The vertical kneader stirred blades surface reconstruction based on adaptive implicit T-splines

The vertical kneader is the key equipment of developing solid propellant, and its stirred blades surface shape is more complex. In this paper, the geometric attributes of stirred blades surface point set, such as normal, curvature, are calculated. By selecting point set number threshold and mean curvature threshold in sub-cube, the three-dimensional T-mesh is constructed adaptively based on the octree and subdivision. Through exploiting the surface fitting model, the transform from surface reconstruction problem to optimization problem is done. By solving the linear equations, the implicit T-splines control point coefficients and the stirred blades surface reconstruction are obtained. The experimental results show that the method can effectively realize the complex topological surface reconstruction.