Abstract: A gearbox assembly for a gas turbine engine used in an aircraft having passive lubrication capabilities during wind milling includes a gearbox housing, a gear train assembly housed within the gearbox housing, a lubricant in the gearbox housing for lubricating the gear train assembly, and a first scavenge port formed in the gearbox housing. The first scavenge port is changeable between an open position and a closed position. Further, the first scavenge port remains in the open position during normal operation of the gas turbine engine to allow the lubricant to drain from the gearbox housing. Upon occurrence of a loss of lubricant pressure in the gearbox assembly, the first scavenge port is changed to the closed position to trap at least a portion of the lubricant in the gearbox housing. Thus, the trapped lubricant provides passive lubrication to the gear train assembly during the loss of lubricant pressure.

Abstract: A gearbox assembly for a gas turbine engine used in an aircraft having passive lubrication capabilities during wind milling includes a gearbox housing, a gear train assembly housed within the gearbox housing, a lubricant in the gearbox housing for lubricating the gear train assembly, and a first scavenge port formed in the gearbox housing. The first scavenge port is changeable between an open position and a closed position. Further, the first scavenge port remains in the open position during normal operation of the gas turbine engine to allow the lubricant to drain from the gearbox housing. Upon occurrence of a loss of lubricant pressure in the gearbox assembly, the first scavenge port is changed to the closed position to trap at least a portion of the lubricant in the gearbox housing. Thus, the trapped lubricant provides passive lubrication to the gear train assembly during the loss of lubricant pressure.

Abstract: Embodiments of a bearing are provided herein. In one embodiment a bearing may include a bearing assembly having an inner race and an outer race; a plurality of rolling elements disposed between the inner race and the outer race, wherein at least one of the inner race, the outer race, and the plurality of rolling elements is at least partially fabricated from an AlMgB14 containing ceramic matrix composite.

Abstract: Embodiments of a bearing are provided herein. In one embodiment a bearing may include a bearing assembly having an inner race and an outer race; a plurality of rolling elements disposed between the inner race and the outer race, wherein at least one of the inner race, the outer race, and the plurality of rolling elements is at least partially fabricated from an AlMgB14 containing ceramic matrix composite.

Abstract: A journal bearing for use in an epicyclical gearbox including a journal pin, a journal bearing body into which the journal pin is disposed and at least one lubricating fluid inlet. The lubricating fluid inlet is configured to provide for an input of a lubricating fluid in a loaded arc portion proximate at least one high pressure point exerted upon the journal bearing body during a high pressure event, thereby permitting a free flow of a lubricating fluid there between the journal pin and the journal bearing body during the high pressure event. In an embodiment, the journal pin is configured to mimic the shape of the journal bearing body at least at a high pressure point exerted upon the journal bearing body during a high pressure event. An epicyclical gearbox including the journal bearing and method of facilitating a hydrodynamic oil flow in the planet gear journal bearing.

Abstract: A journal bearing for use in an epicyclical gearbox including a non-circular shaped journal pin and a journal bearing body into which the non-circular shaped journal pin is disposed. The non-circular shaped journal pin configured to mimic the shape of the non-cylindrical shaped journal bearing body at least at a high pressure point exerted upon the non-cylindrical shaped journal bearing body during a high pressure event, thereby permitting a free flow of a lubricating fluid there between the non-circular shaped journal pin and the journal bearing body during the high pressure event. An epicyclical gearbox including the journal bearing and method of facilitating a hydrodynamic oil flow in the planet gear journal bearing.

Abstract: A journal bearing for use in an epicyclical gearbox including a non-circular shaped journal pin and a journal bearing body into which the non-circular shaped journal pin is disposed. The non-circular shaped journal pin configured to mimic the shape of the non-cylindrical shaped journal bearing body at least at a high pressure point exerted upon the non-cylindrical shaped journal bearing body during a high pressure event, thereby permitting a free flow of a lubricating fluid there between the non-circular shaped journal pin and the journal bearing body during the high pressure event. An epicyclical gearbox including the journal bearing and method of facilitating a hydrodynamic oil flow in the planet gear journal bearing.

Abstract: A plurality of connecting elements projects from a body's surface. A plurality of indents is defined in the body's surface. Each stem element includes first and second stalks projecting orthogonally from the surface. The first stub includes a pyramidical cap section and at least one generally planar wall. The second stalk is generally parallel to the first stub and spaced apart from the at least one wall, defining a gap therebetween. The second stalk includes a stem projecting from the surface. A lip section extends from a distal end of the stem and protrudes outwardly relative to the stem. An engagement section extends from the lip section. A free end of the engagement section defines a distal end of the second stalk. An outer surface of the engagement section defines a first gradient tapering from the lip section to the distal end of the second stalk.

Abstract: A plurality of connecting elements projects from a body's surface. A plurality of indents is defined in the body's surface. Each stem element includes first and second stalks projecting orthogonally from the surface. The first stub includes a pyramidical cap section and at least one generally planar wall. The second stalk is generally parallel to the first stub and spaced apart from the at least one wall, defining a gap therebetween. The second stalk includes a stem projecting from the surface. A lip section extends from a distal end of the stem and protrudes outwardly relative to the stem. An engagement section extends from the lip section. A free end of the engagement section defines a distal end of the second stalk. An outer surface of the engagement section defines a first gradient tapering from the lip section to the distal end of the second stalk.

Abstract: Systems and methods provide for reducing motion which causes wear in a combustor. The method includes attaching a first end of a combustor liner to a retainer which encircles the first end of the combustor liner; attaching the retainer to a combustor casing, where the retainer acts as a spring between the combustor liner and the combustor casing; reducing a relative motion between the combustor casing and the combustor liner along a longitudinal axis and a circumferential axis of the combustor liner by the retainer; and locating the combustor liner substantially concentrically within the combustor casing.

Abstract: A plurality of connecting elements projects from a surface of an article. Each connecting element includes a first stalk and second hollow stalk projecting from the surface. The second stalk is generally coaxial with the first stalk and spaced apart from the first stalk defining a radial gap therebetween. The first stalk includes a cap section. The second stalk includes a stem projecting generally orthogonally, at a proximal end thereof, from the surface. A flange section having a first wall thickness extends from a distal end of the stem and has an outer diameter greater than an outer diameter of the stem at the distal end. An engagement section extends from the flange section. A free end of the engagement section having a second wall thickness defines a distal end of the second stalk and has an outer diameter less than the outer diameter of the flange section.

Abstract: An article includes a plurality of stems projecting from a surface thereof. Each stem includes a hollow stalk projecting orthogonally from the surface and a hollow head defined on a distal end of the hollow stalk. The head includes a flange section extending from the distal end of the hollow stalk and having an outer diameter greater than an outer diameter of the hollow stalk at the distal end. A cap section extends from the flange section, defines a distal end of the stem and has a generally convex contour. The cap section has a first wall thickness at the distal end of the stem, a second wall thickness at a junction of the cap section and the flange section and a third wall thickness at a circumferential section intermediate the distal end and the flange section. The third wall thickness is less than the first and second wall thicknesses.

Abstract: A system for detecting differential bearing damages includes a synthesized tachometer that generates a tachometer signal corresponding to the race speed difference of a bearing assembly such that the bearing damage speed difference dependency can be eliminated and the damage features can be enhanced. The system also includes acceleration enveloping in the cycle domain to further enhance the damage signatures.

Abstract: A method for heating a fluid in a turbine engine is provided. The method includes channeling an exhaust flow through an exhaust duct of the turbine engine and coupling a panel to the exhaust duct. The panel includes a first wall and an opposite second wall that is spaced a distance from the first wall such that at least one passageway is defined within the panel. The fluid is supplied to the at least one passageway through an inlet defined at a first end of the passageway, such that heat is transferred from the exhaust flow to the fluid flowing through the panel. The fluid is injected into the turbine engine.

Abstract: A system for detecting differential bearing damages includes a synthesized tachometer that generates a tachometer signal corresponding to the race speed difference of a bearing assembly such that the bearing damage speed difference dependency can be eliminated and the damage features can be enhanced. The system also includes acceleration enveloping in the cycle domain to further enhance the damage signatures.

Abstract: A method for heating a fluid in a turbine engine is provided. The method includes channeling an exhaust flow through an exhaust duct of the turbine engine and coupling a panel to the exhaust duct. The panel includes a first wall and an opposite second wall that is spaced a distance from the first wall such that at least one passageway is defined within the panel. The fluid is supplied to the at least one passageway through an inlet defined at a first end of the passageway, such that heat is transferred from the exhaust flow to the fluid flowing through the panel. The fluid is injected into the turbine engine.

Abstract: A retaining system for field winding end turns of a rotor, such as for a dynamoelectric machine. The rotor has an outer peripheral surface, radial end surfaces, axially-extending slots in the peripheral surface, and field windings in the slots. The field windings axially project from the end surfaces of the rotor and are connected outside of the slots by field winding end turns. The end turns are surrounded by the retaining system, which includes a shield member surrounding the end turns and a retainer member surrounding to the shield member. The shield member has flanges received in the slots along with the field windings. Fastening features engage the flanges to inhibit axial movement of the retaining system.

Abstract: A rotor for a rotating electrical machine includes pole faces arranged at locations on either side, respectively, of the rotor D-axis and fins arranged along the rotor Q-axis. The fins increase a section bending moment of inertia along the Q-axis, thereby reducing the need for deep slots in the pole faces extending along the D-axis, resulting in better symmetry of bending stiffness.

Abstract: In a communications network having at least one server, a plurality of distributed databases communicatively linked to the server, and the distributed databases having installation documents related to power plant equipment stored therein, a plurality of users communicatively linked to the server, a method for providing access to installation documents for assisting at least one user in installing power-plant equipment includes providing at the server an installation software tool for use by the user. The also includes supplying a list correlating source locations of installation documents stored in the plurality of distributed databases with installation software tool destination locations. The installation software tool is populated with links to the installation documents using information from the list, and installation documents are retrieved from the plurality of distributed databases in response to user selection of links using the installation software tool.