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Welcome

The Design Process

Engineering Design

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Today’s Learning Outcomes

By the completion of today's meeting, students should be able to:

Prescribe the design process.

Identify the elements of each design process.

Express the relation between various blocks of the design process.

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Prescriptive Design Process

A Prescriptive Design Process that outlines the steps necessary to progress through a design.

Therefore,

a basic understanding of the Problem Definition is required for any design.

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Prescriptive Design Process

Each stage has Inputs, has Design Steps that have to be performed, and produces Outputs (or product).Outputs from one stage become the Inputs for the next stage.

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Problem Definition

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Sources of information

The sources of information for P.D. :current technical literature, codes, regulations, experts, … etc.Design methods:objectives tree, pairwise comparison chart , … etc.Means:literature review, brainstorming, user surveys, questionnaires, interviews, ..

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Conceptual Design

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Sources of Information

Competitive products: additional sources of information for conceptual design, …Design methods: functional analysis, function-means trees, quality function deployment morphological charts, requirement matrices, performance specifications, ... etc.Means: brainstorming, synergy, reverse engineering (dissection), benchmarking, analogies, ... etc.

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Preliminary Design

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Sources of Information

Preliminary design sources of info: heuristics (rules of thumb), simple models, physical relationships, ... etc.Design methods: physical modeling, experimental verification, ... etc.Means: numerical modeling & simulation, prototype development, lab & field testing, proof-of-concept testing, ... etc.

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Prescriptive

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Sources of Information

Perspectives sources of info: laws & regulations, design codes, handbooks, component specifications, ... etc.

Design methods: CADD, ... etc.

Means: formal design reviews, public hearings, beta testing, ... etc.

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Communication

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Sources of Information

Design communication sources of information: feedback from clients and users, itemized lists of required deliverables, … etc.