六自由度飞行实时仿真和功率谱法比较

大气紊流是飞机巡航状态中影响飞机运动的主要大气扰动现象,以奖状飞机和波音747为例,研究飞机受大气紊流影响所产生的飞行姿态变化。使用了两种方法进行飞行仿真,一种是基于六自由度飞行力学方程的实时仿真法,另一种是基于线性化小扰动方程组的响应频谱法。通过与试飞数据进行比较,分析两种方法的优缺点。研究表明,六自由度飞行实时仿真可以更好地模拟大型飞机大气扰动下的飞行状态,较准确地表征各项参数变化特性。

The Comparison Between Real-time Flight Simulation and Power Spectrum Density Method Based on Six Degrees of Freedom

The atmospheric turbulence is the main atmospheric disturbance affecting the flight. In this paper, the airplane of Citation 550 and the airplane of B747 are exampled to analyse the motion error affected by the atmospheric turbulence. Two simulation methods are used. The one is real-time simulation based on six degrees of freedom flight dynamics equations. The other is power spectrum density method based on the lineation small-perturbation equations. Compared with the data of flight tests, pros and cons of two methods have been studied. The results show that real-time simulation based on six degrees of freedom flight dynamics equations is more accurate and could be used for the simulation of large aircraft.