An aerodynamic bearing with adjustable geometry and self-lifting capacity. Part 1: Self-lift capacity by squeeze film

Abstract

An aerodynamic bearing capable of self-lift by squeeze film is presented. The bearing uses piezoelectric actuators and elastic hinges in order elastically to deform the initial cylindrical clearance to a three-lobe clearance. The three-lobe clearance can cyclically deform with sufficient amplitude and frequency to generate a squeeze-film pressure. This squeeze-film separates the shaft and bearing surfaces, and eliminates rubbing of the two surfaces at low rotational speeds. Numerical and experimental results show that, although the proposed bearing has a relatively low squeeze-film load capacity, it is practically feasible.