DAME: A Distributed Diagnostics Environment for Maintenance Professor Jim Austin/Dr Tom Jackson University of York

Distributed Aircraft Maintenance Environment - DAMERR Grid Forum Meeting, September 12th Demonstrator Status Mid Term Demonstrator just completed –Grid Portal providing access to DAME Diagnostic Grid Services –Broad range of applications ported to Grid services, including RR engine models, commercial CBR tools, data mining technologies, and databases; –Built on Globus Toolkit 3 OGSA/OGSI model (DAME was an early adopter of GT3) –Fully deployed on White Rose Grid –Populated with data to support ‘Bird Strike’ diagnosis

Distributed Aircraft Maintenance Environment - DAMERR Grid Forum Meeting, September 12th Portal Environment The DAME portal provides hosting environment for all the diagnostic activity and data analysis, and also: –Manages issues of distributed diagnosis team and virtual organisations –Manages DAME automatic workflows and manual interaction with the diagnosis toolkit –Manages issues of security and user roles, based on GT3 security and certification (X509)

Distributed Aircraft Maintenance Environment - DAMERR Grid Forum Meeting, September 12th DAME Architectural Overview QUOTE Data-Mining Signal Processing Case Based Reasoning Novel Data R a w E n g i n e D a t a Vibration Shaft Speed Fuel Flow S e r v i c e D a t a P a r t s D a t a Grid Services Management Modelling/ Simulation O p e r a t i o n a l D a t a The Grid... AURA-G DAME Grid Portal

Distributed Aircraft Maintenance Environment - DAMERR Grid Forum Meeting, September 12th WRG Distribution

Distributed Aircraft Maintenance Environment - DAMERR Grid Forum Meeting, September 12th Fundamental work flow Three major stages to DAME: Take vibration data from all engines in flight –Detect events on that engine that look unusual –Search for similar events on other engines that are known about or not known about –Reason Using historical data that is associated with past similar events

Distributed Aircraft Maintenance Environment - DAMERR Grid Forum Meeting, September 12th Tools Detect: –Uses a QUOTE on wing statistical classifier system – Oxford University Search: –Uses AURA pattern matching methods to search large vibration data sets - York Reason: –Uses CBR tools based on existing technology –Uses Engine model –Uses signal processing system

Distributed Aircraft Maintenance Environment - DAMERR Grid Forum Meeting, September 12th Event detection Uses the Quote system Developed by Oxford University. Uses various methods to detect possible events on the engine. On wing system, highlighting where an incident may be.

Distributed Aircraft Maintenance Environment - DAMERR Grid Forum Meeting, September 12th Zmod data

Distributed Aircraft Maintenance Environment - DAMERR Grid Forum Meeting, September 12th Data Mining Services The AURA correlation matrix technology is used for rapid pattern matching –Rapid data mining is pivotal to DAME diagnosis process Provides capability for massively parallel search on vast datasets of ZMOD vibration data; Built on mature AURA technology, but now deployed as a Grid service.

Distributed Aircraft Maintenance Environment - DAMERR Grid Forum Meeting, September 12th The AURA system Data Data Adaptor Store Search Input pattern Candidate Engine (Back check) Indexer Output pattern AURA SearchEngine Results binary Store & Search Indexes or Data Res ult Stor e AURA Search Process

Distributed Aircraft Maintenance Environment - DAMERR Grid Forum Meeting, September 12th Data Mining Services, cont Interactive front end developed for AURA search engine –Allows direct search on raw vibration features; AURA-G is a two-tier architecture. –First tier hosts a generic AURA service –Second tier containing application specific code Clients interact directly with the second tier, allowing application developers to abstract away from the pattern matching domain.

Distributed Aircraft Maintenance Environment - DAMERR Grid Forum Meeting, September 12th Case Based Reasoning CBR service is provided via a Grid service interface to a commercial CBR package (Orenge, by Empolis); A Service Factory supports the creation of multiple CBR instances – Permits many CBR processes to be executed in parallel from a single service access point CBR provides decision support for fault ranking and workflow advice; Knowledge Model Case Indexer Indexed casebase Fault and Maintenance Data CBR Process Managers CBR Broker Instance of CBR SERVICE Instance of CBR SERVICE Instance of CBR SERVICE Instance of CBR SERVICE Instance of CBR SERVICE Indexed casebase CBR Service Factory

Distributed Aircraft Maintenance Environment - DAMERR Grid Forum Meeting, September 12th Engine Model Service RR thermo-dynamic engine performance simulation deployed as a Grid service, through interactive JAVA application. Provides simulation of different flight operational conditions and requirements, e.g. Idle, Take-off, Climb The Factory Service can generate a group of engine simulation instances for different client requirements. Both Transport Level and Message Level Security are implemented to protect the secure sensitive engine model and user data.

Distributed Aircraft Maintenance Environment - DAMERR Grid Forum Meeting, September 12th Signal Processing Services Grid based deployment of the vibration analysis algorithms. Provides: –Opportunity for finer grain analysis; –More powerful algorithms; –Testing environment for development of new algorithms;

Distributed Aircraft Maintenance Environment - DAMERR Grid Forum Meeting, September 12th Workflow Engine Workflow Engine provides management of manual and automated workflows. Also handles certification and role management Browser Portal Workflow Manager Role Database MyProxy Server XTOCBR Broker Aura-G Event Generator Workflow Credential Engine Data Store Engine Model SDM to XTO

Distributed Aircraft Maintenance Environment - DAMERR Grid Forum Meeting, September 12th Brokering and SLA’s Brokerage system is used for job allocation on available Grid resource Due to commercial application domain, broker should also demonstrate capability to manage QoS issues, and specifically Service Level Agreements (SLA’s)

Distributed Aircraft Maintenance Environment - DAMERR Grid Forum Meeting, September 12th Brokering and SLA’s, cont Use an SLA negotiation meta- service to negotiate SLAs Use a monitoring service – policing mechanism Integrate with GGF Grid Economic Architecture

Distributed Aircraft Maintenance Environment - DAMERR Grid Forum Meeting, September 12th Dependability Issues Contribute to the GRID community dependability and security studies, where possible. Provide dependability and security analysis to support the ultimate deployment of DAME as a working engine diagnosis environment. If possible, provide a basis (identify good practices) for dependability and security analysis for the deployment of DAME as a working diagnosis environment for other domains e.g. medical. Dependability analysis has meant need for business process analysis, asset identification, risk identification.

Distributed Aircraft Maintenance Environment - DAMERR Grid Forum Meeting, September 12th Dependability Issues, cont

Distributed Aircraft Maintenance Environment - DAMERR Grid Forum Meeting, September 12th GT3 Experiences Transition from web services to OGSA grid services reasonably straight forward; However, poor documentation and technical support in early GT3 releases; Fairly substantial changes in OGSA/OGSI spec between releases (e.g. registry definitions);

Demonstrator Detail Dr. Tom Jackson

Distributed Aircraft Maintenance Environment - DAMERR Grid Forum Meeting, September 12th Demonstrator Detail Portal provides role based access to diagnostic data and tools Maintenance EngineerMaintenance Analyst

Distributed Aircraft Maintenance Environment - DAMERR Grid Forum Meeting, September 12th Automatic Workflow Arrival of QUOTE data with ‘Novelty’ initiates an automatic workflow in DAME Attempt to match current fault conditions with historic data for initial diagnosis Four stages to automatic workflow –Assessment of data with ground based feature analysis service (XTO) –Aura-G pattern match ‘find one similar’ –Search of Service Data Manager for fault records –Ranking of recovered data into fault hypothesis list Diagnosis available to ME and to MA

Distributed Aircraft Maintenance Environment - DAMERR Grid Forum Meeting, September 12th Maintenance Analyst Work list of escalated engines Can work on multiple engines simultaneously

Distributed Aircraft Maintenance Environment - DAMERR Grid Forum Meeting, September 12th Toolset available MA has access to following toolset: –CBR Analysis –Feature Detection Algorithms –Engine Model Service –Data search and visualisation MA aided by CBR decision support service (work flow advice)

Distributed Aircraft Maintenance Environment - DAMERR Grid Forum Meeting, September 12th Toolbench, cont Portal

Distributed Aircraft Maintenance Environment - DAMERR Grid Forum Meeting, September 12th Future Work Development of work-flow manager in the portal, for flexible workflow configuration; Further analysis of dependability properties, including detailed studies on timeliness properties and security issues; Larger scale database deployment, and possible OGSA-DAI development; Further development of Grid monitoring services as basis for SLA and brokering; Continued development of data mining capability; Enhanced data visualisation and processing capability.

Distributed Aircraft Maintenance Environment - DAMERR Grid Forum Meeting, September 12th Thanks… The development team: Further info: Jeff AllanBojian Liang Richard BagshawSarfraz Nadeem Vernon BaileyMax Ong Rob DavisAndy Pasley Martyn FletcherXiaoxu Ren Iain GourlayDuncan Russell Georges HonoreMartin Thompson John HodrienSimukai Utete Mark JessopJulian Young