The Experts below are selected from a list of 2436 Experts worldwide ranked by ideXlab platform

Cesar Vidal - One of the best experts on this subject based on the ideXlab platform.

  • new extreme model applied to Mooring System Design load case assessment
    ASME 2015 34th International Conference on Ocean Offshore and Arctic Engineering, 2015
    Co-Authors: Fernando Del Jesus, Raul Guanche, Inigo J Losada, Cesar Vidal
    Abstract:

    Offshore wind energy turbines are being deployed massively in the North Sea. Most of the latest developments are monopile based due to the local bathymetry. However, future offshore wind farms will be located at larger water depths. Mainly because the nearest sites to the shoreline will be already occupied, future wind farms will be in 60 m water depth at least. This is, approximately, the limit for fixed support structures, such as monopiles, tripods and jackets. Some developers have already identified this need and some prototypes are under testing, such as WindFloat and Hywind.Floating wind technology will face some challenges. One of the most important ones is how to moderate the cost of the platform and the Mooring System. Consequently, it is necessary to reduce the uncertainty during Design steps.In this paper, new extreme mixed model will be applied to Mooring System Design. This extreme model combines instrumental and reanalysis data in order to obtain more accurate Design parameters, reducing the uncertainty and improving the input that is required for the structural Design of these concepts.Copyright © 2015 by ASME

Myung-soo Choi - One of the best experts on this subject based on the ideXlab platform.

  • A Study on Position Mooring System Design for the Vessel Moored by Mooring Lines
    IEEE ASME Transactions on Mechatronics, 2015
    Co-Authors: Sang-won Ji, Myung-soo Choi
    Abstract:

    This paper presents the experimental results about position Mooring (PM) System applied to the barge ship. The aim of the PM is to maintain the position and motion of the ship's surge and sway directions as desired. In this paper, a System consisting of a barge vessel and Mooring lines is mathematically modeled. The position and orientation of the vessel is controlled by changing the tensions of the Mooring lines with the subwinch. A comparison of the newly Designed mathematical model with the existing PID control method and the results of experiments indicated that the proposed Designing method is more efficient than the traditional method.

Chan Chow Megan - One of the best experts on this subject based on the ideXlab platform.

  • Mooring System Design for Wind Farm In Very Deep Water: European Wind Energy Master Thesis
    2019
    Co-Authors: Chan Chow Megan
    Abstract:

    Offshore floating wind turbines are one of the newest technologies in the renewable markets today. The world’s first floating wind farm, the Hywind Scotland Pilot Park, was commissioned in October 2017 and has been competitive with fixed bottom offshore wind turbines. There is a global push to make more renewable energy available, but less desire to have wind turbines cluttering the coastline. Floating wind turbines enable the developer to take advantage of unused offshore space, at depths where traditional fixed bottom structures are impractical and at locations that do not spoil the vista of the coastline. This thesis project aims to develop a working Mooring System at depth of 600 m in the Norwegian North Sea, and then investigates the possibility of shared anchors in a wind park with this Mooring System. The DTU 10MW reference wind turbine atop a classic spar substructure is used. First, the Mooring System at 320 m is tested under decay and environmental loads. Then a chain-polyester-chain Mooring line with a bridle was developed for 600 m so that the surge offset is limited to <60 m for 3 load cases. A simplified model of the wind turbine was then developed for these three load cases. The simplified model was then used to create a wind farm arrangement with 5-6 turbines each. Each wind farm varied in layout and in the number of shared anchors. It was found that while the Mooring System Designed passes the surge offset and natural frequency requirements, and the normal ULS safety class, it failed the high safety class in some cases. For shared anchors with multidirectional loads, the resultant force on the anchor is significantly less as long as the lines are distributed equally around the anchor point. The resultant force does not increase with two lines 120± apart. The footprint of a single turbine with the Designed Mooring is larger than the footprint of the entire Hywind Scotland Farm, so suggestions are made for improvement and further work.European Wind Energy Masters (EWEM) | Offshore and dredging engineering | Bottom Founded Structures, Arctic and Win

Michael Muskulus - One of the best experts on this subject based on the ideXlab platform.

  • Mooring System optimization for floating wind turbines using frequency domain analysis
    Energy Procedia, 2012
    Co-Authors: Matthias Brommundt, Ludwig Krause, Karl O Merz, Michael Muskulus
    Abstract:

    Abstract This paper describes a new tool for the optimization of catenary Mooring Systems for floating wind turbines with a semi-submersible support structure. Each source of environmental loading -wind, current and waves -is spread over a range of compass directions, based upon probability distributions determined by meteorological and oceanographic measurements. Frequency domain analysis is applied to determine the linear response of the platform. Mean forces due to wind and current are determined to find the mean position of the platform and thereby the linearized Mooring stiffness matrix. Subsequently, the stochastic loads from wind sea, ocean swell and turbulent wind are applied in the form of spectral loading matrices. The resulting Mooring System Design is site-specific, accounting for the directionality of environmental loads. A large number of different scenarios can be evaluated quickly and approximately. Hence the tool is useful for preliminary Design of floating wind turbines.As an example application, a symmetric semi-submersible Design with three columns is analyzed. Results for two sites in the North Sea, with different water depths and distinct directionality of environmental loads, are compared and indicate that spectral wind loads should be considered when Designing Mooring Systems for floating wind turbines.

Chan Chow, Megan Nissa - One of the best experts on this subject based on the ideXlab platform.

  • Mooring System Design for a floating wind farm in very deep water - European Wind Energy Master Thesis
    NTNU, 2019
    Co-Authors: Chan Chow, Megan Nissa
    Abstract:

    Offshore floating wind turbines are one of the newest technologies in the renewable markets today. The world s first floating wind farm, the Hywind Scotland Pilot Park, was commissioned in October 2017 and has been competitive with fixed bottom offshore wind turbines. There is a global push to make more renewable energy available, but less desire to have wind turbines cluttering the coastline. Floating wind turbines enable the developer to take advantage of unused offshore space, at depths where traditional fixed bottom structures are impractical and at locations that do not spoil the vista of the coastline. This thesis project aims to develop a working Mooring System at depth of 600 m in the Norwegian North Sea, and then investigates the possibility of shared anchors in a wind park with this Mooring System. The DTU 10MW reference wind turbine atop a classic spar substructure is used. First, the Mooring System at 320 m is tested under decay and environmental loads. Then a chain-polyester-chain Mooring line with a bridle was developed for 600 m so that the surge offset is limited to