A METHOD AND MEANS OF CALIBRATING AN AIR-BEARING FORCE PLATE FOR USE WITH A TOWED PAVEMENT FRICTION TEST TRAILER
The equations for the variation of the external forces acting at the tire-pavement interface of a symmetrical two-wheeled towed trailer are given. Estimates, derived from experimental results, have been made for the displacement of the tire-plate interface with respect to the ground of an unrestrained locked test tire on the trailer. A description of the force plate calibration test frame, instrumentation and test method is given. The means of applying simultaneous vertical (normal) and horizontal (longitudinal) forces at the contact surface of the air-bearing plate in accordance with the equations are discussed. The change in force plate output with changes in the dimensions of the trailer calibrated in-turn with the force plate are given. A method of locating the coordinate axes of the internal force sensors with respect to level is given. Consistent application of these methods to both the force plate and trailer transducer calibrations results in reduced vertical-to-horizontal cross-axis differences.
- Sponsored in part by Federal Highway Administration, Washington, D.C.
National Bureau of StandardsEngineering Mechanics Section
Washington, DC United States 20234
Washington, DC United States 20590
- Kearns, R W
- WARD, J F
- Publication Date: 1974-12
- Pagination: 41 p.
- TRT Terms: Calibration; Equations; Equipment tests; Force; Loads; Pavements; Plates (Engineering); Rolling contact; Skid resistance; Skid trailers; Test procedures; Testing equipment; Tires; Trailers
- Uncontrolled Terms: Horizontal loads; Plates; Vertical loads
- Old TRIS Terms: Test equipment
- Subject Areas: Highways; Pavements; Vehicles and Equipment;
- Accession Number: 00092990
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: NBSIR-75-738 Final Rpt.
- Files: NTIS, TRIS, USDOT
- Created Date: Nov 18 1976 12:00AM