Inverse control applied to structural excitation systems

Kurzfassung

Accurate control over excitation sources is a necessary requirement for the study of structure-borne noise mechanisms. This is especially true when the main focus is set on the influence of real operational forces acting on the structure. Under laboratory tests, it is not always possible to have real operational conditions. A relevant case is an aircraft engine attached to a wing, where it is necessary to reproduce the operational forces on the structure without having an engine available. The defined task is to accurately reproduce excitation forces that were previously obtained from simulations. For this purpose, it is possible to use an adaptive controller to drive a shaker that will inject into the structure an exact copy of the reference forces already calculated. The main objective of the controller is to compensate the transfer function created between exciter and structure in order to generate the previously simulated loads at the attachment points. The following work presents the development of such adaptive controller and the laboratory tests performed in order to validate the proper operation of the system. As a first step in the development of the control system, a SISO controller is used in combination with a generic structure.