Dynamics of Full Annular Rotor Rub.
Abstract
Four modes of possible rotor motion are defined: synchronous precession (without rub), partial rub, full annular synchronous rub and reverse whirl. A model is developed to investigate the relationships between a rotational system's characteristic parameters and the conditions of equilibrium for the full annular rub motion. The dynamics of an unconstrained rotor with unbalance are first established. the impact of constraining the rotor's motion by a rigid casing with a finite clearance is then analyzed. For any given system, the speed regimes in which full annular synchronous rub is in equilibrium are defined as a function of the system's unbalance, clearance, rotor stiffness, damping and the coefficient of friction between the rotor and casing. The rigid stator restriction is subsequently alleviated and the equilibrium conditions for full annular synchronous rub are reanalyzed. Additionally, reverse whirl as a possible stable mode of rotor motion is studied. Specific rotational systems are then analyzed according to the model developed to demonstrate the effect of varying particular parameters.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1986
- Accession Number
- ADA173311
Entities
People
- Sean J. Stackley
Organizations
- Massachusetts Institute of Technology