TxDOT CERTIFICATION PROGRAM WITH COMMENTS ON PORTABLES

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TxDOT CERTIFICATION PROGRAM WITH COMMENTS ON
PORTABLES

• Emmanuel Fernando
• Texas Transportation Institute
• Texas AM University
• 2003 Road Profiler Users Group Conference
• Austin, Texas

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FROM PROFILOGRAPH TO INERTIAL PROFILER-BASED
SPECIFICATION
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FROM PROFILOGRAPH TO INERTIAL PROFILER-BASED
SPECIFICATION
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FROM PROFILOGRAPH TO INERTIAL PROFILER-BASED
SPECIFICATION
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FROM PROFILOGRAPH TO INERTIAL PROFILER-BASED
SPECIFICATION
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FROM PROFILOGRAPH TO INERTIAL PROFILER-BASED
SPECIFICATION
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FROM PROFILOGRAPH TO INERTIAL PROFILER-BASED
SPECIFICATION
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FROM PROFILOGRAPH TO INERTIAL PROFILER-BASED
SPECIFICATION
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SPECIFICATION REQUIREMENTS

• For QA under Surface Test Type B, Contractor
  provides
• Inertial profiler certified according to Test
  Method Tex-1001-S
• Certified inertial profiler operator

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TxDOT CERTIFICATION PROGRAM

• Administered by TTI
• Equipment certification
• Profiler operator certification
• Certifications conducted monthly

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Certification of Inertial Profilers
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REQUIREMENTS FOR INERTIAL PROFILER CERTIFICATION

• Operating parameters
• Certification tests

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OPERATING PARAMETERS

• Reporting interval ? 6 inches
• Cutoff wavelength of 200 feet
• Wheelpath sensor spacing of 69 in.
• Other operational features

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OPERATING PARAMETERS

• Other operational features
• Automatic triggering of data collection

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OPERATING PARAMETERS

• Other operational features
• Provide data in electronic files
• Calculate and report IRI
• Provide for verification of calibration

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INERTIAL PROFILER CERTIFICATION TESTS

• 0.1-mile test sections
• Smooth
• Medium-smooth

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INERTIAL PROFILER CERTIFICATION TESTS

• Test Data
• Repeat profile measurements
• Data files written in required format
• Files named following convention established

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INERTIAL PROFILER CERTIFICATION TESTS

• Equipment Repeatability
• Based on 10 repeat runs
• Measured using average standard deviation
• Evaluated for each wheelpath surveyed

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INERTIAL PROFILER CERTIFICATION TESTS
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INERTIAL PROFILER CERTIFICATION TESTS

• Equipment Accuracy
• Evaluated against benchmark profiles
• Same profiler filter applied to benchmark
  profiles
• Average profiles determined
• Point-to-point differences in average profiles
  obtained

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INERTIAL PROFILER CERTIFICATION TESTS

• Equipment Accuracy
• Test Criteria Based on Profile
• Average difference ?1 within ?20 mils
• Average absolute difference ?2 ? 60 mils
• Profile accuracy evaluated for each wheel path
  surveyed

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INERTIAL PROFILER CERTIFICATION TESTS

• Equipment Accuracy
• Average IRIs from tests compared against
  benchmark IRIs
• Absolute difference between IRIs must be ? 12
  inches/mile
• Accuracy of IRIs checked for each wheel path
  tested

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INERTIAL PROFILER CERTIFICATION TESTS

• Test Results
• Summary report provided
• Profiler must comply with all requirements
• Decal placed on certified profiler

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SUMMARY STATISTICS ON PASSING INERTIAL PROFILERS
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PORTABLE PROFILERS
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PORTABLE PROFILERS
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CURRENT CERTIFICATION PROCEDURE FOR PORTABLES

• System detached and re-attached from vehicle
  prior to each run
• 10 runs made
• Profile data evaluated against criteria
• Portable certified for use on a specific vehicle
• Further evaluations needed to verify portability

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SUMMARY
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SUMMARY

• Certification is needed to implement new ride
  specification
• Certification program has provided a standard for
  vendors
• Further evaluations needed to verify portability