1. Design Process and Visualization
Lecture 2
Autumn Quarter

2. Topics For Today Questions on Drawings 1 and 2 ?
Purdue Visualization Assessment
Online through WebCT (22 minutes)
> H191 > Purdue Visualization
Introduction To Engineering Design Process
Design Visualization & More Freehand Sketching
Work on Drawings 3 and 4
Permanent Seat Assignment Today
Instructor:
Make it a practice to ask for questions from the day or days before.
We use the Purdue Visualization test to measure the gains in visualizing objects. It is on line.
We introduce the design process here to get the students thinking about design and to show them how they need to know their engineering graphics so that they can do the documentation for their designs. To that end, there will be additional instruction today on visualization and sketching.
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3. Engineering Design Process - Chap 14
IDEATION
REFINEMENT
IMPLEMENTATION
Instructor:
In the simplest form, there are three steps to go from idea to finished product.
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4. What Is Design? PROCESS OF CONCEIVING OR INVENTING IDEAS
COMMUNICATING THOSE IDEAS TO OTHERS
PRIMARY PURPOSES:
PERSONAL EXPRESSION
PRODUCT OR PROCESS DEVELOPMENT
Instructor:
Design is the essence of engineering. Scientists discover facts and engineers use the information to make useful things to improve society.
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5. The Art Of Design CREATIVITY AND EXPRESSION
DESIGNING FOR LOOK AND FEEL
DESIGN FOR FUNCTION AND PURPOSE
Instructor:
Certainly in engineering, design allows for creativity and expression. But most engineers don’t focus on the look and feel they focus on function and purpose and the analysis that it takes to make a working device or system. It is the industrial designers that design for look and feel and typically the industrial team has both engineers and designers.
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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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7. The Ideation Process PROBLEM IDENTIFICATION Problem Statement Research
Data Gathering
Objectives
Limitations
Scheduling
Instructor:
This next set of slides breaks down the design process into more steps or details.
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8. The Ideation Process PRELIMINARY IDEAS Notes Sketches/Models
Brainstorm
Synthesis
PRELIMINARY DESIGN
Evaluation
Selection
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9. The Refinement Process
MODELING
Geometric
Simulation
Animation
Charts, Graphs, Diagrams
DESIGN ANALYSIS
Properties
Mechanism
Functional
Human Factors
DESIGN VISUALIZATION
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10. The Implementation Process
PLANNING
PRODUCTION
MARKETING
FINANCE
MANAGEMENT
SERVICE
DOCUMENTATION
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11. 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
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12. Solid Object Features Features or Attributes of an object: Edges Faces
Limiting Element(s)
Vertices
Shape (of faces)
Instructor:
Have the students point out the features of attributes of this object.
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13. General Visualization Techniques
Solid Object Combinations
Additive
Subtractive
Planar Surfaces
Cutting Plane - normal, inclined, oblique
Symmetry
Instructor:
Chapter 5 in BTG talks about features and visualization.
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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
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15. Missing Line Problem – Example 1
One or more lines are missing. Add lines to make views complete.
Instructor:
When students are looking at objects, they need to be thinking about surfaces and cylindrical shapes and what these attributes would have in a multiview or orthographic drawing. A piece of paper can be thought of as a face and it can appear true size, foreshortened, or as an edge or line. In the case of missing lines in orthographic views, we have to see surfaces in one view and edges of a plane in other views. Note that in this case we see the front surface as a shape but we see it as a line in the top and right side views. Anywhere two surfaces meet they form an edge or a line and we can see that line in adjacent views.
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16. Example 1 Solution Missing Line Problem
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17. Missing Line Problem – Example 2
One or more lines are missing. Add lines to make views complete.
Limiting element
Instructor:
Here we have a half of a cylinder. In this case we show a line in the right side view at the top that is the limiting element for the curved surface.
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18. Example 2 Solution Missing Line Problem Instructor:
Point out the hidden lines and center lines and how they are portrayed in these views.
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19. Hint: Verify by sketching the isometric view
In Class Exercise
Given the Top and Front views shown here, how many right side views can you draw?
Discuss at your table
Instructor:
Have the students work for three to five minutes and then pick a table to see how many views they have created. See if another table has more (there are an almost infinite number of views)
Hint: Verify by sketching the isometric view
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20. Possible Solutions There are many more A B C Instructor:
The three solutions will come in when the mouse is clicked… then the text comes in on the next click.
Ask if the students think there are more solutions each time
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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
Autumn Quarter