Optimization of Mooring Line Axial Stiness Characteristics for Oshore Renewable Energy Applications

Ajit C. Pillai; Philipp R. Thies; Lars Johanning

Optimization of Mooring Line Axial Stiness Characteristics for Oshore Renewable Energy Applications

Ajit C. Pillai
, Philipp R. Thies
, Lars Johanning

School of Engineering, Computing and Mathematics

University of Exeter

Research output: Chapter in Book/Report/Conference proceeding › Conference proceedings published in a book › peer-review

Abstract

Expanding on existing methodologies for the design optimization of mooring systems for offshore renewable energy devices, this paper explores the optimization of the axial stiffness of a mooring system, a key property that governs the motion of the moored renewable energy device. The optimization using a covariance matrix adaptation evolutionary strategy is executed with respect to both the motion response of the moored device, and the cumulative fatigue damage in the mooring lines. Previous mooring system optimization work has focused on geometry optimization of the system considering known material properties, whilst this paper explores the optimization of the axial stiffness properties of the mooring system identifying ways in which the response of the system can be optimized through changes in the material properties. Considering the case of a moored heaving buoy similar to an offshore renewable energy device, the present case study optimizes the mooring system simultaneously minimizing the cumulative fatigue damage in the mooring lines while also maximizing the heave response which is responsible for the energy generated by the device.

Original language	English
Title of host publication	Proceedings of the 28th International Ocean and Polar Engineering Conference, ISOPE 2018
Publisher	International Society of Offshore and Polar Engineers
Pages	690-697
Number of pages	8
ISBN (Print)	9781880653876
Publication status	Published - 2018
Event	28th International Ocean and Polar Engineering Conference, ISOPE 2018 - Sapporo, Japan Duration: 10 Jun 2018 → 15 Jun 2018

Publication series

Name	Proceedings of the International Offshore and Polar Engineering Conference
Volume	2018-June
ISSN (Print)	1098-6189
ISSN (Electronic)	1555-1792

Conference

Conference	28th International Ocean and Polar Engineering Conference, ISOPE 2018
Country/Territory	Japan
City	Sapporo
Period	10/06/18 → 15/06/18

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

ASJC Scopus subject areas

Energy Engineering and Power Technology
Ocean Engineering
Mechanical Engineering

Keywords

Covariance matrix adaptation
Mooring design
Multi-objective evolutionary strategy
Offshore renewable energy
Reliability-based design optimization

Cite this

Pillai, A. C., Thies, P. R., & Johanning, L. (2018). Optimization of Mooring Line Axial Stiness Characteristics for Oshore Renewable Energy Applications. In Proceedings of the 28th International Ocean and Polar Engineering Conference, ISOPE 2018 (pp. 690-697). (Proceedings of the International Offshore and Polar Engineering Conference; Vol. 2018-June). International Society of Offshore and Polar Engineers.

Pillai, Ajit C. ; Thies, Philipp R. ; Johanning, Lars. / Optimization of Mooring Line Axial Stiness Characteristics for Oshore Renewable Energy Applications. Proceedings of the 28th International Ocean and Polar Engineering Conference, ISOPE 2018. International Society of Offshore and Polar Engineers, 2018. pp. 690-697 (Proceedings of the International Offshore and Polar Engineering Conference).

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title = "Optimization of Mooring Line Axial Stiness Characteristics for Oshore Renewable Energy Applications",

abstract = "Expanding on existing methodologies for the design optimization of mooring systems for offshore renewable energy devices, this paper explores the optimization of the axial stiffness of a mooring system, a key property that governs the motion of the moored renewable energy device. The optimization using a covariance matrix adaptation evolutionary strategy is executed with respect to both the motion response of the moored device, and the cumulative fatigue damage in the mooring lines. Previous mooring system optimization work has focused on geometry optimization of the system considering known material properties, whilst this paper explores the optimization of the axial stiffness properties of the mooring system identifying ways in which the response of the system can be optimized through changes in the material properties. Considering the case of a moored heaving buoy similar to an offshore renewable energy device, the present case study optimizes the mooring system simultaneously minimizing the cumulative fatigue damage in the mooring lines while also maximizing the heave response which is responsible for the energy generated by the device.",

keywords = "Covariance matrix adaptation, Mooring design, Multi-objective evolutionary strategy, Offshore renewable energy, Reliability-based design optimization",

author = "Pillai, \{Ajit C.\} and Thies, \{Philipp R.\} and Lars Johanning",

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year = "2018",

language = "English",

isbn = "9781880653876",

series = "Proceedings of the International Offshore and Polar Engineering Conference",

publisher = "International Society of Offshore and Polar Engineers",

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Pillai, AC, Thies, PR & Johanning, L 2018, Optimization of Mooring Line Axial Stiness Characteristics for Oshore Renewable Energy Applications. in Proceedings of the 28th International Ocean and Polar Engineering Conference, ISOPE 2018. Proceedings of the International Offshore and Polar Engineering Conference, vol. 2018-June, International Society of Offshore and Polar Engineers, pp. 690-697, 28th International Ocean and Polar Engineering Conference, ISOPE 2018, Sapporo, Japan, 10/06/18.

Optimization of Mooring Line Axial Stiness Characteristics for Oshore Renewable Energy Applications. / Pillai, Ajit C.; Thies, Philipp R.; Johanning, Lars.
Proceedings of the 28th International Ocean and Polar Engineering Conference, ISOPE 2018. International Society of Offshore and Polar Engineers, 2018. p. 690-697 (Proceedings of the International Offshore and Polar Engineering Conference; Vol. 2018-June).

Research output: Chapter in Book/Report/Conference proceeding › Conference proceedings published in a book › peer-review

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T1 - Optimization of Mooring Line Axial Stiness Characteristics for Oshore Renewable Energy Applications

AU - Pillai, Ajit C.

AU - Thies, Philipp R.

AU - Johanning, Lars

PY - 2018

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N2 - Expanding on existing methodologies for the design optimization of mooring systems for offshore renewable energy devices, this paper explores the optimization of the axial stiffness of a mooring system, a key property that governs the motion of the moored renewable energy device. The optimization using a covariance matrix adaptation evolutionary strategy is executed with respect to both the motion response of the moored device, and the cumulative fatigue damage in the mooring lines. Previous mooring system optimization work has focused on geometry optimization of the system considering known material properties, whilst this paper explores the optimization of the axial stiffness properties of the mooring system identifying ways in which the response of the system can be optimized through changes in the material properties. Considering the case of a moored heaving buoy similar to an offshore renewable energy device, the present case study optimizes the mooring system simultaneously minimizing the cumulative fatigue damage in the mooring lines while also maximizing the heave response which is responsible for the energy generated by the device.

AB - Expanding on existing methodologies for the design optimization of mooring systems for offshore renewable energy devices, this paper explores the optimization of the axial stiffness of a mooring system, a key property that governs the motion of the moored renewable energy device. The optimization using a covariance matrix adaptation evolutionary strategy is executed with respect to both the motion response of the moored device, and the cumulative fatigue damage in the mooring lines. Previous mooring system optimization work has focused on geometry optimization of the system considering known material properties, whilst this paper explores the optimization of the axial stiffness properties of the mooring system identifying ways in which the response of the system can be optimized through changes in the material properties. Considering the case of a moored heaving buoy similar to an offshore renewable energy device, the present case study optimizes the mooring system simultaneously minimizing the cumulative fatigue damage in the mooring lines while also maximizing the heave response which is responsible for the energy generated by the device.

KW - Covariance matrix adaptation

KW - Mooring design

KW - Multi-objective evolutionary strategy

KW - Offshore renewable energy

KW - Reliability-based design optimization

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T3 - Proceedings of the International Offshore and Polar Engineering Conference

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Pillai AC, Thies PR, Johanning L. Optimization of Mooring Line Axial Stiness Characteristics for Oshore Renewable Energy Applications. In Proceedings of the 28th International Ocean and Polar Engineering Conference, ISOPE 2018. International Society of Offshore and Polar Engineers. 2018. p. 690-697. (Proceedings of the International Offshore and Polar Engineering Conference).

Optimization of Mooring Line Axial Stiness Characteristics for Oshore Renewable Energy Applications

Abstract

Publication series

Conference

UN SDGs

ASJC Scopus subject areas

Keywords

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