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Journal articles on the topic 'Floating ring'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Bae, Joon-Hwan, Hyun-Duck Kwak, Sung-Jae Heo, Chang-Ho Choi, and Jong-Soo Choi. "Numerical and Experimental Study of Nose for LOx Floating Ring Seal in Turbopump." Aerospace 9, no. 11 (2022): 667. http://dx.doi.org/10.3390/aerospace9110667.

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Floating ring seals are widely used as a leakage control solution for turbomachines because they effectively operate with small clearances between the shaft and seal. The oxidizer pump of the 7 tonf liquid engine in the Korea Space Launch Vehicle II (KSLV-II) operates at high rotational speeds and under cryogenic conditions and has floating ring seals in the bearing cooling path to reduce leakages. In this study, we evaluated the frictional force acting on the nose of the floating ring in the oxidizer pump of the 7 tonf turbopump using numerical analysis, and we investigated the radial force o

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2

Peng, Liqiang, Huiping Zheng, and Zhanqun Shi. "Performance of Relative Clearance Ratio of Floating Ring Bearing for Turbocharger-Rotor System Stability." Machines 9, no. 11 (2021): 285. http://dx.doi.org/10.3390/machines9110285.

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The floating ring bearing (FRB) has been widely used in the field of high-speed rotating machinery such as turbochargers, aviation engines and so on, because of its simple structure, high efficiency and low power consumption. In order to obtain the best ratio between inter-oil clearance and shaft radius of the floating ring bearing necessitates the design reference of dimensional parameters for the design of floating ring bearings. This study, based on the transfer-matrix method, developed the dynamic model of the floating ring bearing-rotor system, and, using the Runge–Kutta analysis method f

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3

Li, Jiaqi, Jimin Ni, and Qiwei Wang. "Lubrication Analysis of Floating Ring Bearings Considering Floating Ring Heat Transfer." SAE International Journal of Fuels and Lubricants 9, no. 1 (2016): 14–22. http://dx.doi.org/10.4271/2016-01-0485.

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4

Xu, Fang, Zhi Gang Zhou, and Guo Rong Wang. "The Experimental Research on Friction and Wear of the New Type Rock Bit Floating Ring Journal Bearing." Applied Mechanics and Materials 120 (October 2011): 134–37. http://dx.doi.org/10.4028/www.scientific.net/amm.120.134.

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A new type rock bit floating ring journal bearing is designed to solve the current problems of large heat, excessive wear and short life of rock bit journal bearing in high-speed and heavy-loads conditions, and the experimental research on friction moment, temperature rising and friction loss of bearings are carried out in different parameters and different working conditions. The experimental results show that the floating ring speed is changed because of the influence of loads and cone speed, the mean speed of floating ring remains relatively constant when the loads and the cone speed are co

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5

Zhang, Congcong, Yongliang Wang, Rixiu Men, Hong He, and Wei Chen. "Dynamic behaviors of a high-speed turbocharger rotor on elliptical floating-ring bearings." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 233, no. 12 (2019): 1785–99. http://dx.doi.org/10.1177/1350650119849743.

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Floating-ring bearings are commonly used in automotive turbocharger applications due to their low cost and their suitability under extreme rotation speeds. This type of bearings, however, can become a source of noise due to oil whirl-induced sub-synchronous vibrations. The scope of this paper is to examine whether the concept of a floating-ring bearing with an elliptical clearance might be a solution to suppress sub-synchronous vibrations. A very time-efficient approximate solution for the Reynolds equation to the geometry of elliptical bearings is presented. The nonlinear dynamic behaviors of

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6

Dong, X., and Z. Zhao. "Experimental and Analytical Research on Floating-Ring Bearings for Engine Applications." Journal of Tribology 112, no. 1 (1990): 119–22. http://dx.doi.org/10.1115/1.2920215.

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This study deals with whether floating-ring journal bearings can be applied to engine bearings or not. The performance of floating-ring journal bearings with nonstationary load is analyzed. The main bearings of a S195 4-stroke diesel engine are replaced by floating-ring bearings and an experiment is carried out with success. After the engine starting, the ring lifts off when crankshaft speeds approach seven hundred and forty rpm. The ring maintains its rotation until crankshaft speeds decrease to two hundred rpm, during its deceleration to a stop. Once the ring lifts off it remains in normal w

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7

Guo, Hong, and Shao Lin Zhang. "Floating Ring Balance Analysis of Journal Floating Ring Hybrid Bearing in Turbulent Regime." Applied Mechanics and Materials 672-674 (October 2014): 1637–41. http://dx.doi.org/10.4028/www.scientific.net/amm.672-674.1637.

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An externally pressurized deep/shallow pockets hybrid journal floating ring bearing compensated by flat capillary restrictor which can meet the need of high speed rotating machinery is presented in this paper. Bases on turbulent flow theory, the equations governing the flow of inner and outer fluid film in the journal floating ring bearing are established. The control equations together with the pressure boundary condition and the restrictor flow equation are solved by using the Finite Element Method. The balance of floating ring is achieved by adjusting ring-to-shaft speed ratio, inner film r

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8

Dai, Yu Jie. "Hydrodynamic Characteristics of Dislocated Floating Ring Bearing with Different Eccentricities." Applied Mechanics and Materials 52-54 (March 2011): 152–55. http://dx.doi.org/10.4028/www.scientific.net/amm.52-54.152.

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For obtain the effect of floating ring radius R2 and floating ring velocity v2 on internal friction in dislocated floating ring with different eccentricities, the evolution of internal friction is simulated with boundary element method (BEM). Numerical simulation results show that internal friction increases with the increase of eccentricity. Internal friction rises linearly as the addition of floating ring velocity v2 if the eccentricity e and radius R2 are fixed. When the velocity v2 is a constant and the range of R2 is 0.75<R2<0.8, the internal friction increase enormously.

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9

Xia, Peng, Hui Chen, Zhansheng Liu, Wensheng Ma, and Baofeng Yang. "Analysis of whirling motion for the dynamic system of floating ring seal and rotor." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 233, no. 8 (2019): 1221–35. http://dx.doi.org/10.1177/1350650119829374.

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In turbopumps, the dynamic characteristics of the floating ring seal and rotor system are important, especially when the floating ring seal fails to lock up. To investigate the motion of the system with the unlocked floating ring seal, a dynamic model for the whirling system is established in this study. On the basis of the perturbation method, the nonlinear model is simplified into a steady whirling model superimposed with perturbation motion. The transient bulk flow model is improved to calculate the hydrodynamic force in the seal clearance. The results show that the floating ring seal is ab

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10

Park, Jeong Cheol, and Chien Ming Wang. "Hydrodynamic Behaviour of a Floating Polygonal Platform Centrally Placed within a Polygonal Ring Structure under Wave Action." Journal of Marine Science and Engineering 10, no. 10 (2022): 1430. http://dx.doi.org/10.3390/jmse10101430.

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In this paper, a semi-analytical method has been developed for the hydrodynamic analysis of a floating polygonal platform that is centrally placed within a floating polygonal ring structure under wave action. In view to understand the wave interactions inside the ring structure, the formulation considers two cases: when the platform and ring structure oscillate individually, and when they oscillate together under wave action. The polygonal shapes of the floating structures can be created from a parametric equation involving the cosine-type radial perturbation. The formulation and computer code

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11

Han, Jian Yong, and Guo Jing Chen. "Numerical Simulation Analysis of Centrifugal Pump Floating Ring Seal." Advanced Materials Research 317-319 (August 2011): 2148–51. http://dx.doi.org/10.4028/www.scientific.net/amr.317-319.2148.

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According to the studying on the force analysis of floating ring of centrifugal pump, the paper think that floating ring stress will change with the change of centrifugal pump’ s condition. Using fluent software, the floating ring seal was simulated and analyzed. Results show that the liquid force acted on the floating ring is nonuniform and asymmetrical as wedging effect, and that section maximum pressure is not lies in the smallest clearance place, but in the wedge area where liquid flows to the minimum clearance, because the effect of Leak resistance is better in high pressure than low pres

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12

Wang, Xue Hui, and Yu Jie Dai. "Evolution of Pressure on Bearing's Surface in Dislocated Single Floating Ring Bearing." Advanced Materials Research 580 (October 2012): 428–31. http://dx.doi.org/10.4028/www.scientific.net/amr.580.428.

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The pressure on bearing’s surface in the dislocated single floating ring bearing with different radius of floating ring (Rf) and velocity of floating ring (Uf) were simulated by boundary element method (BEM). The numerical results indicate that the pressure on bearing increases with the increases of Ufwhen displacement of bearing (DR) is fixed. The pressure on bearing increases with the increases of Rfwhen DR is fixed. The pressure on bearing increases with the increases of DR when Rfis fixed.

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13

Bin, Guangfu, Liang Zhang, Feng Yang, and Anhua Chen. "The Influence of Ring-Speed Ratio Dynamic Change on Nonlinear Vibration Response of High-Speed Turbocharger Rotor System." Shock and Vibration 2021 (October 28, 2021): 1–9. http://dx.doi.org/10.1155/2021/9649232.

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The ring-speed ratio is a comprehensive dynamic index of floating ring bearing structure and operating parameters, which directly affects the dynamic behavior of the turbocharger rotor system. The cross stiffness of ring-speed ratio and floating ring bearing and the work of oil film force are analyzed. The influence of dynamic ring-speed ratio change on the vibration response of floating ring bearing was studied. The finite element model of the rotor-floating ring bearing system is constructed; its model parameters are verified through the measured critical rotor speed. Newmark integral method

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14

Zhang, Congcong, Yongliang Wang, Rixiu Men, Hong He, and Wei Chen. "The effect of three-lobed bearing shapes in floating-ring bearings on the nonlinear oscillations of high-speed rotors." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 234, no. 5 (2019): 751–69. http://dx.doi.org/10.1177/1350650119873802.

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Floating-ring bearings are widely used in automotive turbocharger machinery because of their robustness, low cost and their suitability under extreme rotation speeds. This type of bearings, however, can become a source of noise due to oil whirl/whip instability. The stabilizing effect of lobed bearing shape is known in the literature, which encourages the researchers to substitute plain cylindrical full floating bearings with lobed geometries in their outer and inner clearances to prevent the rotor-bearing system from developing oil whirl/whip instability or to reduce its amplitude of response

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15

Song, Zifeng, Shuangxi Li, Xiaozhu Chen, Zhiyuan Liu, Tan Zhao, and Baiqi Huang. "Study on the Service Performance of a Two-Stage Floating-Ring Isolation Seal for a High-Speed Turbopump with a Cryogenic Medium." Machines 11, no. 3 (2023): 373. http://dx.doi.org/10.3390/machines11030373.

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The reliability and stability of the seal at the fuel-supply end of a rocket-engine turbopump are important factors in determining safety. Conventional single-stage floating rings used for the isolation-sealing of cryogenic media are highly susceptible to operational instability during startup and shutdown, which places demands on the seals’ structure, size, and material properties. In this study, a two-stage floating-ring isolation seal with a non-slotted main sealing surface was designed using a tangential air-intake mode. Based on the full-size three-dimensional finite-volume model, the lea

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16

Soni, Sandeep, and DP Vakharia. "A steady-state performance analysis of a non-circular cylindrical floating ring journal bearing." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 231, no. 1 (2016): 41–56. http://dx.doi.org/10.1177/1350650116645027.

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This paper analyses the steady-state performance behaviour of a new type of journal bearing, i.e. the non-circular cylindrical floating ring journal bearing. It consists of a floating ring in between the shaft and the upper and lower lobes of a two-lobe bearing. The journal and the inner surface of the ring are cylindrical while bearing surfaces are non-circular. The classical Navier–Stokes equations in the modified form together with the continuity equation are being solved by the finite element method. The cylindrical coordinates form of the Navier–Stokes equation and continuity equation are

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17

Crawford, Neil R. "Regarding fixed ring and floating ring pure moment application." Journal of Biomechanics 44, no. 7 (2011): 1423–26. http://dx.doi.org/10.1016/j.jbiomech.2010.07.041.

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18

Zhu, Shuhai, Runmei Ma, Shuangxi Li, and Shicong Li. "Dynamic Performance Analysis of Gas Film Floating Ring Seals Based on the Reynolds–Bernoulli Small-Perturbation Model." Machines 12, no. 12 (2024): 860. http://dx.doi.org/10.3390/machines12120860.

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Gas film floating ring seals are extensively utilized in aircraft engines, and precise analysis of gas film performance is crucial for ensuring reliable seal design. For this reason, this paper proposes the Reynolds–Bernoulli small-perturbation (RBSP) model to analyze the performance of the gas film based on the conservation of mechanical energy. Through experimental verification and comparison with other analytical models, the results of the RBSP model calculations are both reliable and more broadly applicable. Analyses using the finite element method revealed that the differential pressure e

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19

Xia, Peng, Zhan-sheng Liu, Jia-jia Yan, and Guang-hui Zhang. "Lock-up characteristics of floating ring seals considering rotor whirling motion." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 232, no. 4 (2017): 437–52. http://dx.doi.org/10.1177/1350650117718657.

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This paper presents a lock-up condition with rotor whirling motion to predict the lock-up area for floating ring seals in liquid turbopumps. To calculate the hydrodynamic forces with arbitrary rotor motion, bulk flow model is modified with explicitly considering the squeeze velocity and temporal inertia. Finite element method is implemented to solve the transient nonlinear model. The effect of lock-up position on leakage and rotordynamic coefficients of floating ring seals is studied and shows insensitivity to eccentricity within moderate eccentric area (<0.5), which indicates that predicti

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20

Wang, Xue Hui, Yu Jie Dai, and Jiu Qing Hao. "Numerical Simulation of Frictional Dissipation in the Dislocated Single Floating Ring Bearing." Advanced Materials Research 580 (October 2012): 59–62. http://dx.doi.org/10.4028/www.scientific.net/amr.580.59.

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The frictional dissipation in the dislocated single floating ring bearing is simulated by boundary element method (BEM). The advantage of BEM is that it can reduce the numerical simulation error and increase the numerical efficiency. The numerical results indicate that the total frictional dissipation decreases with the increases of the floating ring’s velocity and never change when the radius of the floating ring Rf=0.4. The evolution of total frictional dissipation is similar with the bearing’s frictional dissipation.

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21

Guo, Hong, Shuai Yang, Shaolin Zhang, and Zebin Zhang. "Influence of temperature – viscosity effect on ring-journal speed ratio and stability for a hydrodynamic floating ring bearing." Industrial Lubrication and Tribology 71, no. 4 (2019): 540–47. http://dx.doi.org/10.1108/ilt-08-2018-0329.

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Purpose The purpose of this paper is to study the influence of lubricant temperature-viscosity on the performance for a hydrodynamic journal floating ring bearing (FRB), including ring-journal speed ratio and stability. Design/methodology/approach The finite difference method was used to solve computational models of Reynolds equation, energy equation and temperature–viscosity equation. Dynamic coefficients were obtained based on the floating ring balance. The dynamic model of journal and floating ring was established to deduce the stability criterion of single mass symmetrical rigid FRB rotor

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22

Akhmetkhanov, R., L. Banakh, and A. Nikiforov. "Flow-Coupled Vibrations of Rotor and Seal." Journal of Vibration and Control 11, no. 7 (2005): 887–901. http://dx.doi.org/10.1177/1077546305054857.

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We study the flow-coupled vibrations of an unbalanced rotor and a floating sealing ring. The rotor is high speed; its operating regimes are above second critical velocity. The ring is subjected to Coulomb friction force, which prevents its motion about the casing. At rotor rotation, the intensive vibrations of rotor and floating ring take place and the hydrodynamic forces in clearance between them are dominated. Non-impact and impact regimes are revealed and the latter are very dangerous for safety. In the stationary case, the analytical solutions for impact regimes are obtained; these show th

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23

Kirk, R. G. "Transient Response of Floating Ring Liquid Seals." Journal of Tribology 110, no. 3 (1988): 572–77. http://dx.doi.org/10.1115/1.3261688.

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The design and analysis of pressure balanced seals are important to the designers and users of turbomachinery which require floating element seals. The design objective for compressor seals differs from that of the engineered pump seal but the common factor includes the ability to predict the dynamic response of the floating ring seal relative to the rotor shaft. Steady-state calculations can be used to study possible operating conditions for compressor designs, but they do not include accurate account of rotor shaft response and ring spin torque. In addition, engineered pump seal applications

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24

Soni, Sandeep, and DP Vakharia. "Performance analysis of a finite noncircular floating ring bearing in turbulent flow regime." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 231, no. 7 (2016): 869–88. http://dx.doi.org/10.1177/1350650116682656.

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The present paper investigates the turbulence effect on the steady-state performance of a new variety of journal bearing, i.e. the noncircular floating ring bearing. This particular bearing consists of the journal, floating ring, as well as lower and upper lobes. The shaft and the floating ring are cylindrical while surfaces of the bearing are noncircular. The classical Navier–Stokes equations and continuity equation in cylindrical coordinates are being satisfactorily adapted with the linearized turbulent lubrication model of Ng and Pan. These improved equations are being solved by the finite

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25

San Andres, Luis, Juan Carlos Rivadeneira, Kostandin Gjika, Christopher Groves, and Gerry LaRue. "Rotordynamics of Small Turbochargers Supported on Floating Ring Bearings—Highlights in Bearing Analysis and Experimental Validation." Journal of Tribology 129, no. 2 (2006): 391–97. http://dx.doi.org/10.1115/1.2464134.

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Turbochargers (TCs) improve performance in internal combustion engines. Due to low production costs, TC assemblies are supported on floating ring bearings (FRBs). TCs show subsynchronous motions of significant amplitudes over a wide speed range. However, the subsynchronous whirl motions generally reach a limit cycle enabling continuous operation. The paper advances progress on the validation against measurements of linear and nonlinear rotordynamic models for predicting shaft motions of automotive TCs. A comprehensive thermohydrodynamic model predicts the floating ring speeds, inner and outer

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26

Бадун, О. П., та Я. Н. Иванов. "ПЛАВАЮЧЕ КІЛЬЦЕ ЯК ДЖЕРЕЛО ЗГИНАЛЬНИХ КОЛИВАНЬ РОТОРА". Aerospace Technic and Technology, № 7 (7 липня 2017): 84–89. http://dx.doi.org/10.32620/aktt.2017.7.12.

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The most usual type of seal round impeller’s collars for LPE TP is a floating ring. The article describes that on certain conditions the floating ring may be a source of bending oscillation occurrence in rotor and stipulates the importance of the rotor dynamics examination within the system “seal-rotor-bearing”. At the same time authors propose a mechanism of the bending oscillation occurrence, show the results of the floating rings testing with various designs and their influence on the ball bearings status, as well as show the results of the rotor development supported by two ball bearings w

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27

Amamou, Amira. "Nonlinear stability analysis and numerical continuation of bifurcations of a rotor supported by floating ring bearings." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 236, no. 5 (2021): 2172–84. http://dx.doi.org/10.1177/09544062211026340.

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Floating ring bearings have been widely used, over the last decades, in rotors of automotive turbochargers because of their improved damping behavior and their good emergency-operating capabilities. They also offer a cost-effective design and have good assembly properties. Nevertheless, rotors with floating ring bearings show vibration effects of nonlinear nature induced by self-excited oscillations originating from the bearing oil films (oil whirl/whip phenomena) and may exhibit various nonlinear vibration effects which may cause damage to the rotor. In order to investigate these dynamic phen

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28

Shi, Mingming, Yongfeng Yang, Wangqun Deng, Jianjun Wang, and Chao Fu. "Analysis of Dynamic Characteristics of Small-Scale and Low-Stiffness Ring Squeeze Film Damper-Rotor System." Applied Sciences 12, no. 14 (2022): 7167. http://dx.doi.org/10.3390/app12147167.

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Rotor machinery supports are susceptible to fracture arising from multi-period or irregular transient vibration and even the inconspicuous fatigue phenomenon. The novel dynamic model of a rotor mounted on the floating ring squeeze film damper (SFD) was developed. The proposed SFD implements low stiffness and small scale to overcome the deficiency. Based on the theory of hydrodynamic lubrication, the Reynolds equations on the working principle of the floating ring are established. Then, the dynamic characteristics of the rotor system during maneuvers, with the floating ring SFD supports, are su

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29

Guo, Hong, Bo Qian Xia, and Shao Qi Cen. "Performance Analysis of High Speed Floating Ring Hybrid Bearing in the Laminar and Turbulent Regimes." Advanced Materials Research 197-198 (February 2011): 1776–80. http://dx.doi.org/10.4028/www.scientific.net/amr.197-198.1776.

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This paper presents a theoretical study concerning the static and dynamic characteristics of high speed journal floating ring hybrid bearing compensated by interior restrictor under laminar flow and turbulent flow respectively. The turbulent flow fluid film control equations and the pressure boundary conditions of this floating ring bearing together with the restrictor flow equation are solved by using the Finite Element Method. The variation regularity of static and dynamic characteristics such as load capacity, friction power loss, stiffness, damping etc. is analyzed. By comparing the lamina

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30

Amamou, A., and M. Chouchane. "Non-linear stability analysis of floating ring bearings using Hopf bifurcation theory." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 225, no. 12 (2011): 2804–18. http://dx.doi.org/10.1177/0954406211413520.

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Floating ring bearings are used to support and guide rotors in several high-speed rotating machinery applications. They are usually credited for lower heat generation and higher vibration suppressing ability. Similar to conventional hydrodynamic bearings, floating ring bearings may exhibit unstable behaviour above a certain stability critical speed. Linear stability analysis is usually applied to predict the stability threshold speed. Non-linear stability analysis, however, is needed to predict the presence and the size of stable limit cycles above the stability threshold speed or unstable lim

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31

Wang, Yan, Xiao-dong Ren, Xue-song Li, and Chun-wei Gu. "Numerical investigation of subsynchronous vibration in floating ring bearings." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 232, no. 11 (2018): 1390–401. http://dx.doi.org/10.1177/1350650117753915.

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Floating ring bearings are popular among turbochargers due to their simplicity and reliability. The disappearance of subsynchronous vibration with the increase of shaft speed in a low oil-supplied pressure floating ring bearing is reported by Hatakenaka and Yanai. This finding may help eliminate the noise and decrease the loss of turbochargers. This work aims to explain this phenomenon in the low oil-supplied floating ring bearing using computational fluid dynamic. Steady computational fluid dynamic calculation is conducted to validate the effect of air entrainment. Transient computational flu

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32

Marwood, W. "Generalised systolic ring serial floating point multiplier." Electronics Letters 26, no. 11 (1990): 753–54. http://dx.doi.org/10.1049/el:19900492.

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33

Rezvani, M. A., and E. J. Hahn. "Floating ring squeeze film damper: theoretical analysis." Tribology International 33, no. 3-4 (2000): 249–58. http://dx.doi.org/10.1016/s0301-679x(00)00038-4.

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34

Banakh, L. Y., A. N. Nikiforov, and G. Y. Panovko. "Some Features of Rotor Dynamics inside Floating Sealing Ring." Solid State Phenomena 113 (June 2006): 247–51. http://dx.doi.org/10.4028/www.scientific.net/ssp.113.247.

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Flow-coupled vibrations of system “rotor-ring” are researched. Absence effect of critical rotor velocity and dynamic absorption of rotor vibration in the system “rotor-ring” is described. These properties are caused by aero(hydro)dynamic forces in the clearance between rotor and ring. Result of lowered vibration for high-speed rotor of turbo-pump containing floating sealing rings is submitted.

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35

Zhang, Congcong, Rixiu Men, Yongliang Wang, Hong He, and Wei Chen. "Experimental and numerical investigation on thermodynamic performance of full-floating ring bearings with circumferential oil groove." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 233, no. 8 (2019): 1182–96. http://dx.doi.org/10.1177/1350650119826421.

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Floating ring bearing systems in engine-oil lubricated turbochargers commonly withstand severe radial and axial thermal gradients. An engineered thermal management of the heat flows out of the bearing system is paramount in order to ensure the component's mechanical integrity and the reliability of the bearing systems. Therefore, oil flow plays an important role in maintaining an uninterrupted oil film and removing a large fraction of the thermal energy generated by rotational drag and the heat flow disposed from a hot shaft to cool the bearings. The floating rings usually feature circumferent

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36

Yamaguchi, David K. "More on estimating the statistical significance of cross-dating positions for "floating" tree-ring series." Canadian Journal of Forest Research 24, no. 2 (1994): 427–29. http://dx.doi.org/10.1139/x94-058.

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Tabulated Student's t-values and climatic insensitivity among inner tree-ring widths can bias estimates of statistical significance for cross correlations relating "floating" and master tree-ring series. These biases can be removed by (i) directly computing significance levels for cross-correlation coefficients at dating positions and (ii) deleting insensitive inner rings from a dated floating sample before final correlation analysis. The number of early rings to delete can be determined from plots of cross-correlation coefficients linking a dated floating series of artificially decreasing len

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37

Xu, Lishan, Weizheng Zhang, Junjie Lu, and Zhu Liu. "Influence of Floating Ring Seal Working Condition Parameters on the Dynamic Characteristics of Transient Gas Film." Journal of Physics: Conference Series 2108, no. 1 (2021): 012087. http://dx.doi.org/10.1088/1742-6596/2108/1/012087.

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Abstract The high requirements for sealing performance in high-speed rotating machinery has led to the design of floating seal with annular spiral groove that offer the advantages of low leakage and extended stability. However, efforts to model the dynamic performance of these floating seal have suffered from the great complexity of the flow field. The present work addresses this issue by establishing a transient Reynolds formulation of a floating seal with annular spiral groove in a rotating coordinate system based on the small perturbation method. In addition, the influence of radial eccentr

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38

Shapiro, W., C. Lee, and H. Jones. "Analysis and Design of a Gas-Lubricated, Sectored, Floating Ring Seal." Journal of Tribology 110, no. 3 (1988): 525–31. http://dx.doi.org/10.1115/1.3261666.

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Helium buffered floating-ring seals used in cryogenic turbopumps are sujbect to large temperature variations, shaft centrifugal growth, and dynamic shaft excursions. To prevent dangerous contact friction over a wide range of operating conditions generally requires liberal clearances with consequent high leakage. Reduction of helium consumption translates into lower space vehicle helium storage requirements and thus increased payload. A hydrostatic sectored floating-ring seal is described with self-adjusting clearance capabilities that enables the seal to operate with small clearances over the

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Pearson, Charlotte L., Tomasz Ważny, Peter I. Kuniholm, Katarina Botić, Aleksandar Durman, and Katherine Seufer. "Potential for a New Multimillennial Tree-Ring Chronology from Subfossil Balkan River Oaks." Radiocarbon 56, no. 4 (2014): S51—S59. http://dx.doi.org/10.2458/azu_rc.56.18342.

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A total of 272 oak (Quercussp.) samples have been collected from large subfossil trees dredged from sediment deposited by the Sava and various tributary rivers in the Zagreb region of northwestern Croatia, and in northern Bosnia and Herzegovina. Measurement series of tree-ring widths from these samples produced 12 groups, totaling 3456 years of floating tree-ring chronologies spread through the last ca. 8000 years. This work represents the first step in creating a new, high-resolution resource for dating and paleoenvironmental reconstruction in the Balkan region and potentially a means to brid

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40

Pearson, Charlotte L., Tomasz Ważny, Peter I. Kuniholm, Katarina Botić, Aleksandar Durman, and Katherine Seufer. "Potential for a New Multimillennial Tree-Ring Chronology from Subfossil Balkan River Oaks." Radiocarbon 56, no. 04 (2014): S51—S59. http://dx.doi.org/10.1017/s0033822200050359.

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Abstract:

A total of 272 oak (Quercussp.) samples have been collected from large subfossil trees dredged from sediment deposited by the Sava and various tributary rivers in the Zagreb region of northwestern Croatia, and in northern Bosnia and Herzegovina. Measurement series of tree-ring widths from these samples produced 12 groups, totaling 3456 years of floating tree-ring chronologies spread through the last ca. 8000 years. This work represents the first step in creating a new, high-resolution resource for dating and paleoenvironmental reconstruction in the Balkan region and potentially a means to brid

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41

Pan, Kai, Xu Li, Youhua Fan, and Naigang Cui. "The design of the floating baffle for Cassini tank and the analysis of restraining sloshing." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 232, no. 3 (2016): 448–58. http://dx.doi.org/10.1177/0954410016680379.

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In this article, a new floating plate structure with “drive ring” is presented, which breaks the traditional idea of installing fixed baffle in a tank. In order to analyze the performance of this anti-sloshing structure, the effect of sloshing suppression and the liquid sloshing dynamics of this structure in a Cassni tank with numerical simulation is investigated. Liquid sloshing frequencies of the floating plate with different fill ratio under the circumstances of normal weight and micro-gravity were studied. At last aiming at the liquid sloshing amplitude, the suppression effect of the float

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42

Zhang, Congcong, Rixiu Men, Hong He, and Wei Chen. "Effects of circumferential and axial grooves on the nonlinear oscillations of the full floating ring bearing supported turbocharger rotor." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 233, no. 5 (2018): 741–57. http://dx.doi.org/10.1177/1350650118800581.

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It is seen that with the reduction in land areas owing to the floating-rings featured grooves, there is reduction in the load capacities and bearing torques of the oil-films, which have an influence on the nonlinear oscillations of turbocharger rotors. In the present paper, the impact of the reduced load capacities and bearing torques caused by circumferential or/and axial grooves in full-floating-ring bearings on the nonlinear oscillations of turbocharger rotors is investigated. The numerical solution of the Reynolds equation for full-floating-ring bearings with grooves by means of a finite d

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HIROMATSU, Jun, Masaharu UCHIUMI, Naoki NAGAO, and Masato EGUCHI. "J101023 Rotordynamic Fluid Forces of Floating Ring Seal." Proceedings of Mechanical Engineering Congress, Japan 2013 (2013): _J101023–1—_J101023–3. http://dx.doi.org/10.1299/jsmemecj.2013._j101023-1.

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Mak, S. Y., and K. Young. "Floating metal ring in an alternating magnetic field." American Journal of Physics 54, no. 9 (1986): 808–11. http://dx.doi.org/10.1119/1.14451.

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45

Villamor-Baliarda, A., P. Vanmeerbeek, J. Roig, P. Moens, and D. Flores. "Electric field unbalance for robust floating ring termination." Microelectronics Reliability 51, no. 9-11 (2011): 1959–63. http://dx.doi.org/10.1016/j.microrel.2011.06.037.

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Lee, Donghyun, Youngcheol Kim, and Byungok Kim. "Stability Analysis of Floating Ring Bearing Supported Turbocharger." Journal of the Korean Society of Tribologists and Lubrication Engineers 31, no. 6 (2015): 302–7. http://dx.doi.org/10.9725/kstle.2015.31.6.302.

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Andrianov, Alexey I., and Aad J. Hermans. "Hydroelastic Behavior of a Floating Ring-Shaped Plate." Journal of Engineering Mathematics 54, no. 1 (2006): 31–48. http://dx.doi.org/10.1007/s10665-005-3536-4.

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48

Mahmood, Zaid H., Ihsan K. Irthiea, and Kadum A. Abed. "Experimental and Simulation investigations of Micro Flexible Deep Drawing Using Floating Ring Technique." Al-Khwarizmi Engineering Journal 14, no. 3 (2018): 20–31. http://dx.doi.org/10.22153/https://doi.org/10.22153/kej.2018.12.007.

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Micro metal forming has an application potential in different industrial fields. Flexible tool-assisted sheet metal forming at micro scale is among the forming techniques that have increasingly attracted wide attention of researchers. This forming process is a suitable technique for producing micro components because of its inexpensive process, high quality products and relatively high production rate. This study presents a novel micro deep drawing technique through using floating ring as an assistant die with flexible pad as a main die. The floating ring designed with specified geometry is lo

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49

Mahmood, Zaid H., Ihsan K. Irthiea, and Kadum A. Abed. "Experimental and Simulation investigations of Micro Flexible Deep Drawing Using Floating Ring Technique." Al-Khwarizmi Engineering Journal 14, no. 3 (2018): 20–31. http://dx.doi.org/10.22153/kej.2018.12.007.

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Abstract:

Micro metal forming has an application potential in different industrial fields. Flexible tool-assisted sheet metal forming at micro scale is among the forming techniques that have increasingly attracted wide attention of researchers. This forming process is a suitable technique for producing micro components because of its inexpensive process, high quality products and relatively high production rate. This study presents a novel micro deep drawing technique through using floating ring as an assistant die with flexible pad as a main die. The floating ring designed with specified geometry is lo

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50

Feklistov, P. A., N. M. Byzova, E. V. Sazanova, A. I. Pashkevich, and A. N. Sobolev. "Dendrochronological Studies of Wood at Historically Significant Sites of the Arctic." Lesnoy Zhurnal (Forestry Journal), no. 5 (November 5, 2020): 106–18. http://dx.doi.org/10.37482/0536-1036-2020-5-106-118.

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Studies of wood in the Arctic were carried out on Vaygach Island, Hooker Island (Franz Joseph Land) and Novaya Zemlya. During the expedition “Arctic Floating University – 2013”, wood samples (cores) were taken from the buildings in key areas of the Arctic islands. Conforming to the wood samples we constructed tree-ring series and obtained floating chronologies, which were linked to dendroscales of standing trees with known year of each annual ring formation. Crossdating of floating chronologies was performed as follows. Dendroscale and floating chronology were overlapped and the synchronicity

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