Hydrostatic equilibrium

About: Hydrostatic equilibrium is a research topic. Over the lifetime, 2451 publications have been published within this topic receiving 62172 citations.

Lubrication and Heat Transfer in a Crown-Compensated Press Roll

Abstract: This study analyzes the lubrication problem in the channel formed by the inside surface of a rotating crown-compensated impulse drying press roll and the bottom surface of an internal hydrostatic shoe. By matching the mass flow of the lubricant through the capillaries in the shoe to the mass flow in the channel and using a wedge approximation to the curvilinear channel, expressions are developed for the velocity fields in each subregion of the channel and all the tangential and normal forces acting on the bottom of the shoe and the inside surface of the roll. These forces are then employed to set up a system of three equilibrium equations governing the balance of all horizontal and vertical forces acting on the bottom surface of the shoe as well as balance of the moments of these forces. The equilibrium equations form a system of nonlinear coupled transcendal algebraic equations and are solved, numerically, for given loads on the shoe and tangential speeds of the roll by an iterative procedure. The analyt...

Hydrodynamic and hydrostatic modelling of hydraulic journal bearings considering small displacement condition

Abstract: This paper proposes modified coefficients for the dynamic model of hydraulic journal bearing system that integrates the hydrodynamic and hydrostatic properties. In recent years, design of hydraulic bearing for machine tool attracts worldwide attention, because hydraulic bearings are able to provide higher capacity and accuracy with lower friction, compared to conventional bearing systems. In order to achieve active control of the flow pressure and enhance the operation accuracy, the dynamic model of hydraulic bearings need to be developed. Modified coefficients of hydrostatic stiffness, hydrodynamic stiffness, and squeeze damping of the dynamic model are presented in this work, which are derived referring to small displacement analysis from literature. The proposed modified coefficients and model, which consider the pressure variations, relevant geometry size, and fluid properties of the journal bearings, are able to characterise the hydrodynamic and hydrostatic properties with better precision, thus offering the following pragmatic contribution: (1) on-line prediction of the eccentricity and the position of the shaft in the face of external force that results in vibration; (2) development of active control system to regulate the supply flow pressure and to minimize the eccentricity of the shaft. Theoretical derivation and simulation results with different vibration cases are discussed to verify the proposed techniques.

Gravitation, Inertia and Weightlessness as the Centrifugal Effects of Interaction Energy of the n–Body System

Abstract: Newton’s problem on the mutual attraction of two bodies, which depicts similar trajectories around their common centre of gravity and around each other, is based on the geometric solution of Kepler’s problem formulated in his first two laws. Applying Jacobi dynamics, we analyzed orbital motion of the Earth, the Moon and other planets and satellites and discovered one more law of orbital velocity common to all Solar System bodies. The new law allows a new look at the nature of gravitation and the processes of creation and decay in celestial bodies.

Research on Temperature Field of Hydrostatic Thrust Bearing with Annular Cavity Multi-Pad

Abstract: A simulation research concerning temperature field of hydrostatic thrust bearing having annular cavities multi-pad was described in order to solve the thermal deformation of the hydrostatic thrust bearing with annular cavity multi-pad in the heavy CNC equipment. The Finite Volume Method of CFX has been used to compute three-dimensional temperature field of gap fluid between the rotation worktable and base. This study theoretically analyzes the influence of rotating velocity on the bearing temperature performance according to computational fluid dynamics and lubricating theory. It has revealed its temperature distribution law. The simulation results indicate that an improved characteristic will be affected by rotating velocity easily, and oil cavity temperature increases by gradually with rotating velocity enhancing. Through this method, the safety of a hydrostatic thrust bearing having annular cavities multi-pad can be forecasted, and the optimal design of such products can be achieved, so it can provide reasonable data for design, lubrication, experience and thermal deformation computation for hydrostatic thrust bearing in the heavy CNC equipment.