Targeted energy transfer and parameter design of a nonlinear vibration absorber

Through a research on two coupled nonlinear oscillators,a mechanism is clarified that for a nonlinear vibration absorber,the initial energy of the main structure is highly selected.Energy dissipation in a nonlinear vibration absorber is highly effective with a specific amount of initial energy,but the efficiency of energy dissipation is weakened as the initial energy deviates from that specific value.In other words,the single degree-of-freedom nonlinear vibration absorber will be less effective if the energy of the main structure is not within a certain interval.It is proposed that by using a well designed two-degree-offreedom nonlinear vibration absorber,a more effective targeted energy transfer can be achieved.Using a two-DOF unequal mass nonlinear vibration absorber,dissipation of vibrational energy becomes more effective and bandwidth of energy absorption increases significantly.What's more,the two-DOF nonlinear vibration absorber doesn't necessarily be heavier than the one-DOF absorber.The method for determining the mass and stiffness of the nonlinear vibration absorber is given.The above analysis is verified by numerical simulations.