GRADE MEASUREMENT WITH AN INSTRUMENTED CAR
Grade information may be needed for route surveys and is important when fuel consumption is studied. An instrumented car was used to measure acceleration along the road surface by double differentiating accumulated pulses generated off the drive train. A second acceleration measure included the component due to gravity relative to the car body. The difference between these acceleration measures contains grade information but is also influenced by suspension dynamics and pitch of the car body. The effect of suspension dynamics was removed by filtering which limited the minimum wavelength to 160m. The effect of pitch was removed by a correction based on acceleration, jerk and the square of vehicle speed. The correction was computed from data collected on a level airfield runway. The method is verified for a high capacity arterial road. Grade is measured to within 0.001 rad (95% confidence limits). Elevation derived from the grade data was consistent with road construction drawings to the same limits.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/01912615
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Corporate Authors:
Pergamon Press, Incorporated
Headington Hill Hall
Oxford OX30BW, -
Authors:
- Rogers, K J
- TRAYFORD, R S
- Publication Date: 1984-6
Media Info
- Features: Figures; References;
- Pagination: p. 247-254
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Serial:
- Transportation Research Part B: Methodological
- Volume: 18B
- Issue Number: 3
- Publisher: Elsevier
- ISSN: 0191-2615
- Serial URL: http://www.sciencedirect.com/science/journal/01912615
Subject/Index Terms
- TRT Terms: Arterial highways; Measurement; Route surveying; Slopes
- Uncontrolled Terms: Grade (Slope)
- Old TRIS Terms: Grade profile
- Subject Areas: Design; Highways;
Filing Info
- Accession Number: 00393625
- Record Type: Publication
- Source Agency: National Highway Traffic Safety Administration
- Report/Paper Numbers: HS-037 528
- Files: HSL, TRIS, ATRI, USDOT
- Created Date: Apr 29 1985 12:00AM