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ENGINEERING DESIGN ENGINEERING DESIGN AND PRODUCTIONAND PRODUCTION

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What is design?What is design? To create something that has never been.To create something that has never been. To pull together something new or To pull together something new or

arrange existing things in a new way to arrange existing things in a new way to satisfy a recognized need of society.satisfy a recognized need of society.

Design establishes and defines solutions to problems not solved before, or new solutions to problems which have previously been solved in a different way.

A creative process which includes the synthesis of many subjects.A creative process which includes the synthesis of many subjects.

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What is design?What is design?

Design is a sequential process;Design is a sequential process;

● Exploring the alternative systems● Formulating a mathematical model

● Specifying specific parts

● Selecting a material

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DESIGN PROCESSDESIGN PROCESS

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1. RECOGNITION OF A NEED

2. DEFINITION OF THE PROBLEM

3. ANALYSIS AND FORMULATION OF THE PROBLEM

4. LITERATURE SURVEY

5. FEASIBILITY STUDY

6. PRELIMINARY DESIGN

7. DETAIL DESIGN

9. PRODUCTION PLANNING

8. EVALUATIONVIRTUALTESTING

TECHNIQUES

10. MANUFACTURING

PROTOTYPEBUILDING

AND TESTING

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1. Recognition of a need1. Recognition of a need

Needs usually arises Needs usually arises from dissatisfaction with from dissatisfaction with the existing situation.the existing situation.

> To reduce cost> To increase reliability or performance> To change

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2. Definition of the problem2. Definition of the problem

The definition of the The definition of the problem should include:problem should include:

> Problem statement

> Objectives and goals

> Definitions of technical terms> Constraints

> Evaluation criteria

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3. Analysis and formulation of 3. Analysis and formulation of the problemthe problem

To design something;To design something;

> Use the appropriate disciplines of science

> Choose the necessary tools> Simplify it through models

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4. Literature survey4. Literature survey

> Technical reports [ R&D ]> Company reports> Trade journals> Patents> Catalogs> Vendors’ Handbooks etc.

> Library> Internet

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5. Feasibility Study5. Feasibility Study

Evaluation of the solutions,Evaluation of the solutions,

> Physical realizability

> Economic worthwhileness> Financial feasibility

> Technological realizability

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6. Preliminary Design6. Preliminary Design

-Do not rush into detailed design !..

-After this step major changes become very expensive

-Final station to check;> Function> Strength> Design aesthetics

> Financial viability etc.

> Energy> Safety

- Divide the total system into functional blocks.

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7. Detailed 7. Detailed DesignDesign

> Materials> Manufacturing Processes> Business Decisions> Marketing & Service> Retirement & Life cycle

> Form & Dimensions> Tolerances & Surface Properties

> Improvement> Output: Computer Model & Tech. Drawings

For every functional block;For every functional block;

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8. Evaluation8. Evaluation> Virtual Testing Techniques

- CAD / CAM / CAE

> Prototype Building and Testing using laboratory facilities

- Ease, cheap, fast to revise

- Integration of computers into the design and production process

- Simulation, Animation, FEM Analysis

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9. Production Planning9. Production Planning

A great deal of detailed planning must be done.A great deal of detailed planning must be done.

> Sales and Operation Planning

> Long Term Planning

> Demand Management

> Materials Requirement Planning

> Customer Relations

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10. Manufacturing10. Manufacturing

That is the point where the rubber That is the point where the rubber meets the road !..meets the road !..

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ReferencesReferences

Dieter, George E.,Engineering Design, A Materials and Processing Dieter, George E.,Engineering Design, A Materials and Processing ApproachApproach

http://www.cetex.de/cetex/eng/ausstat.htm#gvhttp://www.cetex.de/cetex/eng/ausstat.htm#gv http://www.sapgenie.com/sapfunc/pp.htmhttp://www.sapgenie.com/sapfunc/pp.htm http://fire.nist.gov/bfrlpubs/buildall/key/key1904.htmlhttp://fire.nist.gov/bfrlpubs/buildall/key/key1904.html