Design methodologybasic ideas, aims, role, procedures

Design – what is this?Design – formulating a plan, a scheme or a method to translate a need into a satisfactorily functioning device that satisfies the need

Konstruowanie - projektowanie szczegółowe - dobieranie cech konstrukcyjnych, materiałowych, geometrycznych, dynamicznych projektowanej maszyny jej zespołów i podzespołów i elementów

Designing – what for?New products being developped (life-cycle of a product) direct order but more often planning Planning of product development

External impulses (incentives):law regulationsmarketeconomic policynew technology

And internal: within the firms

Importance of design process

What is defined in the design process? ........

... EVERYTHINGCost of design process is .......

... Small (almost negligible)

Importance of design process... but, interestingly…

Change in design methods

Conventional design process - linear, sequential „over the wall”

Change in design methods

„concurrent engineering”

Phases of design procedure

Problem formulating - precyzowanie zadaniaIt should be a designers’ task – why?

List of specifications – there are WISHES and REQUIREMENTS

hints : what is the problem?what are the wishes and expectations?are conditions realistic?

Problem solving:

•Formulate a problem,

•Define criteria,

•Seek solutions,

•evaluate/select,

•Carry out

Requirements

Requirements – cotradictions

Requirements

Requirements of the customers

General requirements• Functionality – ability to fulfil the function

• Durability and reliability -Durability – period of time in which a machine will perform its function (with necessary breaks for maintenance). Reliability is probability that a device will perform its function without a failure for a given period of time•Cheap and available materials•Easy and inexpensive manufacturing and assembly• Easy and safe operation •Inexpensive operation i small energy consumption•Small weight •Compact structure•Following the standards

Phases of design

• identification of important problems• creation• evaluation• decision

Phases of design process• identification of important problems • creation -

- analysis and dividing into sub functions- seeking solutions fulfiling sub-functions- combining sub functions to obtain solutions fulfilling function- choice of useful combinations- defining variants of solutions

Phases of design procedure

• preliminary calculations, sketches of variants (versions), study

Aids in creation:•heuristic methods (?)

EUREKA•literature•Analysis of natural systems •Analysis of other systems•Analogies

Inversion

Evaluation

•criteria

•Weighted marks

Evaluation

•criteria

•Simplified binary evaluation