Finite Element Modelling and In Situ Modal Testing of an Offshore Wind Turbine
Purpose Generating electricity from wind turbines is currently a viable option to meet the electric power requirements in many countries. The structure of offshore wind turbines is constantly subjected to external dynamic loads due to wind, waves and rotor loads due to the rotation of blades. The fr...
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Published in | Journal of Vibration Engineering & Technologies Vol. 6; no. 2; pp. 101 - 106 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Singapore
Springer Singapore
01.04.2018
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Subjects | |
Online Access | Get full text |
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Abstract | Purpose
Generating electricity from wind turbines is currently a viable option to meet the electric power requirements in many countries. The structure of offshore wind turbines is constantly subjected to external dynamic loads due to wind, waves and rotor loads due to the rotation of blades. The frequency content of these dynamic loads is in the range of natural frequencies of the wind turbine. Therefore, determining the in situ dynamic characteristics of a wind turbine is very beneficial, as it can lead to further improvements in its design, performance and safety.
Methods
In this paper, the dynamics of the structure of an offshore wind turbine is investigated numerically and experimentally. The finite element (FE) model of structural components is developed based on design specifications. The model takes the effect of rotor–nacelle assembly into account by considering its mass and moment of inertias relative to the top centre of the tower. In situ modal tests using impulse excitations were carried out on the actual wind turbine when the rotor blades were not rotating to identify the modal parameters.
Results
This paper presents predicted natural frequencies from the FE model based on design conditions and those identified from the modal and ambient excitation tests.
Conclusion
It was observed that the first two bending modes are close to the natural frequencies identified experimentally by the in situ modal tests. It was also observed that the in situ modal tests were not able to excite other higher natural frequencies of the structure. |
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AbstractList | Purpose
Generating electricity from wind turbines is currently a viable option to meet the electric power requirements in many countries. The structure of offshore wind turbines is constantly subjected to external dynamic loads due to wind, waves and rotor loads due to the rotation of blades. The frequency content of these dynamic loads is in the range of natural frequencies of the wind turbine. Therefore, determining the in situ dynamic characteristics of a wind turbine is very beneficial, as it can lead to further improvements in its design, performance and safety.
Methods
In this paper, the dynamics of the structure of an offshore wind turbine is investigated numerically and experimentally. The finite element (FE) model of structural components is developed based on design specifications. The model takes the effect of rotor–nacelle assembly into account by considering its mass and moment of inertias relative to the top centre of the tower. In situ modal tests using impulse excitations were carried out on the actual wind turbine when the rotor blades were not rotating to identify the modal parameters.
Results
This paper presents predicted natural frequencies from the FE model based on design conditions and those identified from the modal and ambient excitation tests.
Conclusion
It was observed that the first two bending modes are close to the natural frequencies identified experimentally by the in situ modal tests. It was also observed that the in situ modal tests were not able to excite other higher natural frequencies of the structure. |
Author | Andrew, Ian Hahn, Wolfgang Sinha, Jyoti K. Asnaashari, Erfan Morris, Andy |
Author_xml | – sequence: 1 givenname: Erfan surname: Asnaashari fullname: Asnaashari, Erfan email: erfan.asnaashari@manchester.ac.uk organization: School of Mechanical, Aerospace and Civil Engineering, University of Manchester – sequence: 2 givenname: Andy surname: Morris fullname: Morris, Andy organization: EDF Energy – sequence: 3 givenname: Ian surname: Andrew fullname: Andrew, Ian organization: EDF Energy – sequence: 4 givenname: Wolfgang surname: Hahn fullname: Hahn, Wolfgang organization: EDF Energy – sequence: 5 givenname: Jyoti K. surname: Sinha fullname: Sinha, Jyoti K. organization: School of Mechanical, Aerospace and Civil Engineering, University of Manchester |
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CitedBy_id | crossref_primary_10_1007_s42417_022_00832_1 crossref_primary_10_1016_j_oceaneng_2022_111136 crossref_primary_10_1016_j_jsv_2022_117408 crossref_primary_10_1016_j_egyr_2024_03_014 crossref_primary_10_1007_s42417_021_00307_9 crossref_primary_10_3390_en15020579 crossref_primary_10_1016_j_oceaneng_2024_118383 |
Cites_doi | 10.1155/2012/408493 10.1016/j.compgeo.2012.01.010 10.1016/j.apor.2006.03.004 10.1016/j.soildyn.2014.03.006 10.1061/(ASCE)1090-0241(1997)123:11(1010) |
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Keywords | Structural dynamics Finite element modelling Offshore wind turbines In situ modal testing |
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References | Andersen (CR5) 2012; 43 CR2 Zaaijer (CR1) 2006; 28 CR6 CR8 CR7 Bisoi, Haldar (CR3) 2014; 63 Adhikari, Bhattacharya (CR4) 2012; 19 CR9 Lymon (CR10) 1997 18_CR6 LV Andersen (18_CR5) 2012; 43 MB Zaaijer (18_CR1) 2006; 28 18_CR2 S Adhikari (18_CR4) 2012; 19 Swagata Bisoi (18_CR3) 2014; 63 18_CR9 18_CR7 18_CR8 CR Lymon (18_CR10) 1997 |
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Generating electricity from wind turbines is currently a viable option to meet the electric power requirements in many countries. The structure of... |
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Title | Finite Element Modelling and In Situ Modal Testing of an Offshore Wind Turbine |
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