This seminar brings some research topics developed at Escola Politécnica - University of São Paulo on passive suppression of oscillations using non-linear vibration absorbers (NVAs). Numerical studies have been developed in the last three years focusing on mitigation of parametric excitation and some flow-induced vibration phenomena. Considering a rigid body assembled onto an elastic support of time-dependent stiffness, the numerical results show that the NVA is able to bound the response of the main structure even in a scenario in which unbounded solutions are expected. Numerical results also show that the suppressor also leads to a decrease in the oscillation amplitudes due to vortex-induced vibration and galloping. Finally, for the problem of a pipe conveying fluid, the use of the NVA leads to bounded structural responses even for supercritical velocities.
7 Febbraio 2020