CIVE 4311 Design Design Principles Need Problem Formulation Abstraction Analysis Implementation

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

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

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

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

CIVE 4311 Design Design Triangle Fast Pick Two Good Cheap

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

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

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

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.

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

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

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