Research on Target Center-of-gravity Position for Active Center-of-gravity Control System

Abstract

Aiming at the problem of determination of the target center-of-gravity(CG)in active CG control system design,a new design method of target CG is proposed,for the guidance of active CG control system design. Firstly,references involving with relation between drag and CG are analyzed,and theoretic minimum-drag CG position expression is summarized. On this basis,the design of target CG for active CG control system is discussed with the consideration of tolerances in determination of aircraft CG. Finally,the control strategy for active CG control is addressed by taking Airbus’s A340 as an example. The results show that it is not always as good as further backward for minimum-drag CG. The target CG should be designed based on minimum-drag CG and tolerances during CG measuring,in which fuel plays a great role. By properly designing the fuel transfer threshold,a balance between drag-reduction,fuel-economy and alleviation workload for relating system/equipment could be struck.

Keywords

• active center-of-gravity control
• drag reduction
• target center-of-gravity
• cg control strategy