The paper presents the basic features of the steady-state performance of a two-degree of freedom system consisting of a main linear spring mass system under periodic forcing, the motion of which acts parametrically on the motion of an attached absorber system. Terms, nonlinear in the absorber motion, act back on the main mass and with appropriate choice of tuning parameters, “absorption” of the main mass response can be obtained. Experimental results for this type of device are compared with a theoretical solution obtained from a first order asymptotic approximation. Comparison is also made with the performance of a linear tuned and damped absorber.

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