Eng Design in Context

8/8/2019 Eng Design in Context

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11engineering design in contextengineering design in context

Engineering design in contextEngineering design in context

To progressTo progress

We have to make decisions.We have to make decisions.

General&

broad

DECISIONS

Detail

Higher level

bodies, eg.goverment

Lower level,

eg.

individuals

influences


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Decision depends on...Decision depends on...

DECISIONS

can be wrong.

Forecasts Criteria

have values.

cultural

individual


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From product proposal to a concrete product.From product proposal to a concrete product.

Product

proposal

a concrete

product

a new mountain bike

for leisure market.

ideas

a new tech. dev.

market need


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From product proposal to a concrete product.From product proposal to a concrete product.

a concrete

product

Design team

resources

-Finance

-Facilities

-Tools

-Info.

-to be completed

within the reqd. time.


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decisions made during design phase determines thedecisions made during design phase determines the

progress of the product meeting theprogress of the product meeting the needed criterianeeded criteria..

Product

proposal

a concrete

product

-economical to manufacture

-when in operation: safe

reliable

-recyclable


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decisions made during design phase requiredecisions made during design phase require

synthesis and modeling in forecasting.synthesis and modeling in forecasting.

forecasting Decision in Design

reliable/accurate

.

synthesis

modeling

-soln 1

-soln 2

-soln 3

seldom got it

right first time

make it right!


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DefinitionsDefinitions

Engineering

Design

Engineering

Manufacture

The process of converting an

idea/market need into detailedinformation from which a

product/system can be made.

The process of converting detailed

information into physical components

and assembling these into a

product/system.

idea

Detailed

info.

Detailed

info.

Physical

artifact


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Life of a productLife of a product

The fundamental stages in the life of a product;


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Model for Problem SolvingModel for Problem SolvingThe strategy in problem solving is to reduce the overall

complexity by splitting in smaller, manageable sub-problems


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Basis for decisionsBasis for decisions

All decisions are based;accuracy offorecasts made & quality of the

criteria used.

Design problems are open-ended.

no single unique solution

choose the best selection.

Solution chosen should be capable

of being realized.

can be embodied.simplicity

clarity


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ManagementManagementDesign management involves

the following;

Setting the objectives

Planning

Communicating the plans

Monitoring and controlling theexecution of the plans

Reviewing the outcome

BS7000Product development model

Senior management.

Project managers

Design managers


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Functional to Physical TransformationFunctional to Physical Transformation

The central activity of eng.design is the conversion of a set

oftechnical requirements into a

set ofmanufacturing

instructions.

The transformation

from

functional descriptions

of the proposed

product/system to

physical description


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Functional to Physical TransformationFunctional to Physical Transformation

Functionaldescription

Power transmission,

variable gear ratio,suspension, braking,

steering,

adequate strength,

easy maintenance.

e.g., A mountain bike to transport riderover rough terrain as comfortably and

safely as possible


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Structure of a technical system (product)Structure of a technical system (product)All technical systems can be modeled in terms of the flows and

conversions ofmaterials, energy, and information.


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Structure of a technical system (product)Structure of a technical system (product)All technical systems can be modeled in terms of the flows and

conversions ofmaterials, energy, and information.

Mountain bike

frame Handle bar gears brakes pedals

bearings spacers seals

Technical system

assemblies

Individual parts;

-standard

-made in-houseshape -> materials ->manufacture


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DESIGN PROCESSDESIGN PROCESS


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CLARIFICATION OF THE TASKCLARIFICATION OF THE TASK

A set of

requirementsand

constraints

Formulate a

poorly defined

problem

statement


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Requirements


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Example of a Design

Specification


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CONCEPTUAL DESIGNCONCEPTUAL DESIGN


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Functional identificationFunctional identification

Overall function


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Concept generationConcept generation


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Concept generationConcept generation

Eng Design in Context

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