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RISThree Dimensional Thermohydrodynamic Morton Effect Simulation—Part I: Theoretical Model
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The present study is focused on accurate prediction of the Morton effect problem including journal asymmetric heating and the corresponding long period amplitude oscillations using a nonlinear time transient rotordynamic ...
Three Dimensional Thermohydrodynamic Morton Effect Analysis—Part II: Parametric Studies
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper presents simulation results corresponding with the theoretical Morton effect model explained in Part I, where the 3D finite element models of bearing, shaft, and fluid film are adopted. In addition, it explains ...
Three Dimensional Dynamic Model of TEHD Tilting Pad Journal Bearing—Part I: Theoretical Modeling
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper is focused on a new modeling method of threedimensional (3D) thermoelastohydrodynamic (TEHD) cylindrical pivot tiltingpad journal bearing (TPJB). Varying viscosity Reynolds equation and 3D energy equation are ...
Magnetic Bearing Rotordynamic System Optimization Using Multi Objective Genetic Algorithms
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Multiple objective genetic algorithms (MOGAs) simultaneously optimize a control law and geometrical features of a set of homopolar magnetic bearings (HOMB) supporting a generic flexible, spinning shaft. The minimization ...
Double Overhung Disk and Parameter Effect on Rotordynamic Synchronous Instability—Morton Effect—Part I: Theory and Modeling Approach
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The Morton effect (ME) is a thermally induced instability problem that most commonly appears in rotating shafts with large overhung masses, outboard of the bearing span. The time-varying thermal bow due to the asymmetric ...
Rotordynamic Force Prediction of a Shrouded Centrifugal Pump Impeller—Part II: Stability Analysis
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In Paper I, some test cases of centrifugal pump impellers which showed unconventional impedances curves were reviewed and possible sources of the bump and dip in the impedance curves were investigated by simulating a ...
Rotordynamic Force Prediction of a Shrouded Centrifugal Pump Impeller—Part I: Numerical Analysis
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Computational fluid dynamics (CFD) is employed to calculate the fluidinduced forces in the leakage path of an incompressible shrouded centrifugal impeller. Numerical solutions of the whirling shrouded impeller at the ...
Three Dimensional Dynamic Model of TEHD Tilting Pad Journal Bearing—Part II: Parametric Studies
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper presents a new analysis method for a thermoelastohydrodynamic (TEHD) tilting pad journal bearing (TPJB) system to reach a static equilibrium condition adopting nonlinear transient dynamic solver, whereas earlier ...
Solid Element Rotordynamic Modeling of a Rotor on a Flexible Support Structure Utilizing Multiple-Input and Multiple-Output Support Transfer Functions
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The authors present an improved modeling approach to analyze the coupled rotor-support dynamics by modeling the rotor with solid finite elements (FEs) and utilizing multiple-input and multiple-output transfer functions ...
Double Overhung Disk and Parameter Effect on Rotordynamic Synchronous Instability—Morton Effect—Part II: Occurrence and Prevention
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper performs the parametric studies corresponding with the theoretical Morton effect (ME) model explained in Part I of this paper, where the fully nonlinear transient analysis based on the finite element method is ...