DAME: A Distributed Diagnostics Environment for Maintenance

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DAME A Distributed Diagnostics Environment for
Maintenance

• Duncan Russell
• University of Leeds

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Project Partners

• EPSRC Funded, 3 years, 3.2 million. Ends Dec 04
• 4 Universities
• University of Leeds, School of Computing and
  School of Mechanical Engineering
• University of Oxford, Dept of Engineering Science
• University of Sheffield, Dept of Automatic
  Control and Systems Engineering
• University of York, Dept of Computer Science
• Industrial Partners
• Rolls-Royce
• Data Systems and Solutions
• Cybula Ltd

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Operational Scenario
Engine flight data
London Airport
Airline office
New York Airport
Grid
Diagnostics Centre
Maintenance Centre
American data center
European data center
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DAME Grid Challenges

• Building a demonstration system to demonstrate
  proof of concept for Grid technology in the
  aerospace diagnostic domain
• Two primary Grid challenges
• Management of large, distributed and
  heterogeneous data repositories
• Remote, secure access to diagnostics tools,
  flight data and other operational data
• Other key issues
• Rapid data mining and analysis of fault data
• York AURA technology is critical component for
  data mining activity
• Management of distributed users and resources
• 24/7 operation QoS issues

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DAME Architectural Overview
DAME Diagnostics
Portal
...
Case Based
Modelling/
Decision
QUOTE
Support
Reasoning
Grid Services Management
Simulation
Novel
Data
The Grid
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AURA
Vibration
Shaft Speed
Fuel Flow
Software
Cluster
Hardware
AURA
AURA
AURA
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WRG Distribution
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Complex Virtual Organisation
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Specifying Workflow
Workflow instances are specified through UML
sequence diagrams.
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Specifying Workflow
Business workflows as Activity Diagrams
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Workflow Requirements

• Diagnostic Workflows
• Automatic initiated by novel event being
  detected
• Manual launched by engineer through diagnosis
  workbench
• Manage provenance data for diagnosis cases
• Management of secure services
• Role management
• Certificate handling
• Business Workflows
• Job Assignment and Tracking

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Workflow System

• Components for the workflow system have been
  identified
• Workflow Manager runs workflow instantiations
• Workflow Generator creates and manages workflows
  
• Workflow Advisor advisory system providing
  domain knowledge on how to deploy workflows

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DAME Services Workflow Architecture
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Current Progress

• Workflow Manager has been implemented
• Workflows captured as Java classes
• Workflow enactment via apache server hosted at
  the DAME portal
• Workflow Manager handles secure authorisation
  through management of X509 certificates

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Workflow Implementation
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Workflow Implementation
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Future Work

• Workflow Generator
• Dynamic Workflow Generation
• Means to edit/adapt workflows
• Means to visualise workflows
• Would like to adopt existing e-Science technology
• Development of Workflow Advisor
• Case Based Reasoning system
• Uses workflow provenance to build diagnosis case
  histories and capture domain knowledge
• Richer Security models
• Authorisation across computing domains
• Finer grain definition of role and access rights.
• Dynamic control of virtual organisations