Robust acceleration and displacement control of electrodynamic shaker

This paper presents an acceleration and a displacement control of an electrodynamic shaker that cannot employ iterative control method freely. In order to extend the controlled frequency band, two controlled variables are employed in each frequency band that a response signal is larger than noise. The acceleration controller is used at higher frequency, and the displacement controller is used at lower frequency. Both controllers are coupled in series. The controllers are designed by using mu-synthesis, and a two degrees of freedom controller is designed to improve the transient response. Finally, the experiment using an actual electrodynamic shaker is carried out. A comparison between the proposed controller and single loop controller is shown