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Author : Dennis Fuk-Kuen Li
Publisher :
ISBN 13 :
Total Pages : 164 pages
Book Rating : 4.X/5 (4 download)
Download or read book Linear stability analysis of dual-rotor systems written by Dennis Fuk-Kuen Li and published by . This book was released on 1978 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : K. D. Gupta (Writer on rotors)
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (137 download)
Download or read book Stability Analysis of Dual Rotor System by Extended Transfer Matrix Method written by K. D. Gupta (Writer on rotors) and published by . This book was released on 1989 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper presents a general formulation for the stability problem of a linear model of dual rotor system with intershaft bearing(s) employing an ‘extended’ transfer matrix method [9] using complex variables. The stability criterion employed is essentially an extension of leonhard’s stability criterion. An alternative concept of ‘margin of stability’ has been suggested. In contrast to other methods, the present formulation maintains the integrity of dual rotor system in totality, by considering exact junction conditions at intershaft bearing. And it is felt that it would prove to be an potential method for analyzing the stability of complex rotor systems.
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781723194047
Total Pages : 126 pages
Book Rating : 4.1/5 (94 download)
Download or read book Linear and Nonlinear Dynamic Analysis of Redundant Load Path Bearingless Rotor Systems written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-18 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this research is to develop the transfer matrix method to treat nonlinear autonomous boundary value problems with multiple branches. The application is the complete nonlinear aeroelastic analysis of multiple-branched rotor blades. Once the development is complete, it can be incorporated into the existing transfer matrix analyses. There are several difficulties to be overcome in reaching this objective. The conventional transfer matrix method is limited in that it is applicable only to linear branch chain-like structures, but consideration of multiple branch modeling is important for bearingless rotors. Also, hingeless and bearingless rotor blade dynamic characteristics (particularly their aeroelasticity problems) are inherently nonlinear. The nonlinear equations of motion and the multiple-branched boundary value problem are treated together using a direct transfer matrix method. First, the formulation is applied to a nonlinear single-branch blade to validate the nonlinear portion of the formulation. The nonlinear system of equations is iteratively solved using a form of Newton-Raphson iteration scheme developed for differential equations of continuous systems. The formulation is then applied to determine the nonlinear steady state trim and aeroelastic stability of a rotor blade in hover with two branches at the root. A comprehensive computer program is developed and is used to obtain numerical results for the (1) free vibration, (2) nonlinearly deformed steady state, (3) free vibration about the nonlinearly deformed steady state, and (4) aeroelastic stability tasks. The numerical results obtained by the present method agree with results from other methods. Murthy, V. R. and Shultz, Louis A. Unspecified Center AEROELASTICITY; BEARINGLESS ROTORS; BOUNDARY VALUE PROBLEMS; DYNAMIC STRUCTURAL ANALYSIS; MATRIX METHODS; NONLINEAR EQUATIONS; ROTOR DYNAMICS; DIFFERENTIAL EQUATIONS; EQUATIONS OF MOTION; FREE VIBRATION; HOVERING; NEWTON-RAPHSON METHOD; RESONANT FRE...
Author : Yukio Ishida
Publisher : John Wiley & Sons
ISBN 13 : 3527651918
Total Pages : 495 pages
Book Rating : 4.5/5 (276 download)
Download or read book Linear and Nonlinear Rotordynamics written by Yukio Ishida and published by John Wiley & Sons. This book was released on 2013-03-05 with total page 495 pages. Available in PDF, EPUB and Kindle. Book excerpt: A wide-ranging treatment of fundamental rotordynamics in order to serve engineers with the necessary knowledge to eliminate various vibration problems. New to this edition are three chapters on highly significant topics: Vibration Suppression - The chapter presents various methods and is a helpful guidance for professional engineers. Magnetic Bearings - The chapter provides fundamental knowledge and enables the reader to realize simple magnetic bearings in the laboratory. Some Practical Rotor Systems - The chapter explains various vibration characteristics of steam turbines and wind turbines. The contents of other chapters on Balancing, Vibrations due to Mechanical Elements, and Cracked Rotors are added to and revised extensively. The authors provide a classification of rotating shaft systems and general coverage of key ideas common to all branches of rotordynamics. They offers a unique analysis of dynamical problems, such as nonlinear rotordynamics, self-excited vibration, nonstationary vibration, and flow-induced oscillations. Nonlinear resonances are discussed in detail, as well as methods for shaft stability and various theoretical derivations and computational methods for analyzing rotors to determine and correct vibrations. This edition also includes case studies and problems.
Author : Chong-Won Lee
Publisher : Springer Science & Business Media
ISBN 13 : 9401581738
Total Pages : 324 pages
Book Rating : 4.4/5 (15 download)
Download or read book Vibration Analysis of Rotors written by Chong-Won Lee and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text is intended for use as an advanced course in either rotordynamics or vibration at the graduate level. This text has mostly grown out of the research work in my laboratory and the lectures given to graduate students in the Mechanical Engineering Department, KAIST. The text contains a variety of topics not normally found in rotordynamics or vibration textbooks. The text emphasizes the analytical aspects and is thus quite different from conventional rotordynamics texts; potential readers are expected to have a firm background in elementary rotordynamics and vibration. In most previously published rotordynamics texts, the behavior of simple rotors has been of a primary concern, while more realistic, multi-degree-f-freedom or continuous systems are seldom treated in a rigorous way, mostly due to the difficulty of a mathematical treatment of such complicated systems. When one wanted to gain a deep insight into dynamic phenomena of complicated rotor systems, one has, in the past, either had to rely on computational techniques, such as the transfer matrix and finite element methods, or cautiously to extend ideas learned from simple rotors whose analytical solutions are readily available. The former methods are limited in the interpretation of results, since the calculations relate only to the simulated case, not to more general system behavior. Ideas learned from simple rotors can, fortunately, often be extended to many practical rotor systems, but there is of course no guarantee of their validity.
Author :
Publisher :
ISBN 13 :
Total Pages : 54 pages
Book Rating : 4.:/5 (317 download)
Download or read book Finite Element Stability Analysis for Coupled Rotor and Support Systems written by and published by . This book was released on 1977 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Yue Song
Publisher : Now Publishers
ISBN 13 : 9781680837780
Total Pages : 138 pages
Book Rating : 4.8/5 (377 download)
Download or read book Network-Based Analysis of Rotor Angle Stability of Power Systems written by Yue Song and published by Now Publishers. This book was released on 2020-11-26 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication provides new insights into some important problems in rotor angle stability that have not been well addressed by the traditional node-based approaches. It is a must-read for all students and researchers working on the cutting edge of electric power systems.
Author : Jing Ma
Publisher : John Wiley & Sons
ISBN 13 : 1119304865
Total Pages : 520 pages
Book Rating : 4.1/5 (193 download)
Download or read book Power System Wide-area Stability Analysis and Control written by Jing Ma and published by John Wiley & Sons. This book was released on 2018-05-10 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt: An essential guide to the stability and control of power systems integrating large-scale renewable energy sources The rapid development of smart grids and the integration of large scale renewable energy have added daunting new layers of complexity to the long-standing problem of power system stability control. This book offers a systematic stochastic analysis of these nonlinear problems and provides comprehensive countermeasures to improve power system performance and control with large-scale, hybrid power systems. Power system stability analysis and control is by no means a new topic. But the integration of large scale renewable energy sources has added many new challenges which must be addressed, especially in the areas of time variance, time delay, and uncertainties. Robust, adaptive control strategies and countermeasures are the key to avoiding inadequate, excessive, or lost loads within hybrid power systems. Written by an internationally recognized innovator in the field this book describes the latest theory and methods for handling power system angle stability within power networks. Dr. Jing Ma analyzes and provides control strategies for large scale power systems and outlines state-of-the-art solutions to the entire range of challenges facing today’s power systems engineers. Features nonlinear, stochastic analysis of power system stability and control Offers proven countermeasures to optimizing power system performance Focuses on nonlinear time-variance, long time-delays, high uncertainties and comprehensive countermeasures Emphasizes methods for analyzing and addressing time variance and delay when integrating large-scale renewable energy Includes rigorous algorithms and simulations for the design of analysis and control modeling Power System Wide-area Stability Analysis and Control is must-reading for researchers studying power system stability analysis and control, engineers working on power system dynamics and stability, and graduate students in electrical engineering interested in the burgeoning field of smart, wide-area power systems.
Author : Walter M. Wirth
Publisher :
ISBN 13 :
Total Pages : 183 pages
Book Rating : 4.:/5 (122 download)
Download or read book Linear Modeling of Rotorcraft for Stability Analysis and Preliminary Design written by Walter M. Wirth and published by . This book was released on 1993 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Krishnaswamy Ramesh
Publisher :
ISBN 13 :
Total Pages : 440 pages
Book Rating : 4.:/5 (357 download)
Download or read book Advanced Analysis of Rotor-bearing Systems for Stability and Response written by Krishnaswamy Ramesh and published by . This book was released on 1996 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Rajiv Tiwari
Publisher : CRC Press
ISBN 13 : 1351863630
Total Pages : 1225 pages
Book Rating : 4.3/5 (518 download)
Download or read book Rotor Systems written by Rajiv Tiwari and published by CRC Press. This book was released on 2017-11-22 with total page 1225 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this book is to give a basic understanding of rotor dynamics phenomena with the help of simple rotor models and subsequently, the modern analysis methods for real life rotor systems. This background will be helpful in the identification of rotor-bearing system parameters and its use in futuristic model-based condition monitoring and, fault diagnostics and prognostics. The book starts with introductory material for finite element methods and moves to linear and non-linear vibrations, continuous systems, vibration measurement techniques, signal processing and error analysis, general identification techniques in engineering systems, and MATLAB analysis of simple rotors. Key Features: • Covers both transfer matrix methods (TMM) and finite element methods (FEM) • Discusses transverse and torsional vibrations • Includes worked examples with simplicity of mathematical background and a modern numerical method approach • Explores the concepts of instability analysis and dynamic balancing • Provides a basic understanding of rotor dynamics phenomena with the help of simple rotor models including modern analysis methods for real life rotor systems.
Author :
Publisher :
ISBN 13 :
Total Pages : 476 pages
Book Rating : 4.:/5 (32 download)
Download or read book Rotordynamic Instability Problems in High-performance Turbomachinery, 1990 written by and published by . This book was released on 1991 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : O. Mahrenholtz
Publisher : Springer
ISBN 13 : 3709128129
Total Pages : 501 pages
Book Rating : 4.7/5 (91 download)
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:
Author : Afifa Adel Zaki
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (81 download)
Download or read book Using Tightly-coupled CFD/CSD Simulation for Rotorcraft Stability Analysis written by Afifa Adel Zaki and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamic stall deeply affects the response of helicopter rotor blades, making its modeling accuracy very important. Two commonly used dynamic stall models were implemented in a comprehensive code, validated, and contrasted to provide improved analysis accuracy and versatility. Next, computational fluid dynamics and computational structural dynamics loose coupling methodologies are reviewed, and a general tight coupling approach was implemented and tested. The tightly coupled computational fluid dynamics and computational structural dynamics methodology is then used to assess the stability characteristics of complex rotorcraft problems. An aeroelastic analysis of rotors must include an assessment of potential instabilities and the determination of damping ratios for all modes of interest. If the governing equations of motion of a system can be formulated as linear, ordinary differential equations with constant coefficients, classical stability evaluation methodologies based on the characteristic exponents of the system can rapidly and accurately provide the system's stability characteristics. For systems described by linear, ordinary differential equations with periodic coefficients, Floquet's theory is the preferred approach. While these methods provide excellent results for simplified linear models with a moderate number of degrees of freedom, they become quickly unwieldy as the number of degrees of freedom increases. Therefore, to accurately analyze rotorcraft aeroelastic periodic systems, a fully nonlinear, coupled simulation tool is used to determine the response of the system to perturbations about an equilibrium configuration and determine the presence of instabilities and damping ratios. The stability analysis is undertaken using an algorithm based on a Partial Floquet approach that has been successfully applied with computational structural dynamics tools on rotors and wind turbines. The stability analysis approach is computationally inexpensive and consists of post processing aeroelastic data, which can be used with any aeroelastic rotorcraft code or with experimental data.
Author :
Publisher :
ISBN 13 :
Total Pages : 704 pages
Book Rating : 4.0/5 ( download)
Download or read book ASME Technical Papers written by and published by . This book was released on 1983 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : L. Forrai
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (137 download)
Download or read book Stability Analysis of Symmetrical Rotor-bearing Systems with Internal Damping Using Finite Element Method written by L. Forrai and published by . This book was released on 1996 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presented at the International Gas Turbine and Aeroengine Congress & Exhibition, Birmingham, UK, Jun 10-13, 1996.
Author :
Publisher :
ISBN 13 :
Total Pages : 804 pages
Book Rating : 4.:/5 (26 download)
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1971 with total page 804 pages. Available in PDF, EPUB and Kindle. Book excerpt:
