Adaptive Acceleration Control of an AC Power Source-Fed Electrodynamic Shaker

This paper proposes a novel sinusoidal acceleration controller for electrodynamic shakers driven by voltage-mode AC power sources (ACPS). The presented scheme is based on the interaction of two control loops: one for the shaker´s acceleration regulation and another for the ACPS output voltage control. A robust model reference adaptive controller (RMRAC) is employed for both voltage and acceleration regulation. The zero-pole cancellations that could occur at the origin of the s-plane leading to unbounded signals within the acceleration closed-loop operation are avoided by including the unstable zeros of the plant as part of the zeros of the reference model. The dynamic modeling of the electrodynamic shaker, the structure, design, digital implementation and the experimental feasibility of the acceleration controller are described in detail.