The Interaction of Advanced Flight Control System and Elastic Aircraft Structure

摘要

The design strategy of the advanced flight control system development is important thought the integrated design optimisation process, which includes besides the modelling of the coupled system of the flight dynamics, also the structural dynamics, the actuators of the control surfaces and the sensors as well as the as the effects of the digital control systems. Results from structural mode coupling investigations are presented which describe the design, test verification and clearance and clearance of structural for a advanced digital flight control system. The advantages of an integrated interdisciplinary flight control system design on the basis of the coupled dynamic model derived from structural dynamic model and the flight dynamic model of the aircraft is presented. Different examples demonstrate the advantages of the integrated, interdisciplinary design. Analytical and experimental methods to avoid structural mode and flight interaction are described. Especially the design of filters to minimise interaction is outlined, using a mathematical model of the elastic aircraft which describes the coupled flight dynamics, flight control dynamics and the structural dynamics behaviour on ground and in-flight structural mode coupling tests. The paper explains design procedures, design and clearance requirements, test procedures and the correlation between mathematical model predictions and structural coupling tests as well as the aeroservoelatic model update on ground and in flight.