Study And Implementation Of Viusal System In Flight Simulator

This thesis focuses on describing my work in the Civil Aviation Administration of China Technology Fund“development of visual system in flight simulator ", including: visual database creation and organization method, meteorological simulation exploration and system achievement considerations.Flight visual database contains all of topography and a variety of buildings within a specified range of the airport with large amounts of data. It is categorized as the airport model and a 3D terrain model dealt with separately. About the airport model, modeling information is obtained from the actual airport and its surrounding topographic data. According to the different characteristics of the object model, detailed modeling steps and modeling methods are given. After an aircraft into the cruise phase, a wide range of terrain becomes a major reference scenario. Affected by the flight speed, it is required that the terrain rendering is real-time and the terrain details are less. To this end, terrain modeling is complete by Creator and organized by blocks.Climate phenomena simulation is an indispensable part of the flight visual system, and its fidelity is directly related to the system’s overall effectiveness. So this thesis explores two weather simulation methods for the purpose of meeting the demand of the flight simulation visual system while maintaining the real-time basis. One is the snow simulation based on the traditional particle system, which analyzes the principle of the particle system given its application in the snow simulation; the other is our improved simulation method on 3D clouds, which is based on Gardner’s ellipse model which is improved and extended in model use and its filling.During the rendering process the scene needs continuously change with the aircraft position and attitude change in simulation training needs. Thus, the flight dynamics modeling and its solution is briefly described. The system uses a client / server architecture. The server is responsible for calculating flight data. It real-time calculates the six degrees of freedom data controlling the aircraft trajectory and attitude, and passes the results to the client through the network. In terms of the aircraft position and attitude, the client continuously processes the visual rendering. As the flight control input the flight simulator joystick is responsible for manipulating the operation of the aircraft model. Both the program structure and its implementation detail are described in the thesis. System test and application results show that: the system has the main features of a flight simulator visual system and has practical application value.