Abstract
Proof mass actuators have long been an accepted and reliable method of vibration control. With the advent of new piezoceramic technology, the proof mass can now be driven by a piezoceramic linear motor. A linear motor has been designed and its performance is evaluated by comparing it against a Physik Instrument piezoceramic stack translator. Both linear motors are used to actively add damping to the bending modes of a section of the NASA Phase Zero Evolutionary Model. A modal test has been done on the test structure and its mode shapes, natural frequencies and damping ratios have been recorded. In the unlikely event of a power failure on board such a structure, a backup control scheme is desired. Viscoelastic damping material is incorporated into the newly designed actuator to improve the stability of the closed loop system and to offer good `shut down' performance in case of a power failure. Actuator performance such as force output, stroke length, and control implementation are compared.
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