RESULTS OF BPR ROAD-ROUGHNESS-INDICATOR TESTS: EFFECTS OF TIRE TYPE AND ROUGHNESS CONDITION AND INSTALLATION OF O- RINGS IN DASH POTS

AT LAST YEAR'S MEETING OF THE HIGHWAY RESEARCH BOARD QUESTIONS WERE RAISED ABOUT THE EFFECT OF TIRE TYPE AND ROUNDNESS ON ROAD ROUGHNESS VALUES MEASURED WITH THE BPR ROUGHNESS INDICATOR. SINCE THEN TESTS HAVE BEEN CONDUCTED IN CALIFORNIA IN WHICH THE VARIABLE EFFECTS OF THESE CONDITIONS WERE INVESTIGATED. THE ROUGHNESS RESULTS WERE ALMOST IDENTICAL FOR (1) O-RING INSTALLATIONS WITH A MINIMUM TIGHTNESS OF FIT TO PREVENT LEAKAGE WITH A MINIMUM OF PISTON DRAG AND FOR (2) TESTS WITH NO RINGS. WHEN O-RINGS WERE INSTALLED WITH THE GROOVE DEPTH RECOMMENDED BY THE MANUFACTURER, CONSIDERABLE DRAG WAS NOTED, AND IN BOTH THE CALIFORNIA AND BPR TESTS THERE WAS A 10--35% DECREASE IN ROAD ROUGHNESS VALUES FOR THE TWO TEST CONDITIONS, WITH AND WITHOUT RINGS.

  • Supplemental Notes:
    • Vol 22, No 7, PP 20-24, 3 TAB, 1 APP
  • Authors:
    • MOYER, R A
  • Publication Date: 1952-7

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Filing Info

  • Accession Number: 00207423
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 28 1972 12:00AM