Results 61 to 70 of about 28,663 (219)
Design of High Damping Hydrostatic Gas Thrust Bearing with Grid-Shaped Grooves.
TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C, 1995 In this study we propose a design of a new hydrostatic gas annular thrust bearing with grid-shaped grooves which can provide high damping ratio in a desired high-frequency region as well as high stiffness. The basic idea to increase the gas film damping at a high-frequency region is to form a set of small-width bearings in a high static pressure region
Hiroshi Yamamoto, Kyosuke Ono
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Fatigue &Fracture of Engineering Materials &Structures, EarlyView.ABSTRACT The degradation of metallic materials due to hydrogen embrittlement (HE) poses critical challenges for structural reliability. Phase‐field models offer an energy‐based approach that does not require predefined crack paths and automatically determines crack initiation, growth, and coalescence.
Shaymaa Merheb +7 more
wiley +1 more source
An eye on long‐duration spaceflight: Controversies, countermeasures and challenges
Experimental Physiology, EarlyView.Abstract Space flight‐associated neuroocular syndrome (SANS) is a consequence of long‐duration space flight and is detected in two‐thirds of astronauts. In‐flight, this can cause a change in the refraction of the eyes, requiring graded hypermetropic ‘superfocus adjustable’ glasses, optic nerve head oedema and choroidal folds.
Vincent Wing Sum Ng +1 more
wiley +1 more source
Shallow grooves in journal improve air bearing performance [PDF]
, 1968 Bearing designs, which shape the surface to create artificial fluid-film wedges in the absence of any applied radial load, generate radial restoring forces to keep journals from whirling.
Anderson, W. J. +2 more
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Jumping on the moon as a potential exercise countermeasure
Experimental Physiology, EarlyView.Abstract The Moon's gravitational field strength (17% Earth's gravity) may facilitate the use of bodyweight jumping as an exercise countermeasure against musculoskeletal and cardiovascular deconditioning in reduced gravity settings. The present study characterised the acute physiological and kinetic responses to bodyweight jumping in simulated Lunar ...
Patrick Swain +4 more
wiley +1 more source
Overview of free-piston Stirling technology at the NASA Lewis Research Center [PDF]
, 1985 An overview of the National Aeronautics and Space Administration (NASA) Lewis Research Center (Lewis) free-piston Stirling engine activities is presented.
Slaby, J. G.
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Spaceborne and spaceborn: Physiological aspects of pregnancy and birth during interplanetary flight
Experimental Physiology, EarlyView.Abstract Crewed interplanetary return missions that are on the planning horizon will take years, more than enough time for initiation and completion of a pregnancy. Pregnancy is viewed as a sequence of processes – fertilization, blastocyst formation, implantation, gastrulation, placentation, organogenesis, gross morphogenesis, birth and neonatal ...
Arun V. Holden
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Evaluation of a hybrid hydrostatic bearing for cryogenic turbopump application [PDF]
A hybrid hydrostatic bearing was designed to operate in liquid hydrogen at speeds to 80,000 rpm and radial loads to 440 n (100 lbf). The bearing assembly consisted of a pair of 20-mm angular-contact ball bearings encased in a journal, which was in turn ...
Hannum, N. P. +2 more
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Vibration Analysis of Hydrostatic Gas Bearing Spindle Considering the Elastic Deformation of Rotor.
TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C, 1996 In this study, we present the vibration analysis procedure of a hydrostatic gas bearing spindle considering the stiffness and damping of a gas film and the effect of elastic deformation of the components of a rotor. An equation of motion for the elastic vibration of the rotor is formulated using the finite element method and then combined with the ...
Hiroshi YAMAMOTO +3 more
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Recirculation of a Two-phase Fluid by Thermal and Capillary Pumping [PDF]
, 1961 Closed-cycle gas supply system for gas bearings using thermal and capillary ...
Laub, J. H., Mc Ginness, H. D.
core +1 more source