Comparison of Ice-induced Vibrations on a Conical and a Cylindrical Offshore wind Turbine Substructure

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

In the Gulf of Bothnia, the shallow coastline and the consistent wind conditions provide a good environment for the wind energy production. Relatively thick ice fields and low drifting ice field velocities, up to 0.6 m and 0.15 m/s respectively, are the dominating ice characteristics in the same area. The establishing of an offshore wind turbine in the cold regions requires a careful study on the structural response of ice-induced vibrations. Ice-substructure interaction was studied for a conical and a cylindrical monopile. The dominating ice failure mechanism for the conical substructure is bending. On the other hand, various ice interaction processes occur for the cylindrical substructure, e.g. the lock-in vibration, intermittent crushing and continuous brittle ice crushing. A dynamic ice load for the conical substructure was created with an external algorithm and implemented as a time-dependent loading in the finite element procedure. This ice load model is founded on earlier studies of Kärnä et al. (2004). The cylindrical substructure was analyzed by PSSII a special purpose soil-ice-interaction program developed for a vertical offshore substructure. Ice thickness and velocity were parameterized for both substructures. In addition, various configurations were studied by varying the cone angle and the foundation depth. According to the results, the conical substructure introduces a significant reduction in the vibration amplitudes compared to the cylindrical case. However, when the ice field thickness increases, the vibration amplitudes were observed to increase for the both substructures. The different ice interaction processes, depending on the foundation depth and the ice conditions, e.g. the ice thickness and velocity, are addressed.
Original languageEnglish
Title of host publicationProceedings of 21st IAHR International Symposium on Ice
Subtitle of host publicationIce Research for a Sustainable Environment
EditorsZhijun Li, Peng Lu
Place of PublicationDalian, China
Pages998-1013
Volume2
Publication statusPublished - 2012
MoE publication typeA4 Article in a conference publication
Event21st IAHR International Symposium on Ice - Dalian, China
Duration: 11 Jun 201215 Jun 2012

Conference

Conference21st IAHR International Symposium on Ice
CountryChina
CityDalian
Period11/06/1215/06/12

Fingerprint

wind turbine
vibration
ice
ice field
ice thickness
crushing
comparison
structural response
cold region
failure mechanism

Cite this

Jussila, V., & Heinonen, J. (2012). Comparison of Ice-induced Vibrations on a Conical and a Cylindrical Offshore wind Turbine Substructure. In Z. Li, & P. Lu (Eds.), Proceedings of 21st IAHR International Symposium on Ice : Ice Research for a Sustainable Environment (Vol. 2, pp. 998-1013). Dalian, China.
Jussila, Vilho ; Heinonen, Jaakko. / Comparison of Ice-induced Vibrations on a Conical and a Cylindrical Offshore wind Turbine Substructure. Proceedings of 21st IAHR International Symposium on Ice : Ice Research for a Sustainable Environment. editor / Zhijun Li ; Peng Lu. Vol. 2 Dalian, China, 2012. pp. 998-1013
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title = "Comparison of Ice-induced Vibrations on a Conical and a Cylindrical Offshore wind Turbine Substructure",
abstract = "In the Gulf of Bothnia, the shallow coastline and the consistent wind conditions provide a good environment for the wind energy production. Relatively thick ice fields and low drifting ice field velocities, up to 0.6 m and 0.15 m/s respectively, are the dominating ice characteristics in the same area. The establishing of an offshore wind turbine in the cold regions requires a careful study on the structural response of ice-induced vibrations. Ice-substructure interaction was studied for a conical and a cylindrical monopile. The dominating ice failure mechanism for the conical substructure is bending. On the other hand, various ice interaction processes occur for the cylindrical substructure, e.g. the lock-in vibration, intermittent crushing and continuous brittle ice crushing. A dynamic ice load for the conical substructure was created with an external algorithm and implemented as a time-dependent loading in the finite element procedure. This ice load model is founded on earlier studies of K{\"a}rn{\"a} et al. (2004). The cylindrical substructure was analyzed by PSSII a special purpose soil-ice-interaction program developed for a vertical offshore substructure. Ice thickness and velocity were parameterized for both substructures. In addition, various configurations were studied by varying the cone angle and the foundation depth. According to the results, the conical substructure introduces a significant reduction in the vibration amplitudes compared to the cylindrical case. However, when the ice field thickness increases, the vibration amplitudes were observed to increase for the both substructures. The different ice interaction processes, depending on the foundation depth and the ice conditions, e.g. the ice thickness and velocity, are addressed.",
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Jussila, V & Heinonen, J 2012, Comparison of Ice-induced Vibrations on a Conical and a Cylindrical Offshore wind Turbine Substructure. in Z Li & P Lu (eds), Proceedings of 21st IAHR International Symposium on Ice : Ice Research for a Sustainable Environment. vol. 2, Dalian, China, pp. 998-1013, 21st IAHR International Symposium on Ice, Dalian, China, 11/06/12.

Comparison of Ice-induced Vibrations on a Conical and a Cylindrical Offshore wind Turbine Substructure. / Jussila, Vilho; Heinonen, Jaakko.

Proceedings of 21st IAHR International Symposium on Ice : Ice Research for a Sustainable Environment. ed. / Zhijun Li; Peng Lu. Vol. 2 Dalian, China, 2012. p. 998-1013.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

TY - GEN

T1 - Comparison of Ice-induced Vibrations on a Conical and a Cylindrical Offshore wind Turbine Substructure

AU - Jussila, Vilho

AU - Heinonen, Jaakko

N1 - Project code: 71907

PY - 2012

Y1 - 2012

N2 - In the Gulf of Bothnia, the shallow coastline and the consistent wind conditions provide a good environment for the wind energy production. Relatively thick ice fields and low drifting ice field velocities, up to 0.6 m and 0.15 m/s respectively, are the dominating ice characteristics in the same area. The establishing of an offshore wind turbine in the cold regions requires a careful study on the structural response of ice-induced vibrations. Ice-substructure interaction was studied for a conical and a cylindrical monopile. The dominating ice failure mechanism for the conical substructure is bending. On the other hand, various ice interaction processes occur for the cylindrical substructure, e.g. the lock-in vibration, intermittent crushing and continuous brittle ice crushing. A dynamic ice load for the conical substructure was created with an external algorithm and implemented as a time-dependent loading in the finite element procedure. This ice load model is founded on earlier studies of Kärnä et al. (2004). The cylindrical substructure was analyzed by PSSII a special purpose soil-ice-interaction program developed for a vertical offshore substructure. Ice thickness and velocity were parameterized for both substructures. In addition, various configurations were studied by varying the cone angle and the foundation depth. According to the results, the conical substructure introduces a significant reduction in the vibration amplitudes compared to the cylindrical case. However, when the ice field thickness increases, the vibration amplitudes were observed to increase for the both substructures. The different ice interaction processes, depending on the foundation depth and the ice conditions, e.g. the ice thickness and velocity, are addressed.

AB - In the Gulf of Bothnia, the shallow coastline and the consistent wind conditions provide a good environment for the wind energy production. Relatively thick ice fields and low drifting ice field velocities, up to 0.6 m and 0.15 m/s respectively, are the dominating ice characteristics in the same area. The establishing of an offshore wind turbine in the cold regions requires a careful study on the structural response of ice-induced vibrations. Ice-substructure interaction was studied for a conical and a cylindrical monopile. The dominating ice failure mechanism for the conical substructure is bending. On the other hand, various ice interaction processes occur for the cylindrical substructure, e.g. the lock-in vibration, intermittent crushing and continuous brittle ice crushing. A dynamic ice load for the conical substructure was created with an external algorithm and implemented as a time-dependent loading in the finite element procedure. This ice load model is founded on earlier studies of Kärnä et al. (2004). The cylindrical substructure was analyzed by PSSII a special purpose soil-ice-interaction program developed for a vertical offshore substructure. Ice thickness and velocity were parameterized for both substructures. In addition, various configurations were studied by varying the cone angle and the foundation depth. According to the results, the conical substructure introduces a significant reduction in the vibration amplitudes compared to the cylindrical case. However, when the ice field thickness increases, the vibration amplitudes were observed to increase for the both substructures. The different ice interaction processes, depending on the foundation depth and the ice conditions, e.g. the ice thickness and velocity, are addressed.

UR - http://www.gbv.de/dms/tib-ub-hannover/77920798x.pdf

M3 - Conference article in proceedings

SN - 978-7-8943-7020-4

VL - 2

SP - 998

EP - 1013

BT - Proceedings of 21st IAHR International Symposium on Ice

A2 - Li, Zhijun

A2 - Lu, Peng

CY - Dalian, China

ER -

Jussila V, Heinonen J. Comparison of Ice-induced Vibrations on a Conical and a Cylindrical Offshore wind Turbine Substructure. In Li Z, Lu P, editors, Proceedings of 21st IAHR International Symposium on Ice : Ice Research for a Sustainable Environment. Vol. 2. Dalian, China. 2012. p. 998-1013