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Design--a multiparameter problem

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Design--a multiparameter problem. Function. Does it work? How reliably? Over what conditions does it work? Practicality, ease of use i) the flashing 12:00 on a VCR ii) a recipe that calls for 25 ingredients iii) a remote-controlled garage door. Cost

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slide1

Design--a multiparameter problem

Function

Does it work?

How reliably?

Over what conditions

does it work?

Practicality, ease of use

i) the flashing 12:00 on a VCR

ii) a recipe that calls for 25 ingredients

iii) a remote-controlled garage door

slide2

Cost

a) Market competitiveness

b) Return on investment

i) life of product

(software for DOS computers)

ii) fragility of product

liquid vs. tablet medicine

c) Manufacturability

i) single or multiple steps in the process

ii) multiple sub-assemblies

iii) existence of machinery

iv) expected market (quantity)

space shuttle toilet ~ 10

Pentium CPU ~ 10,000,000

d) Transportability

size, weight

slide3

Aesthetics

a) visual appeal

b) size, weight

i) small and light is good:

camcorders, cell phones

ii) big and heavy is good:

frypans, tools

iii) illusion

thin frypans made to look thick

plastic car grills made to look like metal

slide4

Quality control

a) Some failures OK

screws without threads

a mousetrap that doesn’t trip

a floppy disk that won’t format

b) Failures not OK

space-suits

pacemakers

c) “Zero defects”?

Electrodyne

pacemaker, 1958

slide5

Life Expectancy

a) single use

cameras

razors

British Seagull motors

b) outright failure

TV picture tube

c) designed to wear

brake pads

tires

d) “Lifetime”

artificial hip joint

slide6

Repair

a) Throwaway--plastic spoon, hand mixer

b) Fix vs. replace--appliances

c) Length of corporate responsibility--warranty, parts

d) Customer service

slide7

Safety

a) safety factor

i) percent over design

elevator cable

ii) statistical

average loading per square foot

“100 year” events

b) mode of failure

i) catastrophic--without warning

ii) indicator

steels that crack without failing

noise on worn automobile brakes

iii) gradual

growling of an old hand mixer

slide8

Packaging

a) size

b) protection during transport

c) assembled vs. non-assembled

d) completeness--”batteries not included”

slide9

Environmental

i) pollution during manufacture

ii) pollution during operation

iii) pollution during disposal

iv) biodegradation

Sheetrock: a

biproduct of

flue gas

desulfurization

slide10

Other

a) product certification--e.g., UL listing

b) Versatility

i) temperature, humidity, etc.

ii) foreign use--electricity requirements

slide11

Design:

It’s not a science; it’s an art.

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