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AXIOMATIC DESIGN

-Anudeep Bhimanapalli

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What is Axiomatic design?What is Axiomatic design?

y Axiomatic Design defines design as the

creation of synthesized solutions in the form

of products, processes or systems that satisfy

perceived needs through mapping between

Functional Requirements (FRs) andDesign Parameters (DPs).

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Design problems traditionally could

be said to come in two types:

y A. Developing candidate solutions for

accomplishing the design objectives

y B. Selecting between the candidate

solutions.

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y T hese two problem types can naturally bedecomposed, or broken down,Possibilityin a variety of ways.

y T he solutions to both types problem arehandled by the axiomatic design process.

y T he selection of candidate solutions requiresa certain kind of systematic description of the

problem that provides the proper context for

formulating candidate solutions.T his description and context are provided bythe domains and hierarchies of axiomaticdesign structures.

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Three steps are used inThree steps are used in

introducing axiomatic designintroducing axiomatic designy First is providing motivation, which isattempted by observing that design isfundamental to all engineering.

y Second is developing the concept that thereare two simple axioms, independence andinformation, that govern design, just as

Newtons laws govern mechanicsy T hird is observing that in order to apply the

axioms designs must be decomposed into a

hierarchical structure

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C ustomer domain

functionaldomain

physical

domain

process

domain

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Product design Process design

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In order for mapping to be satisfiedIn order for mapping to be satisfiedbetween domains, two axioms mustbetween domains, two axioms mustbe followedbe followed

y Ax iom 1: Th e Independence Ax iom

M aintain the Independence of the FRs

y Ax iom 2: Th e Information Ax iom

M inimize the Information C ontent of the

design

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y T he first of these refers to the need to create a

complete and non independent set of performance specifications.

y T he second indicates that the best design

solution will have the lowest information

content.

y Others have earlier referred to this second

idea as KISS,which stands,some what

crudely,for keep it simple,stupid

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Ax ioms

M aximum Independence M inimum Information

Structures

Design Domains

Design H ierarc h ies

Processes

Zigzagging decomposition P hy sical integration

Primary

E lements of Ax iomatic Design

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Ul timate Goa l of AxiomaticUl timate Goa l of AxiomaticDesignDesign

y T o establish a scientific basis for design

y T o improve designer activities

y T o make human designers more creativey T o reduce random search process

y T o minimize the iterative trial-and-error

process

y T o establish the best designs among those

proposed

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designers typically follow thesedesigners typically follow these

steps:steps:y U nderstand their customers' needsy Define the problem they must solve to

satisfy these needsy C reate and select a solutiony Analyze and optimize the proposed

solutiony C heck the resulting design against the

customers' needs

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