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Letteratura scientifica selezionata sul tema "Rotors – Dynamics"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 7 settembre 2023

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Articoli di riviste sul tema "Rotors – Dynamics"

Liu, Bao Guo, Hai Feng Hua, Long Wang Yue e Xiao Ding Xu. "Design of the Post-Processor for Rotors Dynamics Based on the STEP Standard". Advanced Materials Research 706-708 (giugno 2013): 1871–76. http://dx.doi.org/10.4028/www.scientific.net/amr.706-708.1871.

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The STEP standard is an international standard for data expressing and exchanging during the whole life cycle of the product, the neutral file is an universal data exchange form for the data exchanging. In order to develop a STEP post-processer for the rotor dynamics analysis software-Rotors Dynamics, the author elaborates the lexical analysis module and data mapping module, studies the rotor model parameter extraction based on STEP neutral file, and realizes the seamless connectivity between the Rotors Dynamics and the rotor’s CAD model.

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Jalal, Sara, Fernando Ponta, Apurva Baruah e Anurag Rajan. "Dynamic Aeroelastic Response of Stall-Controlled Wind Turbine Rotors in Turbulent Wind Conditions". Applied Sciences 11, n. 15 (27 luglio 2021): 6886. http://dx.doi.org/10.3390/app11156886.

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With the current global trend of the wind turbines to be commissioned, the next generation of state-of-the-art turbines will have a generating capacity of 20 MW with rotor diameters of 250 m or larger. This systematic increase in rotor size is prompted by economies-of-scale factors, thereby resulting in a continuously decreasing cost per kWh generated. However, such large rotors have larger masses associated with them and necessitate studies in order to better understand their dynamics. The present work regarding the aeroelastic behavior of stall-controlled rotors involves the study of the frequency content and time evolution of their oscillatory behavior. A wide range of experiments were conducted to assess the effects of rapid variations on the rotor’s operational conditions. Various gust conditions were tested at different wind speeds, which are represented by pulses of different intensities, occurring suddenly in an otherwise constant wind regime. This allowed us to observe the pure aero-elasto-inertial dynamics of the rotor’s response. A reduced-order characterization of the rotor’s dynamics as an oscillatory system was obtained on the basis of energy-transfer principles. This is of fundamental interest for researchers and engineers working on developing optimized control strategies for wind turbines. It allows for the critical elements of the rotor’s dynamic behavior to be described as a reduced-order model that can be solved in real time, an essential requirement for determining predictive control actions.

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Zaytsev, Nikolay, Denis Zaytsev, Andrey Makarov e Dmitriy Mineev. "NUMERICAL SIMULATION OF THE DYNAMICS OF A FLEXIBLE ROTOR WITH TWO BALL AUTO-BALANCERS". Perm National Research Polytechnic University Aerospace Engineering Bulletin, n. 62 (2020): 31–44. http://dx.doi.org/10.15593/2224-9982/2020.62.04.

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Ball auto-balancing devices can to compensate changes of unbalance "on the move" only for rotors operating at supercritical speeds. For automatic balancing of such rotors, classified as flexible rotors, several auto-balancers located in different cross sections of the shaft are necessary. This makes it necessary to account bending fluctuations on studies of dynamics of the rotor with auto-balancers, that is especially important in the design of the real rotors. In view of the complexity of experimental studies of such rotors in the article the method of direct numerical simulation of the dynamics of the flexible rotor system – supports – auto-balances is considered. The methodological basis of this method is the use of a discrete multi-mass rotor model, which is equivalent in dynamic characteristics to a real rotor, and also the equations of dynamics of the system discrete rotor – supports – auto-balancers, obtained in the direct form of recording. For definition of discrete masses and a matrix of coefficients of influence of stiffness of rotor cross-sections it is supposed to use calculations for finite-element model of a real rotor by existing software complexes of the engineering analysis. The mathematical model of the system dynamics obtained by the Lagrange method takes into account the non-stationarity of the rotor rotation speed, the influence of gravity and the rolling friction of the balls in the auto-balancer cages. Verification of the mathematical model was performed by reproducing the published data using a computational model for a two-support single-disk three-mass rotor with a two-ball auto-balancer. For a four-mass rotor with two two-ball auto-balancers, the results of numerical simulation of dynamics for the modes of acceleration, steady-state rotation and deceleration are presented. It is shown that for the system under consideration, only partial auto-balancing takes place in the steady rotation mode, including after a stepwise increase of the imbalance.

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Pacholczyk, Michał, e Dariusz Karkosiński. "Parametric Study on a Performance of a Small Counter-Rotating Wind Turbine". Energies 13, n. 15 (29 luglio 2020): 3880. http://dx.doi.org/10.3390/en13153880.

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A small Counter-Rotating Wind Turbine (CRWT) has been proposed and its performance has been investigated numerically. Results of a parametric study have been presented in this paper. As parameters, the axial distance between rotors and a tip speed ratio of each rotor have been selected. Performance parameters have been compared with reference to a Single Rotor Wind Turbine (SRWT). Simulations were carried out with Computational Fluids Dynamics (CFD) solver and a Large Eddy Scale approach to model turbulences. An Actuator Line Model has been chosen to represent rotors in the computational domain. Summing up the results of simulation tests, it can be stated that when constructing a CRWT turbine, rotors should be placed at a distance of at least 0.5 D (where D is rotor outer diameter) or more. One can then expect a noticeable power increase compared to a single rotor turbine. Placing the second rotor closer than 0.5 D guarantees a significant increase in power, but in such configurations, dynamic interactions between the rotors are visible, resulting in fluctuations in torque and power. Dynamic interactions between rotor blades above 0.5 D are invisible.

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Fan, Ye Sen, San Min Wang e Zhen Yang. "Dynamic Characteristics of the Coupled System of the High Pressure Rotor and the Radial Driveshaft of a Turbofan Engine". Advanced Materials Research 44-46 (giugno 2008): 127–34. http://dx.doi.org/10.4028/www.scientific.net/amr.44-46.127.

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In a turbofan engine, the high pressure rotor and the radial driveshaft, which transmit the power from the internal gear-box to the external gear-box, are geared by a spiral bevel gear pair. In this paper, a reasonably simplified dynamic model of the coupled rotors system is established, and then, the coupled stiffness matrix and coupled damping matrix of the spiral bevel gear pair are deduced. A shaft element method is proposed to investigate the lateral-torsional coupled vibration equations of the gear-rotor system. Furthermore, the mode shapes and unbalance responses of this two rotors coupled system are simulated. The results indicate that the system derives many new modes and the exciting forces on a rotor of the system would be passed to the other rotor for the gears meshing. When the rotor dynamics of a turbofan engine is being analyzed, the high pressure rotor and the radial drive shaft must be viewed as a whole. The dynamic balance precision of the rotors should be qualified properly, in order to improve the dynamic quality of the turbofan engine.

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Pacholczyk, Michał, Krzysztof Blecharz e Dariusz Karkosiński. "Numerical investigation on the performance of a small counter-rotating wind turbine". E3S Web of Conferences 116 (2019): 00055. http://dx.doi.org/10.1051/e3sconf/201911600055.

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The article presents results of the investigation on the performance of a small counter-rotating wind turbine. Wind turbine has been simulated using Computational Fluid Dynamics methods. Actuator Line Model has been successfully used to represent rotors in computational domain. Parametric study has been carried out, taking into account changes in the tip speed ratio of the rotors while maintaining a constant distance between upwind and downwind rotor. Study results revealed noticeable increase in power coefficient for optimal configuration. Dynamic interaction between rotors has been investigated exposing no significant interference in both torque and power.

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Mimmi, G., e P. Pennacchi. "Analytical model of a particular type of positive displacement blower". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 213, n. 5 (1 maggio 1999): 517–26. http://dx.doi.org/10.1243/0954406991522743.

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Many papers exist in the literature that deal with the twin-screw compressor. This usually has two different rotors, a male and a female, and is commonly used to produce compressed gas for industrial uses. However, a different type of positive displacement rotary compressor with two screws is sometimes used, one of its typical applications being in car engine supercharging. The present paper deals with the latter type, which is defined as a two-screw blower. This blower has two identical helical rotors, each with three lobes. The kinematics and the geometry of the rotors are analysed here, and a complete mathematical model for the rotor is defined. Moreover, different possible shapes of the rotors, depending on the design parameters, are analysed and the limitations in the choice of the design parameters are presented. Finally, an analysis of the theoretical specific slipping of the rotors is presented, showing which zones of the profile are the most stressed. This model will be useful for further studies on rotor pressure loads and blower dynamics.

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Kaleta, Jiří, Josef Michl, Cécile Mézière, Sergey Simonov, Leokadiya Zorina, Pawel Wzietek, Antonio Rodríguez-Fortea, Enric Canadell e Patrick Batail. "Gearing motion in cogwheel pairs of molecular rotors: weak-coupling limit". CrystEngComm 17, n. 41 (2015): 7829–34. http://dx.doi.org/10.1039/c5ce01372k.

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Investigation of the rotor dynamics by X-ray diffraction, spin–lattice relaxation, and DFT modelling of the two rotational barriers in arrays of rod-like molecules with 1,3-bis(ethynyl)bicyclo[1.1.1]pentane rotators conclude to gearing motion between two rotors in a pair.

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Muszynska, Agnes, Charles T. Hatch e Donald E. Bently. "Dynamics of Anisotropically Supported Rotors". International Journal of Rotating Machinery 3, n. 2 (1997): 133–42. http://dx.doi.org/10.1155/s1023621x97000134.

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The paper discusses dynamic effects occurring in machinery rotors supported in bearings and pedestals with laterally different characteristics. In the considered rotor model the anisotropy of radial stiffness and tangential (“cross”) stiffness components are included. Within certain ranges of the rotative speed the support anisotropy leads to the specific, excited-by-unbalance rotor lateral synchronous vibrations in a form of backward (reverse) precession. In addition, one section of the rotor may precess backward, while the other section simultaneously precesses forward. Experimental results illustrate this phenomenon. The analytical model of the system is based on multimode modal approach. It is also shown in this paper that greatly enhanced information for machine malfunction diagnostics can be obtained by simulated rotation of the XY transducer system observing rotor lateral vibration. This simulated rotation can be accomplished by the machine diagnostic data acquistion and processing system. The data processing also includes extraction of forward and backward components of elliptical orbits filtered to one frequency, and the filtered orbit major axis magnitude and its angular orientation.Numerical examples, field data, and experimental results performed on a rotor rig illustrate applications.

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Mimmi, Giovanni, e Paolo Pennacchi. "Compression Load Dynamics in a Special Helical Blower: A Modeling Improvement". Journal of Mechanical Design 123, n. 3 (1 ottobre 1999): 402–7. http://dx.doi.org/10.1115/1.1377016.

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The instantaneous variation of pressure loads acting on the rotors of positive displacement rotary blowers may produce vibrations and noise that in some case produce the failure of the machine and of the piping. In a previous paper the authors determined the pressure loads acting on the rotors, starting from the geometry of the chambers that are formed during the rotor meshing and the thermodynamic transformation of the working fluid. The calculation of the loads has been made in a quasi-static manner. In this paper the model has been improved by taking into account the effects due to a closed volume chamber at the discharge. This assumption better reproduces the real cases and allows the researchers to perform more efficient calculations and more reliable predictions.

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Tesi sul tema "Rotors – Dynamics"

Jarroux, Clément. "Nonlinear transient dynamics of on-board rotors supported by Active Magnetic Bearings". Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEI069/document.

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De manière générale, les turbomachines sont des machines tournantes permettant la conversion des différents types d’énergie. Ces dernières sont composées d’une partie mécanique en rotation, appelée rotor, interagissant avec un fluide. La rotation a donc un rôle clé pour ces machines et la liaison entre les parties fixes et les parties tournantes, appelée palier, est primordiale pour un fonctionnement fiable et optimal. Les turbomachines supportées par des paliers magnétiques actifs (PMAs) sont de plus en plus utilisées par les industriels notamment grâce à l’absence de contact direct entre parties fixes et parties tournantes, permettant un gain d’énergie et une réduction des émissions de CO2. La plupart du temps, ces machines sont « embarquées » et reposent sur des supports mobiles. Les mouvements générés par ces supports doivent être considérés dans la prévision du comportement dynamique des turbomachines afin d’améliorer les designs en conséquence. Cette thèse est une contribution à l’étude des turbomachines supportées par des PMAs sujettes à de fortes sollicitations extérieures. L’approche est numérique et expérimentale. L’utilisation d’un banc d’essais académique composé d’un système rotor-PMA, aux propriétés d’une turbomachine industrielle, a permis de tester les modèles développés pour des cas de sollicitations extérieures de type séisme et choc, générées grâce à l'excitateur 6-axes de l'equipex PHARE. Il est montré que le modèle permet la bonne prévision du comportement réel de la machine. Cet outil pourra donc être utilisé pour des designs de type industriel
Turbomachines are rotating machines enabling the conversion of the different types of energy. The latter are composed of a rotating mechanical part, called rotor, interacting with a fluid. Therefore, rotation play a key role in these machines and the mechanical link between the fixed and the rotating parts, called bearing, is essential for reliable and optimal operations. Turbomachines supported by active magnetic bearings (AMBs) are increasingly used by industrial companies, especially thanks to the absence of direct contact between fixed and rotating parts, enabling energy savings and reduction of CO2 emissions. Most of the time, these machines are "on-board" and are fixed on mobile supports. The motions generated by these supports must be considered in the prediction of the dynamic behaviour of turbomachinery in order to improve the designs accordingly. This PhD is a contribution to the study of turbomachines supported by AMBs subjected to strong external base motions. The approach is numerical and experimental. The use of an academic scale test rig comprising a rotor-AMB system, with the properties of an industrial turbomachine, allowed to test the developed models for cases of external solicitations such as earthquake and shock, thanks to the 6-axis shaker of the equipex PHARE. It is shown that the model provides good predictions of the behaviour of the machine for the tested cases. This tool can therefore be used for industrial designs

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Matos, Catherine Anne Moseley. "Download reduction on a wing-rotor configuation". Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/12058.

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Rigsby, James Michael. "Stability and control issues associated with lightly loaded rotors autorotating in high advance ratio flight". Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26536.

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Thesis (Ph.D)--Aerospace Engineering, Georgia Institute of Technology, 2009.
Committee Chair: J.V.R. Prasad; Committee Member: Daniel P. Schrage; Committee Member: David A. Peters; Committee Member: Dewey H. Hodges; Committee Member: Lakshmi N Sankar. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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El-Shafei, Aly. "Dynamics of rotors incorporating squeeze film dampers". Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/87804.

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He, Chengjian. "Development and application of a generalized dynamic wake theory for lifting rotors". Diss., Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/12389.

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Bitzer, Michael. "Identification of an improved body aerodynamics model for the BO 105". Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/13832.

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Riley, Troy M. "Aeroacoustics and Fluid Dynamics Investigation of Open and Ducted Rotors". University of Cincinnati / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1627667464605408.

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Mendes, Ricardo Ugliara 1987. "Desenvolvimento de um sistema de atuação magnética para excitação de sistemas rotativos". [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/264158.

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Orientadores: Kátia Lucchesi Cavalca Dedini, Luiz Otávio Saraiva Ferreira
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica
Made available in DSpace on 2018-08-17T15:03:09Z (GMT). No. of bitstreams: 1 Mendes_RicardoUgliara_M.pdf: 2835811 bytes, checksum: c8cae753b116c3893246e25fb64fdf4c (MD5) Previous issue date: 2011
Resumo: Máquinas rotativas apresentam um vasto campo de aplicação como aeronaves, fábricas, laboratórios e usinas de energia. Estas aplicações contêm eixos girando a altas velocidades que devem ter alto nível de confiabilidade. Assim, a análise do comportamento dinâmico destas bombas e turbinas é necessária para estabelecer padrões de funcionamento do equipamento. Ultimamente, com projetos feitos com auxílio de computador, modelos de elementos finitos de eixos incluindo mancais, discos, selos e acoplamentos têm sido desenvolvidos. Através destes modelos, o comportamento das máquinas pode ser previsto, permitindo projetos otimizados baseados nos cálculos de velocidades críticas e simulações de instabilidades do filme de óleo. Estas informações fornecem a base para o desenvolvimento de controladores para reduzir vibrações durante a partida de máquinas, assim como aceleração ou desaceleração através das velocidades críticas, ou ainda para controlar instabilidades do filme de óleo. Uma das técnicas aplicadas na identificação de parâmetros de máquinas e estruturas é a análise modal, a qual consiste em aplicar uma força de perturbação no sistema e, então, medir sua resposta. Entretanto, há uma dificuldade que traz limitações à excitação de sistemas com eixos rotativos, quando utilizando martelos de impacto ou shakers, uma vez que, devido ao atrito, forças tangenciais e ruídos indesejados podem ser aplicados ao sistema. Portanto, o estudo de uma técnica de excitação externa sem contato se torna de grande interesse. Neste sentido, o presente trabalho trata do estudo e desenvolvimento de um modelo em elementos finitos de máquinas rotativas integrado ao modelo de um atuador magnético como fonte de excitação externa, focando na resposta do modelo e sua interação com o atuador. Também é apresentada uma comparação entre simulações numéricas e testes práticos obtidos de uma bancada experimental
Abstract: Rotating machines have a wide range of application such as airplanes, factories, laboratories and power plants. These applications contain shafts rotating at high speeds that must have high trust levels. Thus, the dynamic behavior analysis of these pumps and turbines is required to establish operational patterns of the equipment. Lately, with computer aid design, shafts finite element models including bearings, discs, seals and couplings have been developed. Through these models the machines behavior can be predicted, allowing optimized design based on the critical speeds calculus and oil instabilities simulations. These informations provide the basis for controller development in order to reduce vibrations during the machines start-up and acceleration or deceleration through the critical speeds, or even to control oil instabilities. One of the technique es applied in parameters identification of machines and structures is the modalanalysis, which con sists of applying a perturbation force into the system and then to measure its response. However, there is a difficulty that brings limitations to the excitation of systems with rotating shafts when using impact hammers or shakers, due to friction, undesired tangential forces and noise that can be applied to the system. Therefore, the study of a non-contact technique of external excitation becomes of high interest. In this sense, the present work deals with the study and development of a finite element model for rotating machines using a magnetic actuator as source of external excitation, focusing on the model response and its interaction with the actuator. It is also presented a comparison between the numerical simulations and practical tests obtained from a rotor test rig
Mestrado
Mecanica dos Sólidos e Projeto Mecanico
Mestre em Engenharia Mecânica

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Medeiros, Everton Coelho de. "Projeto e avaliação do comportamento dinâmico de um conjunto de mancais hidrodinâmicos aplicados a um rotor Jeffcott /". Guaratinguetá, 2017. http://hdl.handle.net/11449/151475.

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Orientador: Mauro Hugo Mathias
Coorientador: Willy Roger de Paula Mendonça
Banca: José Elias Toamzini
Banca: Everaldo de Barros
Resumo: Os estudos relacionados a máquinas rotativas são muito importantes no apoio e manutenção da operação de máquinas de grande porte, tais como turbo compressores ou turbinas. Modelos analíticos e numéricos têm sido aplicados por anos, entretanto, eles nem sempre apresentam as condições reais dessas máquinas. Por isso, o uso de procedimentos experimentais para a avaliação e validação de resultados de máquinas rotativas é importante para a etapa de projeto mecânico. O uso de modelos em escala, por exemplo, turbinas hidráulicas ou turbinas a vapor, tem sido comum nesta área. Um rotor é dividido em várias partes, sendo uma delas os elementos de suporte, mais especificamente os mancais. Os mancais podem ser divididos em vários tipos, os mais utilizados são os do tipo rolamento e tipo hidrodinâmico. Devido este último ser o mais encontrado em máquinas pesadas, seu estudo é muito importante. Este trabalho objetiva apresentar o projeto de um protótipo de um mancal hidrodinâmico e sua avaliação experimental. O mancal desenvolvido consiste de uma bucha de bronze montada sobre uma casa de mancal de alumínio e sistemas de vedação para o óleo lubrificante. As geometrias das buchas e as propriedades dos fluidos foram analisadas pela medição do comportamento dinâmico de um rotor apoiados por esses mancais. Esta avaliação foi baseada na medição de uma bancada do tipo Jeffcott apoiada em um par de mancais hidrodinâmicos em condições diversas, incluindo combinações entre mancais do tipo rolamento... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Studies related to rotary machines are very important to support and keep the operation of large machines such as turbochargers or turbines. Analytical and numerical models have been applied for years, however, they do not always present the real condition of these machines. Therefore, the use of experimental procedures for the evaluation and validation of rotating machine results is important for mechanical design step. The use of scale models, for example, hydraulic turbines or steam turbines, has been very common in this area. A rotor is divided into several parts, one of which is the support elements, more specifically the bearings. The bearings can be divided into several types, the most common are the ball/roller bearing and the hydrodynamic bearing. Due to the latter be the most applied in heavy machinery, his study is very important. This work aims to show the design of a prototype of a hydrodynamic bearing and its experimental evaluation. The developed bearing consists of a bronze bushing mounted on an aluminum bearing housing and sealing systems for lubricating oil. The bushing geometries and the properties of the fluids are analyzed by measuring the dynamic behavior of a rotor supported by these bearings. This evaluation was based on the measurement of a Jeffcott rotor test bench supported by hydrodynamic bearings under a variety of conditions, including combinations of rolling and hydrodynamic type bearings,variation of the internal geometry of the bronze bushing ... (Complete abstract click electronic access below)
Mestre

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Jayasuriya, Arachige Tilak A. "Dynamics of unbalanced rotors on rigid and flexible bearings". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0016/MQ48062.pdf.

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Più fonti

Libri sul tema "Rotors – Dynamics"

Kiciński, Jan. Rotor dynamics. 2^a ed. Gdańsk: Wydawn. IMP PAN, 2006.

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Krämer, Erwin. Dynamics of Rotors and Foundations. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-662-02798-1.

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Dynamics of rotors and foundations. Berlin: Springer-Verlag., 1993.

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Krämer, Erwin. Dynamics of Rotors and Foundations. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993.

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Rao, J. S. Rotor dynamics. 2^a ed. New York: J. Wiley, 1991.

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Rao, J. S. Rotor dynamics. 2^a ed. New Delhi: Wiley Eastern, 1991.

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I, Friswell M., a cura di. Fundamentals of rotor dynamics. New York: Cambridge University Press, 2010.

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Conference on Mechanical Vibration and Noise (12th 1989 Montreal, Quebec). Rotating machinery dynamics. New York, N.Y. (345 E. 47th St., New York 10017): American Society of Mechanical Engineers, 1989.

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International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (3rd 1990 Honolulu, Hawaii). Rotating machinery--dynamics: Proceedings of the Third International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC-3). Washington: Hemisphere Pub. Corp., 1992.

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Rotordynamics. Boca Raton: Taylor & Francis, 2005.

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Capitoli di libri sul tema "Rotors – Dynamics"

Krämer, Erwin. "Cracked Rotors". In Dynamics of Rotors and Foundations, 329–47. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-662-02798-1_23.

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Krämer, Erwin. "Vertical Rotors". In Dynamics of Rotors and Foundations, 115–28. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-662-02798-1_8.

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Nordmann, Rainer. "Dynamics of Flexible Rotors". In Magnetic Bearings, 251–97. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-00497-1_10.

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Genta, Giancarlo. "Dynamics of controlled rotors". In Mechanical Engineering Series, 581–613. New York, NY: Springer US, 2005. http://dx.doi.org/10.1007/0-387-28687-x_16.

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Krämer, Erwin. "Bending Stresses in Rotors". In Dynamics of Rotors and Foundations, 325–28. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-662-02798-1_22.

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Krämer, Erwin. "Rotors with Oil-film Bearings". In Dynamics of Rotors and Foundations, 97–114. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-662-02798-1_7.

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Krämer, Erwin. "Introduction". In Dynamics of Rotors and Foundations, 3–6. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-662-02798-1_1.

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Krämer, Erwin. "Shaft Seals". In Dynamics of Rotors and Foundations, 143–59. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-662-02798-1_10.

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Krämer, Erwin. "Steam Whirl". In Dynamics of Rotors and Foundations, 161–68. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-662-02798-1_11.

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Krämer, Erwin. "Internal Damping". In Dynamics of Rotors and Foundations, 169–90. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-662-02798-1_12.

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Atti di convegni sul tema "Rotors – Dynamics"

Marin, Manuel A. "Rotor Dynamics of Overhung Rotors: Hysteretic Dynamic Behavior". In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68285.

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Abstract (sommario):

Overhung-configuration rotors are commonly used in the oil, gas and process industries. Examples of this type of equipment include power turbines, Fluid Catalytic Cracking (FCC) expanders, turbochargers and pipeline boosters. Generally, in overhung-configuration rotors, the mass concentration is near the bearing on the overhung end, so the rotor dynamics behavior of these overhung-configuration rotors is different than other equipments that have their mass concentrations between the bearing spans, such as multistage compressors. Among the more important characteristics that directly affect the rotor dynamics of the overhung rotors are gyroscopic effects on the higher modes and the fluid-film journal bearings. Gyroscopic effects are more significant in overhung configurations because of the relatively large overhung mass. These rotors also have a short bearing span and a relatively stiff shaft, so the first two modes are characterized by rigid body motion, as long as the bearing supports are rigid, as in most pipeline boosters. For pipeline boosters it would be typical to describe them as subcritical machines. If the bearing supports are not rigid, as at the disc end of power turbines and FCC expanders, then the first mode can be amplified, and it would not be unusual to describe them as supercritical machines. This paper will assume that the bearing supports are rigid, as in most pipeline boosters. A phenomenon observed in overhung rotors is known as the synchronous thermal instability or “Morton Effect”. The Morton Effect occurs when synchronous vibration produces non-uniform heating of the shaft under the bearing, leading the shaft end to develop a thermal bow. It is typical for this to happen on the overhung end of the rotor, where there is more unbalance to react with any thermal bow. The paper examines the hysteretic dynamic behavior observed in an overhung rotor mounted on tilting pad journal bearings, presenting a series of analysis using state-of-the-art rotor dynamics programs, and comparing analytical results with measurements, handling possible variables associated with synchronous “hysteresis” vibration.

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Friedmann, Peretz, Kuo-An Yuan, Thomas Millott e Comandur Venkatesan. "Correlation studies for hingeless rotors in forward flight". In Dynamics Specialists Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1994. http://dx.doi.org/10.2514/6.1994-1722.

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Beylich, Alfred E. "An interlaced system for rigid rotors". In RAREFIED GAS DYNAMICS: 22nd International Symposium. AIP, 2001. http://dx.doi.org/10.1063/1.1407593.

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Steijl, R., G. Barakos e K. Badcock. "A CFD Framework for Analysis of Helicopter Rotors". In 17th AIAA Computational Fluid Dynamics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.2005-5124.

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Gupta, K., R. Kumar, M. Tiwari e O. Prakash. "Effect of Rotary Inertia and Gyroscopic Moments on Dynamics of Two Spool Aeroengine Rotor". In ASME 1993 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/93-gt-045.

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The main objective of the paper is to study the effect of rotary inertia and gyroscopic moments due to lumped masses on the dynamics of two spool aeroengine rotors. Since the rotary inertia effect is well established, the thrust of the paper is on the effect of gyroscopic moments. Quantitative as well as qualitative aspects are studied. Effect of gyroscopics and rotary inertia on rotor critical speeds and unbalance response are studied for several rotors with particular reference to relative LP and HP rotor speeds. A two spool rig which resembles an actual aeroengine has been designed and built. Experiments have been conducted on two configurations of the rig in order to verify the theoretical results obtained by a formulation developed using the method of extended transfer matrices, for the two spool rotor with two intershaft bearings. A reasonably good correlation between the theoretical and experimental results is observed.

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Iancu, Florin, Janusz Piechna e Norbert Müller. "Numerical Solutions for Ultra-Micro Wave Rotors (UmWR)". In 35th AIAA Fluid Dynamics Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.2005-5034.

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Tatossian, Charles, e Siva Nadarajah. "Optimum Shape Design of Helicopter Rotors via Control Theory". In 18th AIAA Computational Fluid Dynamics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2007. http://dx.doi.org/10.2514/6.2007-3951.

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Daly, John, Elvis Sheik Bajeet, Ajit Thakker e Patrick Frawley. "A 3D Computational Fluid Dynamics Analysis of the Wells Turbine". In ASME 2002 Joint U.S.-European Fluids Engineering Division Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/fedsm2002-31321.

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This paper deals with the application of Computational Fluid Dynamics (CFD) to the performance comparison of some proposed blade designs for the Well’s Turbine. The turbines were modelled at typical Reynolds numbers for full scale rigs and the results were found to correlate well with scale predictions from experimental data. Three different turbine designs were analysed, one a 4-bladed rotor and the other two 8-bladed rotors. The only difference between the two 8-bladed rotors was the addition of forward sweep to one. The addition of forward sweep was shown to have little effect on the overall performance of the 8-bladed rotor. The 4-bladed rotor was shown to have the highest efficiency and pressure drop at low flow rates, however it was also shown to have a much smaller operating range than the 8-bladed rotors.

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Dang, Ying, S. Subramanian e Gopal Gaonkar. "Modeling turbulence seen by multibladed rotors for predicting rotorcraft response with three-dimensional wake". In Dynamics Specialists Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1996. http://dx.doi.org/10.2514/6.1996-1217.

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Shang, Xiaoyang, e Dewey Hodges. "Aeroelastic stability of composite hingeless rotors with advanced configurations". In 37th Structure, Structural Dynamics and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1996. http://dx.doi.org/10.2514/6.1996-1548.

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Rapporti di organizzazioni sul tema "Rotors – Dynamics"

Zheng, Wanzheng, e Jason Merret. Aerodynamic Survey of Novel eVTOL Configuration Using SU2. Illinois Center for Transportation, agosto 2022. http://dx.doi.org/10.36501/0197-9191/22-014.

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This report summarizes computational fluid dynamics (CFD) results of electric vertical takeoff and landing (eVTOL) geometries using the SU2 Reynolds-averaged Navier-Stokes (RANS) solver. Geometries were generated based on the Smart Transportation Infrastructure Initiative (STII) Rappor 15th iteration with various rotor-installment solutions. It was found that although open rotors installed on an underwing pylon were superior to shrouded rotors installed in a canoe, the canoe configuration would provide more potential for improvement, and using a canoe door to cover the first rotor opening would reduce the drag experienced by the canoe case below that upon the rod case. Rotor doors were found to be most efficient in reducing drag of the canoe case: Average drag reduction with covering the first rotor and all rotors was 66 and 165 counts, respectively. Changing rotor distributions along the chordwise direction had minimal impact on drag reduction, and placing rotors along the spanwise direction was not advised due to the increase of the projected frontal area. Increasing canoe chord length did not have significant impact on drag reduction; and if rotor doors were implemented, increasing canoe size had negative impact on drag. Rounding rotor edges did not change the aerodynamic performance of the canoe case but promotes vertical air intake when running lifting fans. Drag received by the canoe parabolically correlated to rotor diameter, with 126 counts of drag if the rotor diameter was 0 and 377 counts if the rotor diameter was 2.95 ft. Fuselage and tail added an average 179 counts of drag, and thus the aforementioned differences were still significant in the scale of aerodynamic properties of the full configuration.

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Engblom, John J., e Ozden O. Ochoa. Nonlinear Dynamic Responses of Composite Rotor Blades. Fort Belvoir, VA: Defense Technical Information Center, agosto 1988. http://dx.doi.org/10.21236/ada200145.

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Vande Vate, John H., John J. Bartholdi e III. Static and Dynamic Balance of Rotor Stacks. Fort Belvoir, VA: Defense Technical Information Center, aprile 1995. http://dx.doi.org/10.21236/ada299409.

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Bartholdi III, John J., e John H. Vande Vate. Static and Dynamic Balance of Rotor Stacks. Fort Belvoir, VA: Defense Technical Information Center, febbraio 1998. http://dx.doi.org/10.21236/ada340085.

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Watson, Kevin, Jason Cormey, Narayanan Komerath e James DiOttavio. Diagnostics of 3D Dynamic Stall on Rotor Blades. Fort Belvoir, VA: Defense Technical Information Center, giugno 2008. http://dx.doi.org/10.21236/ada499703.

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Shabana, Ahmed A. A New Non-Incremental Finite Element Solution Procedure for Rotor Dynamics. Fort Belvoir, VA: Defense Technical Information Center, novembre 2005. http://dx.doi.org/10.21236/ada440805.

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Sokolov, Volodymyr, Oleg Krol, Oksana Stepanova e Petko Tsankov. Dynamic Characteristics of Rotary Motion Electrohydraulic Drive with Volume Regulation. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, maggio 2020. http://dx.doi.org/10.7546/crabs.2020.05.12.

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Srinivasan, Ganapathi R. A Free-Wake Euler and Navier-Stokes CFD Method and its Application to Helicopter Rotors Including Dynamic Stall. Fort Belvoir, VA: Defense Technical Information Center, novembre 1993. http://dx.doi.org/10.21236/ada278000.

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Chaplin, Harvey R. Some Dynamic Properties of a Rigid Two-Bladed Fully Gimballed Rotor with Teetering Feedback. Fort Belvoir, VA: Defense Technical Information Center, luglio 1986. http://dx.doi.org/10.21236/ada194946.

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Gillard, William J. Innovative Control Effectors (Configuration 101) Dynamic Wind Tunnel Test Report. Rotary Balance and Forced Oscillation Tests. Fort Belvoir, VA: Defense Technical Information Center, luglio 1998. http://dx.doi.org/10.21236/ada362903.

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