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Day 2 Wed, September 28, 2022最新文献

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Organic Rankine Cycle/Thermal Tower: Lower Cruise Ship Reverse Osmosis Costs 有机朗肯循环/热塔:降低游轮反渗透成本
Pub Date : 2022-09-19 DOI: 10.5957/smc-2022-077
Eric C. Leonhardt, Don Jeter
A novel combination of an Organic Rankine Cycle (ORC) and a hydration-dehydration Thermal Tower (TT) provides a potential source of pressurized water for a reverse osmosis (RO), desalination plant for a cruise ship. An analysis of the combined ORC-TT has been applied to a Wärtsilä 12V46F 14.4 MW diesel to provide an additional 560 kW shaft power and a source of evaporated seawater of 0.824 cubic meters per hour (0.229 kg/s). The water is available at 7 bar pressure at the bottom of a 70m Thermal Tower. The system features two separate ORC bottoming cycle turbines. The system uses a thermal heat exchange fluid to remove heat from the charge air cooler for the compressed air engine inlet, as well as the engine cooling liquid. Another exhaust-to-liquid cooler is used to remove energy from the exhaust downstream of the turbocharger. The heated fluid then passes through a high temperature ORC unit and a low temperature ORC unit. The high temperature ORC can generate up to 409 kW and the low temperature unit 155 kW. The remaining energy in the heat transfer fluid is used via a 70-meter hydration – dehydration Thermal Tower to heat seawater to evaporate water. The combined system offers additional shaft power while providing a source of desalinated water to reduce the load on reverse osmosis water purification systems.
有机朗肯循环(ORC)和水合脱水热塔(TT)的新组合为游轮的反渗透(RO)海水淡化厂提供了潜在的加压水来源。结合ORC-TT的分析已应用于Wärtsilä 12V46F 14.4 MW柴油,可提供额外的560千瓦轴功率和0.824立方米/小时(0.229千克/秒)的蒸发海水来源。在70米高的热塔底部,水的压力为7巴。该系统具有两个独立的ORC底循环涡轮机。该系统使用热交换流体从压缩空气发动机入口的增压空气冷却器以及发动机冷却液中去除热量。另一个排气-液体冷却器用于从涡轮增压器下游的排气中去除能量。然后加热的流体通过一个高温ORC单元和一个低温ORC单元。其中,高温ORC输出功率为409kw,低温ORC输出功率为155kw。传热流体中的剩余能量通过70米的水合脱水冷却塔加热海水以蒸发水分。联合系统提供额外的轴动力,同时提供淡化水的来源,以减少反渗透水净化系统的负荷。
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引用次数: 0
Hydrogen for Marine Power and Propulsion: Regulatory and Classification Considerations 船用动力和推进用氢:法规和分类考虑
Pub Date : 2022-09-19 DOI: 10.5957/smc-2022-045
Meg Dowling, T. Meyers, Domenic Carlucci, Richard D. Delpizzo
As the maritime industry moves towards a net zero carbon operation, hydrogen fuel and fuel cells are being considered as a promising solution. This paper offers guidance to marine designers of ships using hydrogen fuel and fuel cell power and/or propulsion, addressing both the Classification society requirements and regulatory process throughout the ship acquisition period, with a focus on U.S. Flag considerations. Steps in the review process include Approval in Principle (AIP), risk assessments and current regulatory and classification design basis strategies. Included is a review of the applicable U.S. and international regulatory framework for hydrogen powered engines and fuel cell propulsion.
随着海运业向净零碳运营迈进,氢燃料和燃料电池被认为是一种很有前途的解决方案。本文为使用氢燃料和燃料电池动力和/或推进装置的船舶设计师提供了指导,解决了船级社的要求和整个船舶采购期间的监管过程,重点是美国国旗的考虑。审查过程的步骤包括原则性批准(AIP)、风险评估以及当前的监管和分类设计基础策略。其中包括对适用于氢动力发动机和燃料电池推进的美国和国际监管框架的审查。
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引用次数: 0
Making the Case for Knowledge Provisioning in the Marine Industry 为海洋工业提供知识提供案例
Pub Date : 2022-09-19 DOI: 10.5957/smc-2022-051
Victoria Dlugokecki, Steve Boisvert, Lisa Elles, Maurissa D'Angelo, Patrick Schlapp
The paper will provide background on the concept of Knowledge Provisioning and explain how it can provide shipyards, ship owners, and the design/engineering community a competitive advantage in efforts to reduce the cost of ship design, building and repair. The key principles of Knowledge Provisioning will be discussed along with key technologies for implementing Knowledge Provisioning, including connecting to 3D Product Models, and the use of Artificial Intelligence and Augmented Reality. The paper will describe the Knowledge Provisioning roadmap taken thus far and current and future implementation efforts. The paper will also discuss several case studies with their supporting business cases to provide a framework for others in the marine industry to understand the cost benefits of using Knowledge Provisioning.
本文将提供知识供应概念的背景,并解释它如何为船厂,船东和设计/工程社区提供竞争优势,以降低船舶设计,建造和维修的成本。知识供应的关键原则将与实施知识供应的关键技术一起讨论,包括连接到3D产品模型,以及使用人工智能和增强现实。本文将描述迄今为止的知识供应路线图以及当前和未来的实现工作。本文还将讨论几个案例研究及其支持业务案例,为海洋行业的其他人提供一个框架,以了解使用Knowledge Provisioning的成本效益。
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引用次数: 0
Evolution of Evolution of Titanic Breakup Theories and the Accepted SNAME MFC Theory 泰坦尼克号解体理论的演化与公认的SNAME MFC理论
Pub Date : 2022-09-19 DOI: 10.5957/smc-2022-009
R. Roddy, W. Lange, E. V. Nesmeyanov, Rickie Lee Woytowich
Ever since Titanic was found in 1985 and it was discovered that the ship did not sink intact there have been a number of theories as how the ship’s hull failed. This paper will discuss several of these theories and discuss the reasons for the necessity of superseding them as new information was discovered. Presented herein is the latest theory explaining the breakup accepted by the SNAME Marine Forensics Committee complete, with supporting evidence.
自从1985年泰坦尼克号被发现后,人们发现这艘船并没有完整沉没,就有很多关于船体损坏的理论。本文将讨论其中的几个理论,并讨论随着新信息的发现,有必要取代它们的原因。本文介绍了SNAME海洋法医委员会接受的最新理论,并附有支持证据。
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引用次数: 0
Modeling of Autonomous Hydrofoil Craft Avoiding Moving Obstacles 自主水翼艇避障建模
Pub Date : 2022-09-19 DOI: 10.5957/smc-2022-017
K. Matveev
Hydrodynamic arrangements of most autonomous surface marine vessels belong to conventional displacement-type monohulls or catamarans. Applications of advanced hydrodynamic concepts, such as considered here hydrofoils, can help unmanned marine craft operate efficiently at higher speeds and have better seakeeping. However, dynamics of such boats are rather complex. In this work, a 6-DOF dynamics model with engineering correlations for hydrodynamic forces is applied to simulate motions of an autonomous hydrofoil craft. Collision avoidance maneuvers based on introduction of a dynamic waypoint outside unsafe zone around a moving obstacle have been modeled. The description of planning decisions, implementation of controls, simulated boat trajectories, and time histories of kinematic and controlled variables are presented and discussed. The developed model can be used for design of unmanned hydrofoil craft and control systems of fast autonomous boats.
大多数自主水面船舶的水动力布置都属于传统的排水量型单体或双体船。先进的水动力概念的应用,如这里所考虑的水翼,可以帮助无人驾驶船舶在更高的速度下有效地运行,并具有更好的耐波性。然而,这种船的动力学相当复杂。本文采用具有工程相关性的六自由度水动力模型对自主水翼艇的运动进行了仿真。建立了在不安全区域外引入动态航路点的避碰机动模型。规划决策的描述,控制的实施,模拟船的轨迹,以及运动和控制变量的时间历史被提出和讨论。该模型可用于无人水翼艇和快速自主艇控制系统的设计。
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引用次数: 0
Optimum Design of Extra-Large Wind Turbine Monopile Covering Multiple Conditions 超大型风力机多工况单桩优化设计
Pub Date : 2022-09-19 DOI: 10.5957/smc-2022-081
Matteo Bucchini, Zhiyong Yang, R. Basu, Aimin Wang, W. Lee, G. Baxter, R. Sielski, Raffaele Frontera, Gabriele Degrassi
Offshore wind energy is developing rapidly in the United States, particularly off the East coast, which has an extensive continental shelf and where the water depths are such that monopile wind turbines founded directly on the seabed are the most attractive. In a previous paper, the authors demonstrated how the design of a monopole for a 15-MW turbine can be optimized to survive hurricane conditions using several commercially available design tools. This paper extends the study to address multiple loading conditions, including operational working conditions. To do that, different optimizations were run in parallel to find a global solution for multidisciplinary optimization. In the previous study, three independent design tools were used: Wind-plant Integrated System Design and Engineering Model (WISDEM) which was developed by the National Renewable Energy Laboratory (NREL), ANSYS Workbench, a finite element analysis program commonly used in the industry, and the ModeFRONTIER integration platform. To simulate the additional loading conditions, the OpenFAST software from NREL is now included in the workflow to estimate the loads in the different conditions examined.
海上风能在美国发展迅速,特别是在东海岸,那里有广阔的大陆架,水深使得直接建在海床上的单桩风力涡轮机最具吸引力。在之前的一篇论文中,作者展示了如何使用几种商业上可用的设计工具来优化15mw涡轮机的单极子设计,使其在飓风条件下存活下来。本文将研究扩展到包括操作工况在内的多种加载条件。为此,并行运行不同的优化,以找到多学科优化的全局解决方案。在之前的研究中,使用了三种独立的设计工具:由国家可再生能源实验室(NREL)开发的风电场集成系统设计与工程模型(WISDEM)、行业常用的有限元分析程序ANSYS Workbench和ModeFRONTIER集成平台。为了模拟额外的负载条件,NREL的OpenFAST软件现在包含在工作流程中,以估计不同条件下的负载。
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引用次数: 0
Unsteady Numerical Hydrodynamics of a Rowing Shell Under Surge Excitation 激波激励下桨壳非定常数值流体力学
Pub Date : 2022-09-19 DOI: 10.5957/smc-2022-080
Calder J. Hartigan, A. S. Onas
The effect of oscillating harmonic surge motions on a Wigley hull in deep and shallow water was investigated numerically using unsteady Reynolds-Averaged Navier Stokes (URANSE) CFD simulations in a three-dimensional computational domain. The frequency and amplitude of the surge motions were varied independently and validated using experimental data. The URANSE CFD simulations were validated by comparison with the experimental results and unsteady thin-ship resistance predictions of Doctors et al. (2010). The numerical results show reasonable agreement with rowing shells experimental data and for the most part follow the expected trends across the entire operating range of Froude numbers. However, in this first iteration several discrepancies have been identified between the CFD simulations and the experimental results, especially across the frequency-response metrics. The numerical approach in this unsteady hydrodynamics analysis does indicate that with further adjustments and improvement of the quality of the computational domain, the more complex URANSE CFD simulations have the potential to provide a powerful alternative to experimental testing.
采用三维计算域非定常reynolds - average Navier Stokes (URANSE) CFD模拟方法,对Wigley船体在深水和浅水中振荡谐波浪涌运动的影响进行了数值研究。脉动运动的频率和幅度是独立变化的,并通过实验数据进行了验证。通过与Doctors et al.(2010)的实验结果和非定常薄船阻力预测对比,验证了URANSE CFD模拟的正确性。计算结果与桨壳实验数据吻合较好,在整个弗劳德数范围内基本符合预期趋势。然而,在第一次迭代中,在CFD模拟和实验结果之间发现了一些差异,特别是在频率响应指标上。该非定常流体动力学分析的数值方法表明,随着计算域质量的进一步调整和提高,更复杂的URANSE CFD模拟有可能为实验测试提供强大的替代方案。
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引用次数: 0
Automated Detail Planning and Control for First-of-Class Projects Using Product-Based-Planning and Yard Specific 使用基于产品的计划和特定场址的一流项目的自动化详细计划和控制
Pub Date : 2022-09-19 DOI: 10.5957/smc-2022-024
Ronald de Vries, E. Bjorkner, Patrick D. Roberts
This paper describes the benefits of capturing yard specific value streams to apply automated detail planning and control efforts for first-of-class projects. Allowing the recognition of over 90% of the relations, dependencies and constraints for the operational process prior to the completion of the engineering model. Creating the ability to integrate the need by dates from production with the workload and priorities for the engineering team’s schedule to cut back on overall lead-time. Through rolling wave-planning methods and direct integrations with the engineering 3D detailed design model automated sequencing, budgeting (hours/duration), resource allocation and progress recognition takes place in a yard control framework. This allows for closed feedback loops on operational performance as well as the instant recognition of progress, consumed hours, load-views, deviations and risks by direct roll ups to the project control level.
这篇论文描述了获取特定场址价值流的好处,从而为一流的项目应用自动化的详细计划和控制工作。允许在工程模型完成之前识别操作过程中超过90%的关系、依赖和约束。能够将生产需求与工作量和工程团队计划的优先级相结合,从而缩短整体交付时间。通过滚动波浪规划方法和与工程3D详细设计模型的直接集成,自动排序,预算(小时/持续时间),资源分配和进度识别在一个码控制框架中进行。这允许对操作性能进行封闭的反馈循环,以及通过直接滚动到项目控制级别来即时识别进度、消耗的时间、负载视图、偏差和风险。
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引用次数: 0
The Performance of Oily Water Separators from an Operational Perspective 从操作角度看油水分离器的性能
Pub Date : 2022-09-19 DOI: 10.5957/smc-2022-010
Gavin Alexander Henderson, Rabiul Islam
This study explores the effects of pre-treatment on oily water separator performance at the shipboard level. An online survey of marine personnel was carried out, in which respondents were asked to rate the performance of separator systems and to provide technical information. The results of the study indicated that the use of pre-treatment resulted in improved effectiveness ratings of between 11 & 18%, with increases of between 14 & 43% found for the failure running hours. Given these findings, it was concluded that the use of pre-treatment offers a relatively simple method of improving oily water separator performance, and that there is a need for the International Maritime Organization to further encourage its use via legislation.
本研究从船载层面探讨了预处理对油水分离器性能的影响。对海事人员进行了一项在线调查,要求受访者对分离器系统的性能进行评级并提供技术信息。研究结果表明,预处理的使用提高了11% ~ 18%的效率等级,故障运行时间增加了14% ~ 43%。综上所述,预处理是一种相对简单的提高油水分离器性能的方法,国际海事组织有必要通过立法进一步鼓励使用预处理。
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引用次数: 0
Second Generation Intact Stability Criteria: An Overview 第二代完整稳定性标准:概述
Pub Date : 2022-09-19 DOI: 10.5957/smc-2022-049
W. Peters, Vadim I. Belenky
The Interim guidelines on the second generation intact stability criteria were approved by IMO’s Maritime Safety Committee (MSC) in December 2020 (MSC.1/Circ.1627). These were followed by MSC’s approval of Explanatory Notes to the Interim guidelines in April 2022. Under development internationally for nearly two decades, the second generation intact stability criteria are, in most respects, based on the assessment of the dynamics of stability failures. Therefore, they are unlike previous stability criteria that evaluate quantities of various common static stability parameters against established, but arbitrary, standards for compliance. This paper provides an overview of the second generation intact stability criteria, explains how it is intended to be used, its relationship to existing international ship stability criteria, and describes a process by which practicing naval architects may use it. The paper also identifies possible shortcomings of the criteria and areas in which particular caution should be exercised in its use. Lastly, proposals for future enhancement of the criteria are summarized.
2020年12月,IMO海上安全委员会(MSC)批准了第二代完整稳定性标准的临时指南(MSC.1/Circ.1627)。随后,MSC于2022年4月批准了临时指导方针的解释性说明。经过近二十年的国际发展,第二代完整稳定准则在大多数方面是基于对稳定失效动力学的评估。因此,它们不同于以前的稳定性标准,即根据已建立的但任意的符合性标准评估各种常见静态稳定性参数的数量。本文概述了第二代完整稳定性标准,解释了如何使用它,它与现有国际船舶稳定性标准的关系,并描述了实践造船师可以使用它的过程。该文件还指出了这些标准可能存在的缺点,以及在使用这些标准时应特别谨慎的领域。最后,总结了今后加强这些标准的建议。
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引用次数: 0
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Day 2 Wed, September 28, 2022
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