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Journal articles on the topic 'Rotor-Dynamic Test Rig'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 September 2023

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1

Zou, M., J. Dayan, and I. Green. "Dynamic simulation and monitoring of a non-contacting flexibly mounted rotor mechanical face seal." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 214, no. 9 (2000): 1195–206. http://dx.doi.org/10.1243/0954406001523632.

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Mechanical face seal rotor dynamics is investigated through both simulation and real-time monitoring of a non-contacting flexibly mounted rotor (FMR) mechanical face seal in a seal test rig. Dynamic simulation is performed to investigate the seal rotor angular response to the stator misalignment, the stator angle, the initial rotor misalignment and clearance. Rotor angular response orbit is introduced and is able to characterize the rotor dynamic response. A real-time monitoring system is constructed in the test rig to monitor the instantaneous dynamic behaviour of the seal rotor, including it

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2

Song, Huiying, Shaohui Wang, and Kai Sun. "Rotordynamic Characteristics Analysis for an aero-engine Low Pressure Rotor Rig Test Model." MATEC Web of Conferences 179 (2018): 03012. http://dx.doi.org/10.1051/matecconf/201817903012.

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3D whole engine finite element model of a low pressure rotor rig test model is established in this paper. Rotorynamic characteristics are mainly analysed with three models, which include rotor model with static stiffness, rotor model with dynamic stiffness, and whole engine model. The calculation results were compared and discussed deeply. Rotordynamic characteristics of rotor model with static stiffness are similar with the rotor model with dynamic stiffness, but the latter may have additional resonance peaks caused by dynamic stiffness. Whole engine model, which can capture the modes of casi

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3

Li, Qiang, Shuo Zhang, Yujun Wang, Weiwei Xu, and Zhenbo Wang. "A dynamic response test rig of a full-scale rotor–journal bearing system." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 233, no. 4 (2018): 649–59. http://dx.doi.org/10.1177/1350650118817183.

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A design strategy of a test rig for the dynamic behavior of a rotor supported by two full-scale journal bearings was proposed. A special part, called “intermediate”, was set up to allow the convenient changing of the bearing structure. An electromagnetic exciter was used to obtain the natural frequency, and software running on the Microsoft Visual C++6.0 operating platform was programmed for signal acquisition and analysis. Then, the test rig was constructed. The field dynamic balance and natural frequency testing were carried out. The journal orbits and frequency spectrums were used to measur

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4

Feng, Zhiguo, Qiang Ding, Yinhui Cai, and Weipeng Sun. "Experimental Investigation of the Dynamic Response of a Sliding Bearing System under Different Oil Pressure Levels." Applied Sciences 12, no. 19 (2022): 9759. http://dx.doi.org/10.3390/app12199759.

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A sliding bearing system performs a critical function in a rotating machinery system and provides support for the rotating components. In this paper, a single-rotor experimental rig and a dual-rotor sliding bearing experimental rig were independently established, and the dynamic response of the test systems are investigated. To study the effect of oil pressure levels on the dynamic response of the test systems under the single-rotor system and the dual-rotor system, the vibration response of single-rotor and dual-rotor systems ware analyzed by different oil inlet pressures to study the effect

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5

Lee, An Sung, and Itzhak Green. "Higher Harmonic Oscillations in a Noncontacting FMR Mechanical Face Seal Test Rig." Journal of Vibration and Acoustics 116, no. 2 (1994): 161–67. http://dx.doi.org/10.1115/1.2930407.

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In order to investigate experimentally the dynamic behavior of a noncontacting flexibly mounted rotor (FMR) mechanical face seal a test rig was designed and built. Test results showed that the FMR seal was vulnerable to higher harmonic oscillations with frequencies that are integer multiples of the shaft speed. Because system nonlinearities can cause higher harmonic oscillations, the dynamic moments acting on the rotor are derived to include the effects of imbalance and axial offset of the rotor. The analysis reveals that the nonlinear terms involved are of second order and generally can be ne

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6

Niccolini Marmont Du Haut Champ, Carlo Alberto, Fabrizio Stefani, and Paolo Silvestri. "Development of a new test rig for the analysis of hydrodynamic bearings for rotors of microGT." E3S Web of Conferences 113 (2019): 03002. http://dx.doi.org/10.1051/e3sconf/201911303002.

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The aim of the present work is to design a test rig suited to investigate the dynamic interaction between rotor and hydrodynamic journal bearings in micro gas turbines (microGT), i.e. with reference to small bearings (diameter in the order of ten millimeters). Particularly, the device is capable of measuring the journal location. Therefore, the journal motion due to rotor vibrations can be displayed, in order to assess performance as well as stiffness and damping of the bearings. The new test rig is based on Bently Nevada Rotor Kit (RK), but substantial modifications are carried out. Indeed, t

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7

Pu, Songcheng, Yumin He, Qijiang Yang, et al. "Study on dynamic characteristics of rotor-bearing system under pitching condition." Journal of Physics: Conference Series 2113, no. 1 (2021): 012021. http://dx.doi.org/10.1088/1742-6596/2113/1/012021.

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Abstract In many cases, ships will encounter special conditions, such as bad sea conditions, and the effect of various disturbance factors, such as wind and waves, will cause low-frequency longitudinal and transverse rocking motion of ships. This would affect the rotor-bearing system of the power plant, which is directly attached to the hull of the ship, and would roll along with the hull in the same longitudinal and transverse motion. This will have a significant impact on the stability of the rotor bearing system of the ship power plant and the safety of the ship. In this paper, a rotor-bear

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8

San Andre´s, L., and D. Lubell. "Imbalance Response of a Test Rotor Supported on Squeeze Film Dampers." Journal of Engineering for Gas Turbines and Power 120, no. 2 (1998): 397–404. http://dx.doi.org/10.1115/1.2818136.

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Squeeze film dampers (SFDs) provide vibration attenuation and structural isolation to aircraft gas turbine engines which must be able to tolerate larger imbalances while operating above one or more critical speeds. Rotor-bearing-SFD systems are regarded in theory as highly nonlinear, showing jump phenomena and even chaotic behavior for sufficiently large levels of rotor imbalance. Yet, few experimental results of practical value have verified the analytical predictions. A test rig for measurement of the dynamic forced response of a three-disk rotor (45 kg) supported on two cylindrical SFDs is

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9

Lee, S. U., D. Robb, and C. Besant. "Vibration analysis of a test rig for a radial compressor." Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 215, no. 1 (2001): 21–29. http://dx.doi.org/10.1243/1464419011544312.

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A radial compressor has been designed at Imperial College for cooling a high-speed generator (HSG) coupled directly to a small gas turbine engine to produce 100kW electric power. The compressor has a significant influence on the overall dynamics of the generator. Therefore, it is designed to be lightweight for rotor-dynamic reasons together with reasonable aerodynamic efficiency. An experimental rig for the compressor performance testing was also designed. In order to operate this rig safely, it is very important to be able to predict and analyse its dynamic behaviour. For this purpose, a syst

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10

Wagner, N. G. "Reliable Rotor Dynamic Design of High-Pressure Compressors Based on Test Rig Data1." Journal of Engineering for Gas Turbines and Power 123, no. 4 (2000): 849–56. http://dx.doi.org/10.1115/1.1373396.

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The overall design of high-pressure centrifugal compressors is largely influenced by rotordynamic aspects. Rotor instability may restrict operating speed and/or maximum discharge pressure if the destabilizing effects have not been considered accurately during the design phase. A test rig for high pressures has been designed and operated successfully in order to achieve dynamic labyrinth seal coefficients through simulation of original conditions in every aspect. Details are given of the full-scale test rig, which uses active magnetic bearings as a key feature, as well as results from the compr

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11

Wen, Baogang, Meiling Wang, Xianwen Zhou, Hongjun Ren, and Qingkai Han. "Multi-harmonic motions of bearing cage affected by rotor unbalance." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 232, no. 15 (2017): 2610–25. http://dx.doi.org/10.1177/0954406217722380.

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The motion of bearing cage in the rotor system displays very complicated behavior affected by rotor unbalance. In order to gain an insight into the complex cage motions due to rotor unbalance, a scaled rotor test rig is designed and developed that is made to be dynamically similar to the actual rotor system in aero-engines. Eddy transducers are used to measure the cage motions and monitor the rotor vibrations. Based on the test rig, a dynamic model of its rotor system with four degrees-of-freedom is developed to determine the reaction forces due to rotor unbalance, which are introduced as boun

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12

Hao, Long, Dongjiang Han, Wei Zhao, Qingjun Zhao, and Jinfu Yang. "Numerical and Experimental Investigation on Axial Rub Impact Dynamic Characteristics of Flexible Rotor Supported by Hybrid Gas Bearings." Journal of Low Frequency Noise, Vibration and Active Control 40, no. 3 (2021): 1252–70. http://dx.doi.org/10.1177/1461348420986645.

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Gas bearings are widely used in micro- and small turbomachinery. Because of the pursuit of high efficiency, turbomachinery adopts small clearance of rotor and stator. The gas bearing rotor system easily suffers from rub impact due to the inherently low damping and load capacity of gas film. Axial rub impact may lead to catastrophic failure of gas bearing rotor system. Previous work put emphasis on radial rub, and only a few papers researched on the axial rub impact by simulation method. In this paper, dynamic responses of full annular axial rub are investigated numerically and experimentally.

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13

Mittwollen, N., T. Hegel, and J. Glienicke. "Effect of Hydrodynamic Thrust Bearings on Lateral Shaft Vibrations." Journal of Tribology 113, no. 4 (1991): 811–17. http://dx.doi.org/10.1115/1.2920697.

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A computational method for the prediction of static and dynamic characteristic data of tilting pad and fixed pad thrust bearings for high surface velocities and high thermal loads is developed and verified. Furthermore, a convenient model is presented, which allows the determination of the dynamic coefficients for the gyrating movement of the thrust collar, where it is sufficient using the purely axial dynamic single pad coefficients only. Introducing these coefficients into an accordingly modified rotor dynamics program, the lateral vibrations of a high speed rotor with sliding bearings are c

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14

Stephens, L. S., and D. G. Kim. "Dynamic Modeling and Validation of a Lorentz, Self-Bearing Motor Test Rig." Journal of Engineering for Gas Turbines and Power 125, no. 1 (2002): 156–66. http://dx.doi.org/10.1115/1.1499731.

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A new type of self-bearing motor that uses Lorentz-type forces to generate both bearing force and motoring torque has been developed. The motor stator is of slotless construction with four three-phase windings. The motor rotor is constructed of 16 surface mounted permanent magnets (PM’s). The main advantage of the design is that it eliminates the tradeoff between motoring torque and bearing force with PM thickness as found in previous designs. This paper presents the dynamic model for the self-bearing motor and illustrates how the model is integrated into the overall system model of the motor

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15

Lee, An Sung, and Itzhak Green. "Physical Modeling and Data Analysis of the Dynamic Response of a Flexibly Mounted Rotor Mechanical Seal." Journal of Tribology 117, no. 1 (1995): 130–35. http://dx.doi.org/10.1115/1.2830587.

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The dynamic behavior of mechanical face seals has been an active area of research over the past three decades. Analytical and experimental investigations have exclusively been devoted to the flexibly mounted stator (FMS) seal. Recent theoretical work on the dynamics of the noncontacting flexibly mounted rotor (FMR) seal has proven that it excels in every aspect of dynamic behavior compared to the FMS seal. The advantages of the FMR seal, however, have to be experimentally verified. This work introduces a physical model (i.e., test rig) for an experimental investigation of the dynamic behavior

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16

Ding, Q., and A. Y. T. Leung. "Numerical and Experimental Investigations on Flexible Multi-bearing Rotor Dynamics." Journal of Vibration and Acoustics 127, no. 4 (2004): 408–15. http://dx.doi.org/10.1115/1.1898336.

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An experimental test rig is built to verify the dynamics of a multi-bearing rotor. It consists of two flexibly coupled shafts and is connected to a motor at one end via a flexible coupling. Each of the shafts is supported at the ends by two hydrodynamic bearings and is attached with two disks with equal and unequal masses, respectively. The mathematical model of the test rig is developed and is simulated numerically. The non-stationary dynamic responses of the system during speed-up with a constant angular acceleration are shown, respectively, by the non-stationary bifurcation diagrams, the se

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17

Schultz, K. J., W. Splettstoesser, B. Junker, et al. "A parametric windtunnel test on rotorcraft aerodynamics and aeroacoustics (Helishape) — test procedures and representative results." Aeronautical Journal 101, no. 1004 (1997): 143–54. http://dx.doi.org/10.1017/s0001924000066483.

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Within the framework of a major European co-operative research project on rotorcraft aerodynamics and acoustics (Helishape), a parametric model rotor test was conducted in the open test section of the DNW using DLR's MWM test rig, and a highly instrumented model of a fully articulated ECF rotor equipped with blades of advanced design with two exchangeable blade tips. One set of blade tips (7A) was rectangular, while the other (7AD1) was a swept-back parabolic-anhedral shape. The objectives of this experimental research were to evaluate noise reduction techniques (conceptionally by variation of

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18

Tang, Punan, Alan B. Palazzolo, Albert F. Kascak, and Gerald T. Montague. "Electromechanical Modeling of Hybrid Piezohydraulic Actuator System for Active Vibration Control." Journal of Dynamic Systems, Measurement, and Control 119, no. 1 (1997): 10–18. http://dx.doi.org/10.1115/1.2801199.

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Electromechanical modeling of a hybrid piezohydraulic actuator system for active vibration control was developed. The transfer function of piezoelectric actuator was derived from the electromechanical potential energy law. This transfer function represents the dynamic relationship between input electric voltage and piezoelectric actuator displacement. The hydraulic actuator was characterized by impedance matching in which its transfer functions were experimentally determined. The transfer functions were transformed into a state-space representation, which is easily assembled into an active vib

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19

Tadeo, A. T., K. L. Cavalca, and M. J. Brennan. "Dynamic characterization of a mechanical coupling for a rotating shaft." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 225, no. 3 (2010): 604–16. http://dx.doi.org/10.1243/09544062jmes2214.

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This article concerns the dynamic characterization of a flexible coupling that connects two co-axial shafts. Four different lumped parameter coupling models from the literature are investigated to see which model could best predict the dynamic behaviour of the coupling. The finite-element method was used to model the rotor dynamic system incorporating the coupling. Frequency response functions from this model were compared with measured frequency response functions from the rotor test rig with the shaft and coupling rotating at a specific speed. Parameters from the model were adjusted to minim

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20

de Carvalho Michalski, Miguel Angelo, Moysés Zindeluk, and Renato de Oliveira Rocha. "Influence of Journal Bearing Axial Grooves on the Dynamic Behavior of Horizontal Rotors." Shock and Vibration 13, no. 4-5 (2006): 285–300. http://dx.doi.org/10.1155/2006/785823.

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Journal bearing design and the lubricant characteristics are very influential in a rotating machine behaviour. The bearing geometry can drastically affect the lubricant flow and also the rotor dynamics. Approaching that issue, this paper presents an experimental study of the dynamic behavior of a horizontal rotor suported by journal bearings with semi-circular axial grooves. The journal bearings were manufactured with a varied number of axial grooves and a versatile test rig is used, making possible the analysis of different configurations. The acquired signals are analyzed with classical and

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21

Luo, Yue Gang, Song He Zhang, Bin Wu, and Hui Ma. "Experiment Research of Two-Span Rotor-Bearing System with Rub-Impact and Crack Faults." Advanced Materials Research 706-708 (June 2013): 1335–38. http://dx.doi.org/10.4028/www.scientific.net/amr.706-708.1335.

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The test rig of two-span rotor-bearing system with rub-impact and crack faults was constructed. The vibration of the rotor-bearing system was observed for different conditions, such as single rub-impact fault, double rub-impact faults and coupling faults of rubbing and crack. The 3D-waterfall spectrum of rotor system was used to analyze the dynamic characteristics of the system during faults. The results indicate there appears 6-superharmonic frequency component on double rub-impact faults. The amplitudes of subharmonic frequencies decrease obviously and it of superharmonic frequencies increas

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22

Peng, Wei, Weidong Liu, Xinmin Cheng, and Liping Shi. "Feedforward Chaotic Neural Network Model for Rotor Rub-Impact Fault Recognition Using Acoustic Emission Method." Journal of Electrical and Computer Engineering 2018 (September 20, 2018): 1–9. http://dx.doi.org/10.1155/2018/9718951.

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The rubbing faults caused by dynamic and static components in large rotatory machine are dangerous in manufacture process. This paper applies a feedforward chaotic neural network (FCNN) to recognize acoustic emission (AE) source in rotor rubbing and diagnose the rotor operational condition. This method adds the dynamic chaotic neurons based on logistic mapping into the multilayer perceptron (MLP) model to avoid the network falling into a local minimum, the delayed and feedback structure for maximum efficiency of recognition performance. The AE data was rotor rubbing process sampled from the te

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23

Metkar, Shantanu, Abhishek Ahirrao, and Abhishek Avhad. "Fault Diagnosis of Two Rotor System." International Journal for Research in Applied Science and Engineering Technology 10, no. 11 (2022): 1831–40. http://dx.doi.org/10.22214/ijraset.2022.47699.

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Abstract: Misalignment and unbalance are the most probably common cause of machine vibration. Vibration monitoring is a useful technique for application to rotating machinery and provides valuable information regarding symptoms of machinery failure which may avoid costly breakdown. Understanding and practicing the fundamentals of rotating shaft parameter is the firststep in reducing unwanted vibration. Experimental studies were performed on two rotor dynamic test apparatus to predict the vibration spectrum for different faults. The experimental test rig was designed and tested for misalignment

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Kirk, R. G. "Evaluation of Aerodynamic Instability Mechanisms for Centrifugal Compressors—Part II: Advanced Analysis." Journal of Vibration and Acoustics 110, no. 2 (1988): 207–12. http://dx.doi.org/10.1115/1.3269500.

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The results of advanced analysis for labyrinth seal dynamic characteristics are compared to current methods of calculating aerodynamic excitation and to test rig data published in the literature to date. The results of a shop full load test are presented and compared to predicted stability parameters. Results of the labyrinth analysis of the full-load test compressor are presented. Conclusions and recommendations are given for high pressure compressor rotor dynamics analysis with design guidelines for evaluation of new or proposed compressor designs.

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25

Subramanya, S., and A. Deb. "Design of a High Speed Data Acquisition System for a Transient Rotor-Dynamic Test Rig." Experimental Techniques 40, no. 2 (2016): 521–29. http://dx.doi.org/10.1007/s40799-016-0053-5.

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26

Green, Itzhak, and Cody Casey. "Crack Detection in a Rotor Dynamic System by Vibration Monitoring—Part I: Analysis." Journal of Engineering for Gas Turbines and Power 127, no. 2 (2005): 425–36. http://dx.doi.org/10.1115/1.1789514.

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Many practical rotor dynamic systems contain shaft/rotor elements that are highly susceptible to transverse cross-sectional cracks due to fatigue. The early detection of mechanical malfunction that can be provided by an effective vibration monitoring system is essential. Two theoretical analyses, global and local asymmetry crack models, are utilized to identify characteristics of the system response that may be directly attributed to the presence of a transverse crack in a rotating shaft. A model consisting of an overhung whirling rotor is utilized to match an experimental test rig. A 2X harmo

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27

da Silva, Danilo Alvaro, Gregory Bregion Daniel, and Katia Lucchesi Cavalca. "Development of a Robust Test Rig for Tilting Pad Journal Bearing Validation." Machines 10, no. 3 (2022): 189. http://dx.doi.org/10.3390/machines10030189.

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Several theoretical models for predicting the performance of tilting pad journal bearings (TPJB) have been developed by the scientific community over the years. However, reliable validation of the predictions based on the theoretical models, taking into account the complexity of TPJBs, demands robustness in the design and assembly of an improved test rig. Test bench designs for testing hydrodynamic bearings must carefully consider construction details as much as possible to observe the effect from the journal bearing and, consequently, improve the predictability of its dynamical behavior. In t

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28

Medeiros, Everton C., Airton Nabarrete, Marcela A. Cruchaga, Willy R. P. Mendonca, and Mauro H. Mathias. "Numerical and Experimental Evaluation of Hydrodynamic Bearings Applied to a Jeffcott Test Bench." International Journal of Acoustics and Vibration 26, no. 1 (2021): 64–69. http://dx.doi.org/10.20855/ijav.2020.25.11732.

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Merging analytical and numerical models with experimental results improve the behaviour predictions of mechanical elements applied to rotor machinery, such as the bearings. This work aims to present the design of a hydrodynamic bearing prototype, a comparison and validation between the numerical and experimental results of critical speeds, and the differences of behaviour when the bush geometries and lubrication are changed. The bush geometries and the fluid film properties are analysed by measuring the dynamic behaviour of a rotor supported by these bearings. The experimental evaluation is ba

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29

Su, Rui. "Numerical simulation and experimental study of novel variable speed and constant frequency wind turbine." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 9 (2018): 3111–16. http://dx.doi.org/10.1177/0954406218802926.

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The variable speed and constant frequency wind turbine with differential speed regulation consist of wind rotor, speed regulating motor, differential gear train, and synchronous generator. The differential gear train has characteristics of double input and single output. The wind rotor with variable speed work as one input; the output speed of differential gear train is regulated to be stable by speed regulating motor as another input. The constant frequency current is generated by a synchronous generator. The system is simplified into three shafts rigid model for dynamic analysis, and the num

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Wang, Meiling, Qingkai Han, Baogang Wen, Hao Zhang, and Tianmin Guan. "Modal characteristics and unbalance responses of fan rotor system with flexible support structures in aero-engine." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 231, no. 9 (2016): 1686–705. http://dx.doi.org/10.1177/0954410016658076.

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This paper investigates the vibration patterns, i.e. rigid motions of shaft and elastic deformation of support structures, of fan rotor system in aero-engine, which differs from traditional flexible rotor systems, and together with its shaft transverse motions due to unbalanced mass. The fan rotor system commonly is composed of one rigid shaft and two flexible support structures (such as squirrel cages), which is effective to decrease the critical speeds avoiding serious shaft vibration due to unbalance. Scaled test rig for realistic fan rotor system is set up according to similarity principle

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Wang, Nanfei, Hongzhi Xu, and Dongxiang Jiang. "Dynamic Model and Fault Feature Research of Dual-Rotor System with Bearing Pedestal Looseness." Mathematical Problems in Engineering 2016 (2016): 1–18. http://dx.doi.org/10.1155/2016/3817405.

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The paper presents a finite element model of dual-rotor system with pedestal looseness stemming from loosened bolts. Dynamic model including bearing pedestal looseness is established based on the dual-rotor test rig. Three-degree-of-freedom (DOF) planar rigid motion of loose bearing pedestal is fully considered and collision recovery coefficient is also introduced in the model. Based on the Timoshenko beam elements, using the finite element method, rigid body kinematics, and the Newmark-βalgorithm for numerical simulation, dynamic characteristics of the inner and outer rotors and the bearing p

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Longxi, Zheng, Jia Shengxi, and Huang Jingjing. "Numerical and Experimental Study on the Multiobjective Optimization of a Two-Disk Flexible Rotor System." International Journal of Rotating Machinery 2017 (2017): 1–10. http://dx.doi.org/10.1155/2017/9628181.

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With the ever-increasing requirement for the thrust to weight ratio, the rotational speed of modern aeroengine is increasingly improved; thus most of the aeroengine rotor is flexible. Some dynamic problems, such as excessive vibration, appear due to the increase of the rotation speed of the aeroengine. The aim of this study is to reduce the vibration level of the flexible rotor system through optimum design. A laboratory scale two-disk flexible rotor system representing a typical aeroengine rotor system is designed. A combinational optimization strategy coupling the rotordynamics calculation s

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Zabaryłło, Mateusz, and Tomasz Barszcz. "Proposal of Multidimensional Data Driven Decomposition Method for Fault Identification of Large Turbomachinery." Energies 15, no. 10 (2022): 3651. http://dx.doi.org/10.3390/en15103651.

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High-power turbomachines are equipped with flexible rotors and journal bearings and operate above their first and sometimes even second critical speed. The transient response of such a system is complex but can provide valuable information about the dynamic state and potential malfunctions. However, due to the high complexity of the signal and the nonlinearity of the system response, the analysis of transients is a highly complex process that requires expert knowledge in diagnostics, machine dynamics, and extensive experience. The article proposes the Multidimensional Data Driven Decomposition

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Zhang, Yun, Xuesong Mei, Mingping Shao, and Muxun Xu. "An improved holospectrum-based balancing method for rotor systems with anisotropic stiffness." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 227, no. 2 (2012): 246–60. http://dx.doi.org/10.1177/0954406212447521.

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As a ubiquitous phenomenon in rotor systems, anisotropic stiffness generally causes the response of an unbalanced rotor to vary across radial directions. The standard holospectrum-based balancing method, which adopts the initial phase vector as a balancing object, cannot be used in rotor systems with anisotropic stiffness. To tackle the limitations of the standard holospectrum-based balancing method, an improved holospectrum-based balancing method with increased accuracy and a greater scope of application is presented in this article. First, a dynamic model of an unbalanced rotor system with a

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Sinou, J. J., C. Villa, and F. Thouverez. "Experimental and Numerical Investigations of a Flexible Rotor on Flexible Bearing Supports." International Journal of Rotating Machinery 2005, no. 3 (2005): 179–89. http://dx.doi.org/10.1155/ijrm.2005.179.

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The main goal of this paper is to study, numerically and experimentally, the effects of the bearing support flexibility on the rotor dynamic and the first forward and backward critical speeds. The test rig which is used in this study has been developed and built at the École Centrale de Lyon (France). This flexible rotor, supported by two rolling bearings on flexible supports, is used for three configurations of the flexible supports. The support characteristics are determined experimentally by performing static tests. Moreover, a finite element model of this flexible rotor is presented which

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Filippatos, Angelos, Martin Dannemann, Minh Nguyen, Daniel Brenner, and Maik Gude. "Influence of Ice Accumulation on the Structural Dynamic Behaviour of Composite Rotors." Applied Sciences 10, no. 15 (2020): 5063. http://dx.doi.org/10.3390/app10155063.

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The implementation of wind turbines as a source of sustainable, renewable energy is increasing. Although the prospects of renewable energy development are promising, ice accumulation on turbine blades still stands as a major operational issue. Excessive ice mass on turbine blades can lead to damage or total failure of the blades but also to the nacelle gearbox and to the generator. Therefore, a detailed understanding of the ice accumulation on the composite blades and the effect on their modal properties can be beneficial and give an insight before catastrophic failure occurs. On the one hand,

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San Andrés, Luis. "Hybrid Flexure Pivot-Tilting Pad Gas Bearings: Analysis and Experimental Validation." Journal of Tribology 128, no. 3 (2006): 551–58. http://dx.doi.org/10.1115/1.2194918.

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Gas film bearings offer unique advantages enabling successful deployment of high-speed microturbomachinery. Current applications encompass micro power generators, air cycle machines, and turbo expanders. Mechanically complex gas foil bearings are in use; however, their excessive cost and lack of calibrated predictive tools deter their application to mass-produced oil-free turbochargers, for example. The present investigation advances the analysis and experimental validation of hybrid gas bearings with static and dynamic force characteristics desirable in high-speed turbomachinery. These charac

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Ouyang, Wu, Xuebing Zhang, Yong Jin, and Xiaoyang Yuan. "Experimental Study on the Dynamic Performance of Water-Lubricated Rubber Bearings with Local Contact." Shock and Vibration 2018 (2018): 1–10. http://dx.doi.org/10.1155/2018/6309727.

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Accurate dynamic characteristic coefficients of water-lubricated rubber bearings are necessary to research vibration of ship propulsion system. Due to mixed lubrication state of water-lubricated rubber bearings, normal test rig and identification method are not applicable. This paper establishes a test rig to simulate shaft misalignment and proposes an identification method for water-lubricated rubber bearings, which utilizes rotor unbalanced motion to produce self-excited force rather than artificial excitation. Dynamic performance tests under different conditions are operated. The results sh

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Wang, Meiling, Baogang Wen, Qingkai Han, Yibo Sun, and Changxin Yu. "Dynamic Characteristics of a Misaligned Rigid Rotor System with Flexible Supports." Shock and Vibration 2021 (April 15, 2021): 1–16. http://dx.doi.org/10.1155/2021/8876190.

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A misaligned rigid rotor system with flexible supports differing from the traditional flexible rotor system, which refers to its practical rotating center line determined by supports offset from the theoretical one, often suffers support structure damage risk. In the present work, the dynamic characteristics of a misaligned rigid rotor system with flexible squirrel cage supports are focused, and the vibrations and the stress of its support structures under different misaligned offsets are investigated with experimental and simulated analysis. The finite element model for a rigid rotor system w

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Niccolini Marmont Du Haut Champ, Carlo Alberto, Fabrizio Stefani, and Paolo Silvestri. "Experimental and Numerical Investigation about Small Clearance Journal Bearings under Static Load Conditions." Advances in Tribology 2020 (December 4, 2020): 1–13. http://dx.doi.org/10.1155/2020/8844879.

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The aim of the present research is to characterize both experimentally and numerically journal bearings with low radial clearances for rotors in small-scale applications (e.g., microgas turbines); their diameter is in the order of ten millimetres, leading to very small dimensional clearances when the typical relative ones (order of 1/1000) are employed; investigating this particular class of journal bearings under static and dynamic loading conditions represents something unexplored. To this goal, a suitable test rig was designed and the performance of its bearings was investigated under stead

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Wu, Hua Chun, Zi Yan Wang, and Ye Fa Hu. "Study on Support Properties of Axial Maglev Blood Pump." Applied Mechanics and Materials 150 (January 2012): 187–93. http://dx.doi.org/10.4028/www.scientific.net/amm.150.187.

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Artificial heart pump requires small structure, low energy consumption and certain stiffness and damping for transplanting and long time using. This paper thus designed a hybrid-type axial maglev blood pump, which not only has small size, almost no energy, and poor dynamic characteristics of permanent magnet bearing but also has low power consumption, long life and good dynamic characteristics of magnetic bearing. Based on finite element method, magnetic flux of axial magnetic bearing, radial magnetic bearing and test rig are analyzed; at the same time, the structure parameters and mechanical

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Кухтин, Юрий Петрович, Петр Петрович Варварук та Вячеслав Михайлович Меркулов. "ЗНИЖЕННЯ РІВНЯ ДИНАМІЧНИХ НАПРУГ У РОБОЧИХ ЛОПАТКАХ ТУРБІНИ ЗА РАХУНОК ВИБОРУ ГЕОМЕТРІЇ СОПЛОВОГО АПАРАТУ". Aerospace technic and technology, № 7 (10 листопада 2018): 40–47. http://dx.doi.org/10.32620/aktt.2018.7.06.

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Interacting between the next rows of the turbine creates a circumferential flow non-uniformity, which leads to origination of resonance dynamic stresses on rotor bladings with frequencies z·fn, where fn - a rotor rotation frequency, z - number of stator vanes. At projection and development of the engine is not always possible detuning from a resonance as the spectrum of eigenfrequencies of rotor blades can be wide enough in relation to a band of working rotor speed. Reduction of exterior exciting forces can be one of ways of a reduction of dynamic stresses in rotor blades. For attenuation of t

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Chen, Yinsi, Ren Yang, Naohiro Sugita, Jianpeng Zhong, Junhong Mao, and Tadahiko Shinshi. "Estimation of the Dynamic Parameters of the Bearings in a Flexible Rotor System Utilizing Electromagnetic Excitation by a Built-In Motor." Actuators 11, no. 1 (2021): 1. http://dx.doi.org/10.3390/act11010001.

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Estimation of the dynamic parameters of bearings is essential in order to be able to interpret the performance of rotating machinery. In this paper, we propose a method to estimate the dynamic parameters of the bearings in a flexible rotor system. By utilizing the electromagnetic excitation generated by a built-in PM motor and finite element (FE) modeling of the rotor, safe, low-cost, and real-time monitoring of the bearing dynamics can be achieved. The radial excitation force is generated by injecting an alternating d-axis current into the motor windings. The FE model of the rotor and the mea

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Cakmak, O., and K. Y. Sanliturk. "A dynamic model of an overhung rotor with ball bearings." Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 225, no. 4 (2011): 310–21. http://dx.doi.org/10.1177/1464419311408949.

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A ball bearing comprising rolling elements, inner and outer rings, and a cage structure can be described as a multi-body system (MBS). In order to predict the dynamic behaviour and resonance characteristics of a rotor–ball bearing system, it can be modelled and analysed as a MBS with flexible and rigid parts. In this study, a ball bearing is modelled with MBS approach using MSC ADAMS commercial software. The Hertzian theory is used for modelling the contact dynamics between the balls and the rings. The ball bearing model is then assembled with the rotor model which comprised a shaft and a disc

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Markert, Richard, Roland Platz, and Malte Seidler. "Model Based Fault Identification in Rotor Systems by Least Squares Fitting." International Journal of Rotating Machinery 7, no. 5 (2001): 311–21. http://dx.doi.org/10.1155/s1023621x01000264.

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In the present paper a model based method for the on-line identification of malfunctions in rotor systems is proposed. The fault-induced change of the rotor system is taken into account by equivalent loads which are virtual forces and moments acting on the linear undamaged system model to generate a dynamic behaviour identical to the measured one of the damaged system.By comparing the equivalent loads reconstructed from current measurements to the pre-calculated equivalent loads resulting from fault models, the type, amount and location of the current fault can be estimated. The identification

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Forte, P., M. Paternò, and E. Rustighi. "A Magnetorheological Fluid Damper for Rotor Applications." International Journal of Rotating Machinery 10, no. 3 (2004): 175–82. http://dx.doi.org/10.1155/s1023621x04000181.

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Even though we are still far from industrial applications, in the last decade there has been increasing attention directed toward the employment of electrorheological (ER) and magnetorheological (MR) fluids in active bearings and active squeeze film dampers in rotordynamics. MR fluids react to magnetic fields undergoing reversible changes in their mechanical characteristics, viscosity, and stiffness in particular. In previous literature, some applications of ER fluids in rotor squeeze film dampers can be found; however, on the contrary, little is reported on similar test rigs set up for MR dam

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Wei, Zhan, Liu, Tao, and Yue. "Modeling and Analysis of Maximum Power Tracking of a 600 kW Hydraulic Energy Storage Wind Turbine Test Rig." Processes 7, no. 10 (2019): 706. http://dx.doi.org/10.3390/pr7100706.

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An innovative wind turbine with a particular hydraulic transmission and energy storage system is proposed in this paper. The purpose of applying the hydraulic transmission is to remove the gearbox and power converter of traditional wind turbine and cooperate on wind resource storing with the energy storage system. To overcome the volatility and intermittence shortcomings of wind and improve the output power quality, hydraulic accumulators are used as the energy storage device for wind energy regulation. The original gearbox and generator in the nacelle of a Micon 600 wind turbine were removed

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Piscaglia, Federico, Angelo Onorati, Silvia Marelli, and Massimo Capobianco. "A detailed one-dimensional model to predict the unsteady behavior of turbocharger turbines for internal combustion engine applications." International Journal of Engine Research 20, no. 3 (2018): 327–49. http://dx.doi.org/10.1177/1468087417752525.

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This article describes an investigation of the unsteady behavior of turbocharger turbines by one-dimensional modeling and experimental analysis. A one-dimensional model has been developed to predict the performance of a vaneless radial-inflow turbine submitted to unsteady flow conditions. Different from other approaches proposed in the literature, the turbine has been simulated by separating the effects of casing and rotor on the unsteady flow and by modeling the multiple rotor entries from the volute. This is a simple and effective way to represent the turbine volute by a network of one-dimen

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Jin, Long, Zhimin Zhu, Yuqi Li, Chuanmei Wen, and Dayong Yang. "Frequency Sweep Modeling Method for the Rotor-Bearing System in Time Domain Based on Data-Driven Model." Processes 10, no. 4 (2022): 679. http://dx.doi.org/10.3390/pr10040679.

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In practice, the modeling and analysis of nonlinear rotor-bearing systems are difficult due to the nonlinearity and complexity. In the previous studies, finite element simulation and mathematical modeling methods are mostly adopted to conduct the analysis. However, due to the time-consuming problem in finite element simulation and the lack of sufficient prior knowledge in mathematical modeling, the traditional method is difficult to establish the representation model. In order to overcome this issue, in this study, a data-driven model referred to as the NARX (Nonlinear Auto-Regressive with exo

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Babin, Alexander, Leonid Savin, and Sergey Majorov. "Dynamic Characteristics of Rotors on Passive and Active Thrust Fluid-film Bearings with Fixed Pads." MATEC Web of Conferences 148 (2018): 11003. http://dx.doi.org/10.1051/matecconf/201814811003.

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Application of fluid-film bearings in rotor machines in many cases could have no alternative due to obvious advantages when compared to roller element bearings. Integration of information technology in mechanical engineering resulting in emergence of a new field of research – mechatronic bearings which allowed tracking condition of the most important parts of a machine and adjusting operational parameters of the system. Application of servo valves to control the flow rate through a fluid-film bearing is the most universal and simple way of rotor’s position control due to relative simplicity of

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