Topic
Hydrostatic equilibrium
About: Hydrostatic equilibrium is a research topic. Over the lifetime, 2451 publications have been published within this topic receiving 62172 citations.
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09 May 2019
TL;DR: In order to improve the lubrication performance of the double-rectangular cavity hydrostatic thrust bearing, the authors selects the temperature rise characteristics of hydrostatic bearing as the re-routing parameter.
Abstract: In order to improve the lubrication performance of the double-rectangular cavity hydrostatic thrust bearing, this paper selects the temperature rise characteristics of hydrostatic bearing as the re...
6 citations
Patent•
09 Feb 2011
TL;DR: In this paper, a hydraulic control system of a frequency-conversion constant-current hydrostatic bearing, which comprises a numerical control system, an alternating-current frequency converter, an ADF motor, a gear pump, and a radial bearing, is presented.
Abstract: The invention relates to the hydraulic control system of a frequency-conversion constant-current hydrostatic bearing, which comprises a numerical control system, an alternating-current frequency converter, an alternating-current frequency conversion motor, a gear pump, a radial hydrostatic bearing, and a pressure, flow and temperature detection feedback system. A main shaft is arranged within the hydrostatic bearing. The hydrostatic bearing is provided with a hydraulic oil input channel and a hydrostatic oil cavity. An oil slick for ensuring the overload high-precision rotation of the main shaft is arranged between the main shaft and the hydrostatic bearing. The numerical control system comprises a data processing system and a PLC (Programmable Logic Controller), wherein the PLC, the alternating-current frequency converter and the alternating-current frequency conversion motor are connected in sequence; the alternating-current frequency conversion motor is connected with the gear pump, the gear pump is connected with the pressure, flow and temperature detection feedback system and a hydrostatic oil chamber, and the pressure, flow and temperature detection feedback system are arranged between the radial hydrostatic bearing and the data processing system. The hydraulic control system of the frequency-conversion constant-current hydrostatic bearing can automatically adjust and lock the flow of hydrostatic oil and realize the heavy-load high-precision function. The radial runout of the main shaft can reach 0.006mm on a 500t-load numerical control heavy-duty horizontal lathe.
6 citations
TL;DR: In this paper, a method for developing long-term hydrostatic design stresses, defined as the estimated tensile stress in the wall of a pipe in the circumferential orientation due to internal hydrostatic pressure that can be applied continuously with a high degree of certainty that failure of the pipe will not occur, for thermoplastic pipe materials is described.
Abstract: A method for developing long-term hydrostatic design stresses, defined as the estimated tensile stress in the wall of the pipe in the circumferential orientation due to internal hydrostatic pressure that can be applied continuously with a high degree of certainty that failure of the pipe will not occur, for thermoplastic pipe materials is described. The background information used to develop this method, data to confirm its validity, and several of its more important peculiarities are presented and discussed. The method treats hydrostatic stress–failure time test results by the method of least squares with time as the dependent variable. The long-trem performance of thermoplastic pipe materials is evaluated by stresses calculated for periods of 100,000 hours (11.43 years) and 50 years.
6 citations
01 May 2010
TL;DR: In this paper, a simple saturation argument in combination with linear theory is used to obtain the relevant dynamical scales for a gravity wave near breaking level, and the resulting equation hierarchy is consistent with that obtained from the pseudo-incompressible equations, both for non-hydrostatic and Hydrostatic gravity waves.
Abstract: Multiple-scale asymptotics is used to analyze the Euler equations for the dynamical situation of a gravity wave (GW) near breaking level. A simple saturation argument in
combination with linear theory is used to obtain the relevant dynamical scales. As small expansion parameter the ratio of inverse of the vertical wave number and potentialtemperature and pressure scale heights is used, which we allow to be of the same order of magnitude here. It is shown that the resulting equation hierarchy is consistent with that obtained from the pseudo-incompressible equations, both for non-hydrostatic and
hydrostatic gravity waves, while this is not the case for the anelastic equations unless the additional assumption of sufficiently weak stratication is adopted. To describe vertical propagation of wave packets over several atmospheric scale heights, WKB theory is used to show that the pseudo-incompressible flow divergence generates the same amplitude equation that also obtains from the full Euler equations. This gives a mathematical justication for the use of the pseudo-incompressible equations for studies of gravity-wave breaking in the atmosphere for arbitrary background stratication. The WKB theory interestingly also holds at wave amplitudes close to static instability. In the mean-flow equations we obtain in addition to the classic wave-induced momentum-flux divergences a
wave-induced correction of hydrostatic balance in the vertical-momentum equation which cannot be obtained from Boussinesq or anelastic dynamics.
6 citations
TL;DR: In this paper, a Cambridge serial total energy package code analysis using the Density Functional Theory was performed to calculate the structural, electronic, elastic, optical, and thermodynamic characteristics as well as the bonding nature of cubic fluoro-perovskites RbHgF3 under various hydrostatic pressures.
Abstract: Mercury fluoro-perovskites based on Rubidium have a lot of technical relevance nowadays, especially in optical and semiconductive applications. A Cambridge Serial Total Energy Package code analysis using the Density Functional Theory was performed to calculate the structural, electronic, elastic, optical, and thermodynamic characteristics as well as the bonding nature of cubic fluoro-perovskites RbHgF3 under various hydrostatic pressures. To determine the total energy, the Perdew–Berke–Ernzerhof generalized gradient approximation was used to manage the exchange–correlation potential. The effects of hydrostatic pressure are studied in the region of 0–20 GPa, which maintains the cubic stable condition of RbHgF3 fluoro-perovskite. Experimental and prior theoretical results agree well with the calculated lattice parameters. When the pressure reached 20 GPa from 0 GPa, the volume, bond length, and lattice constant decreased. The bandgaps demonstrate an indirect band structure, with substantial reductions at various external forces. The total density of states reveals a non-metallic behavior. Mechanical properties satisfy the stability criteria until 20 GPa for this compound, and ductile behavior is also found within that pressure range. External stress modifies the optical characteristics a bit such as the complicated dielectric function, absorption, conductivity, and reflectivity. The presence of blue shift is confirmed by the movement of absorption edges toward higher energies, making this material an intriguing option for optical devices.
6 citations