R. I. T Mechanical Engineering Engineering Design Brief Case Study: What is the Engineering Design Process and Why is it Critical? Rochester Institute of Technology Mechanical Engineering Department Rochester, NY USA

R. I. T Mechanical Engineering Notes Each group gets a problem statement from a different stakeholder Try to get two student groups working on each stakeholder group Goal is to illustrate why the process is important in shaping the final outcome

R. I. T Mechanical Engineering Questions…

R. I. T Mechanical Engineering Session Objectives Design process overview Problem statement Voice of the Customer Voice of the Engineer Generate and Select Concept

R. I. T Mechanical Engineering Session Objectives Design process overview Problem statement Voice of the Customer Voice of the Engineer Generate and Select Concept

R. I. T Mechanical 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

R. I. T Mechanical Engineering Planning (U&E) Doing this now! Identify market opportunities Consider product platform and architecture Assess new technologies Research available technologies Identify production constraints

R. I. T Mechanical Engineering Concept Development (U&E) Identify Customer Needs Establish Target Specifications Generate Product Concepts Select Product Concepts Test Product Concepts Set Final Specifications

R. I. T Mechanical Engineering Session Objectives Design process overview Problem statement Voice of the Customer Voice of the Engineer Generate and Select Concept

R. I. T Mechanical Engineering “We need a better ladder” Take 2 minutes and design a better ladder.

R. I. T Mechanical Engineering Read handout What’s changed…?

R. I. T Mechanical Engineering Session Objectives Design process overview Problem statement Voice of the Customer Voice of the Engineer Generate and Select Concept

R. I. T Mechanical Engineering 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.

R. I. T Mechanical Engineering “We need a better ladder” Take 2 minutes and design a better ladder

R. I. T Mechanical Engineering Was this easier? Hopefully yes! Can we do better? Yes!

R. I. T Mechanical Engineering ---Break--- Take 10 minutes and come back for the Voice of the Engineer

R. I. T Mechanical Engineering Session Objectives Design process overview Problem statement Voice of the Customer Voice of the Engineer Generate and Select Concept

R. I. T Mechanical Engineering 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?”

R. I. T Mechanical Engineering 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!

R. I. T Mechanical Engineering 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

R. I. T Mechanical Engineering Session Objectives Design process overview Problem statement Voice of the Customer Voice of the Engineer Generate and Select Concept

R. I. T Mechanical Engineering 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!

R. I. T Mechanical Engineering Morphological Chart A tool that will allow you to assemble complete system ideas from your list of function concepts. More on this later…

R. I. T Mechanical Engineering Function AFunction BFunction CFunction D A1B1C1D1 A2B2C2D2 A3B3C3D3 A4B4C4D4 Functions Means

R. I. T Mechanical Engineering Design a Better Ladder These system concepts are ideas for better ladders.

R. I. T Mechanical Engineering Concept Selection Take 2 minutes and decide which concept is the best What was your team’s process?

R. I. T Mechanical Engineering 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!

R. I. T Mechanical Engineering 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.

R. I. T Mechanical 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

R. I. T Mechanical Engineering Questions?