design process and visualization

Lect 2 P. 1

Engineering H191 - Drafting / CAD

Autumn Quarter Gateway Engineering Education Coalition

Design Process and Visualization

Lecture 2

Lect 2 P. 2



Topics For Today

• Questions on Drawings 1 and 2 ?• Purdue Visualization Assessment

– Online through WebCT (22 minutes)– http://class.osu.edu > H191 > Purdue

Visualization• Introduction To Engineering Design Process• Design Visualization & More Freehand Sketching• Work on Drawings 3 and 4• Permanent Seat Assignment Today

http://class.osu.edu/

Lect 2 P. 3



Engineering Design Process - Chap 14

• IDEATION• REFINEMENT• IMPLEMENTATION

Lect 2 P. 4



What Is Design?

• PROCESS OF CONCEIVING OR INVENTING IDEAS

• COMMUNICATING THOSE IDEAS TO OTHERS• PRIMARY PURPOSES:

– PERSONAL EXPRESSION– PRODUCT OR PROCESS DEVELOPMENT

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The Art Of Design

• CREATIVITY AND EXPRESSION

• DESIGNING FOR LOOK AND FEEL

• DESIGN FOR FUNCTION AND PURPOSE

Lect 2 P. 6



The Practice Of Engineering Design

• FOR ENGINEERS IT IS DESIGN WITH ANALYSIS

• DESIGNING TO SOLVE A PROBLEM– PRODUCT DESIGN– SYSTEM OR PROCESS DESIGN

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The Ideation Process

• PROBLEM IDENTIFICATION– Problem Statement– Research– Data Gathering– Objectives– Limitations– Scheduling

Lect 2 P. 8



The Ideation Process

• PRELIMINARY IDEAS– Notes– Sketches/Models– Brainstorm– Synthesis

• PRELIMINARY DESIGN– Evaluation– Selection

Lect 2 P. 9



The Refinement Process

• MODELING– Geometric– Simulation– Animation– Charts, Graphs,

Diagrams

• DESIGN ANALYSIS– Properties– Mechanism– Functional– Human Factors

DESIGN VISUALIZATION

Lect 2 P. 10



The Implementation Process

• PLANNING• PRODUCTION• MARKETING• FINANCE• MANAGEMENT• SERVICE• DOCUMENTATION

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Design Visualization

• Eye - Hand coordination is important when sketching

• Eye - Mind - Hand connection is crucial to "ideation" sketching

• First step is make a sketch to understand the 3-D object or its design

• Next step is to evolve the design• Reference: BTG Chapter 3

Lect 2 P. 12



Solid Object Features

• Features or Attributes of an object:– Edges – Faces– Limiting Element(s)– Vertices– Shape (of faces)

Lect 2 P. 13



General Visualization Techniques

• Solid Object Combinations– Additive– Subtractive

• Planar Surfaces– Cutting Plane - normal, inclined, oblique– Symmetry

Lect 2 P. 14



Visualization Techniques For Engineering Drawings

• Image plane– Like 2D picture

• Object-Image Orientation– Gives rise to Primary Axes and thinking about

the third dimension• Multiple Image Planes

– Produces our Multiview Drawings

Lect 2 P. 15



Missing Line Problem – Example 1One or more lines are missing. Add lines to make views complete.

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Example 1 Solution

Missing Line Problem

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Missing Line Problem – Example 2One or more lines are missing. Add lines to make views complete.

Limiting element

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Missing Line Problem

Example 2 Solution

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In Class Exercise

Hint: Verify by sketching the isometric view

Given the Top and Front views shown here, how many right side

views can you draw?

Discuss at your table

Lect 2 P. 20



Possible Solutions

There are many more

A B C

Lect 2 P. 21



Assignments

• Dwg 3 – ML-2 – Add missing line(s). Sketch pictorials as needed to solve problems.– Due at end of today’s lecture

• Dwg 4 – A6 – Draw the missing line in each orthographic set in PENCIL (using red to draw the missing lines is optional)– Due at beginning of next lecture

design process and visualization

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