针对飞行模拟机运动载荷系统中平台质心处的线加速度的算法进行了剖析，并就液压伺服作动筒的伸缩长度与飞机特定力和飞机转动率之间的关系进行了分析。提出了运动方程建模的依据，探讨了模拟机六自由度运动系统在软硬件上的合成原理，为飞行模拟机液压伺服控制在运动系统过载保护性能方面的改善及研究打下了基础。关 键 词 线性通道; 角度通道; 质心变换; 旋转率Abstract The present essay dissects the algorithm of the linear acceleration at the centre of gravity of the platform of the motion loading system, and also analyses the relations of hydraulic servo actuator’s travel distance, the aircraft’s specific force and the aircraft’s rotational rate. The essay also suggests the basis of motion equation modeling, and discusses the simulator’s six-degree-of-freedom motion system’s combination principles by the means of the hardware and software, and all these make the foundation of the research of flight simulator hydraulic servo control in improving performance of overload protection.Key words linear channel; angular channel; centroid transition; rotational rate