Abstract
Today, predicting the vibration characteristics in early design stages has come to occupy an important position for most of the development divisions of mechatronics equipment makers. In order to meet the request, Finite Element Analysis with feedback control by using MSC. Nastran and its TF (Dynamic Transfer Function) bulk data is proposed. In this paper, the usefulness of this method is demonstrated by an example of the analysis of hypothetical equipment named Laser Pointer System, where, the sensor locations of the control system ware optimized thought two approaches. One method is analyzing a structural normal mode that transformed by using self-developed DMAP (Direct Matrix Abstraction Program) in MSC. Nastran. It extracts the elastic deformation of a vibration mode by eliminating the rigid body motion included in the normal mode. It was found that the vibration could be optimally suppressed by aligning the sensors with the target point on the transformed mode on a straight line. Another method is using iSIGHT, the optimization software. By choosing design value as node IDs of sensors, the optimal sensor locations ware deduced that gives equivalent, or even better control result over the first method.
