Mobile Survey of Rail Track and Bed
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1 Mobile Survey of Rail Track and Bed DOT - FRA December 2, 2008 William J. Herr, MSEE, PE wherr@phnx-sci.com
2 Pavement Profile Scanner (PPS) Fast Accurate Available
3 Polygon Scanner Polygonal Scan Mirror 10,000 R.P.M x 6 sides = 1 Khz Scan rate = 1 inch between scans at 60 mph Collection optics Transmitter: Modulated Laser Detector 90 Field-of-View Scan Width is twice height At 7 feet coverage is14 feet
4 PPS Performance Spec Phase Laser Radar (Class IIIB ) Developed for high speed pavement survey Million Points per Second 950 Points per scan 0.15 to 0.28 inches between points ±0.02 inch Accuracy at MSPS Precision + Bias Peak to peak, not rms.
5 Applications Rolling Wheel Deflection Technology Driver Rut and Ride Rut Bar Replacement (IRI) Texture, Distress Correlation, Shoulder Mobile Mapping Precision DTM Road Design, Vehicle Dynamics
6 Development Prototypes for RWD USACE-WES SBIR funded development. Rutting for LTPP Westrack 1997 PSI Patented RWD Roll-by Deflection Demonstrated FHWA(ARA) SBIR Rolling Wheel Deflectometer (RWD) Ohio 1999 Single Scanner Used
7 Road Condition Testing Units In-service since October 2002
8 Manhole Sequence Amplitude 75 scans in seconds at 64 KPH Profile RaisedMarker Plot Courtesy Mandli Comminucations Screen Capture of Scan Display Cropped to zoom on manhole Screen Capture
9 2005 Road Survey Road Reproduction for Ride Testing (BMW) LA Area (405) Impossible to close road Fine Grain DTM Joints Faults Slab angles Distress
10 Caltrans: I-15 Reversible HOV Lanes Dave Olander Caltrans District 11 Survey Two HOV Lanes 1.8 Km with overpass Shoulders and K-rails Extensive Controls Surveyed during midday direction reversal Cross section every 5 meters 5-10 points per cross section
11 Caltrans: I-15 Reversible HOV Lanes Permanent Control Used for conventional and mobile survey Navigation Differential GPS Inertial Kalman Filtering
12 KDOT I-135 Project August 2007 Mike Frecks, Optira Survey Expertise Terrestrial scanning experience Quest for mobile scanning PEC/Kansas DOT 6.8 miles 7 overpasses 3/4 lanes + shoulders Gore areas
13 I-135 Project Control 280 points Inner & outer shoulders North & South bound Every 500 feet
14 Rumble Strip Topology Full Resolution Every Scan (~1/in.) Every Point (av 0.2 in.)
15 Integral Boresighted IMU Factory Alignment Self Contained Transport by Air Freight Easy Intallation
16 Rugged Terrain Using New DSB
17 Improvised Rail Test Phoenix Scientific Inc.
18 Rail Sample
19 Real-time Display
20 5 Scatter Plot Run 6 Scan Elevation (inches) Transverse Position (inches)
21 5 Scatter Plot Run 6 Scan 10 4 Elevation (inches) Transverse Position (inches)
22 Rail Measurement Requirements Field of View Rails, Rail Bed, Surrounding Accuracy Structure, Relative Orientation, Geodetic Position Frequency Point Density: Transverse and Longitudinal Latency: Real-time vs. Post-Processed
23 Rail Scanning Concept
24 Optional Additional Information
25 Aerial Lidar Software Profile Window Profile Box at Northing feet 1 Foot Merrick Advanced Remote Sensing Software MARS
26 Control with Point Cloud Hidden 1 Foot Control Points (4) white pixels
27 Scan Inspection 1 Foot Decimation (~0.75%) ~220 points/scan (~25%) (20 cm grid) ~1 scan per 3 feet (~3%)
28 Color Coded Runs 1 Foot Points Tagged with Time or Scan Number
29 3 and 4 Lane Samples
30 Full Resolution Example Recessed Rumble Strip One Run Straddling Shoulder Divots ~ 6x12 inches ~ 10 inch spacing
31 Rumble Strip Cross section 1 Foot ~0.75 inches
32 Rumble Strip Topology Full Resolution Every Scan (~1/in.) Every Point (av 0.2 in.)
33 Rough Terrain TACOM High Mobility Multipurpose Wheeled Vehicle (HMMWV) Vtech (VTPL), Dr. John Ferris Photographed by John McCormick
34 Integrated New Design DSB Ambiguity 3.2 meters Embedded Novatel SPAN Interface FPGA Network Provision (Gigabit Ethernet) Max Rate MSPS
35 Summary Survey grade mobile survey a reality Enabled by PSI Scanner Unparalleled accuracy & speed Inertial aided Differential GPS Navigation Survey control tailored to requirements Options for Technology Deployment Service Sale of sensors and systems Partnering, Licensing and Acquisition
36 Tinned PCC
37 Elevation (inches) Longitudinal Tinning and Faulting Jointed PCC (I5N) worn in wheel path Joint Fault ~60mils Scan Scan Signal Level Binning eliminates tinning effect on LP/IRI Edge of slab joint Transverse Position (inches) Edge of lane line Signal (max 500 mv)
38 LP/Ride in Urban Stop-and-Go Traffic Speed Independent LP w/o an accelerometer Ohio Test Road 1999 LVDT s and Start of overlay
39 Longitudinal Scanning TRL Emulation of HRM Processing Emulate HRM with discrete points Use all points to maximize performance Uses Urban stop & go True reference profiles
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