Abstract
Tire characteristics and behavior are of great importance in vehicle dynamics since the forces transmitted in the tire-road contact are the main contributors to global vehicle performance. Several research groups have focused on the study and modeling of tires. Some of the most important factors that need to be known are tread characteristics and pressure distribution in the tire-ground contact patch. In this work, a test bench has been used to adequately determine the aforementioned factors. The measurement principle of the test bench is the frustration of total internal reflection (FTIR) of light. It makes use of a laterally illuminated glass on which the tire leans. An interposed plastic interface between them causes the reflection of light. Finally, a video camera captures the bright image formed through the glass. The brightness level in each pixel of the image is related to existing normal pressure. A study of the parameters that affect the test bench calibration such as type of interface material used, diffuse light, hysteresis, creep and transverse light absorption is performed. Experimental tests are conducted to relate tire inflation pressure and camber angle to the pressure distribution. Furthermore, the test bench is used to detect and evaluate the influence of defects in the tire on the contact pressures.
Highlights
The study of tire behavior is of great interest in the field of vehicle dynamics
The modification introduced by the contribution of the material causes defect is not adequate since thealteration pressure in distribution is severely altered as a consequence of the great loss of tire characteristics: the tread pattern which is fundamental for the correct great loss of tire characteristics: alteration in the tread pattern which is fundamental for the correct addition of synthetic rubber
The procedure of calibration and improvement of a test bench based on the frustration of total internal reflection (FTIR) phenomenon The procedure of calibration and improvement of a test bench based on the FTIR phenomenon
Summary
The study of tire behavior is of great interest in the field of vehicle dynamics. The tire is the only contact zone of the vehicle with the road. The variation of resistance with pressure (piezoresistive sensors) or the generation of electric current with the application of a force (piezoelectric sensors) of the measurement points located in the contact zone allow obtaining the pressure value at discrete points in the tire patch. This paper first describes a test bench to measure tire contact patch pressures based on the FTIR improves the image quality and the reliability of this technique. An interesting field where test bench has been proved to be a very useful tool is the detection and characterization of
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