飞行性能仿真中风场模型的研究

The Research on Wind Field Models in Flight Performance Simulation

为提高飞机飞行动力学系统的仿真逼真度,本文根据实际飞行中的风场类型,重点对影响飞行性能的微下冲气流及大气紊流进行深入研究,提出两种风场的数学模型。其中重点介绍了对不能直接用于仿真模拟的Von Karman大气紊流模型进行有理化处理,改变了以前基于Dryden模型的建模方法,得出逼近于Von Karman模型的新的紊流模型,确定新的滤波器参数,从而在时域内实时生成大气紊流。通过频域上的分析比较和时域的仿真计算,结果表明该模型生成的紊流比以往的Dryden模型更好地符合了大气数理统计特性,并解决了Von Karman的仿真实现问题。该文的数值模拟算法可直接应用于模拟器的空气动力学运动方程,从而使飞机在风场中的模拟更加真实,对模拟器的研制具有实际意义。

In order to enhance the fidelity of fight dynamic system simulation, this paper, according to the wind fields in practice, concerns mainly in the influence of down-burst and atmospheric turbulence, and proposes their mathematical models. To calculate out the dynamic turbulence, this paper purposed a new modeling method, based on the model of Von Karman which can not be used to simulate directly,instead of the model of Dryden before. By rationalizing Von Karman mode, the atmospheric turbulence is generated in real time to calculate out filter parameter. The analysis in frequency domain and simulation result in time domain show that this model has the better statistical characteristic than the Dryden 3-D model, and solve the realization problem in simulation of Von Karman model. The numerical analogue algorithm in this paper could be used in atmospheric dynamic motion equation, in order to make the simulation more reality in wind field,and it has some practical effect to the development of simulator.