Potential of functional image processing technique for the measurements of contact area and contact pressure of a radial ply tire in a soil bin testing facility

H. Taghavifar, A. Mardani

Research output: Contribution to journalArticle

12 Citations (Scopus)


The exploration principally deals with a promising applicability of image processing method for contact area determination. A digital camera mounted on a single-wheel tester was utilized to take images of contact area at four levels of tire inflation pressure (i.e. 70, 100, 140, and 175 kPa) and six levels of wheel load (i.e. 0.75, 1.75, 2.75, 3.75, 4.75, and 5.75 kN). Contact pressure measurements, subsequently, were performed utilizing seven embedded load cells incorporated in an instrumented housing in longitudinal and perpendicular direction of traversing. It was observed that contact area is a polynomial (with order of two) function of wheel load while there was a reverse linear relation between contact area and inflation pressure. Furthermore, contact pressure has linear relation with vertical load and inflation pressure. Models for contact area and contact pressure were developed by multiple regression analysis while a classical predicting model was assessed using contact area results of image processing technique. The models indicated acceptable coefficient of determinations amounts of 0.974 and 0.953 for contact area and contact pressure models, respectively. However, applied image processing method denoted R2-value of 0.988 for contact pressure equation.
Original languageEnglish
Pages (from-to)4038-4044
Number of pages7
JournalMeasurement: Journal of the International Measurement Confederation
Issue number10
Early online date20 Jul 2013
Publication statusPublished - Dec 2013
Externally publishedYes



  • Contact area
  • Contact pressure
  • Image processing technique
  • Soil bin
  • Tire tester

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