Tilt Pad Bearing Effects on Rotordynamic Stability and Improvements in Global System Dynamic Analysis PDF Download
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Author: Larry Lee Earles
Publisher:
ISBN:
Category : Fluid-film bearings
Languages : en
Pages : 592
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Book Description
Author: Larry Lee Earles
Publisher:
ISBN:
Category : Fluid-film bearings
Languages : en
Pages : 592
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Book Description
Author: Jinsang Kim
Publisher:
ISBN:
Category : Bearings (Machinery)
Languages : en
Pages : 348
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Book Description
Author: Kyu-Ho Sim
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Rotordynamic and thermal analyses of compliant flexure pivot tilting pad gas bearings were performed. First, compliant flexure pivot tilting pad gas bearings with pad radial compliance (CFTPBs) were introduced and designed for high-speed oil-free micro turbomachinery. The pad radial compliance was for accommodation of large rotor growth at high speeds. Parametric studies on pivot offset, preload, and tilting stiffness were performed using non-linear orbit simulations and coast-down simulations for an optimum design. Second, coast-down tests for imbalance response and stability of typical rotor-bearing system with a rigid rotor and two CFTPBs designed from the above design studies were conducted over operating speeds up to 55 krpm. Prediction of synchronous rotordynamic responses was made in terms of critical speed for various imbalance modes by using a rotordynamic analysis software (XLTRC), combined with dynamic force coefficients from the perturbation analysis. For stability analyses, a generalized orbit simulation program was developed considering both the translational and angular rotor motions with two different bearings. Linear stability analyses for the conical vibration mode were also performed by using XLTRC and the perturbation analysis based on the Lund method. Predictions of whirl speed showed good agreement to the tests, but the estimated onset speed of instability appeared lower than the measured instability. Finally, a new thermo-hydrodynamic analysis model of a typical rotor-bearing system with CFTPBs was presented, accompanying linear perturbation analyses to investigate thermal effects on the rotordynamic performance. A numerical procedure was established for solving the generalized Reynolds equation, the 3-D energy equation, and the associated boundary conditions at the pad inlet flow and solid walls (rotor and pad) simultaneously. Parametric studies were conducted on nominal clearance and external load. Nominal clearance showed significant influence on temperature fields, and external load had uneven thermal effects among pads. Case studies with heat flux and temperature boundary conditions on the rotor end surface were performed to simulate various working conditions of the bearing. Large rotor thermal growth due to the high rotor temperature showed noticeable influence on rotordynamic performance by increasing direct stiffness and damping coefficients.
Author: Zolton N. Nemeth
Publisher:
ISBN:
Category : Bearings (Machinery)
Languages : en
Pages : 52
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Book Description
Author: J. S. Rao
Publisher: Springer Nature
ISBN: 9811557012
Category : Technology & Engineering
Languages : en
Pages : 605
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Book Description
This book presents select papers presented during the 6th National Symposium on Rotor Dynamics, held at CSIR-NAL, Bangalore, and focuses on the latest trends in rotor dynamics and various challenges encountered in the design of rotating machinery. The book is of interest to researchers from mechanical, aerospace, tribology and power industries, engineering service providers and academics.
Author: Zolton N. Nemeth
Publisher:
ISBN:
Category : Bearings (Machinery)
Languages : en
Pages : 36
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Book Description
Author: K. W. Wang
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 396
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Book Description
Author: Blake W. Wilson
Publisher:
ISBN:
Category : Eigenvalues
Languages : en
Pages : 236
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Book Description
Author: Athanasios Chasalevris
Publisher: Springer Nature
ISBN: 3031323947
Category : Technology & Engineering
Languages : en
Pages : 218
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Book Description
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.
Author: Edgar J. Gunter (Jr.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 240
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Book Description
