Gotowe bibliografie tematyczne / Rotor system- Vibrational characteristics

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Gotowa bibliografia na temat „Rotor system- Vibrational characteristics”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Rotor system- Vibrational characteristics"

Choy, F. K., J. Padovan i Y. F. Ruan. "Coupling of Rotor-Gear-Casing Vibrations During Extreme Operating Events". Journal of Pressure Vessel Technology 114, nr 4 (1.11.1992): 464–71. http://dx.doi.org/10.1115/1.2929256.

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During extreme operating environments (i.e., seismic events, base motion-induced vibrations, etc.), the coupled vibrations developed between the rotors, bearings, gears and enclosing structure of gear-driven rotating equipment can be quite substantial. Generally, such large vibrational amplitudes may lead to failures in both the rotor-gearing system and/or the casing structure. This paper simulates the dynamic behavior of rotor-bearing-gear system resulting from motion of the enclosed structure. The modal synthesis approach is used in this study to synthesize the dynamics of the rotor systems with the vibrations of their casing structure in modal coordinates. Modal characteristics of the rotor-bearing-gear systems are evaluated using the matrix transfer technique, while the modal parameters for the casing structure are developed through a finite element model using NASTRAN. The modal accelerations calculated are integrated through a numerical algorithm to generate modal transient vibration analysis. Vibration results are examined in both time and frequency domains to develop representations for the coupled dynamics generated during extreme operating conditions. Typical three-rotor bull gear-driven power plant equipment (compressors, pumps, etc.) is used as an example to demonstrate the procedure developed.

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Wang, Shuang, Xin Ma, Yongcun Guo, Shousuo Sun i Zeyong Hu. "Vibrational coupling mechanism and experimental study of rotor system with double-disk magnetic coupler". Advances in Mechanical Engineering 15, nr 3 (marzec 2023): 168781322311629. http://dx.doi.org/10.1177/16878132231162954.

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At present, the vibrational coupling mechanism of the rotor system with a double-disk magnetic coupler has not been sufficiently studied. Based on the mechanical impedance theory, the patterns of structural mass and stiffness distribution were quantitatively described, to establish the model for the vibrational coupling mechanism. Methods were proposed to determine the vibrational coupling point and to simulate the transient response to the interacting excitations, so as to analyze the potential vibrational coupling point and the dynamic response characteristics. Then, the Campbell diagram of the shared support-dual rotor system was combined with the mechanical impedance characteristics of the shared support. As a result, it was found that although the base vibration of the shared support was significantly amplified, the single-axis trajectory showed that both the output and input rotors were synchronized with the forward vortex motion, with almost no coupling between them. A double-disk magnetic coupler test bench with a rated power of 55 kW was designed to verify the experiments. The results showed that the vibration displacement occurred in a periodic variation pattern. Moreover, the maximum errors between the theoretical, simulated, and experimental values of the vibration displacement at different input speeds were less than 5%. The experiments verified the validity of the model for the vibrational coupling mechanism and the simulation of the transient response to the interacting excitation. The results of the study could be used as a basis for calculating the vibration of the rotor system with a double-disk magnetic coupler.

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Kurakin, Anton. "EFFECT OF FRICTION ON VIBRATIONAL CHARACTERISTICS OF ROTOR SYSTEM DURING ROTOR-STATOR INTERACTION". Perm National Research Polytechnic University Aerospace Engineering Bulletin, nr 61 (2020): 22–31. http://dx.doi.org/10.15593/2224-9982/2020.61.03.

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Systems operation which include rotating elements in certain cases is associated with occurrence of contact between the rotating parts (rotor) and the stationary parts (stator). There were cases then rotor-stator interaction led to damage or to complete unit destruction. For this reason, rotor-stator interaction is one of the main problem of rotor systems exploitation. The main aim of the work is to gather detail data about effect of friction on vibrational characteristics of rotor system during rotor-stator interaction. In this article the experimental investigation method and experimental investigation of dynamic behavior of rotor during rotor-stator interaction is presented. The analysis of experimental data obtained during interaction between steel rotor and stator made of aluminum, bronze and PTFE is presented. All results with rotor-stator contact and without were compared by using Campbell diagrams, orbits and frequency responses. Analysis of experimental data shows that friction has strong effect on vibrational characteristics of rotor system during rotor-stator interaction. According to friction ratio three kinds of vibrational characteristics of rotor system are distinguished: forward slipping if friction coefficient is small, backward rolling if friction coefficient is big, vibratory impact motion if friction coefficient has intermediate value. Created experimental method and gathered data about rotor dynamics during rotor-stator contact can be used for verification and tuning of mathematical models.

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Muszynska, Agnes. "Vibrational Diagnostics of Rotating Machinery Malfunctions". International Journal of Rotating Machinery 1, nr 3-4 (1995): 237–66. http://dx.doi.org/10.1155/s1023621x95000108.

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This paper outlines rotating machinery malfunction diagnostics using vibration data in correlation with operational process data. The advantages of vibration monitoring systems as a part of preventive/predictive maintenance programs are emphasized. After presenting basic principles of machinery diagnostics, several specific malfunction symptoms supported by simple mathematical models are given. These malfunctions include unbalance, excessive radial load, rotor-to-stator rubbing, fluid-induced vibrations, loose stationary and rotating parts, coupled torsional/lateral vibration excitation, and rotor cracking. The experimental results and actual field data illustrate the rotor vibration responses for individual malfunctions. Application of synchronous and nonsynchronous perturbation testing used for identification of basic dynamic characteristics of rotors is presented. Future advancements in vibration monitoring and diagnostics of rotating machinery health are discussed. In the Appendix, basic instrumentation for machine monitoring is outlined.

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Sinou, Jean-Jacques. "Damage Detection in a Rotor Dynamic System by Monitoring Nonlinear Vibrations and Antiresonances of Higher Orders". Applied Sciences 12, nr 23 (22.11.2022): 11904. http://dx.doi.org/10.3390/app122311904.

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Since rotor systems are very sensitive and vulnerable to transverse crack, early detection of damage is of paramount importance and essential for rotating machinery. Therefore, one of the main issues is to identify robust characteristics of the rotor vibration response that can be directly attributed to the presence of a transverse crack in a rotating shaft, preferably when the crack is small enough, in order to avoid catastrophic failures of rotating machines. This study investigates the potential links between the nonlinear vibrations and the locations of higher-order antiresonances and structural modifications due to the presence of a breathing crack in rotor systems. Using the proposed numerical results on the evolution of the nonlinear responses of a cracked rotor system, it was observed that a robust diagnostic of the presence of slight damage can be conducted by tracking nonlinear vibrational measurements, with particular attention to the antiresonance behavior of higher orders. These observations can easily serve as target observations for the monitoring system and for identifying the positions of damage at an early stage.

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Ma, Yingqun, Qingjun Zhao, Kai Zhang, Meng Xu i Wei Zhao. "Effects of mount positions on vibrational energy flow transmission characteristics in aero-engine casing structures". Journal of Low Frequency Noise, Vibration and Active Control 39, nr 2 (17.05.2019): 313–26. http://dx.doi.org/10.1177/1461348419845506.

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The main goal of the study is to apply the structural intensity method to analyze the effects of positions of the main-mount and the sub-mount on the vibrational energy flow transmission characteristics in aero-engine casing structures, so as to attenuate the vibration of the casing and the whole aero-engine. Structural intensity method, indicating magnitude and direction of the vibrational energy flow, is a powerful tool to study vibration problems from the perspective of energy. In this paper, a casing-support-rotor coupling model subjected to the rotor unbalanced forces is established by the finite element method. Formulations of the structural intensity of a shell element and the structural intensity streamline are given. A simulation system consisting of the finite element tool and the in-house program is developed to carry out forced vibration analysis and structural intensity calculation. The structural intensity field of the casing is visualized in the forms of vector diagram and streamline representation. The vibrational energy flow behaviors of the casing at the rotor design rotating speed are analyzed, and the vibrational energy flow transmission characteristics of the casing with different axial positions of the main-mount and the sub-mount are investigated. Moreover, some measures to attenuate the vibration of the casing are obtained from the numerical results, and their effectiveness is verified in the frequency domain and the time domain. The results shed new light on the effects of the mount positions on the vibration energy transmission behaviors of the casing structure. The structural intensity method is a more advanced tool for solving vibration problems in engineering. Furthermore, it may provide some guidance for the vibration attenuation of the casing and the whole aero-engine.

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Baher, Karrar, Qasim A. Atiyah i Imad A. Abdulsahib. "Vibration Characteristics of the Bearing Rotor Shaft". Al-Nahrain Journal for Engineering Sciences 25, nr 1 (3.04.2022): 49–54. http://dx.doi.org/10.29194/njes.25010049.

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In this work, the vibrations in the rotor-bearing system are studied experimentally and theoretically using ANSYS Workbench 2020 R1 software to compute the natural frequencies and mode shapes. In the experimental part, the LABVIEW software was used to examine the signal of the frequency domain values obtained from the accelerometer sensors, based on Fast Fourier Transform (FFT) technology and dynamic response spectrum. in the theoretical part, the natural frequencies are determined based on the finite element method for analyzing the system and knowing its behavior and vibration response level. The results showed that the level of vibration becomes higher at high rotational speeds, and it becomes large when the distances between the bearings are large, according to the bearing position and type used in the system. in this work can be concluded, the system is usually affected by the dynamic response around it and is difficult to separate from it, and the vibrations in the system can be controlled by adding an external damping source, which gives the system more stable. A system operating at high speeds can give a large vibration and an unbalanced response.

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Golubkov, V. A., A. U. Gulevitskiy, A. A. Ovodenko, V. F. Shishlakov i A. S. Smirnova. "Structural analysis of vibrational characteristics of rotor systems". Journal of Physics: Conference Series 1515 (kwiecień 2020): 022088. http://dx.doi.org/10.1088/1742-6596/1515/2/022088.

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Keogh, P. S., M. O. T. Cole i C. R. Burrows. "Multi-State Transient Rotor Vibration Control Using Sampled Harmonics". Journal of Vibration and Acoustics 124, nr 2 (26.03.2002): 186–97. http://dx.doi.org/10.1115/1.1448321.

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A technique is introduced to achieve transient vibration attenuation in a multi-input, multi-output flexible rotor/magnetic bearing system. The strategy employs feedback control of measured harmonic components of rotor vibration. Whereas previous harmonic controllers have been based only on steady state vibration characteristics, the new controller also incorporates the transient dynamics. The controller may still be designed from measured data and is determined from target transient vibrational responses arising from step changes in particular disturbances. Account is taken of delays arising from evaluation of harmonic components. Furthermore, stability boundaries for the controller are shown to have significant tolerance to measurement error. The controller is validated experimentally in a flexible rotor/magnetic bearing system and mass loss tests are used to demonstrate rapid decrease in vibration levels with near elimination of transient overshoot.

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Bartlett, H., i R. Whalley. "Distributed rotor dynamics". Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 212, nr 4 (1.06.1998): 249–65. http://dx.doi.org/10.1243/0959651981539442.

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The modelling, simulation and analysis of powered rotors with ‘long’ thin shells is investigated. General results enabling the prediction of the torsional vibrational signature of high-speed assemblies under acceleration or braking conditions are outlined. It is demonstrated that simulated response characteristics can be easily obtained and the effect of varying the rotor geometry can be routinely accommodated. Finally, a rotor for a high-speed paper manufacturing unit is investigated and the torsional behaviour of the assembly is computed. The volatile transient conditions presented are commented upon.

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Rozprawy doktorskie na temat "Rotor system- Vibrational characteristics"

Mat, Isa Ahmad A. "An investigation of the dynamic characteristics of a bolted-rotor system". Thesis, Aston University, 2001. http://publications.aston.ac.uk/11837/.

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A Jeffcott rotor consists of a disc at the centre of an axle supported at its end by bearings. A bolted Jeffcott rotor is formed by two discs, each with a shaft on one side. The discs are held together by spring loaded bolts near the outer edge. When the rotor turns there is tendency for the discs to separate on one side. This effect is more marked if the rotor is unbalanced, especially at resonance speeds. The equations of motion of the system have been developed with four degrees of freedom to include the rotor and bearing movements in the respective axes. These equations which include non-linear terms caused by the rotor opening, are subjected to external force such from rotor imbalance. A simulation model based on these equations was created using SIMULINK. An experimental test rig was used to characterise the dynamic features. Rotor discs open at a lateral displacement of the rotor of 0.8 mm. This is the threshold value used to show the change of stiffness from high stiffness to low stiffness. The experimental results, which measure the vibration amplitude of the rotor, show the dynamic behaviour of the bolted rotor due to imbalance. Close agreement of the experimental and theoretical results from time histories, waterfall plots, pseudo-phase plots and rotor orbit plot, indicated the validity of the model and existence of the non-linear jump phenomenon.

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Біденко, І. Г. "Імовірнісний підхід до визначення основних характеристик системи "ротор-шпаринні ущільнення" відцентрового насоса. Вплив імовірнісного характеру параметрів системи "ротор-шпаринні ущільнення" на вібраційні характеристики відцентрового насоса". Master's thesis, Сумський державний університет, 2018. http://essuir.sumdu.edu.ua/handle/123456789/71068.

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Робота присвячена дослідженню силових гідродинамічних факторів, що виникають під час течії рідини в циліндричних дроселюючих каналах ущільнень відцентрових машин. Ротор і ущільнення розглядаються при цьому як замкннена гідромеханічна система, у якій роль зв’язуючої ланки виконує перекачуване середовище, його інерційні і гідродинамічні характеристики. Вплив середовища особливо істотний при наявності великих градієнтів швидкостей і тисків. Такі умови саме і характерні для малих зазорів шпаринних ущільнень, на яких дроселюються великі перепади тиску, а одна зі стінок належить ротору, що обертається і вібрує. Таким чином, ротор і ущільнення являють собою складну гідромеханічну систему, характеристики якої мають визначальний вплив на надійність та герметичність відцентрових машин. Ускладнює ситуацію той факт, що зазвичай на практиці через встановлені допуски на виготовлення геометричні параметри ущільнень мають випадковий характер, крім того, вони можуть змінюватися в процесі експлуатації через знос поверхонь, і таким чином, динамічні навантаження, що діють на ротор, також будуть мати випадковий характер. Тому в роботі проведено ймовірнісний розрахунок динамічних характеристик ротора, в якому відповідні параметри описуються випадковими величинами або функціями.
Вероятностный подход к определению основных характеристик системы "ротор - щелевые уплотнения" центробежного насоса. Влияние вероятностного характера параметров системы «ротор - щелевые уплотнения» на вибрационные характеристики центробежного насоса.
Probabilistic approach to determination of basic characteristics of the system “rotor – annual seals” of the centrifugal pump. Influence of the probabilistic nature of the system "rotor - annual seals" parameters on the vibration characteristics of centrifugal pump.

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Mokhtar, Md Asjad. "Rotordynamic studies on the rotor-stator contact interaction". Thesis, 2018. http://eprint.iitd.ac.in:80//handle/2074/7957.

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Huang, Yu-Meng, i 黃裕盟. "Vibration Characteristics Analysis and Modal Testing of a Turbo Molecular Pump Rotor-Bearing System". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/50303943730299618843.

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碩士
國立清華大學
動力機械工程學系
98
This study is focused on the dynamic characteristics of a vertical turbo molecular pump rotor-bearing system. The research methods can be divided into two parts, which are numerical analysis and experimental measurements. In numerical analysis, we use the finite element analysis software ANSYS and DyRoBeS to construct a two-dimensional and three-dimensional model of the rotor-bearing system. In the analysis process, by constantly changing the pump system assembly methods we can correct and verify the rotor-bearing system finite element model under different boundary conditions. Next, we calculate the Campbell diagram to understand the dynamic characteristics of the rotor-bearing system, and to compare with the experimental results to verify the model. Finally, we found the relationship between the rotor critical speed and the bearing stiffness in order to provide the design of the molecular pump rotor and the bearing system. Experimental measurements were divided into two parts: static percussion tests and dynamic measurements. Static test can provide the natural frequencies of the rotor-bearing system. Waterfall diagram of the dynamic test can measure the pump system’s critical speed from zero speed up to the working speed crossing, and to insure that the pump working speed is far from the critical speed of 10% in the safe range. In summary, the results of the experimental measurements and numerical analysis can be the basis for the design of the turbo molecular vacuum pump rotor-bearing system analysis techniques in order to identify and prevent pump vibrations.

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Chi, Hsing-Tsan, i 吉星燦. "Prediction of the torsional vibration characteristics ofa damped rotor-shaft system from those of its scale model". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/31402777399044292085.

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碩士
國立高雄海洋科技大學
輪機工程研究所
99
This paper presents the scaling laws that provide the geometry and dynamic similitude conditions between the damped rotor-shaft system and its scale model, so that the torsional vibration characteristics of the full-size rotor-shaft system can be predicted from those of its scale model. The last scaling laws are determined from the equations of motion of the full-size rotor-shaft system and its scale model. Then, the scaling factors, that establish the relationship between the last two systems, involved in the preceding scaling laws (i.e., explicit scaling factors) are determined according to the fundamental physical properties of each scalable parameter of the system, while those not involved in the scaling laws (i.e., the implicit scaling factors) are determined based on the theory of dimensional analysis. Both the free and forced torsional vibration characteristics of the full-size rotor-shaft system and those of its scale model are used to validate the presented scaling laws and scaling factors.

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Chen, Hui-Shan, i 陳慧珊. "Prediction of the lateral vibration characteristics of a full-size rotor-bearing system from those of its scale model". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/04093532359052749919.

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碩士
國立高雄海洋科技大學
輪機工程研究所
96
The object of this paper is to study how to predict the lateral vibration characteristics of the full-size rotor-bearing system by using the scale rotor-bearing model and the associated scaling laws, such that one may significantly reduce the time and money required by the experiments. To this end, the scaling laws for all the relevant parameters regarding the full-size rotor-bearing system and its scale model (such as, sizes of the constituent members, spring constants and damping coefficients of the supports, natural frequencies (of free vibration) and forced-vibration displacements, etc.) are derived first from the equations of motion of the last two systems. Next, the scaling factors for all relevant parameters of the above-mentioned two systems are determined with the theory of dimensional analysis. Now, based on all of the above-mentioned relevant parameters of the full-size rotor-bearing system, one may determine the corresponding parameters of the scale rotor-bearing model by using the associated scaling factors and predict the vibration characteristics of the full-size rotor-bearing system by using the corresponding ones of the scale rotor-bearing model. Finally, the influence of constituent-member sizes on the similarity of natural frequencies (of free vibrations) and the influence of spring constants, damping coefficients and external loads on the similarity of dynamic responses (of forced vibrations) are investigated. Because the literature concerning the use of scaling laws and scale rotor-bearing model for predicting free and forced vibration characteristics of full-size rotor-bearing system is rare, this paper provides a complete and systematic theory and technique in this aspect. Keywords: full-size rotor-bearing system, scale rotor-bearing model, scaling laws, scaling factors, lateral vibration characteristics

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傅英嘉. "Blade Design and Vibration Characteristic Testing of a Turbo Molecular Pump(TMP) Rotor-Bearing System". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/sue67v.

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Kushwaha, Vishwajeet. "Analysis of torsional vibration characteristics for multi-rotor and gear-branched systems using finite element method". Thesis, 2012. http://ethesis.nitrkl.ac.in/3454/1/ethesis_vishwajeet(108me038).pdf.

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Torsional vibrations occur due torelative oscillatory motions superposed on the mean rotation. Rotating systems at running speed near the natural frequencies are prone to excessive angular deflections and hence large stresses which can cause rotating components failure or premature fatigue failures. The objective of the present work is to study the torsional vibration characteristics of multi-rotor and gear-branched systems suing finite element method. Finite element method (FEM) is a numerical technique based on principle of discretization to find approximate solutions to engineering problems. The information about the natural frequencies for rotating systems can help to avoid system failure by giving the safe operating speed range. In the present work, finite element method has been used to find these natural frequencies for different possible cases of multi-rotor and gear-branched systems. The various mode shapes for several cases are also shown to illustrate the state of the system at natural frequencies. The results obtained have been compared with Holzer’s method and transfer matrix method to establish the effectiveness of finite element method for such systems.

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Chun-LinChen i 陳春霖. "Dynamic Characteristics Analysis on Rotor System with Soft Supports". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/38104538988149551398.

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Chang, Jer-Rong, i 張哲榮. "A Study on Dynamic Characteristics of Geared Rotor-Bearing System". Thesis, 1997. http://ndltd.ncl.edu.tw/handle/83738202872182721874.

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博士
國立成功大學
航空太空工程學系
85
This thesis is concerned with the dynamic analysis of a geared rotor-bearing system. A finite element model of the geared rotor-bearing system is developed by taking account of the lateral-torsional coupling effect to obtain the natural frequencies, mode shapes, and the steady-state responses. From the response time histories, the FFT spectra can be obtained to investigate the effects of dynamic coupling terms under different grades of balance quality and spin speeds. In addition, the lateral response due to short circuit torque is examined to be substantial for the turbo-generator set. The nonlinear dynamic behavior of a geared system supported bysqueeze-film dampers is also investigated. The FFT spectra, Poincare maps and bifurcation maps are made to classify the responses whichinclude sub-harmonic, superharmonic, quasi- periodic, and chaotic responses. The hybrid technique of the Harmonic Balance Method and Time Collocation is employed to obtain the stability of the first variation equations with periodic coefficients, which is generatedby the perturbation technique.

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Książki na temat "Rotor system- Vibrational characteristics"

T, Flowers George, Trent Victor S i United States. National Aeronautics and Space Administration., red. Dynamic modelling and response characteristics of a magnetic bearing rotor system including auxiliary bearings. [Washington, DC: National Aeronautics and Space Administration, 1993.

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Vaez-Zadeh, Sadegh. Introduction. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198742968.003.0001.

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An overview of permanent magnet synchronous (PMS) motors and the related control system are presented in this chapter as introductory materials for the rest of the book. The interconnections of the control system to the power electronic inverter and the motor are emphasized. In addition, the major parts of the system are overviewed. Pulse width-modulated voltage source inverter, as the most commonly used power converter in PMS motor drives, is briefly discussed. PMS motors configurations and operating principles are also presented after considering characteristics of permanent magnet materials. Major PMS motor control methods including vector control, direct torque control, predictive control, deadbeat control, and combined vector and direct torque control are briefly reviewed. Finally, several rotor position and speed estimation schemes, and offline and online parameter estimation methods are overviewed.

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Części książek na temat "Rotor system- Vibrational characteristics"

Matsushita, Osami, Masato Tanaka, Hiroshi Kanki, Masao Kobayashi i Patrick Keogh. "Rotor System Evaluation Using Open-Loop Characteristics". W Vibrations of Rotating Machinery, 213–39. Tokyo: Springer Japan, 2017. http://dx.doi.org/10.1007/978-4-431-55456-1_8.

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Han, Dongjiang, Long Hao i Jinfu Yang. "Experimental Investigations on Vibration Characteristics for Bearing-Rotor System of Micro Gas Turbine". W Mechanisms and Machine Science, 343–56. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99272-3_24.

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Desavale, R. G., Jitendra Kumar Katiyar i T. Jagadeesha. "Vibrations Characteristics Analysis of Rotor-Bearings System Due to Surface Defects Based in CNC Machines". W Recent Advances in Manufacturing, Automation, Design and Energy Technologies, 705–10. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4222-7_78.

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El-Mongy, Heba H., Younes K. Younes i Mohamed S. El-Morsy. "Vibrational Characteristics of a Cracked Rotor Subjected to Periodic Auxiliary Axial Excitation". W Mechanisms and Machine Science, 777–87. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09918-7_69.

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He, Wenbo, Zhanghao Shi i Yu Li. "Influence of Eccentric Angle on Dynamic Characteristics of Rotor System". W Lecture Notes in Electrical Engineering, 449–62. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-5912-6_33.

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Zhang, Jianyong, Mingang Hua i Hongwei Wang. "Numerical Characteristics of Rotor Angle in Power System with Random Excitations". W Proceedings of The Eighth International Conference on Bio-Inspired Computing: Theories and Applications (BIC-TA), 2013, 477–84. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-37502-6_57.

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Ma, Yanhong, Wang Cun, Dayi Zhang i Jie Hong. "Experimental Study on the Dynamic Characteristics of Spline Joint in Rotor System". W Proceedings of the 9th IFToMM International Conference on Rotor Dynamics, 1561–70. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06590-8_128.

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Hong, Jie, Konstantin Shaposhnikov, Dayi Zhang i Yanhong Ma. "Theoretical Modeling for a Rotor-Bearing-Foundation System and Its Dynamic Characteristics Analysis". W Proceedings of the 9th IFToMM International Conference on Rotor Dynamics, 2199–214. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06590-8_181.

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Bin, Guangfu, Longkai Wang, Kun Feng i Xuejun Li. "The Identification Method for Dynamic Characteristics Coefficients of Rotor Sliding Bearing Based on System Lag Angle". W Proceedings of the 9th IFToMM International Conference on Rotor Dynamics, 867–82. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06590-8_71.

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Iskakov, Zharilkassin, Nutpulla Jamalov, Azizbek Abduraimov i Akmaral Kalybaeva. "Resonant Oscillations of a Nonideal Gyroscopic Rotor System with Nonlinear Restoring and Damping Characteristics". W New Advances in Mechanisms, Transmissions and Applications, 329–38. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-29815-8_32.

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Streszczenia konferencji na temat "Rotor system- Vibrational characteristics"

Sekhar, A. S., i N. Ravi Kumar. "Vibrational Characteristics of Composite Shafts". W ASME 1999 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/detc99/vib-8277.

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Abstract The present study aims in performing eigenvalue analysis and unbalance response for a rotor system having a composite shaft, modelled based on first order shear deformation theory using finite element method with shell elements. Different materials such as boron epoxy, carbon epoxy and graphite epoxy have been tried for various stacking sequences. From the study it is clear that the stacking sequence and material have great influence on the vibrational characteristics of composite shafts.

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Hong, Jie, XiRu Xu, LiMing Jiang i YanHong Ma. "Vibration Characteristics of Rotor System Considering Gear Meshing". W ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91445.

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Abstract Spiral bevel gears are essential units in the accessories system of the aero-engine. The rotor transmits torque to the accessories system through the spiral bevel gears, which also change the direction of rotation. With the wide application of elastic support and the reduction in the number of bearing frames, the fulcrum stiffness and the rotor shaft stiffness is on the same order of magnitude of the gear meshing stiffness. For these multi-axis gear transmission systems, the effects of time-varying relative displacement between the gear meshing points and its additional constraint on the dynamic characteristics of the rotor ought be considered. In this paper, a coupled mechanical model of the bevel gear-coupled two-shaft rotor system is established. Besides, the coupled vibration mode of the gear-rotor system is studied. Finally, the influence of nonlinearity relative displacement and its additional constraint on the vibration characteristics of the rotor system are analyzed. The results show that the driven gear will produce elastic additional constraint on the rotor under the specific vibration mode. When the gear meshing stiffness is on the same magnitude as the support stiffness of the rotor, and the relative vibration displacement between the driving and driven gears is large enough, it is necessary to consider the influence of additional constraints on the rotor dynamics. The analysis in this paper provide a reference for dynamic optimization designs, fault monitoring and diagnosis of gear-rotor systems.

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Ren, Jie, Jianlin Zhong, Wenjia Xia, Ya Li i Jiuhe Wang. "Experimental Study on Vibration Characteristics of Cracked Rotor System". W Proceedings of the 2018 7th International Conference on Sustainable Energy and Environment Engineering (ICSEEE 2018). Paris, France: Atlantis Press, 2019. http://dx.doi.org/10.2991/icseee-18.2019.22.

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Han, D. C., S. H. Choi, K. B. Park i S. C. Jung. "Vibration Characteristics of a Rotor-Flexible Disk System: In Case of HDD Spindle-Motor System". W ASME 1999 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/detc99/vib-8279.

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Abstract In this paper we investigate the vibration characteristics of a rotor system with flexible disks. The coupled vibration mode between rotating shaft and the flexible disk are analyzed for lateral and axial vibrations respectively. Gyro and sheer effects are considered for the modeling of lateral vibrations. An assumed mode method was used for the disk modeling considering gyro effects. For a numerical example hard disk drive is considered. The natural frequencies of the motor-spindle system with flexible disk of hard disk drive was calculated and compared to the experimental data.

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Guo, Jiashun, i Sanmin Wang. "Vibration characteristics analysis of a Tilt-Rotor transmission-wing system". W 2010 International Conference on Information and Automation (ICIA 2010). IEEE, 2010. http://dx.doi.org/10.1109/icinfa.2010.5512062.

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Liu, Jun, Zhu Han, Chang Wang i Weimin Ge. "Study on Vibration Characteristics of an Asymmetric Dual-rotor System". W 2019 IEEE International Conference on Mechatronics and Automation (ICMA). IEEE, 2019. http://dx.doi.org/10.1109/icma.2019.8816293.

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Hong, Jie, Qiyao Dai, Fayong Wu i Yanhong Ma. "Dynamic Characteristics Analysis of Flexible Rotor System With Pedestal Looseness". W ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-60195.

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Abstract Due to the limitation of assembly conditions and working load environment, the design of pedestal looseness is often used in the structural design of aeroengine multi support flexible rotor, which affects the vibration response and stability of the rotor system. In this paper, a dynamic model of a flexible rotor system with pedestal looseness is established for a practical aeroengine flexible rotor system. Next, a nonlinear modal analysis process for the multi degree of freedom nonlinear rotor system is proposed. Based on this, the nonlinear modal characteristics of the flexible rotor system with pedestal looseness are analyzed. An interval prediction method of modal damping interval for stability analysis of rotor system is presented, and the influence of key characteristic parameters on modal damping and vibration stability of rotor system is explored. Finally, the vibration characteristics of the rotor system are obtained by numerical integration method. The results show that the modal characteristics of the rotor vary with the amplitude of the rotor, and have the feature of interval distribution; vibration stability mainly depends on tangential friction and additional lateral constraint; when the amplitude of the rotor is large, the backward whirling motion may occur and the vibration may be unstable. This paper will provide a theoretical method for dynamic optimization of multi support flexible rotor system, which is helpful to ensure the reliability and safety design of aeroengine.

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Hua, Mingda, Qihan Li i Jinxin Mao. "Dynamic Characteristics Analysis of Complex Rotor–Support–Case System". W ASME 1995 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/95-gt-253.

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The paper presents an analysis of the steady–state and transient dynamic characteristics of complex rotor system based on Transfer Matrix–Modal Synthetic Method. Critical speeds and modes are calculated using substructure transfer matrix method. The transient response is calculated using modal synthetic method respectively. The effects on the transient response of rotor system under the cases of various sudden unbalance levels, radial oil film clearances of damper and different rotor speeds are also investigated. The effectiveness and the capability of squeeze film damper (SFD) for suppressing instability are analyzed and it is found that in order to reduce the vibration of rotor system effectively, the damper parameters must be designed properly. The Transfer Matrix–Modal Synthetic Method discussed in the paper is valuable in theory and practice. The method and results are very useful both in the design and development of complex rotor system.

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Rawal, D., J. Keesee i R. Gordon Kirk. "The Effect of Sensor Location on the Forced Response Characteristics of Rotors With Active Magnetic Bearings". W ASME 1991 Design Technical Conferences. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/detc1991-0248.

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Abstract This paper presents a modification of existing transfer matrix methods for rotor analysis, to predict the response of rotor systems with active magnetic bearings. The position of the magnetic bearing sensors is taken into account and the effect of changing sensor position on the vibrational characteristics of rotor systems is studied. The results for a simple two-mass rotor system are presented as plots of critical frequency vs. sensor position and amplitude at critical frequency vs. sensor position. A typical eight stage centrifugal compressor rotor is analyzed using the modified transfer matrix code and the results are presented as plots of amplitude vs frequency for different cases of sensor location.

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Yang, Shu, Qizheng Zhou i Deshi Wang. "Study on vibration characteristics of rotor-bearing system with gyroscopic effect". W 2011 International Conference on Electrical and Control Engineering (ICECE). IEEE, 2011. http://dx.doi.org/10.1109/iceceng.2011.6056821.

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