Numerical Tuning of Nonlinear Energy Sinks in Shear Buildings
Springer Science and Business Media LLC - Trang 1-14 - 2023
Tóm tắt
A nonlinear energy sink (NES) is an energy-dependent absorber that has gained popularity as it can resonate with any mode of the primary structure. An NES mitigates the primary structure’s vibrations in two different forms. In the first form, a one-directional energy flow is generated from the structure to the NES where the vibrating energy is consumed by the absorber damping. In the second form, the NES induces an irreversible energy flow from the structure’s low-damped, low-frequency modes to the high-damped, high-frequency ones where the vibrating energy is more easily dissipated by the damping of the structure. These two NES mechanisms, however, are very sensitive to energy variations and is common that the performance of previously tuned NES can be dramatically reduced even by small variations in the primary system energy. In this work, we present a numerical method to tune arrays of NES connected to shear building structures subject to random vibrations. The methodology guarantees that each NES in the array is tuned at a different energy level, providing robust vibration attenuation against random excitations in a broader range of input energies intensities. To introduce the proposed method, the dynamic model of a shear building is used. This structure is numerically excited using a seismic accelerogram scaled to obtain different energy intensities.
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