Log in

Relevant bibliographies by topics / Rotor rotation / Journal articles

To see the other types of publications on this topic, follow the link: Rotor rotation.

Journal articles on the topic 'Rotor rotation'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Rotor rotation.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Hou, Xukui, Ende Wang, Hui Cao, Yalong Zhu, and Kai Qi. "Research on Dynamic Balance Adjustment Method of Single Braced Frame Gyroscope Rotor." MATEC Web of Conferences 256 (2019): 02005. http://dx.doi.org/10.1051/matecconf/201925602005.

Full text

Abstract:

The uneven mass distribution of gyro rotors results in vibration, rotation and drift of gyro rotors, which seriously affect the performance index and life of gyro rotors. However, because there is no rigid connection between the rotary shaft and the shell of the gyro rotor, the dynamic balancing machine can only balance the vibration component of the single braced frame gyroscope rotor, and can’t measure the gyro rotor’s rotation component. By analyzing the influence of uneven rotor mass distribution on the gyro rotor performance, a method of eliminating two rotational degrees of freedom of th

APA, Harvard, Vancouver, ISO, and other styles

2

Englberger, Antonia, Linus Wrba, Andreas Dörnbrack, and Julie K. Lundquist. "How does the rotational direction of an upwind turbine affect its downwind neighbour?" Journal of Physics: Conference Series 2265, no. 2 (2022): 022048. http://dx.doi.org/10.1088/1742-6596/2265/2/022048.

Full text

Abstract:

Abstract Wind-turbine blades rotate in clockwise direction looking downstream on the rotor. During daytime conditions of the atmospheric boundary layer, the rotational direction has no influence on the turbine wakes. In stably stratified conditions occurring during night, the atmospheric inflow is often characterized by a veering inflow describing a clockwise wind direction change with height in the Northern Hemisphere. A changing wind direction with height interacting with the rotor impacts its wake characteristics (wake elongation, width and deflection). We investigate the impact on the turb

APA, Harvard, Vancouver, ISO, and other styles

3

Luan, Hengxuan, Liyuan Weng, Ranhui Liu, Dongmin Li, and Mingwei Wang. "Axial Spacing Effects on Rotor-Rotor Interaction Noise and Vibration in a Contra-Rotating Fan." International Journal of Aerospace Engineering 2019 (February 7, 2019): 1–15. http://dx.doi.org/10.1155/2019/2125976.

Full text

Abstract:

Because of the potential technical advantages, the contra-rotation technology has become a renewed interest in aviation and other applications. Contra-rotation increases efficiency in comparison with the single-rotor design, but this advantage is not fully harnessed. The axial spacing of two-stage contra-rotating blade rows has a significant impact on a contra-rotating fan/compressor. The results show that with a contra-rotation pattern, the strong unsteadiness of two-stage rotors is caused by the rotor-rotor interaction. The unsteadiness of rotor 1 is caused by the potential disturbance, and

APA, Harvard, Vancouver, ISO, and other styles

4

Sharma, P. B., Y. P. Jain, and D. S. Pundhir. "A Study of Some Factors Affecting the Performance of a Contra-Rotating Axial Compressor Stage." Proceedings of the Institution of Mechanical Engineers, Part A: Power and Process Engineering 202, no. 1 (1988): 15–21. http://dx.doi.org/10.1243/pime_proc_1988_202_003_02.

Full text

Abstract:

An experimental investigation of the performance of a contra-rotating stage is reported. The influence of factors such as speed ratio of the two rotors, rotor stagger, pitch-chord ratio and axial spacing between the rotors is examined from tests on a 0.66 hub-tip ratio compressor. The study reveals that the performance of a contra-rotating stage is affected by all these factors. Axial spacing between the rotors and the speed ratio of the rotors both exhibit a strong influence on the stalling behaviour of the stage. It has been found that in a stage with close axial gap, rotating stall on the f

APA, Harvard, Vancouver, ISO, and other styles

5

Lu, Wenxin, Tiantian Mu, Yuehong Zhang, et al. "A Photocontrolled Molecular Rotor Based on Azobenzene-Strapped Mixed (Phthalocyaninato)(Porphyrinato) Rare Earth Triple-Decker." Molecules 30, no. 2 (2025): 326. https://doi.org/10.3390/molecules30020326.

Full text

Abstract:

Effectively regulating the rotary motions of molecular rotors through external stimuli poses a tremendous challenge. Herein, a new type of molecular rotor based on azobenzene-strapped mixed (phthalocyaninato)(porphyrinato) rare earth triple-decker complex Azo-1 is reported. Electronic absorption and 1H NMR spectra manifested the reversible isomerization of the rotor Azo-1 between the trans configuration and the cis configuration. The rotational behavior of phthalocyanine rotator in two configurations were investigated by VT-1H NMR experiments, and the results indicated that the phthalocyanine

APA, Harvard, Vancouver, ISO, and other styles

6

Kusaka, Takashi, and Takayuki Tanaka. "Stateful Rotor for Continuity of Quaternion and Fast Sensor Fusion Algorithm Using 9-Axis Sensors." Sensors 22, no. 20 (2022): 7989. http://dx.doi.org/10.3390/s22207989.

Full text

Abstract:

Advances in micro-electro-mechanical systems technology have led to the emergence of compact attitude measurement sensor products that integrate acceleration, magnetometer, and gyroscope sensors on a single chip, making them important devices in the field of three-dimensional (3D) attitude measurement for unmanned aerial vehicles, smartphones, and other devices. Sensor fusion algorithms for posture measurement have become an indispensable technology in cutting-edge research, such as human posture measurement using wearable sensors, and stabilization problems in robot position and posture measu

APA, Harvard, Vancouver, ISO, and other styles

7

Wang, Zeyang, Jun Huang, Mingxu Yi, and Shaoze Lu. "A Dynamic RCS and Noise Prediction and Reduction Method of Coaxial Tilt-Rotor Aircraft Based on Phase Modulation." Sensors 22, no. 24 (2022): 9711. http://dx.doi.org/10.3390/s22249711.

Full text

Abstract:

For tilt-rotor aircraft with coaxial rotors (coaxial rotor aircraft), reduction of radar cross section as well as acoustic noise can be essential for stealth design, and the rotation of the coaxial rotors can have an influence on noise and dynamic radar cross section (RCS) characteristics. In this paper, an approach to the prediction of both the sound pressure level (SPL) of noise and the dynamic RCS of coaxial-tilt aircraft is carried out, based on the theories of the FW-H equation, the physics optics method (PO) and the physical theory of diffraction (PTD) method. In order to deal with the r

APA, Harvard, Vancouver, ISO, and other styles

8

Samokhvalov, Vladimir N. "Self-excitation of non-synchronous rotation of closely spaced unbalanced rotors." Journal of Dynamics and Vibroacoustics 10, no. 3 (2024): 19–28. http://dx.doi.org/10.18287/2409-4579-2024-10-3-19-28.

Full text

Abstract:

The results of experimental studies of the process of self-excitation of rotation with close coaxial arrangement of thin-walled disks, as well as rigidly and movably installed screens coaxially located with them, are considered and analyzed. Self-excitation of rotation was observed only when one dynamically unbalanced rotor (disk) rotated with a frequency of more than 50...150 Hz and when circular vibration of an initially non-rotating second rotor (disk or screen) was excited, located coaxially at a distance of 1...4 mm from it on a common rigid base. The self-excitation of the rotation of th

APA, Harvard, Vancouver, ISO, and other styles

9

Ishimatsu, Takakazu, Takashi Shimomachi, and Nobuyoshi Taguchi. "Active Control for Whirling Motion of Flexible Rotor." Journal of Robotics and Mechatronics 3, no. 4 (1991): 360–64. http://dx.doi.org/10.20965/jrm.1991.p0360.

Full text

Abstract:

In a rotational machine, unbalance on the rotor is formidable since it causes resonance synchronized with the rotation of the rotor. In order to suppress this unfavorable vibration, we built an active vibration control system of flexible rotor using an electromagnetic damper. Our control system is composed of a digital controller to suppress the rotationally synchronized whirling motion and also a conventional analogue controller. Using our control system, whirling motion of the rotor under various rotating speeds was suppressed significantly.

APA, Harvard, Vancouver, ISO, and other styles

10

Peng, Jifeng. "Effects of Aerodynamic Interactions of Closely-Placed Vertical Axis Wind Turbine Pairs." Energies 11, no. 10 (2018): 2842. http://dx.doi.org/10.3390/en11102842.

Full text

Abstract:

In this study, a numerical model was developed to study the effects of aerodynamic interactions between a pair of counter-rotating vertical axis wind turbines (VAWTs) in close proximity. In this model, the rotor rotation is not prescribed as a constant as in most other studies, but is determined by the moment of inertia and the total torque of the rotor, including the aerodynamic torque, generator torque, and a torque representing friction. This model enables study of the behavior of the rotor under an arbitrary ambient wind profile. The model was applied to an isolated rotor with five straigh

APA, Harvard, Vancouver, ISO, and other styles

11

Ueda, Y. "Numerical analysis of flow-induced rotation of an S-shaped rotor." Journal of Fluid Mechanics 867 (March 21, 2019): 77–113. http://dx.doi.org/10.1017/jfm.2019.144.

Full text

Abstract:

Flow-induced rotation of an S-shaped rotor is investigated using an adaptive numerical scheme based on a vortex particle method. The boundary integral equation with respect to Bernoulli’s function is solved using a panel method for obtaining the pressure distribution on the rotor surface which applies the torque to the rotor. The present work first addresses the validation of the scheme against the previous studies of a rotating circular cylinder. Then, we compute the automatic rotation start of an S-shaped rotor from a quiescent state for various values of the moment of inertia. The computed

APA, Harvard, Vancouver, ISO, and other styles

12

Hara, Yutaka, Yoshifumi Jodai, Tomoyuki Okinaga, and Masaru Furukawa. "Numerical Analysis of the Dynamic Interaction between Two Closely Spaced Vertical-Axis Wind Turbines." Energies 14, no. 8 (2021): 2286. http://dx.doi.org/10.3390/en14082286.

Full text

Abstract:

To investigate the optimum layouts of small vertical-axis wind turbines, a two-dimensional analysis of dynamic fluid body interaction is performed via computational fluid dynamics for a rotor pair in various configurations. The rotational speed of each turbine rotor (diameter: D = 50 mm) varies based on the equation of motion. First, the dependence of rotor performance on the gap distance (gap) between two rotors is investigated. For parallel layouts, counter-down (CD) layouts with blades moving downwind in the gap region yield a higher mean power than counter-up (CU) layouts with blades movin

APA, Harvard, Vancouver, ISO, and other styles

13

Biryuk, Andrey, Mikhail Drobotenko, Igor Ryadchikov, and Alexander Svidlov. "Optimal Gyrodine Rotor Shape in the Class of Conical Bodies." Mathematical Physics and Computer Simulation, no. 4 (February 2021): 69–81. http://dx.doi.org/10.15688/mpcm.jvolsu.2020.4.7.

Full text

Abstract:

The problem is to find the optimal shape of the gyrodine rotor and its angular rotation speed that maximizes the angular momentum relative to the axis of rotation at a fixed radius, mass and material of the rotor, taking into account the final strength of the material. The gyrodine rotor is a body of revolution, the thickness of which depends only on the distance r to the axis of rotation, r ∈ [0,R], where R is the radius of the rotor. The rotor surface is defined by rotating the curves z = ±z(r) around the axis. When the rotor is spinning, it undergoes deformation due to centrifugal forces. N

APA, Harvard, Vancouver, ISO, and other styles

14

Manas, MP, and AM Pradeep. "Stall inception mechanisms in a contra-rotating fan operating at different speed combinations." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 234, no. 8 (2019): 1041–52. http://dx.doi.org/10.1177/0957650919893831.

Full text

Abstract:

Contra-rotating fan is a concept that can possibly replace the present-day conventional fans due to its several aerodynamic advantages. It has the potential to improve the stability limit and can achieve a higher pressure ratio per stage. One of the advantages of a contra-rotating fan is its capability to operate both the rotors at different speeds. In the present study, experiments are carried out at different speed combinations of the rotors and the stall inception phenomenon is captured using high-response unsteady pressure sensors placed on the casing upstream of the leading edge of rotor-

APA, Harvard, Vancouver, ISO, and other styles

15

Shchur, Ihor, Volodymyr Klymko, Shengbai Xie, and David Schmidt. "Design Features and Numerical Investigation of Counter-Rotating VAWT with Co-Axial Rotors Displaced from Each Other along the Axis of Rotation." Energies 16, no. 11 (2023): 4493. http://dx.doi.org/10.3390/en16114493.

Full text

Abstract:

In this paper, dual-rotor counter-rotating (CR) configurations of vertical axis wind turbines (VAWTs) are briefly inspected and divided into three types. This investigation was focused on one of these types—the CR-VAWT with co-axial rotors, in which two equal rotors are placed on the same shaft, displaced from each other along it and rotated in opposite directions. For this CR-VAWT with three-blade H-Darrieus rotors, the properties of the design in terms of aerodynamics, mechanical transmission and electric generator, as well as control system, are analyzed. A new direct-driven dual-rotor perm

APA, Harvard, Vancouver, ISO, and other styles

16

Levy, Yeshayahou, Asaf Modelevsky, Joseph Pismenny, Jens Friedrichs, and Detlev Wulff. "Links between Main Frequencies of Established Rotating Stall and Rotational Frequencies and/or Blade Passing Frequencies." International Journal of Rotating Machinery 2013 (2013): 1–11. http://dx.doi.org/10.1155/2013/283930.

Full text

Abstract:

The ratios between the main frequency of rotating stall and rotational frequency may be considered in the form of exact ratios of small natural numbers if the pressure signals in compressors during rotating stall include the rotor rotation frequency component. During rotating stall in compressors with good rotor balancing (with absence of the rotational frequency component in the frequency characteristics of pressure signals), these ratios between the main frequency of rotating stall and rotational frequency are or are not in the form of ratios of small natural numbers. The experimentally rece

APA, Harvard, Vancouver, ISO, and other styles

17

Kurshubadze, Tsiuri, and Makvala Bekirishvili. "The Use of Wind Turbines in Ports and Sea Vessels." Georgian Maritime Scientific Journal 1, no. 1 (2021): 111–16. http://dx.doi.org/10.70791/gmsj.1.2021.2829.

Full text

Abstract:

The technical result of the research of presented wind turbine is simplification and rise of the practical application of its main body – the rotor construction, which shall be achieved via transformation of wind shifting movement into rotating movement is implemented by rotor blades, which present bent or inclined shape plates and during rotation, these plates are not influenced with decelerating resistance of surrounding air.The technical novelty of the turbine construction is presented with the following features: each profile blade of the rotor presents concave arc placed eccentrically tow

APA, Harvard, Vancouver, ISO, and other styles

18

Zaytsev, Nikolay, Denis Zaytsev, Andrey Makarov, and Dmitriy Mineev. "NUMERICAL SIMULATION OF THE DYNAMICS OF A FLEXIBLE ROTOR WITH TWO BALL AUTO-BALANCERS." Perm National Research Polytechnic University Aerospace Engineering Bulletin, no. 62 (2020): 31–44. http://dx.doi.org/10.15593/2224-9982/2020.62.04.

Full text

Abstract:

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 dynam

APA, Harvard, Vancouver, ISO, and other styles

19

Liu, Yi, Heng Liu, and Bowen Fan. "Numerical analysis on the static–dynamic coupling influences of parallelism flaw in disc-rod rotor ball bearing system." Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 232, no. 1 (2017): 103–12. http://dx.doi.org/10.1177/1464419317710886.

Full text

Abstract:

The static–dynamic coupling influences of parallelism flaw are investigated in the disc-rod rotor ball bearing system. Three-dimensional finite element method and a contact solving method are combined to analyze the statics of flawed disc-rod rotor. This analysis shows that parallelism flaw causes mass eccentric and rotation-dependent rotor bow. When these dynamic factors are involved, parallelism flaw promotes the nonlinear complexity in high speed and reduces global stability areas for the flawed disc-rod rotor. Unstable motions are more likely to happen when rotating speed exceeds the criti

APA, Harvard, Vancouver, ISO, and other styles

20

Li, Chao Feng, Shi Hua Zhou, and Jie Liu. "Numerical Simulation of a Bending-Torsion Coupling Gear Transmission System." Applied Mechanics and Materials 448-453 (October 2013): 3403–7. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.3403.

Full text

Abstract:

Based on the establishment of angular contact ball bearing mechanical model, a nonlinear coupled lateral, torsional and axial dynamic model of helical gear-rotor-bearing system is established, and the dynamic differential equations of the coupled lateral-torsional-axial nonlinear vibration are deduced for imbalance rotors. The investigations are systematically carried out by oscillograms and spectrograms with rotating speed, taking into account eccentricity and nonlinear supporting by rolling bearing. The results show that the rotation frequency of the driven shaft appears in the driving shaft

APA, Harvard, Vancouver, ISO, and other styles

21

GUO, Ang, Zuo-dong HUANG, Zai-ran DING, Yi SHI, Lei JIAO, and Jian-xing LENG. "Research on Rotational Resistance Moment of Rotary Energy Recovery Device." E3S Web of Conferences 53 (2018): 02001. http://dx.doi.org/10.1051/e3sconf/20185302001.

Full text

Abstract:

The effects of operational conditions on the resistance moment of a rotary energy recovery device have been systematically investigated through the computational fluid dynamics in this paper. Based on the structural characteristics of the rotary energy recovery device, the hydro-static bearing was established on both sides of the rotor. Simulation results indicate that for the rotation resistance moment generated by the rotor internal flow path, the rotation speed is linearly positive with the rotational resistance moment. For the rotation resistance moment generated by the clearance flow, the

APA, Harvard, Vancouver, ISO, and other styles

22

Muszynska, Agnes, Charles T. Hatch, and Donald E. Bently. "Dynamics of Anisotropically Supported Rotors." International Journal of Rotating Machinery 3, no. 2 (1997): 133–42. http://dx.doi.org/10.1155/s1023621x97000134.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

23

Vityazev, V. V. "The ROTOR: Rotation of Frames Via Representation of Systematic Differences in Terms of Spherical Functions." International Astronomical Union Colloquium 165 (1997): 463–74. http://dx.doi.org/10.1017/s0252921100046960.

Full text

Abstract:

AbstractThe paper presents a method to derive rotational angles between two reference frames from the systematic differences represented in terms of spherical functions – hereafter referred to as the ROTOR (ROTation by Orthogonal Representation). It is shown that the ROTOR is preferable over the least-squares technique since it (a) takes into account only the harmonics which correspond to rotation, (b) tests them for pure rotation, and (c) discovers the existence of quasirotational terms which may smear rotation. Due to these properties the ROTOR yields realistic results even in the case when

APA, Harvard, Vancouver, ISO, and other styles

24

Fletcher, T. M., and R. E. Brown. "Modelling the interaction of helicopter main rotor and tail rotor wakes." Aeronautical Journal 111, no. 1124 (2007): 637–43. http://dx.doi.org/10.1017/s0001924000004814.

Full text

Abstract:

Abstract The mutual interaction between the main rotor and tail rotor wakes is central to some of the most problematic dynamic phenomena experienced by helicopters. Yet achieving the ability to model the growth and propagation of helicopter rotor wakes with sufficient realism to capture the details of this interaction has been a significant challenge to rotorcraft aerodynamicists for many decades. A novel computational fluid dynamics code tailored specifically for rotorcraft applications, the vorticity transport model, has been used to simulate the interaction of the rotors of a helicopter wit

APA, Harvard, Vancouver, ISO, and other styles

25

Al, Al, Arfita Yuana Dewi, and Taufal Hidayat. "The lifting force relationship of a BLDC motor rotor system to the blade rotation speed." MATEC Web of Conferences 215 (2018): 01013. http://dx.doi.org/10.1051/matecconf/201821501013.

Full text

Abstract:

In developing the knowledge and information about the Quadcopter aircraft, the parameters related to aircraft lift capability factors; fly long; flying high; type of motor; the type of propeller; including the sensors and control systems used. To find out of the BLDC motor voltage source to the rotor angle velocity (ω) relationship; rotor speed to wind velocity through rotor (v); rotor speed to rotor lift (Ft); wind speed to rotor lift; push the following rotor (Ct).Test and measurement results data show that; the lift force generated with rotational speed relationship is not proportional Nonl

APA, Harvard, Vancouver, ISO, and other styles

26

Fuh, Jon‐Shen, Brahmananda Panda, and David A. Peters. "Assembly of Finite‐Element Helicopter Subsystems with Large Relative Rotations." Journal of the American Helicopter Society 35, no. 2 (1990): 60–68. http://dx.doi.org/10.4050/jahs.35.60.

Full text

Abstract:

A general finite‐element procedure is presented for modeling rotorcraft undergoing elastic deformations in addition to large rigid body motions with respect to inertial space. Special attention is given to the coupling of the rotor and fuselage subsystems subject to large relative rotations. Initially, the rotor and fuselage subsystems are assembled separately as small‐rotation finite‐element models in a moving coordinate system. In order to handle large rigid body rotations, the coordinate systems are tied to the structure using one of several alternate constraint methods. Finally, the equati

APA, Harvard, Vancouver, ISO, and other styles

27

Zhao, Shuaike, and Hua Su. "Performance Analysis of the Cylinder Gas Film Seal between Dual-Rotor Reverse Shafts Considering Lubrication and Centrifugal Expansion Effects." Applied Sciences 13, no. 5 (2023): 3076. http://dx.doi.org/10.3390/app13053076.

Full text

Abstract:

The cylinder gas film seal between dual-rotor reverse shafts is a new method for sealing aircraft engines that has excellent developmental prospects. We propose a novel method for determining if the sealing ring is fully fluid-lubricated using the average Reynolds equation. Considering surface roughness and centrifugal expansion, we calculated the dynamic pressure, gas film force and friction power consumption with and without inlet pressure differences for each of the four rotation modes. The gas film’s dynamic pressure effects were weakest when the dual rotors rotated in a reverse direction

APA, Harvard, Vancouver, ISO, and other styles

28

Abdul Muis Prasetia, Linda Sartika, and Danny Arans Sevri Andika. "Design and Implementation of A Forward-Reverse Double-Speed Three-Phase Induction Motor Control System Based on A Programmable Logic Controller." Journal of Emerging Supply Chain, Clean Energy, and Process Engineering 3, no. 2 (2024): 93–102. https://doi.org/10.57102/jescee.v3i2.92.

Full text

Abstract:

The Dahlander motor is an asynchronous AC motor that operates at two or more distinct rotational speeds, making it different from standard three-phase motors, which generally maintain a single speed under the same power conditions. This motor features a squirrel-cage rotor design and is integrated with a programmable logic controller (PLC), which simplifies wiring systems and allows operational adjustments without altering the wiring layout. However, an additional component, the selector switch, is also employed. This switch controls the motor's rotational direction, enabling it to rotate eith

APA, Harvard, Vancouver, ISO, and other styles

29

Teyi, Nabam, and Sandeep Singh. "Study of active magnetic bearings (AMB) on non–synchronous rotors." IOP Conference Series: Materials Science and Engineering 1272, no. 1 (2022): 012021. http://dx.doi.org/10.1088/1757-899x/1272/1/012021.

Full text

Abstract:

A rotor is never free from vibration owing to constant centrifugal force acting on it while rotating. A practical rotor has inherent mass unevenness flaw, or bearing misalignment flaw, or self-weight bow flaw, or presence of discontinuity or cracks flaw. If the vibrations are not controlled within limits, the rotor’s purpose of existence is lost. These vibrations can be synchronous if the frequency of vibration is equal to, or multiple of, the speed of rotation of the rotor. Or may be non-synchronous if the frequency of vibration of the rotor is not a multiple of its rotational frequency. Acti

APA, Harvard, Vancouver, ISO, and other styles

30

Maeng, D. J., J. S. Lee, R. Jakoby, S. Kim, and S. Wittig. "Characteristics of Discharge Coefficient in a Rotating Disk System." Journal of Engineering for Gas Turbines and Power 121, no. 4 (1999): 663–69. http://dx.doi.org/10.1115/1.2818523.

Full text

Abstract:

The discharge coefficient of a long orifice in a rotating system is measured to examine the rotational effect on discharge behavior. The rotating system is comprised of a rotating disk and two stators on both sides of the rotating disk. Test rig is constructed to simulate the real turbine operating conditions. Pressure ratios between upstream and downstream cavities of the orifice range from 1.05 to 1.8, and rotational speed of the rotor disk is varied up to 10,000 rpm. The orifice hole bored through the rotor disk has length-to-diameter ratio of 10. For a better interpretation of discharge be

APA, Harvard, Vancouver, ISO, and other styles

31

Karimipanah, M. T., and E. Olsson. "Calculation of Three-Dimensional Boundary Layers on Rotor Blades Using Integral Methods." Journal of Turbomachinery 115, no. 2 (1993): 342–53. http://dx.doi.org/10.1115/1.2929240.

Full text

Abstract:

The important effects of rotation and compressibility on rotor blade boundary layers are theoretically investigated. The calculations are based on the momentum integral method and results from calculations of a transonic compressor rotor are presented. Influence of rotation is shown by comparing the incompressible rotating flow with the stationary one. Influence of compressibility is shown by comparing the compressible rotating flow with the incompressible rotating one. Two computer codes for three-dimensional laminar and turbulent boundary layers, originally developed by SSPA Maritime Consult

APA, Harvard, Vancouver, ISO, and other styles

32

Numanoy, Nitisak, and Jiraphon Srisertpol. "Vibration Reduction of an Overhung Rotor Supported by an Active Magnetic Bearing Using a Decoupling Control System." Machines 7, no. 4 (2019): 73. http://dx.doi.org/10.3390/machines7040073.

Full text

Abstract:

Overhung rotors are important for use in industrial turbo-machines. The effects of a lateral force can increase as a result of the rotor weight, misalignment, or the operating speed of the suspension system for which the rotor is carrying a transmission connection. In this paper, the reduction of vibration in supported lateral directions by varying control is discussed in a radial active magnetic bearing system (AMBS). An experimental test was conducted on the orbital response of an overhung rotor supported by an AMBS, to provide an alternative for improving precision. To simplify the system d

APA, Harvard, Vancouver, ISO, and other styles

33

Ahmedbacha, M. R., A. Benouar, A. Khorsi, N. Akermi, and K. Kaddouri. "Simulation of Tomographic Acquisition and Reconstruction Slice for Industrial Machine Rotor with Fixed-Angle Scanner." Materials Evaluation 80, no. 8 (2022): 38–44. http://dx.doi.org/10.32548/2022.me-04263.

Full text

Abstract:

Rotating machines such as electric motors and pumps are the heart of any industrial production chain. Rotors are usually the most worn parts, and the preventive maintenance of these vital organs, although necessary, remains penalizing for the production line because the machines are stopped and disassembled for a lengthy period during the inspection phase. This paper suggests a simulation of optimized tomographic reconstruction by cone beam acquisition geometry to scan a functioning machine rotor with high X-ray energy. In this work we propose a simple design of a fixed-angle projection scanne

APA, Harvard, Vancouver, ISO, and other styles

34

Bekinal, Siddappa I., Sadanand S. Kulkarni, and Soumendu Jana. "A hybrid (permanent magnet and foil) bearing set for complete passive levitation of high-speed rotors." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 20 (2016): 3679–89. http://dx.doi.org/10.1177/0954406216652647.

Full text

Abstract:

This paper presents the design and development of a hybrid bearing set for complete passive levitation of a typical rotor. A hybrid bearing set consists of permanent magnet thrust bearing and radial discrete bump foil bearings. The permanent magnet thrust bearing is made up of three pairs of ring magnets arranged in rotation magnetized direction. The mathematical model to determine the force and stiffness in rotation magnetized direction configuration is presented using Coulombian model and vector approach. Bump foil bearings are designed and developed for rotor weight to provide the radial su

APA, Harvard, Vancouver, ISO, and other styles

35

Efimov, V. V., V. A. Ivchin, and K. O. Chernigin. "Research of the crosswind effect on the single-rotor helicopter unintentional yaw rotation." Civil Aviation High Technologies 27, no. 4 (2024): 20–33. http://dx.doi.org/10.26467/2079-0619-2024-27-4-20-33.

Full text

Abstract:

During the operation of single-rotor helicopters, aviation accidents quite frequently occur in the form of an unintentional turn or even a yaw rotation, causing, as a rule, a ground collision. Numerous researchers of this problem consider the loss of helicopter tail-rotor effectiveness due to wind effects as one of its possible causes. There is even a special term – the Loss of Tail Rotor Effectiveness (LTE) in the foreign literature. Hence, this paper deals with an attempt to determine the capacity of an unintentional single-rotor helicopter yaw rotation occurrence due to wind effects (the im

APA, Harvard, Vancouver, ISO, and other styles

36

Abramov, Y. N., S. N. Borychev, M. Y. Kostenko, M. B. Uglanov, A. A. Tsymbal, and Y. A. Yudaev. "Optimization of the energy consumption of the shredder of the tops for the sustainable development of agriculture." IOP Conference Series: Earth and Environmental Science 965, no. 1 (2022): 012001. http://dx.doi.org/10.1088/1755-1315/965/1/012001.

Full text

Abstract:

Abstract To optimize energy costs during the cutting process, a mathematical model is constructed and the calculation results are studied to optimize the cutting process. The proposed model is built for the operation of the rotor of the haulm shredder, but the technique of its construction can be used for any systems in which rotational movements are used to cut plants. A method for constructing a rotation model of the haulm shredder rotor with respect to two centers of rotation is presented. The method is based on the solution of differential equations of motion, the theorem on the center of

APA, Harvard, Vancouver, ISO, and other styles

37

Tkachuk, Mykola M., Andrey Grabovskiy, Oleksandr Shut, et al. "STRESS-STRAIN STATE AND CRITICAL ROTATIONAL VELOCITIES OF AIR BLOWER ROTOR PART OF A HIGH BOOST ENGINE." Bulletin of the National Technical University «KhPI» Series: Engineering and CAD, no. 1 (December 28, 2022): 115–38. http://dx.doi.org/10.20998/2079-0775.2022.1.11.

Full text

Abstract:

The stress-strain state and critical rotation speeds of the air blower rotor part of highly forced engine are investigated. For this purpose, their parametric geometric and finite-element models are built. Due to the high speeds of rotation, the impeller disk acquires an umbrella-shaped deformed shape. This deformation can cause a gap to be selected between the impellers and the stator of the supercharger. In areas of abrupt change of shape on the impeller there is a concentration of stresses. In addition, the supercharger impeller is located cantilevered. This causes low critical speeds. Thes

APA, Harvard, Vancouver, ISO, and other styles

38

Petrov, Aleksei A., Aleksei V. Makarov, Valeriy G. Makarov, and Nikita Yu Grigoriev. "SYNCHRONOUS MOTOR WITH INCREASED ROTOR SPEED." Vestnik Chuvashskogo universiteta, no. 3 (September 25, 2020): 125–31. http://dx.doi.org/10.47026/1810-1909-2020-3-125-131.

Full text

Abstract:

Development of the design of a synchronous electric motor with six C-shaped stator teeth, the rotor axis of rotation of which is displaced relative to the axis of rotation of the output shaft. The rotational speed of the output shaft is equal to twice the rotational speed of the stator magnetic flux. Determination of the phase shifts of the supply voltages in time and the spatial position of the stator windings. Visualization of the principle of operation of the electric motor under consideration, namely, step-by-step observation of the position of the rotor in space, when the sinusoidal volta

APA, Harvard, Vancouver, ISO, and other styles

39

Owen, J. M. "An Approximate Solution for the Flow Between a Rotating and a Stationary Disk." Journal of Turbomachinery 111, no. 3 (1989): 323–32. http://dx.doi.org/10.1115/1.3262275.

Full text

Abstract:

The linear Ekman-layer equations are solved for the case of a rotor-stator system with a superimposed radial outflow of fluid. For laminar flow, the predicted rotational speed of the core between the boundary layers on the rotor and stator agrees well with existing experimental measurements when the superimposed flow rate is zero, but the theoretical solutions underestimate the core rotation when the flow rate is nonzero. For turbulent flow, the linear theory underestimates the core rotation under all conditions. Solutions of the turbulent momentum-integral equations for the rotor are used to

APA, Harvard, Vancouver, ISO, and other styles

40

Mathew, Bilji C., Prasun Banerjee, Muhammad Fawaz, Samprit Roy, Aritra Laha, and Manasa Bhatt. "A Review on Vibration Analysis of Helicopter Rotor Blade." International Journal for Research in Applied Science and Engineering Technology 10, no. 2 (2022): 1363–69. http://dx.doi.org/10.22214/ijraset.2022.40533.

Full text

Abstract:

Abstract: Vibration has always been a major disturbance for helicopter. Vibrations, thus, a threat to components of helicopter. The vibration created by a helicopter draws a great contribution to the reduction in life of the components. Reducing the vibration that creates from helicopter rotor blades, tail rotors is a one step closer to this crisis. Helicopter Vibration control is a topic of research into designing helicopter rotor blade which can be operated more efficiently. The major source of the vibration come from the rotor blade rotation. By trying to upgrade new design in the helicopte

APA, Harvard, Vancouver, ISO, and other styles

41

Ren, Zheng Yi, Jing Na Liu, Qing Fen Li, and Ke Fei Li. "Finite Element Analysis of Composite Flywheel with Two-Layer Pre-Stressed Rotor Structure." Key Engineering Materials 488-489 (September 2011): 134–37. http://dx.doi.org/10.4028/www.scientific.net/kem.488-489.134.

Full text

Abstract:

In this paper, considering the material properties of the composite flywheel and the characteristics of the pre-stressed structure, stresses and strains induced by rotor rotation and interference fit were calculated by finite element (FE) method based on the plane stress hypothesis, in the commercial software ANSYS. Based on the given material properties and the main dimension with a certain speed of rotation, three 2D FE-models of hybrid composite flywheel rotors with two-layer rotor structure were built with the unit property of plane stress, axisymmetric and plane strain respectively. Follo

APA, Harvard, Vancouver, ISO, and other styles

42

Hou, Guoqiang, Hua Su, and Guoding Chen. "An analysis method for the performance of compliant cylindrical intershaft gas film seal considering centrifugal expansion effect." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 236, no. 6 (2021): 2728–39. http://dx.doi.org/10.1177/09544062211035419.

Full text

Abstract:

A compliant cylindrical gas film seal has the potential to adapt to the complex operating conditions of a dual-rotor aeroengine, with radial runout and eccentricity, due to its special structural characteristics. To accurately investigate the seal performance of a compliant cylindrical gas film seal on dual-rotor shafts, an aeroelastic coupling method is proposed. This method analyzes the performance of a compliant cylindrical intershaft gas film seal by taking the centrifugal expansion effect into consideration. The seal performance under homodromy and counter-rotating conditions, with and wi

APA, Harvard, Vancouver, ISO, and other styles

43

Zhang, Lei, and Abraham Engeda. "Numerical simulation of rotating stall in a two-stage axial fan." Thermal Science 22, Suppl. 2 (2018): 655–63. http://dx.doi.org/10.2298/tsci171025050z.

Full text

Abstract:

Computational fluid dynamics calculations using high-performance parallel computing were conducted to simulate the prestall flow of a two-stage axial fan. The simulations were run with a full-annulus grid that models the 3-D, viscous, unsteady blade row interaction without the need for an artificial inlet distortion to induce stall. The simulation shows the initiation and development of the stall inception in two rotors of the axial fan. The results show that the stall inception first occurs in the second stage. The spike-type stall inception occurred in the second stage, which is different fr

APA, Harvard, Vancouver, ISO, and other styles

44

Gupta, Rajat, Bachu Deb, and R. D. Misra. "Performance Analysis of a Helical Savonius Rotor with Shaft at 45° Twist Angle Using CFD." Mechanical Engineering Research 3, no. 1 (2013): 118. http://dx.doi.org/10.5539/mer.v3n1p118.

Full text

Abstract:

Helical Savonius rotor is considered to be superior to conventional Savonius rotor in terms of higher power coefficient (Cp) and better starting characteristic. However studies related to helical Savonius rotors is few. In view of this, in this paper, the performance of a helical Savonius rotor with shaft at 45° bucket twist angle for one complete cycle of rotation was analyzed using Computational Fluid Dynamics. A two-bucket helical Savonius rotor with shaft was designed using GAMBIT, having a height of 60 cm and diameter of 17 cm with 45° bucket twist angle. A three dimensional Computational

APA, Harvard, Vancouver, ISO, and other styles

45

Tkachuk, Mykola А., Andrey Grabovskiy, Nickolay Prokopenko, et al. "SENSITIVITY OF STRENGTH, RIGID AND DYNAMIC CHARACTERISTICS OF THE CONSOLE ROTOR TO VARIATION OF DESIGN PARAMETERS." Bulletin of the National Technical University «KhPI» Series: Engineering and CAD, no. 1 (December 30, 2021): 104–13. http://dx.doi.org/10.20998/2079-0775.2021.1.13.

Full text

Abstract:

The analysis sensitivity of strength, rigid and dynamic characteristics of the console rotor to variation of design parameters in paper describes The speed of rotation of the shaft, the material of the impeller vary. The dependences of radial and axial displacements on the angular velocities of rotation and the modulus of elasticity of the impeller material are established. For objects of the type of rotary systems with a cantilever arrangement of the impeller, not one, but a set of criteria has been introduced into consideration, which should be taken into account in the research of this type

APA, Harvard, Vancouver, ISO, and other styles

46

Buana, Setiadi Wira, Putty Yunesti, Guna Bangun Persada, and Abdul Muhyi. "Desain Turbin Angin Horisontal untuk Area Kecepatan Angin Rendah dengan Airfoil S826." Journal of Science and Applicative Technology 4, no. 2 (2020): 86. http://dx.doi.org/10.35472/jsat.v4i2.272.

Full text

Abstract:

This research aims to determine performance of turbine rotor performance with a single rotor blade model with a diameter of 0.6 m that has been developed by NORCOWE, while for turbine rotor blades used is the NREL S826 airfoil series. The wind turbines are operated at wind speed intervals of 1-5 m / s. This parameter will also present data in the form of the optimal point of wind turbine rotation and rotor rotation speed. The pitch angles used are 25 °, 30 °, and 35 °. The pitch angle that affects the value of the ideal rotational speed with the highest optimization for the horizontal airfoil

APA, Harvard, Vancouver, ISO, and other styles

47

Englberger, Antonia, Andreas Dörnbrack, and Julie K. Lundquist. "Does the rotational direction of a wind turbine impact the wake in a stably stratified atmospheric boundary layer?" Wind Energy Science 5, no. 4 (2020): 1359–74. http://dx.doi.org/10.5194/wes-5-1359-2020.

Full text

Abstract:

Abstract. Stably stratified atmospheric boundary layers are often characterized by a veering wind profile, in which the wind direction changes clockwise with height in the Northern Hemisphere. Wind-turbine wakes respond to this veer in the incoming wind by stretching from a circular shape into an ellipsoid. We investigate the relationship between this stretching and the direction of the turbine rotation by means of large-eddy simulations. Clockwise rotating, counterclockwise rotating, and non-rotating actuator disc turbines are embedded in wind fields of a precursor simulation with no wind vee

APA, Harvard, Vancouver, ISO, and other styles

48

Dymov, Ilya, and Denis Kotin. "Active Stabilization of Axial Position of Rotor in Electric Machine." Applied Mechanics and Materials 698 (December 2014): 141–43. http://dx.doi.org/10.4028/www.scientific.net/amm.698.141.

Full text

Abstract:

The article is devoted to the development of technical solutions centering the axis of rotation of the rotor of the electric motor during movement. Focuses on the problem of optimization of the axis of rotation of an electric machine rotor. The existing types of current unbalances of rotating part of electric machine and their causes are considered. It is specified that the methods used in practice balancing, do not meet the requirements of modern high-precision industries. A new solution to the problem of stabilization of the axial position of the rotating electric machine is suggested.

APA, Harvard, Vancouver, ISO, and other styles

49

Pervushin, Vladimir F. "Classification of rotary cultivation tools of agricultural machines and their motion trajectories." Agricultural Engineering, no. 3 (2023): 57–64. http://dx.doi.org/10.26897/2687-1149-2023-3-57-64.

Full text

Abstract:

The rotary machines and implements used for the cultivation of agricultural crops do not fully meet the agrotechnical requirements. To determine the parameters of the working tools, the authors studied the absolute trajectory of their movement and classified rotary working tools of agricultural machines according to the special location of their rotation axis, dividing them into four groups and seven subgroups: A – the first group of rotors with a horizontal-transverse axis of rotation; B – the second group of rotors with a vertical axis of rotation; C – the third group of rotors with a longit

APA, Harvard, Vancouver, ISO, and other styles

50

Liu, Xiangyi, Shuyan Liu, Jing Wu, Shansong Song, and Guocai Hu. "An Analytical Method for Coaxial Helicopter Ground Resonance." MATEC Web of Conferences 316 (2020): 04005. http://dx.doi.org/10.1051/matecconf/202031604005.

Full text

Abstract:

A time-frequency analytical method is presented to analyze physical mechanism of coaxial helicopter ground resonance. Eigenvalue calculation and numerical integration of disturbance equations of motions are used to obtain modal characters and time-domain response characters of coaxial helicopter ground resonance, and the interaction between rotors and body is revealed according to response of various DOFs. The analysis results show that regressive lag mode with upper rotor character is the most instability mode. In dynamic instability region, coaxial helicopter ground resonance is mainly due t

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!