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检索条件"任意字段=10th ASME Biennial Conference on Engineering Systems Design and Analysis"

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SQUALL DETECTION AND analysis FROM HISTORICAL SATELLITE DATA 38

引用

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

作者： Renac, L. Hurdle, D. P. Enet, F. J. M. De Vroom, J. Aktis Hydraul Bv Coastal Metocean Grp Zwolle Netherlands Aktis Hydraul Bv Zwolle Netherlands Argoss Houten Netherlands

ISBN: (纸本)9780791858783

thunderstorms and squalls (fronts of contiguous thunderstorms) are associated with short but intense local winds that have a great impact on operability or design conditions for moored ship operations in the coastal zone. the brevity and local scale of such events makes them difficult to capture using standard measurement data and usually requires dedicated long-term measurement campaigns. Because the standard measurements available are usually based on 10-minute averages taken once an hour, such data is often not available. In the absence of conventional measured data, the use of satellite data can provide useful design data if analyzed and applied with caution. We present two case studies (West Africa and Brazil) where squalls have been identified in satellite data and used for extreme value analysis (EVA) to support the design of intermediate water depth mooring systems. the detection of squalls is confirmed with satellite imagery and the handling of this data for the EVA is presented in detail with assumptions made and the sensitivity of the results to these assumptions. the impact on design values is also discussed for both geographic locations.

关键词： Satellites design Mooring Storms Water Shorelines Ships Locations

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ESTIMATING EXTREME WAVES IN thE GULF OF MEXICO USING A SIMPLE SPATIAL EXTREMES MODEL 38

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

作者： Wada, Ryota Jonathan, Philip Waseda, Takuji Fan, Shejun Univ Tokyo Tokyo Japan Shell Res Ltd London England Univ Lancaster Lancaster England Shell Oil Co Houston TX 77252 USA

ISBN: (纸本)9780791858882

We seek to characterize the behavior of extreme waves in the Gulf of Mexico, using a 109 year-long wave hindcast (GOMOS). the largest waves in this region are driven by strong winds from hurricanes. design of offshore production systems requires the estimation of extreme metocean conditions corresponding to return periods from 1 year to 10,000 years and beyond. For extrapolation to long return periods, estimation using data for around 100 years from a single location will incur large uncertainties. Approaches such as spatial pooling, cyclone trackshifting and explicit track modeling have been proposed to alleviate this problem. the underlying problem in spatial pooling is the aggregation of dependent data and hence underestimation of uncertainty using naive analysis;techniques such as block-bootstrapping can be used to inflate uncertainties to more realistic levels. the usefulness of cyclone track-shifting or explicit track modeling is dependent on the appropriateness of the physical assumptions underpinning such a model. In this paper, we utilize a simple spatial statistical model for extreme value estimation of significant wave height under tropical cyclones, known as STM-E, proposed in Wada et al. (2018). the STM-E model was developed to characterize extreme waves offshore Japan, also dominated by tropical cyclones. the method relies on the estimation of two distributions from a sample of data, namely the distribution of spatio-temporal maximum (STM) and the exposure (E). In the current work, we apply STM-E to extreme wave analysis in Gulf of Mexico. the STM-E estimate provides a parsimonious spatially-smooth distribution of extreme waves, with smaller uncertainties per location compared to estimates using data from a single location. We also discuss the estimated characteristics of extreme wave environments in this region.

关键词： Waves Gulf of Mexico Uncertainty Modeling Ocean engineering Underpinning design Manufacturing systems Significant wave heights

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EXTREME LOAD COMPUTATIONAL FLUID DYNAMICS analysis AND VERIFICATION FOR A MULTIBODY WAVE ENERGY CONVERTER 38

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

作者： van Rij, Jennifer Yu, Yi-Hsiang McCall, Alan Coe, Ryan G. Natl Renewable Energy Lab Golden CO 80401 USA Ecomerit Technol Santa Barbara CA USA Sandia Natl Labs POB 5800 Albuquerque NM 87185 USA

ISBN: (纸本)9780791858899

A wave energy converter (WEC) must be designed to survive the extreme sea states that it will be subject to throughout its lifetime. Although there are many analysis methods and codes available to accomplish this, there are currently several engineering challenges to WEC survival design. Foremost, the computational design approach will typically involve a trade-off between accuracy and computational efficiency. Additionally, most computational fluid dynamics (CFD) codes are not ideally suited to modeling extreme events for WECs with multibody dynamics, power-take-off systems, and mooring systems. Finally, although WEC design standards and CFD guidelines are emerging, with the current immaturity of the WEC industry, they are not yet well established. In this study, loads on a 1:35-scale, moored, multibody WEC are evaluated with CFD. the CFD results are compared with results obtained from a computationally efficient, midfidelity model based on linearized potential flow hydrodynamics. For these model verification comparisons, both operational and survival configurations are considered. the extreme load results obtained, using both codes, indicate that the survival configuration successfully sheds loads during extreme sea states. It is also found that WEC-Sim, when appropriately applied, can provide reasonable load results, at a fraction of the computational expense of CFD. However, for the more extreme sea states, and for higher-order effects not included in the WEC-Sim model, the linear-based results have significant errors in comparison to the CFD-based results, and should be used judiciously.

关键词： wave energy converter extreme/design loads computation fluid dynamics

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IMPROVED FATIGUE design OF SCR MODIFIED MINER'S RULE 38

IMPROVED FATIGUE DESIGN OF SCR MODIFIED MINER'S RULE

引用

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

作者： Knagenhjelm, Hans Olav Hauge, Mons Nyhus, Bard Equinor Oslo Norway Equinor Trondheim Norway SINTEF Trondheim Norway

ISBN: (纸本)9780791858813

the Aasta Hansteen floating production system is the first SPAR platform with steel catenary risers (SCR) at the Norwegian Continental Shelf (NCS). the water depth is 1300 msw. the weather conditions with respect to wave loading are more severe than any offshore installation completed so far. Under such environmental conditions, it is vital to verify the design of the SCR's with respect to extreme loading and fatigue life. A fatigue verification program has been executed for ground OD welds of both clad and carbon steel riser materials. the objective was to determine the effect of weld defects in combination with the effect of variable amplitude loading using the actual fatigue stress distribution experienced by critical parts of the SCR. the stress distribution is based on the local wave spectrum and estimated from hydrodynamic analysis of the riser and the long-term wave statistics. Two clad pipes and one carbon steel pipe was exposed to rotation bending fatigue testing with artificially imposed defects. One clad pipes gave fracture after more than 1.0x10(9) cycles. the carbon steel pipe gave fracture after 4.56x10(8) cycles. A modified Miner's summation rule is proposed for variable amplitude fatigue design. the procedure is based on a verification of variable amplitude testing against constant amplitude testing. the results indicate that load amplitudes below a fatigue limit defined at 10(7) cycles are not contributing significantly to fatigue crack initiation and growth from a weld defect. the proposed method suggests an engineering approach to this by a modification of the Miner's rule for VA loading.

关键词： Fatigue design Pipes Carbon steel Waves Cycles Fracture (Process) Pipeline risers Risers (Casting) Stress concentration Fatigue Testing Fracture (Materials) design Fatigue life Fatigue testing Manufacturing systems Offshore installations Rotation Stress Municipal solid wastes Welded joints Spar platforms Water Steel catenary risers Fatigue limit Statistics as topic Fatigue cracks

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ON design AND analysis OF A DRIVETRAIN TEST RIG FOR WIND TURBINE HEALth MONITORING 38

引用

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

作者： Balestra, Lorenzo Nejad, Amir R. Naldi, Giovanni Univ Bologna Dept Ind Engn I-40126 Bologna Italy Norwegian Univ Sci & Technol Dept Marine Technol NO-7491 Trondheim Norway

ISBN: (纸本)9780791858899

the reliability of offshore wind turbines is a key factor when estimating maintanence costs, downtime due to component failure and overall efficiency during operational life. Offshore wind turbines have limited accessibility and operate in harsh environments and, as a result, it is difficult to perform frequent checks on electrical and mechanical component. Drivetrain test rigs (DTR) are crucial to the task of: validating the design of new components to avoid early life failure, observe the behaviour of components under load over long periods of time in a controlled environment and produce a maintanence plan that minimize costs and frequency of intervention. In this paper, after a brief introduction on the state of the art in DTR technology, is described a methodology that can be used to create an effective conceptual design for a drivetrain test rig, focusing also on the possible downscaling. the paper starts by analyzing the benefits of the drivetrain use in the wind power industry, bringing examples of real test rigs used in industrial and academical world. Once the topic is mastered it is possible to proceed with a description of the various phases needed to obtain the conceptual design, from the definition of layout to the preliminary 3D modeling. the test rig that is here designed, while inspired from full scale dynamometers used in the industry, is thought as a laboratory tool for academical use that can be used by students to investigate fault detection methods and health monitoring systems of wind turbines. It is also included a section dedicated to the possible techniques for downscaling the test rig, based on simple considerations of the drivetrain mechanical behaviour. Downscaling becomes a key factor when facing the need to test turbine components of ever increasing dimensions in laboratories with limited space and budget. the definition of a procedure to create a scaled version will allow laboratories to build test rigs of smaller dimension but with a

关键词： design Wind turbines Conceptual design Failure Offshore wind turbines Dimensions Dynamometers Reliability Stress Downtime Mechanical behavior Turbine components Turbines three-dimensional modeling Wind power Flaw detection Monitoring systems Damage Students

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Increasing the height of a guyed steel stack which is supported on an indutrial building 10

Increasing the height of a guyed steel stack which is suppor...

引用

10th International Structural engineering and Construction conference, ISEC 2019

作者： Okelo, Roman Russell, Bradford BR Architects and Engineers Richardson United States

ISBN: (纸本)9780996043762

the paper studied the rehabilitation and increase in height of an existing 30 ft tall, industrial, guyed steel stack, which was built around 1977. the stack is supported on an industrial building. Stacks are an essential part of the industrial facilities. they allow the discharge of chemical waste gases from industries to the atmosphere, under stringent pollution control guidelines. the height of the stack is increased by 40 ft to comply with the new guidelines. Analytical and numerical simulations were performed using MecaStack software (local model) and SAP2000 V.20 software (global model). analysis and design are based on the asme STS-1-2016 standard code. Discontinuity around the manhole at the bottom of the stack is investigated with SAP2000 V.20 finite element software. Results in terms of principle stresses, and Von-Mises stress, were used to prepare recommendations, repair and construction documents for the project. Copyright © 2019 ISEC Press.

关键词： Stress analysis

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analysis ON HYDRODYNAMIC RESPONSES OF A SPAR OFFSHORE WIND TURBINE WIth AN INNOVATIVE TYPE OF MOORING SYSTEM 38

引用

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

作者： Ma, Yuan Chen, Chaohe Yan, Xinkuan Shen, Yijun Fan, Tianhui South China Univ Technol Sch Civil Engn & Transportat Guangzhou Peoples R China

ISBN: (纸本)9780791858899

the mooring system is a key component connecting a floating offshore wind turbine (FOWT) to the seabed. Generally, the traditional mooring systems mainly control the horizontal motions of the floating platform. However, due to the existence of blades, tower structure and the requirement of power generation efficiency, there is a high requirement on the pitching performance when a platform is used for the floating wind turbine. therefore, an innovative type of mooring system which could improve the pitch performance of the FOWT is really needed. In this paper, considering the OC3-Hywind Spar floating wind turbine, based on the original type of 3 x 3 mooring system, an innovative type of mooring system which has a better control performance of the pitch of FOWT is designed. then, the hydrodynamic responses of the floating wind turbine platform are investigated. the influence of two different mooring system types on the hydrodynamic responses of the FOWT are compared and analyzed. the conclusions of this study could serve as a reference for the mooring system design of floating wind turbine systems.

关键词： Floating offshore Wind Turbine Spar-type Mooring System Hydrodynamic Response

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IMPACT OF HIGH ORDER WAVE LOADS ON A 10 MW TENSION-LEG PLATFORM FLOATING WIND TURBINE AT DIFFERENT TENDON INCLINATION ANGLES 38

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

作者： Milano, Daniel Peyrard, Christophe Capaldo, Matteo Ingram, David Xiao, Qing Johanning, Lars Univ Edinburgh IDCORE Edinburgh Midlothian Scotland EDF Lab Chatou Paris France EDF Lab Paris Saclay Paris France Univ Edinburgh Edinburgh Midlothian Scotland Univ Strathclyde Glasgow Lanark Scotland Univ Exeter Exeter Devon England

ISBN: (纸本)9780791858899

Floating wind technology is being developed rapidly with the aim of harvesting high-energy wind resources in medium and deep water areas, unreachable using fixed bottom solutions. Given the complexity of these systems, the interactions between the structure and incident hydro-aerodynamic forces need to be well understood. While numerous solutions are being explored, an optimal design is yet to be established within the industry. this study explores the effects of tendon inclination on the dynamic behaviour of a 10MW tension-leg platform (TLP) floating offshore wind turbine (FOWT), and the interaction of different design solutions with higher-order hydrodynamic loading. the model was subject to an extreme sea state in order to capture second and third-order wave effects, and the nonlinear waves were generated via the high-order spectral (HOS) method. the analysis was performed using the hydrodynamic engineering tool CALHYPSO, in-house developed by EDF Lab. Second and third order inertial hydrodynamic loads were included in the time-domain simulations in order to capture low frequency loads and ringing effects respectively. Results show that difference-frequency second order effects have a negligible impact on motions and tendon tensions of the analysed floating wind turbine model, while third order terms can significantly enhance the dynamic response of the system to extreme incident waves. While inclined-leg floater configurations presented improved motion and tendon tension responses under linear loading, the inclusion of quadratic and triple-frequency contributions showed that tendon inclination can in fact increase tension variations in the mooring lines when subject to extreme wave climates. this can lead to slacking in the mooring lines being observed more frequently in inclined-leg configurations. the results therefore suggest that neglecting third order effects, as commonly done in industry, can lead to significant underestimations of motion and tendon tensio

关键词： Stress Waves Tension-leg platforms Floating wind turbines Tendons Tension Wind design Mooring Offshore wind turbines Simulation engineering instruments engineering simulation Climate Dynamic response Wind turbines Water Nonlinear waves Seas

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FORCE DYNAMICS AND STATIONKEEPING COSTS FOR MULTILINE ANCHOR systems IN FLOATING WIND FARMS WIth DIFFERENT SPATIAL PARAMETERS 38

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

作者： Fontana, Casey Arwade, Sanjay DeGroot, Don Hallowell, Spencer Aubeny, Charles Diaz, Brian Landon, Melissa Ozmutlu, Senol Myers, Andrew Univ Massachusetts Amherst MA 01003 USA Texas A&M Univ College Stn TX USA Univ Maine Orono ME USA Vryhof Anchors Rotterdam Netherlands Northeastern Univ Boston MA 02115 USA

ISBN: (纸本)9780791858899

While the offshore wind industry has shown a steady trend towards floating turbines, costs of these systems remain high. A multiline anchor concept may significantly reduce the high cost offloating wind, in which floating turbines share anchors. this work investigates the potential cost benefit of implementing a multiline anchor system relative to the conventional single-line anchor system over a range of spatial parameters. the OC4 DeepCwind semisubmersible platform is used to design catenary mooring systems for different water depths and turbine spacings. In all cases, the maximum anchor force in the 3-line anchor system is less than or equal to that of the single-line anchor system. Cost models for the mooring lines, anchors, installation and geotechnical site investigation are presented and discussed. In a 100-turbinefarm, the multiline anchor system results in a 9-19% reduction in stationkeeping costs, with high and low estimates for the cost models additionally included. Larger reductions in the combined line and anchor cost result from mooring system configurations with smaller ratios of water depth to turbine spacing. Due to perimeter effects in the multiline configuration, larger cost reductions can be achieved for larger farm sizes.

关键词： Wind energy floating turbines multiline cost analysis

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PARAMETER CALIBRATION FOR CONTINUUM DAMAGE MECHANICS MODELS TO SIMULATE DUCTILE FRACTURE OF HIGH STRENGth PIPELINE STEELS 38

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

作者： Van den Abeele, Filip ArcelorMittal Global R&D Ghent Belgium

ISBN: (纸本)9780791858790

the ability to arrest a running crack is one of the key features in the safe design of pipeline systems. In the industry design codes, the crack arrest properties of a pipeline should meet two requirements: crack propagation has to occur in a ductile fashion, and enough energy should be dissipated during propagation. While the first criterion is assessed by the Battelle Drop Weight Tear Test (BDWTT) at low temperatures, the latter requirement is converted into a lower bound for the impact energy absorbed during a Charpy V-notch (CVN) impact test. However, the introduction of high strength pipelines steels (X70 and beyond) has revealed that the commonly used relations based on BDWTT and CVN no longer hold. For such scenarios, Continuum Damage Mechanics (CDM) models provide promising potential to obtain a more profound understanding of the mechanisms that govern ductile crack propagation in high strength pipeline steels. In recent years, different types of CDM models have been used to simulate ductile fracture of pipeline steels. this paper focuses on two of these models, i.e. the Gurson-Tvergaard-Needleman (GTN) model and the Modified Bai-Wierzbicki (MBW) model. the GTN model is based on the computation of void growth according to Rice and Tracey, and account for the local softening of the material due to void nucleation, growth and subsequent coalescence. the MBW model is a fully coupled damage model, where the yield surface depends on both the stress triaxiality and the Lode angle. Although both models can predict ductile fracture propagation, their widespread application in pipeline design is hampered by the large number of input parameters to be calibrated. the GTN model requires 10 input parameters, i.e. 3 Tvergaard damage parameters, 4 porosity parameters and 3 parameters to describe void nucleation. Whereas the Modified Mohr-Coulomb model originally proposed by Bai and Wierzbicki uses merely 2 parameters, the extended MBW model requires no less than 18 paramet

关键词： Continuum Damage Mechanics Finite Element analysis Parameter Calibration Ductile Fracture Pipeline Steel

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