This paper presents numerical and experimental study of an autoparametric pendulum absorber attached to a vertically moving Du±ng oscillator. The absorber can be highly e±cient for slightly damped systems, when correctly tuned. In the suspension of pendulum absorber, the magnetorheological damper (MR) is installed to allow control. The in°uence of system parameters: Viscous and magnetorheological damping, sti®ness of the spring, parameter which couples both systems on the suppression e®ectiveness are studied. Additionally, the in°uence of system parameters on periodic solutions and stability are analyzed using continuation techniques.