Authors
Iraq
Abstract
This paper presents the instantaneous journal center velocity under dynamic load
for adjustable hydrodynamic four pads bearing. The velocity is calculated by mobility
method in different values of length - diameter ratios (0.25, 0.5, 0.75 and 0.95). Finite
difference method was used to solve the Reynolds equation in two dimensions. This
equation includes the total oil film thickness (oil film thickness and elastic deformation
pad material due to generated pressure ).The effects of many parameters were studied
such as dynamic coefficients (stiffness and damping coefficients) and power loss on the
bearing performance. The results proved that the journal center velocity and mobility
components is affected by the sign of the eccentricity ratio components, also the
maximum value of the journal center velocity is determined by the values of the length -
diameter ratios. The vertical stiffness coefficient (Kyy) and damping coefficient (Cyy)
increase as the eccentricity ratio increased. The power loss were found increase when
length diameter ratio increase.
Keywords
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