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Chapter 3 : Concept Generation and Evaluation - Coggle Diagram
Chapter 3 : Concept Generation and Evaluation
Concept generation method
Generation and selection
Problem dicomposition
Explore for ideas
external to team
Internal to team brainstorming
explore systematically morphological chart
Evaluation
absolute criteria
Go/no go screening
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Intro
concept is an idea that sufficient develop to evaluate physical principle
can be represent by
verbal or textual description
sketches
paper or clay models
block diagram
any form to show the function that can be achieve
method to generate design concept
brainstorming
general usage in language to denote any kind of idea generation
idea should be generate by the group
idea that are feasible as they stand
six key question
who, what, when, why where, how
synectic
problems are solve by analogy
methodology or creativity base on reasoning by analogy that were first described in the book of gordon
type of analogy
direct, fantasy, personal, symbolic
biomimetric design
the mimicking of biological system
velcro fasteners
honeycomb structure
find idea in reference books and journal
using expert to help generate the concept
Problem solver characteristic
sensitivity
fluency
flexibility
originality
Concept map
good for generating and recording ideas during brainstorming
creativity technique for design
generate as many ideas as possible
goal becomes sorting out of infeasible ideas
team identifying smaller subset of idea that can be develop into practical solution
functional decomposition and synthesis
solving any complex task to decompose it into smaller unit that easier to work
decomposing must result the meaningfully represent original entity
mechanical design is recursive
Physical decomposition
functional representation
description
produce a diagram called a function structure
function structure is a block diagram with flow of energy, material and signal as labelled arrows take path between function block
function structure is a black box representation of a device
functional structure : mechanical pencil
functional synthesis strength
create function structure force representation into a language that is useful for manipulation of mechanical design problem
use a function structure to represent a design lends functional level to potential solution components
functional synthesis weakness
some products better suited to representation and design by functional decomposition and synthesis than other
Morphological methods
a method for representing and exploring all the relationships in multidimentional problems
word morphology means the study of shape and forms
morphological analysis is away of creating new forms
morphological steps
develop concept for each function
for each function ,list the means or methods to be used
draw up chart containing all possible sub solution
identify feasible combinations
Pugh's methods for Evaluation
generation and selection concept
selecting a design : requirements
a set of design selection criteria
a set of alternatives believed to satisfy the set of criteria
to evaluate the design alternatives with respect to each criterion
decision making : behavioral aspects
behavioral psychology provides an understanding of the influence of risk taking in individual and teams
making decision is a stressful situation for most people because we don't know about the information about the past or prediction of the future
challenges
Unconflicted adherence
unconflicted change
defensive avoidance
hypervigilance
vigilance
absolute criteria
design selection
evaluation base on judgment of functional feasibility of the design
concept
feasible
not feasible
will work
evaluation based on assessment of technology readliness
evaluation based on go/no go screening of the constraints and threshold levels of engineering characteristic
concept
method for identifying the most promising design concepts among the alternative generated at the Pugh chart
whether the concept in question is better than , poorer than , about the same as the reference concept
pugh chart is a relative comparison technique
Steps
choose criteria which the concept will be evaluated
formulate the decision matrix
3.clarify the design concept
4.choose the datum concept
5.complete the matrix entries
6.evaluate the ratings
7.establish a new datum and rerun the matrix
8.examine the selected concept for improvement opportunities
examples of Pugh chart
