Week 1_MIET2093_Intro Eng Design and Graphics

Prévia do material em texto

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MIET2012 
1 
Course outline, Assessments, Tutorials 
MIET2093 
Computer Aided Design 
 
by: 
Dr. Toh Yen Pang 
tohyen.pang@rmit.edu.au 
9925 6128 
B251.3.22 
School of Aerospace, Mechanical & Manufacturing Engineering 2 RMIT University©2015 
Course Contacts 
•  Course Coordinator and lecturer: Dr Toh Yen Pang 
e-mail: tohyen.pang@rmit.edu.au 
Weekly consulting hours: Monday 2pm-4pm 
 
•  Tutor contact: 
Please refer to the Blackboard 
•  Meetings during consulting hours require a confirmed appointment. Time 
slots of 15mins will be allocated to each student due to large class size. 
•  Meeting times outside consultation hours are available in special 
circumstances only and never without an appointment. 
•  Working hours: 9am – 5pm. 
•  E-mails will be answered within 24 hours during working hours. 
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School of Aerospace, Mechanical & Manufacturing Engineering 3 RMIT University©2015 
Form a group of maximum 5 members 
10-minute discussion 
Your group will be provided with either envelope A or B 
A 
B 
Envelope A (Group A) 
- A physical part 
Envelope B (Group B) 
- Drawing tools 
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10-minute discussion 
Group A will receive an object which shall not be shown 
to Group B 
Group A can only provide a description of the object 
(shape, dimension, size, colour, material) to Group B, 
without revealing it 
Group B is to create a technical drawing of the object 
that a manufacturer can produce 
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Summary: Class Activity 
Group work & discussion 
Effective oral and written communication 
Description of geometrical features &Technical drawing 
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Knowledge and Skills Require 
Graphics 
language 
Word 
language 
Dimensions & Notes 
Visualization is the ability to mentally picture things that do not exists. 
Visualization Using line types 
Geometric 
construction 
Projection 
method 
Engineering Drawing 
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School of Aerospace, Mechanical & Manufacturing Engineering 7 RMIT University©2015 
Assessments for MIET2093 
Quizzes (Four quizzes with a total of 20%) 
Closed book class test in computer lab, week 6, one and a 
half hour duration, (20%) 
Term Project (25%) 
•  Group project will start in Week 4, and written report due in Week 12 
•  Late Penalty applied 
End of semester closed book exam in computer lab, two 
hours duration: (35 %) 
•  Students must satisfy the mandatory hurdles of: 
 passing the final class test; submitting the group project 
School of Aerospace, Mechanical & Manufacturing Engineering 8 RMIT University©2015 
Course outline (1/3) 
Teaching 
Week 
Lecture Topics Tutorial topics Assessments/Tasks 
Week 1 Introduction to 
Engineering Design & 
Graphics 
Introduction to Enovia 
and Getting Started 
with CATIA 
 
Week 2 Sketches: Freehand 
& 2D sketches 
Introduction to 
Sketcher Workbench 
Make up lecture for 
labour day 
Wednesday (11 March) 
18:30-20:30, B80.04.11 
Week 3 Drawing: 2D & 3D 
solid modeling 
Part Design: Basic 
Features 
 
Week 4 Projections and Views Part Design: Dress up 
Features 
 Quiz 1 
Group Project (Max. 5 
member team) 
!
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Teaching 
Week 
Lecture 
Topics 
Tutorial topics Assessments/Tasks 
Week 5 Pictorial 
drawing: 
isometric 
Part Design: 
Additional Features 
 
Week 6 Pictorial 
drawing: 
Auxiliary 
projections 
3D modelling 
(emphasise on 
mulitiviews and 
auxiliary), Additional 
Features 
Quiz 2 
Mid Term Test 
(Saturday, 18 April; 
10:30-12:30pm 
Building 56, level 4 PC 
labs) 
Week 7 Pictorial 
drawing: 
Section Views, 
Thread & 
Fasteners 
3D modelling 
(emphasise on 
section views), 
Reusing Data 
 
Week 8 Dimension & 
Tolerance 
Generative Drafting 
Fundamentals 
 
Week 9 Assembly & 
Drafting 
Assembly Design 
Workbench 
 
!
Course outline (2/3) 
School of Aerospace, Mechanical & Manufacturing Engineering 10 RMIT University©2015 
Teaching 
Week 
Lecture 
Topics 
Tutorial topics Assessments/Tasks 
Week 10 Reverse 
Engineering 
3D scanning (AMP 
Building 55.4.1) 
Quiz 3 
Week 11 Rapid 
Prototyping 
3D Printing (AMP 
Building 55.4.1) 
 
Week 12 Summary Assembly Design 
Workbench + Drafting 
Quiz 4 
Group Project submission 
SWOT vac 
week 
 Final Exam (Saturday, 6 June; 
10:00-13:00pm 
Building 56, level 4 PC labs) !
Course outline (3/3) 
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Lectures + (Tutorials Week 1-9, 12) 
Mon Tue Wed Thu Fri 
AMP (Week 10 – Week 11) 
School of Aerospace, Mechanical & Manufacturing Engineering 12 RMIT University©2015 
Course Learning outcome (1/3) 
Understand the engineering design process and its role in 
graphic communication process. 
Upon successful completion of this course you should be able 
to: 
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Course Learning outcome (2/3) 
Generate and interpret engineering technical drawings of 
parts and assemblies according to engineering design 
standards. 
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Course Learning outcome (3/3) 
Use CAD software to generate a computer model and 
technical drawing for a simple, well-defined part or assembly. 
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School of Aerospace, Mechanical & Manufacturing Engineering 15 RMIT University©2015 
Summary Learning outcome 
Sketching 2D CAD 
3D CAD Drafting 
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Teaching and Learning Approach 
Lectures Assisted 
Learning in 
labs 
Peers and 
Collaborative 
learning in labs 
Real-world Team 
Projects 
Assessment: 
Exam/Tests 
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Academic Integrity: 
•  Group are encourage to work in groups (for group project) and discussions 
between students are strongly encouraged 
 
•  However, quizzes, mid term test and final exam have to be your own work. 
•  As such, you cannot submit results prepared by another student. 
•  Any case of detected plagiarism will be treated as per University policy and 
will result in an academic hearing with possible failure of the course and 
exclusion from your course. 
•  It is also an offence for you to allow your work to be plagiarised by another 
student. 
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Preparation of 
Tools 
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Set of Mathematical Instruments 
1. Pencils 
2. Compass 
3. Triangles 
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Graph Papers 
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Reference Books 
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www.3ds.com/academia/ 
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3DS Academy 
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3DS Academy Register2/03/15 
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School of Aerospace, Mechanical & Manufacturing Engineering 26 RMIT University©2015 
Email- Do Not reply to Announcement 
tohyen.pang@rmit.edu.au 
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MIET2012 
27 
Lecture 1: Introduction to Engineering 
Design & Graphics 
MIET 2093 
Computer Aided Design 
 
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Objectives 
•  Introduction overall aspects of engineering design process 
•  Specific role engineering graphics, technical drawing and 
visualization at various stages of engineering design 
•  Describe the important of graphics used to support the 
engineering design process 
•  Documentation and writing technical reports 
•  Role of CAD in Engineering Design 
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What do these 
‘creations or 
designs’ have 
in common? 
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Common… 
They are ‘created’ for a ‘purpose’, a ‘function’. 
All have some soft of shape, a ‘form’ 
The shape relates to the function, the usage of the devices, 
aesthetics, etc. 
All are made by using ‘material’. 
Virtually all have ‘cost’ consideration. 
Others have: ‘safety’, ‘environmental’, ‘aesthetics’, 
‘usability’, ‘comfort’, …. considerations. 
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3-minute discussion 
What is ‘Engineering Design’? 
Describe the engineering design process. 
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What is Engineering Design? 
Engineering design is a problem-solving process that uses 
scientific knowledge, resources, and existing products to 
create new products and processes. 
Knowledge 
Recourses 
 
Process 
 
??? 
 
Product 
 
 
System 
 
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School of Aerospace, Mechanical & Manufacturing Engineering 33 RMIT University©2015 
The Aims of Engineering Design 
The designer aims to achieve the best possible results in the 
design process, particularly by achieving optimum quality of 
designed products in the shortest time at minimum design 
costs, especially with respect to low life-cycle costs, societal 
acceptability, etc. 
 
These days greater emphasis is being placed on the ‘voice of 
the customer' and on the 'whole-life cost" of a product. 
MIET2012 
Engineering Design 
Process 
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School of Aerospace, Mechanical & Manufacturing Engineering 35 RMIT University©2015 
Eng’g Design Process 
Engineering design process requires a 
clear understanding of customer needs, 
materials, capital, time requirements, 
functions and performance expected of 
that product. 
Common procedure for designing a 
new or improved product: 
Problem identification 
Ideation 
Refinement/Analysis 
Implementation 
Documentation 
Problem 
identification 
Analysis 
Documentation 
Refinement 
Ideation 
Decision process/ 
Design selection 
Implementation 
School of Aerospace, Mechanical & Manufacturing Engineering 36 RMIT University©2015 
The basic role of engineering design is to provide solution 
for problems and to fulfill needs for products, services or 
systems. 
The engineering design process begins with definition of 
the problem, which often called needs analysis or needs 
assessment. 
Engineering Design Process: 
(I) Identify the problem and the need 
Products must also meet government standards regulation 
and adhere to the standard or codes of professional 
organization (conventions) 
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School of Aerospace, Mechanical & Manufacturing Engineering 37 RMIT University©2015 
The aim is to understand what the problem is 
What does the client want? 
What is the problem that the design is to solve? 
The objectives (goals) and constraints of the problem 
should be identified 
Objectives: summary of the needs that the design is to 
satisfy (helps us to choose among alternative design 
configurations) 
Constraints: the design must satisfy design 
specifications (helps to decide acceptable or not) 
Needs Assessment 
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Search similar designs 
•  Patents: no need to reinvent the wheel 
 
At this stage, often called the ideation stage (brainstorming), 
many idea—reasonable and otherwise—are collected 
•  Seek quantity of concepts not quality 
•  No judgement or analysis of concepts 
Engineering Design Process: 
(II) Ideations or Generate Concept (1/2) 
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Engineering Design Process: 
Ideations or Generate Concept (2/2) 
Technical sketching is frequently used during the ideation stage 
The ability to freely create technical sketches allows designer 
present and share idea and record them—so one can refer back 
to solutions, inspirations, and breakthrough that come to light 
during this creative stage of the process 
Example : Ideation Sketches 
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Sketch & Technical Drawing 
Freehand sketches capture and document the ideation process. 
Later in the process, CAD models and drawings capture the 
design and sufficient details necessary for manufacturing. 
Example : 
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Engineering Design Process: 
(III) Decision process/Design selection 
The design team selects various features of the concepts 
generated in the ideation stage and combines them into one or 
more promising compromise solutions. 
At this point all the possible solutions or concepts are evaluated 
and attempts are made to simplify it so that it performs 
efficiently and is easy to manufacture, repair and even dispose 
of when its lifetime is over. 
Example : 
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Engineering Design Process: 
(IV) Design Refinement (1/2) 
Refinement is an iterative process used to test the preliminary 
design, make changes if necessary, and determine if the design 
meets the goals of the project 
At this stage, technicians will use the rough sketches to create 
dimensionally accurate computer drawings and models. 
The refinement stage is 
heavily dependent on 
graphics to document, 
visualize, analyze, and 
communicate the design idea. 
http://www.motorauthority.com/news/1083379_bmw-concept-x4-dividing-by-zero 
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Engineering Design Process: 
Design Refinement (2/2) 
Design teams often construct a model to 
scale in order to analyse and refine a 
design. 
Accurate 3D CAD models can act 
as a virtual prototype, sometime 
even making it unnecessary to 
crate a physical prototype for 
testing the design. 
At this point, engineers begin to select material for component 
parts, considering factor as weight, size, cost, etc. 
http://www.bmwblog.com/2008/08/08/behind-the-design-of-the-bmw-7-series/ 
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Engineering Design Process: 
(V) Design Analysis 
Design analysis is the evaluation of a proposed design, based on 
the criteria established in the ideation phase. 
Go back to synthesis, refine a solution 
Analyse again 
Evaluate the alternative solutions 
Choose one solution 
Typical analyses performed on designs include:Functional analysis 
Property analysis 
Human factor analysis 
Simulation or experiments analysis 
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Engineering Design Process: 
 (VI) Implementation 
Implementation is the process used to change the final design 
from an idea into a prototype, product, process or structure. 
Example : 
To produce or manufacture a product, often a final set of 
production or working drawings is made, checked and approved 
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Engineering Design Process: 
(VII) Documentation 
Explain the principle of operation 
Background information 
Results of mathematical analysis, simulations, experiments & 
evaluations 
 To Manufacturing 
 
for mass production 
2-D drawings 
3-D design models 
Documentation is a process used to formally record and 
communicate the final design solution. 
The Concept 
System Analysis 
Design Specifications 
Assembly Procedures 
Materials Specification 
Technical Communications 
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Title Page 
Table of contents 
Abstract/Executive summary 
Problem identification 
Procedures 
Problem solution 
Conclusions 
Results 
Appendixes 
Bibliography/References 
Technical reports are in-depth accounts that chronicle the 
design process. 
It includes text and graphics that typically contains the 
followings: 
Documentation: Technical Report 
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No Job's 
Finished Until 
the 
Paperwork is 
Done 
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MIET2012 
Technical Graphics 
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Try to write a description of this object 
The word language is inadequate for describing the size, 
shape and features completely as well as concisely. 
You can easily understand that … 
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School of Aerospace, Mechanical & Manufacturing Engineering 51 RMIT University©2015 
1. Visualisation 
2. Communication 
3. Documentation 
Technical Graphics in 
Engineering Design Process (1/2) 
During the engineering design process, technical graphics serves 
as a tool for: 
Engineering design involves several features that cannot be 
communicated verbally, but are rather “visual images in the 
mind” (of the designer) 
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to see the problem 
& possible solutions Visualization 
Sketches 
Geometric 
model 
Detail drawings 
3D model 
to record initial ideas 
created from sketches 
used for analysis 
to record the precise 
data for production 
process 
Visualisation is the 
ability to mentally 
picture things that do 
not exist 
Communication - the 
design solution should 
be communicated to 
others without 
ambiguity 
Documentation - 
permanent record of 
the solution 
Technical Graphics in 
Engineering Design Process (2/2) 
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School of Aerospace, Mechanical & Manufacturing Engineering 53 RMIT University©2015 
Allow designer to mentally picture things in theirs 
minds that do not exist 
Good visualization skills allow designer to visualize 
motion, change the form or shape, and move around 
the image, look inside, and make other movements as 
if they were holding the object in their hands. 
Visualisation 
School of Aerospace, Mechanical & Manufacturing Engineering 54 RMIT University©2015 
Communication involves refining the initial 
sketches from the earlier step and conveying them 
with clarity. 
Communication 
Design Sketch: allowed the 
designers to quickly explore 
and communicate design ideas 
A refined 3-D model used to 
communicate the design 
without ambiguity 
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School of Aerospace, Mechanical & Manufacturing Engineering 55 RMIT University©2015 
Once the design solution is finalized, it needs to be 
documented before the actual process of creation 
can take place 
Documentation of 
technical graphics 
can be 
Documentation 
2-D drawings 
3-D design models 
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Summary 
•  Engineering Design Process 
•  Technical Graphics 
•  Computer Aided Design (CAD) 
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•  Describe the engineering design process. 
•  What is the purpose for document drawings? 
•  Why are technical drawings important for engineers and 
designers? 
•  Outline the main activities of problem identification in the 
ideation phase. 
•  How can visualization help an engineer in the design process? 
Self practice exercises 
School of Aerospace, Mechanical & Manufacturing Engineering 58 RMIT University©2015 
References 
•  Aouad, Ghassan Wu, Song Lee, Angela (2011) Architecture 
Engineering and Construction, Routledge, Florence, KY, USA 
•  Giesecke, F.E, Mitchell, A., Spencer, H.C., et al, (2010) Modern 
Graphics Communication (Fourth Edition), Pearson Prentice Hall, 
Upper Saddle River, New Jersey, Columbus Ohio.