Research On Flight Simulation Modeling Under Complex Atmospheric Environment And Establishment Of Real-time Simulation Platform

The pilot needs rapid response to cope with various air disturbance during the flight owing to that the aircraft would encounter several kinds of atmosphere.With the rapid development of the aviation transportation industry,higher requirements have been put forward for the flight safety and comfort of civil aircraft.As the reason that flight simulator can accurately reproduce the aircraft and the air environment,the development of flight simulator has become an indispensable part of the aviation industry.The key to develop flight simulator is to build real-time flight simulation system which depends on the model accuracy.This paper has simulated the dynamic response process of that the aircraft flies through air disturbance on the basis of building the flight dynamics model under two typical complex atmosphere environments setting about from the simulation fidelity and designed a runtime flight simulation platform.A three dimensions wind field models with high fidelity are established for two typical wind fields of atmospheric turbulence and micro-downdraft.This paper has computed a discrete recursive turbulence model which extends the velocity along the wing and vertical direction.This method has the advantage of the small calculation memory and isotropic characteristic through the comparison with statistics and correlation analysis.And this paper has corrected the micro-downdraft model based on the vortex principle.It shows that the model has a good performance in the runtime flight simulation by validation of the wind speed scale and shear scale.This paper has built the aerodynamic model according to the Boeing 737 aerodynamic coefficient curve data and compared the computational efficiency and computational accuracy of the linear interpolation,spline interpolation and neural network prediction methods during calling the aerodynamic coefficient.The paper established the whole dynamic model combining with the motion equations of six degrees.It indicated that the overall dynamic model can meet the real-time simulation fidelity requirements and be used for research of aircraft handling qualities by the validation of the trim,roll,phugoid and Dutch roll condition parameters.On basis of the wind field model,aircraft dynamic model,this paper has simplified the atmosphere disturbance to the influence of the wind velocities and gradient for the plane motion equation and aerodynamics.The flight has been simulated that the aircraft fly through the turbulence and micro-downdraft by thenumerical simulation method according to the modified dynamic model containing the wind disturbance.The problems of the dynamic response during the flight has been researched and at the same time shows the flight simulation model established can satisfy the fidelity that the plane fly through the complex atmospheric disturbances.This article has built a graphical interface for real-time flight simulation program using the development method of facing object implementing the function to control the flight from outside hardware command based on the flight dynamic model.The program can display the aircraft state in the form of instrument and 3D viewer.It proved that the program could be used in the flight simulator to afford the condition parameters of the aircraft.