r. i. t mechanical engineering engineering design brief case study: what is the engineering design...

R . I . TMechanical Engineering

Engineering Design

Brief Case Study: What is the Engineering Design Process and

Why is it Critical?

Rochester Institute of TechnologyMechanical Engineering Department

Rochester, NY USA

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Questions…

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Session Objectives

• Design process overview• Problem statement• Voice of the Customer• Voice of the Engineer• Generate and Select Concept

R . I . TMechanical Engineering

Session Objectives

• Design process overview• Problem statement• Voice of the Customer• Voice of the Engineer• Generate and Select Concept

R . I . TMechanical Engineering

Design Process(Ulrich & Eppinger Exhibit 2-2)

• Phase 0: Planning

• Phase 1: Concept Development

• Phase 2: System-Level Design

• Phase 3: Detail Design

• Phase 4: Testing and Refinement

• Phase 5: Production Ramp-Up

DPM

MSD I

MSD II

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Planning (U&E)

• Doing this now!• Identify market opportunities• Consider product platform and architecture• Assess new technologies• Research available technologies• Identify production constraints

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Concept Development (U&E)

• Identify Customer Needs• Establish Target Specifications• Generate Product Concepts• Select Product Concepts• Test Product Concepts• Set Final Specifications

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Session Objectives

• Design process overview• Problem statement• Voice of the Customer• Voice of the Engineer• Generate and Select Concept

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“We need a better ladder”

• Take 2 minutes and design a better ladder.

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Read handout

• What’s changed…?

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Session Objectives

• Design process overview• Problem statement• Voice of the Customer• Voice of the Engineer• Generate and Select Concept

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Read handout

• What’s changed…?• Customer/market • Can capture the Voice of the Customer

• Take 4 minutes• Write a set of 4-5 customer needs for your client.

• Prepare a brief statement to the class: describe customer and needs.

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“We need a better ladder”

• Take 2 minutes and design a better ladder

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Was this easier?

• Hopefully yes!

• Can we do better? Yes!

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---Break---

• Take 10 minutes and come back for the Voice of the Engineer

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Session Objectives

• Design process overview• Problem statement• Voice of the Customer• Voice of the Engineer• Generate and Select Concept

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Voice of the Engineer

• Functional decomposition:• What functions does the product/process need to

perform?

• What constraints are present?

• Core function of a ladder (all scenarios)?

• Ask, “How is the device going to do that?”

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Function Tree

• Take 5 minutes and come up with a list of functions that YOUR ladder needs to perform• Function is an active statement: verb-noun

• Note: We will spend more time on this in class, so don’t worry if it’s not perfect today!

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Metrics and Specifications

• How are you going to measure how well those functions are performed? (Metric)

• What is your threshold for success? (Specification)

• These require feasibility analysis

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Session Objectives

• Design process overview• Problem statement• Voice of the Customer• Voice of the Engineer• Generate and Select Concept

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Concept Generation

• Take 2 minutes: each team member brainstorm how to perform a single function on your ladder’s function tree• Ex: 5 team members can develop ideas for 5 functions

• The process has provided structure for solving your problem – this should be much easier!

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Morphological Chart

• A tool that will allow you to assemble complete system ideas from your list of function concepts.

• More on this later…

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Function A Function B Function C Function D

A1 B1 C1 D1

A2 B2 C2 D2

A3 B3 C3 D3

A4 B4 C4 D4

Functions

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Design a Better Ladder

• These system concepts are ideas for better ladders.

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Concept Selection

• Take 2 minutes and decide which concept is the best

• What was your team’s process?

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Selection Criteria

• Evaluate each system concept against a predetermined set of criteria

• Objective, not subjective• May require some feasibility analysis• Allows you to look at the good and bad of each

system, and iterate and improve on your ideas• You will not do a complete concept selection in

DPM!

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Hand-Off from DPM to MSD

• You are now delivering a well-thought-out project.

• You know there are feasible solutions• You have reviewed the customer needs and

specifications• You are more confident that you are solving the

correct problem.

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Design Process(Ulrich & Eppinger Exhibit 2-2)

• Phase 0: Planning

• Phase 1: Concept Development

• Phase 2: System-Level Design

• Phase 3: Detail Design

• Phase 4: Testing and Refinement

• Phase 5: Production Ramp-Up

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Questions?