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Concept Evaluation and AHP UPDATED

# Concept Evaluation and AHP UPDATED - C hapter 9 Chapter 6...

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Chapter 9 Chapter 6 Concept Selection (Pugh) Analytical Hierarchial Process (AHP)

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What I now know... What is Engineering Design Steps in the design process Project Project Description Team Formation Team Roles Stages of Team Dynamics Project Management Design Team Calendar Work Breakdown Structure (WBS) Design Structure Matrix/Activity Network Analysis Gantt Chart Responsibility Assignment Matrix (RAM) Working Agreement Defining the Problem Assumptions, Biases and Analyzing Key Phases Weighted Objective Trees, Constraints & Functions Gathering Information Design Review Conceptualization Brainstorming, Synetics, SCAMPER TRIZ

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Pugh Concept Selection Method 1. Choose the criteria by which the concepts will be evaluated Start with the Engineering Characteristics in you House of Quality Any information obtained from background research or design reviews 2. Formulate the decision matrix Take criteria from above and put them in rows. Take your design solutions/concepts and make them the column headings 3. Clarify the design concepts This method must be performed as a team Make sure that the team agrees on which are the best design solutions/concepts to test. You may add benchmarked products as possible solutions 4. Choose the datum concept Choose one of the best concepts for the first round. A poor choice of datum would cause all of the concepts to be positive and delay arriving at a solution. Mark the datum concept as DATUM 5. Run the matrix Each concept is compared to the datum. Is concept better (+1), worse (-1), or about the same (0) (not clearly worse or better). 6. Evaluate the ratings Sum all +1, -1, 0 ratings for each concept Establish a new datum and rerun the matrix Use the highest rated concept from the first round as datum. Eliminate the lowest rating concepts from this second round. The main intent of this round is not to verify that the selection in round 1 is but to gain added insight to inspire further creativity. 1. Establish the selected concept for improvement opportunities Once the best concept is identified, look at each criteria that performed worse than the datum. Ask
Pugh Selection Chart CRITERIA CO ONCEPT D A C B Cost 1 1 1 Added Functionality 0 0 -1 Simplicity of Design 1 0 0 Availability of Materials 1 -1 -1 Ease of Manufacturing 1 1 0 Ease of Assembly 1 1 -1 Ability to Prototype 1 0 1 Comfort -1 1 -1 Weight 1 0 -1 Aesthetics -1 0 -1 SUM 5 0 3 -4 D A T U M

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W h a t i s t h e p r o b l e m w i t h t h i s m e t h o d ?
Analytic Hierarchy Process (AHP) A problem-solving methodology for making a choice from among a set of alternatives Builds upon the mathematical properties of matrices for making consistent pair-wise comparisons Important property of matrices is that their principle eigenvector can generate legitimate weighting factors Mathematically sound and intuitively correct

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Concept Evaluation and AHP UPDATED - C hapter 9 Chapter 6...

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