l3a_cad - 16.810 16.810 Engineering Design and Rapid...

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16.810 16.810 Engineering Design and Rapid Prototyping Engineering Design and Rapid Prototyping Instructor(s) Computer Aided Design (CAD) January 16, 2007 Prof. Olivier de Weck Lecture 3a
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16.810 2 Plan for Today ± CAD Lecture (ca. 50 min) ± CAD History, Background ± Some theory on geometrical representation ± FEM Lecture (ca. 50 min) ± Motivation for Structural Analysis ± FEM Background ± Break ± Start creating your own CAD models (ca. 2 hrs) ± Work in teams of two ± Follow “User Manual” step-by-step, sample part ± Then start on your own team projects ± Use hand sketch (deliverable B) as starting point
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16.810 3 Course Concept today last time
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16.810 4 Course Flow Diagram (2007) CAD Introduction FEM/Solid Mechanics Avionics Prototyping CAM Manufacturing Hand sketching Initial CAD design FEM analysis Optimization Revise CAD design Assembly Parts Fabrication Problem statement Final Review Test Learning/Review Deliverables (A) Requirements and Interface Document (B) Hand Sketch (D) Manufacturing and Test Report with Cost Estimate (C) Solidworks CAD Model, Performance Analysis Design Intro / Sketch Fabrication, Assembly, Testing (E) CDR Package + Guest Lectures
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16.810 5 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.
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16.810 6 Basic Elements of a CAD System Input Devices Human Designer Computer CAD Software Database Output Devices Hard Disk Network Printer Plotter Keyboard Mouse CAD keyboard Templates Space Ball Ref: menzelus.com Main System
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16.810 7 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-History.htm
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16.810 8 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 ±
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l3a_cad - 16.810 16.810 Engineering Design and Rapid...

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