Computer Aided Applications MMJ 1543

Dr Jamaludin Mohd Taib [email protected] http://www.fkm.utm.my/~jamalt

Lecture 1 1 Aided Design

Computer Geometric Graphics Modelling

CAD

Tools in design Process

The integration of computer graphics and geometric model to serve the design process

Lecture 1 2 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: drawing and design report

Lecture 1 3 Contribution of CAD in design

 Conceptualization Geometric modeling, manipulation and  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, 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 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 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 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.  2000’s: Integration of CAD/CAM: STEP (concurrent engineering) and other application Cloud of points geometric modeler: reverse engineering

Lecture 1 8 Evolution of CAD

 Computer graphics

 Computer aided drawing and drafting

 Computer aided design

 Intelligent system

Lecture 1 9 Research Interest by well known CAD center MIT

CAID (Computer Aided ) develop computational tools that facilitate 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 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 Course contents

 Geometric Modeling  Design tool within the scope of CAD  Geometric Reasoning  Research in CAD

Lecture 1 12 Geometric Modeling

 Type of modeling: wireframe, surface and solid  Representation, entities, topologies  Parametric and feature based modeling  Transformation  Neutral File

Lecture 1 13 Design Tools within the CAD scope

 Use of sketch in engineering analysis  Finite element analysis  Introduction to current technology

Lecture 1 14 Geometric Reasoning

 Understanding of geometrical properties of the model  Using the geometrical properties to create intelligent system

Lecture 1 15 Research in CAD

 Feature Recognition  Intelligent Traffic Flow System

Lecture 1 16 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