主动重心控制系统目标重心位置研究

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

目标重心位置的确定是主动重心控制系统设计的一个难题,提出一种目标重心位置设计方法,以指导主动重心控制系统的设计。通过梳理阻力与重心关系的相关参考文献,总结出理论最小阻力重心位置的关系式;考虑飞机重心测量的误差,对主动重心控制系统的目标重心位置的设计进行研究;并以空客A340飞机为例,对主动重心控制策略进行分析。结果表明:阻力最小重心位置并不总是越靠后越好,目标重心位置应根据理论最小阻力重心位置和重心测量的误差进行设计,且燃油重心的测量误差对其影响很大;通过合理设计燃油转输门限,能在减小阻力、节省燃油消耗与减轻燃油系统/设备工作负担之间取得平衡。

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.First⁃ly,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 ad⁃dressed 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.