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The development results of a single-point contact system set up as a pendulum to study the laws of rolling resistance to contacting bodies at a distance significantly reduced compared to the elastic contact spot size. The designed device uses a physical pendulum sustained by only one ball on a flat polished surface. The problem of stability of the pendulum swing plane is solved. A phenomenological theory of rolling resistance is described. The surface tension of solids on the contact zone, parameters of the frequency-independent internal friction and the pressure of the adhesion forces are found. [ABSTRACT FROM AUTHOR]

The development results of a single-point contact system set up as a pendulum to study the laws of rolling resistance to contacting bodies at a distance significantly reduced compared to the elastic contact spot size. The designed device uses a physical pendulum sustained by only one ball on a flat polished surface. The problem of stability of the pendulum swing plane is solved. A phenomenological theory of rolling resistance is described. The surface tension of solids on the contact zone, parameters of the frequency-independent internal friction and the pressure of the adhesion forces are found.

Ultra-precision positioning is contaminated by the non-linearities and hysteresis caused by Hertzian contact at pre-rolling due to the absence of accurate models that could be implemented by positioning controllers to compensate for it. In this paper an attempt is made to model such behaviour at low speed and dry conditions while taking into account the mechanical characteristics of the bodies in contact. The proposed model simulates the non-linear behaviour, called non-linear spring behaviour (NSB), from pre-rolling to the steady state rolling without a transitional function. The model is compared to experimental measurements performed with several materials. [ABSTRACT FROM AUTHOR]