Simulation Research For Flight Liquid Height Based On The Object-Oriented Technology

Computer Simulation is an advanced technique in the fields of design and test, and also an important way to test and evaluate the effectiveness of dynamic and intricate system. Over the past decades, computer modeling and simulation technology, have made a great advantage on different theories and methods, and been widely applied to the carrier rocker system design and manufacture. The benefits of computer simulation based on mathematical models, partly or even completely instead of physical models, are well understood: higher work efficiency, shorter development cycle, lower cost and more safety. And to meet the need of further research in the development of low temperature propellant system, the real-time flight simulation technology has become a hot focus, and the related functional simulation system is in urgent need in those rocket research departments.Considering the characters and requirement of the advanced simulation application, an integrated simulation system software frame, including a user model-design method, is studied in detail, The work is mainly carried out as following aspects:(1) The basic theory and. design method of the object-oriented technology, as well as the radical concept of modern advanced simulation technology, are analysed. After that, the basic theory of the integrated simulation system combined with modeling-experiment-analysis function is discussed.(2) Based on the object-oriented programming method, an integrated simulation system software is developed to simulate the whole real-time flight liquid height, and to provide a perfect software environment for the development, debug, digital algorithm test and performance evaluation of the on-board software. The basic function interfaces are complete, and easy to expand and reuse. Besides that, its hierarchy makes it easy to separate the user model subsystem from the simulating subsystem. This may allow the user to design his own simulation models, construct his own simulation object subsystem, and then add them into the system project, to realize the whole simulation process.(3) The method of how to express, realize and disperse the mathematical model of continuous system is discussed. And also the mathematical models of liquid oxygen and hydrogen are elaborated in details. After optimizing, the simulation models are gained.(4) Aiming at the requirement of the real-time simulation for some type of carried rocket, considering the current situation of simulation application, a simulation model library of the carried rocket system, including the main simulation and test models, is set up.The works mentioned above has a great value in engineering practice because of its modularization and hierarchy. As far as it goes, it can improve the simulation efficiency effectively, help the designer concentrate on accurate modeling and then constructing model-system for simulation, by lighten his works on programming.