l4 - 16.810 16.810 Engineering Design and Rapid Prototyping...

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16.810 16.810 Engineering Design and Rapid Prototyping Engineering Design and Rapid Prototyping Lecture 4 Computer Aided Design (CAD) Instructor(s) Prof. Olivier de Weck January 6, 2005
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Plan for Today ± CAD Lecture (ca. 50 min) ± CAD History, Background ± Some theory of geometrical representation ± SolidWorks Introduction (ca. 40 min) ± Led by TA ± Follow along step-by-step ± Start creating your own CAD model of your part (ca. 30 min) ± Work in teams of two ± Use hand sketch as starting point 16.810 2
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Course Concept today 16.810 3
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Course Flow Diagram (2005) 16.810 CAD Introduction FEM/Solid Mechanics Design Optimization CAM Manufacturing Training Hand sketching CAD design Optimization Revise CAD design Assembly Parts Fabrication Problem statement Final Review Test Learning/Review Deliverables (A) Hand Sketch (B) Initial Airfoil (D) Final Design (E) Completed Wing (F) Test Data & (C) Initial Design Structural Tunnel Testing optional (G) CDR Package Xfoil Airfoil Analysis FEM/Xfoil analysis Assembly Cost Estimation Design Intro / Sketch & Wind 4
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What is CAD? ± Computer Aided Design (CAD) ± A set of methods and tools to assist product designers in ± Creating a geometrical representation of the artifacts they are designing ± Dimensioning, Tolerancing ± Configuration Management (Changes) ± Archiving ± Exchanging part and assembly information between teams, organizations ± Feeding subsequent design steps ± Analysis (CAE) ± Manufacturing (CAM) ± …by means of a computer system. 16.810 5
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Ref: menzelus.com Basic Elements of a CAD System Input Devices Main System Output Devices Computer Keyboard Mouse CAD Software Database Hard Disk Network Printer CAD keyboard Plotter Templates Space Ball Human Designer 16.810 6
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Brief History of CAD ± 1957 PRONTO (Dr. Hanratty) – first commercial numerical- control programming system ± 1960 SKETCHPAD (MIT Lincoln Labs) ± Early 1960’s industrial developments ± General Motors – DAC (Design Automated by Computer) ± McDonnell Douglas – CADD ± Early technological developments ± Vector-display technology ± Light-pens for input ± Patterns of lines rendering (first 2D only) ± 1967 Dr. Jason R Lemon founds SDRC in Cincinnati ± 1979 Boeing, General Electric and NIST develop IGES (Initial Graphic Exchange Standards), e.g. for transfer of NURBS curves ± Since 1981: numerous commercial programs ± Source: http://mbinfo.mbdesign.net/CAD-H istory.htm 16.810 7
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Major Benefits of CAD ± Productivity (=Speed) Increase ± Automation of repeated tasks ± Doesn’t necessarily increase creativity! ± Insert standard parts (e.g. fasteners) from database ± Supports Changeability ± Don’t have to redo entire drawing with each change ± EO – “Engineering Orders” ± Keep track of previous design iterations ± Communication ± With other teams/engineers, e.g. manufacturing, suppliers ± With other applications (CAE/FEM, CAM) ± Marketing, realistic product rendering ± Accurate, high quality drawings ± Caution: CAD Systems produce errors with hidden lines etc… ± Some limited Analysis ± Mass Properties (Mass, Inertia) ± Collisions between parts, clearances 16.810 8
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l4 - 16.810 16.810 Engineering Design and Rapid Prototyping...

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