Nondestructive tire testing techniques have been developed and the resultant technology enhancement has been incorporated into a prototype machine capable of performing on-vehicle tests of passenger vehicle tires with respect to three parameters: carcass integrity, inflation pressure, and tread depth. Carcass integrity determinations are made by exciting the tire with a random forcing function (bandwidth 100-400 Hz) and measuring the sidewall response as the tire rotates between displacement transducers. The random noise concept is shown to be superior to using a sinusoidal forcing function at a particular frequency. A temperature and pressure compensating inflation pressure control device has been developed. The device consists of an instrumented chuck and a control system capable of calculating the equivalent tire pressure at 72F, comparing it to a preset value, and adjusting the tire pressure as necessary to the set cold pressure point. A passover tread depth device has been produced. The device is basically a feeler gage, with 400 probes over a 10-inch distance which extend to engage the tire as it passes over the head plate. The travel of the probe results in a change in capacitance, and a processing circuit calculates a tread profile for each tire. These elements were incorporated into a prototype inspection machine intended for use in an automated vehicle inspection facility.

  • Corporate Authors:

    Southwest Research Institute

    6220 Culebra Road, P.O. Drawer 28510
    San Antonio, TX  United States  78228-0510

    National Highway Traffic Safety Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Johnson, J E
    • Hugg, S B
    • Schroeder, E C
    • Thomas, R E
  • Publication Date: 1978-3

Media Info

  • Pagination: 25 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00186184
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: DOT-HS-803-578 Final Rpt.
  • Contract Numbers: DOT-HS-5-01066
  • Files: NTIS, TRIS, USDOT
  • Created Date: Feb 3 1979 12:00AM