An adaptive mass damper for self‐excited oscillations

Abstract

AbstractAn adaptive tuned mass damper aiming to optimally increase the critical flow velocity of transverse galloping oscillations is presented. The structure, simply modeled as an elastically supported bluff body exposed to a steady flow, has been connected to an added mass by a spring and a dashpot varying according to an adaptive control algorithm. Based on the knowledge of a reference model, describing the optimal conditions for the system, the paper presents two procedures to design a controller that allows to identify the uncertain mechanical parameters relying on a direct and an indirect approach. In the direct case, by assuring the convergency to zero of the error between the system and the reference model variables, in the indirect case, by using a wavelet based approach for on‐line system identification. The analytical developments are validated by numerical investigations on the nonlinear system in order to assess the feasibility of the proposed control system.