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Condition Monitoring: Technology For Assessing Vehicle
And Track Performance
Matthew Dick, P.E.ENSCO RailJune 6th 2017
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SummaryWhat’s inside the technology?
Overview of measurement systems.
What is the future of measurement?
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Background on Sensors
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Distance/Location Measurement
Wheel Sensor
Tachometer(aka Wheel Encoder)
GPS AntennaDifferential CorrectionInertial Correction
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Accelerometers• Directly measure acceleration• Acceleration can be converted to Velocity, Distance, and Force
Piezoelectric Crystal
Mass
Voltage
Piezoelectric Accelerometer
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Accelerometers• Directly measure acceleration• Acceleration can be converted to Velocity, Distance, and Force
Piezoelectric Crystal
Mass
↑Voltage
Piezoelectric Accelerometer
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Accelerometers• Directly measure acceleration• Acceleration can be converted to Velocity, Distance, and Force
Piezoelectric Accelerometer
Piezoelectric Crystal
Mass
MEMS Accelerometer
Cantilever Beam
Mass
↑Voltage
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Accelerometers• Directly measure acceleration• Acceleration can be converted to Velocity, Distance, and Force
Piezoelectric Accelerometer
Piezoelectric Crystal
Mass
MEMS Accelerometer
Cantilever Beam
Mass
↑Voltage
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Accelerometers• Directly measure acceleration• Acceleration can be converted to Velocity, Distance, and Force
Piezoelectric Accelerometer
Piezoelectric Crystal
Mass
MEMS Accelerometer
Cantilever Beam
Mass
• Used for higher acceleration• Used for higher frequency vibration
• Used for lower acceleration• Used for lower frequency vibration• Can measure “DC Response”
↑Voltage
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Strain Gauges• Directly measures strain, which can be converted to stress.
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Strain Gauges• Directly measures strain, which can be converted to stress.
• Voltage change can be measured due to the strain gauge resistance change.
• There are various types and installation patterns of strain gauges.
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Temperature Sensors
Thermistors and RTDs Thermocouples Infrared Sensors
• Uses resistance change to measure temperature.
• Lower cost• Lower temperature
range
• Uses voltage change between dissimilar metals to measure temperature.
• Higher cost• Higher temperature
range
• Measures thermal radiation
• Non‐contact measurement
• Sensitive to surface conditions
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Ultrasonic Sensors• Can measure depth, size, and orientation of internal flaws in a material
Couplant
Material
Ultrasonic Transmitter/Receiver
Front Reflection
Back Reflection
DistanceDistance
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Ultrasonic Sensors• Can measure depth, size, and orientation of internal flaws in a material
Couplant
Material
Ultrasonic Transmitter/Receiver
Front Reflection
Back Reflection
DistanceDistance
Flaw
• Uses ultrasonic waves to reflect from surfaces and measure the “time of flight” to determine distance.
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Laser
CameraCamera Image
distance
Camera and laser are fixed relative to each other
Use location of laser in camera image to triangulate distance
Laser Triangulation Measurement
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Laser
CameraCamera Image
distance
Camera and laser are fixed relative to each other
Laser Triangulation Measurement
Use location of laser in camera image to triangulate distance
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Laser
CameraCamera Image
distance
Camera and laser are fixed relative to each other
Use location of laser in camera image to triangulate distance
Laser Triangulation Measurement
Use location of laser in camera image to triangulate distance
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Laser & Camera
Camera Images
Left Half Rail
Right Half Rail
Complete Rail
Processed Data Points
Ref 1
Laser Triangulation Measurement
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Laser Triangulation Measurement
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“Line Scan” Camerasaka “Slit Scan”
“Area Scan” Camerasaka “Full Frame”
Works like your standard cameraWorks like your document scanner
Cameras
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Cameras
Ref: http://www.physics.byu.edu/faculty/colton/courses/phy123‐fall12/warmups/jitt30a.html
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Cameras
Ref: https://www.ormsdirect.co.za/blog/2012/05/08/what‐is‐aperture‐desmond‐louw‐explains/
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Cameras
What is needed for a railroad application:
Ideally want large depth of field (small aperture) for maximum content in focus.
Want fast shutter speed to capture quickly moving objects.
Generally need lots of light.
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Line Scan Sensor Area Scan Sensor
Light is converted to electricity similar to a solar cell.
Imagery sensors are like a grid of very tiny solar cells.
Cameras
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Cameras
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Cameras
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Overview of Measurement Systems
There are five basic categories of measurement system.
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Categories of Measurement Systems1) Mounted on Vehicle to measure the Vehicle.
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Categories of Measurement Systems1) Mounted on Vehicle to measure the Vehicle.
System Accel Strain Temp Ultra‐sonic Laser Camera Other
Event Recorder Pressure, Throttle, etc
Locomotive Health Monitor Pressure, Fuel
Railcar Health Monitor
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Categories of Measurement Systems2) Mounted on Track to measure the Track.
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Categories of Measurement Systems2) Mounted on Track to measure the Track.
System Accel Strain Temp Ultra‐sonic Laser Camera Other
Rail Stress / Temp Monitor
Bridge Monitoring
Ballast & Formation Monitoring Displacement
Landslip Monitoring Displacement
Flood Monitoring Water
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Categories of Measurement Systems3) Mounted on Vehicle to measure the Track.(Manned, Unmanned, and Autonomous)
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Categories of Measurement Systems3) Mounted on Vehicle to measure the Track.(Manned, Unmanned, and Autonomous)
System Accel Strain Temp Ultra‐sonic Laser Camera Other
Track Geometry Measurement System
Rail Profile Measurement System
Ultrasonic Rail Flaw Detection
Ground Penetrating Radar Radar
Track Component, Joint Bar, & Rail Surface Machine Vision
V/TI Monitors
Corrugation Measurement
Clearance Measurement & 3D Scanning
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Categories of Measurement Systems4) Mounted on Track to measure the Vehicle.
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Categories of Measurement Systems4) Mounted on Track to measure the Vehicle.
System Accel Strain Temp Ultra‐sonic Laser Camera Other
Dragging Equipment Detectors Displacement
Hot Bearing & Hot/Cold Wheel Detectors
Wheel Impact Load Detectors & Truck Performance Detectors
Truck Condition Detector (TBOGI)
Acoustic Bearing Detectors Acoustic
Wheel Profile Detectors
Cracked Wheel Detectors
Machine Vision Systems
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Categories of Measurement Systems5) Mounted on Vehicle to measure the Vehicle & Track.
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Categories of Measurement Systems5) Mounted on Vehicle to measure the Vehicle & Track.
System Accel Strain Temp Ultra‐sonic Laser Camera Other
V/TI Monitors
Instrumented Wheelsets
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Detailed Discussion of Measurement Systems
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How does a Track Geometry Measurement System Work?
Inertial Package“Measures the beam location in three
dimensional space”
Laser/Cameras“Measures the relative positions between the rails and the beam”
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How does a truck condition monitor work?
Laser
Wayside Laser/Camera system measures profile of wheel plate.
Front Rim FaceImage from Standard Car and Truck Maintenance Manualhttp://www.sctco.com/pdf/Section1.pdf
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Images from Wayside Inspection Systemshttp://wid.ca/sites/default/files/brochures/TBOGI/WID_TBOGI_Brochure_US.pdf
How does a truck condition monitor work?
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Wheel Sensor
Example Camera Systems
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Example Camera Systems
Joint Bar View
Track Bed View
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Example Line Scan Images
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Example Line Scan Images
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Example Line Scan Images
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Example Line Scan Images
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Example Line Scan Images
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Track Measurement Vehicle MeasurementTruck Condition Monitor
(TBOGI)
Cracked Wheel Detector
Truck Performance Detector
Hot/Cold Wheel Detector
Wheel Profile Detector
Wheel Impact Load Detector
Machine Vision
Track Geometry Measurement
Ultrasonic Rail Flaw Detector
Instrumented Wheelset
Vehicle Mounted Rail Temperature Measurement
Rail Profile Measurement System
V/TI Monitor Axle Impact
Machine Vision
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What is the Future of Railway Measurement Technology?
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1) Ultra Comprehensive Track Inspection Vehicles
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Track GeometryRail ProfileCorrugationUltrasonic Rail FlawGround Penetrating Radar
Track Bed ImagingRail Surface ImagingDriver View ImagingBallast/Formation Profile
Roy Hill Mine 2015
9 Inspection Systems
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Track GeometryRail ProfileCorrugationClearanceOverhead Wire MeasurementDriver View ImagingTrack Component ImagingOverhead Wire Imaging
Queensland Rail 2017
8 Inspection Systems
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Track Geometry Measurement System (TGMS)Rail Profile Measurement System (RPMS)Joint Bar Inspection System (JBIS)Track Component Imaging System (TCIS)Driver View Imaging System (DVIS)Deployable Gage Restraint Measurement System (DGRMS)Loaded and Unloaded GageGrade Measurement
Canadian Pacific 2019
8 Inspection Systems
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Zero-Speed Track Geometry Measurement System (Z-TGMS)Rail Profile Measurement System (RPMS)Third Rail Measurement System (TRMS)Tunnel Clearance Measurement System (TCMS)Rail Corrugation Measurement System (RCMS)Driver View Imaging System (DVIS)Thermal Imaging System (TIS)Rail Surface Imaging System (RSIS)Tunnel Wall Imaging System (TWIS)Ultrasonic Rail Flaw
PATH 2018
10 Inspection Systems
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Zero-Speed Track Geometry Measurement System (Z-TGMS)Rail Profile Measurement System (RPMS)Third Rail Measurement System (TRMS)Tunnel Clearance Measurement System (TCMS)Rail Corrugation Measurement System (RCMS)Driver View Imaging System (DVIS)Overhead Wire Measurement System (OWMS)Deployable Gage Restraint Measurement System (DGRMS)Loaded and Unloaded GageSignal and Communication Inspection System (SCIS)Joint Bar Inspection System (JBIS)Track Component Imaging System (TCIS)
Metro North Railroad 2018
12 Inspection Systems
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2) Autonomous Track Inspection from Revenue Vehicles
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2) Autonomous Track Inspection
Metro North Railroad2016Three (3) Units
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Canadian Pacific – 2013
CSX – 2016
FRA – 2016
RUMO (Brazil) – 2017
2) Autonomous Track Inspection
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3) Field Inspections in the Office
• Increased safety
• Increased productivity and savings
• Additional increased savings from unmanned and autonomous systems on revenue vehicles
Virtual Track Walk Software
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4) Unmanned Aerial Systems (UAS)aka Unmanned Aerial Vehicles (UAV)
aka Drones(But don’t call them Drones)
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3) Unmanned Aerial Systems (UAS)
Multi‐Rotor Fixed Wing
• Good maneuverability• Relatively slow speed• Lower altitude• 20~40 minute flight time
• Good for flying long paths• Relatively fast speed• Higher altitude• Several hours flight time
Vertical Take‐Off and Landing (VTOL)
• Hybrid of multi‐rotor and fixed wing
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Questions?