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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 WAS 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 TOP OF THE TOWER, INVESTIGATING TUNED MASS DAMPER (TMD), ACTIVE MASS DAMPER (AMD), AND HYBRID MASS DAMPER (HMD). THE THEORY PROPOSED BY DEN HARTOG WAS USED TO DETERMINE THE COEFFICIENTS OF THE ABSORBER AND THE LINEAR QUADRATIC REGULATOR (LQR) WAS APPLIED TO OBTAIN THE OPTIMAL CONTROL VARIABLES INTRODUCED BY THE HYDRAULIC ACTUATORS. THE HMD, THE MAIN CONTRIBUITION OF THIS PAPER, REACHED 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.
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