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8/3/2019 8. Axiomatic Design - ANUDEEP
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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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