Geometry Measurement
description
Transcript of Geometry Measurement
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Geometry Measurement
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Gauge
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Cluster Camera Sensor
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Cluster Camera Sensor
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Cluster Camera Sensor
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Light Sectioning
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Laser/Camera Rail Sensor
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Light Sectioning
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Image Processor
V ide o Inpu t
S yncS eparator
V ideoD igitiz er
T im ing
V ide o M e m o ry
486 P C
V M E B U S
V G A /K e ybo ard
S hare dM e m o ry
A nalo g V ide o D ig itize d Im age R ail P ro file /M e asu re m e nts
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Calibration Target
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Calibration Image
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Geometry Measurement from Profiles
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Curvature
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Superelevation
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Simple Superelevation
Car and rail.pcx
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Not So Simple Superelevation
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Fully Compensated Superelevation
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Twist
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Chord Based Top
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Chord Based Top Problems
• Car body is the cord – body flex
• Distorts track signature
• Requires six rail sensor
• Cannot see certain faults
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Periodic Faults
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Space Curve Top
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Top - TrackLine
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Top – LR3K & UGMS
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Top Filtering – Why?
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Top Filtering
• Filtering limits response of long track features
• Solves the problem of signal noise
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Top Filtering
• Low speed track – short filters (10 – 30m)
• High speed track – long filters (50 – 120m)
• Butterworth, Bessel ?
• Linear phase response, sharper cutoff
• Your mileage may vary
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Simple Alignment
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Partially Compensated Alignment
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Fully Compensated Alignment
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Inertial Package
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Inertial Package Electronics
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Inertial System Block Diagram
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Laserail VME Chassis
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LR3K Data Flow Diagram
Im age P ro c e sso r
Im age P ro c e sso r
Im age P ro c e sso r
Im age P ro c e sso r
Im age P ro c e sso r
Im age P ro c e sso r
Im age P ro c e sso r
Im age P ro c e sso r
LT C 3 L as er C T R L
G eometry P roc es s or
C ollec ts all real- time dataP roduc es R A W data
rec ordsC alc ulates G E O M E T R Y
IO P roc es s or
S ys te m S ta rtupO pe ra to r In te rfa ce (V G A )
C o lle c ts fins ihe d da ta fro mG E O P ro c
N e two rk C o mmsD is k I/O (R A W , B IN , L O G )C a lib ra tio n / D ia gno s tics
C a me ra
C a me ra
C a me ra
C a me ra
C a me ra
C a me ra
C a me ra
C a me ra
V M E B us
T ac h
IM U
G P S S ync N et D is k
N e two rk
R S -232
R S -232
L as er
L as er
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Inside of Laserail Beam
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CP 63 GRMSGeometry Car Consist
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Box Car
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Unloaded Gauge
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Tube Laser
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CP 63 GRMSGeometry Car
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Laserail Beam
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CP 64Observation Area
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CP 64Operators Station
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CP 63Geometry Car Interior
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Inertial Package Mounting Detail
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Geometry Strip Chart
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Equipment Requirements
Reliability
• Reliability– High Reliability to achieve frequency of test
• No moving parts
• Withstands extreme shock
• Custom designed lasers / MTBF of 10,000 hours
• Hardened CCD cameras
• Complete recording season without corrective maintenance
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Laserail Camera on bogie
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Locomotive Installation
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Location Information
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• GPS– Low cost GPS receiver
• Accurate location information
• No differential GPS
• Determine switches and track features
• Accurate calibration of the tachometer
Location Information
GPS
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Location Information
Switch Detectors
• Switch Detectors– Determine the location of frogs in switches
• One detector on each rail
• Repeatable markers
• Switch direction indicated by Geometry
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Location Information
Tachometer
• Tachometer– Axle mount tachometer
• Calibrated in real-time