Aircraft Operations Typical Atmospheric Environment Modeling And Simulation

In the stage of aircraft manufacture and flight test, flight dynamics simulation system is the core part. Among it, the meteorological environment simulation plays a key role to the simulated flight of an aircraft, and the wind shear and turbulence is also the main atmospheric environment to influence airplane’s safety operation. So strengthening simulation study of the two models will have practical significance for improving the simulated flight fidelity.This article introduces the definition, the characteristic, and the influence to aircraft operation of wind shear and turbulence, uses the engineering modeling approach to make a simulation modeling research and analysis on it, which including micro-downburst model, various gust models and turbulence model. It respectively uses "1-consine", triangular and trapezoidal model to present a simulation analysis on the gust, skillfully combines the "1-consine" model with the trapezoidal model to produce a more reasonable gust model. It utilizes the vortex ring modeling to achieve the simulation to downburst, and simply analyzes the different change process of atmospheric wind velocity under this environment condition according to the figure result. Then the paper describes two numerical model –the Dryden and Von Karman model to simulate turbulence, analyzes their principles, establishment and differences,selects the Dryden model to present a simulation experiment in an engineering practical view, and verifies the reasonability of the model.Finally, with scientific extraction and statistics of an airline’s real QAR data, the paper uses statistics theory to calculate the related turbulence parameters, puts in the designed Dryden model, gets the figure of turbulence simulation. This further validates the model, meets the demand of simulated flight for atmosphere environment simulation and produces a certain practical significance.