Abstract
The direct problem of researching the load capacity of segment gas-static bearing is being discussed. In calculation the movement of the shaft in the bearing is considered slow comparing than the rotational velocity. Vibrations and the influence of non-stationarity are neglected. The given geometry of the bearing and the pressure of lubrication supply in the gap between the bearing and the shaft are considered initial data. The result of the calculation is the value of the resultant pressure force, applied to the bearing segments. Summing the forces the value of the static load capacity can be found. For segments that may spontaneously rotate about the joint axis, described a method of calculating the rotation angle, at which the main moment of pressure forces applied to the segment is equal to zero and the segment's position is stable.
Highlights
The design of efficient and reliable bearings of the modern turbo-machine has become a common engineering problem, which implies the choosing of the standard design solutions according to given conditions
The need for detailed studies arises in cases when the bearings are used under the special conditions: High or low velocities, high loads, a large number of starts, nontypical working environments (Bulat et al, 2013)
The development of the sleeve bearings usually involves a detailed study of the rotor system dynamics
Summary
The design of efficient and reliable bearings of the modern turbo-machine has become a common engineering problem, which implies the choosing of the standard design solutions according to given conditions. The need for detailed studies arises in cases when the bearings are used under the special conditions: High or low velocities, high loads, a large number of starts, nontypical working environments (Bulat et al, 2013). Study of the dynamic behavior of sliding bearings themselves is a collection of complex interdisciplinary problems and lies in the joint solution of Reynolds equation, which was first described by (Grassam and Powell, 1964) and the dynamics equation of the mechanical system, which includes a rotor and bearing with a components of external compliance and damping (Bulat and Uskov, 2012). Where: ucr = Critical speed-the rotational velocity at the shaft’s surface, at which a flow with Taylor vortices occurs H = The radial gap size V = The kinematic viscosity from whence. Developed turbulent flows can occur in non-loaded bearing areas, as well as in local elements (grooves, edges, holes)
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