TRAINS – Railway Vehicle and TRACK System Integration the MANCHESTER METROPOLITAN UNIVERSITY TRAINS – Railway Vehicle and TRACK System Integration the MANCHESTER METROPOLITAN UNIVERSITY System Models to Assess the Impact of Change The IEE Railway System Modelling – Not Just for Fun Seminar Thursday 30 th September 2004 Clive Roberts Lecturer in Railway Systems University of Birmingham [email protected]www.eee.bham.ac.uk/robertc
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TRAINS – Railway Vehicle and TRACK System Integrationthe
MANCHESTER METROPOLITAN
UNIVERSITY
TRAINS – Railway Vehicle and TRACK System Integrationthe
MANCHESTER METROPOLITAN
UNIVERSITY
System Models to Assess the Impact of Change
The IEE Railway System Modelling – Not Just for Fun SeminarThursday 30th September 2004
TRAINS – Railway Vehicle and TRACK System Integrationthe
MANCHESTER METROPOLITAN
UNIVERSITY
Project Motivation• Many problems span several engineering
disciplines and can only be effectively tackled by understanding the system as a whole
• Systems engineering together with conceptual systems modelling allows problems to be investigated more effectively
• In particular the rail industry needs a means of investigating the effects of changes on the whole system, not just within individual subsystems or components
TRAINS – Railway Vehicle and TRACK System Integrationthe
MANCHESTER METROPOLITAN
UNIVERSITY
Systems Engineering Process
TRAINS – Railway Vehicle and TRACK System Integrationthe
MANCHESTER METROPOLITAN
UNIVERSITY
Project Work Packages• Requirements Elicitation – to understand what is
required• System Modelling – to map the relationships and
interconnections between components• Compositional Modelling – to build new models
from model fragments and infer knowledge• TOOLS Database – to provide details of existing
task specific tools and the links between them• Decision Support System
TRAINS – Railway Vehicle and TRACK System Integrationthe
MANCHESTER METROPOLITAN
UNIVERSITY
Requirements Elicitation
• Initial part of the Systems Engineering process• Decomposition of the problem in order to further
understanding• Identify stakeholder and system level
TRAINS – Railway Vehicle and TRACK System Integrationthe
MANCHESTER METROPOLITAN
UNIVERSITY
Scenarios
• Model Identification (identification)– To provide the user with models/tools that may
aid with a particular problem
TOOLSDatabase
Keywords(e.g. grinding)
Relevant tools anddetails
TRAINS – Railway Vehicle and TRACK System Integrationthe
MANCHESTER METROPOLITAN
UNIVERSITY
Scenarios
• Model Identification (data flow)– To provide a series of models/tools which when
joined together may solve a particular problem
TOOLSDatabase
Input/OutputKeyworks
(e.g. grinding/renewal)
Chain set ofmodelling toolslinking input to
output
TRAINS – Railway Vehicle and TRACK System Integrationthe
MANCHESTER METROPOLITAN
UNIVERSITY
Scenarios
• Document Database– To provide the user with information relating to
all aspects of a particular component / process
DocumentationDatabase
Keywords(e.g. grinding)
Relevantdocumentationand references
TRAINS – Railway Vehicle and TRACK System Integrationthe
MANCHESTER METROPOLITAN
UNIVERSITY
Scenarios
• Expert Identification– Provide details of experts in a particular field
WWWExpertDatabase
Specificquestionsfrom user
TRAINS – Railway Vehicle and TRACK System Integrationthe
MANCHESTER METROPOLITAN
UNIVERSITY
• Forms the foundations of the decision support system knowledge base
• Hierarchical relationship model to show simple interactions between physical components (elements)
• Model elicited from domain experts• Provides a means of communicating about the
domain under consideration
System Modelling
TRAINS – Railway Vehicle and TRACK System Integrationthe
MANCHESTER METROPOLITAN
UNIVERSITY
System Modelling
Power
Environment
1. VEHICLE
2. INFRA-STRUCTURE
Mechanical Interface
Power/Signals
Passenger Use
Environment
Power/Signals
Power on Board
HumanFactors
Training
Human Factors
Human Factors
TRAINS – Railway Vehicle and TRACK System Integrationthe
MANCHESTER METROPOLITAN
UNIVERSITY
System Modelling Environment
2.2SIGNALLING
2.1 TRACKSYSTEM (incsubstructures)
2.3 POWERSUPPLY
(XFORMER)
2.4STATIONS
2.5STRUCTURES
Track Circuit Signal
Power/Signals
MechanicalInterface to
Vehicle
Current Return
Power
Track Force
Data(Train Position)
Xformer power
TRAINS – Railway Vehicle and TRACK System Integrationthe
MANCHESTER METROPOLITAN
UNIVERSITY
Compositional Model• The core of the decision support system engine• Builds on the simple foundation of the hierarchical
system relationship model• Captures the systemic knowledge in an organised
way• System knowledge is represented in logical sets• Software algorithms are linked to model
fragments in order to compose a scenario model for a given scenario
TRAINS – Railway Vehicle and TRACK System Integrationthe
MANCHESTER METROPOLITAN
UNIVERSITY
Compositional Model
Element Relationship Name Element
Dependent Variables
Decision Variables
Physical PropertiesPhysical Properties
Logical Model Assertions
Rules/Assumptions
Dependent Variables
Decision Variables
TRAINS – Railway Vehicle and TRACK System Integrationthe
MANCHESTER METROPOLITAN
UNIVERSITY
Compositional Modelling Terminology
• Decision Variables - elements that change the model depending on the decision that is made by the user
• Physical Properties- properties that relate to the physical arrangement of the model element
• Dependent Variables - elements that are only relevant when some interaction occurs in the relationship. They can form limiting parameters for behaviour i.e. if X>Y then Z.
TRAINS – Railway Vehicle and TRACK System Integrationthe
Wheel profile type {new, worn,hollow worn}Axle typeBraking positionTraction and brakingperformanceTraction typeTurning IntervalInspection frequencyBrake typeQuality of maintenance
Rail type {S&C, Curvature, Straight,Transitional}Tamping intervalGrinding intervalQuality of maintenanceRail profile type (manufacturer and year)Inspection frequencyStandards/intervention level (permissible variation)light rail, heavy railrail inclination
TRAINS – Railway Vehicle and TRACK System Integrationthe
MANCHESTER METROPOLITAN
UNIVERSITY
Tools used in the Railway SystemTools used in the Railway System
InfrastructureInfrastructure VehicleVehicle
V - IInteraction
V - IInteraction WheelWheel
W – R Interaction
W – R Interaction
RailRail
SubstructureSubstructure ManagementManagement
EnvironmentEnvironment
TRAINS – Railway Vehicle and TRACK System Integrationthe
MANCHESTER METROPOLITAN
UNIVERSITY
TOOLS Database
TRAINS – Railway Vehicle and TRACK System Integrationthe
MANCHESTER METROPOLITAN
UNIVERSITY
VAMPIRE : Vehicle Dynamics Simulation Package
VAMPIREVAMPIRE
IntroductionIntroduction
TRAINS – Railway Vehicle and TRACK System Integrationthe