FORMATION OF STANDING WAVE IN ROLLING TIRES: RADIAL PASSENGER TIRES

Radial passenger tires of different makes were subjected to high speed rolling under load on a testing wheel to determine the critical speed at which the standing wave starts to form. The tires of different makes exhibited significantly different levels of the critical speed. The damping coefficient and mass density of the tire wall of the tires tested were measured and, using the circular membrane model, the correlation between these properties and the observed critical speed of standing wave formation was sought. As expected from the model, a higher critical speed, which is desirable for a standing-wave-free tire, calls for a higher damping coefficient and a lower mass density of the tire wall. The damping coefficient, in particular, plays an important role and it should not be neglected in the analyses. In the comparison of the tire walls reinforced with steel cord and polymeric cord, the former generally exhibits a higher damping coefficient than the latter, contrary to the common expectation. Although the single steel filaments are elastic, the inter-filament friction in the steel cord provides more damping effect than the polymeric cord. Steel-reinforced tire wall also has a higher mass density. The damping coefficient is directly related to the mechanical loss in cyclic deformation and, hence, to the rolling resistance of a tire. Thus, the study shows that, in principle, it is more difficult to design a standing-wave-free and fuel-efficient tire with steel cord than it is with polymeric cord.

• Supplemental Notes:
  • Reproduced from "Review of Allied Tire Mechanics Research."
• Corporate Authors:

  Allied Corporation

  Corporate Technology, P.O. Box 1021R
  Morristown, NJ  United States  07960
• Authors:
  • KWON, Y D
  • Prevorsek, D C
• Publication Date: 1979

Media Info

• Features: Figures; References; Tables;
• Pagination: 46 p.

Subject/Index Terms

• TRT Terms: Coefficients; Damping (Physics); Design; High speed ground transportation; High speed vehicles; Mechanical properties; Radial ply tires; Rolling resistance; Speed; Tires; Waves
• Uncontrolled Terms: Standing waves
• Old TRIS Terms: Radial tires
• Subject Areas: Design; Railroads; Safety and Human Factors; Vehicles and Equipment;

Filing Info

• Accession Number: 00395838
• Record Type: Publication
• Source Agency: National Highway Traffic Safety Administration
• Report/Paper Numbers: HS-038 124
• Files: HSL, USDOT
• Created Date: Jul 31 1985 12:00AM