Controlstructure interaction for micro-vibration structural control

The giant magnetostrictive actuator (GMA) is a typical actuator used in micro-vibration control applications. Research in the area of micro-vibration control has been conducted, but the effects of controlstructure interaction have not been considered in most of the previous studies. Only hydraulic actuator and linear motor models have been developed to investigate actuatorstructure interaction. To investigate the role of controlstructure interaction (CSI) with the new GMA and multi-degree-of-freedom (MDOF) coupling platform system for micro-vibration control, computational models considering the interaction between the GMA and structure are developed in this paper. The models show that the dynamics of the GMA and the structure are tightly coupled. The model is further verified through experiments. Numerical results of a control study in which the multi-degree coupling platform system does and does not consider CSI are compared. The results demonstrate that consideration of the CSI and the dynamics of the GMA can improve the performance of a controller significantly. Consideration of this interaction and the dynamics of the GMA is essential when modeling a micro-vibration control system.