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• W51154504 abstract "An idea for a journal bearing with variable stiffness and damping properties is developed in order to decrease the vibration amplitude of a rotorjournal bearing system during passage through resonance. The introduction of an additional fluid film thickness in the bearing is proposed in this work in order to alter the dynamic properties in the bearing. The bearing ring is divided into two parts with the upper part being fixed with the housing and the lower part being flexibly mounted by a preloaded spring in parallel with a viscous damper. This allows relative motion between the two parts of the bearing ring. The relative motion introduces an additional fluid film zone in the bearing under the passive displacement of the lower part due to the higher impedance forces that are developed in the lubricant film close to resonance. The general concept is to change the system’s damping and stiffness coefficients using this extra fluid film thickness only when the system passes through its critical speed in order to quench the vibration amplitude. In the rest rotational speeds the bearing is considered to be fixed in order to behave as it was designed under the normal loading operational conditions. During the start up of a rotor bearing system the fluid film force magnitude can be calculated by solving the Reynold’s equation for every discrete time instant of journal response and thus the impedance forces are calculated. As the impedance fluid film forces obtain higher value during resonance (due to higher eccentricity of the journal), the moving part of the bearing (that is mounted in the external spring and damper) obtains the proper displacement so as to the additional fluid film to be introduced. In the external ‘spring-damper’ system the input (fluid film vertical force) and the output (bearing moving part displacement) are related with the convolution integral since the input is always a function of the bearing lower part displacement. A numerical simulation of a simple elastic shaft model supported by two journal bearings with variable geometry verifies that the vibration amplitude in the rotor’s mid-span is reduced by up to 70% compared to conventional journal bearing, while the vibration amplitude of the journal whirling inside each bearing do not show sensible difference." @default.
• W51154504 created "2016-06-24" @default.
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• W51154504 date "2011-09-05" @default.
• W51154504 modified "2023-10-01" @default.
• W51154504 title "A Journal Bearing with Variable Geometry for Reduction of Rotor Resonance Vibration" @default.
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