Numerical analysis of suppressing vibration for flexible beam with inlaid viscous fluid unit

A new passive vibration control has been put forward and applied to a flexible beam under the principal resonant harmonic excitation by using inlaid viscous fluid unit (IVFU). For the liquid-solid coupling model, a new algorithm is proposed that it is approximately transformed into a pure hydrokinetic model via constructing a dynamic boundary condition for the fluid region, and a numerical simulation is carried out using software FLUENT. Considering simulation results, the characteristics of fluid motions and pressures on interior beam walls are investigated. A quantitative criterion based on energy dissipation of the fluid response is proposed to indirectly evaluate the damping effect of inlaid fluid for the beam, and relative parameters are identified by a theoretical derivation.