Component level study of an actively lubricated LEG Tilting Pad Bearing: Theory and experiment

Abstract

This article constitutes the second step in a research effort aiming at evaluating the feasibility of introducing active characteristics into standard leading edge groove (LEG) tilting pad journal bearings. The strategy proposed is to control the LEG inlet flow using a servovalve. This work portrays the first experimental study for the"proof of concept" of this configuration, as well as a comparison with theoretical results. A simplified setup, featuring a rigid rotor supported by a single pad arrangement is the subject of study. The obtained results prove the viability of the proposed active bearing design, validate the available simulation tool and exemplify on a conceptual level the operational benefits from introducing this technology into standard LEG Tilting Pad Bearings.

Effect of direct injection and pivot stiffness on the static performance parameters of tilting pad journal bearings

“…Varela et al 36 presented theoretical and experimental results of static and thermal behavior of TPJBs operating with controllable lubrication, injecting high-pressure oil into the pad clearance through a drilled hole in the radial direction of the bearing pad. Varela et al [37][38][39] also verified theoretically and experimentally the feasibility of active TPJBs featuring the leading edge groove (LEG) concept. Bizarre et al 2 investigated the effect of pivot flexibility and direct injection on a TPJB, comparing theoretical predictions with experimental measurements, revealing promising results for theoretical models in rotor-bearing systems application.…”

Cooled pads with bioinspired gyroid lattice for tilting pad journal bearings: Experimental validation of numerical model for heat transfer

“…This layout has been deeply investigated by many authors, such as Hagemann et al [8] and Abdollahi et al [9]. The reduction of oil temperature is accomplished by increasing the turbulence intensity [10] and by implementing an active control on the delivered oil quantity [11]. Schüler et al [12] further improve the oil cooling by exploiting the effect of turbulence generated by eddy grooves, or Yang et al in [13] implement a power loss reduction technique by favouring oil cavitation.…”

Nonlinear dynamic behavior and stability of a rotor/seal system with the dynamic vibration absorber

“…In addition, various types of dampers are used for the rotor vibration attenuation, for example, the magnetorheological squeeze film damper was utilized to reduce the rotor vibration by Hemmatian and Ohadi. 8 The bearing parameters can be self-adjusted by the tilting-pad journal bearing, and it is suitable to suppress the oil film whirl and whip occurring in the rotor system; for example, Chasalevris and Dohnal, 9,10 Santos and colleagues, [11][12][13] and Queiroz et al 14 investigated the active tilting-pad journal bearing and the active fluid-film bearing to extend the stability margins for the rotor system. Another example of the parameter adjusting is the seal parameter adjusting.…”