Abstract
Abstract This paper presents and discusses the design of a vibration control device for a 120 m high steel tubular tower of onshore Horizontal Axis Wind Turbine (HAWT). The tower is modeled using beam (own code), and shell and solid finite elements (via ANSYS). The Dynamic Vibration Absorber (DVA) is designed to be attached to the tower top, aiming to analyze Tuned Mass Damper (TMD), Active Mass Damper (AMD), and Hybrid Mass Damper (HMD). The theory proposed by Den Hartog is used to determine the coefficients of the absorber and the Linear Quadratic Regulator (LQR) is applied to obtain the optimal control variables introduced by the hydraulic actuators. The HMD, the main contribuition of this paper, reaches excellent levels of vibration reduction for the tower submitted to harmonic actions, in a transient and permanent (stationary) regime, resonant to the first vibration mode of the structure without control.
Highlights
In the 21st century, the global water crisis and environmental issues resulted in an accelerated growth in the deployment of increasingly large onshore and offshore wind turbines, with increasingly high towers, in search of technically feasible and economically viable winds
For the vibration control methodology used in this paper, the theoretical development of the Tuned Mass Damper (TMD) proposed by Den Hartog (1947) was initially used for systems with two degrees of freedom, one of which is necessary to describe the movement of the main mass and the second one referring to the secondary mass
Hydraulic actuators were added to the system in order to convert the TMD into a Hybrid Mass Damper (HMD), which is applied to the tower top to obtain a hybrid control system
Summary
In the 21st century, the global water crisis and environmental issues resulted in an accelerated growth in the deployment of increasingly large onshore and offshore wind turbines, with increasingly high towers, in search of technically feasible and economically viable winds. In Brazil, wind power production reached 14.34 GW of installed capacity in 568 wind farms and more than 7,000 wind turbines in 12 states, with the states of the Northeast Region, where the records of attendance exceed 70% of the energy produced in this region, which account for most of Brazilian production (September data according to Abeeólica, 2018) This shows that the cost of wind energy is the most competitive and viable amongst the renewable energy sources compared to the conventional ones (Burton et al, 2011 and Manwell et al, 2009). The Hybrid Mass Damper (HMD), proposed in this research, is presented as a differentiated solution to the previously mentioned studies, since, instead of being allocated to the nacelle (Hu and He, 2017), it was designed to be installed internally to the wind turbine tower (near the top) In this way, the internal space of the nacelle is saved for the installation of the electric-mechanical components of the wind turbine (Zuo et al, 2017). It is highlighted the development of constructive model of the DVA developed, in which its main components are described, in order to show the viability of design and execution of the vibration control system designed for the tower analyzed
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