I. Introduction
The bearings are commonly used in the rotating machinery. They are comprised of rolling elements arranged between two coaxial rings. Their main roll is the positioning of the shaft in the machine frame and the friction reduction. The external load is transferred from one raceway to the other through the rolling elements. The charge distribution on the rolling elements is unequal and depends on the internal geometry of the bearing and the magnitude of the external load. The knowledge, at any time, of the external load transmitted through the rolling elements could allow developing many industrial applications, especially:
The measurement of static and dynamic loads.
The fault detection of mechanical components.