In practice, an inverted pendulum can be used to model many real structures as the arms of robots, soil structures, or fluid structures. However, the study on the design of dynamic vibration absorber for inverted pendulum structures is very limited in the literature. | Vietnam Journal of Mechanics, VAST, Vol. 37, No. 1 (2015), pp. 57 – 70 DOI: A GLOBAL-LOCAL APPROACH TO THE DESIGN OF DYNAMIC VIBRATION ABSORBER FOR DAMPED INVERTED PENDULUM STRUCTURES N. D. Anh1,2 , N. X. Nguyen3,∗ of Mechanics, Vietnam Academy of Science and Technology, Hanoi, Vietnam 2 VNU, University of Engineering and Technology, Hanoi, Vietnam 3 VNU, University of Science, Hanoi, Vietnam 1 Institute ∗ E-mail: nguyennx12@ Received January 26, 2015 Abstract. In practice, an inverted pendulum can be used to model many real structures as the arms of robots, soil structures, or fluid structures. However, the study on the design of dynamic vibration absorber for inverted pendulum structures is very limited in the literature. To the best knowledge of the authors, however, there has been no study on the dynamic vibration absorber when the primary inverted pendulum structure is damped. This paper deals with the optimization problem of dynamic vibration absorber for inverted pendulum structures. Two novel findings of the present study are summarized as follows. First, the optimal parameters of dynamic vibration absorber for undamped inverted pendulum structures are given by using H∞ optimization. Second, the authors suggest a so-called global-local approach to determine approximate expressions for optimal parameters of a pendulum type absorber attached to a damped inverted pendulum structure. Finally, a numerical simulation is done for an example of the articulated tower in the ocean to validate the effectiveness of the results obtained in this work. Keywords: Dynamic vibration absorber, inverted pendulum, damped structure, globallocal approach, analytical solutions. 1. INTRODUCTION A passive vibration control device attached to a primary structure to reduce harmful vibration is called a dynamic vibration absorber (DVA). The first DVA was introduced by Frahm [1] in 1909 for mass-spring structures but it has no the damper .
