proactive decision support at the conceptual design synthesis of a product fayyaz rehman(phd...
TRANSCRIPT
Proactive Decision Support at the Conceptual Design Synthesis of a
Product
Fayyaz Rehman(PhD Student)
Dr. Xiu-Tian Yan(Supervisor)
CAD Centre, DMEM, University of Strathclyde,
Glasgow, UK
RPD2004
Introduction
ConceptualDesign
Previous WorkIn Function
Means Mapping
Design ContextKnowledge
PrototypeSystem
Proactive Decision Support at the Conceptual Design Synthesis of
a Product
Conclusions
• Conceptual DesignFunctional Design
• Review of Previous WorkDrawbacks
Research Aim
• Design Context Knowledge Description/Definitions
DCK based Mapping Model
• Prototype System
• Conclusions
Presentation Plan
Introduction
RPD2004
Introduction
ConceptualDesign
Previous WorkIn Function
Means Mapping
Design ContextKnowledge
PrototypeSystem
Proactive Decision Support at the Conceptual Design Synthesis of
a Product
Conclusions
Conceptual Design
Conceptual Design can be defined as the transition between four different information states
1. A set of required functions
2. A initial set of possible solutions/means to realize the function
3. A set of behaviours that fulfil the function
4. Final selected concept(s)/solution(s) that generate those behaviours
ConceptualDesign
RPD2004
Introduction
ConceptualDesign
Previous WorkIn Function
Means Mapping
Design ContextKnowledge
PrototypeSystem
Proactive Decision Support at the Conceptual Design Synthesis of
a Product
Conclusions
Conceptual Design
Functions, behaviour and form are major elements of information
ConceptualDesign
• Function reveals Intentions of Artefact Convert Motion Transmit Torque
• Form specifies what the artefact is composed of Components, Assembly/Sub-Assemblies Design, Geometrical and Manufacturing
Features
• Behaviour spells out how the structure of artefact achieves its function Frictional Force between belt & pulley Contact Force, Contact Pressure and
Rotational Speed at shaft-bore interface
RPD2004
Introduction
ConceptualDesign
Previous WorkIn Function
Means Mapping
Design ContextKnowledge
PrototypeSystem
Proactive Decision Support at the Conceptual Design Synthesis of
a Product
Conclusions
Conceptual DesignExample
ConceptualDesign
Function
Behaviour
Form
RPD2004
Introduction
ConceptualDesign
Previous WorkIn Function
Means Mapping
Design ContextKnowledge
PrototypeSystem
Proactive Decision Support at the Conceptual Design Synthesis of
a Product
Conclusions
Decision Making in Conceptual Design
ConceptualDesign
Each design decision cause consequences on the later life cycle phases (Manufacturing, Assembly, Use, Maintenance, Recycle/Dispose) of the product
RPD2004
Introduction
ConceptualDesign
Previous WorkIn Function
Means Mapping
Design ContextKnowledge
PrototypeSystem
Proactive Decision Support at the Conceptual Design Synthesis of
a Product
Conclusions
Review of Work in Function Means Mapping
Previous WorkIn Function
Means Mapping
Drawbacks of available Function-Means mapping methodologies and frameworks
Most of the work has been done from the perspective of functional requirements only- Requires methodology to bring down stream product life cycle information for consideration at conceptual design stage.
Emphasis was on the representation of energy flow, transformation & dissipation only – Less work has been done on other type of functions such as Assembly/Conveyance functions.
Domain dependant – Methodology is valid only for the area selected for implementation- Difficult to scale up domain knowledge representation
RPD2004
Introduction
ConceptualDesign
Previous WorkIn Function
Means Mapping
Design ContextKnowledge
PrototypeSystem
Proactive Decision Support at the Conceptual Design Synthesis of
a Product
Conclusions
Research Aim
Previous WorkIn Function
Means Mapping
Develop a computational framework to support decision making at the conceptual design synthesis of a product:
Developing a methodology to incorporate the consideration of design solution consequences at conceptual design stage
Establishing relationship between functional requirements of product and design context knowledge
RPD2004
Introduction
ConceptualDesign
Previous WorkIn Function
Means Mapping
Design ContextKnowledge
PrototypeSystem
Proactive Decision Support at the Conceptual Design Synthesis of
a Product
Conclusions
Design Context Knowledge
Definition of Context: • ‘Context’ is the set of facts or circumstances that surround
a situation or event (Charlton & Wallace 2000)
• Design Context is the information not necessary for the representation of the product itself, has an impact of the process of designing and subsequently on artefact (Brezillon and Cavalcanti 1997)
• Design Context is “Related background information of the a design problem under consideration”.Design Context Information can
include:
Life Cycle Issue(s), goal(s) or requirement(s)
User Information (Specific age group/gender/product preference)
Partial Solution Information in current working knowledge generated
up till current stage of design process
The physical surroundings with which the product can interact
Design ContextKnowledge
RPD2004
Introduction
ConceptualDesign
Previous WorkIn Function
Means Mapping
Design ContextKnowledge
PrototypeSystem
Proactive Decision Support at the Conceptual Design Synthesis of
a Product
Conclusions
Design Context Knowledge Based Function Means
Mapping Model
Design ContextKnowledge
Functional Requirements
Initial Generated Function Means
Identification of the Means to map
the intended function
A Dictionary of proven function-
Means association
Identification of the context of
design problem
Multi Perspective Product Current working model
Design Context Knowledge Base
Function Reasoning using Design
Context KnowledgeGeneration of ContextKnowledge Consequences
Selection of best alternative using decision theory
Decision Making theory
(AHP) rules
Designer’s preference (%age
weighting) to selection criteria
Selection of best alternative as alternative solution
Reduced Means
FunctionMeans Mapping
Completed
END
RPD2004
Introduction
ConceptualDesign
Previous WorkIn Function
Means Mapping
Design ContextKnowledge
PrototypeSystem
Proactive Decision Support at the Conceptual Design Synthesis of
a Product
Conclusions
PrototypeSystem
Prototype System (PROCONDES)Case Study
“PROVIDE ASSEMBLY FUNCTION
Assemble Semi-Permanently Assemble Permanently
(Slot-Fit) (Bolting) (Lance-Fit) (Wrapping) (Soldering)
Assembly of Base and Strip in Computer Power Unit
RPD2004
Introduction
ConceptualDesign
Previous WorkIn Function
Means Mapping
Design ContextKnowledge
PrototypeSystem
Proactive Decision Support at the Conceptual Design Synthesis of
a Product
Conclusions
PrototypeSystem
Prototype System (PROCONDES)Screen Shot 1
RPD2004
Introduction
ConceptualDesign
Previous WorkIn Function
Means Mapping
Design ContextKnowledge
PrototypeSystem
Proactive Decision Support at the Conceptual Design Synthesis of
a Product
Conclusions
PrototypeSystem
Prototype System (PROCONDES)Screen Shot 2
RPD2004
Introduction
ConceptualDesign
Previous WorkIn Function
Means Mapping
Design ContextKnowledge
PrototypeSystem
Proactive Decision Support at the Conceptual Design Synthesis of
a Product
Conclusions
PrototypeSystem
Prototype System (PROCONDES)Screen Shot 3
RPD2004
Introduction
ConceptualDesign
Previous WorkIn Function
Means Mapping
Design ContextKnowledge
PrototypeSystem
Proactive Decision Support at the Conceptual Design Synthesis of
a Product
Conclusions
PrototypeSystem
Prototype System (PROCONDES)Screen Shot 4
RPD2004
Introduction
ConceptualDesign
Previous WorkIn Function
Means Mapping
Design ContextKnowledge
PrototypeSystem
Proactive Decision Support at the Conceptual Design Synthesis of
a Product
Conclusions
PrototypeSystem
Prototype System (PROCONDES)Screen Shot 5
RPD2004
Introduction
ConceptualDesign
Previous WorkIn Function
Means Mapping
Design ContextKnowledge
PrototypeSystem
Proactive Decision Support at the Conceptual Design Synthesis of
a Product
ConclusionsConclusions
Conclusions
This research proposes a framework for proactively supporting decision making at conceptual design synthesis through the use of Design Context Knowledge.
Incorporating downstream Design Context Consequences information at conceptual/functional design stage could provide designer an opportunity to explore more design alternatives and avoid un-intended problematic consequences.
This approach would reduce the chances of re-design and subsequently time and cost which would be incurred in case of selecting a solution having un-intended problematic consequences.
RPD2004
Introduction
ConceptualDesign
Previous WorkIn Function
Means Mapping
Design ContextKnowledge
PrototypeSystem
Proactive Decision Support at the Conceptual Design Synthesis of
a Product
Conclusions
Thank-You&
Any Questions?