Systems by Professor Vaughan Pomeroy · 1 Systems by Professor Vaughan Pomeroy The LRET Research...
Transcript of Systems by Professor Vaughan Pomeroy · 1 Systems by Professor Vaughan Pomeroy The LRET Research...
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1
Systems
by
Professor Vaughan Pomeroy
The LRET Research Collegium
Southampton, 16 July – 7 September 2012
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Systems
Professor Vaughan Pomeroy July 2012
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Icebreaker
• Think of a ‘system’ that you are familiar with
• What are the boundaries of the system?
• Who has an interest in the design of the system?
• Aim – to challenge your thought processes!
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Introduction to systems
engineering
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Origins
• Defence systems – integrated systems for fighter control
• Electronics – radar and navigation
– Systems reliability
– Reliability by design
• ‘Systems analysis’ invented by RAND 1956
• MIL Handbooks, Reliability Databanks, modelling methodologies, link to Quantitative Risk Assessment
• Systems thinking
• ISO 15288.2002 and .2008
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Air defence systems
• Introduction of longer range detection
• Coordination of data from detection sites
• Interpretation of data
• Information creation and reaction planning
• Civilian air raid warning
• Activation of fighter response
• Active in-flight vectoring to meet developing scenario
• Recall of responders
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Air defence systems
• Introduction of longer range detection
• Coordination of data from detection sites
• Interpretation of data
• Information creation and reaction planning
• Civilian air raid warning
• Activation of fighter response
• Active in-flight vectoring to meet developing scenario
• Recall of responders
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Systems engineering process methodology
• Need for formal process to ensure all tasks covered
• Multi-disciplinary aspects
• Encompasses all relevant engineering tools
• Aims to ensure that ‘the system’ that is delivered meets the needs of the customer and user, whilst satisfying the requirements of all relevant stakeholders
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Problem-solving sequence – hard systems
• Problem definition
• Choice of objectives
• Systems synthesis
• Systems analysis
• Systems selection
• System development
• Current engineering
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Problem-solving sequence – soft systems
• Problem situation – unstructured
• Problem situation – expressed
• Root definition of relevant systems
• Conceptual models
• Comparison of models with problem situation
• Determination of feasible, desirable changes
• Action to improve problem situation
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Systems map of the Universe
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Natural systems
Designed physical systems
Designed abstract systems
Human activity systems
Systems beyond
knowledge
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Summary
• Systems engineering methodologies have developed since 1940, initially in the defence sector
• Methodologies are closely related to safety and risk analysis
• Underlying processes exist to ensure that a robust approach is taken, including all stakeholders
• Recognition that systems engineering activities go beyond
– Initial design, build and setting to work
– Involve human activities
– Involve interactions with natural systems
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System boundaries
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System boundaries?
• Need to understand
– Context of use
– Interactions with wider systems
– Interfaces with other ‘sub-systems’
– Information exchanges
• Includes
– Operational environment
– Users
– Third parties
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External environment – ISO/IEC 15288
• Regulatory requirements
• Codes and standards, and other normative documents
• Natural constraints
• Technologies – availability, maturity
• Commercial position – competition, financial conditions, trade restrictions
• Risk – business, technical, legal, political
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Global environment
• Climate change – planet warming
• Discharges to air – carbon dioxide, SOx‘
NOx, particulates,
hydrocarbons
• Discharges to water and land – ballast water, grey water, solid waste
• Impact of maritime technology solutions on the environment
• Impact of the environment on maritime technology solutions
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Marine environment
• Impact of maritime operations on:
– Water
• Pollution
• Underwater noise
• Temperature, locally
– Seabed
• Disturbance due to wash, fishing, etc
• Disruption due to dredging, offshore structures, etc
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Vanishing sandy beaches
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Marine food chain
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Systems considerations
• Minimization of risk of damage to marine ecosystem
– Through permanent change
– Through intermittent change
• Development of solutions which recognize impacts
– On ecosystem and marine food chain
– On seabed
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Users
• Recognition that systems must be usable by averagely competent people
• Usability of interfaces
– Ergonomics
– Displays
– Information presentation
– Presentation of ‘context’
• Language and terminology to ensure clarity of meaning
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Users
• Recognition that systems must be usable by averagely competent people
• Usability of interfaces
• Presentation of key information for user decision-making
– Alarms
– Operating parameters
• Dependability – reflecting reliance by user on system
– May not be the intention of the designer
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The wider community
• Political factors – regional, national, local
• Regulatory regimes, including planning
• Accident preparedness – response arrangements
• Interaction with other users of marine environment
• Public perception of industry
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System boundaries - summary
• Without a clear understanding of where the boundaries are the system design will probably be incomplete
• The Systems Integrator should ensure that at each level the appropriate boundaries are defined and compatible with the next higher level
• The boundaries are case specific
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Systems engineering
processes
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Key terms • System
– Combination of interacting elements organized to achieve one or more stated purposes
• System – of – interest
– System whose life cycle is under consideration
• System Element
– A discrete part of a system
• Enabling System
– A system that complements a system of interest but does not necessarily contribute to its operational functioning
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Enterprise environment
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Project Management Processes
Agreement Processes
Technical Processes
Support Processes
Enterprise Processes
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Summary
• Processes are not a substitute for good engineering
• IT/software pedigree is a barrier to wider adoption, partly due to belief that the process bureaucracy is counter-productive
• Standards exist, including defence industry architecture frameworks
• Further work is ongoing to improve commonality of language and definitions
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Focus on requirements
definition
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Requirements definition
• Errors at this stage jeopardize project outcomes
• Rework and change during project execution are expensive
• Cost of rework and change increases exponentially as project moves along timeline
• Insufficient effort is often expended in early stages
• Assumptions are made about ‘user expectations’ which may not be valid
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Cost of correction
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Who has a view for a maritime project?
• Operator
• Owner
• User
• Maintainer
• Repairer
• Regulator
• Constructor
• Suppliers
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Architectural framework - maritime
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Viewpoints – what influences these?
• Experiences
– Individuals
– Organizations
– ‘race memory’
• Expectations
– Immediate exploitation prospect
– Future prospects
– End-of-life prospect
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• Try not to use more than four or five bullet points per page to avoid the page becoming too cluttered
• Keep each bullet point to one or two lines if possible
• Third bullet point
• Fourth bullet point
• Fifth bullet point
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Requirements definition
• Process of elicitation
– To extract input from all stakeholders
– To challenge to determine importance – must have, should have, might have, nice to have
• Process of consolidation
– To derive a common solution
• Process of validation
– To test the solution against the various viewpoints
– To identify significant conflicts and feed reassessment – if necessary
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Summary
• Key to successful outcome
• Without a clear and shared view of requirements
– No certainty that outcome will meet client expectations
– Cascade to lower tiers in supply chain is problematic
• With a clear view of requirements
– Translating requirements throughout supply chain is robust and consistent
– Validation and verification can be against clear and consistent criteria – relevant to a successful outcome
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Approaches to resolving issues
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Structured approaches
• Collate inputs
• Analyze
• Sort according to value to project
• Document decisions and rationale
• Monitor progress
• Revisit decisions where necessary – but maintain logical construction
• Archive for future use
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Brainstorming
• All ideas are potentially valuable
– Keep the ‘baby ideas’
– Solutions need imagination
• Need to collect all ideas, however unlikely
• Group ideas into similar insights
• Recognize that balance will be ‘participant specific’
• Remember – need to generate a shared vision based on several viewpoints
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Hazard identification
• Identifying potential hazards is essential to understanding risks
• Effectiveness is improved with right participants
• Operators and users have a lot to contribute
• Must go beyond accumulated experience
– Hazards should not be dismissed because no evidence of occurrence
– Elimination because ‘it shouldn’t happen’ is usually invalid
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These things do happen
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Concept of Operations
• What is the purpose of the asset?
• Who will use it?
• How will it be used?
• Where will it be used?
• How will the asset REALLY be used
– Change of operating area?
– Change of operational mode?
– Change of operators?
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Threat environment
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The way forward
• Think about the issues that have been discussed
• Seek out issues relevant to your role where Systems Engineering could be beneficial
• Test out the principles that have been presented, using the standards and methods
• Look beyond disciplinary boundaries and look for gains in performance – environmental, safety, commercial
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Icebreaker
• Think of a ‘system’ that you are familiar with
• What are the boundaries of the system?
• Who has an interest in the design of the system?
• Has your view changed? Yet??
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Professor Vaughan Pomeroy [email protected]