Main Article Content
In this paper, a new active control procedure is presented using the developed critical damping concept. This strategy uses the well-known structural dynamics theories for improving the performance of critical damping (CD) method. In conventional CD algorithm, only the effect of first vibration mode has been incorporated to calculate the actuator force. The proposed method develops the critical damping concept so that the actuator force is formulated by considering the effects of the first and second vibration modes. This strategy improves the efficiency of the critical damping technique. Since the total damping matrix corresponding to the dynamic system should be semi positive definiteness, a novel approach is suggested here for determining the actuator and sensor locations. According to the proposed concepts, a new active control algorithm is obtained. Efficiency and stability of the proposed method is assessed by active control of vibrations of some shear buildings subjected to various dynamic loads. Results demonstrate considerable merit of the proposed active control algorithm compared to the common critical damping method.
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