EVALUATING A PERIPHERAL DEFORMATION OF A TIRE DURING USE

摘要

The invention relates a system for evaluating a value linked to a peripheral deformation of an object (1) rotating about an axis (A) and having a belt (41) made of an at least partly ferromagnetic material, constrained to a circular shape in the absence of external pressure imposed on a section of the periphery thereof, while an external pressure leads to a crushing of said section, comprising: at least one magnetometer (5) aligned with a radius of said object outside the periphery thereof and spaced apart from the rotational axis (A) which is fixed or on average fixed during the course of evaluation; and means for evaluating a variation in the amplitude of the magnetic field measured by said at least one magnetometer over several revolutions of the object, said variation in amplitude corresponding to a variation in the radius (R) of the belt outside said section.