ANALYTICAL STUDY OF WEIGHING METHODS FOR HIGHWAY VEHICLES IN MOTION

AN ANALYTICAL STUDY PROGRAM IS DESCRIBED FOR THE INVEST- IGATION OF ERROR ASSOCIATED WITH THE WEIGHING OF HIGHWAY VEHICLES IN MOTION, USING MULTI-PLATFORM ELECTRONIC SCALES PLACED IN THE HIGHWAY. THE ERROR ASSOCIATED WITH A WEIGHING SYSTEM COMES FROM TWO SOURCES: (1) THE ELECTRONIC EQUIPMENT FOR THE MEASUREMENT OF FORCE ON A HIGHWAY, AND THE PROCESS- ING OF DATA; AND (2) THE COMPUTATIONAL PROCEDURES EMPLOYED TO ASCERTAIN AXLE WEIGHT FROM THE SAMPLED FORCE DATA PROVID- ED BY THE PLATFORMS. THE VARIOUS DYNAMIC WAVEFORMS ASSOCIAT- ED WITH THE HIGHWAY VEHICLES WERE REVIEWED, AND SEVERAL COMPUTATIONAL PROCEDURES WERE EMPLOYED TO ASCERTAIN AXLE WEIGHTS FROM THE EXPECTED SAMPLED FORCE DATA WHICH WOULD BE PROVIDED BY A NUMBER OF PLATFORM TRANSDUCERS OR SCALES. THE INVESTIGATION OF COMPUTATIONAL METHODS FOR DETERMINING WEIGHT FROM THE SAMPLED FORCE DATA INCLUDED THE FOLLOWING: (1) DIRECT AVERAGING METHODS, WHEREBY THE FORCE OVER PLATFORMS WAS SIMPLY AVERAGED TO YIELD AN ESTIMATE OF AXLE WEIGHT, (2) DYNAMIC METHODS, WHEREBY AN ANALOGOUS MECHANICAL OSCILLATOR IS EMPLOYED TO FIT A SINE CURVE THROUGH THE OSCILLATING COMPONENT OF FORCE IN THE AVERAGE, (3) INTEGRAL MODEL III, WHEREBY A REGRESSION MODEL APPROXIMATING THE SECOND INTEGRAL OF AXLE FORCE WAS USED TO COMPUTE WEIGHT, AND (4) METHOD VWEIGH, AN AVERAGING PROCESS WHEREBY INTER- POLATION IS EMPLOYED TO YIELD A CONTINUOUS FORCE DATA RECORD. THE STUDY SHOWED THAT SIMPLE AVERAGING OVER THE PLATFORMS IS AN ECONOMICAL METHOD THAT CAN BE EMPLOYED, USING READILY AVAILABLE STANDARD EQUIPMENT AT A HIGHWAY SITE, WITH MAXIMUM ERROR GENERALLY LESS THAN 5 TO 6 PERCENT, DEPENDING ON VEHICLE OSCILLATION.

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    • Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved. 63 PP, 17 FIG, 5 TAB, 11 REF, 9 APP
  • Authors:
    • Herrick, R C
  • Publication Date: 1969

Media Info

  • Media Type: Digital/other
  • Serial:
    • NCHRP Report
    • Issue Number: 71
    • Publisher: Transportation Research Board
    • ISSN: 0077-5614
  • Publication flags:

    Open Access (libre)

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Filing Info

  • Accession Number: 00227941
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: Mar 9 1970 12:00AM