cad basic lesson

COMPUTER AIDED DESIGNAND PROGRAMMING

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UNIVERSITI TUNKU ABDUL RAHMAN(UTAR)FACULTY OF ENGINEERING AND SCIENCE

ASSESSMENT (100%COURSEWORK)

�1ST PART - COMPUTER AIDED DESIGN(HALF SEMESTER – 7 WEEKS) 50%� TEST 1 10% (WEEK 4)� TEST 2 20% (WEEK 7)� ASSIGNMENT 20% (EVERYWEEK)

�2ND PART – PROGRAMMING 50%


REFERENCE BOOK

� Dieter. (1991). Engineering Design, McGraw Hill. � F.E. Giesecke, A. Mitchell, H.C. Spencer, I.L. Hill

& J.T. Dygdon, J.E. Novak, Technical Drawing 2003, 12th Edition, Prentice Hall.

� James A. Leach, AutoCAD 2004 Instructor 2004, 1st Ed, McGraw Hill.


TODAY’S LECTURE CONTENT

1. Design Philosophy2. Role of Research3. Introduction to CAD


REALIZATION OF ENGINEERING PROJECTS AND SYSTEMS

Design Philosophy


REALIZATION OF ENGINEERING PROJECTS AND SYSTEMS DESIGN PHILOSOPHY

What is Design?“Design establishes and defines solutions to and

pertinent structures for problems not solved before, or new solutions to problems which have previously been solved in a different way.” (J. F. Blumrich, 1970)



� Design comprise of analysis and synthesis� Analysis

� Investigate and understand the function and behavior of the individual parts that form up the system of a product by using appropriate disciplines of science and engineering science and necessary computational tools.

� Synthesis� Identification of the design elements that will

comprise the product, its decomposition into parts, and the combination of the part solutions into a total workable system.



� Challenges faced in design(4 C’s of Design)*� Creativity

� Requires creation of something that has not existed before or not existed in the designer’s mind before

� Complexity� Requires decisions on many variables and parameters

� Choice� Requires making choices between many possible solutions

at all levels, from basic concepts to smallest detail of shape.

� Compromise � Requires balancing multiple and sometimes conflicting

requirements.


*Dieter (1991) Engineering Design,McGraw Hill, p3


� What makes a good design?• Satisfied/ full-filled required performance

• all preliminary issues – solved• eg. function-abilities, material selection, shelf life etc.

• Happy to the aesthetic/ ergonomic• Adequate of manufacturing/ production

processes• Cost effectives• Environmental sustainable

• no (minimum) impacts to environmental • Regulations & Standards

• EMAS - the Eco-Management and Audit Scheme• OSHA - Occupational Safety and Health Administration• BS, ASTM, DIN, MS etc



� Design process� There is no single universal approach of design

process. It can vary from 5 steps to 25 steps.

� A Simplified Approach of Design Process


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Source: Basic Module in the design process. (Asimow, 1962)


� Detailed description of Design Process*� Phase I: Conceptual Design� Phase II: Embodiment Design� Phase III: Detail Design� Phase IV: Planning for Manufacture� Phase V: Planning for Distribution� Phase VI: Planning for Use � Phase VII: Planning for Retirement of the Product


*Asimow, “Introduction to Design,” Prentice-hall, Englewood cliffs, NJ. 1962


� Design Process� Conceptual Design

� Process by which the design is initiated, collection of brainstormed concepts, and narrowed down to a single best concept.

� Embodiment Design � Strength, size, shape, material selection and spatial

compatibility are decided on this design phase.

� Detail Design� A stage of complete engineering description of a

tested and producible product.



� Design Process

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Example of Conceptual Design


UNIVERSITI TUNKU ABDUL RAHMAN(UTAR)FACULTY OF ENGINEERING AND SCIENCEPrepared by CT Loh

REALIZATION OF ENGINEERING PROJECTS AND SYSTEMS

Role of Research


REALIZATION OF ENGINEERING PROJECTS AND SYSTEMS ROLE OF RESEARCH

• Definition of Research• Research is defined as human activity based on

intellectual application in the investigation of matter*

• Standard Steps & Sequences• Identify and articulate research problems• Devise hypotheses to be proven or disproved• Collects, analyses & interpret relevant data• Integrate, compile & report conclusions• curiosities• research can use the scientific method, but not

necessary


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• Reason for research • Objectives/purposes:

• to describe a situation, phenomenon, problem or issue

• to establish or explore a relationship between two or more variables

• to explain why certain things happen the way they do

• to examine the feasibility of the conducted study• to integrate, compile and publicize to living world• to make contribution (positively) to our lovely

planet


• in short• Knowledge advancement

• Increase knowledge of mankind, culture & society• Discovery of new knowledge• Producer of Technology

• Enhancing socio-economic position• New applications to improve life quality• Increase of standard living of society

• Kyoto Protocol• Global warming• Environmental sustainable



• Types of research• Non-experimental research

• to describe the variation in a phenomenon, situation or attitude

• Descriptive, eg. surveys, case studies• Historical, eg. researching someone’s family tree• Co-relational, eg. Investigating the relationship between

parents and children• Qualitative (non-numerical) research, eg. Interviewing Mall’s

customers on services provided

• Experimental research • helps you to quantify the variation

• True experimental, base on existing or foresee problems, produces solutions

• Quasi (means as if or almost) experimental, eg. Weather forecast (matching, time scale)





� Development phases� Design

� Research

�Simple relationships of research & design



REALIZATION OF ENGINEERING PROJECTS AND SYSTEMS CAE

• Computer Aided Engineering (CAE)• ��

• Computer Aided Design (CAD)• Computer Aided Manufacturing (CAM)• CAD/CAM• Finite Element Analysis (FEA)• Computational Fluid Dynamics (CFD)


• CAD/CAM




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� Correlation Research/Design & CAE

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