Research On The Mechanism And Application For The Unified Description Of The Digitized Model Of The Launch Vehicle

In the face of the current international and domestic grim situation,the aerospace industry,which is related to national defense and security,is in urgent need of domestic and self-controllable 3D CAD structural design software tools.Take the current 3D structure design software and its data format,which is used in the development of the current launch vehicle as the research object.Many problems appears in the process of launch vehicle development,such as design information is lost during data exchange of heterogeneous models,modeling history of 3D models is lost during data exchange,unable to record and transmit design semantic information for 3D models.On the other hand,the 3D software used in the design of launch vehicle is not domestic software,the launch vehicle plays an important role in national security.There is considerable risk of loss design information because of the stop update and shut down of the business software company.Research the domestic and international solutions on the problems during the exchange of heterogeneous models,the lost of modeling history,and the lost of design semantic.Research the solutions of the long-term preservation for the 3D model around the world.The paper analyzes and classifies the structure features of the 3D model for the launch vehicle,which expresses and describes the 3D model of the launch vehicle based on the ontology.The work proposes a hierarchical ontology model to realize the unified description of the 3D model for the launch vehicle.The example of the rocket structure pipe and cable are used to verify the effectiveness of the hierarchical ontology.The article researches the principle of the 3D structure design software such as the Creo,and realizes the development of the interface which is based on the unified description method and the principle of the structure expressed by Creo.The interface includes the automatic reading module and the automatic 3D reproduction module,which is used to storage the design information for several decades.The functional module is verified by the tank and tail section of the launch vehicle.The unified description method and functional module is proved effective by facts.On the basis of the unified description of the 3D model for the launch vehicle,the article researches the piping system and cable system in the 3D model.Firstly,the article investigates the existing methods of the pipeline design,and proposes the solution from the geometry point of view,which realizes the rapid design of the two arbitrary ports on the launch vehicle.Take the parallelism of end faces of the pipe on the launch vehicle as an example,the article realizes the reproduction of tolerance information which is based on the unified description method.The unified description on the tolerance realises the redesign of tolerances at the beginning of the design stage which is based on the prediction of connection accuracy for pipelines.Through the investigation and research the layout for the cable on the launch vehicle,the article realizes the unified description methods for the cable on the launch vehicle which is based on the spline point of view.The automatic cable laying method is used to realize the rapid design on the launch vehicle.