Bibliografie tematiche / Spherical air bearing

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Letteratura scientifica selezionata sul tema "Spherical air bearing"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 3 febbraio 2022

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Articoli di riviste sul tema "Spherical air bearing"

Masters, M. F., C. Reynolds, H. Suedhoff e F. M. DeArmond. "Construction of a simple spherical air bearing". American Journal of Physics 77, n. 8 (agosto 2009): 764–66. http://dx.doi.org/10.1119/1.3050161.

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Kok Kiong Tan, Sunan Huang, Wenyu Liang, A. A. Mamun, Eng Kiat Koh e Huixing Zhou. "Development of a Spherical Air Bearing Positioning System". IEEE Transactions on Industrial Electronics 59, n. 9 (settembre 2012): 3501–9. http://dx.doi.org/10.1109/tie.2011.2171179.

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Arun, Kumar S., A. Sekar e K. V. Govinda. "Aerostatic Spherical Bearing Manufacturing Methods and Criticalities - An Approach". Applied Mechanics and Materials 592-594 (luglio 2014): 28–32. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.28.

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In general, aerostatic bearings are flat bearings and the stringent manufacturing tolerances in geometric dimensions and profile will make the bearing ideal for obtaining high stiffness during measurement. Aerostatic Spherical Bearing (ASB) on the contrary is a special bearing which provides a frictionless pivot and allows three degrees of rotational freedom. Methods involved in manufacturing and realizing a highly stiff ASB is discussed in this paper. ASB components viz. Stator and Rotor of hemi-spherical in geometry are the critical components to be machined, which are used in Mass properties and Dynamic Balancing Measurement machine (MaPDBM). MaPDBM is used to measure mass, center of gravity, moments of inertia and static & dynamic unbalance of spacecraft. An air film of 25-50 μm thickness separates the stator and rotor during measurement, thus forming an aerostatic bearing. Precise Machining, Thermal treatments to ensure crash-proof design, Special processes like lapping for profile correction, Geometrical and profile measurements during different stages in the sequence for controlling the bearing parameters using Coordinate Measurement Machine (CMM) are the challenges involved in the machining and realization of the ASB components and the same is discussed in this paper.

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Vahdati, Mehrdad, E. Azimi e Ali Shokuhfar. "Air Characteristics in Air Turbine Spindle of Ultra Precision Machines". Defect and Diffusion Forum 297-301 (aprile 2010): 396–401. http://dx.doi.org/10.4028/www.scientific.net/ddf.297-301.396.

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Air Spindles have been used in ultra precision machines for several years due to their advantages such as high speed rotation, low friction, and low vibration, [1]. Air spindles are widely used in these machines for producing precise work pieces. Although, spindles function on a very complicated theoretical basis, [2, 3], their structure is very simple and consists of mainly a rotor and a stator. The rotor/stator could be made of different shapes. A cylindrical shape is the one commonly in use. The spindle designed in this work has a spherical configuration. It has been designed so that it could be moved without application of electric motor and only by a wind turbine system, [4]. The spindle studied in this research uses compressed air for rotor suspension, and has an air turbine for rotating its shaft. A thin air film acts as bearing layer between rotor and stator. In design procedure, operation parameters such as air inlet pressure for turbine, air inlet pressure for bearing, diameter of turbine nuzzles, diameter of bearing nuzzles, clearance between rotor and stator and etc. have been considered, [5]. A prototype spindle has been manufactured using design criteria. The influence of above mentioned parameters have been recognized through experiments.

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Lu, Jie, Zhihua Chen, Hongbo Liu e Zimei Guo. "Behavior of eccentrically loaded welded hollow spherical joints after elevated-temperature exposure". Advances in Structural Engineering 22, n. 6 (29 novembre 2018): 1352–67. http://dx.doi.org/10.1177/1369433218815432.

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Welded hollow spherical joint is an extremely widely used connection pattern in space lattice structures. Understanding the behavior of the welded hollow spherical joint after elevated-temperature exposure is critical for the fire damage assessment of the entire space lattice structures. In this study, both experimental and numerical studies were conducted to reveal the mechanical behavior of eccentrically loaded welded hollow spherical joints subjected to eccentric loads after cooling from three elevated temperatures up to 1000°C, wherein two different methods were considered, namely, air and water cooling. Associate mechanical performance, such as load versus longitudinal displacement and load versus steel tube rotation responses, initial stiffness, load-bearing capacities, and strain development, were obtained and further analyzed. The results showed that the behavior of welded hollow spherical joints began to change when the exposure temperatures exceeded 600°C, with obvious reductions in both stiffness and strength. In addition, the influences of different cooling methods were significant. The joints cooled by water generally presented higher load-bearing capacities than those cooled by air. Furthermore, three-dimensional finite element analysis was conducted via ABAQUS software. After validating the finite element model against experimental results, parametric studies were performed and a practical formula was proposed to calculate the load-bearing capacity of welded hollow spherical joints subjected to eccentric load after elevated-temperature exposure.

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Costa, Rômulo Fernandes, Osamu Saotome e Elvira Rafikova. "Simulation and Validation of Satellite Attitude Control Algorithms in a Spherical Air Bearing". Journal of Control, Automation and Electrical Systems 30, n. 5 (23 luglio 2019): 716–27. http://dx.doi.org/10.1007/s40313-019-00497-4.

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Zorge, R. A. "Measurements on a miniature spherical air bearing by using its electrical gap capacitance". Measurement 11, n. 2 (aprile 1993): 159–72. http://dx.doi.org/10.1016/0263-2241(93)90015-a.

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Lee, Kok-Meng, Dan E. Ezenekwe e Tian He. "Design and control of a spherical air-bearing system for multi-d.o.f. ball-joint-like actuators". Mechatronics 13, n. 2 (marzo 2003): 175–94. http://dx.doi.org/10.1016/s0957-4158(01)00037-x.

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Dynich, R. A., A. D. Zamkovets, A. N. Ponyavina e E. М. Shpilevsky. "Dependence of a surface plasmon resonance absorption band on the concentration of gold nanoparticles in carbon-bearing matrixes". Proceedings of the National Academy of Sciences of Belarus. Physics and Mathematics Series 55, n. 2 (28 giugno 2019): 232–41. http://dx.doi.org/10.29235/1561-2430-2019-55-2-232-241.

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For fullerene matrixes doped by gold nanoparticles we have established experimentally a miss of a red concentration-induced shift of surface plasmon resonance absorption band maximum. Theoretical modeling has been made for spectral characteristics of carbon–bearing nanostructures. Numerical calculations of extinction factors for a spherical metallic particle in an absorbing surrounding medium were based on the Mie theory. Transmission spectra coefficients of densely packed plasmonic nanoparticles monolayers were calculated with the use of the single coherent scattering approximation modified for absorbing matrices. Thin-film Au-air and Au–C60 nanostructures have been fabricated on glass and quartz substrates by thermal evaporation and condensation in vacuum at an air pressure of 2 · 10–3 Pа. The surface mass density of Au into Au–C60 nanostructures was varied in the range (3.86–7.98) · 10–6 g/cm2. The comparison of theoretical and experimental data allowed making a conclusion that the absorbency in carbon-bearing matrix leads to the attenuation of lateral electrodynamics coupling and blocks collective plasmon resonance in densely packed gold nanostructures.

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Gopinath, K., K. Raghavendra, M. K. Behera, E. V. Subba Rao, M. Umakanth e S. Gopinath. "Product Design Aspects for Design of Accurate Mass Properties Measurement System for Aerospace Vehicles". Applied Mechanics and Materials 110-116 (ottobre 2011): 4712–18. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.4712.

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Mass properties of aerospace vehicle viz Weight, Center of Gravity (Xcg, Ycg, Zcg) & Mass Moment of Inertia (Ixx, Iyy & Izz) are critical inertial parameters which are vital to meet the intended mission objectives. Accurate mass properties measurement is needed for fast maneuvering aerospace vehicles to meet the Control and Guidance requirements within the tolerable limits generated by the System Designer. Mass properties estimation is vital during the configuration design phase of an aerospace vehicle. Assumptions and Constraints during the configuration design, limits the accuracy of estimations making the mass properties measurement mandatory. The mass properties of the aerospace vehicle can be measured by numerous methods, but for achieving high accuracies within the tolerable limits, the measurement system should have advanced technologies and measurement methodologies. Based on the experience, mass properties measurement systems were designed using Load Cells and Cross-Flexural Pivots in two different systems (Weight and CG in System-1, MOI in System-2), which have limited accuracy and also involves tedious external measurements. Adopting Air-Bearing (T / H / Spherical shape) supported with accurate sensors using Inverted Torsion Pendulum method, Multiple Point Weighing method and a proper measurement methodology, enhances the accuracy of the measurement system. Usage of spherical bearing yields a better accurate system but has the difficulty in realization of the system indigenously, whereas use of T or H-shape bearing is a feasible solution for achieving the desired accurate mass properties specifications. This paper gives an insight into to the product design aspects to be considered for realization of accurate mass properties measurement system.

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Più fonti

Tesi sul tema "Spherical air bearing"

Ezenekwe, Dan Emeka. "Design methodology of an air bearing system for multi-DOF spherical actuator motion control applications". Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/17861.

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Capa, Enes. "Progettazione di un testbed per simulazioni dinamiche di controllo d’assetto di nanosatelliti con utilizzo di tecniche di stampa 3D". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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Abstract (sommario):

Nel campo dei satelliti e delle missioni spaziali è critico verificare sul suolo terrestre hardware e software, in quanto la manutenzione è impossibile successivamente alla messa in orbita. Per questo il funzionamento del satellite deve essere verificato in condizioni simili a quelle orbitali. Il sottosistema responsabile della determinazione e del controllo di assetto, attitude determination and control subsystem (ADCS), deve soddisfare diversi requisiti, dettati dalle specifiche del payload e di altri sottosistemi (es: ss di telecomunicazione, ss di potenza, ecc.). Il funzionamento e le performance dell’ADCS sono critiche per la riuscita delle missioni, pertanto il suo sviluppo e verifica risulta di primaria importanza. In questo elaborato di tesi viene descritto lo sviluppo di un testbed necessario a simulare un ambiente privo di attrito che permetta ad un sistema di controllo di assetto di operare su tre assi con rotazioni di 360ᴼ. Per fornire tre gradi di libertà viene utilizzato un cuscinetto sferico; in particolare si andrà a realizzare, mediante l’uso di stampa 3D, una sfera che fungerà da interfaccia tra il mockup del satellite integrato con un sistema di controllo d’assetto (in questo caso costituito da tre magnetorquers) e un cuscinetto d’aria in pressione generato all’interno di una calotta sferica di raggio uguale a quello della sfera stampata. Dato che la sfera realizzata deve soddisfare diversi requisiti, è stato necessario analizzare sia i materiali sia le tecniche di stampa che si andranno ad utilizzare. Per verificare le performance dell’accoppiamento sferico realizzato con la tecnologia 3D, è stato inoltre progettato un prototipo che ricalca la forma di un cuscinetto sferico COTS disponibile in laboratorio. Il prototipo risulta necessario per verificare in maniera affidabile la variazione di prestazione dovute all’impiego di componenti stampate in 3D.

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Capitoli di libri sul tema "Spherical air bearing"

da Costa, Rômulo Fernandes, Osamu Saotome e Elvira Rafikova. "Efficacy Comparison of Satellite Attitude Control Systems Using a Spherical Air Bearing". In Proceedings of the 4th Brazilian Technology Symposium (BTSym'18), 55–64. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-16053-1_6.

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Atti di convegni sul tema "Spherical air bearing"

Saidimanesh, Mahdi, Azin Shahiri e Ali Nikparto. "Simulation and Optimization of a Semi Spherical Air Bearing". In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-87334.

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It is important to test the attitude control systems on satellites before they are launched in space. Traditionally this has been done by dropping the satellite, and firing the thrusters before the satellite makes a soft landing in a net. This method only allows a few seconds of testing and does not lend itself to the measurement of pointing accuracy. A better method is to mount the satellite on a spherical air bearing. In this paper behavior of a semi spherical air bearing is studied and analyzed in various conditions. These bearings are used in different applications such as simulation of approximately frictionless condition which is the satellite’s situation in space. In this analysis FLUENT 6.3.26 is used to simulate the air bearing’s behavior. Simulation process is divided into 5 sections. These sections are accordingly 2dimensional with static boundary condition, 3dimensional and static, 2dimensional and dynamic and 3dimensional and dynamic boundary conditions. At last bearing’s function was optimized by changing some adjustable parameters which are important in controlling the bearings behavior such as air entering nozzles diameter and their number and location. Importance of this study is to simulate the behavior of the bearing in dynamic boundary condition using dynamic mesh. Eventually results of the simulation are compared to the actual test results and bearing behavior is analyzed. Finally best arrangement for achieving maximum normal load is studied.

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Ustrzycki, Tyler, Regina Lee e Hugh Chesser. "Spherical Air Bearing Attitude Control Simulator for Nanosatellites". In AIAA Modeling and Simulation Technologies Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2011. http://dx.doi.org/10.2514/6.2011-6272.

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Dimond, Timothy W., Amir A. Younan, Paul E. Allaire e John C. Nicholas. "Modal Frequency Response of a Four-Pad Tilting Pad Bearing With Spherical Pivots, Finite Pivot Stiffness and Different Pad Preloads". In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-23609.

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Tilting pad journal bearings (TPJBs) provide radial support for rotors in high-speed machinery. Since the tilting pads cannot support a moment about the pivot, self-excited cross-coupled forces due to fluid-structure interactions are greatly reduced or eliminated. However, the rotation of the tilting pads about the pivots introduces additional degrees of freedom into the system. When the flexibility of the pivot results in pivot stiffness that is comparable to the equivalent stiffness of the oil film, then pad translations as well as pad rotations have to be considered in the overall bearing frequency response. There is significant disagreement in the literature over the nature of the frequency response of TPJBs due to non-synchronous rotor perturbations. In this paper, a bearing model that explicitly considers pad translations and pad rotations is presented. This model is transformed to modal coordinates using state-space analysis to determine the natural frequencies and damping ratios for a four-pad tilting pad bearing. Experimental static and dynamic results were previously reported in the literature for the subject bearing. The bearing characteristics as tested are considered using a thermoelastohydrodynamic (TEHD) model. The subject bearing was reported as having an elliptical bearing bore and varying pad clearances for loaded and unloaded pads during the test. The TEHD analysis assumes a circular bearing bore, so the average bearing clearance was considered. Because of the ellipticity of the bearing bore, each pad has its own effective preload, which was considered in the analysis. The unloaded top pads have a leading edge taper. The loaded bottom pads have finned backs and secondary cooling oil flow. The bearing pad cooling features are considered by modeling equivalent convective coefficients for each pad back. The calculated bearing full stiffness and damping coefficients are also reduced non-synchronously to the eight stiffness and damping coefficients typically used in rotordynamic analyses and are expressed as bearing complex impedances referenced to shaft motion. Results of the modal analysis are compared to a two degree-of-freedom second-order model obtained via a frequency-domain system identification procedure. Theoretical calculations are compared to previously published experimental results for a four-pad tilting pad bearing. Comparisons to the previously published static and dynamic bearing characteristics are considered for model validation. Differences in natural frequencies and damping ratios resulting from the various models are compared, and the implications for rotordynamic analyses are considered.

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Ezenekwe, D. E., e Kok-Meng Lee. "Design of air bearing system for fine motion application of multi-DOF spherical actuators". In 1999 IEEE/ASME International Conference on Advanced Intelligent Mechatronics. IEEE, 1999. http://dx.doi.org/10.1109/aim.1999.803277.

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Dai, Min, Yuwei Zhang, Li Zeng, Zhida Zhu, Jin Sun e Fan Zhang. "Research on bearing characteristics of air gap flow-field for a maglev spherical motor". In 2018 4th International Conference on Control, Automation and Robotics (ICCAR). IEEE, 2018. http://dx.doi.org/10.1109/iccar.2018.8384688.

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Prinkey, Meghan. "CubeSat Attitude Control Testbed Design: Merritt 4-Coil per axis Helmholtz Cage and Spherical Air Bearing". In AIAA Guidance, Navigation, and Control (GNC) Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2013. http://dx.doi.org/10.2514/6.2013-4942.

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Wang, Cheng-Chi, Her-Terng Yau e Chao-Lin Kuo. "Bifurcation and Chaos Analysis of a Relative Short Spherical Air Bearing System via a Novel Hybrid Method". In 2009 International Workshop on Chaos-Fractals Theories and Applications (IWCFTA). IEEE, 2009. http://dx.doi.org/10.1109/iwcfta.2009.75.

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Harris, Joel, e Dara Childs. "Static Performance Characteristics and Rotordynamic Coefficients for a Four-Pad Ball-in-Socket Tilting Pad Journal Bearing". In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-50063.

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Static performance characteristics and rotordynamic coefficients were experimentally determined for a four-pad, spherical-seat, tilting-pad journal bearing in load-between-pad configuration. Measured static characteristics include journal static equilibrium position, estimated power loss, and trailing-edge pad temperatures. Rotordynamic coefficients were determined from curve fits of measured complex dynamic-stiffness coefficients as a functions of the excitation frequency. A frequency-independent [M]-[C]-[K] model did a good job of fitting the measurements. Test conditions included speeds from 4 to 12 krpm and unit loads from 0 to 1896 kPa (0 to 275 psi). The bearing uses cool inlet oil to decrease the pad operating temperatures and increase the bearing’s load and speed capacity. The bearing has a nominal diameter of 101.78 mm (4.0070 in). Measurements indicated significant bearing crush with a radial bearing clearance of 99.63 μm (3.92 mils) in the axis 45° counterclockwise from the loaded axis and 54.60 μm (2.15 mils) in the axis 45° clockwise from the loaded axis. The pad length is 101.60 mm (4.00 in), giving L/D = 1.00. The pad arc angle is 73°, and the pivot offset ratio is 65%. Testing was performed using a test rig described by Kaul [1], and rotordynamic coefficients were extracted using a procedure adapted from Childs and Hale [2]. A bulk-flow Navier-Stokes model was used for predictions, using adiabatic conditions for the fluid in the bearings. However, the model assumes constant nominal clearances at all pads, and an average clearance was used based on measured clearances. Measured static eccentricities and attitude angles were significantly lower than predicted. Attitude angles varied from 6° to 39° and decreased with load. Power loss was well-predicted, with a maximum value of 25 kW (34 hp). The maximum detected pad temperature was 71°C (160°C) while the temperature rise from inlet to exit was over-predicted by 8°C (14°F). Direct stiffness and damping coefficients were significantly over-predicted, but the addition of a simple pivot-stiffness in series with the measured stiffness and damping values vastly improved the agreement between theory and experiment. Direct added masses were negative to a higher degree for Myy (y load direction) at low speeds and increased with speed. With the exception of Myy at zero load, they became positive before reaching 8,000 rpm. Although significant cross-coupled stiffness terms were present, they always had the same sign, producing a whirl frequency ratio of zero and netting unconditional stability over all test conditions.

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San Andrés, Luis, Rachel Bolen, Jing Yang e Ryan McGowan. "Measurements of Static and Dynamic Load Performance of a 102 mm Carbon-Graphite Porous Surface Tilting-Pad Gas Journal Bearing". In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-59131.

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Abstract (sommario):

Abstract Aerostatic journal bearings with porous tilting pads enable shaft support with minute drag power losses. To date archival information on the static and dynamic load performance of this bearing type is scant. Thus, the paper presents measurements conducted with an air lubricated bearing with diameter d = 102 mm and comprising four tilting pads made of porous carbon-graphite, each with length L = 76 mm. Two nested Belleville washers resting on spherical pivots support each pad. At ambient temperature of ∼ 21°C, as the air supply pressure into the bearing pads increases, so does the bearing aerostatic specific load (F/(L·d)) that reaches 58% of the pressure difference, supply minus ambient. With an air supply pressure of 7.8 bar(a), the test bearing static stiffness KS = 13.1 MN/m, is independent of both shaft speed and static load. KS is just 63% of the washers’ stiffness KP = 20.6 MN/m (during loading). While operating with shaft speeds equal to 6 krpm and 9 krpm (150 Hz) and under specific loads to 115 kPa and 101 kPa respectively, dynamic load experiments with excitation frequencies up to 342 Hz show the test bearing supplied with air at 7.8 bar(a) has frequency independent stiffness (K) and damping (C) coefficients. For rotor speeds equaling 0, 6 and 9 krpm, the bearing direct stiffnesses KXX ∼ KYY range from 13.6 MN/m to 32.7 MN/m as the specific load increases from 0 kPa to 115 kPa. The direct damping coefficients CXX ∼ CYY are as large as 5.8 kN·s/m, though having a large experimental uncertainty. Bearing cross-coupled force coefficients are insignificant. The test porous gas bearing reached its intended load capacity, demonstrated a dynamically stable operation and produced force coefficients mainly affected by the pads’ pivot supports and the magnitude of air supply pressurization.

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Wang, Fusheng, e Gang Bao. "Analysis on the Static Characteristics of the New Type Externally Pressurized Spherical Air Bearings". In ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30248.

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The new type externally pressurized spherical air bearings used mass properties measuring instruments are studied which are particularly recommended for determining mass properties of rockets, satellites and ballistic objects. The air bearings are the key component of the mass properties measuring instruments. In order to provide some theoretical guideline for the structure design of the new type externally pressurized spherical air bearings, this paper analyzes static characteristics and the factors affecting the static characteristics of the new type air bearings. A finite volume method is adopted to discretize the three-dimensional steady-state compressible Navier-Stokes equations, and a modified SIMPLE algorithm for compressible fluid is applied to solve the discretized governing equations. The pressure field and velocity field of the air bearings are obtained, from which the carrying capacity, static stiffness and mass flow of the air bearings can be derived, and the factors and rules affecting the static characteristics are analyzed. The calculation method proposed in this paper fits well the general principle, which can be extended to the characteristics analysis of other air bearings.

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