The nonlinear beam-slider structure, which consists of a nonlinear cantilever beam and a free movable slider, can always obtain the high-energy orbit to achieve passive self-adaption in a wide bandwidth. The efficiency improvement of this structure has been demonstrated in energy harvesting application. In this work, the nonlinear beam-slider structure is applied as a vibration neutralizer. The behavior of the 2-degree-of-freedom (2-DOF) vibration system is investigated experimentally. The trajectory of the slider, time history response of the nonlinear beam and the linear primary structure are recorded simultaneously. The results show that the nonlinear neutralizer with appropriate parameters has broader bandwidth than the linear one. However, there are multiple solutions corresponding to different vibration states of the nonlinear neutralizer in the suppression frequency range. The vibration of linear primary structure can be suppressed only when the nonlinear neutralizer obtains the certain energy orbit at the given frequency range. The free movable slider can assist the nonlinear beam to obtain the high-energy orbit in multi-solution range (28 Hz-31 Hz). In the frequency range of 28 Hz-31 Hz, the nonlinear neutralizer on the high-energy orbit enhances the vibration suppression performance.
This work investigates the interaction between a nonlinear slender clamped-clamped beam and a freely movable mass during the passive self-tuning process. The experimental and numerical results illustrate that the hardening nonlinearity caused by the beam stretch strain can broaden the frequency bandwidth. When the amplitude and curvature of the beam at the slider location are large enough, the slider could be driven to move from the side towards the centre and stop around the centre. The slider’s movement, in turn, changes the beam-slider structure’s mass distribution that shifts the frequency response functions to the lower frequency range. During this interaction between the beam and slider, the high energy orbit could be captured with amplified vibration response. Because the slider is driven by the beam vibration, the self-tuning process does not require external energy. Such a beam-slider structure could be used for the design of nonlinear energy harvesting system with the capability of passive self-tuning to acquire large amplitude vibration and thus higher efficiency.