Vibration acceleration control of an inverter-fed electrodynamic shaker

A novel acceleration controller for an electrodynamic shaker fed by a switc hing-mode power amplifier is presented in this paper. First, the dynamic mo del of the shaker system is found and a high-performance current-controlled pulsewidth modulated inverter is designed and implemented, Then, a sophist icated acceleration control scheme being capable of waveform and magnitude regulation controls is proposed to lessen the undesired harmonic vibration caused by snitching-mode driven power. In acceleration waveform control, th e feedback controller is augmented with a feedforward controller and robust controller for obtaining excellent waveform tracking performance over a wi de frequency range. As to the magnitude regulation control, the amplitude o f the sinusoidal acceleration is accurately controlled to be equal to the s etting value. Theoretical basis, practical consideration, and implementatio n of the proposed controllers are described in detail. Good current and acc eleration control characteristics of the designed shaker are demonstrated b y some measured results.