romdas elite survey vehicle with laser crack measurement system
DESCRIPTION
RIMS Forum - 20 March 2013 Paul Hunter - Data Collection LtdTRANSCRIPT
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Data Collection Ltd - ROMDAS Elite Survey Vehicle with LCMS
• Lane tracking for enhancing Roughness and Rut Depth repeatability
• Automatic Pavement defect detection for RAMM Condition Surveys
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DData Collection Ltd - ROMDAS Elite Survey Vehicle with LCMS
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DLCMS Principal of Operation
• Invisible high speed scanning laser fires at pavement surface
• Acquires full 4 m width profiles of a lane at normal traffic speed every 5 mm
• Capture in both full daylight or in night time conditions
• Automatic detection of a number of pavement defects
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DLCMS Data Output
The following data are output from the LCMS:• Roughness - IRI in two adjustable wheelpaths• Cracking –length, width, depth• Rutting-depth, width, cross-sectional area, type• Macro-Texture-MPD in 5 lines or bands across
the lane• Potholes – depth, area• Raveling Other Outputs:• JPEG imaging with Defect overlay• 3D imaging
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DFactors affecting Roughness Data Collection
Variation of roughness data may be explained by a number of issues such as
• Equipment related variation• Tracking – lateral wander – of vehicle during data
collection• Distance and equipment calibration error• Operator errors• Location referencing errors (both of roughness
data collection and defect records)
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DExample of the effects of Lane wander
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DExample of the effects of Lane wander
LWP IRI value for section3.44 IRI 90 NAASRA
LWP IRI value for section7.87 IRI207 NAASRA
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DLane Wander
Results depend on the trajectory of the vehicle (subject to variation based on driver’s ability)
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DLCMS Lane Tracking System
Classic system: Results depend on the trajectory of the vehicle (subject to variation based on driver’s ability)
LCMS system: Erratic trajectory of the vehicle will still result in straight elevation profiles, and the same profiles in subsequent surveys
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DPavemetrics Data for Effect of Lane Tracking
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DRut Depth Measurement with Scanning Laser
The accuracy of rutting measurements depends upon two operational factors:
• Vehicle position on the road (lateral placement); and,
• The ability to locate the high and low points in the profile measured.
Transfund report - Harmonising Automated Rut Depth Measurements
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DRAMM Condition Rating
• on a portion of the network not 100%. • rating can be somewhat subjective and
reliant on the interpretation of the inspector.
• safety aspects of having raters on the road or road edge.
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DCrack Image with Defect Overlay
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DPavemetrics Crack Detection Repeatability Data – Australia
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DRAMM Condition Rating Attributes able to be measured by LCMS
• Rutting• Shoving• Cracking – Alligator cracks• Cracking - Longitudinal / Transverse• Cracking - Joint Cracks• Potholes
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DROMDAS Elite with LCMS System
• By using the Lane tracking technology all datasets are unaffected by the vehicle wander during survey.
• Great potential to use the automatic defect detection to supplement RAMM Condition rating surveys