海上平台管节点疲劳性能研究

在研究D500系列管节点疲劳特性的基础上，吸取国内外研究成果，建立了适用较广的可靠的管节点疲劳寿命计算方法．文章给出了建立在大量数据基础上的S－N曲线，探讨了影响疲劳寿命的因素，进行了局部应力—应变法及断裂力学法计算分析，对海洋平台管节点提出了适用于工程实际的建议．     

一种新型的舰船抵滩航渡管理系统

介绍了一种舰船抵滩航渡管理系统的组成和功能。对舰船航渡、抵滩过程的航泊安全、航线优化及管理进行了研究,给出了该系统几个关键技术的解决思路和方法,可为舰船抵滩航渡方案的制定和实施、舰船抵滩航渡的安全组织和管理提供技术支持。     

UPS系统设计与实现

论述UPS在供电系统中的重要作用,举例介绍UPS系统的设计方案.简述UPS冗余并联系统的工作原理及后备电池组和UPS容量的选择.     

三用工作船挡货栏杆结构设计与分析

诸多功能集于一身的三用工作船(Anchor Handing Tug Supply Vessel, 以下简称AHTS)在有限的甲板空间内既要保证载货面积,又要预留足够的人员通行和设备空间。挡货栏杆作为甲板上主要的结构件,其设计一直是个难点。本文以某AHTS为例,就挡货栏杆的立柱、顶梁、拦挡构件和设备基座等主要组成部分及其结构特性进行概述,并给出立柱受货物侧向压力和受绑扎件集中力的强度校核方案,为挡货栏杆的设计提供参考和借鉴。     

Active or passive? Sustainable manufacturing in the direct-channel green supply chain: A perspective of two types of green product designs

This paper considers a supply chain in which a manufacturer produces and sells two types of green products in its direct channel under government interventions aiming to improve social welfare. There is a Stackelberg game between the two stakeholders. Our research derives the closed form solutions to the optimal tax, green degree and price for the products, and obtains the strategies for government and manufacturer under different environmental policies. By considering six scenarios, our models obtain the best choice from the comparison between the two cases in which the manufacturer determines its product green degree actively or accepts the green standard set by the government passively. Then, we conduct some sensitivity analyses and explore the scenario in which there is competition between green products and non-green products. The results of this research indicate that the government setting the product green standard and providing the manufacturer with a subsidy is significant.     

Simulation of torpedo anchor set-up

Torpedo anchors are used for station keeping of floating offshore platforms and fixing risers to the seabed in deep water. Their main benefit over other anchors is reduction in anchor installation cost via free falling in the water. A torpedo anchor has a steel cylindrical shaft with a conical tip and is ballasted in order to deepen the soil penetration and increase the anchor holding capacity. In order to address the installation effects on the soil strength and consequently the anchor pull-out capacity, first reconsolidation (set-up) of soil next to the anchor after installation is studied by a finite-element (FE) analysis of coupled deformation and fluid flow in porous media. The results of the set-up analysis indicate the rate of dissipation of excess pore-water pressure and soil-strength recovery. These are important considerations in predicting the anchor pull-out capacity at different times after installation. In the absence of a documented complete set of installation and set-up tests, the results are validated qualitatively using available albeit limited field test data.     

Distributed model predictive control for vessel train formations of cooperative multi-vessel systems

Recently, the cooperative control of multiple vessels has been gaining increasing attention because of the potential robustness, reliability and efficiency of multi-agent systems. In this paper, we propose the concept of Cooperative Multi-Vessel Systems (CMVSs) consisting of multiple coordinated autonomous vessels. We in particular focus on the so-called Vessel Train Formation (VTF) problem. The VTF problem considers not only cooperative collision avoidance, but also grouping of vessels. An MPC-based approach is proposed for addressing the VTF problem. A centralized and a distributed formulation based on the Alternating Direction of Multipliers Method (ADMM) are investigated. The distributed formulation adopts a single-layer serial iterative architecture, which gains the benefits of reduced communication requirements and robustness against failures. The impacts of information updating sequences and responsibility parameters are discussed. We furthermore analyze the scalability of the proposed method. Simulation experiments of a CMVS navigating from different terminals in the Port of Rotterdam to inland waterways are carried out to illustrate the effectiveness of our method. The proposed method successfully steers the vessels from different origins to form a vessel train. Due to the effective communication, vessels can timely respond to the velocity changes that others make. After the formation is formed, the distances between vessels become constant. The results show the potential to use CMVSs for inland shipping with enhanced safety.     

Experimental investigation on the dynamic responses of a free-hanging water intake riser under vessel motion

A large-scale model test of a free-hanging water intake riser (WIR) is performed in an ocean basin to investigate the riser responses under vessel motion. Top end of the WIR is forced to oscillate at given vessel motion trajectories. Fiber Brag Grating (FBG) strain sensors are used to measure the WIR dynamic responses. Experimental results firstly confirms that the free-hanging WIR would experience out-of-plane vortex-induced vibrations (VIVs) under pure vessel motion even for the case with a KC number as low as 5. Meanwhile, comparison between numerical results and experimental measurements suggests a significant drag amplification by out-of-plane vessel motion-induced VIV. What’s more, further study on WIR response frequencies and cross section trajectories reveals a strong correlation between vessel motion-induced VIV and local KC number distribution, owing to the small KC number effect. The presented work provides useful references for gaining a better understanding on VIV induced by vessel motion, and for the development of future prediction models.     

海上风机大直径单桩双钩翻身技术

中国海上风电是绿色能源的重要一支,现已进入大规模发展阶段,其中大直径无过渡段单桩是国内海上风电场主流基础形式。为高效、安全的进行大直径单桩施工,本文通过研究一种单台起重机双钩空中翻身的技术,采用左右大张角双钩起重机、大吨位吊梁、翻桩夹具等手段,在仅需一台大型起重设备的情况,完成了大直径单桩的翻身起重作业,提高了施工效率,降低海上风电场建造成本和安全风险。     

基于管道水力提升式采矿系统的深海采矿船总体设计研究

在分析目前国际主流管道水力提升式深海采矿系统的组成和采矿作业工程实际需求的基础上,对深海采矿船(水面支持系统)的主要功能、系统配备和布置特点进行研究。结合工程案例分析,提出商业化深海采矿船总体设计要求和发展趋势。通过研究,为将来商业性、标准化深海采矿船总体设计提供参考。