The paper deals with the experimental characterization of different 280 mm diameter tilting pad journal bearings for turbomachines using a dedicated test rig. articles were 5-pad Direct Lube Rocker Pivot bearing, Flooded and 4-pad Ball Socket bearing. three tested in their specific design range operating conditions. Their static dynamic behavior was investigated as function parameters. In parti...

Byron R. Knapp, Brian P. O’Connor, Eric R. Marsh Machine Dynamics Research Lab The Pennsylvania State University, University Park, PA Introduction As the demand for higher precision machine tools and inspection equipment grows, there is a need for more precise bearing systems. The error motions of bearings with mechanical contact are dominated by the geometric and surface finish errors of their...

Double-layer composite water-lubricated bearing is a new type of which can integrate the good damping performance low elastic under-layer bush and tribological plastic layer bush. This paper analyzes its elastohydrodynamic lubrication by fluid–structure interaction (FSI) method, studies effects eccentricity ratio, rotational speed, modulus distribution thickness on performance. Results show tha...

Seismic hazards remained as a challenge to engineers over ages. In order to reduce loss of life and damage to property due to earthquake, several techniques have been developed among which Seismic Isolation technique using Elastomeric Isolators has gained high acceptance and becoming popular all over the world, due to its simplicity, reliability and overall cost effectiveness. Seismic Isolation...

This Note proposes a novel radial-thrust combo metal mesh foil bearing (MMFB). Although MMFBs have advantages such as higher stiffness and damping over conventional air foil bearings, studies related to MMFBs have been limited to radial MMFBs. The novel combo MMFB is composed of a radial top foil, thrust top foils, and a ring-shaped metal mesh damper--fabricated by compressing a copper wire mes...

Abstract The Active Magnetic Bearing (AMB) technology is introduced in the High Temperature Reactor-Pebble-bed Modules (HTR-PM) demonstration nuclear power plant, which being constructed Shandong province, China. auxiliary bearing one of most important components guaranteeing reliability AMB. It also has an impact on whole reactor system. Compared with traditional bearing, a novel proposed by a...

This paper explores the experimental issues associated with the implementation of the recently developed generalized complementary flux constraint (GCFC) flux-biasing scheme on a spacecraft reaction wheel that is magnetically suspended by a low-loss active magnetic bearing (AMB). Implementation of the GCFC depends fundamentally on the ability to estimate the electromagnet flux. Once addressed, ...

The essential customer needs of today, namely long bearing service life and low noise performance, demand the availability of a means to verify that the required cleanliness level and lubrication conditions are fulfilled. To fulfil these needs, a new equipment, the SKF BEQUIET+ tester has been developed to assess the quality of the lubricant with regard to cleanliness and damping characteristic...

The aim of this study was to further research the mechanical properties epoxy thick-layer rubber isolation bearings, adopting orthogonal design and efficacy coefficient methods in order optimize geometric dimensions material parameters bearing, summarizing influence various factors on overall performance indicators determining optimal plan through parameter adjustment. Through a combination exp...

identification of damping parameter is usually more complicated and unreliable comparing to mass or stiffness identification in structural dynamics. there are many factors such as intermolecular friction, coulomb friction and viscous damping affecting the damping mechanisms in a structure. therefore it is difficult, and in some cases impossible, to describe the details of damping mechanisms by ...