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# Engineering Design Curriculum - PowerPoint PPT Presentation

Engineering Design Curriculum. Course Objectives. Apply the engineering design process Define a problem (need) and develop alternatives for solving Build, test, evaluate prototypes Create and use engineering drawings Demonstrate drafting techniques. Engineering design is….

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### Engineering Design Curriculum

• Apply the engineering design process

• Define a problem (need) and develop alternatives for solving

• Build, test, evaluate prototypes

• Create and use engineering drawings

• Demonstrate drafting techniques

• the process of devising a system, component or process to meet needs

• a decision-making process in which science and mathematics are applied to convert resources to meet objectives

• establishing objectives & criteria, synthesis, analysis, construction, testing, and evaluation

Problem statement incomplete, ambiguous

Solutions neither unique nor compact

Solution needs integration of many specialties

Science Problem

Succinct problem statement

Identifiable closure

Unique solution

Problem defined and solved with specialized knowledge

Problem Characteristics

“Design a system for lifting and moving loads of up to 5000 lb in a manufacturing facility. The facility has an unobstructed span of 50 ft. The lifting system should be inexpensive and satisfy all relevant safety standards.”

• Develop student creativity

• Use open-ended problems

• Use design theory and methods

• Formulate design problem statements and specifications

• Consider alternative solutions

• Consider feasibility

• Know and apply production processes

• Understand concurrent engineering design

• Create detailed system descriptions

• Include realistic constraints such as…

• Economic factors, safety, reliability

• aesthetics, ethics, social impacts

• Place ethics and morals above all else

• Are team players

• Follow a deterministic design process

• Document their work

• Never stop learning

Module Organization: The Design Process

• Identify a need, who is the “customer”

• Establish design criteria and constraints

• Evaluate alternatives (systems or components)

• Build a prototype

• Test/evaluate prototype against criteria

• Analyze, “tweak” (), redesign (), retest

• Document specifications, drawings to build

Engineering Design ProcessBackup Chart

• Identify a need

• Establish design criteria and constraints

• Evaluate alternatives

• Build prototype

• Test/evaluate against design criteria

• Analyze, redesign, retest

• Communicate the design

During the idea phase encourage a wide variety of solutions through brainstorming, literature search, and talking to users

Best solutions are selected for further refinement

Models or prototypes are made and problems that arise may require new ideas to solve and a return to an earlier stage in the process

Finally drawings are released to manufacturing for production

Design is an Iterative Process

The crux of the design process is creating a satisfactory solution to a needHarrisberger

Problem Definition/ system

Specifications

Data & Information

Collection

Development of

Alternative Designs

Evaluation of Designs/

Selection of Optimal Design

Implementation of

Optimal Design

Engineering Design Process

Customer Need

or Opportunity

Source: Accrediting Board For Engineering and Technology

Primary Design Features system

• Meets a need, has a “customer”

• Design criteria and constraints

• Evaluate alternatives (systems or components)

• Build prototype (figuratively)

• Test/evaluate against test plans (criteria)

• Analyze, “tweak” (), redesign (), retest

• Project book: record, analyses, decisions, specs

Step 1: Need system

• Have a need, have a customer

• External vs internal; Implied vs explicit

• Often stated as functional requirement

• Often stated as bigger, cheaper, faster, lighter

• Boilerplate purpose: The design and construction of a (better____something)_____ for (kids, manufacturing, medicine) to do __________.

“Design criteria are requirements you specify for your design that will be used to make decisions about how to build the product”

Aesthetics

Geometry

Physical Features

Performance

Inputs-Outputs

Use Environment

Usability

Reliability

Some Design Constraints system

• Cost

• Time

• Knowledge

• Legal, ethical

• Physical: size, weight, power, durability

• Natural, topography, climate, resources

• Company practices

Activity/Demonstration system

• Product index cards

• Pair up as customer-designer

• Variation on 20 questions

• Identify some design criteria and constraints for sample products

• Discuss

• Needs best stated as function, not form

• Likely to find good alternatives for cheapest, fastest, lightest, and encourage discovery

• Research should reveal what has been done

• Improve on what has been done

• Play alternatives off criteria and constraints

• Brainstorming helps

Simulation system

Best Design system

• Choose best design that meets criteria

• Demonstrate tradeoff analyses (among criteria and constraints) are high quality

• Cost (lifecycle) is always consideration

• Resist overbuilding; drives complexity, cost, time, resources

A quality design meets customers expectations!

Step 4: Prototype system

• Prototype is implementation of chosen design alternative

• It is a proof of design, production and suitability

• Prototypes are often cost prohibitive: Models and simulations may suffice

• Quality design does not include redesigning a lot of prototypes

Prototype system

Prototype

picture of 747

Step 5: Test it Well system

• Test and optimize design against constraints and customer expectations.

• Create a test plan showing how to test

• Test in the conditions of use

• Good test plan shows what test, expected results how to test, and what analyses will be. It relates to specification requirements

• e.g. test plan for light bulb (activity)

Production assembly-time-demonstration

Robustness-vibration, temperature-test article

Life-hours-statistical sample

Duty cycle-count on/off-prototype

Brightness-lumens-measure

Packaging-drop test-do last

Base fit-yes/no-first article demo

Test Results system

Successful Test:Satisfying

Test Failure:Priceless

Step 7: Documentation system

• Project data book

A complete record

All key decisions

Good drawings

Test plans

Results

Conclusions

Things learned

Draw a Good Picture system

• Drawings for project notebook, application, display

• Photos, sketches, CAD 2-D or 3-D

• Show assembly, components, materials