HIGH-SPEED PROFILOMETRY

THE GENERAL MOTORS RAPID TRAVEL PROFILOMETER HAS BEEN EVALUATED BY THE MICHIGAN DEPARTMENT OF STATE HIGHWAYS. IT MEEETS OR EXCEEDS ALL SPECIFICATIONS FOR ACCURACY AND RELIABILITY. IT DOES NOT RETURN A SURVEY TYPE OF ELEVATION MAP BECAUSE LONG-WAVE FEATURES MUST BE FILTERED OUT. FOR THIS REASON, ITS PROFILES MUST BE VIEWED AS CORRECT IN THE FREQUENCY DOMAIN BUT INCORRECT IN THE SPATIAL DOMAIN. AN INERTIAL GUIDANCE SYSTEM CAPABLE OF RECORDING LONG-WAVE FEATURES WOULD SOLVE THE PROBLEM. PROFILE ANALYSIS IN THE FREQUENCY DOMAIN IS CONFINED TO THE 4 BASIC MEASURES: MEAN SQUARES, AMPLITUDE DISTRIBUTIONS, AUTOCORRELATION, AND POWER SPECTRAL DENSITY. IT IS POSSIBLE TO EXTRACT SOME SINGLE NUMBER INDEXES BASED ON THE 4 STANDARD MEASURES. POWER SPECTRAL DENSITY APPEARS TO BE MOST INTERESTING FOR HIGHWAY WORK. /AUTHOR/

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/hrr/1971/362/362-009.pdf
• Supplemental Notes:
  • Sponsored by Committee on Surface Properties--Vehicle Interaction and presented at the 50th Annual Meeting. 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.
• Authors:
  • Darlington, J R
• Publication Date: 1971

Media Info

• Media Type: Digital/other
• Features: References; Tables;
• Pagination: pp 98-103
• Monograph Title: Pavement systems
• Serial:
  • Highway Research Record
  • Issue Number: 362
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: High speed ground transportation; High speed vehicles; Profilometers; Speed; Wavelength
• Subject Areas: Highways; Pavements; Railroads;

Filing Info

• Accession Number: 00207394
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Mar 7 1972 12:00AM