Research And Implementation Of Three-dimensional Parameterization Method And Visual Interaction System For Launch Vehicle

Parametric modeling of the shape of a carrier rocket is a significant preliminary work in the conceptual design stage.An appropriate shape has a substantial impact on the overall aerodynamic performance,design efficiency,and cost of the carrier rocket.However,the theory of 3D parametric modeling of carrier rockets is not yet mature,and a significant heterogeneity is observed in the interfaces of many rocket design and simulation tools.Therefore,how to perform 3D parametric modeling of rockets efficiently and accurately,and achieve compatibility with design and simulation tools has become one of the critical research topics in the current rocket design field.This paper addresses the issues in 3D parametric modeling and post-processing in the conceptual design of carrier rockets,studies 3D parametric modeling,grid generation and quality detection,and Stereolithography(STL)technology,and proposes methods for 3D parametric modeling of rockets,grid generation and quality detection,and STL model generation and topological reconstruction,achieving satisfactory results.The specific research contents are as follows:First,this paper proposes a segmented three-dimensional parametric modeling method for launch vehicles to rapidly and accurately generate rocket shapes during the conceptual design phase.By applying the quadratic curve method in three-dimensional space,the rocket’s threedimensional shape is generated in segments,considering various types of sectional curves,and achieving rapid generation and flexible adjustment of the rocket’s three-dimensional shape.This method provides accurate geometric information for subsequent tasks such as mesh generation.Experiments show that this method has a higher efficiency compared to other mainstream parametric methods.Second,this paper proposes an efficient mesh generation and quality inspection method to meet the needs of subsequent tasks such as STL model generation and aerodynamic characteristic analysis.Using a semi-automatic mesh generation algorithm,the mesh density of the rocket surface can be adjusted in segments according to design requirements,and the quality inspection method ensures that the quality of the rocket surface mesh meets the design requirements.This method provides a reliable foundation for subsequent STL model generation and other tasks.Experiments show that the mesh quality generated by this method basically meets the current national standards.Next,this paper proposes a method based on STL model generation and topology reconstruction to address the difficulties in information exchange between launch vehicle design and simulation tools.By converting the geometric information obtained from mesh generation into a standard format STL model,compatibility and data exchange with other engineering software are achieved.At the same time,topology reconstruction technology simplifies the storage capacity of the model and improves the accuracy and completeness of the model,facilitating other analysis tasks.Experiments demonstrate the effectiveness of this method.Finally,to improve the work efficiency of designers and reduce design costs,this paper designs and implements a visual interactive system based on previous research.The system provides functions such as three-dimensional shape generation,surface mesh generation,mesh quality inspection,STL model generation,and STL model topology reconstruction.Moreover,it is developed based on the Py Qt framework,achieving good compatibility and user-friendly interaction.This paper tests the system,and the results show that the various functional modules of the system operate normally and have a user-friendly interface,meeting the expected design goals.