基于Von Karman模型的三维大气紊流仿真

Simulation of Three-Dimensional Atmospheric Turbulence Based on Von Karman Model

为提高飞机飞行动力学系统的仿真逼真度,提出一种新的大气紊流模型,并研究出在实时仿真中的实现技术。改变以前基于D ryden模型的建模方法,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,得出逼近于VonKarman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D ryden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。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 proposes a new atmospheric turbulence model, and further studies the realization technique in real time simulation. To calculate the dynamic turbulence, this paper purposes a new modeling method, based on Von Karman model which can not be used to simulate directly,instead of the model of Dryden used before. By rationalizing Von Karman mode, the atmospheric turbulence is generated in real time to calculate filter parameter. The analysis in frequency domain and simulation resuit in time domain show that this model has better statistical characteristic than the Dryden 3 - D model, and has solved 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 lifelike in wind field, and it has some practical effect to the development of simulator.