In the design of a rotor-bearing system, information is usually available on the steady-state performance of the bearing. The designer can estimate the eccentricity ratio and attitude angle for any operating condition, but there is often little or no information which can be used to predict whether or not this is a stable operating condition. This paper describes the basic theory of bearing stability and shows how this can be used to help in the design of a novel apparatus for determining the stability parameters of any journal-bearing system.
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