Titlebook: Dynamics of Rotors; Stability and System Oskar Mahrenholtz Book 1984 Springer-Verlag Wien 1984 Dynamics.Stability.System.dynamics.identific

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Vibration Measurement and MonitoringSuccessful vibration measurement and analysis require an intimate familiarity with types of measurement, transducer characteristics and application, plus the capabilities and limitations of the diagnostic instrumentation.

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Identification of Modal Parameters of RotorsThe occurence of instability in rotating machinery may be caused by different effects: oil film in journal bearings, sealings, internal damping etc.

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Theory of Bearing Static and Dynamic Properties acting on the journal at any moment of its vibrations. Discussed here will be hydrodynamic journal bearings, applied widely in machines. These bearings at sufficient oil supply, produce oil film and generate oil pressure and separate fully rotating journal from the sleeve.

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Stiffness and Damping Characteristics of Tilting-Pad Journal Bearingsics of the bearings. Large turborotors are usually guided in hydrodynamic journal bearings. Tilting-pad journal bearings are used particularly for horizontal or vertical shafts of high diameters. If the amplitude of the shaft vibration is small compared with the clearance of the bearing, the charact

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Principles of Rotor System Instabilitythe speed ω, are of the form . External h. and internal h. damping coefficients, reduced to the reference unit mass (Aρ). of the shaft are . c. and c. are equivalent viscous coefficients of external and internal damping and Aρ and EI are respectively mass of unit length and stiffness of the shaft, b

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Stability of Rotors in Bearingscalled “threshold” speed. Stable operation usually resumes when the speed is again decreased below this threshold speed. Unstable whirl motions can cause mechanical problems such as rubbing between journal and bearing, seal rubbing, and blade/stator rub contacts, and may result in substantial machin