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Coupled numerical analysis of a concept tlb type floating offshore wind turbine 38

引用

asme 2019 38th International conference on Ocean, Offshore and Arctic engineering, OMAE 2019

作者： Ramzanpoor, Iman Nuernberg, Martin Tao, Longbin Department of Naval Architecture Strathclyde University Ocean and Marine Engineering GlasgowG4 0LZ United Kingdom

ISBN: (纸本)9780791858899

the main drivers for the continued decarbonisation of the global energy market are renewable energy sources. Moreover, the leading technological solutions to achieve this are offshore wind turbines. As installed capacity has been increasing rapidly and shallow water near shore sites are exhausted, projects will need to be developed further from shore and often in deeper waters, which will pose greater technical challenges and constrain efforts to reduce costs. Current floating platform solutions such as the spar and semisubmersible rely on large amounts of ballast and complex structural designs with active stabilisation systems for stability of the floating offshore wind turbine platform (FOWT). the primary focus of this study is to present a design concept and mooring arrangement for an alternative floating platform solution that places emphasis on the mooring system to achieve stability for a FOWT. the tension leg buoy (TLB) is designed to support future 10MW offshore wind turbine generators. this paper presents the numerical methodology used for a coupled hydro-elastic analysis of the floater and mooring system under combined wind, wave and current effects. A concept TLB design is presented and its platform motion and mooring line tension characteristics are analysed for a three-hour time domain simulation representing operating and survival conditions in the northern North Sea with water depths of 110 metres. the importance of wave drift forces and the other non-linear excitation forces in the concept design stage are evaluated by comparing the motion and tension responses of three different numerical simulation cases with increasing numerical complexity. the preliminary TLB system design demonstrated satisfactory motion response for the operation of a FOWT and survival in a 100-year storm condition. the results show that accounting for second-order effect is vital in terms of having a clear understanding of the full behaviour of the system and the detailed resp

关键词： Mooring

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Tie-in of a rigid pipeline to a flexible riser: design and installation — Challenges and lessons learnt 38

Tie-in of a rigid pipeline to a flexible riser: Design and i...

引用

asme 2019 38th International conference on Ocean, Offshore and Arctic engineering, OMAE 2019

作者： Curti, Gianbattista Lirola, Francois Pirinu, Gianluigi Pavone, Diego Perrin, Frederic Saipem SpA Fano Italy Saipem SA Saint Quentin Yvelines France

ISBN: (纸本)9780791858806

this paper presents the experience made with the engineering and execution of the tie-in of flexible risers to rigid pipelines on a project recently completed in West Africa. Five production and injection pipelines (10" and 6") were tied back to the host platform with flexible risers, in Lazy wave configurations, in ~600m water depth. the risers are directly connected to the terminations structures (PLETs) of the rigid pipelines, through horizontal connection systems. the structures forming the tie-in (risers, PLETs and pipelines) have been designed to accommodate axial displacements of the pipelines in the range 0.3m to 1.0m, as positive displacements (expansions) and -0.1m to -0.7m as negative displacements (contractions) of the pipelines, respectively towards and away from the risers, due to pipelines thermal expansions and pipe walking. Note that along some of the lines anchoring structures have been installed to control pipe walking. the tie-in interface loads were to be limited, in order not to threaten the flexible pipe, the PLETs and the connectors, and, despite the small pipeline end displacements, keeping the interface loads within allowable values, was a challenge. the positive displacements were causing interface loads as high as 80% of the allowable values, while the negative displacements were causing up to 90% utilization of the capacity of the connectors and 95% of the allowable loading of the foundations of the PLETs. the main drivers of such high loadings are the stiffness of the flexible pipe, combined with the layout of the tie-in. Extensive in place analyses were done to simulate the effects of progressive displacements of the pipelines, the pipe-soil interactions and the specifics of the behaviour of the flexible pipes (hysteretic stiffness). Full 3D FE analyses of the foundations (mud mats) of the PLETs were done, to circumvent the limitations of a classical bearing capacity analysis approach. As built information were also used, to remove som

关键词： Stiffness

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EXPERIMENTAL MEASUREMENTS OF WINDFLOAT 1 PROTOTYPE RESPONSES AND COMPARISON WIth NUMERICAL MODEL 37

EXPERIMENTAL MEASUREMENTS OF WINDFLOAT 1 PROTOTYPE RESPONSES...

引用

37th asme International conference on Ocean, Offshore and Arctic engineering

作者： Cermelli, Christian Leroux, Charlotte Dominguez, Sandra Diaz Peiffer, Antoine Principle Power Aix En Provence France Principle Power Emeryville CA USA

ISBN: (纸本)9780791851319

this paper presents experimental results of WindFloat 1 platform and comparisons with the numerical model developed by Principle Power. the WindFloat platform is designed to support multi-megawatt wind turbines. A full-scale prototype was installed offshore Portugal from 2011 to 2016, and produced 17GWh into the Portuguese grid. An extensive monitoring system was installed, including a wave rider buoy, 6-degrees of freedom measurement devices, anemometers, strain gauges, turbine monitoring instruments. Important results obtained during the measurement campaign are described in this paper. these include power predictions, turbine and tower loads, and platform motions. Comparison with numerical simulations are also provided. the numerical analysis methodology includes fully coupled simulations, based on Orcaflex, a commercially available state-of-the-art software to compute the hydrodynamic response of floating systems, combined in the time-domain with FAST, a well-established numerical tool for the design of wind turbines. Results of these comparisons show that the numerical tools are fit for purpose, and were used to calibrate some hydrodynamic coefficients that cannot be obtained accurately with numerical analysis or scaled model tests.

关键词： Computer simulation engineering prototypes

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Application of pipestress and ansys in stress analysis of nuclear pipe support - Case study 10

Application of pipestress and ansys in stress analysis of nu...

引用

10th International conference Machine and Industrial design in Mechanical engineering, KOD 2018

作者： Dizdar, S. Vucina, A. Rasovic, N. Tomovic, R. BerDiz Consulting AB Ranangsgatan 8-10 Göteborg41664 Sweden University of Mostar Faculty of Mechanical Engineering Computing and Electrical Engineering Matice hrvatske bb Mostar88000 Bosnia and Herzegovina University of Montenegro Mechanical Engineering Faculty Bul. Dzorda Vasingtona bb Podgorica81000 Montenegro

A power uprate of the nuclear power plant will affect some systems, which will be exposed to new loads, transients and operating parameters. After defining of new loads, transients and operating conditions, work to qualify a system begins with modelling of this pipe system as well as modelling of supports which are active in the system. Pipe supports in pipe model are defined depending on the supports function and also their correct stiffness. After analysis is done, reaction forces are obtained in points where pipe supports are defined in the pipe model. Reaction forces from pipestress analysis, in the points where pipe supports are defined, becomes attacking forces in pipe supports analysis. A complete calculation of support is explained as well as the way to use required standard. the calculation includes stiffness calculation, calculation of membrane stress and membrane plus bending stress. In order to qualify the support a limit load analysis is performed. Finally, it is showed that pipe support could be qualified according to the standard asme NF-3200. this paper describes use of software Pipestress and Ansys in stress analysis of piping systems and pipe supports. © 2018 Institute of Physics Publishing. All rights reserved.

关键词： Stress analysis

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Mooring System design Approach, a case study for MARMOK-A floating OWC Wave Energy Converter 37

Mooring System Design Approach, a case study for MARMOK-A fl...

引用

37th asme International conference on Ocean, Offshore and Arctic engineering

作者： Touzon, Imanol de Miguel, Borja Nava, Vincenzo Petuya, Victor Mendikoa, Inigo Boscolo, Francesco Tecnalia R&I Bilbao Spain Univ Basque Country UPV EHU Dept Mech Engn Bilbao Spain Oceantec Energias Marinas Bilbao Spain Basque Ctr Appl Math Bilbao Spain

ISBN: (纸本)9780791851319

this paper presents a methodology and a flowchart of steps to take for a, consistent and rapidly convergent design of catenary mooring systems. It is subsequently applied for a floating Oscillating Water Column WEC MARMOK-A developed by Oceantec Energias Marinas, in order to fulfill the technical requirements of such dynamic systems. the approach, based on the catenary equations, considers the water depth as a design scale factor for the mooring system, leading to an equivalent static mooring performance. In general, a mooring system configuration is described by the number and distribution of lines;thus, as a preprocess in the herein described procedure, a database is built for different line lengths. the main advantage of the procedure is that once that, after characterizing a mooring system configuration at a specific water depth with a specific line mass and axial stiffness, the database built can be used for any other water depth with any line mass and axial stiffness, accelerating the design optimization process. Mooring static properties are derived for a given material elastic modulus, lines' mass and water depth. the mean offset and horizontal stiffness are afterwards derived with lines pretension and steady environmental forces (mean wave drift, current and wind) as well as maximum offset and characteristic line tensions. Finally, the process is applied for different lines pretensions to achieve an objective horizontal stiffness of the structure. the introduced procedure is presented through its application to the MARMOK-A device at a 90m depth site moored by means of a Karratu named mooring configuration. Results are presented in terms of total lines mass, device maximum expected excursion and required footprint for different horizontal stiffness and lines mass in order to give an insight of the impact on total plant cost indicators.

关键词： Mooring System design Quasi static analysis Wave Energy Conversion Oscillating Water Column Catenary lines

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NUMERICAL analysis ON HYDRAULIC POWER TAKE-OFF FOR WAVE ENERGY CONVERTER AND POWER SMOOthING MEthODS 37

NUMERICAL ANALYSIS ON HYDRAULIC POWER TAKE-OFF FOR WAVE ENER...

引用

37th asme International conference on Ocean, Offshore and Arctic engineering

作者： Yu, Yi-Hsiang Tom, Nathan Jenne, Dale Natl Renewable Energy Lab 15013 Denver W Pkwy Golden CO 80401 USA

ISBN: (纸本)9780791851319

One of the primary challenges for wave energy converter (WEC) systems is the fluctuating nature of wave resources, which require the WEC components to be designed to handle loads (i.e., torques, forces, and powers) that are many times greater than the average load. this approach requires a much greater power take-off (PTO) capacity than the average power output and indicates a higher cost for the PTO. Moreover, additional design requirements, such as battery storage, are needed, particularly for practical electrical grid connection, and can be a problem for sensitive equipment (e.g., radar, computing devices, and sensors). therefore, it is essential to investigate potential methodologies to reduce the overall power fluctuation while trying to optimize the power output from WECs. In this study, a detailed hydraulic PTO model was developed and coupled with a time-domain hydrodynamics model (WEC-Sim) to evaluate the PTO efficiency for WECs and the trade-off between power output and fluctuation using different power smoothing methods, including energy storage, pressure relief mechanism, and a power based setpoint control method. the study also revealed that the maximum power fluctuation for WECs can be significantly reduced by one order of magnitude when these power smoothing methods are applied.

关键词： Renewable energy wave energy converter power take-off (PTO) hydraulic PTO power-based setpoint control

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Exergy-Rational Utilization of Low-Enthalpy Geothermal Energy Resources and Exergy-Based Limitations 2

Exergy-Rational Utilization of Low-Enthalpy Geothermal Energ...

引用

2nd International Geothermal conference, GEOHEAT 2018

作者： Kilkis, Birol Baskent University Energy Engineering Graduate Program Head Eskisehir Yolu 20 km. Baglica Etimesgut Ankara06810 Turkey

Along with continuing the efforts of decoupling CO2 emissions from sustainable development, exergy-rational cities are becoming universally important. this statement does not mean that energy rationality and energy efficiency are ignored. But it is a fact that the mission of the First-Law of thermodynamics has been almost completed in a pretty good rate of success. Because the Second-Law is especially important and often ignored in geothermal energy, especially for low-enthalpy sources, now it is time to analyze such systems in terms of exergy. Within this context, ORC systems, which are touted as useful systems for utilizing low-enthalpy geothermal resources and ground-source heat pumps, are critically analyzed. In this context, two cases regarding an ORC, which is used only for power generation without utilizing its waste heat and a heat pump operating on grid power, were examined and was concluded that they are not exergetically sustainable, if they operate as individual systems. this study developed an analytical model, which reveals with case studies and examples that a broad hybridization of combining geothermal energy-based ORC technology, heat pumps, absorption units, thermal storage, and other renewable energy resources, like solar and wind provides sustainable and exergetically rational design solutions. New evaluation and rating metrics based on Rational Exergy Management Model were introduced. the option of incorporating low-enthalpy geothermal energy resources at about 80°C to support the model is evaluated. the Hydrogen City model is applied to a new settlement area with an expected 200,000 inhabitants to find that the proposed model can enable a nearly net-zero exergy district status. the results have implications for settlements using geothermal energy and hydrogen energy together towards meeting net-zero *** an enrichment of the multiple systems even in a simplistic manner in an exergy economy cycle analytically reduces CO2 emissions by abo

关键词： Exergy

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APPLICATION OF RELAP/SCDAPSIM/MOD4.1 TO thE analysis OF ADVANCED REACTOR/FLUID systems WIth LIQUID MOLTEN SALT IN thE PRESENCE OF NON-CONDENSABLE GASES 26

APPLICATION OF RELAP/SCDAPSIM/MOD4.1 TO THE ANALYSIS OF ADVA...

引用

26th International conference on Nuclear engineering (ICONE-26)

作者： Jiang, S. Perez-Ferragut, M. Fu, Z. Hohorst, J. K. Innovat Syst Software 3585 Briar Creek Ammon ID 83406 USA

ISBN: (纸本)9780791851463

In recent years, organizations both at home and abroad are actively carrying out a research on the Molten Salt Reactor systems (MSRs). For example, the Shanghai Institute of Applied Physics (SNAP), Chinese Academy of Science (CAS), is currently involved in the design and development of a 10MWth Solid Fuel thorium Molten Salt Reactor (TMSR-SF1). SNAP started their analysis of TMSR using an earlier version of RELAP/SCDAPSIM, MOD4.0. MOD4.0 included models and correlations for molten salts but was unable to treat molten salts in the presence of non-condensable gases. Since that time SNAP and ISS have worked in parallel to extend the models and correlations for such systems. the SNAP modified code, using SNAP proprietary models and correlations, is described in the "open literature" under the name RELAP5-MSR. More general, but comparable, models developed by ISS for liquid metals/salts in the presence of non-condensable have been incorporated into RELAP/SCDAPSIM/MOD4.1. this extended option is currently being implemented for Li-Pb, Pb-Bi, molten salts, and Na. the paper describes the general approach used to treat the presence of non-condensable gases with liquid metals/salts as well as any specific MOD4.1 models and correlations used for molten salts. the paper then describes the example of applying the code to the analysis of both steady state and Station Black Out (SBO) transient for the proposed TMSR-SF1 design.

关键词： RELAP/SCDAPSIM/MOD4.0 Non-condensable Gas Liquid Molten Salt TMSR-SF1

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Development methods for 2030: An interpretation of scenarios in the application of methods 13

Development methods for 2030: An interpretation of scenarios...

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13th biennial Norddesign conference, Norddesign 2018

作者： Albers, Albert Bursac, Nikola Marthaler, Florian Siebe, Andreas Reiß, Nicolas Hirschter, Tobias IPEK - Institut für Produktentwicklung Kaiserstraße 10 Karlsruhe Germany ScMI Scenario Management International AG Klingenderstraße 10-14 Paderborn Germany

ISBN: (纸本)9789176851852

Using the scenario analysis, context scenarios of the application of methods were derived, for the strategic orientation of development method research. the scenarios of the application of methods are interpreted in this article. For this purpose, a multi-level concept was developed, in which in a first step an expert study with alumni and employees of the IPEK - Institute of Product engineering of the Karlsruhe Institute of Technology (KIT) was carried out with 32 participants. the participants of the study were presented with concise short videos that illustrate the application of development methods in the respective scenario. the respondents' task was to evaluate the scenarios with regard to the actual situation, desired image and probability of occurrence as well as to identify the opportunities, risks and relevant research priorities of the scenarios. the results of the studies were then consolidated step-by-step in the expert team into a total of seven research clusters and linked with a network analysis. After a brief description of the scenarios of the application of methods, these are discussed in the results of this article with the aim of addressing specific short, medium and long-term research incentives. © Proceedings of Norddesign: design in the Era of Digitalization, Norddesign 2018. All rights reserved.

关键词： Application of methods Methodological research Scenario technique systems engineering

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AN INDUCTIVE, design-CENTRIC APPROACH TO CONTROL engineering EDUCATION WIth A COMPETITIVE ATMOSPHERE

AN INDUCTIVE, DESIGN-CENTRIC APPROACH TO CONTROL ENGINEERING...

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10th asme Annual Dynamic systems and Control conference

作者： Foong, Shaohui Subburaj, Karupppasamy Wood, Kristin L. Singapore Univ Technol & Design Engn Prod Dev EPD Pillar Singapore Singapore

ISBN: (纸本)9780791858295

Control engineering is a cornerstone of most undergraduate engineering programs in colleges and universities around the world. the analysis and synthesis of automatic controllers, in particular, the PID controller, is a central focus of these courses and modules. However, due to its highly abstract nature, students usually find the content challenging and difficult to comprehend. this is aggravated by the employment of traditional lecture/recitation deductive teaching formats as means of delivery of the content. Here, an inductive-based week long design activity strategically held in the middle of the semester was conceived to introduce and motivate the notion of feedback control. During the course of the week, students in teams design, analyze and synthesize automatic controllers to enable a standardized differential wheeled robotic platform to traverse a line circuit autonomously. the strategy to achieve this capability is intentionally left to be open-ended, and students have the design freedom to select and position sensors needed to sense the track, as well as implement and troubleshoot the programming required to enable autonomous control. the activity culminates with a pulsating head-to-head single elimination tournament to decide the overall champion.

关键词： Control engineering design Education

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