The influence of various optimization procedures on the dynamics and efficiency of nonlinear energy sink with synergistic effect consideration

Abstract

The vibro-impact system under consideration consists of a primary structure, which is a linear oscillator (LO) and a vibro-impact damper coupled with it. The damper is a vibro-impact nonlinear energy sink (VI NES). The dynamics of this system and damper efficiency in attenuation vibrations of the primary structure are studied using numerical simulation. The paper examines the problem of choosing optimal damper parameters that provide the best mitigation of the primary structure energy. The optimization procedure was carried out in several stages. The multiple parameters optimization manifested a synergistic effect. This made it possible to select the most effective VI NES design. The chosen damper design provided the best energy reduction. Thanks to it, the irregular regimes of the system movement turned into the periodic ones. The damper hits both the primary structure directly and an obstacle rigidly connected to the primary structure.