Relevant bibliographies by topics / Radial static unbalance of the rotor

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Radial static unbalance of the rotor'

Author: Grafiati
Published: 28 May 2022
Last updated: 31 July 2025

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Journal articles on the topic "Radial static unbalance of the rotor"

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Meeus, Hans, Jakob Fiszer, Gabriël Van De Velde, et al. "Dynamic Performance of a Squeeze Film Damper with a Cylindrical Roller Bearing under a Large Static Radial Loading Range." Machines 7, no. 1 (2019): 14. http://dx.doi.org/10.3390/machines7010014.

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Turbomachine rotors, supported by little damped rolling element bearings, are generally sensitive to unbalance excitation. Accordingly, most machines incorporate squeeze film damper technology to dissipate mechanical energy caused by rotor vibrations and to ensure stable operation. When developing a novel geared turbomachine able to cover a large power range, a uniform mechanical drivetrain needs to perform well over the large operational loading range. Especially, the rotor support, containing a squeeze film damper and cylindrical roller bearing in series, is of vital importance in this respe
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Martsynkovskyy, Volodymyr, Oleksii Zhulov, and Czeslaw Kundera. "Analysis of the Radial-Axial Oscillations of the Rotor of a High-Speed Pump." Applied Mechanics and Materials 630 (September 2014): 341–49. http://dx.doi.org/10.4028/www.scientific.net/amm.630.341.

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The joint radial-axial oscilations of onemass model of rotor of high-speed pump are considered taking into account hydrodynamic forces, arising up in the radial clearance of annular seals. Connection of axial oscilations with radial is conditioned by dependence of conductivity of annular throttle, consequently, and axial force of balancing device, from the excentricity of shaft in the annular collar. amplitude and phase frequency characteristics of the forced oscilations, excited by harmonically changing pressure and static unbalance.
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Nässelqvist, Mattias, Rolf Gustavsson, and Jan-Olov Aidanpää. "Experimental and Numerical Simulation of Unbalance Response in Vertical Test Rig with Tilting-Pad Bearings." International Journal of Rotating Machinery 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/309767.

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In vertically oriented machines with journal bearing, there are no predefined static radial loads, such as dead weight for horizontal rotor. Most of the commercial software is designed to calculate rotordynamic and bearing properties based on machines with a horizontally oriented rotor; that is, the bearing properties are calculated at a static eccentricity. For tilting-pad bearings, there are no existing analytical expressions for bearing parameters and the bearing parameters are dependent on eccentricity and load angle. The objective of this paper is to present a simplified method to perform
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Natesan, Sivaramakrishnan, Karuna Kalita та Venkatesu Samala. "Numerical and Experimental Investigation of Bridge Currents of an Induction Machine Equipped with Bridge Configured Winding". International Journal of Electrical and Computer Engineering (IJECE) 5, № 6 (2015): 1262. http://dx.doi.org/10.11591/ijece.v5i6.pp1262-1274.

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<p class="CM1">An eccentric rotor motion imbalances the magnetic field distribution in the air-gap region. Due to this uneven flux density distribution, a net radial force called Unbalanced Magnetic Pull (UMP) is in action towards the shortest air-gap. This UMP can degrade the machine’s performance. UMP can be controlled by a special kind of winding called Bridge Configured Winding (BCW). The BCW winding is a single set of winding which is used to produce the torque as well as the controllable force. The main contribution of this paper is to inspect the flow of bridge currents in the bridges
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Yang, Zebin, Xi Chen, Xiaodong Sun, Chunfeng Bao, and Jiang Lu. "Rotor radial disturbance control for a bearingless induction motor based on improved active disturbance rejection control." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 38, no. 1 (2019): 138–52. http://dx.doi.org/10.1108/compel-05-2018-0217.

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Purpose The purpose of this paper is to handle the problem of the radial disturbance caused by rotor mass unbalance and load change in a bearingless induction motor (BIM). Design/methodology/approach The active disturbance rejection controller (ADRC) is used to replace the traditional PI controller, and a cubic interpolation method is used to fit the nonlinear function of ADRC, so as to improve the control performance. Meanwhile, a disturbance observer is applied to the suspension system, and the observed disturbance acceleration is compensated to the suspension system in the form of current;
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Zhao, J. Y., I. W. Linnett, and L. J. McLean. "Subharmonic and Quasi-Periodic Motions of an Eccentric Squeeze Film Damper-Mounted Rigid Rotor." Journal of Vibration and Acoustics 116, no. 3 (1994): 357–63. http://dx.doi.org/10.1115/1.2930436.

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When a squeeze-film damper is operated eccentrically, the nonlinear damper forces are no longer radially symmetric and subharmonic and quasi-periodic vibrations may be excited by the rotor unbalance. In this study, the unbalance response of a rigid rotor, supported on an eccentric squeeze film damper, is first approximated by a harmonic series whose coefficients are determined by the collocation method, together with a nonlinear least-square regression. The stability of the resulting periodic solution is then examined using the Floquet transition matrix method. For sufficiently large values of
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Mahdiuon-Rad, S., S. R. Mousavi-Aghdam, M. Reza Feyzi, and M. B. B. Sharifian. "Analysis of PM Magnetization Field Effects on the Unbalanced Magnetic Forces due to Rotor Eccentricity in BLDC Motors." Engineering, Technology & Applied Science Research 3, no. 4 (2013): 461–66. http://dx.doi.org/10.48084/etasr.296.

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This paper investigates both static and dynamic eccentricities in single phase brushless DC (BLDC) motors and analyzes the effect of the PM magnetization field on unbalanced magnetic forces acting on the rotor. Three common types of PM magnetization field patterns including radial, parallel and sinusoidal magnetizations are considered. In both static and dynamic eccentricities, harmonic components of the unbalanced magnetic forces on the rotor are extracted and analyzed. Based on simulation results, the magnetization fields that produce the lowest and highest unbalanced magnetic forces are det
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He, Yu-Ling, Meng-Qiang Ke, Fa-Lin Wang, Gui-Ji Tang, and Shu-Ting Wan. "EFFECT OF STATIC ECCENTRICITY AND STATOR INTER-TURN SHORT CIRCUIT COMPOSITE FAULT ON ROTOR VIBRATION CHARACTERISTICS OF GENERATOR." Transactions of the Canadian Society for Mechanical Engineering 39, no. 4 (2015): 767–81. http://dx.doi.org/10.1139/tcsme-2015-0061.

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This paper investigates the radial rotor vibration characteristics under static air-gap eccentricity and stator inter-turn short circuit composite faults. The air-gap magnetic flux density is firstly deduced to obtain the unbalanced magnetic pull (UMP) on rotor. Then the rotor vibration characters, as well as the developing trend between the faulty parameters and the vibration amplitudes, are analyzed. Finally, the experiments are taken on a SDF-9 type simulating generator. It is shown that the radial deformation possibility, the 2nd, 4th, and 6th harmonic vibrations will be caused by the comp
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Goroshko, Andrii, Maryna Zembytska, and Vadym Paiuk. "Induction Motor Vibrations Caused by Mechanical and Magnetic Rotor Eccentricity." Journal of Engineering Sciences 11, no. 1 (2024): D66—D77. http://dx.doi.org/10.21272/jes.2024.11(1).d8.

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Vibration reduction of induction motors is a significant problem that requires effective models for the effects of mechanical and electromagnetic unbalanced forces. This article presents a mathematical model of dynamics for induction motors with rotor mass eccentricity and static and dynamic magnetic eccentricity. The model allows for the influence of the gyroscopic torque of the rotor and considers the elastic-damping characteristics of each of the stator supports and their location. The model has eight degrees of freedom, which makes it possible to simulate transverse and axial vibrations of
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Goldman, Paul, Agnes Muszynska, and Donald E. Bently. "Thermal Bending of the Rotor Due to Rotor-to-Stator Rub." International Journal of Rotating Machinery 6, no. 2 (2000): 91–100. http://dx.doi.org/10.1155/s1023621x00000099.

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The rotor thermal bending due to the rotor-to-stator rubbing can lead to one of three types of observed rotor lateral motion: (1) spiral with increasing amplitude, (2) oscillating between rub]no-rub conditions, and (3) asymptotical approach to the rotor limit cycle. Based on the machinery observations, it is assumed in the analytical part of the paper that the speed scale of transient thermal effects is considerably lower than that of rotor vibrations, and that the thermal effect reflects only on the rotor steady-state vibrational response. This response would change due to thermally induced b
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Dissertations / Theses on the topic "Radial static unbalance of the rotor"

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Гарбар, О. О. "Аналіз радіально-осьових коливань однодискового ротора". Master's thesis, Сумський державний університет, 2018. http://essuir.sumdu.edu.ua/handle/123456789/71069.

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Мета роботи – проведення аналізу радіально-осьових коливань однодискового ротору, оцінка радіальної статичної неврівноваженості, пульсацій тиску нагнітання і гармонійних змін осьової сили, діючої на ротор, оцінка критичних частот обертання ротора і амплітуди його змушених коливань. Мета дослідження – розглянути осьові коливання ротора, обумовлені його радіальними коливаннями. Тут же виводяться лінеаризовані рівняння спільних радіально-осьових коливань найпростішої одномасової моделі жорсткого ротора з автоматичним врівноважувальним пристроєм. Диск має статичну неврівноваженість. Досліджуються
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Book chapters on the topic "Radial static unbalance of the rotor"

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Baum, Christoph, Hartmut Hetzler, and Wolfgang Seemann. "On the Dynamics of a Rigid Rotor with Static Unbalance Symmetrically Mounted in Compliant Air Bearings." In Proceedings of the 9th IFToMM International Conference on Rotor Dynamics. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06590-8_96.

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Conference papers on the topic "Radial static unbalance of the rotor"

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Horvath, Roland, George T. Flowers, and Jerry Fausz. "Passive Balancing for Rotor Systems Using Pendulum Balancers." In ASME 2005 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/detc2005-84194.

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An analytical, numerical and experimental investigation of the dynamic behavior of a passive balancing system is presented. Due to the system constraints and dynamic characteristics, this system is capable of combined static and dynamic mass balancing. This work is an extension of previous studies in which ball-balancing systems were used to reduce harmful vibration caused by radial perturbation in the principal axis of inertia. In the present research, the imbalance compensation problem is divided into axial and radial components. A spherical suspension was applied at the rotational axis that
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Ivanov, Ilya, Boris Blinnik, and Vladislav Myasnikov. "Nonlinear Reduced Dynamic Model of Turbofan Engine for Investigation of Engine Structural Frame Vibrations After Fan Blade Out Event." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90367.

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Abstract This paper proposes an approach to construct a nonlinear dynamic model of a whole turbofan engine using the static condensation technique. Nonlinear dynamic behavior of the engine is described by a matrix differential equation, where the right side of the equation represents unbalance load and contact loads between the blades and casings, low-pressure (LP) shaft and high-pressure shaft. Elements of the matrices are calculated by static condensation of three-dimensional finite element models of rotors, casings, engine mounts, and wing attachment system. On the basis of the proposed app
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Khorshid, E. A., and A. H. Falah. "Estimation of Rotor-Bearing Parameters by a Global Optimization Method." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-13336.

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Modeling, experiments and system identification of the linear dynamics of a flexible multi-bearing rotor with two concentrated disks are presented in this paper. Both rotor unbalanced vibration responses through critical speeds were experimentally obtained through accurate control of journal bearing static load. Vibration simulations of this laboratory rotor-bearing system were performed as a linear system. The simulation and the experimental results have large differences for both rotors. These differences occur because of (1)The errors in estimating the journal bearing damping and stiffness
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Cole, Matthew O. T., Chakkapong Chamroon, and Prinya Ngamprapasom. "Force Feedback Control for Active Stabilization of Synchronous Whirl Orbits in Rotor Systems With Non-Linear Stiffness Elements." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-23246.

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Synchronous vibration in rotor systems having bearings, seals or other elements with non-linear stiffness characteristics is prone to amplitude jump when operating close to critical speeds as there may be two or more possible whirl responses for a given unbalance condition. This paper describes research on the use of active control methods for eliminating this potentially undesirable behavior. A control scheme based on direct feedback of rotor-stator interaction forces is considered. Model based conditions for stability of low amplitude whirl, derived using Lyapunov’s direct method, are used a
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Zarzour, Mark, and John Vance. "Experimental Evaluation of a Metal Mesh Bearing Damper." In ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/99-gt-015.

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Metal mesh is a commercially available material used in many applications including seals, heat shields, filters, gaskets, aircraft engine mounts, and vibration absorbers. This material has been tested by the authors as a bearing damper in a rotordynamic test rig. The test facility was originally used to support the design of a turboprop engine, developing squirrel cages and squeeze film dampers for both the gas generator and power turbine rotors. To design the metal mesh damper, static stiffness and dynamic rap test measurements were first made on metal mesh samples in a specially designed no
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Lavagnoli, S., C. De Maesschalck, and V. Andreoli. "Design Considerations for Tip Clearance Control and Measurement on a Turbine Rainbow Rotor With Multiple Blade Tip Geometries." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-56544.

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The accurate design, control and monitoring of the running gaps between static and moving components is vital to preserve the mechanical integrity and ensure the correct functioning of any compact rotating machinery. Throughout engine service, the rotor tip clearance undergoes large variations due to installation tolerances or as the result of different thermal expansion rates of the blades, rotor disk and casing during speed transients. Hence, active tip clearance control concepts and engine health monitoring systems rely on precise real-time gap measurements. Moreover, this tip gap informati
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Morosi, Stefano, and Ilmar F. Santos. "Experimental Investigations of Active Air Bearings." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68766.

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Along with traditional oil lubrication, increasing demand for high-speed applications has renewed attention to gas bearings technology. Traditional aerostatic and aerodynamic gas lubrication has been widely used in a variety of applications, ranging from high-speed spindles to micro and meso-scale turbo-machinery. The present paper deals with experimental rotordynamic testing of a flexible rotor supported by hybrid aerostatic-aerodynamic gas journal bearing equipped with an electronic radial air injection system. From a rotordynamic point of view there are two phenomena that limit the widespre
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Li, Qihan, Litang Yan, and James F. Hamilton. "Investigation of the Steady-State Response of a Dual-Rotor System With Inter-Shaft Squeeze Film Damper." In ASME 1985 Beijing International Gas Turbine Symposium and Exposition. American Society of Mechanical Engineers, 1985. http://dx.doi.org/10.1115/85-igt-39.

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This paper presents an analysis of the steady-state unbalance response of a dual-rotor gas turbine engine with a flexible intershaft squeeze film damper using a simplified transfer matrix method. The simplified transfer matrix method is convenient for the evaluation of the critical speed and response of the rotor system with various supports, shaft coupling, intershaft bearing, etc. The steady-state unbalance response of the rotor system is calculated for different shaft rotation speeds. The damping effects of an intershaft squeeze film damper with different radial clearances under various lev
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GOROSHKO, Andrii. "Multiphysics Modeling of Direct-Start Induction Motor Considering Rotor Unbalance." In Terotechnology XIII. Materials Research Forum LLC, 2024. http://dx.doi.org/10.21741/9781644903315-31.

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Abstract. The paper proposes a multiphysics model of the dynamics of an induction motor with a squirrel-cage rotor, taking into account the forced vibrations caused by the mass and magnetic eccentricity of the rotor. The model is based on numerical modeling of the motor operation, analytical modeling of the motor oscillations with a rotor containing mass eccentricity and numerical modeling of the motor oscillations with a rotor containing static and dynamic magnetic eccentricity. The model makes it possible to simulate vibrations of rotors and induction motor casings with account of moments of
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Gupta, T. C., K. Gupta, and D. K. Sehgal. "Nonlinear Vibration Analysis of an Unbalanced Flexible Rotor Supported by Ball Bearings With Radial Internal Clearance." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-51204.

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In the present work, the nonlinear dynamic response of an unbalanced horizontal flexible rotor supported by deep groove ball bearing is studied. Nonlinearity effects in rolling element bearings arise from Hertzian contact force deformation relationship and clearance between rolling elements and races. The system is bi-periodically excited due to varying compliance of ball bearing and rotating unbalance. The flexible rotor bearing system is modeled by finite element method, taking into account the gyroscopic moments, rotary inertia, shear deformation, proportional damping, nonlinear stiffness a
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