Magneto-Solid Mechanics

REVIEWSpresented in this section begin with two papers which sketch how to calculate the forces in hydrodynamic journal bearings and tilting pad bearings.Six papers then address instabilities due to: internal energy dissipation; asymmetries (such as bearing stiffnesses or inertias) which introduce time dependent parameters (solution by Floquet theory); fluid film bearings; gas seals; transverse-torsional coupling; and internal fluid flow.Particularly helpful are the two papers by Rieger (Ch.2.5 and 2.6) which give a concise history of these stability problems, explain quantitatively the physics of the instabilities using a simple rotor, and describe methods for suppression of instabilities.The section concludes with two papers on the interaction of rotating machinery with the surrounding support structure/ground.Part III -Balancing of Flexible Rotors.This section consists of a single paper which overviews the two methods for balancing: the modal approach; and the influence coefficient method.Part IV -Measurement and Identification.The six papers in this section begin with one on common vibration instruments and their uses on rotating machinery.The remaining papers deal with various aspects of the identification problem (how to deduce from measurements what the hard to predict rotor parameters are).

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