A novel type of control device, vibro-impact tri-mass damper (VITM), is proposed. VITM is developed based on three types of mass dampers, including a tuned mass damper, a nonlinear energy sink, and a free mass between them. The middle mass can collide with the two side masses. First, the working principle of VITM is introduced and the equation of motion and impact model are derived. Then, experiment is conducted to validate the theoretical model of VITM. Finally, numerical simulations are performed to examine the energy dissipation feature, parameter influences, frequency and energy robustness, and seismic performance of VITM. The results show that VITM mainly relies on vibro impacts rather than device damping to mitigate structural response. The impacts are within the device thus do not increase the structural acceleration. VITM has stronger frequency and energy robustness than its counterparts and shows excellent control capacity under both impulsive and seismic excitation, providing a new method for seismic protection of engineering structure.
Key words
vibration control /
nonlinear energy sink /
tuned mass damper /
impact damper /
robustness
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