Lecture 4 ENGR3030U Zeid Ch 9 10 15 and 16

Lecture 4 ENGR3030U Zeid Ch 9 10 15 and 16 - ENGR3030U Fall...

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Unformatted text preview: ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. Solids Ch. 9 Features Ch. 10, Mass Properties Ch. 15 Objectives: Geometry and topology. Primitives and their manipulation. Half spaces. Constructive solid geometry (CSG). Boundary representation (B-rep). Sweeps. ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. Objectives (cond): Features and primitives. 3D sketching. Feature representation and creating features. Parametrics. Relations and constraints. Feature manipulations. Solids Ch. 9 Features Ch. 10, Mass Properties Ch. 15 ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. Objectives (cond): Importance of mass properties in CAD design. Calculate curve and contour lengths. Calculate areas and volumes. Calculate centroids and inertia properties. Use Gauss quadrature. Assembly modelling (Ch. 16). Solids Ch. 9 Features Ch. 10, Mass Properties Ch. 15 ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. Complete solid solid in which point in space can be classified as being inside, outside, or on object. Valid solid no dangling edges or faces. Unambiguous solid has one and only one interpretation. Automation tasks (CAPP, NC, FEM, etc.) require solid to meet all above criteria. Introduction Solids ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. Introduction Solids Figure 9.1 A typical solid model. ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. Geometry metric information. Actual dimensions defining entities of object. Topology combinatorial structure. Connectivity and associativity of object entities. Geometry and Topology ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. Figure 9.2 Difference between geometry and topology. Geometry and Topology ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. Figure 9.3 Nonuniqueness of solid models: the primitive approach. Geometry and Topology ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. Figure 9.4 Nonuniqueness of solid models: the features approach. Geometry and Topology ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. Entities used depend on modelling approach. Primitive approach uses primitives. Features approach uses sketches. Curves and surfaces used for sketches. Primitives building blocks. Simple basic shapes that can be combined by Boolean operations to create solid. Considered valid off-the-shelf solids. Solid Entities ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. Figure 9.5 Common primitives. Solid Entities ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng. Figure 9.6 Boolean operations. Solid Entities ENGR3030U Fall 2009 George Platanitis, Ph.D, P.Eng....
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Lecture 4 ENGR3030U Zeid Ch 9 10 15 and 16 - ENGR3030U Fall...

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