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Journal articles on the topic 'Rotors'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 June 2025

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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.

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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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2

Kay, Matthew W., Gregory P. Walcott, James D. Gladden, Sharon B. Melnick, and Jack M. Rogers. "Lifetimes of epicardial rotors in panoramic optical maps of fibrillating swine ventricles." American Journal of Physiology-Heart and Circulatory Physiology 291, no. 4 (October 2006): H1935—H1941. http://dx.doi.org/10.1152/ajpheart.00276.2006.

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During ventricular fibrillation (VF), electrical activation waves are fragmented, and the heart cannot contract in synchrony. It has been proposed that VF waves emanate from stable periodic sources (often called “mother rotors”). The objective of the present study was to determine if stable rotors are consistently present on the epicardial surface of hearts comparable in size to human hearts. Using new optical mapping technology, we imaged VF from nearly the entire ventricular surface of six isolated swine hearts. Using newly developed pattern analysis algorithms, we identified and tracked VF

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3

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 (August 17, 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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4

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

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

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5

Andrew, Philip L. "GE Power Services Ships First F-class Extended-Life Rotors." Mechanical Engineering 138, no. 05 (May 1, 2016): 54–55. http://dx.doi.org/10.1115/1.2016-may-4.

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This article presents an overview of technical aspects of the first F-class gas turbine life-extended rotors. Power Services, a GE Power Business, has shipped from the Greenville, S.C., facility its two F-class extended-life rotors, building upon a foundation of experience gained by executing more than 20 E-class rotor life extensions (RLEs). Experience has shown that additional features that require inspection, including rabbet fillets on wheels other than on stage one, cannot be inspected without a complete rotor disassembly. Each rotor is uniquely characterised by the combination of its par

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Laube, Tomasz, and Janusz Piechna. "Analytical and Numerical Feasibility Analysis of a Contra-Rotary Ramjet Engine." Energies 13, no. 1 (December 30, 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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7

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.

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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

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8

Kong, Yong-Boon, J. V. R. Prasad, Lakshmi N. Sankar, and Chengjian He. "Finite State Inflow Flow Model for Coaxial Rotor Configuration." Journal of the American Helicopter Society 65, no. 3 (July 1, 2020): 1–11. http://dx.doi.org/10.4050/jahs.65.032002.

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An analytical coaxial rotor inflow model has been developed from potential flow theory using the pressure potential superposition approach. The coaxial rotor pressure potential superposition inflow model (PPSIM) is formulated in statespace form with structure similar to the Peters–He model, except that additional off-diagonal blocks are included in the apparent mass (M-matrix) and influence coefficient matrices (L-matrix). These off-diagonal blocks take into account mutual interference effects present in a coaxial rotor system by relating the rotor's inflows due to other rotor's pressure loadi

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9

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 (May 1, 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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10

Qian, Kun Xi, Z. H. Xu, and H. Wang. "Effects of Rotational Inertia and Bearing Force on Stability of Permanent Maglev Rotator." Applied Mechanics and Materials 150 (January 2012): 50–56. http://dx.doi.org/10.4028/www.scientific.net/amm.150.50.

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The authors’ former works demonstrated that a passive magnetic (PM) rotator supported merely by PM bearings has a minimal speed, above which it can stabilize its equilibrium, under the function of a so-called Gyro-effect. It is unclear, however, by which factors is this minimal speed determined. This paper investigated the factors affecting the minimal stable speed of permanent maglev rotator, namely, the rotating inertia and PMB force. Two novel permanent maglev turbine models were designed: Model A---one stator and three rotors which have the same size but different rotational inertias; Mode

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11

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 (February 15, 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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12

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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14

Liu, Cong, Baiqing Li, Zhiqiang Wei, Zongwei Zhang, Zezhong Shan, and Yu Wang. "Effects of Wake Separation on Aerodynamic Interference Between Rotors in Urban Low-Altitude UAV Formation Flight." Aerospace 11, no. 11 (October 22, 2024): 865. http://dx.doi.org/10.3390/aerospace11110865.

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In recent years, unmanned aerial vehicle (UAV) formation flight has become an effective strategy for urban air mobility (UAM). However, close rotor separation during formation flight leads to complex aerodynamic interference between rotors, significantly affecting UAV flight performance and operational safety. This study systematically examines the effects of axial and lateral rotor separation on the rotor’s thrust performance through wind tunnel experiments. The tests simulate horizontal, vertical, and hovering states by generating relative airflow in the wind tunnel, focusing primarily on th

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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 (November 1, 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

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 (November 1, 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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17

Tucker, V. A. "Using a Collision Model to Design Safer Wind Turbine Rotors for Birds." Journal of Solar Energy Engineering 118, no. 4 (November 1, 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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18

Doerffer, Krzysztof, Janusz Telega, Piotr Doerffer, Paulina Hercel, and Andrzej Tomporowski. "Dependence of Power Characteristics on Savonius Rotor Segmentation." Energies 14, no. 10 (May 18, 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

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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20

Saini, Gaurav, and Ashoke De. "ON THE SELF-STARTING COMPARATIVE PERFORMANCE EVALUATION OF DARRIEUS AND HYBRID HYDROKINETIC ROTOR." International Journal of Energy for a Clean Environment 24, no. 5 (2023): 67–91. http://dx.doi.org/10.1615/interjenercleanenv.v24.i5.50.

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Darrieus rotor is a promising technology for hydrokinetic and wind energy harvesting applications. However, the Darrieus rotor suffers from the problem of poor starting performance. The present research highlights solutions to improve the poor starting performance of the Darrieus rotor by introducing the hybrid rotor. Further, a comparative performance evaluation of conventional vertical axis Darrieus and hybrid rotors has been investigated numerically. The most widely used S-series S-1046 hydrofoil has been utilized by hybrid and Darrieus rotors. Further, two semicircular blades are used for

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21

Liu, Yongmeng, Yingjie Mei, Chuanzhi Sun, Pinghuan Xiao, Ruirui Li, Xiaoming Wang, and Chengtian Li. "Multistage Asymmetric Rotors Coaxial Measurement Stacking Method Based on Minimization of Exciting Force." Symmetry 13, no. 6 (June 11, 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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22

Sineglazov, Victor, and Oleksandr Stanislavchuk. "Automation Disign of Hybrid Vertical-axial Rotors." Electronics and Control Systems 4, no. 70 (April 1, 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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23

De Gregorio, F., P. Candeloro, G. Ceglia, and T. Pagliaroli. "Flow field and acoustic assessment of twin rotors in hover conditions." Journal of Physics: Conference Series 2802, no. 1 (July 1, 2024): 012011. http://dx.doi.org/10.1088/1742-6596/2802/1/012011.

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Abstract The paper presents part of the experimental activities in the GARTEUR Action Group RC/AG-26 framework to study the acoustic and aerodynamic characteristics of small rotors, including the influence of the rotor-rotor interactions. Two rotors with three-bladed propellers with a diameter D=393.7 mm were tested at a constant rotational speed of 5200 RPM, for different rotating verses and geometry configurations. Two rotor configurations were assessed in hover, i.e., either a baseline comprised of one isolated rotor, or two rotors arranged side-by-side. The aerodynamic loads, flow field ve

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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 (October 1, 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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Dayhoum, Abdallah, Mohamed Etewa, Alejandro Ramirez-Serrano, and Robert Martinuzzi. "Enhancing VTOL Performance: Shrouded Rotor BLDC Motor Model and Validation." Journal of Physics: Conference Series 2784, no. 1 (June 1, 2024): 012004. http://dx.doi.org/10.1088/1742-6596/2784/1/012004.

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Abstract One prominent area of current research interest, driven by a multitude of factors and considerations, centers around drone technology. A primary challenge currently faced in the realm of small-scale Unmanned Aerial Vehicles (UAVs) is the increasing demand for increased power coupled with the constraint of limited flight duration provided by available battery technology. These vehicles fall into two overarching categories based on the presence or absence of shrouding around their rotor(s). Shrouded rotors play a pivotal role in augmenting aerodynamic performance by enhancing thrust whi

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26

Bensason, David, Andrea Sciacchitano, and Carlos Ferreira. "Experimental study of the impact of blade-tip mounted rotors on the X-Rotor vertical-axis wind turbine." Journal of Physics: Conference Series 2767, no. 7 (June 1, 2024): 072016. http://dx.doi.org/10.1088/1742-6596/2767/7/072016.

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Abstract The Horizon 2020 European Commission-funded project - X-ROTOR - proposes a radical rethink of the traditional vertical-axis wind turbine geometry. The X-Rotor vertical axis wind turbine relies on blade-tip mounted rotors, referred to as secondary rotors, for power generation and takeoff. This study examines the aerodynamic effects of secondary rotors on a scaled X-Rotor model’s loading in an open-jet wind tunnel. Particle image velocimetry measurements are taken at two cross-stream planes within the volume of rotation of a scaled turbine model at two phase-locked positions. The measur

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27

Gan, Wenbiao, Yunpeng Wang, Hongbo Wang, and Junjie Zhuang. "Aerodynamic Investigation on a Coaxial-Rotors Unmanned Aerial Vehicle of Bionic Chinese Parasol Seed." Biomimetics 9, no. 7 (July 2, 2024): 403. http://dx.doi.org/10.3390/biomimetics9070403.

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Aerodynamic investigation of a bionic coaxial-rotors unmanned aerial vehicle (UAV) is performed. According to Chinese parasol seed features and flight requirements, the bionic conceptual design of a coaxial-rotors UAV is described. A solution procedure for the numerical simulation method, based on a multi-reference frame (MRF) model, is expressed, and a verification study is presented using the typical case. The aerodynamic design is conducted for airfoil, blade, and coaxial-rotors interference. The aerodynamic performance of the coaxial rotors is investigated by numerical simulation analysis.

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28

Noor Al-Fauzan Syahputra, Muhammad, Subekti Subekti, and Nur Indah. "Effect of eccentric mass on rotor dynamics as a source of harvesting energy vibration." JTTM : Jurnal Terapan Teknik Mesin 5, no. 1 (April 30, 2024): 54–61. http://dx.doi.org/10.37373/jttm.v5i1.855.

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This research focuses on the potential for vibration energy from the use of eccentric masses in dynamic rotors to become an electrical energy source. Prior studies on eccentric mass in dynamic rotors were primarily concerned with examining the rotor's vibrational characteristics; however, little research was done on converting vibrational energy into electrical energy. The purpose of this study is to ascertain the maximum amount of electrical energy that can be produced by dynamic rotor vibrations using an eccentric mass. Utilizing an electromagnetic energy harvester, an experimental study is

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29

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 (June 2, 2023): 4493. http://dx.doi.org/10.3390/en16114493.

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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

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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 (January 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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31

Bian, Hui Guang, Cui Wen Fu, and De Wei Zhang. "Three Dimension Fluid Field of Mixer with Synchronous Rotors." Advanced Materials Research 87-88 (December 2009): 323–28. http://dx.doi.org/10.4028/www.scientific.net/amr.87-88.323.

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The flow field analyzed method about mixer flow in chamber has been introduced, Synchronous rotor three dimension flow field simulation rubber with the Finite Element Analysis is reported. The physical and three dimension Finite Element Method models for synchronous rotors flow field has been built for the first time. Isothermal flow field simulation with synchronous rotor has been made, the pressure field, velocity field and viscosity field had been obtained from numerical simulation. The results showed flow field’s change rule in a circle clearly, which are useful to improve mixer rotor’s st

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32

Gan, Ze Feng (Ted), Vitor Tumelero Valente, Kenneth S. Brentner, and Eric Greenwood. "Multirotor broadband noise modulation." Journal of the Acoustical Society of America 155, no. 3_Supplement (March 1, 2024): A111. http://dx.doi.org/10.1121/10.0026987.

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Rotor broadband noise spectra are typically analyzed over time scales on the order of one or more rotor periods. However, modulation of the broadband noise spectrum with the blade passage frequency (BPF) has been shown to be significant for noise levels and perception of wind turbines and helicopters. In contrast, time-varying broadband noise has not been extensively studied for aircraft with many rotors, such as unmanned aerial vehicles (UAVs) or advanced air mobility aircraft. In this work, significant broadband noise modulation was measured in flight and anechoic chamber tests of hexacopter

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Wang, Feng, Panpan Sun, and Haijun Zhao. "Modeling and Solution for Vibration of Classical SRM." Journal of Physics: Conference Series 3004, no. 1 (May 1, 2025): 012057. https://doi.org/10.1088/1742-6596/3004/1/012057.

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Abstract The operation of switched reluctance motors (SRM) with eccentric rotors introduces significant radial magnetic forces, leading to transverse vibrations and irregular airgap distributions, which complicates the radial magnetic resultant force. To address this complexity, a vibration equation for eccentric rotors is first established using the finite element method. Next, detailed analytical models for the radial magnetic resultant force are developed, considering both ideal and overlap current waveforms in stator windings. These models facilitate the analysis of transverse vibration co

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Elgamal, Mohamed, Karim Kriaa, and Mohamed Farouk. "Drainage of a Water Tank with Pipe Outlet Loaded by a Passive Rotor." Water 13, no. 13 (July 5, 2021): 1872. http://dx.doi.org/10.3390/w13131872.

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The optimal design of pipe outlets is an essential objective for many engineering projects. For the first time, this paper reports the results of a laboratory investigation on the effect of using a passive rotor (added at the pipe outlet) on the outlet performance. Different sizes and numbers of blades of rotors were considered. Through the Tracker software package, video and image processing techniques were applied to capture the temporal variations of the tank water depth and the passive rotor’s angular speed. In addition, a normalized average drainage rate (NADR) parameter is defined to qua

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Xu, Ziyi, Yi Ding, Zhe Hui, Chu Tang, Zhaobing Jiang, and Liang Wang. "Performance Analysis and Flow Mechanism of Close-Range Overlapping Rotor in Hover." Drones 9, no. 4 (April 1, 2025): 269. https://doi.org/10.3390/drones9040269.

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High payload capacity multi-rotor aerial vehicles are typically configured with multiple propellers to achieve the required aerodynamic lift. However, this design approach often results in an increased overall dimensional envelope, which introduces significant operational limitations in confined spatial environments such as urban airspace. By utilizing a limited overlap rotor configuration, the spatial utilization rate of an aircraft can be greatly improved, ensuring a sufficient thrust of rotor while simultaneously reducing the size of the aircraft. However, the slipstreams of two rotors over

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Ahmad Adib Najib, Djamal Hissein Didane, Mostafa Radwan Behery, and Hashim Ahmed Kabrein. "Comparison of 2D and 3D Simulations on Predicting the Performance of a Savonius Wind Turbine." CFD Letters 16, no. 7 (March 4, 2024): 71–88. http://dx.doi.org/10.37934/cfdl.17.6.7188.

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The performance of Savonius rotors plays a vital role in harnessing wind energy for various applications. This study aims to investigate and compare the performance characteristics of Savonius rotors using two-dimensional (2D) and three-dimensional (3D) analysis approaches. The primary objective is to determine the optimal analysis method for evaluating the rotor's performance. The simulations were conducted using ANSYS software, considering six different tip-speed ratios (TSRs) ranging from 0.2 to 1.2, and three wind speed categories (7 m/s, 5 m/s, and 3 m/s). The hybrid shear-stress transpor

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Dayhoum, Abdallah, Alejandro Ramirez-Serrano, and Robert J. Martinuzzi. "Design of an Experimental Test Rig for Shrouded and Open Rotors for Small Rotary Wing Unmanned Aerial System." Electronics 14, no. 8 (April 14, 2025): 1584. https://doi.org/10.3390/electronics14081584.

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This study details the design and testing of a custom test rig for evaluating the performance of both open and shrouded rotors. The rig includes a two-axis load cell that is directly connected to the rotor to measure the rotor thrust separated from the total thrust when testing shrouded rotors and ensure accurate torque measurements, independent of external structural influences. Moreover, a main load cell is used to measure the total thrust for both configurations (open and shrouded rotor), as it is connected to the entire setup. Rotor RPM is monitored by capturing the voltage frequency from

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Kaleta, Jiří, Josef Michl, Cécile Mézière, Sergey Simonov, Leokadiya Zorina, Pawel Wzietek, Antonio Rodríguez-Fortea, Enric Canadell, and Patrick Batail. "Gearing motion in cogwheel pairs of molecular rotors: weak-coupling limit." CrystEngComm 17, no. 41 (2015): 7829–34. http://dx.doi.org/10.1039/c5ce01372k.

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

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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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Morgan, Laurence, Abbas Kazemi Amiri, William Leithead, and James Carroll. "Effect of blade inclination angle for straight-bladed vertical-axis wind turbines." Wind Energy Science 10, no. 2 (February 4, 2025): 381–99. https://doi.org/10.5194/wes-10-381-2025.

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Abstract. Vertical-axis wind turbines (VAWTs) have received renewed research interest in the offshore environment due to a number of design synergies that have the potential to decrease the cost of energy for offshore wind. Many studies have been completed on the rotor design for straight-bladed rotors (H-rotors); however, there is sparse information on the effect of blade inclination angle on VAWT aerodynamic performance and the optimal blade design of VAWTs with inclined blades (V-rotors) for maximum power capture. This paper presents a systematic study into the effect of blade inclination a

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Peng, Jifeng. "Effects of Aerodynamic Interactions of Closely-Placed Vertical Axis Wind Turbine Pairs." Energies 11, no. 10 (October 21, 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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Mimmi, G., and P. Pennacchi. "INTERNAL LOBE PUMP DESIGN." Transactions of the Canadian Society for Mechanical Engineering 21, no. 2 (June 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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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 (April 20, 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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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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Tulwin, Tytus. "Low Reynolds Number Rotor Blade Aerodynamic Analysis." MATEC Web of Conferences 252 (2019): 04006. http://dx.doi.org/10.1051/matecconf/201925204006.

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Maintaining a steady hover flight in a rotorcraft usually requires high energy input. The aim of the paper is to prove that it is possible to vastly reduce energy use in a rotorcraft by reducing the disc loading. The energy consumption reduction is especially important in electric rotorcraft, where the energy source is characterized by low energy density when compared to the hydrocarbon fuel in ICE rotorcraft. The paper presents results of CFD simulations on low Reynolds Number operating rotors. For low RE rotors tip vortex induced drag is highly affecting the rotor’s Figure of Merit, thus red

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Wileman, J., and I. Green. "Parametric Investigation of the Steady-State Response of a Mechanical Seal With Two Flexibly Mounted Rotors." Journal of Tribology 121, no. 1 (January 1, 1999): 69–76. http://dx.doi.org/10.1115/1.2833813.

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A parametric analysis is performed to investigate the steady-state dynamic response of a mechanical seal with two flexibly mounted rotors. The effect of changing various inertia, support, and fluid film properties is examined. Short rotors are shown to benefit from gyroscopic aligning moments and to exhibit their maximum steady-state misalignment when one of the shaft speeds is zero. Long rotors experience misaligning gyroscopic moments, but if only one of the two rotors is long then aligning moments from the short rotor can be transmitted through the fluid and counteract the detrimental gyros

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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 (February 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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Song, Wenda, Zhengzhi Mu, Yufei Wang, Zhiyan Zhang, Shuang Zhang, Ze Wang, Bo Li, et al. "Comparative Investigation on Improved Aerodynamic and Acoustic Performance of Abnormal Rotors by Bionic Edge Design and Rational Material Selection." Polymers 14, no. 13 (June 23, 2022): 2552. http://dx.doi.org/10.3390/polym14132552.

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Rotor plays a vital role in the dynamical system of an unmanned aerial vehicle (UAV). Prominent aerodynamic and acoustic performance are a long-term pursuit for the rotor. Inspired by excellent quiet flight characteristics of owls, this work adopted bionic edge design and rational material selection strategy to improve aerodynamic and acoustic performance of the rotor. A reference model of rotor prototype with streamlined edges was firstly generated by reverse engineering method. With inspiration from owl wings and feathers, bionic rotors with rational design on leading and trailing edges were

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Kaltenbacher, Wenzel, Markus Rottmann, and Olaf Dössel. "An algorithm to automatically determine the cycle length coverage to identify rotational activity during atrial fibrillation – a simulation study." Current Directions in Biomedical Engineering 2, no. 1 (September 1, 2016): 167–70. http://dx.doi.org/10.1515/cdbme-2016-0038.

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AbstractAtrial fibrillation is the most common cardiac arrhythmia. Many physicians believe in the hypothesis that persistent atrial fibrillation is maintained by centers of rotatory activity. These so called rotors are sometimes found by physicians during catheter ablation or electrophysiological studies but there are also physicians who claim that they did not find any rotors at all. One reason might be that today rotors are mainly identified by visual inspection of the data. Thus we are aiming at an algorithm for rotor detection. We first developed an algorithm based on the local activation

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