Due to light design and high speed of operation, power transmission shafts may have to endure several transient resonances during start up and shut down procedures. These transient resonances may damage the support structure and the shaft itself, if not controlled effectively. Earlier work demonstrated that a semi-active controller is simple and effective, and it has clear advantages over most existing control techniques. However, this initial attempt used one actuator, and consequently had some limitations. It is proposed to extend the earlier work in this paper by using two actuators. Experimental observations show that it is possible to achieve a reduction of the peak displacement of 90%, and traverse at least the first three critical frequencies safely.
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