ME180_Lecture_14_Parametric_Modeling - Parametric Modeling...

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Unformatted text preview: Parametric Modeling and Design 1 Parametric Modeling Unigraphics is a parametric modeler But, what is Parametric Modeling? And, how does it apply to what we've learned? 2 Parametric Modeling Parameters control the geometry Size & location parameters Dimensions for features Geometric parameters Constraints Tangent, Collinear, Concentric, etc. Use feature-based modeling techniques 3 Feature-Based Modeling Combinations of features Add, Subtract, Intersect Similar to other solid modelers Use Constructive Solid Geometry (CSG) and Bezier Representation (BREP) definitions Features are basic units of a parametric solid model Hole, Boss, Slot, Pocket, Pad 4 Parameters Parameters can change Parameters are similar to variables Unlike variables, parameters are never abstract Give us design flexibility 5 Planning for Design Flexibility Establish Design Intent Key dimensions and relationships must be maintained How will components fit together? How will components change as design evolves? By thinking about this early, you can design components and features as foundations 6 Planning for Design Flexibility Parametric modeling parallels the design process Starts with a 2D sketch of a portion of the component Just like a pencil and paper, except CAD Rough drawing with general shape Start adding constraints 7 Sketch Constraints Parametric modeling software solves your sketch by defining geometric and dimensional constraints You can add or remove constraints To take advantage of the parametric modeler's benefits, plan your work 8 Adding Features to Models The order of creation determines how a model is updated You have the ability to reorder operations What happens to the rest of the model if a feature changes? 9 Editing the Model With parametric modelers, you have the ability to: Change features after they are created Modify the sketch that is controlling the geometry 10 Creating Standard Features Create piece parts Use the same parametric rules to produce standard products In Unigraphics, may create a User Defined Function (UDF) 11 Parent-Child Relationships As you have seen in Part Navigator: Parent Child Deleting the Parent feature will delete Children features 12 Final Lab Project Presentations All team members must participate 5 to 6 minutes total maximum Group will display and discuss: Fully assembled file Exploded assembly file Each group member will display and discuss a single component they modeled 13 Final Lab Project Grading 15 points: Return of project assembled & functioning 15 points: Freehand sketches of all components 30 points: Project presentation 40 points: Assembly modeling 14 Final Lab Project Grading Group Peer Grading Each group member to grade other members' contributions to the project. May be used to lower an individual's grade up to 25 points. Will not increase an individual's grade. 15 Lecture Exam 2 Lecture #15 4/26 Lecture Exam #2 25-30 multiple choice questions Material from lectures 8-14 16 ...
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