EFFECTS OF TEST TECHNIQUES ON WHEEL PERFORMANCE
A STUDY WAS MADE OF THE EFFECTS OF VARIOUS TESTING TECHNIQUES ON THE PERFORMANCE OF A TEST WHEEL MOUNTED WITH A PNEUMATIC TIRE OPERATING IN AN AIR-DRY DESERT SAND. TESTS EMPLOYING BOTH CONTROLLED-SLIP AND CONTROLLED-PULL TECHNIQUES WERE CONDUCTED WITH A SINGLE-WHEEL, DYNAMOMETER- EQUIPPED CARRIAGE. THE RESULTS ARE PRESENTED IN THE FORM OF GRAPHS WITH EMPHASIS PLACED UPON THE PULL-SLIP AND TORQUE- SLIP RELATIONS. FOR THE CONDITIONS TESTED, WHEEL PERFORMANCE WAS FOUND TO BE INDEPENDENT OF TESTING TECHNIQUES WITH ONE EXCEPTION: CONSISTENT DIFFERENCES WERE NOTED WHEN COMPARING RESULTS OF PROGRAMMED-INCREASING AND PROGRAMMED-DECREASING SLIP TESTS. ALTHOUGH THIS DISAGREEMENT OCCURRED ONLY FOR A NARROW RANGE OF SLIP (APPROXIMATELY -10 TO +10 PERCENT), IT CAN BE IMPORTANT. A BRIEF ANALYSIS OF THE HORIZONTAL FORCES ACTING ON THE DYNAMOMETER IS GIVEN TO AMPLIFY CERTAIN RELATIONS, PARTICULARLY DIFFERENCE IN PULL-SLIP AND DRAWBAR PULL-SLIP RESPONSES. IT IS SHOWN THAT BECAUSE OF THE INABILITY TO ALWAYS ATTAIN A STABLE CONDITION, CONTROLLED- SLIP TESTS ARE BETTER THAN CONTROLLED-PULL TESTS FOR DEFINING PULL-SLIP AND TORQUE-SLIP RELATIONS. /NTIS/
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Authors:
- MURPHY, N R
- Green, A J
- Publication Date: 1968-8
Media Info
- Pagination: 27 p.
- Serial:
Subject/Index Terms
- TRT Terms: Dynamometers; Sand; Test procedures; Tires; Wheels
- Uncontrolled Terms: Slippage
- Subject Areas: Highways; Safety and Human Factors; Vehicles and Equipment;
Filing Info
- Accession Number: 00223993
- Record Type: Publication
- Source Agency: National Technical Information Service
- Files: TRIS
- Created Date: Jul 17 1973 12:00AM