The nonlinear absorber, which has a cubic spring connection with a viscous damper, is analyzed by using the Lindstedt-Poincae (L-P) method. Based on the L-P method, the parameters of the non-linear absorber including the coefficient of the nonlinearity and the mass ratio or stiffness ratio are optimized such that the bandwidth of the "suppression band" is greatly broadened and the4 "band shifting" is also avoided.
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