ASE ANALYSIS AND TESTING OF LCA

摘要

Extensive presence of lightweight composites in the LCA airframe and use of high bandwidth actuators for flight control has led to significant levels of structure-control coupling / aeroservoelastic interactions, with direct implications for the dynamic stability of the aircraft in flight. It was necessary to introduce notch filters in the feedback path to minimise aeroservoelastic interactions and to guarantee sufficient stability margins in the structural frequency range. The analytical approach and test procedure adopted for the prediction and measurement of these interactions are presented here. Representative results from computa- tion and test are presented and their use in the design of notch filters is explained.