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.

  • Supplemental Notes:
    • Sponsored in part by Federal Highway Administration, Washington, D.C.
  • Corporate Authors:

    National Bureau of Standards

    Engineering Mechanics Section
    Washington, DC  United States  20234

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Kearns, R W
    • WARD, J F
  • Publication Date: 1974-12

Media Info

  • Pagination: 41 p.

Subject/Index Terms

Filing Info

  • 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