Evaluation of methods for experimental and analytical determination of the contour area of the contact patch of a pneumatic tire with a support base

The results of experiments on the estimation error methods experimental and calculated determination contour area for ecological assessment a mobile energy device are presented. There was used example modern radial tires 360/70R24 Bel-89 18.4R34 F-11 agricultural tractor MTZ-1025.2. in modes non-nominal loading at nominal load changes tire pressure within range recommended field work. assess possibility improving computational method determining contact patch tread pneumatic wheel based mathematical model V.L. Biederman. carried out four ways patch: 1) directly measuring using digital photograph Kompas-3D V13 software with scaling square from 100x100 mm graph paper; 2) calculation by formula an ellipse, length width patch, measured tape measure obtained print; 3) calculation, determined software; 4) parameters universal characteristic (UTC).
 As result experiments, it found that tires, static deformation which does not exceed 1822 %, theoretical UTC can be applied sufficient (for engineering practice) accuracy. Full convergence areas provided coefficient their ratio. calculating conditional showed these well comparative technogenic mechanical impact propellers soil.