1. CIVE 4311 Design Design Principles Need Problem Formulation
Abstraction
Analysis
Implementation

2. CIVE 4311 Design Design Definition: Selection of alternatives
Constraints:
Negotiable
Non-negotiable
Examples

3. CIVE 4311 Design Problems (and sub-problems) Solution Search
Similar solutions (GO-BY)
Exhaustive Analysis (Brute-Force)
Elegant approach (only if necessary)
Elegant can take more time than brute- fprce.
Time is money.
Elegance only if nothing else will work.
Examples

4. CIVE 4311 Design Search concepts:
Eliminate paths that do not satisfy goals
Find wrong answers.
Once a path becomes infeasible, abandon that path.
Use desired end state to guide solution
Work problem backwards, try to meet in middle.
Examples

5. CIVE 4311 Design Design Goals Safety Reliability Durability
Public acceptance
Environmental compatibility
Ease of operation
Ease of maintenance
Affordable

6. CIVE 4311 Design
Design Triangle
Fast
Pick Two
Good
Cheap

7. CIVE 4311 Design
Models
All engineering design and analysis use models.
Examples of models:
Computer programs
Equations
Free-body diagram
Physical models
Statistical models

8. CIVE 4311 Design
A model should never be more complex than is necessary to achieve its purpose.
Occam's razor

9. CIVE 4311 Design Develop/Use Models What am I asking from the model?
Is the model accurate enough to answer the question?

10. CIVE 4311 Design Models are good at identifying poor solutions.
Models are poor at identifying good solutions.
Models are best used as tools to find wrong answers.

11. CIVE 4311 Design Analogies (A problem solving technique)
Direct (GO-BY)
Fantasy
Symbolic
Personal

12. CIVE 4311 Design Idea Diagrams Morphological charts
Used to generate solution paths to explore/select.

13. CIVE 4311 Design Scoring Tools Used to select solutions
Decision Matrix
Rank Ordering
Requires metrics to assign value to different important design goals.