  This paper treats possible solutions for vibration mitigation in
reduced-order model of partially-filled liquid tank under impulsive forcing.
Such excitation may lead to hydraulic impacts applied on the tank inner walls.
Finite stiffness of the tank walls is taken into account. We explore both
linear (Tuned Mass Damper) and nonlinear (Nonlinear Energy Sink) passive
vibration absorbers; mitigation performances are examined numerically. The
liquid sloshing mass is modeled by equivalent massspring-dashpot system, which
can both perform small-amplitude linear oscillations and impact the vessel
walls. We use parameters of the equivalent mass-spring-dashpot system for
well-explored case of cylindrical tanks. The hydraulic impacts are modeled by
high-power potential and dissipation functions. Critical location in the tank
structure is determined and expression of the corresponding local mechanical
stress is derived. We use finite-elemet approach to assess the natural
frequencies for specific system parameters and to figure out possibilities for
internal resonances. Numerical evaluation criteria are suggested to determine
the energy absorption performance.
