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Journal articles on the topic 'Coaxial reducer'

Author: Grafiati

Published: 28 May 2022

Last updated: 30 July 2025

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1

Vintilă, Daniela, Laura Diana Grigorie, and Alina Elena Romanescu. "Dynamic Analysis of Planetary Gear Reducer." Applied Mechanics and Materials 880 (March 2018): 87–92. http://dx.doi.org/10.4028/www.scientific.net/amm.880.87.

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This paper presents dynamic analysis of a three stage planetary gear reducer for operate a tower crane. Ordinary and planetary gears have been designed respecting the coaxial, neighboring and mounting conditions. Harmonic analysis has been processed to identify frequency response for displacements, strains and deformations. The aim of the study was to determine critical frequencies to avoid mechanical resonance phenomenon. The obtained results are based on the superposition method for solving the systems of differential equations resulting from the analysis with finite elements.

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2

Buiga, Ovidiu, and Lucian Tudose. "Optimal mass minimization design of a two-stage coaxial helical speed reducer with Genetic Algorithms." Advances in Engineering Software 68 (February 2014): 25–32. http://dx.doi.org/10.1016/j.advengsoft.2013.11.002.

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3

Taricyn, Danil, Danil Orlov, and Aleksandr Petuhov. "Test results of a prototype transmission with non-contact gearing based on permanent magnets." Proceedings of Petersburg Transport University 21, no. 3 (2024): 706–17. http://dx.doi.org/10.20295/1815-588x-2024-03-706-717.

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Purpose: the paper studies the properties of a coaxial magnetic transmission with permanent magnets and magnetizing windings. The dependences of the efficiency on the rotation frequency and load power are revealed, as well as the dependence of the maximum torque preceding the engagement failure on the magnetizing current and the rotation frequency. Methods: experimental study on a stand by loading the drive motor through the test transmission on a generator loading on a resistor. The process of studying the stand is also described, including determining the losses in test electric machines by

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4

TERADA, Hidetsugu, Tomoaki FUKASAWA, and Rinzoh IRIE. "Fundamental Analysis of a Precession Motion Ball Reducer (1st Report)-Motion Principle of a Coaxial Output Type-." Journal of the Japan Society for Precision Engineering 69, no. 5 (2003): 688–92. http://dx.doi.org/10.2493/jjspe.69.688.

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5

Усік, В. В., та О. В. Косенко. "ДОСЛІДЖЕННЯ ПЕРЕДАТНИХ ВІДНОШЕНЬ ПЛАНЕТАРНИХ ПЕРЕДАЧ ПІДЙОМНО-ТРАНСПОРТНИХ МАШИН". Open Information and Computer Integrated Technologies, № 97 (8 грудня 2023): 158–63. http://dx.doi.org/10.32620/oikit.2023.97.10.

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Lifting and transporting machines (PTM) are one of the important equipment for the mechanization of work in various spheres of the national economy. In addition to the multi-rescue system, the cargo lifting mechanism also includes a winch. Winches with one drum, which have standard parameters - traction force from 3.2 to 125 KN at rope speed from 0.5 to 0.1 m/s, are most often used in PTM. Such winches include a two-stage gear reducer that connects the electric motor with the drum. Such a winch drive scheme is quite large and has considerable weight. One of the areas that will help reduce thes

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6

Gonza´lez-Palacios, M. A., and J. Angeles. "The Design of a Novel Mechanical Transmission for Speed Reduction." Journal of Mechanical Design 121, no. 4 (1999): 538–43. http://dx.doi.org/10.1115/1.2829495.

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The design of a novel transmission for speed reduction is reported in this paper. The transmission is based on the layout of pure-rolling indexing cam mechanisms, for it is intended to eliminate backlash and friction, which are the main drawbacks of gear transmissions. The design relies on a unified methodology for indexing cam mechanisms, whereby the same procedure is used to design planar, spherical, and spatial mechanisms. Two versions of the speed reducer, that we term Speed-o-Cam, are described here, namely, planar, to couple shafts of parallel axes, and spherical, to couple shafts of int

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7

Dansran, Bayarsaikhan, Songyuan Xu, Jiwon Heo, Chan-Soo Lee, and Bierng-Chearl Ahn. "Design of a Broadband Transition from a Coaxial Cable to a Reduced-Height Rectangular Waveguide." Applied Sciences 13, no. 20 (2023): 11265. http://dx.doi.org/10.3390/app132011265.

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For miniaturization, rectangular waveguides with a reduced height are often required, along with a coaxial transition for signal launching. We present a simulation-based design of a broadband transition from a coaxial cable to a rectangular waveguide with the height(b)-to-width(a) ratio b/a ranging from 0.125 to 0.375. The proposed transition consists of a coaxial probe with a cylindrical head or a disk and two symmetrically placed tuning posts. To extend the operating frequency range, three sections of the rectangular waveguide are employed with properly chosen dimensions. Design examples are

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Novikova, Galina V., Alexander A. Tikhonov, Mariana V. Prosviryakova, Vladimir F. Storchevoy, Olga V. Mikhaylova, and Alexander V. Storchevoy. "Justification of the Microwave Unit Parameters for Removing Fat from the Bones." Engineering Technologies and Systems 34, no. 2 (2024): 318–35. http://dx.doi.org/10.15507/2658-4123.034.202402.318-335.

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Introduction. The existing methods of removing fat from the bones of meat-producing animals are low-efficient and require high operating costs. To solve this problem, a unit with an ultra-high-frequency energy supply to the resonator is proposed. In this unit the crushed raw materials are subjected to thermomechanical action. Aim of the Study. The aim of the study is to increase the efficiency of removing fat from the bones of meat-producing animals while preserving the product feed value in a continuousflow process microwave unit with a coaxial resonator without a shielding housing by providi

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9

Usenko, Vjacheslav, Kateryna Balalaieva та Mykhailo Mitrakhovych. "Оцінка тяги закапотованого співвісного гвинтовентилятора". Aerospace technic and technology, № 4 (11 серпня 2022): 52–56. http://dx.doi.org/10.32620/aktt.2022.4.06.

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One of the basic requirements for existing and future aircraft engines is high specific power, low specific fuel consumption, and low noise level. The current work evaluates the thrust of a ducted coaxial propfan. A coaxial propfan was chosen as the object under study. The peripheral diameter of the first and second rows of the propfan reaches 4.5 m. The number of blades of the first row of the propfan is 8, the second – 6. The duct had a length of 3.214 m and a maximum profile thickness of 0.23 m. For this study, a model of a coaxial propeller fan was made for a numerical experiment. The mode

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10

Mya, Yin Yin. "Improvement of Pulse Shape by Reducing Ripple Using Coaxial Cable." Journal of Engineering Technology and Applied Physics 5, no. 2 (2023): 45–51. http://dx.doi.org/10.33093/jetap.2023.5.2.4.

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Even though pulse shape in rectangular form is desirable for most applications, pulse generated from coaxial cable has ripple and is not in desired rectangular shape. This study is to improve the pulse shape generated from coaxial cable to be rectangular shape. Coaxial cables with difference dielectric materials are studied for generation 100 ns pulse. The study has been carried out by state space representation method and MATLAB simulation for pulse forming network of Type-B which has same characteristics of coaxial cable. Ripple can be reduced to 2% to 3% increasing the inductance values nex

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11

Xu, Zheng, and James Jian-Qiang Lu. "Coaxial Through-Strata-Via (TSV) Analysis and Modeling." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2011, DPC (2011): 002112–34. http://dx.doi.org/10.4071/2011dpc-tha12.

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Through-strata-via (TSV) is well accepted as a critical component in 3D integration that would extend Moore's Law. Since its electromagnetic fields that carry the signal exist only between the inner conductor and outer shell, the coaxial TSV offers small coupling, reduced loss and high density to meet rigorous specifications. The published results also show that the signal integrity of coaxial TSVs is better than that of other TSV configurations, while lack of detailed analysis and modeling for TSV physical design guidelines. In comparison to other TSV configurations, there are some advantages

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12

Lee, Nara, Su-Hyeon Choi, Seyeon Won, et al. "Comparison of Surgical Outcomes of Two New Techniques Complementing Robotic Single-Site Myomectomy: Coaxial Robotic Single-Site Myomectomy vs. Hybrid Robotic Single-Site Myomectomy." Journal of Personalized Medicine 14, no. 4 (2024): 439. http://dx.doi.org/10.3390/jpm14040439.

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Background: This study aimed to compare surgical outcomes between two new robotic single-site myomectomy (RSSM)-complementary techniques: coaxial robotic single-site myomectomy (Coaxial-RSSM) and hybrid robotic single-site myomectomy (Hybrid-RSSM). Methods: Medical records for 132 women undergoing Coaxial-RSSM and 150 undergoing Hybrid-RSSM, consecutively, were retrospectively reviewed. Patient characteristics and surgical outcomes were assessed and compared after propensity score matching (PSM). Results: In the outcomes of PSM, the Coaxial-RSSM group showed significantly reduced blood loss (7

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13

Mateev, Valentin, Miglenna Todorova, and Iliana Marinova. "Design Aspects of Conical Coaxial Magnetic Gears." Energies 16, no. 10 (2023): 4191. http://dx.doi.org/10.3390/en16104191.

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In this paper, a new design of a conical coaxial magnetic gear was proposed. Conical magnetic gears are considered a logical link between the radial- and axial-field coaxial designs. The modeling of magnetic torques based on the 3D finite element method was developed. The design parameter variations of the conical coaxial magnetic gear were determined and discussed. The magnetic torque density was calculated and compared with that of a cylindrical coaxial magnetic gear with the same size and materials used. An optimal cone angle based on the air-gap length was proposed. Multistage conical coax

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14

Akanova, G., A. Sadkowski, S. Podbolotov, A. Kolga, and I. Stolpovskikh. "Ways to reduce hydraulic losses in multistage centrifugal pumping equipment for mining and oil-producing industries." Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, no. 6 (2021): 77–84. http://dx.doi.org/10.33271/nvngu/2021-6/077.

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Purpose. To study hydraulic losses in pumping units during pumping and transportation of liquids, to develop the design and technology solutions to improve the energy efficiency of centrifugal pumps in the mining and oil-producing industries. Methodology. In the theoretical and experimental analysis of hydraulic losses during the transportation of liquids, the hydraulics and experimental analysis methods were used. Findings. As a result of the research carried out, a new design scheme of a multistage centrifugal pump has been developed, providing a coaxial arrangement of impellers, which allow

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15

Ho, Min-Hua, Chung-I. G. Hsu, Jhuo-Ting Hung, and You-Lin Shen. "Miniaturized trisection BPF design using size-reduced substrate integrated coaxial resonators." International Journal of Applied Electromagnetics and Mechanics 68, no. 2 (2022): 263–73. http://dx.doi.org/10.3233/jae-210114.

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The contribution of this work is to propose miniaturized trisection bandpass filters (BPFs) using size-reduced substrate integrated coaxial resonators (SICRs). The applied SICRs are operated under a coaxial mode. The occupied circuit area of the SICR developed from its structurally similar one, the substrate integrated waveguide (SIW) cavity, is only 6.2% that of the latter, corresponding to a circuit-area reduction rate of 93.8%. The cross-coupling between the input and output resonators can be either a magnetic or electric coupling for locating the transmission zero near either the upper or

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16

Zhang, Peng, Xingjun Ge, Fangchao Dang, et al. "A compact S-band relativistic backward wave oscillator with a 2.5-period slow-wave structure." Physics of Plasmas 29, no. 12 (2022): 123106. http://dx.doi.org/10.1063/5.0127697.

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Compact is a significant research direction of low-frequency high-power microwave devices. In this paper, a compact S-band relativistic backward wave oscillator is presented. The radial dimension of the device is reduced by utilizing the characteristic that the cutoff frequency of the fundamental mode (quasi-TEM mode) of the coaxial Slow-Wave Structure (SWS) is zero. Moreover, a coaxial extraction structure is designed to enhance its resonance characteristics to reduce the number of slow-wave structures. In addition, a reflective structure with the phase difference between inner and outer cond

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17

Zhang, Rongguang, Xun Chen, Han Wang, et al. "Study on Deposition of Coaxial Electrospinning Fibers by Coaxial Auxiliary Flow Field." Polymers 17, no. 3 (2025): 396. https://doi.org/10.3390/polym17030396.

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Gas-assisted coaxial electrospinning (GACES) is a simple and general method for the mass preparation of coaxial nanofiber membranes, which has great industrial potential. However, in the manufacturing process, due to the bending instability of the jet in the electric field and the pulling effect of the gas flow field, the deposition uniformity of the fiber is still a big problem. Through finite element simulation analysis of the flow field in the manufacturing process and the construction of the jet mechanics model after adding the flow field, the influence mechanism of coaxial auxiliary flow

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18

Acikgoz, H., and İ. Turer. "A Novel Microwave Coaxial Slot Antenna for Liver Tumor Ablation." Advanced Electromagnetics 3, no. 1 (2014): 20. http://dx.doi.org/10.7716/aem.v3i1.192.

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This paper is on the effect of a T-ring shape structure to enhance the capability of a microwave coaxial slot antenna (MCA) in the treatment of liver cancer. The MCA is composed of an interstitial coaxial line that is enclosed in a catheter. The T-ring shape structure is wrapped on the outer conductor of the MCA. Thanks to the new structure, the backward heating problem appearing in many coaxial antennas is reduced and the generated heat in front of the slot is higher than those for a classical MCA.

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19

Savelkaev, Sergei V. "UNIVERSAL COAXIAL-STRIPLINE AND PROBE TEST FIXTURES AND THEIR CALIBRATION METHODS." Vestnik SSUGT (Siberian State University of Geosystems and Technologies) 25, no. 4 (2020): 229–37. http://dx.doi.org/10.33764/2411-1759-2020-25-4-229-237.

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The design and calibration method for a coaxial-stripline test fixture that provides connection of microwave circuit analyzer of both coaxial measures and microstrip calibrators, as well as the active components under study, such as transistors, are considered. The test fixture provides high repeatability of connecting coaxial measures, microstrip calibrators, and active components being studied and has a small standing-wave ratio and loss. The test fixture is calibrated with using a minimal set of easily calculated microstrip calibrators with low losses, which, taking into account the high re

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20

Guan, Nanxiang, Ao Wang, Yongpeng Gu, Zhifeng Xie, and Ming Zhou. "A Novel Coaxial Balance Mechanism for Reciprocating Piston Engines." Applied Sciences 11, no. 12 (2021): 5647. http://dx.doi.org/10.3390/app11125647.

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Vibration is an important issue faced by reciprocating piston engines, and is caused by reciprocating inertia forces of the piston set. To reduce the vibration without changing the main structure and size of the original engine, we proposed a novel coaxial balance mechanism design based on a compact unit body. By introducing a second-order balance mass, this mechanism can significantly increase the efficiency of vibration reduction. The proposed mechanism can effectively balance the first-order and second-order inertia forces with the potential of balancing high-order inertia forces. To accura

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21

Wang, Junjie, XinFeng Zhang, and Jiaxin Lu. "Aerodynamic Interaction Characteristics Study of the Ducted Coaxial Propeller for a Novel eVTOL in Hovering." International Journal of Aerospace Engineering 2023 (October 3, 2023): 1–15. http://dx.doi.org/10.1155/2023/8098307.

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The ducted coaxial propeller (DCP) is highly advantageous in the design of eVTOL aircraft due to its safety, compactness, and low noise levels. To study the aerodynamic characteristics of DCP in hovering, a novel eVTOL was used, and a slip grid model was established to solve the three-dimensional unsteady N-S equation. The aerodynamic characteristics of DCP were compared to those of the free coaxial propeller (FCP) and ducted single propeller (DSP) to reveal the interaction mechanism of unsteady flow between the duct and propellers. The results indicate that the duct significantly mitigates th

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22

Giljarhus, Knut Erik Teigen, Alessandro Porcarelli, and Jørgen Apeland. "Investigation of Rotor Efficiency with Varying Rotor Pitch Angle for a Coaxial Drone." Drones 6, no. 4 (2022): 91. http://dx.doi.org/10.3390/drones6040091.

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Coaxial rotor systems are appealing for multirotor drones, as they increase thrust without increasing the vehicle’s footprint. However, the thrust of a coaxial rotor system is reduced compared to having the rotors in line. It is of interest to increase the efficiency of coaxial systems, both to extend mission time and to enable new mission capabilities. While some parameters of a coaxial system have been explored, such as the rotor-to-rotor distance, the influence of rotor pitch is less understood. This work investigates how adjusting the pitch of the lower rotor relative to that of the upper

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23

Tang, Xianfeng, Yemin Zang, Xiangqiang Li, and Che Xu. "A Metamaterial Bandpass Filter with End-Fire Coaxial Coupling." Electronics 13, no. 16 (2024): 3158. http://dx.doi.org/10.3390/electronics13163158.

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A miniaturized metamaterial (MTM) bandpass filter (BPF) based on end-fire coaxial coupling is proposed. End-fire coaxial coupling is achieved by using the coaxial cavity to connect with the SubMiniature version A connector. The subwavelength characteristics of the MTM lead to the miniaturization advantages of the filter in transverse dimensions. Moreover, the longitudinal length of the coaxial cavity can be sharply reduced by introducing matched blocks. As a result, the proposed filter has miniaturization merit both in transverse and longitudinal dimensions. The full-wave simulation results fu

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SHIMOJIMA, Yoshifumi, Kohei OMURA, Yinggang BU, and Tsutomu MIZUNO. "Examination of Oscillation Frequency to Reduce Change in the Sensitivity of an Eddy-current Displacement Sensor due to Coaxial Cable Torsion." Journal of the Japan Society of Applied Electromagnetics and Mechanics 23, no. 3 (2015): 448–53. http://dx.doi.org/10.14243/jsaem.23.448.

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25

Rahmani-Manglano, Nor E., Emilia M. Guadix, Charlotte Jacobsen, and Pedro J. García-Moreno. "Comparative Study on the Oxidative Stability of Encapsulated Fish Oil by Monoaxial or Coaxial Electrospraying and Spray-Drying." Antioxidants 12, no. 2 (2023): 266. http://dx.doi.org/10.3390/antiox12020266.

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The impact of the encapsulation technology on the oxidative stability of fish-oil-loaded capsules was investigated. The capsules (ca. 13 wt% oil load) were produced via monoaxial or coaxial electrospraying and spray-drying using low molecular weight carbohydrates as encapsulating agents (e.g., glucose syrup or maltodextrin). The use of spray-drying technology resulted in larger capsules with higher encapsulation efficiency (EE > 84%), whilst the use of electrospraying produced encapsulates in the sub-micron scale with poorer retention properties (EE < 72%). The coaxially electrosprayed c

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26

Wang, Bo, Xin Yuan, Qi-jun Zhao, and Zheng Zhu. "Geometry Design of Coaxial Rigid Rotor in High-Speed Forward Flight." International Journal of Aerospace Engineering 2020 (December 4, 2020): 1–18. http://dx.doi.org/10.1155/2020/6650375.

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The aerodynamic performance analysis and blade planform design of a coaxial rigid rotor in forward flight were carried out utilizing CFD solver CLORNS. Firstly, the forward flow field characteristics of the coaxial rotor were analyzed. Shock-induced separation occurs at the advancing side blade tip and severe reverse flow occurs at the retreating side blade root. Then, the influence of geometrical parameters of the coaxial rigid rotor on forward performance was investigated. Results show that swept-back tip could reduce the advancing side compressibility drag and elliptic shape of blade planfo

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Budhwani, Karim I., Makena A. Dettmann, Mansoor N. Saleh, and Vinoy Thomas. "Nano and Microbubble Systems for On-Demand Cancer Drug Delivery." Current Nanoscience 14, no. 1 (2017): 33–41. http://dx.doi.org/10.2174/1573413713666171009160858.

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Background: Chemotherapy, the predominant cancer treatment modality, suffers from elimination in renal and hepatic systems causing reduced bioavailability and increased toxicity leading to harmful side effects. Targeted release of formulations encapsulated in protective biocompatible polymer or polymer-lipid microbubbles can improve bioavailability and potency while reducing systemic toxicity, resulting in a higher therapeutic index. Objective: Double emulsion, the most common method for microbubble fabrication suffers from low encapsulation efficiency and wide size distributions. In this conc

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28

Xu, Jiabao, Ping Jin, Ruizhi Li, Jue Wang, and Guobiao Cai. "Numerical Study on Combustion and Atomization Characteristics of Coaxial Injectors for LOX/Methane Engine." International Journal of Aerospace Engineering 2021 (May 22, 2021): 1–16. http://dx.doi.org/10.1155/2021/6670813.

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The LOX/methane engine has an admirable performance under a supercritical state. However, the properties of methane change drastically with varying injection temperature. Because the injector can greatly affect the atomization and combustion, this study performed a three-dimensional numerical simulation of atomization, combustion, and heat transfer in a subscale LOX/methane engine to evaluate the effect of the main fluid parameters with different methane injection temperatures and different injectors on atomization performance and combustion performance. The results show that the larger propel

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29

Zhao, Zhibo, Jinkai Li, Haoyun Yuan, et al. "Electrical Characterization of Through-Silicon-via-Based Coaxial Line for High-Frequency 3D Integration (Invited Paper)." Electronics 11, no. 20 (2022): 3417. http://dx.doi.org/10.3390/electronics11203417.

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Through-silicon-via (TSV)-based coaxial line techniques can reduce the high-frequency loss due to the low resistivity in the silicon substrate and thus can improve the efficiency of vertical signal transmission. Moreover, a TSV-based coaxial structure allows easily realizing the impedance matching in RF/microwave systems for excellent electrical performance. However, due to the limitations of existing available dielectric materials and the difficulties and challenges in the manufacturing process, ideal coaxial TSVs are not easy to obtain, and thus, the achieved electrical performance might be

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30

Cameron, Christopher, Jayant Sirohi, Joseph Schmaus, and Inderjit Chopra. "Performance and Loads of a Reduced-Scale Coaxial Counterrotating Rotor." Journal of the American Helicopter Society 64, no. 4 (2019): 1–15. http://dx.doi.org/10.4050/jahs.64.042003.

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The results of hover and wind tunnel tests of a reduced-scale, closely spaced, rigid, coaxial counterrotating rotor system are presented, along with results from a comprehensive analysis. The system features two-bladed upper and lower rotors, 2.03 m in diameter, with uniform section, untwisted rotor blades. Measurements include upper and lower rotor steady and vibratory hub loads, as well as control angles and control loads. Blade tip clearance was measured using an optical sensor. The rotor system was tested in hover and at advance ratios between 0.21 and 0.53, at collective pitches ranging f

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31

Catarzi, M., and G. Tofani. "Analysis of the Offset QUASAT Antenna." Symposium - International Astronomical Union 129 (1988): 447–48. http://dx.doi.org/10.1017/s0074180900135235.

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In the ESA phase A of the Quasat project the use of a 10 m offset antenna, has been suggested (1). In the present work the use of the multifrequency coaxial feed, developed by ESA for the symmetric configuration, is analyzed with a multireflector configuration. The coaxial feed has the advantage of a more compact configuration. However reduced efficiency and higher cross polarization are expected at the lower frequency, due to the scattering on the subreflector surfaces.

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Yang, Fuxiang, Fangchao Dang, Xingjun Ge, Juntao He, Jinchuan Ju, and Xiaoping Zhang. "A compact coaxial relativistic klystron amplifier with three cascaded single-gap bunching cavities for efficient output." Physics of Plasmas 29, no. 9 (2022): 093111. http://dx.doi.org/10.1063/5.0109774.

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A compact coaxial relativistic klystron amplifier (RKA) with three cascaded bunching cavities is investigated to obtain high efficiency output in this paper. When the injection power and drift tube length are both decreased for the compactness of the initial coaxial RKA, the conversion efficiency of this device decreases to only 20%, which is mainly due to the insufficient modulation of intense relativistic electron beam (IREB). To solve this issue, three cascaded bunching cavities are designed to strengthen the modulation of IREB, and each bunching cavity is designed to a non-uniform single-g

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33

Lee, Jeong-In, Kyung-Hun Shin, Tae-Kyoung Bang, Jang-Young Choi, Kyong-Hwan Kim, and Keyyong Hong. "Comparison of Loss Characteristics of Coaxial Magnetic Gear According to Three Types." International Journal of Engineering & Technology 7, no. 4.39 (2018): 18–21. http://dx.doi.org/10.14419/ijet.v7i4.39.23691.

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Background/Objectives: Recently, there has been a problem of instability in rare earth prices worldwide. Due to these problems, various structures are being studied to minimize the use of permanent magnets.Methods/Statistical analysis: In this paper, we analyze the loss characteristics of three different types of coaxial magnetic gear (CMG)s using two - dimensional finite element analysis.Findings: This paper, 3 types of CMGs have been analyzed by using the 2-D FEA. The shapes used for the analysis are three types: Surface mounted coaxial magnetic gear (SMCMG), Consequent pole coaxial magnetic

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34

Melekhov, Vladimir I., Ivan I. Solovev, and Nataliya G. Ponomareva. "Formation of Coaxial Fields of Residual Stresses in the Circular Saw Blade." Lesnoy Zhurnal (Forestry Journal), no. 2 (April 1, 2022): 170–77. http://dx.doi.org/10.37482/0536-1036-2022-2-170-177.

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The working tool of machines with circular cutting units is a circular saw, the condition of which largely determines the quality of material processing. Circular saw blades in the process of operation are subjected to a complex effect of force and temperature factors that cause elongation and deformation of the saw blade, and the occurrence of internal stresses that take it out of the flat form of elastic balance and reduce the tool’s performance. The ability of saws to resist these factors is determined by the rigidity and stability of the saw blade. It is customary to consider a circular sa

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Chen, Zhi, Daobo Wang, and Ziyang Zhen. "Modelling and hovering control for a coaxial unmanned helicopter using sliding mode." Aircraft Engineering and Aerospace Technology 90, no. 5 (2018): 815–27. http://dx.doi.org/10.1108/aeat-05-2016-0075.

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Purpose To facilitate the nonlinear controller design, dynamic model of a novel coaxial unmanned helicopter (UH) is established and its coupling analysis is presented. Design/methodology/approach The chattering-free sliding mode controller (SMC) with unidirectional auxiliary surfaces (UASs) is designed and implemented for the coaxial ducted fan UH. Findings The coupling analysis based on the established model show severe coupling between channels. For coaxial UH’s special model structure, UAS-SMC controller is proposed to reduce the coupling characteristics between channels of the UH by settin

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Yuan, Chenhu, Zenggan Bian, Yue Cao, et al. "Fabrication of Micro-Holes with High Aspect Ratios in Cf/SiC Composites Using Coaxial Waterjet-Assisted Nanosecond Laser Drilling." Micromachines 16, no. 7 (2025): 811. https://doi.org/10.3390/mi16070811.

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In the present study, the coaxial waterjet-assisted nanosecond laser drilling of micro-holes in Cf/SiC composites, coupled with nanosecond laser drilling in air for fabricating micro-holes with high aspect ratios, were investigated. The surface morphology, reaction products, and micro-hole shapes were thoroughly examined. The results reveal that, for the coaxial waterjet-assisted nanosecond laser drilling of micro-holes in the Cf/SiC composite, the increasing of waterjet velocity enhances the material removal rate and micro-hole depth, but reduces the micro-hole diameter and taper angle. The c

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Usenko, Vyacheslav, Kateryna Balalaieva та Mykhailo Mitrakhovych. "Ефективна тяга співвісного закапотованого гвинтовентилятора". Aerospace Technic and Technology, № 4sup2 (29 серпня 2024): 25–30. http://dx.doi.org/10.32620/aktt.2024.4sup2.04.

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The subject of this study was the effective thrust of a ducted coaxial propfan. The object of this study was a ducted coaxial propfan of a turbopropfan engine. Purpose: This study estimates the change in the effective thrust of the ducted coaxial propfan from the M value in the cruising mode of operation. In order to achieve this goal, the following tasks were set and solved: to obtain the dependence of the thrust force of a ducted coaxial propfan for Mach numbers ranging from 0.5 to 0.7 at cruising altitude; obtain the dependence of the resistance force of a ducted coaxial propfan for Mach nu

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Chen, Zhi, Daobo Wang, Ziyang Zhen, Biao Wang, and Jian Fu. "Take-off and landing control for a coaxial ducted fan unmanned helicopter." Aircraft Engineering and Aerospace Technology 89, no. 6 (2017): 764–76. http://dx.doi.org/10.1108/aeat-01-2016-0017.

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Purpose This paper aims to present a control strategy that eliminates the longitudinal and lateral drifting movements of the coaxial ducted fan unmanned helicopter (UH) during autonomous take-off and landing and reduce the coupling characteristics between channels of the coaxial UH for its special model structure. Design/methodology/approach Unidirectional auxiliary surfaces (UAS) for terminal sliding mode controller (TSMC) are designed for the flight control system of the coaxial UH, and a hierarchical flight control strategy is proposed to improve the decoupling ability of the coaxial UH. Fi

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Li, Liang, Chenglong Zhou, Ming Chen, Fang Wang, and Anan Xu. "The Influence of Rotor Overlapping Azimuth on Compound Coaxial Helicopter Performance Based on Unsteady CFD Simulation." Applied Sciences 13, no. 2 (2023): 820. http://dx.doi.org/10.3390/app13020820.

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In this paper, a computational fluid dynamics simulation method is developed to study the influence of the rotor overlapping azimuth on the aerodynamic performance of compound coaxial helicopter. The simulation method is verified by comparing the numerical simulation results with the wind tunnel experiment data of the NASA coaxial rotor. Two overlapping azimuths of the upper and lower blades are considered, and the aerodynamic performance of the isolated rotor and the compound coaxial helicopter in hover and forward are analyzed respectively. State 1 means the upper and lower blades overlap at

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Girenko, D., B. Murashevych, and A. Velichenko. "Synthesis of sodium hypochlorite solutions in coaxial flow cells in current reverse mode." Voprosy Khimii i Khimicheskoi Tekhnologii, no. 6 (December 2023): 59–67. http://dx.doi.org/10.32434/0321-4095-2023-151-6-59-67.

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Electrodes made of platinized titanium with a surface platinum content of 2–3 mg/cm2 can be used in non-diaphragm flow- and accumulative-type electrolyzers for the electrolysis of low-concentrated NaCl solutions in order to obtain pure NaClO solutions. If electrolysis of 0.15 M NaCl solution is carried out on platinized titanium electrodes in the usual mode at current densities of 20–40 mA/cm2, then the anode surface passes into an oxidized passive state. In this case, the current efficiency of hypochlorite does not exceed 40%, and the current efficiency of chlorate is more than 20%. During a

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Tzouganakis, Panteleimon, Vasilios Gakos, Christos Kalligeros, Christos Papalexis, Antonios Tsolakis, and Vasilios Spitas. "Torque Calculation and Dynamical Response in Halbach Array Coaxial Magnetic Gears through a Novel Analytical 2D Model." Computation 12, no. 5 (2024): 88. http://dx.doi.org/10.3390/computation12050088.

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Coaxial magnetic gears have piqued the interest of researchers due to their numerous benefits over mechanical gears. These include reduced noise and vibration, enhanced efficiency, lower maintenance costs, and improved backdrivability. However, their adoption in industry has been limited by drawbacks like lower torque density and slippage at high torque levels. This work presents an analytical 2D model to compute the magnetic potential in Halbach array coaxial magnetic gears for every rotational angle, geometry configuration, and magnet specifications. This model calculates the induced torques

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No, Nguyen Tan, Le Hong Ky, and Duong Tan Dat. "Modeling and Control of a Coaxial Parallel Spherical Mechanism." WSEAS TRANSACTIONS ON SYSTEMS AND CONTROL 19 (December 23, 2024): 368–72. https://doi.org/10.37394/23203.2024.19.39.

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This paper presents a method for modeling and controlling a coaxial parallel spherical mechanism. This mechanism consists of elements connected to allow them to move relative to each other in a parallel and coaxial manner, forming a spherical structure capable of rotating and moving in multiple directions. The operation of the mechanism is controlled by a high-order sliding controller to improve control performance, reduce chattering phenomena, and mitigate disturbances during operation. The system’s stability using the suggested control approach is demonstrated and analyzed in detail through

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Wang, Chang, Minqi Huang, Xianmin Peng, Guichuan Zhang, Min Tang, and Haowen Wang. "Wind Tunnel Studies on Hover and Forward Flight Performances of a Coaxial Rigid Rotor." Aerospace 8, no. 8 (2021): 205. http://dx.doi.org/10.3390/aerospace8080205.

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The aerodynamic performance of a reduced-scale coaxial rigid rotor system in hover and steady forward flights was experimentally investigated to gain insights into the effect of interference between upper and lower rotors and the influences of the advance ratio, shaft tilt angle and lift offset. The rotor system featured by 2 m-diameter, four-bladed upper and lower hingeless rotors and was installed in a coaxial rotor test rig. Experiments were conducted in the Φ3.2 m wind tunnel at China Aerodynamics Research and Development Center (CARDC). The rotor system was tested in hover states at colle

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Cherepanov, Aleksandr, Vasily Zakaryukin, and Andrey Kryukov. "Modeling of traction power supply systems for movement of high-speed trains." MATEC Web of Conferences 216 (2018): 02006. http://dx.doi.org/10.1051/matecconf/201821602006.

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Upgrading of traction power supply systems will be required to transfer electrified railway lines to high-speed traffic. Coaxial cables and balancing transformers can be used as technical upgrading means. The article presents the results of computer simulation in the Fazonord software complex of the traditional 2x25 kV traction system, as well as systems with coaxial cables and Woodbridge symmetric transformers. Simulation results showed that the use of cables contributes to a significant increase in the level of voltage on current collectors of electric rolling stock. Use of modified Woodbrid

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Wicker, Ryan B., and John K. Eaton. "Effect of Injected Longitudinal Vorticity on Particle Dispersion in a Swirling, Coaxial Jet." Journal of Fluids Engineering 121, no. 4 (1999): 766–72. http://dx.doi.org/10.1115/1.2823535.

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A Passive particle dispersion control technique was investigated in which longitudinal vortices were injected into a developing coaxial swirling jet with sufficient annular swirl for flow recirculation to occur. Four vortex generators, separated by 90 degrees and placed along the outside of the annular nozzle, injected vorticity opposite in sign to the mean swirl, significantly altering the structure of the swirling jet. The injected vorticity competed with the mean swirl to reduce azimuthal particle flinging and to disrupt the development of the vortex rings in the outer shear layer. Axial fl

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Wang, Tsili. "A weak-anisotropy approximation to multicomponent induction responses in cross-bedded formations." GEOPHYSICS 71, no. 4 (2006): F61—F66. http://dx.doi.org/10.1190/1.2216933.

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The multicomponent induction logging response to a cross-bedded formation has been modeled under a weak-anisotropy approximation. With the approximation, a cross-bedded formation can be modeled as a transversely isotropic (TI) medium. The validity of the approximation has been tested for the main (coplanar and coaxial) components of the induction response. The conditions for the weak-anisotropy approximation to be valid depend on the component of the response. For the coplanar components, the approximation is valid for an anisotropy ratio up to 2 if the relative dipping angle between the cross

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Chun, Se Min, Geum Ran Ahn, Geon Woo Yang, Hee Jae Lee, and Yong Cheol Hong. "Sterilization of Water-Based Cutting Fluids Using Compact Air-Cooled Coaxial Dielectric Barrier Discharge Reactor with Bubbler." Applied Sciences 13, no. 22 (2023): 12302. http://dx.doi.org/10.3390/app132212302.

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Odor and discoloration in water-based cutting fluids are caused by the growth of microorganisms and putrefying bacteria. This significantly reduces cutting performance, prevents rust, and deteriorates the working environment. To overcome these drawbacks, we developed a compact air-cooled coaxial dielectric barrier discharge (DBD) with a bubbler. Bacteria and microorganisms living in waste cutting fluids were sterilized by the high concentration of ozone produced under the optimized conditions of the compact air-cooled coaxial DBD. Moreover, it was confirmed that 99.99% of bacteria and microorg

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(Henry) Jia, Zhongqi, Seongkyu Lee, Kalki Sharma, and Kenneth S. Brentner. "Aeroacoustic Analysis of a Lift-Offset Coaxial Rotor Using High-Fidelity CFD/CSD Loose Coupling Simulation." Journal of the American Helicopter Society 65, no. 1 (2020): 1–15. http://dx.doi.org/10.4050/jahs.65.012011.

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This paper presents the aeroacoustic analysis of a lift-offset coaxial rotor in high-speed forward flight using the high-fidelity computational fluid dynamics/computational structural dynamics (CFD/CSD) loose coupling software Helios. Acoustic simulations are performed using the software PSU-WOPWOP at eight microphones positioned below the coaxial rotor. The total power of the three speed cases—100, 150, and 200 kt—is validated against flight-test data and shows good agreement. A series of parametric studies is also conducted to investigate the effect of lift offset, flight speed, and rotor-to

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Li, Jiayao, Yinan Liu, and Hend Abdelhakim. "Drug Delivery Applications of Coaxial Electrospun Nanofibres in Cancer Therapy." Molecules 27, no. 6 (2022): 1803. http://dx.doi.org/10.3390/molecules27061803.

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Cancer is one of the most serious health problems and the second leading cause of death worldwide, and with an ageing and growing population, problems related to cancer will continue. In the battle against cancer, many therapies and anticancer drugs have been developed. Chemotherapy and relevant drugs are widely used in clinical practice; however, their applications are always accompanied by severe side effects. In recent years, the drug delivery system has been improved by nanotechnology to reduce the adverse effects of the delivered drugs. Among the different candidates, core–sheath nanofibr

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Xu, Zhi Gang, Rui Hu Zhou, and Hong Yan Gan. "A New Research of Laser Welding Coaxial Protection Nozzle." Advanced Materials Research 314-316 (August 2011): 1222–25. http://dx.doi.org/10.4028/www.scientific.net/amr.314-316.1222.

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Because the side-blown protection effect in the laser welding is insufficient, and its convenience and flexibility are restricted. Laser welding coaxial protection nozzle is designed and trial-manufactured. According to the characteristics of laser welding protection, through rational design of nozzle structure, two protection gases are respective controlled .Using the coaxial nozzle for stainless steel laser stitch welding test, its influence on protect effect and the welding process are analyzed. The result indicates that the structure of nozzle’s gas path, gas outlet designed reasonable, ve

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