋缆索系统,论文针对传统有限段法的不足,提出改进的缆索有限段法,缆索离散为若干弹性缆段组成的多柔体系统,根据缆索的特点选择适当的参考系和广义速率,引入有限元法中的形函数描述段内各点位移,根据Kane方程推导改进缆索有限段模型的运动方程。基于改进的缆索有限段法,提出了模拟拖曳缆索释放一回收过程的变拓扑结构模型,即用可变长度缆段长度的变化和缆段数量的改变建模缆索的释放和回收过程。文中对一海洋拖曳系统进行了动力学仿真,与海洋试验结果比较验证了模型的正确性。  相似文献   

2.
伴随着南海深水油气资源开采的发展,动态缆需求快速增加,其能够集成诸多功能服务于水下生产系统,同时在环境荷载作用下具备良好的顺应性,是海洋油气开采重要的连接设备之一。动态缆的螺旋形式结构复杂,其力学性能分析十分困难。针对海洋动态缆分析软件缺乏的现状,采用MATLAB开发了海洋动态缆截面设计和静态分析数值模拟软件NSCSU 1.0,并通过与专业分析软件OrcaFlex进行结果比较,验证了模拟软件的有效性。考虑到大变形特征,动态缆的静态平衡位形和整体力学响应的计算分析采用能解决几何非线性的细长柔性杆模型;结构刚度分析采用Knapp拉扭理论和Costello弯曲理论。该软件可以对动态缆布局的关键参数进行敏感性分析,计算精度满足工程应用需要;界面简单、操作灵活,可应用于动态缆初步设计阶段,为相关分析软件开发提供一定的借鉴。  相似文献   

3.
海底有缆在线观测系统研究与应用综述   总被引:1,自引:1,他引:0  
获取高质量海洋观测数据是维护国家安全和权益、保障人类生存与可持续发展、应对全球气候变化、开发利用海洋资源、防灾减灾等的重要基础。随着海底观测技术的发展,海底有缆观测已成为地球观测的第三个平台。通过借鉴国内外海底观测网的成熟技术,设计研发单节点海底有缆在线观测系统,主要包含海底观测、电力信息传输和陆上人机交互信息管理等三个子系统,具有高度可扩展性,可根据监测需求集成安装常用的各类海洋观测仪器和水下高清摄像头,从而实现海洋环境和水下生物资源的原位、长期、连续、稳定的在线观测。研发的海底有缆在线观测系统构造简单、扩展性强、经济成本低,已广泛应用于山东省海洋牧场观测网的海洋生态环境和渔业资源、辽东湾的冬季海冰、海洋牧场与海上风电的融合效应、河流入海口水质、海上溢油等不同领域的业务化监测中,为我国海洋生态环境保护与修复、海洋资源开发利用、海洋防灾减灾等提供了高质量的科学数据支撑。海底有缆在线观测系统是业务化海洋在线观测技术领域里的创新研究,具有重要科学意义和广泛应用前景。  相似文献   

4.
徐红丽  燕奎臣 《海洋工程》2004,22(4):126-130
讨论了水下机器人远程通信光纤微缆的动力学问题,研究分析了在海洋层流条件下水下机器人的运动对光纤微缆张力的影响,在仿真分析的基础上提出了对光纤微缆收放系统的设计要求并给出了概念设计方案。  相似文献   

5.
由于高强聚乙烯(HMPE)和聚酯(polyester)缆绳具有各自独特的材料性能,因此提出在超深水绷紧式系泊系统中,采用高强聚乙烯和聚酯组成的混合缆作为系缆。以一系泊在超深水处的FPSO为例,系缆分别采用聚酯缆绳、高强聚乙烯缆绳以及混合缆。比较了循环载荷作用下,不同绷紧式系泊系统的动力响应。分析表明,在超深水中采用混合缆能够设计出合宜刚度的系泊系统,使系泊系统既有保持海洋浮式结构物在平衡位置的能力,又有风暴载荷下良好的生存能力。较理想的混合缆构型是:在靠近海底部分,采用高强聚乙烯缆绳;而在靠近海面部分,采用聚酯缆绳。这些认识对混合缆应用于超深水绷紧式系泊系统具有重要的参考价值。  相似文献   

6.
深海观测系统脐带缆形态分析及计算   总被引:3,自引:0,他引:3  
通过对水下拖曳系统脐带缆索的受力情况、形态进行分析,建立了三维空间缆索的物理模型和数学模型,并在此基础上编制了计算程序,对6000m深海观测系统脐带缆的性状进行了模拟计算,其结果为深拖系统最佳缆长的确定提供了理论依据。  相似文献   

7.
本文介绍科考型有缆遥控潜水器(ROV)国内外现状, 总结概括科考型ROV系统组成。以关键指标选型法为4 500 t级海洋综合科学考察船选定工作水深不小于6 000 m、液压驱动、系统功率不小于150马力、单缆吊放、中部作业甲板安装、侧舷布放回收、集成科考设备系统的第Ⅲ类B级加强型的工作级科考型ROV, 形成适用于4 500 t级海洋综合科学考察船科考型ROV选型方案, 为国内海洋综合科学考察船运行单位选配潜水器提供经验和技术参考。  相似文献   

8.
海洋可控源电磁拖曳系统是海洋可控源电磁勘探系统的重要组成部分,对光电复合缆和绞车的强度有着较高的要求。为了保障作业安全,避免拖缆崩断、绞车损坏等事故的发生,需要对拖曳系统所受的张力进行评估,为实际作业提供参考。本文采用拖曳系统稳态运动求解方法,模拟拖体在海水中的位置,以及放缆时绞车所受的牵引张力,模拟结果与海试实测数据能够较好地吻合。在拖缆长度一定的情况下,随着拖曳速度的增大,绞车牵引张力先减小再增大,光电复合缆长度越长这种现象越明显。  相似文献   

9.
深海浅钻在海洋区域地质调查中的应用   总被引:2,自引:0,他引:2  
深海浅钻是集机、电、液、光等多学科于一体的复杂系统,能够实现定点获取岩石样品,主要应用于深海底矿产资源勘探和深海底地质调查等方面。"海洋六号"船配备的深海浅钻是目前国内先进的光电复合缆供电取样钻机,并首次应用到我国海洋区域地质调查中,成功钻获3个岩石样品和2个沉积物样品,为进一步研究南海矿产资源及深海过程演变等提供了基础资料。  相似文献   

10.
文章介绍了一种用于海洋地震勘探系统的同步采集方法。该方法采用高精度时钟分发、实时FPGA硬件延迟补偿算法结合高效的系统控制协议,对多缆不同通道前端采集系统间的延迟差异进行自动补偿,从而实现了系统级的同步采集。该方法实现简单,并且具有实时性强、可靠性高以及同步性能好等优点。通过海上试验表明,本同步采集方法能够满足4缆6000m范围内、8000通道规模的系统级同步采集。本方法在远距离分布式系统以及传感器网络等应用中也有着重要的参考价值。  相似文献   

11.
For accurate prediction of the deformation of cable in the towed system, a new finite element model is presented that provides a representation of both the bending and torsional effects. In this paper, the cubic spline interpolation function is applied as the trial solution. By using a weighted residual approach, the discretized motion equations for the new finite element model are developed. The model is calculated with the computation program complier by Matlab. Several numerical examples are presented to illustrate the numerical schemes. The results of numerical simulation are stable and valid, and consistent with the mechanical properties of the cable. The model can be applied to kinematics analysis and the design of ocean cable, such as mooring lines, towing, and ROV umbilical cables.  相似文献   

12.
The suction anchor has been widely used in taut or semi-taut mooring systems as an effective and economical solution to anchoring problems. To ensure high reliability, the profile of the mooring cable connecting the fairlead and the pad-eye must be accurately designed. However, previous studies have rarely considered the effect of cable slippage in soil on the mooring behavior, or embedded cables have been studied with an assumed tension at the seabed. This paper, by treating the cable suspended in water and the cable embedded in soil as a single cable, presents a two-dimensional (2D) static model and a three-dimensional (3D) quasi-static model for the cable during pretensioning and in service, respectively. The two models take into account the comprehensive effects of ocean currents, soil resistance and cable elasticity, all of which are critical for the design of a mooring system. Three examples are analyzed using the models and some useful conclusions are drawn.  相似文献   

13.
Nonlinear Finite Element Analysis of Ocean Cables   总被引:2,自引:1,他引:1  
This study has focused on developing numerical procedures for the dynamic nonlinear analysis of cable structures subjected to wave forces and ground motions in the ocean. A geometrically nonlinear finite element procedure using the isoparamnetrie curved cable element based on the Lagrangian folmulation is briefly summarized. A simple and accurate method to determine the initial equilibrium state of cable systems associated with self-weights, buoyancy and the motion of end points is presented using the load incremental method combined with penalty method. Also the Newmark method is used for dynamic nonlinear analysis of ocean cables. Numerical examples are presented to validate the present numerical method.  相似文献   

14.
王蓓  陈永华  于非 《海洋科学》2021,45(7):81-94
论文结合中国科学院海洋研究所2017年至2018年在西太平洋布放的一套6000m深自容式锚泊潜标系统,利用其温、深、盐及海流数据,参考卫星观测的海面资料,依据潜标结构组成,创新性地选用多体动力学软件ADAMS建立柔性缆体有限元模型,进行复原式姿态模拟,对此潜标异常沉降情况进行原因探究,提出减小因潜标大深度沉降导致影响的方法。本文所提出的柔性体模型,可依据海流参数变化改变有限元长度,自定义流阻状态,已被证明在较小海流和海流异常大两种分布模型的拟下,计算机有限元模型分析所得绝对沉降误差达缆绳总长0.18%和0.41%。通过计算机模型依据实际情况的模拟结果,最终印证异常沉降值的形成原因:(1)在系泊结构既定且安全布放的前提下,其沉降异常值的出现只能与其当日所处环境的海流分布状态相关。模型锚泊最大受力8621N,合理选择布放地点、潜标材料可降低系泊损坏风险;(2)若大洋中尺度涡形成和临近导致流速激增,其对整个系统的作用将决定锚系系统布放期间异常沉降深度,由于中尺度涡的形成与迁移具有可预报性,结合系泊深度和位置的及时调整可减小超深度沉降所导致的影响。  相似文献   

15.
This paper analyses nonlinear dynamics of cable towed body system. The cable has been modeled and analyzed using a new nodal position finite element method, which calculates the position of the cable directly instead of the displacement by the existing finite element method. The newly derived nodal position finite element method eliminates the need of decoupling the rigid body motion from the total motion, where numerical errors arise in the existing nonlinear finite element method, and the limitation of small rotation in each time step in the existing nonlinear finite element method. The towed body is modeled as a rigid body with six degrees of freedom while the tow ship motion is treated as a moving boundary to the system. A special procedure has been developed to couple the cable element with the towed body. The current approach can be used as design tool for achieving improved directional stability, maneuverability, safety and control characteristics with the cable towed body. The analysis results show the elegance and robustness of the proposed approach by comparing with the sea trial data.  相似文献   

16.
Dynamic Analysis of Towed and Variable Length Cable Systems   总被引:5,自引:3,他引:2  
Towed cable systems are frequently used in marine measurements where the length of the towed cable varies during launch and recovery. In this paper a novel method for modeling variable length cable systems is introduced based on the finite segment formulation. The variable length of the towed cable is described by changing the length of the segment near the towing point and by increasing or decreasing the number of the discrete segments of the cable. In this way, the elastic effects of the cable can be easily handled since geometry and material properties of each segment are kept constant. Experimental results show that the dynamic behavior of the towed cable is consistent between the model and the physical cable. Results show that the model provides numerical efficiency and simulation accuracy for the variable length towed system.  相似文献   

17.
针对500 m波浪式拖曳系统的技术要求,介绍了拖体、流线型拖缆、电控绞车和总控程序4个关键部分的设计;根据海上的试验情况,分析了拖体的缆深比和定深拖曳等数据,表明本系统达到预期要求,可以为上层海洋学的调查与观测提供良好的平台。  相似文献   

18.
To perform geophysical and multidisciplinary real-time measurements on the ocean floor, it has been attempted to reuse decommissioned submarine cables. The VENUS project reuses the TPC-2, which is one of these systems and runs across the entire Philippine Sea Plate between Guam Island and Okinawa Island. The VENUS system comprises an ocean floor observatory, a submarine cable, and a land system. The major components of the ocean floor observatory are geophysical instruments and a telemetry system. There are seven scientific instrument units including broadband seismometers and a hydrophone array. Digital telemetry using the old analog telephone cable obtains high data accuracy and real-time accessibility to data from a laboratory on land. The bottom-telemetry system and a part of sensor units were installed at a depth of 2157 m on the landward slope of the Ryukyu (Nansei-Syoto) Trench on August 29, 1999. The data from the hydrophone array and tsunami gauge have been correctly transmitted to the data center. The rest of the scientific instruments will be deployed by deep-tow equipment and a remotely operated vehicle. Using a decommissioned submarine cable will greatly reduce construction costs compared to using a new cable system  相似文献   

19.
物探船拖缆姿态及拉力预报   总被引:1,自引:0,他引:1  
针对海洋地震物探船布设探测网络实际工况的要求,提出一种拟合数值计算与模型实验结果预报拖缆姿态及拉力的方法,应用此方法进行多方案比较研究,获得优化的拖缆-扩展器-检测电缆组合探测系统。经海上拖航实验验证,此种预报方法查可行,预报精度完全能满足工程实用要求。  相似文献   

20.
波浪作用下刚性框架浮体及其锚绳运动数值模拟精度分析   总被引:2,自引:1,他引:1  
由小尺度刚性杆件构成的复杂结构近年来多用于海洋平台建设和海洋监测浮标制作以及海洋增养殖人工浮鱼礁的设计。采用有限单元法和集中质量点法建立波浪作用下刚性框架浮体及其锚绳运动数值模型,探讨空间单元划分、时间离散步长、数据保存格式对刚性框架浮体和柔性锚绳运动模拟精度的影响,分别给出此三者之间的匹配关系。研究结果表明:框架浮体的单元划分可依据是否出水给定,单元的划分比建议取0.05;锚绳的单元划分与其上端连接的浮体浮力有关,当锚绳的拉力主要由上端浮体浮力产生时锚绳单元的划分影响较小,当锚绳的拉力主要由波浪力产生时锚绳单元的划分比建议取0.02;空间单元划分与时间离散步长存在匹配关系,通过减小时间步长来追求数值模拟精度时必须同时考虑保存运动物理量截断误差的影响。  相似文献   

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