scholarly journals Dynamic effects in the response of offshore wind turbines supported by jackets under wave loading

2017 ◽  
Vol 142 ◽  
pp. 36-45 ◽  
Author(s):  
Kai Wei ◽  
Andrew T. Myers ◽  
Sanjay R. Arwade
Keyword(s):  
Wind Turbines ◽  
Offshore Wind ◽  
Wave Loading ◽  
Dynamic Effects ◽  
Offshore Wind Turbines

Consistent Modal Calibration of a Pendulum-Type Vibration Absorber

2022 ◽  
Author(s):  
J. Høgsberg
Keyword(s):  
Wind Turbines ◽  
Offshore Wind ◽  
Vibration Absorber ◽  
Wave Loading ◽  
Offshore Wind Turbines ◽  
Stiffness And Damping

Abstract. Pendulum absorbers are installation in offshore wind turbines to mitigate excessive vibration amplitudes from wind and wave loading. The pendulum damper is placed inside the tower and attached to the structure at two distinct points: The tower top, where the pendulum arm is fixated, and at the position of the pendulum mass, which is connected to the tower wall by the damper. The present paper derives a modal calibration principle, which consistently accounts for different points of attachment for the absorber stiffness and damping.

Efficient Multiline Anchor Systems for Floating Offshore Wind Turbines

2016 ◽  
Author(s):  
Casey M. Fontana ◽  
Sanjay R. Arwade ◽  
Don J. DeGroot ◽  
Andrew T. Myers ◽  
Melissa Landon ◽  
...  
Keyword(s):  
Dynamic Simulation ◽  
Wind Turbines ◽  
Wind Farm ◽  
Offshore Wind ◽  
Wave Loading ◽  
Peak Demand ◽  
Offshore Wind Turbines ◽  
Floating Offshore Wind Turbines ◽  
Anchor Systems ◽  
Floating Platforms

A mooring and anchoring concept for floating offshore wind turbines is introduced in which each anchor moors multiple floating platforms. Several possible geometries are identified and it is shown that the number of anchors for a wind farm can be reduced by factors of at least 3. Dynamic simulation of turbine dynamics for one of the candidate geometries and for two directions of wind and wave loading allows estimation of multiline anchor forces the preview the types of loads that a multiline anchor will need to resist. Preliminary findings indicate that the peak demand on the anchor may be reduced by as much as 30% but that anchors used in such a system will need to be able to resist multi-directional loading.

scholarly journals WAVE LOADS AND STABILITY OF NEW FOUNDATION STRUCTURE FOR OFFSHORE WIND TURBINES MADE OF OCEAN BRICK SYSTEM (OBS)

2011 ◽  
Vol 1 (32) ◽  
pp. 66
Author(s):  
Saskia Pfoertner ◽  
Hocine Oumeraci ◽  
Matthias Kudella ◽  
Andreas Kortenhaus
Keyword(s):  
Wind Turbines ◽  
Offshore Wind ◽  
Irregular Waves ◽  
Modular System ◽  
Wave Loads ◽  
Wave Loading ◽  
Offshore Wind Turbines ◽  
Additional Stability ◽  
The Stability ◽  
Foundation Structure

The Ocean Brick System (OBS) is a modular system consisting of hollow concrete precast blocs (10m x 10m x 10m) piled up like cubes and interconnected to create a stiff, light and strong structure which can be used for artificial islands, artificial reefs, elevation of vulnerable low lands, deep water ports, breakwaters and foundation of offshore wind turbines. The paper focuses on the experimental results on the wave loading and the stability of the OBS used as a foundation of the support structure of offshore wind turbines. Diagrams for the prediction of total horizontal forces, vertical forces and overturning moments induced by irregular waves on the OB-structure are derived and verified through additional stability tests and stability analysis.

Pitch Angle Control of Floating Offshore Wind Turbines by H∞ Control

2014 ◽  
Vol 134 (8) ◽  
pp. 1096-1103 ◽  
Author(s):  
Sho Tsujimoto ◽  
Ségolène Dessort ◽  
Naoyuki Hara ◽  
Keiji Konishi
Keyword(s):  
Wind Turbines ◽  
Pitch Angle ◽  
Offshore Wind ◽  
Offshore Wind Turbines ◽  
Floating Offshore Wind Turbines
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