An improved nonlinear vibration absorber with adjustable stiffness and rotating mass

Abstract

A novel approach for vibration reduction is proposed by improving an adjustable stiffness nonlinear vibration absorber (NVA) with a rotating mass system. The adjustable stiffness is realized by a buckling Euler beam and an active control system. The rotating mass is consisted of a primary mass block and two rotating mass blocks. The dynamic responses are analyzed based on nonlinear output frequency response functions. The results indicate that, in comparison to the adjustable stiffness NVA, the enhanced NVA can efficiently suppress the resonance in steady state response. Moreover, the new vibration absorber can improve the robustness of the adjustable stiffness NVA. The mass ratio and the angular velocity are two key parameters of the new vibration absorber with optimal values for effective vibration reduction. The new vibration absorber introduces new possibilities for incorporating the adjustable stiffness and the rotating mass system in the design of NVA.