Signal interference of non-uniform tire load on stress-in-motion sensing element

Sensing elements in Stress-In-Motion (SIM) system were designed to measure vertical and tangential tire-pavement contact forces under uniform loading conditions. However, in reality, the contact forces are not uniformly distributed. Compared with tangential shear force, non-uniform vertical contact force causes a bending moment which may take significant errors to tri-axial contact stress measurements. In the research, three tire thread-sensing element contact conditions (uniform, non-uniform and point load) were applied and influences of the non-uniformity on vertical and tangential stress signals were determined by finite element method. It was found that significant errors may occur as a result of the contact force non-uniformity. The error of the vertical contact force measurement was up to 65% (non-uniform load). In extreme situation with point load, the error would be greater. The errors caused by vertical contact force non-uniformity to the tangential contact stress measuring signals were 15% (non-uniform force) and 60% (point load). So designing of the SIM sensing element and decoupling method between measuring signals should be carefully reconsidered.


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  • Accession Number: 01761958
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 19 2020 3:01PM