Dynamics Of Rotors On Refrigerant Lubricated Gas Foil Bearings
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Dynamics Of Rotors On Refrigerant Lubricated Gas Foil Bearings
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Author : Leister, Tim
language : en
Publisher: KIT Scientific Publishing
Release Date : 2021-10-28
Dynamics Of Rotors On Refrigerant Lubricated Gas Foil Bearings written by Leister, Tim and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-10-28 with Technology & Engineering categories.
The gas foil bearing (GFB) technology is a key factor for the transition to oil-free rotating machinery. Among numerous advantages, GFBs offer the unique ability to be lubricated with working fluids such as refrigerants. However, the computational analysis of refrigerant-lubricated GFB–rotor systems represents an interdisciplinary problem of enormous complexity. This work pushes forward existing limits of feasibility and establishes a new strategy that enables stability and bifurcation analyses.
Advances In Active Bearings In Rotating Machinery
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Author : Athanasios Chasalevris
language : en
Publisher: Springer Nature
Release Date : 2023-06-26
Advances In Active Bearings In Rotating Machinery written by Athanasios Chasalevris and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-06-26 with Technology & Engineering categories.
This book reports on cutting-edge experimental and numerical findings related to the application of active bearings, including smart ones, in rotating machinery. It discusses their role in improving stability and control of rotor systems and reports in depth on the corresponding modeling and control approaches. Chapters are based on peer-reviewed contributions to the 1st Workshop on Active Bearings in Rotating Machinery (ABROM 2022), held on June 29- 30, 2022, in Athens, Greece, and organized in collaboration between the School of Mechanical Engineering of The National Technical University of Athens (NTUA) and the Faculty of Mechanical Engineering of Karlsruhe Institute of Technology (KIT). In connection with the increasing digital transformation of machine elements, this book offers a timely perspective and extensive information on testing methods and experimental procedures involved in the development of intelligent rotors for industrial applications.
On The Influence Of Piecewise Defined Contact Geometries On Friction Dampers
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Author : Aramendiz Fuentes, Jimmy Alberto
language : en
Publisher: KIT Scientific Publishing
Release Date : 2023-09-12
On The Influence Of Piecewise Defined Contact Geometries On Friction Dampers written by Aramendiz Fuentes, Jimmy Alberto and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-09-12 with categories.
This work considers dampers that do not solely focus on a single strategy but instead combine them. The capabilities of conventional dry friction dampers are expanded by taking into account piecewise defined contact geometries. This leads to friction dampers that change their behavior depending on the amplitude of the oscillations. The vibration damping device in this work, introduces damping at high oscillation amplitudes and takes advantage of absorption at low oscillation amplitudes.
Rotordynamics Of Gas Lubricated Journal Bearing Systems
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Author : Krzysztof Czolczynski
language : en
Publisher: Springer
Release Date : 2012-09-24
Rotordynamics Of Gas Lubricated Journal Bearing Systems written by Krzysztof Czolczynski and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-09-24 with Technology & Engineering categories.
A discussion of models for the behaviour of gas bearings, particularly of the aspects affecting the stability of the system. The text begins with a discussion of the mathematical models, identifying the stiffness and damping coefficients, and describing the behaviour of the models in unstable regions. It then turns to apply these results to bearings: static characteristics and stability of various rotor systems and an extensive discussion of air rings.
Dynamic Behavior Of Air Lubricated Pivoted Pad Journal Bearing Rotor System
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Author : Zolton N. Nemeth
language : en
Publisher:
Release Date : 1970
Dynamic Behavior Of Air Lubricated Pivoted Pad Journal Bearing Rotor System written by Zolton N. Nemeth and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with Bearings (Machinery) categories.
Foil Bearings For Axial And Radial Support Of High Speed Rotors
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Author : L. Licht
language : en
Publisher:
Release Date : 1978
Foil Bearings For Axial And Radial Support Of High Speed Rotors written by L. Licht and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Bearings (Machinery) categories.
Flexible-surface thrust and journal foil-bearings of novel design were fabricated, and their performance was convincingly demonstrated, both individually and jointly as a unified rotor-support system. A versatile rig was constructed and instrumented, and experimental results are copiously documented with graphs and oscilloscopic data of trajectories, waveforms, and scans of amplitude response. The thrust bearings combine advantages of surface compliance with the superior load capacity of the spiral-groove configuration. The flexible supports provide means of deliberate control of clearance topography, in contrast to bearings in which the formation of the lubricating wedge is casual and incidental. At speeds of 40,000 to 45,000 rpm and a mean clearance of the order of 15 to 20 micrometers (600 to 800 micro in.), the resilient, air-lubricated, spiral-groove thrust bearings comfortably support a load of 127 N (29 lb; 13 kgf), equivalent to 3.0 N/sq. cm. (4.5 lb/sq in, 0.31 kgf/sq cm). The construction of journal foil-bearings is extremely simple. In one design, a coiled ribbon of plane foil and a retaining cartridge constitute the only components. In another design, the plane foil is integral with a section preformed to an open octagon with rounded vertices. A radical departure from operational characteristics of rigid gas bearings is achieved.
Dynamic Behavior Of Air Lubricated Pivoted Pad Journal Bearing Rotor System Pivoted Consideration And Pad Mass
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Author : Zolton N. Nemeth
language : en
Publisher:
Release Date : 1972
Dynamic Behavior Of Air Lubricated Pivoted Pad Journal Bearing Rotor System Pivoted Consideration And Pad Mass written by Zolton N. Nemeth and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with Bearings (Machinery) categories.
Research And Development Of High Temperature Gas Bearings Volume 1 Analysis And Design Of Three Gas Bearings For High Temperature Operation
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Author :
language : en
Publisher:
Release Date : 1969
Research And Development Of High Temperature Gas Bearings Volume 1 Analysis And Design Of Three Gas Bearings For High Temperature Operation written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1969 with categories.
Performance And Durability Of High Temperature Foil Air Bearings For Oil Free Turbomachinery
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Author : C. DellaCorte
language : en
Publisher:
Release Date : 2000
Performance And Durability Of High Temperature Foil Air Bearings For Oil Free Turbomachinery written by C. DellaCorte and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Nickel alloys categories.
The performance and durability of advanced, high temperature foil air bearings are evaluated under a wide range (10-50 kPa) of loads at temperatures from 25 to 650 deg C. The bearings are made from uncoated nickel based superalloy foils. The foil surface experiences sliding contact with the shaft during initial start/stop operation. To reduce friction and wear, the solid lubricant coating, PS 304, is applied to the shaft by plasma spraying. PS304 is a NiCr based Cr2O3 coating with silver and barium fluoride/calcium fluoride solid lubricant additions. The results show that the bearings provide lives well in excess of 30,000 cycles under all of the conditions tested. Several bearings exhibited lives in excess of 100,000 cycles. Wear is a linear function of the bearing load. The excellent performance measured in this study suggests that these bearings and the PS 304 coating are well suited for advanced high temperature, oil-free turbomachinery applications.
Thermomechanischer Kontakt Und Stochastische Dynamik Gleitender K Rper Mit Rauen Oberfl Chen
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Author : Oestringer, Lukas Julian
language : de
Publisher: KIT Scientific Publishing
Release Date : 2023-06-28
Thermomechanischer Kontakt Und Stochastische Dynamik Gleitender K Rper Mit Rauen Oberfl Chen written by Oestringer, Lukas Julian and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-06-28 with categories.
In dieser Arbeit wird der Reibwert für den trockenen Kontakt zweier gleitender metallischer Körper in Abhängigkeit verschiedener physikalischer Parameter berechnet. Dafür wird ein thermomechanisches Modell entwickelt und für verschiedene Kontaktkonfigurationen unter Berücksichtigung der Oberflächenrauigkeit beider Kontaktkörper ausgewertet. Darüber hinausgehende Untersuchungen zu den Auswirkungen des berechneten Reibwerts im Kontext von reibungserregten Schwingungen schließen sich an. - Within this work, the friction coefficient is calculated for the dry contact of two sliding metallic bodies as a function of various physical parameters. For this purpose, a thermomechanical model is developed and evaluated for different contact configurations considering the surface roughness of both contact bodies. Subsequent investigations on the consequences of the calculated friction coefficient in the context of friction-induced vibrations are carried out.