I designed a spring and mass system (damping unknown) that is vibrated by applying a sinusoidal force to the mass using an electrodynamic shaker. The mass is estimated to be 100 Kg. The spring is actually 4 springs, each with a k value of 63.55 N/mm, supporting a platform (one spring at each corner) with the mass. Attached is the system's frequency response curve. If the shaker is set to vibrate at frequencies above the system's natural frequency, where the amplification ratio is very low, is it possible to control the acceleration that the mass is exposed to or will the inability of the system to respond fast enough, and thus have very small displacements, limit the acceleration? Is it reasonable to expect the electrodynamic shaker system, provided the feedback correction is snappy enough, to increase the driving force and be able to execute the desired displacements (resulting in desired accelerations) or will the frequency response characteristics of the system prevent this? Thanks.