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ME1352 : DESIGN OF TRANSMISSION SYSTEMS

M.Puviyarasan, Senior Lecturer

Department of Mechanical Engineering

Panimalar Engineering College, Chennai

1Pec / DoME / MP / Design of Transmission Systems/Basics

by

DESIGN ‘Design' means different things to different people

a wallpaper pattern, a fashionable dress, the appearance of a racing car and so on.

Why we need to 'design', particularly in an engineering environment, and

How we might best go about 'designing'.

Pec / DoME / MP / Design of Transmission Systems/Basics 2

What is design ? The Concise Oxford Dictionary explains design as

'a mental plan, a scheme of attack, end in view, adaptation of means to ends, . . . preliminary sketch for picture, . . . invention.'

Evidently there is a lot more to design than mere visual aspects,

and design is not restricted to engineering.


What is design ? Cont…. Means to ends implies that we design not for the

abstract mental exercise, but with a definite goal in view - some action or some physical object (artefact) will result from the design.

Mental suggests that design is a thinking process.

When we design we deal primarily with ideas, with abstractions rather than with numbers - and computers for example cannot do the job for us, though they can help in certain tasks.

No matter what we design, it is vital that we develop and apply our imagination to visualise realistically the future form of the action, how it will eventually come into being and most importantly how it will thereafter interact with people and other actions.


What is design ? Cont…. Plan, scheme infers that design is distinct from

implementation. Designers especially in engineering seldom execute their plans, but rather communicate them to others - either by word of mouth, or visually (sketches, engineering drawings, computer simulations &c), or through the written word. Again, note the lack of emphasis on numbers

Invention means just that, we are coming up with something NEW - at least partly

Creativity is crucial


What is design ? Cont….So, can we now define design completely?

No ! and neither do we need to.

A rigid definition implies a rigid process, and design is anything but that. We shall adopt the following interpretation as it incorporates the above concepts and conveys a reasonably clear idea of what design is all about ……


Design is . . .

Design is the application of creativity to

planning the optimum solution of a given

problem and the communication of that

plan to others.

Any old solution will not do - we must strive for the optimum solution.


Why do we design ?

In a nutshell . . . . TO SURVIVE

There is a lot more to design than mere technical calculations.

An incomplete design which does not take everyone's viewpoint into consideration is a recipe for trouble.

It is the designer's responsibility to seek out these viewpoints

A solution must be close-to-optimum to start with, as retrospective fixes are never wholly satisfactory.


Design means ….

Survival = Good design = Creativity


Design means ….

Design is keeping everybody happy

If something can go wrong then it will

go wrong - and at the worst possible

time - Murphy's Law


How do we design ? state the problem

broadComplete

generate ideasConstraintscriteria

there are no half measures


How do we design ?

It is important to complete each activity,

over all the candidates, before starting

the next activity


Problem statement Understand the problem - communicate Avoid artificial constraints Broaden the problem Complete the problem Consider subdividing the problem Beware the 'improvement' brief

You must ask the right questions


Generation of ideas Avoid ALL criticism while creating Inherited qualities : we cannot all inherit Leonardo's genes, but read

on . . . . Method : you can employ proven techniques to increase your

inventive prowess Attitude : you must be positive, you can invent ! Knowledge : your understanding of how related problems are solved

can be increased Effort : Edison (inventor of the light bulb) was spot-on when he

observed that

'Invention is 1% inspiration and

99% perspiration'


Some Tips . . . Generate as many ideas as possible;

quality doesn't matter at this stage

Ensure that ALL constraints and

criteria are identified.

Keep it as simple as possible

Practicalisation is not mere criticism, it

is positive remedial action


Conclusions . . . Well, that's it ! You should now have the

fundamentals of designing under your belt. But recall that knowing the fundamentals of anything is pretty useless unless you can apply them advantageously.

Design is no different - you've got to practice application of the fundamentals, particularly when the problem doesn't seem to require any design process, rudimentary or otherwise.


the greater the load, the shorter the life . . .

Remember always that when you've got to

solve a real life problem, it's the

optimum solution

that you're looking for…


THANK YOU

20Pec / DoME / MP / Design of Transmission Systems/Basics

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