14 A. Hashemi and J. Jang the FE model of a wind turbine blade are loaded independently with three distinct loads to verify the mapping performance of the final transfer function matrix. The results demonstrate that the deflections derived directly from the FE model of the wind turbine blade and the movements obtained using the proposed method have a good correlation. Furthermore, the accuracy of the method diminished by increasing the distance of the sensors from the base of the wind turbine blade due to the natural expansion of the structure’s vibration domain in longer distance from the support. To damp the lateral vibration of the wind turbine blade, an active vibration control system was proposed including the designed LQR control system and PZT patches as actuator. Since using finite element modeling commercial software could not be feasible due to the heavy cost of computation, the semi-analytical solution is used for the implementation of controlling rules. 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