Next Article in Journal
Towards a New Generation of Building Envelope Calibration
Previous Article in Journal
Analyses of Wind and Photovoltaic Energy Integration from the Promoting Scheme Point of View: Study Case of Romania
Article Menu
Issue 12 (December) cover image

Export Article

Open AccessArticle
Energies 2017, 10(12), 2097; doi:10.3390/en10122097

Directionality Effects of Aligned Wind and Wave Loads on a Y-Shape Semi-Submersible Floating Wind Turbine under Rated Operational Conditions

1
Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China
2
School of Civil Engineering, Harbin Institute of Technology, Harbin 150001, China
3
Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China
4
XEMC Windpower Co., Ltd., Xiangtan 411102, China
*
Author to whom correspondence should be addressed.
Received: 28 October 2017 / Revised: 5 December 2017 / Accepted: 6 December 2017 / Published: 11 December 2017
(This article belongs to the Section Energy Fundamentals and Conversion)

Abstract

The Y-shape (triangular) semi-submersible foundation has been adopted by most of the built full-scale floating wind turbines, such as Windfloat, Fukushima Mirai and Shimpuu. Considering the non-fully-symmetrical shape and met-ocean condition, the foundation laying angle relative to wind/wave directions will not only influence the downtime and power efficiency of the floating turbine, but also the strength and fatigue safety of the whole structure. However, the dynamic responses induced by various aligned wind and wave load directions have scarcely been investigated comparatively before. In our study, the directionality effects are investigated by means of combined wind and wave tests and coupled multi-body simulations. By comparing the measured data in three load directions, it is found that the differences of platform motions are mainly derived from the wave loads and larger pitch motion can always be observed in one of the directions. To make certain the mechanism underlying the observed phenomena, a coupled multi-body dynamic model of the floating wind turbine is established and validated. The numerical results demonstrate that the second-order hydrodynamic forces contribute greatly to the directionality distinctions for surge and pitch, and the first-order hydrodynamic forces determine the variations of tower base bending moments and nacelle accelerations. These findings indicate the directionality effects should be predetermined comprehensively before installation at sea, which is important for the operation and maintenance of the Y-shape floating wind turbines. View Full-Text
Keywords: Y-shape semi-submersible foundation; aligned wind and wave load directions; directionality effects; combined wind and wave tests; coupled multi-body simulations Y-shape semi-submersible foundation; aligned wind and wave load directions; directionality effects; combined wind and wave tests; coupled multi-body simulations
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Zhou, S.; Shan, B.; Xiao, Y.; Li, C.; Hu, G.; Song, X.; Liu, Y.; Hu, Y. Directionality Effects of Aligned Wind and Wave Loads on a Y-Shape Semi-Submersible Floating Wind Turbine under Rated Operational Conditions. Energies 2017, 10, 2097.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Energies EISSN 1996-1073 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top