Downloaded from https://www.everyspec.com APPENDIX C MIL-STD-31000A Annotations. Notes or symbols attached to 3D models that provide additional information not inherent in the model geometry such as tolerances, notes, flags, and symbols for properties such as surface finish or weld types. Attributes. Non-geometric data stored in 3D model files. B-Spline (Basis Spline). A mathematical representation of a curve or surface using polynomials. Boundary. The limit or extent of a geometric entity or object. Boundary Representation (B-Rep). The geometric representation of 3D objects employing explicit geometry with a consistent topological structure.
Geometry consists of entities that are points, curves (including straight lines), and surfaces (including flat planes). Topological entities consist of vertices, edges, and faces that define the relationships among geometric entities. Closed. A curve or surface without a starting or ending point. Computational Fluid Dynamics (CFD). A set of numerical techniques for simulating and analyzing fluid flows. Computer Aided Design (CAD). Any of a class of computer software programs used to design manufactured or constructed objects, such as buildings, power plants, vehicles, weapons systems or their subsystems or components. Computer Aided Manufacturing (CAM).
Use of computer software to control and manage manufacturing processes, such as automatically coordinated operations of conveyor systems, cutting and forming machines, and riveting and welding machines. Conic. Any portion of cone, which is defined as a three-dimensional shape tapering smoothly from a flat circular base to a point. 58