An integrated nonlinear passive vibration control system and its vibration reduction properties

A novel integrated nonlinear passive vibration control system with the function of vibration isolation and absorption is proposed by applying a bio-inspired isolator and a nonlinear energy sink (NES). The designed integrated system has excellent vibration isolation capability in the low-frequency bands and can decrease the resonance amplitude simultaneously. The nonlinear dynamic model of the integrated passive vibration control system is established. The displacement transmissibility is employed to evaluate the vibration reduction performance of the integrated system by the harmonic balance method. The coupling mechanism of vibration isolation and absorption is revealed through studying the effects of the parameters on the vibration isolation and absorption performance. It is found that due to the nonlinear weak coupling between the bio-inspired isolator and the NES, they can promote each other in the vibration isolation and absorption. Experiments are conducted to validate the advantageous vibration reduction properties of the system. And the design methodology of the integrated passive vibration control system is also elaborated for practical applications. The integrated nonlinear passive vibration control system would provide an innovative method for vibration control in various engineering practice.