Design of Control Laws for Alleviation of Ground - Induced Vibrations

Abstract

An aircraft is subject to a great number of different loads during one operational cycle. For the aircraft, not only the flight loads but also the ground loads are of importance. A crucial point is therefore the development of airframe and landing gears in an integrated design process. Semi-active landing gears are able to effectively suppress fuselage vibrations which have been excited by an unenven runway. During the design process of such control structures the dynamics of landing gear and airframe have to be known. At the example of the control design for a semi-active damper it will be shown how existing design tools can be used for the integrated design process. The design process will be described and simulation results for aircraft with semi-active landing gears controlled by a skyhook controller and a state feedback controller.