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Unbalance Response Prediction For Accelerating Rotors With Load Dependent Nonlinear Bearing Stiffness
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721791590 Total Pages :30 pages Book Rating :4.7/5 (915 download)
Book Synopsis Unbalance Response Prediction for Accelerating Rotors with Load-Dependent Nonlinear Bearing Stiffness by : National Aeronautics and Space Administration (NASA)
Download or read book Unbalance Response Prediction for Accelerating Rotors with Load-Dependent Nonlinear Bearing Stiffness written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-24 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rolling-element bearing forces vary nonlinearly with bearing deflection. Thus an accurate rotordynamic analysis requires that bearing forces corresponding to the actual bearing deflection be utilized. Previous papers have explored the transient effect of suddenly applied imbalance and the steady-state unbalance response, using bearing forces calculated by the rolling-element bearing analysis code COBRA-AHS. The present work considers the acceleration of a rotor through one or more critical speeds. The rotordynamic analysis showed that for rapid acceleration rates the maximum response amplitude may be considerably less than predicted by steady-state analysis. Above the critical speed, transient vibration at the rotor natural frequency occurs, similar to that predicted for a Jeffcott rotor with constant-stiffness bearings. A moderate amount of damping will markedly reduce the vibration amplitude, but this damping is not inherent in ball bearings. Fleming, David P. and Sawicki, Jaezy T. and Poplawski, J. V. Glenn Research Center NASA/TM-2005-213801, E-15159
Book Synopsis Unbalance Response Prediction for Rotors on Ball Bearings Using Speed and Load Dependent Nonlinear Bearing Stiffness by :
Download or read book Unbalance Response Prediction for Rotors on Ball Bearings Using Speed and Load Dependent Nonlinear Bearing Stiffness written by and published by . This book was released on 2003 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Manufacturing Science and Technology, ICMST2011 by : Wu Fan
Download or read book Manufacturing Science and Technology, ICMST2011 written by Wu Fan and published by Trans Tech Publications Ltd. This book was released on 2011-11-22 with total page 7835 pages. Available in PDF, EPUB and Kindle. Book excerpt: Selected, peer reviewed papers from the 2011 International Conference on Manufacturing Science and Technology, (ICMST 2011), September 16-18, 2011, Singapore
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721590483 Total Pages :28 pages Book Rating :4.5/5 (94 download)
Book Synopsis Unbalance Response Prediction for Rotors on Ball Bearings Using Speed and Load Dependent Nonlinear Bearing Stiffness by : National Aeronautics and Space Administration (NASA)
Download or read book Unbalance Response Prediction for Rotors on Ball Bearings Using Speed and Load Dependent Nonlinear Bearing Stiffness written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-20 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rolling-element bearing forces vary nonlinearly with bearing deflection. Thus an accurate rotordynamic analysis requires that bearing forces corresponding to the actual bearing deflection be utilized. For this work bearing forces were calculated by COBRA-AHS, a recently developed rolling-element bearing analysis code. Bearing stiffness was found to be a strong function of bearing deflection, with higher deflection producing markedly higher stiffness. Curves fitted to the bearing data for a range of speeds and loads were supplied to a flexible rotor unbalance response analysis. The rotordynamic analysis showed that vibration response varied nonlinearly with the amount of rotor imbalance. Moreover, the increase in stiffness as critical speeds were approached caused a large increase in rotor and bearing vibration amplitude over part of the speed range compared to the case of constant bearing stiffness. Regions of bistable operation were possible, in which the amplitude at a given speed was much larger during rotor acceleration than during deceleration. A moderate amount of damping will eliminate the bistable region, but this damping is not inherent in ball bearings. Fleming, David P. and Poplawski, J. V. Glenn Research Center NASA/TM-2003-212527, E-14089, NAS 1.15:212527
Book Synopsis Dynamics of Rotating Machines by : M. I. Friswell
Download or read book Dynamics of Rotating Machines written by M. I. Friswell and published by Cambridge University Press. This book was released on 2010-03-31 with total page 545 pages. Available in PDF, EPUB and Kindle. Book excerpt: Enables engineers to understand the dynamics of rotating machines, from basic explanations to detailed numerical models and analysis.
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1986 with total page 1066 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dynamics of Rotating Systems by : Giancarlo Genta
Download or read book Dynamics of Rotating Systems written by Giancarlo Genta and published by Springer Science & Business Media. This book was released on 2007-01-04 with total page 674 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides an up-to-date review of rotor dynamics, dealing with basic topics as well as a number of specialized topics usually available only in journal articles Unlike other books on rotordynamics, this treats the entire machine as a system, with the rotor as just one component
Book Synopsis Dynamics of Rotors by : O. Mahrenholtz
Download or read book Dynamics of Rotors written by O. Mahrenholtz and published by Springer. This book was released on 2014-05-04 with total page 501 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dynamics of Rotors and Foundations by : Erwin Krämer
Download or read book Dynamics of Rotors and Foundations written by Erwin Krämer and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rotordynamics are of great importance in the design, manufacture and assembly of turbomachines as well as in ensuring their safe operation. Also important are the dynamics of the foundation and its interaction with the dynamics of the rotor. This book is divided into four parts. Following a presentation of the basic theory the dynamics of rotors supported on several bearings. The third part describes the dynamics of foundations of turbine line-outs and the calculations for a turbomachine coupled with its foundation. The last part includes a section on estimation procedures, a comprehensive presentation of the theoryand practice of rotors having a transverse crack, a section on the mathematical fundamentals and a description of the computer program used for the examples in the book. The book addresses both the practical engineer and the theoretician and should provide manufacturers, operators, university and polytechnic lecturers and students with an understanding of the vibrations of turbomachines. The results are described in such a way that they can be easily understood and applied.
Book Synopsis Rotordynamics of Turbomachinery by : John M. Vance
Download or read book Rotordynamics of Turbomachinery written by John M. Vance and published by John Wiley & Sons. This book was released on 1991-01-16 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes the rotordynamic considerations that are important to the successful design or troubleshooting of a turbomachine. Shows how bearing design, fluid seals, and rotor geometry affect rotordynamic behavior (vibration, shaft whirling, bearing loads, and critical speeds), and describes two successful computational methods for rotordynamic analysis in terms that can be understood by practicing engineers. Gives descriptive accounts of the state of the art in several areas of the field and presents important mathematical or computational concepts, describing equations and formulas in physical terms for better understanding. Also offers tips for troubleshooting unstable machines and provides practical interpretations of vibration measurements.
Book Synopsis Harmonic Balance for Nonlinear Vibration Problems by : Malte Krack
Download or read book Harmonic Balance for Nonlinear Vibration Problems written by Malte Krack and published by Springer. This book was released on 2019-03-23 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph presents an introduction to Harmonic Balance for nonlinear vibration problems, covering the theoretical basis, its application to mechanical systems, and its computational implementation. Harmonic Balance is an approximation method for the computation of periodic solutions of nonlinear ordinary and differential-algebraic equations. It outperforms numerical forward integration in terms of computational efficiency often by several orders of magnitude. The method is widely used in the analysis of nonlinear systems, including structures, fluids and electric circuits. The book includes solved exercises which illustrate the advantages of Harmonic Balance over alternative methods as well as its limitations. The target audience primarily comprises graduate and post-graduate students, but the book may also be beneficial for research experts and practitioners in industry.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Introduction to Dynamics of Rotor-bearing Systems by : Wen Jeng Chen
Download or read book Introduction to Dynamics of Rotor-bearing Systems written by Wen Jeng Chen and published by Trafford on Demand Pub. This book was released on 2007 with total page 469 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is written as an introduction to rotor-bearing dynamics for practicing engineers and students who are involved in rotordynamics and bearing design. The goal of this book is to provide a step-by-step approach to the understanding of fundamentals of rotor-bearing dynamics by using DyRoBeS(c) . Therefore, the emphasis of this book is on the basic principals, phenomena, modeling, and interpretation of the results. Numerous examples, from a single-degree-of-freedom system to complicated industrial rotating machinery, are employed throughout this book to illustrate these fundamental dynamic behaviors. The concepts in the text are reinforced by parametric studies and numerous illustrative examples and figures. The book begins with a brief discussion of the mathematical modeling of physical dynamic systems and an overview of the basic vibration concepts in Chapter 1. The coordinate systems and the kinematics of the rotor motion are presented in Chapter 2. A simple two-degrees-of-freedom rotor system, the Laval-Jeffcott rotor model, is utilized in Chapter 3 to demonstrate many important phenomena in rotordynamics. This simple 2DOF model provides many valuable physical insights into more practical and complicated systems. Chapter 4 discusses the rotating disk equations and rigid rotor dynamics. Chapter 5 covers the finite element formulation for a rotating shaft element. Chapter 6 deals with various types of bearings, dampers, seals and other interconnection components. All the reaction forces from these components are non-linear in nature. The concept of linearization around the static equilibrium is discussed. Chapter 7 summarizes the lateral vibration study with several practical examples. Various solution techniques and interpretation of the results are discussed. Chapter 8 is devoted to the important subject of torsional vibration. Finally, a brief description of the balancing method, influence coefficient method is presented in Chapter 9.
Download or read book ASME Technical Papers written by and published by . This book was released on 1998 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Paper written by and published by . This book was released on 1998 with total page 796 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Rotordynamics by : Agnieszka Muszynska
Download or read book Rotordynamics written by Agnieszka Muszynska and published by CRC Press. This book was released on 2005-05-20 with total page 1100 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the most important parts of rotating machinery, rotors are also the most prone to mechanical vibrations, which may lead to machine failure. Correction is only possible when proper and accurate diagnosis is obtained through understanding of rotor operation and all of the potential malfunctions that may occur. Mathematical modeling, in particular
Book Synopsis Torsional Vibration of Turbo-Machinery by : Duncan Walker
Download or read book Torsional Vibration of Turbo-Machinery written by Duncan Walker and published by McGraw Hill Professional. This book was released on 2003-11-21 with total page 209 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vibration, excessive noise and other dynamics-related problems that limit or prevent operation are a major manufacturing concern in airplanes, auto crankshafts, home appliances, etc. This detailed monograph provides in-depth coverage of state-of-the-art vibration analysis techniques used to prevent design and operational malfunction. * Torsional vibration mathematical modeling * Forced response analysis * Vibration measurement methods and monitoring * Application case studies * SI units used throughout
