大机动无人机飞行轨道计算中两个问题的分析

本文讨论无人机作大机动飞行时,轨道计算中必须考虑的两个问题。 一个问题是按照大机动无人机的油箱结构,考虑燃料消耗和前后左右的波动所引起的无人机重心位置的变化。这个变化引起的作用在无人机上的力矩的变化对无人机进入和退出大机动时的飞行参数有明显的影响。另一个问题是da/dt的计算,文中推导了准确计算的公式,按此公式考虑无人机转动受下洗气流的影响,可以准确地计算出阻尼力矩的影响。 在轨道计算中计及这两个问题后,不仅可以计算出无人机在大机动飞行中高度和速度的波动,而且可以计算出滚转角的波动,这和实际飞行情况是比较接近的。

Analysis of Two Questions in the Calculation of the Flight Trajectory of a Certain High-Maneuver Pilotless Aircraft

Spine questions that were negligible in the calculation of the flight trajectory of low-maneuver .pilotless aircraft should be taken intoaccount in the calculation of the flight trajectory of high-maneuver pilotless aircraft so as to get perfectly clear the complex flight process of the high-maneuver pilotless aircraft. The following are the two questions considered in the paper.One is the variation of the center of gravity of the aircraft, which arising from the consumption and wave motion of the fuel, may lead to the variation of the moments acting upon the aircraft. The variation of these moments may apparently affect the flight parameters of the aircraft when it throws itself into and withdraws from the passes in and out of high-maneuver flight. The other is the method of the calculating (da/dt). In this paper we have made the formula of calculting (da/dt) by considering the influeance of the down-wash airflow upon the revolution of the aircraft and exactly calculating the influance of the damping moment.Considering the two questions in the calculation of the flight trajectory, we may calculate not only the wave motion of the altitude and velocity of the aircraft, but also the wave motion of the roll angle of the aircraft. These motions do actually exist.