Air Data Computer Simulation System Design And Simulation Credibility Assessment

Air Data Computer(ADC) is a platform for researching flight air data system. It can reduce cost and risk greatly, when using in ground experiment of integration avionics system. Then reliability and integralit of simulation system become key factors when it replaces the real system.Based on computer simulation and simulation credibility theory, ADC simulation system is designed and the credibility of this system is evaluated in this paper.Firstly, basic theory of computer simulation and a common simulation process are expatiated. Also evaluation theory and method of simulation credibility are introduced.A common ADC calculation model is built, through analyseing air data calculation principle and formulas. And then basis on this calculate model, a parameter input model of full digital simulation and a function model of semi-physical simulation are built. According to the different aims, a full digital simulation model and a semi-physical simulation model are formed.Using these models, the software of full digital system and both the software and hardware of semi-physical simulation system are designed. Then the programme of two softwares is realized under LabWindows/CVI environment.Finally, the hierarchy of ADC simulation system is compartmentalized by using Analytic Hierarchy Process, and then the weightness of every factor which effect simulation credibility is comfirmed. The credibility of ADC simulation system is evaluated by Similarity theory and Fuzzy Synthetic Evaluation (FSE). The result indicates that ADC simulation systems are well designed, and have high reliability. So it can satisfy the need of engineering application.