Abstract
To minimize the excessive vibration and prolong the fatigue life of the offshore wind turbine systems, it is of value to control the vibration that is induced within the structure by implementing certain kinds of dampers. In this paper, a ball vibration absorber (BVA) is experimentally investigated through a series of shake table tests on a 1/13 scaled wind turbine model. The reductions in top displacement, top acceleration, bottom stress and platform stress of the wind turbine tower system subjected to earthquakes and equivalent wind-wave loads, respectively, with a ball absorber are examined. Cases of the tower with rotating blades are also investigated to validate the efficacy of this damper in mitigating the vibration of an operating wind turbine. The experimental results indicate that the dynamic performance of the tested wind turbine model with a ball absorber is significantly improved compared with that of the uncontrolled structure in terms of the peak response reduction.
Highlights
In the past two decades, offshore wind farms continue to grow rapidly throughout the world [1]
The focus of this paper is to experimentally investigate the efficacy of a ball vibration absorber (BVA) through a series of shake table tests on a 1/13 scaled wind turbine model
A shake table test was conducted to explore the response of a 1/13 scaled wind turbine model with or without a ball absorber fixed at the top of the nacelle
Summary
In the past two decades, offshore wind farms continue to grow rapidly throughout the world [1]. The vibration of wind turbine towers during the earthquake or combined wind-wave loads may result in turbine damage or disfunction, causing great economical loss and social consequence Under this background, to achieve tradeoffs between the safety and economical efficiency of large wind turbine systems, structural control that could suppress excessive responses might be a feasible option. Murtagh and Basu took into account the tower-blade interaction and investigated the use of TMD for the mitigation of the along-wind forced vibration response of a simplified wind turbine [6]. Another vibration control device for wind turbine is tuned liquid column damper (TLCD), which was firstly introduced by Wilmink and Hengeveld [7] They found that the TLCD provided significant damping with only 2% effective mass whereas for the same effect at least 4% effective mass were required in the classical pendulum dampers. It is shown that implementing a BVA will significantly decrease the dynamic response of the wind turbine
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