Air Journal Bearing Utilizing Near-Field Acoustic Levitation Stationary Shaft Case

Abstract

Results of a study to examine a unique idea of self-levitating journal bearing are presented in this article. The idea represents a radical departure from the current bearing technology. It utilizes acoustic levitation, which relies on the sound energy radiated by an object supporting a load. Acoustic levitation has been demonstrated to support loads of up to 10 kg. In order to support a load the acoustic wave emitted by the radiating surface must be reflected back towards the radiating surface by the levitating object. The radiation pressure increases as the gap between the source of sound and levitating object narrows. Computer simulation and experimental testing of a prototype device were carried out and provided a conclusive proof of the idea.