Simulation of multimodal vibration damping of a plate structure using a modal SSDI-Max technique

Abstract

Modal synchronized switch damping on inductor control is a vibration damping technique that combines the advantages of both semiactive and active control techniques based on a modal strategy. This method allows targeting any unwanted vibration mode of a structure while using a semiactive autonomous synchronized switch damping on inductor damping technique. This article presents a performance analysis of an improved modal synchronized switch damping on inductor approach called “SSDI-Max.” The particularity of this new approach is to maximize the self-generated voltage amplitude by a proper definition of the switch instants (voltage inversion) according to the chosen targeted mode. Following the basic modal synchronized switch damping on inductor technique, the switch is synchronized with the chosen modal coordinate extremum. In the investigated approach, the voltage is increased by waiting for the next voltage extremum following immediately any targeted modal coordinate extremum in a given time window. This article presents simulations performed on a model representative of a clamped plate. The damping results are given in the case of multimodal, pulse, or noise excitations. This article analyzes the performance of the observer used to focus on a given mode and the influence of the control time window on the damping performance of the system. The results show that substantial damping increase can be obtained with a very slight modification of the control architecture and the same control energy.