Solid Rocket Grain Configuration Variational Design Method Based on Geometric Constraint Sketch

In order to design solid rocket grain configuration intuitively and accurately, this paper introduces a 3D feature design method based on the variational design technology which is popular in the field of Mechanical Product Computer Aided Design. First of all, with the help of geometry constraint solver, the fuzzy concept of grain configurations can be converted to a geometric constraint sketch. Then, through the definition of grain feature entities and design rules, as well as the identification algorithm of Color-Marked Burning Surface in the process of Boolean Operation, designers can implement the grain feature definition, detailed design, calculation of grain mass property and burn back simulation all in one sketch. Finally, a grain configuration design package is developed and a finocyl grain sample is presented to show the effectiveness of this grain design method.