Active Buffeting Vibration Alleviation Demonstration of Intelligent Aircraft Structure for vibration dynamic load alleviation

摘要

The various fields of the application of intelligent active structures for military aircraft are discussed and results from a special detailed investigation of active structure are presented. The detailed investigation deals with heavy structural vibrations which can be observed at wing and vertical tail of high performance aircraft flying at high angles of attack by vortices originating from wing leading edge and from front fuselage/canard. The resulting wing/fin dynamic loads may lead to increased material fatigue. A number of different passive and active concepts have been investigated to minimize the excitation of the wing/fin or to alleviate the resulting structural vibrations. Active system concepts were suggested as an efficient way for active buffet load alleviation. A collaborative research project was initiated between EADS ― D Military Aircraft , the former DaimlerChrysler Aerospace - Military Aircraft Division, the German Aerospace Centre (DLR) and DaimlerChrysler Research and Technology within the framework of the Advanced Aircraft Structures Research Program. Four concepts were investigated in detail within this project: An active rudder, an active auxiliary rudder, a piezo-controlled interface and a system of surface-mounted or structurally integrated piezoelectric patch actuators. The feasibility of all these concepts could be proven and their performance could be assessed in an extensive theoretical analysis that involved the complete aircraft system, as well as in wind tunnel tests on the rudder concepts and, for the piezo-controlled concepts, in tests on a laboratory demonstrator that was conceived, designed and manufactured to be dynamically equivalent to a typical fighter fin. In addition, a materials qualification program was initiated in order to demonstrate the compatibility of structures with integrated piezo-ceramic actuators with the requirements for fighter aircraft structure. In this way the maturity of this new technology could be shown.