Effects of Test Techniques on Wheel Performance,
Abstract
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1968
- Accession Number
- AD0746758
Entities
People
- Andrew J. Green
- N. R. Murphy