Abstract
Vibration of an electronic equipment is unavoidable in the design, transportation and operation stages. As a result, vibration test is indispensable for making its quality proof. Broadly speaking, vibration test can be roughly classified into sinewave and random tests. The major purpose of this thesis is to study the random vibration control of an inverter-fed electrodynamic shaker. First, the structure and operating characteristic of shaker are studied, and its dynamic model is found. Then a current-controlled PWM inverter is designed and implemented. The feedback controller is augmented by a command feedforward controller and a robust disturbance feedforward controller to let the armature exciting currents possess excellent tracking performance with low distortion. After surveying the existing random vibration standards and specifications, an acceleration controller scheme structure is arranged. In the proposed acceleration control scheme, a command feedforward controller and a robust disturbance feedforward controller are also employed to let the acceleration controller performance be insensitive to system parameter variations. Finally, for improving the electric quality of the developed inverter-fed shaker system, its electromagnetic interference (EMI) noise is measured and analyzed. Then accordingly, an EMI filter is quantitatively designed to meet the chosen standard. The validity of all the designed circuits and controllers is confirmed by simulation and experimental results.