01 MEM435 091026

01 MEM435 091026 - Introduction to 3D Solid Modeling (or)...

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1 Introduction to 3D Solid Modeling (or) Things we don’t appreciate about Pro/E (or) Considerations when purchasing a CAD package Prof. James Tangorra and Prof. Wei Sun Department of Mechanical Engineering and Mechanics Drexel University 1. Introduction 2. Evolution of model types 1. Exact vs. approximate representations 2. Wireframe 3. Surface 4. Solid 3. Pro / Engineer 4. Modeling methods 1. Constructive solid geometry 2. Boundary representations 3. Feature based 5. Model manipulation and solutions 1. Parameterization 2. Variational /Direct modeling
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2 General : The process of creating a depiction of reality, such as a graph, picture, or mathematical representation. Scientific : The representation of a physical system by a set of mathematical relationships that allow the response of the system to various alternative inputs to be predicted Business (Economics): The use of mathematics to describe a situation or a physical object. Mathematical formulas can be used to manipulate data, to develop business plans and projections, or to evaluate the impact of proposed changes on a company's operations and financial status. Person (from Wikipedia): A model is a person who is posed or displayed for the purpose of art, fashion, or other products and advertising. Modeling is distinguished from other types of public performance, such as an acting, dancing or mime artistry, although the boundary is not well defined. Appearing in a movie or a play is generally not considered to be modeling, regardless of the nature of the role. However, models generally have to express emotion in their photographs, and many models have also described themselves as actors. Definitions of Modeling
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3 3D Solid Models We need a power transmission shaft Customer ideas Must transmit the torsion load; Weight < 5 N Cost $12-15 Lifetime 2-3 yrs Need statements & target specifications J= π /2(R 4 -r 4 ) Τ max=(Torque*R)/J Engineering analysis Build structure and features such as key slots, holes, etc . CAD Solid Modeling Functional modeling and analysis
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1. Introduction 2. Evolution of model types 1. Exact vs. approximate visualizations 2. Wireframe 3. Surface 4. 3D solid 3. Pro / Engineer 4. Modeling methods 1. Constructive solid geometry 2. Boundary representations 3. Feature based 5. Model manipulations 1. Parameter based 2. Variational / direct model
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Representing 3D Objects Approximate A discretization of 3D objects Facets/mesh for surfaces Voxels/cells for volumes Methods use simple primitives to model the topology and geometry Exact Wire-frame modeling Surface Modeling Solid Modeling Precise modeling of object’s topology Mathematic representation of the objects geometry via splines, NURBS… World of Warcraft Google Sketch
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From 2D Drawing to 3D Wireframe 2D Model 3D Model
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3D Wireframe Model On which face(s) is the recess?
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This note was uploaded on 11/17/2009 for the course MEM 435 taught by Professor Sun during the Spring '07 term at Drexel.

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01 MEM435 091026 - Introduction to 3D Solid Modeling (or)...

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