Статті в журналах: "Hydrostatical support"

1

Mao, Jun, Shuang Liu, and Zhen Ni Zu. "Study on the Hydrostatic Support of Internal Gear Pumps Based on FLUENT." Applied Mechanics and Materials 127 (October 2011): 516–21. http://dx.doi.org/10.4028/www.scientific.net/amm.127.516.

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A kind of hydrostatic support method was developed based on the analysis of the failure of internal gear pumps’ agglutination in this paper. The changing cycle of pressure on the internal gear was analyzed, and the grid model was built. The distribution of pressure on the inner wall of internal gear in different positions was simulated as well as the direction and magnitude by the FLUENT software. The angle range of the hydrostatic support’s channel on the inner wall of pump body was determined according to the above analysis and the force generated after making hydrostatic support’s channel was compared with the one of no hydrostatic support’s channel. The result of the numerical simulation and prototype experiment shows that the agglutination failure of inner mesh gear pumps can be avoided by hydrostatic support method.

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2

Taylor, J. R. A. "Switching Skeletons: Hydrostatic Support in Molting Crabs." Science 301, no. 5630 (July 11, 2003): 209–10. http://dx.doi.org/10.1126/science.1085987.

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3

Eckert, D., V. Ghirardini, S. Ettori, E. Rasia, V. Biffi, E. Pointecouteau, M. Rossetti, et al. "Non-thermal pressure support in X-COP galaxy clusters." Astronomy & Astrophysics 621 (January 2019): A40. http://dx.doi.org/10.1051/0004-6361/201833324.

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Galaxy clusters are the endpoints of structure formation and are continuously growing through the merging and accretion of smaller structures. Numerical simulations predict that a fraction of their energy content is not yet thermalized, mainly in the form of kinetic motions (turbulence, bulk motions). Measuring the level of non-thermal pressure support is necessary to understand the processes leading to the virialization of the gas within the potential well of the main halo and to calibrate the biases in hydrostatic mass estimates. We present high-quality measurements of hydrostatic masses and intracluster gas fraction out to the virial radius for a sample of 13 nearby clusters with available XMM-Newton and Planck data. We compare our hydrostatic gas fractions with the expected universal gas fraction to constrain the level of non-thermal pressure support. We find that hydrostatic masses require little correction and infer a median non-thermal pressure fraction of ∼6% and ∼10% at R500 and R200, respectively. Our values are lower than the expectations of hydrodynamical simulations, possibly implying a faster thermalization of the gas. If instead we use the mass calibration adopted by the Planck team, we find that the gas fraction of massive local systems implies a mass bias 1 − b = 0.85 ± 0.05 for Sunyaev–Zeldovich-derived masses, with some evidence for a mass-dependent bias. Conversely, the high bias required to match Planck cosmic microwave background and cluster count cosmology is excluded by the data at high significance, unless the most massive halos are missing a substantial fraction of their baryons.

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4

van Parijs, Vincent, Joep Nijssen, and Ron van Ostayen. "Whiffletree based supports for self-adjustable hydrostatic bearings." Advances in Mechanical Engineering 13, no. 12 (December 2021): 168781402110555. http://dx.doi.org/10.1177/16878140211055573.

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Hydrostatic bearings are superior in terms of their friction and load carrying characteristics when compared to contact based bearings, but non-usable in applications with non-constant curvature counter surfaces. A possible solution to this limitation is the introduction of deformable hydrostatic bearings components that cope with these required deformations. To reduce the required deformation of a single bearing pad, multiple pads can be connected through a so-called whiffletree support system. In this work, a symmetric whiffletree based hydrostatic bearing embodiment is introduced. A 2D quasi-static model is introduced that allows for determining the kinetostatic and path following properties of such a type of bearing. Design considerations are given regarding the joint rotational-, normal-, and shear stiffness of each individual joint, as well as basic bearing layout. The potential of a whiffletree suspended bearing is presented through the use of a case study.

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5

Strok, L. V., V. S. Sekatsky, N. V. Merzlikina, Yu A. Pikalov, and I. A. Kaposhko. "Hydrostatic supports in test and measuring equipment." IOP Conference Series: Materials Science and Engineering 862 (May 28, 2020): 032110. http://dx.doi.org/10.1088/1757-899x/862/3/032110.

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6

Lawry, J. "A Hydrostatic Michell Framework Supports Frog Lungs." Bulletin of Mathematical Biology 61, no. 4 (July 1999): 683–99. http://dx.doi.org/10.1006/bulm.1999.0104.

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7

Song, Yan Ming, and Yang Yang. "Hydrostatic Support Design of Cooling Copper Roller with Inner Pressure Feedback in Forming Amorphous Ribbon." Applied Mechanics and Materials 364 (August 2013): 46–51. http://dx.doi.org/10.4028/www.scientific.net/amm.364.46.

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Cooling copper roller is the key technology and equipment to amorphous ribbon forming. Rolling bearing support is difficult to obtain high rotation accuracy. A new inner pressure feedback hydrostatic journal bearing is proposed with different recess area. The load capacity and film stiffness mathematical model of hydrostatic journal bearing are established. The Inner pressure feedback hydrostatic journal bearing with different recess area at the diameter of 200mm is designed and manufactured for amorphous ribbon cooling copper roller support structure. The operation tests demonstrate that the rotation accuracy of the cooling copper roller shaft is less than 2μm, which in accordance with the requirements of amorphous ribbon production process.

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8

Morrissey, George R., and Michael C. Stone. "Diving Support Vessel Concept Design." Marine Technology and SNAME News 34, no. 02 (April 1, 1997): 148–55. http://dx.doi.org/10.5957/mt1.1997.34.2.148.

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This paper describes the preliminary process for designing a 250 ft dynamically positioned, Diving Support Vessel. This is to serve the offshore oil industry as a platform for underwater intervention. Enlisting the use of the latest technological advances, the vessel will support both remotely operated vehicles and human divers. We will trace the development of this design with a well-defined agenda. Beginning with an analysis of the existing fleet, a practical hull form is created, which leads to solid estimations for hydrostatics, stability, resistance, powering and preliminary arrangements. We will also discuss the steps that will follow over the next several months.

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9

Palash, A., V. Piddubny, and L. Golovkinа. "Technical support of aerobic fermentation processes." Technological Complexes 16 (December 5, 2019): 21–30. http://dx.doi.org/10.36910/2312-0584-16-2019-002.

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The article shows that aerobic fermentation of sugar-containing media requires the presence of dissolved oxygen in them. In most cases, the latter condition is fulfilled by the introduction and dispersion in the liquid phase of the air, which is compressed to levels corresponding to hydrostatic pressures with some exaggeration. The formation of the dispersed gas phase is accompanied by the interaction of the inlet air and the liquid phase, the efficiency of which is determined by the formed contact surface. The study presents generalizations that relate to the dynamics of biomass growth and correlate with the amount of oxygen introduced into the system. It is important that oxygen refers to gases with limited solubility, and therefore the hydrodynamic state and the interfacial surface are among the factors of intensification of mass transfer processes. It is also shown that the nominal estimation of the hydrodynamic state of gas-liquid media should begin with an assessment of the aeration intensity and it is proposed to take the reduced gas phase velocity as the ratio of the volume air flow to the cross-sectional area of the apparatus. Turning to the indicator of the reduced speed negates the influence of geometrical parameters in the form of the ratio of height and diameter. The results of the process and the efficiency of the equipment used are determined by the performance indicators in the form of concentrations of microorganisms and the output rate of the input power supply. The combination of these requirements leads to the need to combine the maximum achievable concentrations of dissolved oxygen and the minimum concentrations of sugars. The features of the double influence of ambient temperatures in the manifestations of the optimal for microorganisms and for the solubility of gases in accordance with Henry's law are shown, the values of Henry constants are given. The list of factors of influence includes such physical parameters of the environment as viscosity, surface tension, osmotic pressure, hydrostatic pressure, temperature. It is determined that the presence of dissolved nitrogen has an influence on the hydrodynamics of gas-liquid media due to changes in hydrostatic pressure in the circulation circuits.

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10

Han, Gui Hua, Ya Ping Wang, Yan Chun Zhong, Jun Peng Shao, Xiao Dong Yu, and Yan Qin Zhang. "Hardware-in-Loop Simulation on Hydrostatic Journal Support Pose." Applied Mechanics and Materials 44-47 (December 2010): 697–701. http://dx.doi.org/10.4028/www.scientific.net/amm.44-47.697.

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A scheme of improving performance of hydrostatic journal support was presented, that is, control journal support pose by controlling flow of four controllable chambers and Coupling various oil film thickness, to assure journal support expected pose; Chamber flow can be regulated by electro hydraulic servo valve-control variable pump according to the surface roughness, load, cutting force, and thermal results of journal support. The mathematical model of the controllable chambers flow, servo variable mechanism and controller were built; the pose control model was established, which contain the kinematics positive and negative solution and control strategy of hydraulic cylinder position feedback; Hardware-in-loop simulation experiment was carried on the electro hydraulic servo test bench by mean of the non-linear relation of film thickness and the hydraulic cylinder displacement. Simulation and Hardware-in-loop simulation experiment results show that the controllable journal support exhibit high oil film rigidity can stably and quickly track the expected goal and can be broadly applied in high precision heavy horizontal machine tool.

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11

Kim, Dong Sung (Danny), and Bruce L. Tai. "Hydrostatic support-free fabrication of three-dimensional soft structures." Journal of Manufacturing Processes 24 (October 2016): 391–96. http://dx.doi.org/10.1016/j.jmapro.2016.06.018.

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12

Vasil'ev, A. "DEVELOPMENT OF A METHODOLOGY FOR CALCULATING THE PRESSURE DEVELOPMENT OF A METHOD FOR CALCULATING THE PRESSURE FIELD FOR THE NONISOTHERMAL FLOW OF A VISCOUS LIQUID IN GYROSTATIC BEARINGS WHEN PROCESSING LARGE-SIZED STEAM TURBINE SHAFTS." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 6, no. 7 (July 10, 2021): 99–106. http://dx.doi.org/10.34031/2071-7318-2021-6-7-99-106.

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A mathematical model for calculating the pressure field of a hydrostatic support with an incomplete girth angle for a non-isothermal flow of a viscous working fluid using the iteration method is developed. The fundamental laws of hydrodynamics and the hydrodynamic theory of lubrication are used. The pressure field is calculated by jointly solving the Reynolds equation, the energy balance equation and the flow rate balance equation, as well as additional relationships for the thermophysical parameters of the working fluid, obtained by approximating the tabular values. The mathematical model of the pressure field takes into account all the characteristics and operating parameters of the hydrostatic support with an incomplete range angle, by setting the boundary conditions and geometric parameters of the working surface of the support liner. The developed system is solved by the numerical method of finite differences. A comparative analysis of the static characteristics of different designs of a hydrostatic support with an incomplete range angle is carried out. Recommendations are given on the choice of the number of pockets in the design of liners for a hydrostatic support with an incomplete range angle to ensure guaranteed floatation and maintain a given value of the working clearance in the fluid friction zone of the shaft journal and the bearing surface of the hydrostatic support liner when turning shafts of steam turbine.

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13

Broadwater, John D., Sean M. Kery, Michael Eaton, Gerry Hanley, Shawn Henderson, Jeff Johnston, David Krop, Eric Nordgren, Caitlin Quigley, and Torgeir Vada. "A Forensic Investigation of the Sinking of USS Monitor Using Modern Naval Architecture Tools and Technologies." Marine Technology Society Journal 46, no. 6 (November 1, 2012): 16–37. http://dx.doi.org/10.4031/mtsj.46.6.5.

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AbstractThe Union ironclad warship USS Monitor foundered in heavy seas off Cape Hatteras, North Carolina, on December 31, 1862. This paper focuses on the development and validation of numerical models of a ship foundering using USS Monitor as a test subject. It begins with a brief account of the vessel’s history and the circumstances leading up to the sinking, then presents the best estimate available for the vessel’s loading condition and hydrostatics. The ingress of water into the ship at a number of locations was described by the survivors, some of whom speculated that the upper and lower hulls began to separate forward due to repeated impact with waves. However, the degraded condition of the wreckage after 149 years on the seafloor prevented an examination of that portion of the hull. Several linear and nonlinear seakeeping models were run on this hull form, including both under tow and after the anchor was dropped just prior to the sinking. The seakeeping models provide time histories of hydrostatic head at each of the down flooding locations along with estimates of the slamming of the overhanging bow in moderate to large waves as reported in survivor testimony. The numerical tools developed to support this analysis will be able to support the analysis of other vessel-foundering events.

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14

Beisembetov, Iskander, Sabyi Ussupov, Bakhyt Absadykov, Beken Arymbekov, and Birzhan Bektibay. "Studying Systems of Stabilization of Supports in Hydrostatic Machine Tool." Advanced Materials Research 622-623 (December 2012): 489–93. http://dx.doi.org/10.4028/www.scientific.net/amr.622-623.489.

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Development relevance to improve the operational parameters of the support units of machine tools in their design elements is introduced that increase the rigidity of the components, their carrying capacity, damp occurring vibrations in the process, the coefficient of performance (COP), smoothness of motion, positioning accuracy, reducing the wear of their working surfaces and maintain the original accuracy. A number of engineering development [1], [2], aimed at improving the above characteristics of the machine by changing and improving design of reference nodes used in these rails rolling bearings, aerostatic and hydrostatic guides, as well as the use of automatic control systems of its basic parameters, determine its quality. However, in some operating conditions in which errors occur, mainly due to the instability of oil-film thickness (gap) between the mobile and immobile elements of the hydrostatic bearing. For high accuracy requirements it will negatively affect the quality of machined parts and equipment performance. On this basis, it becomes apparent urgency of the problem of automatic stabilization of oil-film thickness (gap) in the IR. To ensure high precision equipment to improve power system hydrostatic bearing units of machine tools. This, in turn, creates the prerequisite for the development of stabilization systems of the gap in the hydrostatic bearing, with the help of which the thickness of oil layer in them would be kept constant even with significant dynamic load on the support.

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15

Krasnovsky, Andrey A., and Viktor M. Seryakov. "EFFECT OF ORIGINAL STRESS STATE OF THE ROCK MASS ON DISTRIBUTION OF DISPLACEMENTS AND STRESSES IN THE VICINITY OF SUPPORTED MINE WORKING IN UNSTABLE ROCKS." Interexpo GEO-Siberia 2 (July 8, 2020): 82–88. http://dx.doi.org/10.33764/2618-981x-2020-2-82-88.

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The statement of the problem of finding the stress-strain state of support and rocks surrounding the mine working in case of cushioning with phenol resins is used to determine the peculiarities of its formation under the influence of gravitational and hydrostatic original stress fields. It is found that maximum vertical compressive stresses arise in vertical support units at gravitational field, which exceed by half their values for a hydrostatic field. However, as the height in the mine roof filled with phenol resins increases, maximum vertical stresses for both options become comparable. In arch support units at hydrostatic original state of the rock mass, the values of horizontal tensile stresses are by half less than at gravitational original field.

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16

Wang, Yumo, Zhifeng Liu, Ligang Cai, and Qiang Cheng. "Modeling and optimization of nonlinear support stiffness of hydrostatic ram under the impact of cutting force." Industrial Lubrication and Tribology 70, no. 2 (March 12, 2018): 316–24. http://dx.doi.org/10.1108/ilt-11-2016-0285.

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Purpose This paper aims to study the nonlinear supporting performance of hydrostatic ram under the impact of cutting force and search for an optimal solution to improve its stiffness. Design/methodology/approach The Reynolds equation was applied to resolve the carrying capability of a single oil pad numerically, and an iteration method was used to analyze the nonlinear supporting force and stiffness of a pair of oil pads placed face-to-face. The total offset of ram could be obtained after the displacement of aspectant oil pads was solved by the bisection method. From the comparison of the offset values of ram evaluated under different support conditions, the optimal solution was determined. Findings In this study, an optimized oil supply allocation, concluded as 1.16:0.84, is proposed to improve the performance of hydrostatic ram supporting structure. Originality/value The supporting performance of hydrostatic ram could be improved by appropriate allocation of oil supply without extra energy consumption.

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17

He, Qiang, Weifeng Huang, Ying Liu, Xiangfeng Liu, Yongjian Li, and Yuming Wang. "Contact status between seal ring and its support: crucial factor in hydrostatic mechanical face seal." Industrial Lubrication and Tribology 71, no. 7 (September 9, 2019): 885–92. http://dx.doi.org/10.1108/ilt-04-2018-0138.

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Purpose This paper aims to investigate the influence of the contact status between the seal ring and its support on the seal performance in hydrostatic mechanical face seal. Design/methodology/approach A thermal fluid-solid interaction (TFSI) model of hydrostatic mechanical face seal is further developed, in which the multi-body contacts between components are particularly given more attention. The numerical models of the flow field and complete seal assemblies are developed. A specific energy equation is obtained to simplify the calculation of film temperature. Based on the mechanism for the continuity condition of the physical quantities at the fluid–solid interface, the TFSI model uses an on-line iterative coupling method. Findings The contact status between seal ring and its support affects the seal performance significantly. The rotating ring and the stationary ring contribute differently because of the contact status difference. Originality/value The contact status between the seal ring and the ring seat is key to gain an insight into the performance of the hydrostatic mechanical face seal thus provides guidance for mechanical seal design.

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18

UCHIDA, Keiichiro, Kenji SUZUKI, and Eizo URATA. "Influence of roundness on hydrostatic support of water hydraulic valves." Proceedings of Conference of Chugoku-Shikoku Branch 2004.42 (2004): 133–34. http://dx.doi.org/10.1299/jsmecs.2004.42.133.

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19

Strok, L. V., V. S. Sekatskii, Ya Yu Pikalov, and V. A. Kodnyanko. "Effect of Roughness Directed Radially on the Hydrostatic Support Characteristics." Journal of Machinery Manufacture and Reliability 49, no. 12 (December 2020): 1021–26. http://dx.doi.org/10.3103/s1052618820120146.

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20

Wang, Hui, and Yu Xin Wang. "Effect of Secondary Force on Rigidity of Oil Film of the Slipper Pair Based on Hydrostatic Support." Advanced Materials Research 468-471 (February 2012): 1380–83. http://dx.doi.org/10.4028/www.scientific.net/amr.468-471.1380.

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Rigidity of oil film is an important hydrostatic support performance of the slipper pair. This paper establishes the mathematics model of hydrostatic support structure on the basis of considering secondary force. And establish the simulation model of rigidity of oil film by using the toolbox of Simulink. Study the dynamic characteristics of rigidity of oil film under the influence of secondary force through computer simulation. And reach a conclusion that the impact of secondary force on rigidity of oil film has a relationship with friction coefficient and work pressure.

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21

Wang, Shi Gang, Xian Feng Du, Dong Sheng Li, and Qing Ming Hu. "Characteristic Study on Temperature Field of Hydrostatic Bearing of Hydroforming Machine." Advanced Materials Research 605-607 (December 2012): 630–35. http://dx.doi.org/10.4028/www.scientific.net/amr.605-607.630.

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Temperature field of hydrostatic bearing of hydroforming machine is studied in this paper,SOLIDWORKS2009 is used to model the simulational modeling of hydrostatic bearing of hydroforming machine, and then experiments based on hydroforming machine is conducted by using the finite element software FLUENT6.3 and GAMBIT, with the simulational results that the temperature field of hydrostatic bearing. Finally, the relationship between temperature field and angle-velocity is concluded by analyzing the simulational experiments results. The simulational results provide theoretical support and effective conference for the optimized layout of the heat transfer of hydrostatic bearing with heat transfer, which will reduce the experimental costs and the development time of the hydrostatic bearing.

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22

Sakhno, Evgeny, Sergey Ponomarenko, and Kateryna Korniets. "DESIGN OF NEW AUTOMATED POWER SYSTEM OF HYDROSTATIC SUPPORTS." TECHNICAL SCIENCES AND TECHNOLOG IES, no. 2(8) (2017): 49–56. http://dx.doi.org/10.25140/2411-5363-2017-2(8)-49-56.

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23

SUZUKI, Kenji, and Eizo URATA. "EXPERIMENTAL STUDY ON HYDROSTATIC SUPPORTS OF WATER HYDRAULIC VALVES." Proceedings of the JFPS International Symposium on Fluid Power 2002, no. 5-1 (2002): 177–80. http://dx.doi.org/10.5739/isfp.2002.177.

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24

Chae, Jong-Chul. "NON-HYDROSTATIC SUPPORT OF PLASMA IN THE SOLAR CHROMOSPHERE AND CORONA." Journal of The Korean Astronomical Society 43, no. 3 (June 30, 2010): 55–64. http://dx.doi.org/10.5303/jkas.2010.43.3.055.

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25

Angelinelli, M., F. Vazza, C. Giocoli, S. Ettori, T. W. Jones, G. Brunetti, M. Brüggen, and D. Eckert. "Turbulent pressure support and hydrostatic mass bias in the intracluster medium." Monthly Notices of the Royal Astronomical Society 495, no. 1 (April 13, 2020): 864–85. http://dx.doi.org/10.1093/mnras/staa975.

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ABSTRACT The degree of turbulent pressure support by residual gas motions in galaxy clusters is not well known. Mass modelling of combined X-ray and Sunyaev–Zel’dovich observations provides an estimate of turbulent pressure support in the outer regions of several galaxy clusters. Here, we test two different filtering techniques to disentangle bulk from turbulent motions in non-radiative high-resolution cosmological simulations of galaxy clusters using the cosmological hydrocode enzo. We find that the radial behaviour of the ratio of non-thermal pressure to total gas pressure as a function of cluster-centric distance can be described by a simple polynomial function. The typical non-thermal pressure support in the centre of clusters is ∼5 per cent, increasing to ∼15 per cent in the outskirts, in line with the pressure excess found in recent X-ray observations. While the complex dynamics of the intracluster medium makes it impossible to reconstruct a simple correlation between turbulent motions and hydrostatic bias, we find that a relation between them can be established using the median properties of a sample of objects. Moreover, we estimate the contribution of radial accelerations to the non-thermal pressure support and conclude that it decreases moving outwards from 40 per cent (in the core) to 15 per cent (in the cluster’s outskirts). Adding this contribution to one provided by turbulence, we show that it might account for the entire observed hydrostatic bias in the innermost regions of the clusters, and for less than 80 per cent of it at r > 0.8 r200,m.

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26

Ye, Hong Ling, Pin Wen, and Xiao Long Zheng. "Dynamic Analysis and Multiparameters Optimization of Hydrostatic Supported Worktable System." Advanced Materials Research 562-564 (August 2012): 1155–58. http://dx.doi.org/10.4028/www.scientific.net/amr.562-564.1155.

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The natural frequency at lower orders for hydrostatic supported worktable system may easily give rise to vibration as in resonance with excitation frequency. This paper is concerned with the geometrical optimum design and dynamic modal analysis for system with hydrostatic oil fluid and worktable simultaneously. The variations of eigenfrequency, respect to oil film thickness, outer radius of worktable, recess shape and number, were discussed. The results show that, under linear increment/decrement of geometry dimension, frequency increase/decrease but in nonlinear regularity. Therefore there exists an optimum dimension resulting the optimum frequency that deviate from the rotary frequency at work and its multiple ones. Then two-phase optimization strategy was effectively programmed to get involved with finite element analysis software. It is theoretically critical to get the optimum parameter of hydrostatic supported worktable on how and practically important to guide the design in engineering.

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27

Lissauer, Jack J., Scott J. Wolk, Caitlin A. Griffith, and Dana E. Backman. "The epsilon Aurigae Secondary: A Hydrostatically Supported Disk." Astrophysical Journal 465 (July 1996): 371. http://dx.doi.org/10.1086/177426.

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28

Tatsienko, Victor, Vyacheslav Gogolin, Inna Ermakova, and Alexander Liskovets. "Justification of the Calculation Method for Arch Support with Rock Grouting." E3S Web of Conferences 105 (2019): 01026. http://dx.doi.org/10.1051/e3sconf/201910501026.

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This paper proposes a new method for calculating arch support with grouted space behind the support. The analysis of existing installations and methods for the calculation of frame supports was made. It has been established that the existing methods of frame parts calculation do not take into account the presence of grouted space behind the support. It is proposed to take into account the presence of the grouted layer in the space behind the support when it interacts with the rock mass. The formation of partially disturbed rock adjacent to the grouted layer is taken into account in the behaviour of rocks. In this method, the arch support is replaced with a ring support. The finite element method establishes the reduced dimensions of the ring support and its module of linear deformations, corresponding to these values of the arch support when its bearing capacity is lost. The scheme for calculating arch support ultimately boils down to considering the interaction of the support, the grouted layer, the zone of partially destroyed rocks and the rest of the mass of intact rocks in the hydrostatic field of rock pressure.

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29

Nowak, Benedikt, Michael Paulus, Julia Nase, Paul Salmen, Patrick Degen, Florian J. Wirkert, Veijo Honkimäki, and Metin Tolan. "Solid-Supported Lipid Multilayers under High Hydrostatic Pressure." Langmuir 32, no. 11 (March 8, 2016): 2638–43. http://dx.doi.org/10.1021/acs.langmuir.5b04554.

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30

Kazimirova, E. G., V. V. Shiryaev, P. V. Lyskin, G. V. Stepanov, and E. Yu Kramarenko. "Silicone Oil Tamponade Hydrostatics and Technology for Additional Mechanical Support of Retina." Sovremennye tehnologii v medicine 10, no. 4 (December 2018): 15. http://dx.doi.org/10.17691/stm2018.10.4.02.

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31

Amin, Ahmed. "Piezoresistivity in ruthenium-based metal–insulator– metal structures." Journal of Materials Research 16, no. 8 (August 2001): 2239–43. http://dx.doi.org/10.1557/jmr.2001.0307.

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The resistance change with applied stress was measured for ruthenium-based metal–insulator–metal thick films under tensile and hydrostatic pressures over the temperature range −25 to +135 °C. The derived longitudinal, transverse, and hydrostatic piezoresistivity coefficients were corrected for elastic effects to yield the corresponding piezoresistivity coefficients and their temperature dependencies. The results clearly demonstrate for the first time a hydrostatic piezoresistivity coefficient that is sevenfold larger than the longitudinal component. Symmetry analysis is used to explain this phenomenon and to deduce additional piezoresistivity matrix elements and their degeneracy. In addition, pressure effects on electrical transport support a tunneling mechanism.

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32

Zhang, Xiumin, Mingfu Yin, and Huilai Sun. "Analysis and simulation of straight-through labyrinth seal in hydrostatic support system." Industrial Lubrication and Tribology 71, no. 5 (July 8, 2019): 692–96. http://dx.doi.org/10.1108/ilt-01-2019-0007.

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PurposeThe purpose of this paper is to improve the bearing capacity and mechanical properties of the oil pocket.Design/methodology/approachIn this paper, a straight-through labyrinth seal is installed in an oil sealing belt. The main structure of hydrostatic support system (HSS) is introduced, and the factors affecting the leakage loss are analyzed. The governing equations involving the momentum equation and the continuity equation for the land section and groove section are established separately based on the three-control-volume theory. To explain the flow capability of the straight-through labyrinth seal, the labyrinth seal with different clearance widths, groove numbers, groove depths and pressure difference is calculated. The results of the simulation are compared and analyzed.FindingsThe groove dimensions and groove numbers have important impact on the leakage and flow pattern of the seal.Research limitations/implicationsThe fluid flow was simulated by commercial tools executed in the ANSYS Fluent, the computational fluid dynamics (CFD) solver and a steady state scheme with the realizable k-ε turbulence model was applied. The cavity structure of the straight-through labyrinth seal, forming turbulence eddy flows in the groove, which is a valid approach to convert turbulence kinetic energy into thermal energy, reduce leakage mass flow.Practical implicationsThis research can provide the theoretical basis and technical support which is conducive to the practical application of the straight-through labyrinth seal in HSS.Social implicationsA new design structure is proposed to improve the bearing capacity and economic benefit of HSSs.Originality/valueA straight-through labyrinth seal is applied to the oil sealing belt and the three-control-volume governing equation is established.

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33

ISE, Tomohiko, Hiroshi MIYATAKE, and Toshihiko ASAMI. "Asymmetric Supply Type Hydrostatic Journal Gas Bearings to Support Large Load Rotors." Journal of Advanced Mechanical Design, Systems, and Manufacturing 6, no. 1 (2012): 149–57. http://dx.doi.org/10.1299/jamdsm.6.149.

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34

Benadda, Mohamed, Ahmed Bouzidane, Marc Thomas, and Raynald Guilbault. "Dynamic behavior analysis of a rigid rotor supported by hydrostatic squeeze film dampers compensated with new electrorheological valve restrictors." Industrial Lubrication and Tribology 72, no. 5 (November 4, 2019): 611–19. http://dx.doi.org/10.1108/ilt-06-2019-0226.

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Purpose This paper aims to propose a new hydrostatic squeeze film damper compensated with electrorheological valve restrictors to control the nonlinear dynamic behavior of a rigid rotor caused by high unbalance eccentricity ratio. To investigate the effect of electrorheological valve restrictors on the dynamic behavior of a rigid rotor, a nonlinear model is developed and presented. Design/methodology/approach The nonlinear results are compared with those obtained from a linear approach. The results show good agreement between the linear and nonlinear methods when the unbalanced force is small. The effects of unbalance eccentricity ratio and electric field on the vibration response and the bearing transmitted force are investigated using the nonlinear models. Findings The results of simulation performed that the harmonics generated by high unbalance eccentricities can be reduced by using hydrostatic squeeze film damper compensated with electrorheological valve restrictors. Originality/value The numerical results demonstrate that this type of smart hydrostatic squeeze film damper provides to hydrostatic designers a new bearing configuration suitable to control rotor vibrations and bearing transmitted forces, especially for high speed.

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35

Nishitani, Yuki, Shigeka Yoshimoto, and Kei Somaya. "Numerical Investigation of Static and Dynamic Characteristics of Water Hydrostatic Porous Thrust Bearings." International Journal of Automation Technology 5, no. 6 (November 5, 2011): 773–79. http://dx.doi.org/10.20965/ijat.2011.p0773.

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A moving table supported by aerostatic bearings can achieve excellent accuracy of motion because of its noncontact support and, hence, it is used in various precision machine tools and measuring equipment. However, because of low viscosity of air, the damping coefficient of aerostatic bearings is not very high, causing vibration with nanometer-order amplitudes. The accuracy of machine tools and measuring equipment could deteriorate because of this vibration. It is expected that water hydrostatic bearings would have a higher damping coefficient than aerostatic bearings due to the higher viscosity of water. In addition, water, like air, does not pollute the environment. In this paper, the static and dynamic characteristics of water hydrostatic thrust bearings using porous material were numerically investigated and comparedwith conventional pocket hydrostatic bearings with a capillary restrictor. Hydrostatic porous bearings can be easily constructed because the porous material becomes a viscous restrictor itself. It was consequently found that water hydrostatic porous thrust bearings have higher maximum load capacity and slightly lower stiffness than water bearings with a capillary restrictor.

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36

Minchin, PEH, and MR Thorpe. "Is Phloem Transport Due to a Hydrostatic Pressure Gradient? Supporting Evidence From Pressure Chamber Experiments." Functional Plant Biology 14, no. 4 (1987): 397. http://dx.doi.org/10.1071/pp9870397.

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A pressure chamber was used to increase suddenly the hydrostatic pressure in the upper shoot of a Phaseolus vulgaris plant while observing phloem transport of 11C-labelled photoassimilate. Phloem transport in the stem towards the chamber stopped immediately when pressure was applied and then recovered within about 5 min. If the pressure was then released, flow increased again. The results support the hypothesis that flow of photoassimilate in the stem phloem was driven by a hydrostatic pressure gradient.

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37

van Beek, A., and A. Segal. "Rubber supported hydrostatic thrust bearings with rigid bearing surfaces." Tribology International 30, no. 1 (January 1997): 47–52. http://dx.doi.org/10.1016/0301-679x(96)00021-7.

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38

Thiagarajan, Krish P. "Hydrostatic Stability of Compartmented Structures Supported by Air Cushions." Journal of Ship Research 53, no. 03 (September 1, 2009): 151–58. http://dx.doi.org/10.5957/jsr.2009.53.3.151.

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This paper presents theoretical formulations to evaluate the restoring moment of structures supported by air cushions at zero forward speed. The air cushion is assumed to be enclosed within a number of compartments that are open to sea. The height of the water plug within the compartments is thus an important parameter. The theory, developed from first principles, is verified against data from inclining experiments conducted on a nine-compartment air cushion supported structure at different drafts and water plug heights. The theory shows that the air cushion affects the stability in two conflicting ways: favorable decrease in the vertical center of gravity caused by the water plug effect and unfavorable enhancement of the internal free surface effect. The net effect on stability depends on the operating conditions as well as on the scale of the structure being considered. A correction factor for the metacentric height incorporating the air cushion effects is proposed.

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39

Nakao, Yohichi, Kenji Suzuki, Kohei Yamada, and Kohei Nagasaka. "Feasibility Study on Design of Spindle Supported by High-Stiffness Water Hydrostatic Thrust Bearing." International Journal of Automation Technology 8, no. 4 (July 5, 2014): 530–38. http://dx.doi.org/10.20965/ijat.2014.p0530.

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The machining accuracy of ultra-precision machine tools relies on the performance of the spindle and linear table. The machining accuracy of ultra-precision machine tools is now at the level of several tens of nanometers. In order for ultra-precision machine tools to achieve machining accuracy, a precise spindle system is indispensible. High bearing stiffness is particularly important to minimize displacement due to the cutting force. This paper considers a spindle design supported by high-stiffness water hydrostatic thrust bearings. An objective of this study is to design a precision spindle supported by water hydrostatic thrust bearings with 1 kN/µm bearing stiffness. The bearing restrictors are chosen so that the highest stiffness can be obtained for given bearing parameters. The influences of gap sizes and supply water pressure on the bearing stiffness are presented. Based on the feasibility study done on the design of highstiffness water hydrostatic thrust bearings, the spindle is designed and developed. The influences of the water pressure on the spindle deformation and bearing stiffness are also investigated.

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40

Stan, Gheorghe. "Floating Hydrostatic Bearings for Numerically Controlled Machine Tools." Applied Mechanics and Materials 809-810 (November 2015): 730–35. http://dx.doi.org/10.4028/www.scientific.net/amm.809-810.730.

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The use of hydrostatic guideways in CNC machine-tools is very common as a result of their low friction coefficient. The major problem of hydrostatic guideways represents the recovery of the fluid used in guideways, where the fluid should be protected against mechanical impurities and then led towards the hydraulic aggregate. The floating support described in this paper resolves the collection of fluid by using a closed circuit, without exposing the fluid to mehanical impurities and to a gravitational collecting.

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41

Shao, Jun-peng, Yan-qin Zhang, Yong-hai Li, Xiao-dong Yu, and Hui Jiang. "Influence of load capacity on hydrostatic journal support deformation in finite element calculation." Journal of Central South University of Technology 15, S2 (December 2008): 245–49. http://dx.doi.org/10.1007/s11771-008-0465-1.

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42

ORTEGÓN GALLEGO, FRANCISCO. "REGULARIZATION BY MONOTONE PERTURBATIONS OF THE HYDROSTATIC APPROXIMATION OF NAVIER–STOKES EQUATIONS." Mathematical Models and Methods in Applied Sciences 14, no. 12 (December 2004): 1819–48. http://dx.doi.org/10.1142/s0218202504003830.

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Due to the lack of regularity of the solutions to the hydrostatic approximation of Navier–Stokes equations, an energy identity cannot be deduced. By including certain nonlinear perturbations to the hydrostatic approximation equations, the solutions to the perturbed problem are smooth enough so that they satisfy the corresponding energy identity. The perturbations considered in this paper are of the monotone class. Three kinds of problems are then studied. To do that, we introduce a functional setting and show in every case that the set of smooth functions with compact support is dense in the space where we search for solutions. When the perturbations are small enough in a certain sense, the solutions of the perturbed problem are close to those of the original one. As a result, this gives a new proof of the existence of solutions to the hydrostatic approximation of Navier–Stokes equations. Finally, this regularization technique has been applied to the analysis of a one-equation hydrostatic turbulence model.

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43

Suslov, Nikolay, and Stanislav Chernukhin. "Determination of the working area of a hydraulic excavator." E3S Web of Conferences 177 (2020): 03016. http://dx.doi.org/10.1051/e3sconf/202017703016.

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The article discusses the mechanisms of walking used on dragline excavators. The disadvantages of each mechanism are identified and based on this, the most promising movement mechanism is selected – a three-legged walking mechanism with a hydraulic drive. For this mechanism, the main disadvantages are also identified. The following is a technical solution that allows you to save this mechanism from the main drawback – the need to raise the center of mass of the excavator to a significant height to ensure the maximum step value. The technical solution includes the presence of a flat hydrostatic support that allows to increase the efficiency of the mechanism in open-pit mining operations. The calculation of oil consumption through a flat hydrostatic support in the conditions of its use on quarry soils with different bearing capacity is made.

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44

Ye, Hong Ling, Pin Wen, and Xiao Long Zheng. "Dynamic Optimization of Hydrostatic Supported Worktable System with Circular Oil Recess." Applied Mechanics and Materials 299 (February 2013): 8–11. http://dx.doi.org/10.4028/www.scientific.net/amm.299.8.

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In this paper, optimal parameters in hydrostatic supported worktable system with circular oil recess are calculated. The optimal model is established in which the objective is to make natural frequency deviate from speeds of the rotary work axis, and the design variables are recess number, initial oil film thickness and recess radius. As the design variable vector includes both discrete and continuous components, two-phase optimization strategy is developed. Furthermore Fibonacci method is applied to deal with the problem of discrete variable, and response surface methodology is used to form an explicit expression between the objective expression and continuous variables. Then the optimal model is solved by gradient projection method and simplex method. As a result, numerical calculation of dynamic optimization with hydrostatic worktable system with circular recess shows that two-strategy optimization algorithm is stable and effectively.

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45

Frank, James A., Yibing Wang, Oscar Osorio та Michael A. Matthay. "β-Adrenergic agonist therapy accelerates the resolution of hydrostatic pulmonary edema in sheep and rats". Journal of Applied Physiology 89, № 4 (1 жовтня 2000): 1255–65. http://dx.doi.org/10.1152/jappl.2000.89.4.1255.

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To determine whether β-adrenergic agonist therapy increases alveolar liquid clearance during the resolution phase of hydrostatic pulmonary edema, we studied alveolar and lung liquid clearance in two animal models of hydrostatic pulmonary edema. Hydrostatic pulmonary edema was induced in sheep by acutely elevating left atrial pressure to 25 cmH2O and instilling 6 ml/kg body wt isotonic 5% albumin (prepared from bovine albumin) in normal saline into the distal air spaces of each lung. After 1 h, sheep were treated with a nebulized β-agonist (salmeterol) or nebulized saline (controls), and left atrial pressure was then returned to normal. β-Agonist therapy resulted in a 60% increase in alveolar liquid clearance over 3 h ( P< 0.001). Because the rate of alveolar fluid clearance in rats is closer to human rates, we studied β-agonist therapy in rats, with hydrostatic pulmonary edema induced by volume overload (40% body wt infusion of Ringer lactate). β-Agonist therapy resulted in a significant decrease in excess lung water ( P < 0.01) and significant improvement in arterial blood gases by 2 h ( P < 0.03). These preclinical experimental studies support the need for controlled clinical trials to determine whether β-adrenergic agonist therapy would be of value in accelerating the resolution of hydrostatic pulmonary edema in patients.

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46

Zhidkov, A. A., I. Y. Vasiutinskiy, and S. I. Vasyutinskaya. "Modern technologies of high-rise construction geodetic support." Geodesy and Cartography 972, no. 6 (July 20, 2021): 10–16. http://dx.doi.org/10.22389/0016-7126-2021-972-6-10-16.

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High-rise characteristics of skyscrapers in different countries, including Russia, are given. There are promising projects of constructing new skyscrapers. These high-rise structures have their own design features, they are objects of a high responsibility level, and require arranging reliable geodetic support to be constructed and operated. The specifi cs of high-rise construction geodetic support are noted. The role of high-quality support increases with the amount of fl oors. The errors of the formwork removal to the installation horizons are considered. The accuracy requirements for geodetic operations and precision of creating a planned reference network are formed. The methods of transmitting plane coordinates to high horizons and the disadvantages of the currently used technologies are shown. Recommendations for the use of new geodetic technologies in high-rise construction are formulated. The ways of high-rise structure fl uctuations geodetic monitoring based on using video displacement sensors, GPS receiver, video hydrostatic sensors and inclinometers are presented. Measurements are performed with special computer programs. The proposed geodetic technology has been tested in Russia in a number of construction sites. Recommendations on the use of modern geodetic technologies in high-rise construction, depending on the height, are presented.

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47

Huang, Long, Wen Li Ma, and Jin Long Huang. "Calculation and Simulation Azimuth Hydrostatic Thrust Bearing of a Large Alt-Azimuth Telescope." Applied Mechanics and Materials 364 (August 2013): 28–32. http://dx.doi.org/10.4028/www.scientific.net/amm.364.28.

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The use of hydrostatic bearing for support of telescope offers a number of potential performance advantages, but the structure parameter of bearing is the main factor which influence the bearing. The temperature rise of bearing is also important for the stiffnees of the telescope mount.In addition to the known benefit of mount stiffness and tracking accuracy from exceedingly low friction, the hydrostatic bearing provides a wide range of geometric possibilities for large telescopes [1].This paper analyzes various familiar hydrostatic bearing for the azimuth and elevation axes of telescope.Theoretical calculation and simulation show that the performance of bearing meets telescope’s design requirements.The principle and process of this work and Finite Element Analysis (FEA) are introduced in detail. According to the CFX result, the structure parameter and performance of bearing ,temperature field and pressure distribution have obtained.

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48

Nakao, Yohichi, Rei Kirigaya, Dmytro Fedorynenko, Akio Hayashi, and Kenji Suzuki. "Thermal Characteristics of Spindle Supported with Water-Lubricated Hydrostatic Bearings." International Journal of Automation Technology 13, no. 5 (September 5, 2019): 602–9. http://dx.doi.org/10.20965/ijat.2019.p0602.

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Characteristics of a spindle supported with water-lubricated hydrostatic bearings were experimentally investigated. In particular, this paper focuses on the thermal characteristics of the spindle. The flowrates of water as the lubricating fluid were measured separately for the radial and thrust bearings, in relation to the supply pressure. Fluid power losses owing to pressure losses of the lubricating fluid were then introduced. Furthermore, the power losses owing to the water viscosity were determined by measuring the spindle torque and angular velocity. The experiments revealed that the total power loss of the spindle is approximately 300 W. The cooling effect of the lubricating water was then examined by introducing a temperature increase between the supply and drain water. The experimental results verified that the water temperature increased by approximately 0.8°C, at a spindle speed of 3000 min-1. Based on the temperature increase of the water, the power removed from the spindle by the water flow was estimated. By comparing the generated total power loss and the power transferred by the water flow, the cooling efficiency of the flow of lubricating-water was defined in this paper. If the cooling efficiency is 100%, the temperature change of the spindle can be zero regardless of the power loss, achieving ideal thermal stability of the spindle. Experimental results revealed that the cooling efficiency of the tested spindle was over 80%. This indicates that the flow of water as a lubricating fluid removes generated heat from the spindle effectively, and achieves improved thermal stability of the spindle.

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49

Carpino, Marc, and Jih-Ping Peng. "Theoretical Performance of a Hydrostatic Foil Bearing." Journal of Tribology 116, no. 1 (January 1, 1994): 83–89. http://dx.doi.org/10.1115/1.2927051.

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The performance of a hydrostatic foil journal bearing operating with an incompressible fluid is discussed. In the configuration considered here, pressurized lubricant fluid is supplied through capillaries to recessed pockets on the surface of the journal. The foil is treated as a perfectly flexible, inextensible shell by a three dimensional finite element model. The pressure distribution is predicted by a finite element formulation of the incompressible Reynolds equation. Results are presented which demonstrate that the foil structure enhances load support while increasing lubricant film thickness. In addition, results indicate that membrane effects are essential in the structural model.

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50

Nazin, Vladimir. "Revealing deformation of segments and their supports in a hydrostatic segmental bearing." Eastern-European Journal of Enterprise Technologies 4, no. 7(112) (August 31, 2021): 33–40. http://dx.doi.org/10.15587/1729-4061.2021.239066.

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At present, there are theoretical and experimental studies of such bearings without taking into account the elastic deformation of the bearing segments. The rotor bearings of powerful turbines at nuclear power plants are subjected to loads as high as tens of tons. One of the important issues in designing segmental bearings operating under these conditions consists in taking into account elastic deformations of the segments. A schematic diagram of a segmental hydrostatic bearing was presented and the principle of its operation was described. When determining the deformation of spherical support, a formula of change in volume of a solid steel ball subjected to uniform pressure was applied. To determine the segment deformation in the axial direction, differential equation of bending of the strip beam as the initial one. The basic equation of deformation of rods with a curved axis acting in the plane of curvature was taken as a starting point of determining the segment deformation in the circumferential direction. It was found in the studies that the maximum deformation of the segment is 4.5 % of radial clearance at a feed pressure of 5 MPa and can affect the bearing characteristics. A substantially nonlinear character of deformations along the segment axis was revealed. It was found that the pressure of the working fluid significantly affects the segment thickness. With an increase in feeding pressure from 1 MPa to 10 MPa, the thickness of the steel segment increased more than 2 times and the thickness of the bronze segment increased more than 3 times. It was established that the pressure of the working fluid exceeding 10 MPa substantially affects the deformation of the spherical support and the bearing clearance. The study results will make it possible to determine more accurately the main characteristics of the segmental bearing and design it more efficiently.

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