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Journal articles on the topic 'Rotori'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 March 2023

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1

Mao, Xiaochen, and Bo Liu. "Numerical investigation of tip clearance size effect on the performance and tip leakage flow in a dual-stage counter-rotating axial compressor." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 231, no. 3 (2017): 474–84. http://dx.doi.org/10.1177/0954410016638878.

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Based on a validation of the numerical methods with an experiment, numerical simulations are carried out to study the effect of tip clearance size on the performance and tip leakage flow in a dual-stage counter-rotating axial compressor. The predicted results showed that the variation of the tip clearance size in rotor2 has a more significant impact on the overall performance and stall margin of the compressor. In addition, the impact of the tip clearance size effect is mainly on the rotor with the tip clearance size variation. The variation of the tip clearance size in rotor2 almost has no in

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2

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.

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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

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3

Laube, Tomasz, and Janusz Piechna. "Analytical and Numerical Feasibility Analysis of a Contra-Rotary Ramjet Engine." Energies 13, no. 1 (2019): 163. http://dx.doi.org/10.3390/en13010163.

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A new idea for a contra-rotary ramjet engine is presented. To define the theoretical limits of the non-typical, contra-rotary ramjet engine configuration, its analytical model was developed. The results obtained from that model and the analytical results were compared with those received from numerical simulations. The main weakness of existing rotary ramjet engine projects is the very high rotational speed of the rotor required for achieving supersonic inlet flow. In this paper, a new idea for a contra-rotary ramjet engine (CORRE) is presented and analyzed. This paper presents the results of

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4

Liu, Yongmeng, Yingjie Mei, Chuanzhi Sun, et al. "Multistage Asymmetric Rotors Coaxial Measurement Stacking Method Based on Minimization of Exciting Force." Symmetry 13, no. 6 (2021): 1054. http://dx.doi.org/10.3390/sym13061054.

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The unbalanced exciting force of high-speed rotary asymmetric rotor equipment is the main factor causing rotor vibration. In order to effectively suppress the vibration of the asymmetric rotor equipment, the paper establishes a multistage asymmetric rotor coaxial measurement stacking method that minimizes the exciting force. By analyzing the propagation process of the centroid of the multistage asymmetric rotor assembly and analyzing the relationship between the geometric center and the centroid of a single asymmetric rotor, a multistage asymmetric unbalanced rotor propagation model based on g

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5

Calgaro, Marcelo, Adroaldo Dias Robaina, and Márcia Xavier Peiter. "CURVAS DE DESEMPENHO OPERACIONAL DE BOMBAS CENTRÍFUGAS DETERMINADAS A PARTIR DAS CARACTERÍSTICAS FÍSICAS DO ROTOR I - VALORES NOMINAIS." IRRIGA 9, no. 1 (2004): 19–30. http://dx.doi.org/10.15809/irriga.2004v9n1p19-30.

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CURVAS DE DESEMPENHO OPERACIONAL DE BOMBAS CENTRÍFUGAS DETERMINADAS A PARTIR DAS CARACTERÍSTICAS FÍSICAS DO ROTORI - VALORES NOMINAIS Marcelo Calgaro1; Adroaldo Dias Robaina1; Márcia Xavier Peiter21Departamento de Engenharia Rural, Universidade Federal de Santa Maria, Santa Maria, RS, calgaro@mail.ufsm.br2Curso de Engenharia Agrícola, Universidade Regional Integrada do Alto Uruguai e das Missões – URI, Santiago, RS. 1 RESUMO Este trabalho teve como objetivo desenvolver uma metodologia com a finalidade de determinar os valores nominais da vazão, altura manométrica, rendimento, potência requerid

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6

Wang, Guangding, Xiaole Wang, Chuanliu Xie, and Huiqun Yuan. "Whirl dynamics of an axially functionally graded liquid-filled rotor considering shear deformation and rotary inertia." AIP Advances 12, no. 6 (2022): 065303. http://dx.doi.org/10.1063/5.0094880.

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In this study, whirl characteristics and stability of an axially functionally graded (AFG) liquid-filled rotor are investigated. The rotor is modeled based on the spinning Timoshenko beam theory. The governing equations for flexural vibration are derived via Hamilton’s principle. For pinned–pinned AFG liquid-filled rotor, the analytical solutions are derived for both the exact whirl frequency equation and the stability model. To validate the present formulations, comparative studies by numerical solutions available in the literature are conducted. Some numerical examples are performed to inves

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7

Mimmi, G., and P. Pennacchi. "Analytical model of a particular type of positive displacement blower." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 213, no. 5 (1999): 517–26. http://dx.doi.org/10.1243/0954406991522743.

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Many papers exist in the literature that deal with the twin-screw compressor. This usually has two different rotors, a male and a female, and is commonly used to produce compressed gas for industrial uses. However, a different type of positive displacement rotary compressor with two screws is sometimes used, one of its typical applications being in car engine supercharging. The present paper deals with the latter type, which is defined as a two-screw blower. This blower has two identical helical rotors, each with three lobes. The kinematics and the geometry of the rotors are analysed here, and

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8

Lee, A.-C., and Y.-P. Shih. "Identification of the Unbalance Distribution and Dynamic Characteristics of Bearings in Flexible Rotors." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 210, no. 5 (1996): 409–32. http://dx.doi.org/10.1243/pime_proc_1996_210_216_02.

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This paper presents a new method for estimating dynamic characteristics of bearings and unbalance distribution in flexible rotors based on the transfer matrix method for analysing the steady state responses of rotor-bearing systems, in which rotary inertia, gyroscopic and transverse-shear effects are also considered. Identification can be realized from the measured response data influenced by bearing characteristics and rotor unbalance using the least-squares method. Justification of the method is presented by numerical simulations.

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9

Kondratyuk, Dmitry, and Vitaliy Komaha. "DETERMINATION OF THE MAIN PARAMETERS OF THE ROTARY MOWER CUTTING APPARATUS." ENGINEERING, ENERGY, TRANSPORT AIC, no. 3(110) (October 30, 2020): 77–85. http://dx.doi.org/10.37128/2520-6168-2020-3-8.

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For mowing grass during harvesting of hay or haylage, support-free mowers with rotary movement of knives are used mainly, the productivity of which is much greater than segment-finger mowers. Free-cutting cutting apparatuses with rotational movement of knives happen with their rotation around the vertical (rotary) and horizontal (rotary) axes. Mowers that are equipped with rotary cutting devices significantly grind grass, so they are used in mower-grinders and lawn mowers. The purpose of the work is to substantiate the methodology for calculating the structural and kinematic parameters of rota

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10

Liu, Yongmeng, Ruirui Li, Chuanzhi Sun, et al. "Research on Rotary Parts Vibration Suppression Based on Coaxiality Measurement and Unbalance Constraint." Applied Sciences 11, no. 12 (2021): 5747. http://dx.doi.org/10.3390/app11125747.

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To suppress the vibration of rotary parts, this paper established an unbalanced vibration response control model of rotary parts based on rotating axis coordinate system. This model considered the stacking transformation of geometric parameter errors and mass parameter errors of single stage rotor. First of all, the centroid transfer model based on the actual rotation axis was established, and the unbalanced excitation force vector of each stage of the rotor was studied. Secondly, the unbalanced excitation force vector of each stage of the rotor is substituted into the model of assembly vibrat

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11

Lu, Y., K. Hoang, D. Noake, and N. Low. "Design and analysis of conical rotary compressor." IOP Conference Series: Materials Science and Engineering 1267, no. 1 (2022): 012001. http://dx.doi.org/10.1088/1757-899x/1267/1/012001.

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Conical Rotary Compressor (CRC) is a screw type Positive Displacement Machine (PDM) consisting of one inner rotor rotating inside an outer rotor. The conical internal meshing rotors with the feature of variable pitch and rotor profile have an inherent capability to operation at high pressure ratio due to high built-in volume ratio and low leakage. CRC has potential to run in various applications such as Heating, Ventilation, and Air Conditioning (HVAC) system, vacuum pumps, and air compressors. The performance of the machine is heavily affected by rotor profile and rotor geometry. In this pape

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Mimmi, G., and P. Pennacchi. "INTERNAL LOBE PUMP DESIGN." Transactions of the Canadian Society for Mechanical Engineering 21, no. 2 (1997): 109–21. http://dx.doi.org/10.1139/tcsme-1997-0008.

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The subject of this paper is the theoretical analysis of the internal lobe pump which is a particular type of positive displacement rotary pump. The main components of the pump are the rotors: usually the outer one is characterised by lobes with circular shape, while the inner rotor profile is determined as conjugate to the other. For this reason the first topic presented here is the definition of the geometry of the rotors starting from the design parameters. The choice of these parameters is subject to some limitations in order to avoid inner rotor undercutting and to limit the pressure angl

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13

Mao, Xiaochen, and Bo Liu. "A numerical study on the unsteady effect of axial spacing on the performance in a contra-rotating axial compressor." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 14 (2016): 2598–609. http://dx.doi.org/10.1177/0954406216638881.

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Unsteady numerical simulations are conducted to investigate the unsteady effects of axial spacing on the performance of a contra-rotating axial compressor. The results show that the stage efficiency is dominant by unsteady effects between two rotors at lower axial gap ranges. As the axial spacing is increased, the variation of aerodynamic force is different for the two rotors. As a whole, the oscillation on the pressure surface is much stronger than that on the suction side in rotor1. For rotor2, however, the local maximum amplitude is just located at the blade leading edge, especially near th

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14

Goo, Nam Seo, Hoon Cheol Park, and Kwang Joon Yoon. "Conceptual Design, Thrust Test, and Finite Element Analysis of a Tip-Jet Rotor Using a Small Turbo-Jet Engine." Key Engineering Materials 306-308 (March 2006): 541–46. http://dx.doi.org/10.4028/www.scientific.net/kem.306-308.541.

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A general helicopter uses rotary power produced from the installed engine in order to get the directional thrust. In the case of a tip-jet rotor helicopter, the compressed air or the combustion gas passes through a duct system inside rotors and is ejected out of the nozzle at the blade tips to produce torque enough for rotation of the rotor system. The generated torque makes the rotor system rotate, so that it can create the directional thrust. Since the anti-torque does not occur in this tip-jet rotorcraft, the tail rotor can be removed, which can be very attractive. In this paper, a power sy

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15

Kosushkin, K. G., B. S. Kritsky, and R. M. Mirgazov. "Computational studies of the rotors aerodynamic characteristics of multirotor drones." Civil Aviation High Technologies 24, no. 5 (2021): 60–75. http://dx.doi.org/10.26467/2079-0619-2021-24-5-60-75.

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The article presents the results of computational studies of aerodynamic characteristics for unmanned lift-generating multi-rotor drones of various configurations. The distinctive features of rotors flow were characterized. The rotor interaction was evaluated. The computations were based on the nonlinear rotor blade vortex theory in a non-stationary arrangement. The combinations of four, eight (four coaxial) and fourteen two-bladed rotors at velocity V = 100, 150, 200 km/h were considered. Semi-empirical methods were employed to select the rotor angles of attack, rotation speed, blade installa

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16

Bonandrini, G., G. Mimmi, and C. Rottenbacher. "Theoretical analysis of internal epitrochoidal and hypotrochoidal machines." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 223, no. 6 (2009): 1469–80. http://dx.doi.org/10.1243/09544062jmes1163.

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In this article, a complete and original method to analyse both the epitrochoidal and the hypotrochoidal rotary machines is presented. The internal trochoidal machines consist of two rotors: the first rotor is an envelope of a trochoid, the second rotor is its conjugate. In particular, in this article, the profiles of the trochoidal rotor and its conjugate are expressed by original and particularly synthetic equations using a method based on the theory of gearing. Then the geometry of these machines is completely defined by the choice of four non-dimensional parameters. Once these parameters a

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17

P.S., Ramesh, and Jeyan J. V. Muruga Lal. "HOVER PERFORMANCE ANALYSIS OF COAXIAL MINI UNMANNED AERIAL VEHICLE FOR APPLICATIONS IN MOUNTAIN TERRAIN." Aviation 26, no. 2 (2022): 112–23. http://dx.doi.org/10.3846/aviation.2022.16901.

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Due to its compactness, agility, good hover performance, and ease of carriage, coaxial rotor Mini UAV is apt for various military and civilian applications in mountain terrain. This paper examines various factors to arrive at viable configurations of coaxial rotor Mini UAV for applications in mountain terrain. A consideration of the coaxial rotor Mini UAV to analyse the suitability for mountain terrain is presented. Coaxial rotor design is evaluated to assess the design requirements of mountain terrain. Various design parameters are analysed to arrive at viable design configurations for coaxia

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18

Doerffer, Krzysztof, Janusz Telega, Piotr Doerffer, Paulina Hercel, and Andrzej Tomporowski. "Dependence of Power Characteristics on Savonius Rotor Segmentation." Energies 14, no. 10 (2021): 2912. http://dx.doi.org/10.3390/en14102912.

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Savonius rotors are large and heavy because they use drag force for propulsion. This leads to a larger investment in comparison to horizontal axis wind turbine (HAWT) rotors using lift forces. A simple construction of the Savonius rotor is preferred to reduce the production effort. Therefore, it is proposed here to use single-segment rotors of high elongation. Nevertheless, this rotor type must be compared with a multi-segment rotor to prove that the simplification does not deteriorate the effectiveness. The number of segments affects the aerodynamic performance of the rotor, however, the resu

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19

Povarov, Sergii. "Determination of the aerodynamic characteristics of the tiltrotor with the wingtip-mounted coaxial rotors." MECHANICS OF GYROSCOPIC SYSTEMS, no. 40 (December 26, 2021): 108–16. http://dx.doi.org/10.20535/0203-3771402020248778.

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The article describes the study of rotor-to-wing aerodynamic interaction for the wingtip-mounted coaxial rotors configuration of the tiltrotor aircraft. The influence of the rotor slipstreams on lift-to-drag ratio characteristic was determined. Obtained results were compared with similar characteristics of the equivalent in thrust conventional single rotor slipstreams impact. Using the computational aerodynamics methods (panel-vortex method) the flow around the tiltrotor model with the wingtip-mounted single and coaxial rotors has been simulated. A study of the basic model configur

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Povarov, Sergey. "Comparison of aerodynamic characteristics of convertible models with single and coaxial schemes of propellers." MECHANICS OF GYROSCOPIC SYSTEMS, no. 39 (May 20, 2020): 96–105. http://dx.doi.org/10.20535/0203-3771392020229110.

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The article describes the study of rotor-to-wing aerodynamic interaction for the wingtip-mounted coaxial rotors configuration of the tiltrotor aircraft. The influence of the rotor slipstreams on lift-to-drag ratio characteristic was determined. Obtained results were compared with similar characteristics of the equivalent in thrust conventional single rotor slipstreams impact. Using the computational aerodynamics methods (panel-vortex method) the flow around the tiltrotor model with the wingtip-mounted single and coaxial rotors has been simulated. A study of the basic model configur

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21

Kim, Pan Soo, and James L. White. "Flow Visualization of Intermeshing and Separated Counter-Rotating Rotor Internal Mixer." Rubber Chemistry and Technology 67, no. 5 (1994): 880–91. http://dx.doi.org/10.5254/1.3538719.

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Abstract A flow visualization investigation of material motions and compounding in an internal mixer with intermeshing rotors is described. Rotors based on the design of R. T. Cooke of Francis Shaw and Company are used. Compared with separated rotor designs developed by F. H. Banbury, the distinctive feature is the passage of the rubber and compounding ingredients through the calendering gap between the rotors during mixing. The intermeshing rotors were found to rapidly circulate the materials from rotor to rotor around the mixing chamber and to more rapidly incorporate carbon black and oil re

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22

Mimmi, Giovanni, and Paolo Pennacchi. "Compression Load Dynamics in a Special Helical Blower: A Modeling Improvement." Journal of Mechanical Design 123, no. 3 (1999): 402–7. http://dx.doi.org/10.1115/1.1377016.

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The instantaneous variation of pressure loads acting on the rotors of positive displacement rotary blowers may produce vibrations and noise that in some case produce the failure of the machine and of the piping. In a previous paper the authors determined the pressure loads acting on the rotors, starting from the geometry of the chambers that are formed during the rotor meshing and the thermodynamic transformation of the working fluid. The calculation of the loads has been made in a quasi-static manner. In this paper the model has been improved by taking into account the effects due to a closed

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23

Wang, Nanfei, Dongxiang Jiang, and Hongzhi Xu. "Dynamic characteristics analysis of a dual-rotor system with inter-shaft bearing." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 233, no. 3 (2017): 1147–58. http://dx.doi.org/10.1177/0954410017748969.

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The dual-rotor structure is susceptible to vibration, causing the malfunction of the entire operating system. In order to avoid the resonance during operation, it is significant and necessary to conduct modal analysis of such rotors. The dynamic analysis of the full dual-rotor system under operating conditions is also necessary to study dynamic characteristics of the rotating system. In this paper, one-dimension Timoshenko beam-type model, including the effects of gyroscopic moments, rotary inertias, bending and shear deformations, and three-dimension model for dual-rotor system with inter-sha

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24

McKay, Michael E., Robert Niemiec, and Farhan Gandhi. "Performance Comparison of Quadcopters with Variable-RPM and Variable-Pitch Rotors." Journal of the American Helicopter Society 64, no. 4 (2019): 1–14. http://dx.doi.org/10.4050/jahs.64.042006.

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Use of variable-pitch rotors was compared against variable-RPM rotors on a 2-kg (20 N) quadcopter in simulation. To generate 5 N of thrust in hover while maintaining a 2:1 maximum thrust-to-weight ratio, the variable-pitch rotor required 29% more power. At low climb rates the variable-RPM rotor requires less power, but near its maximum rate it required more power than the variable-pitch rotor. The maximum climb rate for the variable-pitch rotor was up to 70% greater than that of the variable-RPM rotor. A quadcopter equipped with variable-pitch rotors required more power to operate compared to

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25

Sineglazov, Victor, and Oleksandr Stanislavchuk. "Automation Disign of Hybrid Vertical-axial Rotors." Electronics and Control Systems 4, no. 70 (2022): 44–50. http://dx.doi.org/10.18372/1990-5548.70.16755.

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The paper proves the need to create vertical-axial rotors of wind power plants in the city strip, which can be placed on roofs, which makes it possible to increase their energy efficiency by 60-70%. It is shown that the placement of such rotors on the roofs has its own characteristics, which is the need to take into account the relief of the roof of the house, its surface area, rose and wind speed over it and others. Examples of wind farms are considered and it is proved that their energy efficiency can be increased by using hybrid vertical-axial rotors, which consist of a combination of Darri

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26

Tanabe, Yasutada, Hideaki Sugawara, Shigeru Sunada, Koichi Yonezawa, and Hiroshi Tokutake. "Quadrotor Drone Hovering in Ground Effect." Journal of Robotics and Mechatronics 33, no. 2 (2021): 339–47. http://dx.doi.org/10.20965/jrm.2021.p0339.

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A variable-pitch-controlled quadrotor drone was simulated in the ground effect using a high-fidelity CFD solver. In contrast to a single rotor in the ground effect, which has been extensively studied for conventional helicopters, the flow fields around multiple rotors are complex. In this study, the rotating speed of the rotors was maintained constant, and the blade pitch angles were adjusted so that the total thrust of the multicopter was the same regardless of the rotor height from the ground. It was observed that the power required for the quadrotors, which generate the same thrust, decreas

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27

Shen, ZhiHuang, Bin Yao, BinQiang Chen, Wei Feng, and XiangLei Zhang. "A Novel Rotor Profile Error Tracing and Compensation Strategy for High Precision Machining of Screw Rotor Based on Trial Cutting of Limited Samples." Shock and Vibration 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/978325.

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The machining precision plays an important role in the operation reliability and service life of screw rotors. However, the actual machined rotor profile of screw rotors is different from its theoretical profile due to the errors of the machine tool. This paper proposes a novel method of error tracing and compensation to reduce the machined errors of rotor profile on the basis of the limited sample trials, and the method is based on a matrix of error compensation. The errors of rotor profile are obtained based on limited sample trials machining of screw rotors,and fitted into piecewise smooth

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28

Lin, Jau-Wen, and M. D. Bryant. "Reductions in Wear Rate of Carbon Samples Sliding Against Wavy Copper Surfaces." Journal of Tribology 118, no. 1 (1996): 116–24. http://dx.doi.org/10.1115/1.2837065.

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Wear rates (μgm/s) versus rotor speed for carbon samples sliding against smooth and wavy copper rotors (250 μm thick copper sheets were attached to smooth and wavy steel and polycarbonate backings) were identical at some speeds, but at other speeds wear rates for the wavy rotors were almost half those of the smooth rotors. Slider vibrations (periodic, with period set by rotation) perpendicular to the sliding surface were measured and Fourier analyzed. Comparison of vibration spectral amplitudes to spectral amplitudes derived from surface profiles identified vibration modes dynamically enhanced

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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.

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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

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Buranarote, Jirarote, Yutaka Hara, Masaru Furukawa, and Yoshifumi Jodai. "Method to Predict Outputs of Two-Dimensional VAWT Rotors by Using Wake Model Mimicking the CFD-Created Flow Field." Energies 15, no. 14 (2022): 5200. http://dx.doi.org/10.3390/en15145200.

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Recently, wind farms consisting of clusters of closely spaced vertical-axis wind turbines (VAWTs) have attracted the interest of many people. In this study, a method using a wake model to predict the flow field and the output power of each rotor in a VAWT cluster is proposed. The method uses the information obtained by the preliminary computational fluid dynamics (CFD) targeting an isolated single two-dimensional (2D) VAWT rotor and a few layouts of the paired 2D rotors. In the method, the resultant rotor and flow conditions are determined so as to satisfy the momentum balance in the main wind

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Otsuka, Hikaru, Daisuke Sasaki, and Keiji Nagatani. "Reduction of the head-up pitching moment of small quad-rotor unmanned aerial vehicles in uniform flow." International Journal of Micro Air Vehicles 10, no. 1 (2017): 85–105. http://dx.doi.org/10.1177/1756829317745318.

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Multi-rotor unmanned aerial vehicles are unstable in headwind because of nose-up pitching moment generation and thrust degradation. Reducing the pitching moment generation could enhance the tolerance of the unmanned aerial vehicles to wind and improve cruise flight speed. In this study, a canted rotor configuration was proposed to reduce the moment in uniform flow and examined. The objective of the study is to evaluate the effect of moment reduction by canted rotors. First, flow interactions between rotors of the quad-rotor were visualized using a smoke wire method. Second, the moment reductio

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Mohammad, Al-Zgoul, and Attila Szilágyi. "Dynamical Simulation of A CNC Turning Centre (Survey Paper)." Design of Machines and Structures 10, no. 2 (2020): 85–90. http://dx.doi.org/10.32972/dms.2020.018.

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This paper shows the most common rotor systems which can be used to analyse a CNC turning center. Starting with the simplest rotor system representation (single-degree-offreedom) up to analysing multi-degree-of-freedom and infinite-degree-of-freedom rotor systems using the TMM (Transfer Matrix Method) when it comes to cases like multi desk rotors and Jeffcott-rotors.

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Prasad Rao, Jubilee, Jonathan E. Holzsager, Marco M. Maia, and Javier F. Diez. "Experimental Study into Optimal Configuration and Operation of Two-Four Rotor Coaxial Systems for eVTOL Vehicles." Aerospace 9, no. 8 (2022): 452. http://dx.doi.org/10.3390/aerospace9080452.

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Coaxial rotors are utilized in multirotor aerial vehicles for the added thrust compared to independent rotors while keeping similar area footprints; however, performance losses should be considered. This experimental study analyzes the effects of varying motor duty cycle and propeller pitch values in motor-propeller systems with two to four coaxial rotors. The results demonstrate that in a two-rotor coaxial system, to lessen the adverse effects of a front rotor’s backwash and operate at the maximum performance, only the back motor should be operated initially up to 75% duty cycle before using

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Kim, Pan Soo, and James L. White. "Simulation of Flow in an Intermeshing Internal Mixer and Comparison of Rotor Designs." Rubber Chemistry and Technology 69, no. 4 (1996): 686–95. http://dx.doi.org/10.5254/1.3538395.

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Abstract This paper describes a simulation of flow in various intermeshing rotor internal mixer designs. The rotor designs studied were obtained from the patent literature and presentations of the major intermeshing rotor machinery mixer manufactures. The results of the simulation are compared to those for rotors of commercial separated rotor mixers. We seek to compare intermeshing and separated rotor mixers by contrasting estimated rates of mixing per unit total mixing chamber volume. Intermeshing rotors are generally predicted to perform better. This indicates they will mix more material des

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Wang, Chuan Sheng, De Wei Zhang, and Hui Guang Bian. "Effects of Different Structure Rotors on Mixing Process and Quality of Short Fiber-Rubber Composite Material." Advanced Materials Research 87-88 (December 2009): 277–81. http://dx.doi.org/10.4028/www.scientific.net/amr.87-88.277.

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The structure of rotors is an important factor, which impacts the quality of the mixed rubber. For the short fiber-rubber composite material, the structure of the rotors is most important. Through the experiments study, the mixing performances of four-wing synchronous rotor, six-wing synchronous rotor and new type of six-wing synchronous varying clearance rotor have been studied. The experimental results indicated that the mixing performance of the new type rotor is much better than the four-wing and six-wing synchronous rotor for the mixing of short fiber-rubber composite materials.

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Pacholczyk, Michał, and Dariusz Karkosiński. "Parametric Study on a Performance of a Small Counter-Rotating Wind Turbine." Energies 13, no. 15 (2020): 3880. http://dx.doi.org/10.3390/en13153880.

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A small Counter-Rotating Wind Turbine (CRWT) has been proposed and its performance has been investigated numerically. Results of a parametric study have been presented in this paper. As parameters, the axial distance between rotors and a tip speed ratio of each rotor have been selected. Performance parameters have been compared with reference to a Single Rotor Wind Turbine (SRWT). Simulations were carried out with Computational Fluids Dynamics (CFD) solver and a Large Eddy Scale approach to model turbulences. An Actuator Line Model has been chosen to represent rotors in the computational domai

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Lee, Yu-Been, and Jae-Sang Park. "Hover Performance Analyses of Coaxial Co-Rotating Rotors for eVTOL Aircraft." Aerospace 9, no. 3 (2022): 152. http://dx.doi.org/10.3390/aerospace9030152.

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Hover performance analyses of coaxial co-rotating rotors (or stacked rotors), which can be used as lifting rotors for electric VTOL (eVTOL) aircraft, are conducted here. In this study, the rotorcraft comprehensive analysis code, CAMRAD II, is used with the general free-wake model. The generic coaxial co-rotating rotor without the blade taper and built-in twist is considered as the baseline rotor model, and the rotor is trimmed to match a prescribed rotor thrust value. The hover performance, including the rotor power and Figure of Merit (FM), is investigated for various index angles, axial spac

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Prášil, Tomáš, Ladislav Socha, Karel Gryc, et al. "Impact of Rotor Design on Its Wear and Work Efficiency of the Aluminum Refining Process." Metals 12, no. 11 (2022): 1803. http://dx.doi.org/10.3390/met12111803.

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Both the wear and the geometry of the rotor determine the efficiency of the process of aluminum refining. The paper presents wear tests of two different rotors: I (pump type) and II (propeller type). The operation of both rotors in industrial conditions was compared and their service life was examined. It was found that rotor I is more durable than the tested rotor II, and at the same time it provides a good level of hydrogen removal throughout the operation period, i.e., 1112 refining cycles. Rotor wear after refining was calculated by 3D scanning. The study also investigated the impact of ro

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Lebedev, V. A., L. M. R. Al-Obaidi, and N. S. Koval. "The finishing and cleaning of long parts in screw rotors." Advanced Engineering Research 22, no. 1 (2022): 42–49. http://dx.doi.org/10.23947/2687-1653-2022-22-1-42-49.

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Introduction. To search for effective methods of finishing and stripping of long-length parts, it is advisable to create a rotary-screw process system of a pass-through type. Its main working element is a screw rotor, which is a combination of flat elements of various shapes and sizes, multidirectional with respect to the helical lines around the perimeter. The purpose of this study is to justify the intensity of the machining process in devices equipped with a screw rotor.Materials and Methods. Metal removal is accepted as the main parameter determining the intensity of the machining process

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Tucker, V. A. "Using a Collision Model to Design Safer Wind Turbine Rotors for Birds." Journal of Solar Energy Engineering 118, no. 4 (1996): 263–69. http://dx.doi.org/10.1115/1.2871791.

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A mathematical model for collisions between birds and propellor-type turbine rotors identifies the variables that can be manipulated to reduce the probability that birds will collide with the rotor. This study defines a safety index—the “clearance power density”—that allows rotors of different sizes and designs to be compared in terms of the amount of wind energy converted to electrical energy per bird collision. The collision model accounts for variations in wind speed during the year and shows that for model rotors with simple, one-dimensional blades, the safety index increases in proportion

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Krebs, Travis, Goetz Bramesfeld, and Julia Cole. "Transient Thrust Analysis of Rigid Rotors in Forward Flight." Aerospace 9, no. 1 (2022): 28. http://dx.doi.org/10.3390/aerospace9010028.

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The purpose of this study was to investigate and quantify the transient thrust response of two small rigid rotors in forward flight. This was accomplished using a distributed doublet-based potential flow method, which was validated against wind-tunnel experimentation and a transient CFD analysis. The investigation showed that for both rotors, advancing and retreating blade effects were predicted to contribute to transient thrust amplitudes of 5–30% of the mean rotor thrust. The thrust output amplitudes of individual rotors blades were observed to be 15–45% of the mean rotor thrust, indicating

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Park, J. S., and S. N. Jung. "Comprehensive multibody dynamics analysis for rotor aeromechanics predictions in descending flight." Aeronautical Journal 116, no. 1177 (2012): 229–49. http://dx.doi.org/10.1017/s0001924000006813.

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AbstractThis paper studies the rotor aeromechanics in descending flight using a nonlinear flexible multibody dynamic analysis code, DYMORE. A freewake model is included in DYMORE to improve the rotor wake modelling. The wind-tunnel test data of the Higher-harmonic Aeroacoustics Rotor Test (HART) II rotor, with and without higher harmonic pitch control (HHC), and the flight test data of the full-scale utility helicopter rotor in descent are used for the aeromechanics correlation at an advance ratio of 0·15. The blade-vortex interaction (BVI) airloads are reasonably predicted for both the HART I

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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.

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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

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He, Xing Zhu, Shu Nan Liu, Yan Li Chen, Chun Xue Wang, and Song Yang. "Research on Hover Characteristics of Ducted Fan with Coaxial Rotors." Applied Mechanics and Materials 427-429 (September 2013): 216–20. http://dx.doi.org/10.4028/www.scientific.net/amm.427-429.216.

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The method of handling respectively is used to refine the grid of ducted fan with coaxial rotors. Research the complex flow field of the ducted fan by numerical simulation to analyze its hover characteristics. The curve of the upper rotors lift, the lower rotors lift, the ducts lift with collective and the distance between rotors is got respectively. By comparing with the aerodynamic characteristics of ducted fan with a single rotor, results show that there is interference between the upper and lower rotors, the upper one interferes the lower one more heavily and interference is reduced with t

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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.

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Ball auto-balancing devices can to compensate changes of unbalance "on the move" only for rotors operating at supercritical speeds. For automatic balancing of such rotors, classified as flexible rotors, several auto-balancers located in different cross sections of the shaft are necessary. This makes it necessary to account bending fluctuations on studies of dynamics of the rotor with auto-balancers, that is especially important in the design of the real rotors. In view of the complexity of experimental studies of such rotors in the article the method of direct numerical simulation of the dynam

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Chen, Guang Zhong, Bing Zhang, Yue Yang, Jin Han, and Lin Jun Tong. "3D Visualization Automatic Modeling of Helical Rotors." Applied Mechanics and Materials 321-324 (June 2013): 1721–24. http://dx.doi.org/10.4028/www.scientific.net/amm.321-324.1721.

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Structure of Helical rotor is complicated.3D visualization automatic modeling of Helical Rotors with CAD could make the design of product more efficient. Scheme of 3D visualization automatic modeling of Helical Rotors is described in detail and Generation Principle of end surface curve of rotor and Scanning helix is analyzed deeply in the paper. With the further development of SolidWorks by Visual C#, 3D Visualization Automatic Modeling of Helical Rotors is accomplished .

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Wang, Chuan Sheng, Wei Shuai Lv, and Hui Guang Bian. "Finite-Element Comparative Analysis of Two Kinds of Meshing Rotor." Key Engineering Materials 501 (January 2012): 16–21. http://dx.doi.org/10.4028/www.scientific.net/kem.501.16.

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This paper mainly introduces two kinds of internal mixer rotor. The professional visco-elastic fluid software--Polyflow is used to obtain dynamic simulation analysis process of the two different types of meshing rotors. The transient flow field model’s simulation results of the two intermeshing rotors which have rotated for 180 seconds are used to analyze the performance of the two rotors. And these analyses can be theoretical references for optimal design of the rotor.

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Stalewski, Wienczyslaw, and Wieslaw Zalewski. "Performance improvement of helicopter rotors through blade redesigning." Aircraft Engineering and Aerospace Technology 91, no. 5 (2019): 747–55. http://dx.doi.org/10.1108/aeat-01-2018-0009.

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Purpose The purpose of this paper is to determine dependencies between a rotor-blade shape and a rotor performance as well as to search for optimal shapes of blades dedicated for helicopter main and tail rotors. Design/methodology/approach The research is conducted based on computational methodology, using the parametric-design approach. The developed parametric model takes into account several typical blade-shape parameters. The rotor aerodynamic characteristics are evaluated using the unsteady Reynolds-averaged Navier–Stokes solver. Flow effects caused by rotating blades are modelled based o

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Akinin, K. P., A. E. Antonov, V. G. Kireyev, and A. A. Filomenko. "RETURN-ROTARY MOTION CONTROL SYSTEM OF ROTOR OF BRUSHLESS MAGNETOELECTRIC MOTOR." Praci Institutu elektrodinamiki Nacionalanoi akademii nauk Ukraini 2020, no. 55 (2020): 58–66. http://dx.doi.org/10.15407/publishing2020.55.058.

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Liu, Hung-Cheng, Shih-Hsi Tong, and Daniel C. H. Yang. "Trapping-Free Rotors for High-Sealing Lobe Pumps." Journal of Mechanical Design 122, no. 4 (1999): 536–42. http://dx.doi.org/10.1115/1.1311611.

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In this paper a method for the design of new rotor profiles for high-sealing lobe pump is presented. The objective of this research is to improve the sealing property of lobe pumps by designing chamber profile conforming rotors. The deviation function method is adopted for the design. The resultant rotors are trapping-free and have C1 continuity. A design procedure for rotor generation is also developed. A sealing index is defined to evaluate the sealing property of lobe pumps. Our results show that it is possible to design many new rotor profiles that have better sealing property than convent

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