Comparison of Foundation Systems for Wave Energy Converters Wavestar

Evelina Vaitkunaite, Lars Bo Ibsen, Benjaminn Nordahl Nielsen, Salvador Devant Molina

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Abstract

In order to deliver cost competitive solutions, Wave Energy Converters (WEC) must be optimized in several fields, e.g. transportation, installation, structure, machinery etc. Large expenses lie on the superstructure support, i.e. the offshore foundation. Geotechnical analysis and optimization of six possible foundation solutions for WEC are presented in this article. The study is performed for WEC superstructure supported by two or four foundations. In the four-column system horizontal wind and wave loads are transformed as a pair of vertical forces, acting in tension and compression. When the overturning moment is large, it might be desirable to increase the width distance, achieving smaller vertical forces. For this reason, several distances between the supporting columns are investigated. Additionally, a two-column system is analysed as it is expected to be more cost effective. In such a solution horizontal wind and wave loads are dominant.

Gravity based, pile and bucket foundations are universally applied solutions for the offshore structures. The suitability of these types for a WEC is analysed and commented. The foundations are designed to satisfy ultimate and serviceability limit state requirements. For each of the foundation solutions, three geotechnical design steps are followed, employing analytical calculations, numerical 2D and 3D finite element programs.
Original languageEnglish
Title of host publication10th ewtec 2013 European Wave and Tidal Energy Conference Series : Proceedings of the 10th European Wave and Tidal Energy Conference
EditorsPeter Frigaard, Jens Peter Kofoed, AbuBakr S. Bahaj, Lars Bergdahl, Alain Clément, Daniel Conley, Antonio F. O. Falcão, Cameron MacLeod Johnstone, Lucia Margheritini, Ian Masters, António José Sarmento, Diego Vicinanza
Number of pages9
Place of PublicationAalborg
PublisherTechnical Committee of the European Wave and Tidal Energy Conference
Publication date2013
Publication statusPublished - 2013
EventEuropean Wave and Tidal Energy Conference - Aalborg, Denmark
Duration: 2 Sep 20135 Sep 2013
Conference number: 10

Conference

ConferenceEuropean Wave and Tidal Energy Conference
Number10
CountryDenmark
CityAalborg
Period02/09/201305/09/2013
SeriesEuropean Wave and Tidal Energy Conference Series
Number10

Fingerprint

Offshore structures
Piles
Machinery
Costs
Gravitation

Bibliographical note

The proceedings is published on a usb.

Keywords

  • Bucket
  • Pile
  • Gravity based foundation
  • Geotechnical design
  • Wave energy converter
  • Wavestar

Cite this

Vaitkunaite, E., Ibsen, L. B., Nielsen, B. N., & Devant Molina, S. (2013). Comparison of Foundation Systems for Wave Energy Converters Wavestar. In P. Frigaard, J. P. Kofoed, A. S. Bahaj, L. Bergdahl, A. Clément, D. Conley, A. F. O. Falcão, C. M. Johnstone, L. Margheritini, I. Masters, A. J. Sarmento, ... D. Vicinanza (Eds.), 10th ewtec 2013 European Wave and Tidal Energy Conference Series: Proceedings of the 10th European Wave and Tidal Energy Conference Aalborg: Technical Committee of the European Wave and Tidal Energy Conference. European Wave and Tidal Energy Conference Series, No. 10
Vaitkunaite, Evelina ; Ibsen, Lars Bo ; Nielsen, Benjaminn Nordahl ; Devant Molina, Salvador. / Comparison of Foundation Systems for Wave Energy Converters Wavestar. 10th ewtec 2013 European Wave and Tidal Energy Conference Series: Proceedings of the 10th European Wave and Tidal Energy Conference. editor / Peter Frigaard ; Jens Peter Kofoed ; AbuBakr S. Bahaj ; Lars Bergdahl ; Alain Clément ; Daniel Conley ; Antonio F. O. Falcão ; Cameron MacLeod Johnstone ; Lucia Margheritini ; Ian Masters ; António José Sarmento ; Diego Vicinanza. Aalborg : Technical Committee of the European Wave and Tidal Energy Conference, 2013. (European Wave and Tidal Energy Conference Series; No. 10).
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abstract = "In order to deliver cost competitive solutions, Wave Energy Converters (WEC) must be optimized in several fields, e.g. transportation, installation, structure, machinery etc. Large expenses lie on the superstructure support, i.e. the offshore foundation. Geotechnical analysis and optimization of six possible foundation solutions for WEC are presented in this article. The study is performed for WEC superstructure supported by two or four foundations. In the four-column system horizontal wind and wave loads are transformed as a pair of vertical forces, acting in tension and compression. When the overturning moment is large, it might be desirable to increase the width distance, achieving smaller vertical forces. For this reason, several distances between the supporting columns are investigated. Additionally, a two-column system is analysed as it is expected to be more cost effective. In such a solution horizontal wind and wave loads are dominant.Gravity based, pile and bucket foundations are universally applied solutions for the offshore structures. The suitability of these types for a WEC is analysed and commented. The foundations are designed to satisfy ultimate and serviceability limit state requirements. For each of the foundation solutions, three geotechnical design steps are followed, employing analytical calculations, numerical 2D and 3D finite element programs.",
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Vaitkunaite, E, Ibsen, LB, Nielsen, BN & Devant Molina, S 2013, Comparison of Foundation Systems for Wave Energy Converters Wavestar. in P Frigaard, JP Kofoed, AS Bahaj, L Bergdahl, A Clément, D Conley, AFO Falcão, CM Johnstone, L Margheritini, I Masters, AJ Sarmento & D Vicinanza (eds), 10th ewtec 2013 European Wave and Tidal Energy Conference Series: Proceedings of the 10th European Wave and Tidal Energy Conference. Technical Committee of the European Wave and Tidal Energy Conference, Aalborg, European Wave and Tidal Energy Conference Series, no. 10, European Wave and Tidal Energy Conference, Aalborg, Denmark, 02/09/2013.

Comparison of Foundation Systems for Wave Energy Converters Wavestar. / Vaitkunaite, Evelina; Ibsen, Lars Bo; Nielsen, Benjaminn Nordahl; Devant Molina, Salvador.

10th ewtec 2013 European Wave and Tidal Energy Conference Series: Proceedings of the 10th European Wave and Tidal Energy Conference. ed. / Peter Frigaard; Jens Peter Kofoed; AbuBakr S. Bahaj; Lars Bergdahl; Alain Clément; Daniel Conley; Antonio F. O. Falcão; Cameron MacLeod Johnstone; Lucia Margheritini; Ian Masters; António José Sarmento; Diego Vicinanza. Aalborg : Technical Committee of the European Wave and Tidal Energy Conference, 2013. (European Wave and Tidal Energy Conference Series; No. 10).

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

TY - GEN

T1 - Comparison of Foundation Systems for Wave Energy Converters Wavestar

AU - Vaitkunaite, Evelina

AU - Ibsen, Lars Bo

AU - Nielsen, Benjaminn Nordahl

AU - Devant Molina, Salvador

N1 - The proceedings is published on a usb.

PY - 2013

Y1 - 2013

N2 - In order to deliver cost competitive solutions, Wave Energy Converters (WEC) must be optimized in several fields, e.g. transportation, installation, structure, machinery etc. Large expenses lie on the superstructure support, i.e. the offshore foundation. Geotechnical analysis and optimization of six possible foundation solutions for WEC are presented in this article. The study is performed for WEC superstructure supported by two or four foundations. In the four-column system horizontal wind and wave loads are transformed as a pair of vertical forces, acting in tension and compression. When the overturning moment is large, it might be desirable to increase the width distance, achieving smaller vertical forces. For this reason, several distances between the supporting columns are investigated. Additionally, a two-column system is analysed as it is expected to be more cost effective. In such a solution horizontal wind and wave loads are dominant.Gravity based, pile and bucket foundations are universally applied solutions for the offshore structures. The suitability of these types for a WEC is analysed and commented. The foundations are designed to satisfy ultimate and serviceability limit state requirements. For each of the foundation solutions, three geotechnical design steps are followed, employing analytical calculations, numerical 2D and 3D finite element programs.

AB - In order to deliver cost competitive solutions, Wave Energy Converters (WEC) must be optimized in several fields, e.g. transportation, installation, structure, machinery etc. Large expenses lie on the superstructure support, i.e. the offshore foundation. Geotechnical analysis and optimization of six possible foundation solutions for WEC are presented in this article. The study is performed for WEC superstructure supported by two or four foundations. In the four-column system horizontal wind and wave loads are transformed as a pair of vertical forces, acting in tension and compression. When the overturning moment is large, it might be desirable to increase the width distance, achieving smaller vertical forces. For this reason, several distances between the supporting columns are investigated. Additionally, a two-column system is analysed as it is expected to be more cost effective. In such a solution horizontal wind and wave loads are dominant.Gravity based, pile and bucket foundations are universally applied solutions for the offshore structures. The suitability of these types for a WEC is analysed and commented. The foundations are designed to satisfy ultimate and serviceability limit state requirements. For each of the foundation solutions, three geotechnical design steps are followed, employing analytical calculations, numerical 2D and 3D finite element programs.

KW - Bucket

KW - Pile

KW - Gravity based foundation

KW - Geotechnical design

KW - Wave energy converter

KW - Wavestar

KW - Bucket

KW - Pile

KW - Gravity based foundation

KW - Geotechnical design

KW - Wave energy converter

KW - Wavestar

M3 - Article in proceeding

T3 - European Wave and Tidal Energy Conference Series

BT - 10th ewtec 2013 European Wave and Tidal Energy Conference Series

A2 - Frigaard, Peter

A2 - Kofoed, Jens Peter

A2 - Bahaj, AbuBakr S.

A2 - Bergdahl, Lars

A2 - Clément, Alain

A2 - Conley, Daniel

A2 - Falcão, Antonio F. O.

A2 - Johnstone, Cameron MacLeod

A2 - Margheritini, Lucia

A2 - Masters, Ian

A2 - Sarmento, António José

A2 - Vicinanza, Diego

PB - Technical Committee of the European Wave and Tidal Energy Conference

CY - Aalborg

ER -

Vaitkunaite E, Ibsen LB, Nielsen BN, Devant Molina S. Comparison of Foundation Systems for Wave Energy Converters Wavestar. In Frigaard P, Kofoed JP, Bahaj AS, Bergdahl L, Clément A, Conley D, Falcão AFO, Johnstone CM, Margheritini L, Masters I, Sarmento AJ, Vicinanza D, editors, 10th ewtec 2013 European Wave and Tidal Energy Conference Series: Proceedings of the 10th European Wave and Tidal Energy Conference. Aalborg: Technical Committee of the European Wave and Tidal Energy Conference. 2013. (European Wave and Tidal Energy Conference Series; No. 10).