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RISDiscussion: “Damping and Inertia Coefficients for Two End Sealed Squeeze Film Dampers With a Central Groove: Measurements and Predictions†(authored by San Andrأ©s, L., and Seshagiri, S.)
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The model used by the authors for comparisons with measurement is based on the Reynolds equation in the thin film and on a simplified equation of the flow inside the feeding groove. The model of the feeding groove flow ...
Thermogasodynamic Analysis of the Segmented Annular Seal
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The present work deals with the thermogasodynamic analysis of the segmented annular seal provided with Rayleigh pockets. The paper is a continuation of the work presented Arghir, M., and Mariot, A. (2017, “Theoretical ...
Theoretical Analysis of the Static Characteristics of the Carbon Segmented Seal
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The segmented carbon seal is regularly used for sealing bearing chambers of aeronautical turboengines or as part of a buffer seal in space turbopumps. The seal operates with contaminated air or with an inert gas and is ...
About the Negative Direct Static Stiffness of Highly Eccentric Straight Annular Seals
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Experimental results indicating negative direct static stiffness of highly eccentric straight gas annular seals were very recently presented by Childs and Arthur (2013, “Static Destabilizing Behavior for Gas Annular Seals ...
Numerical Analysis of the Impact of Manufacturing Errors on the Structural Stiffness of Foil Bearings
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The dynamic characteristics of foil bearings operating at high rotation speeds depend very much on the mechanical characteristics of the foil structure. For this reason, the stiffness and damping of the structure of foil ...
Theoretical Analysis of Brush Seals Leakage Using Local Computational Fluid Dynamics Estimated Permeability Laws
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Brush seals are a mature technology that has generated extensive experimental and theoretical work. Theoretical models range from simple correlations with experimental results to advanced numerical approaches coupling the ...
Effect of Piston Ring Grooves on the Radial and Tangential Forces of a Squeeze Film Damper
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Squeeze film dampers (SFDs) are components of rotating machinery used to reduce vibration amplitudes and improve the rotor dynamic stability. Piston rings (PRs) are often employed as end seals for SFDs. They enhance the ...
A New Approach for the Stability Analysis of Rotors Supported by Gas Bearings
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A simplified nonlinear transient analysis method for gas bearings was recently published by the authors (Hassini, M. A., and Arghir, M., 2012, “Simplified Nonlinear Transient Analysis Method for Gas Bearings,†J. ...
Phase Change and Choked Flow Effects on Rotordynamic Coefficients of Cryogenic Annular Seals
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The present work deals with the numerical analysis of phase change effects and choked flow on the rotordynamic coefficients of cryogenic annular seals. The analysis is based on the “bulk flow†equations, with the energy ...
A Simplified and Consistent Nonlinear Transient Analysis Method for Gas Bearing: Extension to Flexible Rotors
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A simplified, new method for evaluating the nonlinear fluid forces in air bearings was recently proposed (Hassini, M. A., and Arghir, M., 2012, “Simplified Nonlinear Transient Analysis Method for Gas Bearings,†ASME ...