Computer Aided Design Applications MMJ 1543

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Tracy Holland
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1 Computer Aided Design Applications MMJ 1543 Dr Jamaludin Mohd Taib Lecture 1 1

2 Computer Aided Design Computer Graphics Geometric Modelling CAD Tools in design Process The integration of computer graphics and geometric model to serve the design process Lecture 1 2

3 Design Process Problem definition: design starts with problems Design specification: eg. Ergonomic (one person handling), load etc Literature work: search internally and externally (patent, field study etc) Concept development: Development of the concept Final concept selection: Select the final concept to develop Detail design: Detailing the design, DFA can be applied here Prototyping: Physical model or virtual object Documentation: Engineering drawing and design report Lecture 1 3

4 Contribution of CAD in design Conceptualization Geometric modeling, manipulation and visualization Analysis Analysis package, FEA, optimization, customized program Prototyping Modeling, assemblies, animation Communication Engineering drawing, documentation Lecture 1 4

History 1962: SKETCHPAD system developed by Ivan Sutherland, MIT (2D graphic) For the first time, designer can interact with the computer graphically using light pen, before computer used for

5 History 1962: SKETCHPAD system developed by Ivan Sutherland, MIT (2D graphic) For the first time, designer can interact with the computer graphically using light pen, before computer used for numerical analysis Constraint based drawing (parametric modelling) in 2012 novel method of human computer interaction and his method of handling objects pointed to current object-oriented programming Lecture 1 5

6 History 1960 s: companies were interested to develop software CADD by Mc-Docnell, CADAM by Lockheed Early application: car and aerospace companies 1970s: CAD spread widely in other sectors; film, animation, typographic etc CSG and B-Reps modeler were introduced Late 1970s: mainframe based software 1980 s Commercial software started to use solid kernel Unix based software was introduced, parametric modelling becomes reality for commercial software Lecture 1 6

7 History 1990 s Window based solid based software was introduced 1993: Solidwork was developed based on Windows Operating System by Jon Hirschtick 1995, Solid Edge become the competitor to Solidwork Other Unix based software has to transform their software to Window Based System 1999: CATIA is fully implemented using Windows NT 2000 s Full fledge integration with design in possible with the introduction of Product Data Management and Product Lifecycle Management Future: Creative Design by Computer Lecture 1 7

8 Trend of CAD according to literature available 1980 s: Early 3D development in computer graphics and end of 1980 start with application in CAM/CAD 1990 s: CAD, CAM and CAE research starts and on each area, refinement of the approaches on each area s: Integration of CAD/CAM: STEP (concurrent engineering) and other application Cloud of points geometric modeler: reverse engineering Lecture 1 8

9 Evolution of CAD Computer graphics Computer aided drawing and drafting Computer aided design Intelligent system Lecture 1 9

10 Research Interest by well known CAD center MIT CAID (Computer Aided Industrial Design) develop computational tools that facilitate designers with the process of synthesizing new concepts. CAD with environment and education University of Iowa Driving simulator, Digital Human, Human-Machine Relationship Rassenleaer Poly: Biomechanical Lecture 1 10

11 Contribution of CAD Faster time cycle in product development (paperless design) Once the model is created, the same model can be used for modeling for visualization, analysis FEA, drawing generation. Assembly: collision verification especially geometries, DFA Linking with CAM: STEP. Lecture 1 11

12 Course contents Geometric Modeling Design tool within the scope of CAD Geometric Reasoning Research in CAD Lecture 1 12

13 Geometric Modeling Type of modeling: wireframe, surface and solid Representation, entities, topologies Parametric and feature based modeling Transformation Neutral File Lecture 1 13

14 Design Tools within the CAD scope Use of sketch in engineering analysis Finite element analysis Introduction to current technology Lecture 1 14

15 Geometric Reasoning Understanding of geometrical properties of the model Using the geometrical properties to create intelligent system Lecture 1 15

16 Research in CAD Feature Recognition Intelligent Traffic Flow System Lecture 1 16

17 Interesting Facts Whirlwind, built in early 50 s at MIT cost USD4.5 million and could perform 40,000 additions/second. Today, commodity PCs perform approximately two or three billion operations/second. Lecture 1 17

Geometric Modeling Lecture Series. Prof. G. Wang Department of Mechanical and Industrial Engineering University of Manitoba

Geometric Modeling Lecture Series. Prof. G. Wang Department of Mechanical and Industrial Engineering University of Manitoba Geometric Modeling 25.353 Lecture Series Prof. G. Wang Department of Mechanical and Industrial Engineering University of Manitoba Introduction Geometric modeling is as important to CAD as governing equilibrium