Applicability of offshore mooring and foundation technologies for Marine Renewable Energy (MRE) device arrays

Karimirad, Madjid; Koushan, Kourosh; Weller, Sam; Hardwick, Jon; Johanning, Lars

doi:10.1201/b18973-127

Cited by 6 publications

(8 citation statements)

References 7 publications

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“…On the other hand, the restoring capabilities of taut lines, usually composed of either steel wire or synthetic ropes, are based on the axial stiffness of the lines and need to be pre-tensioned before their operation. Taut mooring systems, although having the advantage of a small footprint, determine a high stiffness that is likely to affect negatively the motion of wave energy devices [20,21]. Furthermore, they require very expensive foundations, as vertically loaded piled anchors [22].…”

Section: Mooring Solutions For Floating Wecsmentioning

confidence: 99%

Experimental Investigation of the Mooring System of a Wave Energy Converter in Operating and Extreme Wave Conditions

Sirigu

Bonfanti

Begović

et al. 2020

JMSE

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A proper design of the mooring systems for Wave Energy Converters (WECs) requires an accurate investigation of both operating and extreme wave conditions. A careful analysis of these systems is required to design a mooring configuration that ensures station keeping, reliability, maintainability, and low costs, without affecting the WEC dynamics. In this context, an experimental campaign on a 1:20 scaled prototype of the ISWEC (Inertial Sea Wave Energy Converter), focusing on the influence of the mooring layout on loads in extreme wave conditions, is presented and discussed. Two mooring configurations composed of multiple slack catenaries with sub-surface buoys, with or without clump-weights, have been designed and investigated experimentally. Tests in regular, irregular, and extreme waves for a moored model of the ISWEC device have been performed at the University of Naples Federico II. The aim is to identify a mooring solution that could guarantee both correct operation of the device and load carrying in extreme sea conditions. Pitch motion and loads in the rotational joint have been considered as indicators of the device hydrodynamic behavior and mooring configuration impact on the WEC.

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Section: Mooring Solutions For Floating Wecsmentioning

confidence: 99%

Experimental Investigation of the Mooring System of a Wave Energy Converter in Operating and Extreme Wave Conditions

Sirigu

Bonfanti

Begović

et al. 2020

JMSE

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“…The characteristics of the energy conversion devices themselves also dictate the location where deployment should take place. For example, marine renewable energy devices are either floating, bottom fixed or onshore fixed platforms [1]- [3]. Regarding the type of foundation to be utilized, the most common are the monopole, gravity foundation, tripod foundation, and jacket foundation [4], [5].…”

Section: Introductionmentioning

confidence: 99%

An Alternative Technique for Ultra-high Resolution Bathymetry and Seabed Inspection for Marine Renewables

Francisco¹,

Sundberg²

2020

Preprint

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Marine renewable energy technologies have a great potential in supplying clean electricity to millions of people across the globe, if technical and economic conditions are in right. So far, ocean energy projects are commonly started by SMEs or educational institutions with limited budgets. Therefore, any effort to reduce expenses is of great value. One of the areas involving substantial expenses are the inevitable seabed inspection prior to deployment of marine renewable energy device. Detailed seabed inspections can also reduce the risk of associated with deployment of structures on uneven seabed, especially marine renewable energy devices with gravity foundations. By reducing the costs and risks of such surveys prior and during the installation phases, the feasibility of marine renewable energy projects can be more favoured and competitive. In this perspective, this study proposes a cost and time effective technique for seabed surveys. The proposed technique involves the use of high precision and inexpensive sonar systems and underwater optical cameras integrated into a versatile and compact subsea monitoring platform. It also involves simple and practical data acquisition and processing protocols that do not requires hi expertise for operation. The results obtained showed that high resolution bathymetric maps and detailed seabed inspections imagery can be acquired. This study concludes that a simple and inexpensive subsea monitoring platform comprising a multibeam, dual beam and video cameras can be effective for high resolution seabed inspection and bathymetric measurements for marine energy applications.

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“…Karimirad et al [25] detail the applicability of different offshore mooring and foundation technologies for WECs. A comparison of station-keeping design for WECs compared to offshore oil and gas platforms is performed by Paredes et al [28], which concludes that a deeper analysis of mooring systems for WECs is required, compared to what is demanded for offshore oil and gas platforms, in order to properly assess the effect on the PTO, and survivability.…”

Section: Comparison With Moorings In Other Offshore Engineering Fieldsmentioning

confidence: 99%

“…For some classes of directional floating WECs, such as terminator or attenuator devices, the mooring system must allow the WEC to weathervane into the predominant wave direction, while for axisymmetric point absorber type WECs the wave directionality is not important. Mooring systems have been classified into three categories, depending on their relevance to the WEC operation [15,[23][24][25]; passive, active and reactive:…”

Section: Mooring Systems In Wave Energy Conversionmentioning

confidence: 99%

“…Figure 1 depicts that a mooring system consists of different components and materials, arranged in a certain configuration. A good review of the different mooring system types and classifications is given by Harnois [35], and the different components and configurations are reviewed by Karimirad et al [25]. The report in [26] establishes an industry knowledge base for existing anchoring and mooring techniques as applied to WECs and provides practical guidance on anchors and mooring techniques and sources of reliable design information necessary to the design of WECs.…”

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confidence: 99%

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Mathematical Modelling of Mooring Systems for Wave Energy Converters—A Review

2017

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Mathematical analysis is an essential tool for the successful development and operation of wave energy converters (WECs). Mathematical models of moorings systems are therefore a requisite in the overall techno-economic design and operation of floating WECs. Mooring models (MMs) can be applied to a range of areas, such as WEC simulation, performance evaluation and optimisation, control design and implementation, extreme load calculation, mooring line fatigue life evaluation, mooring design, and array layout optimisation. The mathematical modelling of mooring systems is a venture from physics to numerics, and as such, there are a broad range of details to consider when applying MMs to WEC analysis. A large body of work exists on MMs, developed within other related ocean engineering fields, due to the common requirement of mooring floating bodies, such as vessels and offshore oil and gas platforms. This paper reviews the mathematical modelling of the mooring systems for WECs, detailing the relevant material developed in other offshore industries and presenting the published usage of MMs for WEC analysis.

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Applicability of offshore mooring and foundation technologies for Marine Renewable Energy (MRE) device arrays

Cited by 6 publications

References 7 publications

Experimental Investigation of the Mooring System of a Wave Energy Converter in Operating and Extreme Wave Conditions

Experimental Investigation of the Mooring System of a Wave Energy Converter in Operating and Extreme Wave Conditions

An Alternative Technique for Ultra-high Resolution Bathymetry and Seabed Inspection for Marine Renewables

Mathematical Modelling of Mooring Systems for Wave Energy Converters—A Review

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