Abstract
The aim of this paper is to provide a compact as well as comprehensive overview of Rotor-Stator Contact in rotor dynamics. A general model is described which accounts for most phenomena of Rotor-Stator Contact observed in literature. This model is compared to different modeling approaches used in the previous literature. A glance on the variety of motion patterns including analytical approaches to the synchronous motion and Backward Whirl motion is given. As an outlook a modal reduction technique is pointed out, which is capable of reducing systems with many degrees of freedom for rotor as well as stator to the described model.
Highlights
In rotating machinery there is often the possibility of the rotor contacting a non-rotating device due to the deformation of the rotor shaft
The aim of this paper is to provide a compact as well as comprehensive overview of Rotor-Stator Contact in rotor dynamics
A general model is described which accounts for most phenomena of Rotor-Stator Contact observed in literature. This model is compared to different modeling approaches used in the previous literature
Summary
In rotating machinery there is often the possibility of the rotor contacting a non-rotating device (e.g. stator, housing or retainer bearing) due to the deformation of the rotor shaft. This might lead to dangerous, mostly non-controllable vibrations. Severe damage of rotating machines is generally not caused by synchronous nonlinear motion but rather caused by asynchronous motions These vibrations are usually related with huge contact forces and impacts. To study the dynamics that occur during Rotor-Stator Contact it is important to focus on simple models that are on the one side capable of including all important effects and on the other side alow for an understanding of the mechanisms of these phenomena. By applying a modal decoupling technique this model is able to describe systems consisting of a higher amount of degrees of freedom at least in a restricted regime
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