Design And Implementation Of Visual Scene Simulation Sub-System In The Spaceflight Launch Training System

With the rapid development of the spaceflight project, better training for organization&command of the spaceflight launch is needed. The existing training mode which is based on thereal equipments is influenced by various factors, and is high cost and not flexible way. Base onthe modern computer simulation technology, many simulation and training software are designed.It becomes a popular training way to apply the simulation software to certain training tasks.By the requirement of visual simulation scene in the spaceflight launch simulation andtraining system, this paper researches on some related modeling techniques, such asthree-dimension entity modeling, visual object controlling and special effect, and organization&command procedure modeling. Finally, the models are integrated into the spaceflight launchsimulation and training system.First, the popular MultiGen Creator software is used to model visual scenes and objects’three dimension entry models. Some key modeling technologies are analyzed. The threedimension models database of visual simulation scenes and objects is created, including launchground, varieties of equipments and lots of devices. Considering the real-time requirements ofthe simulation system, some models optimization technologies are discussed from modelingprocedure, models database and models package. The improvement effect is various.Second, the common visual scene displaying way is studied and an improvement way ispresented. Using the advanced Vega Prime’s API software interface to MFC, many controllingparameters of visual simulation objects can be flexibly adjusted to many different visual effects.Furthermore, on applying some preset advanced function in Vega Prime, many visual specialeffects can be easily implemented.Third, by the modeling requirements of organization&command procedure, thecharacteristics and application ranges of several UML charts are analyzed. Then the static anddynamic models of organization&command procedure are created from the use case diagram,class diagram, and sequence diagram in UML. The automatic generation way of the programcode frame is studied by using the sequence diagram in UML. Based on the requirements ofinformation exchange between training procedure data and supposed task data, the softwareinterface of UML’s sequence diagram and XML is designed to transmit the instructions.Finally, the designed visual simulation sub-system is integrated into the spaceflight launchsimulation and training system. It is used to train the new spaceflight launch commanders in theacademy of equipment. The experimental results show that the visual simulation sub-system isvery useful and the training effect is improved obviously.