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From page 113... ... B-1 A P P E N D I X B Experimental Evaluation of Inertial Profilers for Use on Urban and Low-Speed Roadways This appendix describes an experiment conducted to examine the effects of potentially adverse operational conditions on the measurement of longitudinal road profile by high-speed inertial profilers. The experiment included staged reproductions of common operational conditions encountered while conducting network-level profile measurements on urban and low-speed roadways, such as • operation at low speed, • acceleration or deceleration, • stop-and-go operation, • profiling from a dead stop, • initiation of profile collection before real-time filters have stabilized, • operation on a curve, and • operation on a transition into and out of a curve. Read the entire page →
From page 114... ... B-2 B.1.1 Tangent Section Most of the testing took place on a tangent section running southeast along the northern straightaway on the MnROAD low volume loop. Figure B-1 shows the layout. Read the entire page →
From page 115... ... B-3 (3.16 m/km) on both sides at this location. Read the entire page →
From page 116... ... B-4 began on a tangent at the transition between cell 33 and cell 43 and terminated on a tangent heading southeast. The section included a 75-degree change in direction to the right on a 200-ft (61-m) Read the entire page →
From page 117... ... B-5 slab locations. Table B-1 lists the measured cross slope values. Read the entire page →
From page 118... ... B-6 Figure B-4. SSI CS9100 Mid Mount high-speed inertial profiler. Read the entire page →
From page 119... ... B-7 Figure B-7. Dynatest RSP 5051 Mark III high–speed profiler. Read the entire page →
From page 120... ... B-8 B.3 Reference Measurements Reference profile data were collected using a SurPRO 3500 on the curved section and the tangent section. This device recorded profile data at 1-in (25.4-mm) Read the entire page →
From page 121... ... B-9 Table B-4. GPS antenna locations relative to profiler footprint. Read the entire page →
From page 122... ... B-10 • Disengage the throttle and/or the cruise control at the primary landmark and coast to the end of the section. B.5.3 Acceleration/Deceleration These tests included longitudinal acceleration or deceleration within the test section, typically from operation at one preset constant speed to another. Read the entire page →
From page 123... ... B-11 B.5.4 Stop-and-Go Operation These tests included a stop within the tangent section from operation at one preset constant speed, followed by acceleration back to the preset speed. The following instructions were provided: • Enter the tangent section at the requested initial speed. Read the entire page →
From page 124... ... B-12 B.5.6 Sudden Initiation of Profile Collection In these tests, operators were asked to initiate collection of profile while the vehicle was in motion without lead in for filter initialization. The following instructions were provided: • Enter the tangent section at the requested initial speed. Read the entire page →
From page 125... ... B-13 At this location, an increase in latitude of 10-8 deg corresponds to a shift northward of 0.044 in (1.1 mm) , and a change in longitude of 10-8 deg corresponds to a shift eastward of 0.031 in (0.78 mm) Read the entire page →
From page 126... ... B-14 sections, this was approximately 3,956.944 mi (6,368.084 km) Read the entire page →
From page 127... ... B-15 where Δψ is the change in heading angle with the sign reversed for a X-forward, Y-leftward, and Z-upward coordinate system. (GPS provides compass heading, which sweeps from north to east.) Read the entire page →
From page 128... ... B-16 compatibility with the other. Tables B-15 through B-20 present the results for the IRI waveband, and Tables B-21 through B-26 present the results for the long waveband. Read the entire page →
From page 129... ... B-17 Table B-12. Agreement scores, IRI waveband, no DMI correction, profiler 4, left. Read the entire page →
From page 130... ... B-18 Table B-15. Agreement scores, IRI waveband, DMI correction, profiler 1, left. Read the entire page →
From page 131... ... B-19 Table B-18. Agreement scores, IRI waveband, DMI correction, profiler 4, left. Read the entire page →
From page 132... ... B-20 Table B-21. Agreement scores, long waveband, DMI correction, profiler 1, left. Read the entire page →
From page 133... ... B-21 Table B-24. Agreement scores, long waveband, DMI correction, profiler 4, left. Read the entire page →

From page 113...

... B-1 A P P E N D I X B Experimental Evaluation of Inertial Profilers for Use on Urban and Low-Speed Roadways This appendix describes an experiment conducted to examine the effects of potentially adverse operational conditions on the measurement of longitudinal road profile by high-speed inertial profilers. The experiment included staged reproductions of common operational conditions encountered while conducting network-level profile measurements on urban and low-speed roadways, such as • operation at low speed, • acceleration or deceleration, • stop-and-go operation, • profiling from a dead stop, • initiation of profile collection before real-time filters have stabilized, • operation on a curve, and • operation on a transition into and out of a curve.