Abstract: A planetary gearbox of a gas turbine engine has a planet gear which, via a bearing, is arranged rotatably on a planet pin of a rotatable planet carrier. Oil is introduced through an opening, arranged radially within the bearing, into an oil feed which is open at a feed side and which is connected to the bearing and rotationally joined to the carrier. As the carrier rotates, the oil downstream of the opening is conducted toward the bearing unit by centrifugal force. The open oil feed is, between the opening and the bearing, configured an oil filter through which the oil is conducted. The filter extends counter to the flow direction of the oil from the opening in the direction of the bearing unit, in a flow direction of the oil in the open oil feed.

Abstract: An electrical vertical takeoff and landing (eVTOL) aircraft includes an electrical propulsion unit that has a propeller or a fan configured to be driven to rotate by an electric motor arranged to receive electrical power from an inverter. The inverter includes a carrier substrate, and a converter commutation cell including a power circuit. The power circuit includes at least one power semiconductor switching element. Each power semiconductor switching element is comprised in a power semiconductor prepackage. A heat sink is arranged to remove heat from the respective power semiconductor prepackage. The heat sink is spaced apart from the carrier substrate to define a heat sink gap between the carrier substrate and the heat sink. A converter parameter ?, which is defined as a size of the heat sink gap divided by a maximum electric field strength in the heat sink gap, is less than or equal to 20 nm2/V.

Abstract: The disclosure relates to an electrical machine for a drive system of an electrically driven aircraft and its winding system. In particular, the disclosure relates to an interconnection unit for interconnecting the windings of the winding system. For electrically connecting winding arrangements of the winding system, the interconnection unit has a connection arrangement with large number of contact points which are configured and arranged on the interconnection unit such that these contact points of the interconnection unit may be connected to contact points of the winding arrangements to be contact-connected. The connection arrangement furthermore has a large number of electrical connection sections, wherein a respective connection section connects two of the contact points to one another. This interconnection unit may be contact-connected by way of its contact points to corresponding contact points of the winding arrangements, so that a desired winding system may be constructed in a simple manner.

Abstract: A method for modifying the mechanical and surface properties of a component. The method involves: removably attaching a component to at least one component support that is located within a vibratory trough of a component treatment apparatus, the at least one component support being a support shaft upon which the component is removably mountable within the vibratory trough; supplying the vibratory trough with treatment media; moving the component support or the vibratory trough so that the component is immersed into the treatment media; vibrating the vibratory trough to provide a substantially uniform surface treatment of the component, the vibratory trough being movable by at least one trough vibrating mechanism whose actuation is controlled by a controller in response to signals received from at least one sensor located on or within the vibratory trough; removing the component from the treatment media; and detaching the component from the component support.

Abstract: An electrical power system includes an electrical machine having one or more windings and an AC-DC power electronics converter including a commutation cell having a power circuit and a gate driver circuit. The power circuit includes a plurality of power semiconductor switching elements and a capacitor. The gate driver circuit is electrically connected to and configured to provide switching signals to a gate terminal of each power semiconductor switching element. A peak rated power output of the electrical machine and the AC-DC power electronics converter is greater than 25 kW, a maximum efficiency of the AC-DC power electronics converter is greater than 97%, and a value of parameter ? is greater than or equal to 0.3 PV/s2, where ? is a product of a maximum switching frequency of the switching signals and a maximum rate of change of a source-drain voltage of the plurality of power semiconductor switching elements.

Abstract: A blade component of a compressor or turbine stage of a gas turbine, in particular of a gas turbine engine is provided. The blade component has at least two structural elements which can be connected together by means of a connection process, in particular sintering. The at least two structural elements can be coupled and/or connected to at least one means for internal cooling of the blade component, and/or the means for internal cooling of the blade component is arranged in at least one of the least two structural elements. The at least two structural elements, when assembled, can be coupled to a cooling insert inside the blade component, wherein during operation, cooling air flowing into the cooling insert can be guided in targeted fashion via impingement cooling openings onto the inside of the blade component, in particular as impingement flow cooling.

Abstract: A method for identifying an inverter short circuit between two phases includes measuring AC current values of three phases. Values of a temporal current change are also identified based on the measured AC current values. A short circuit between two phases is then assumed if, in one phase at DC+ and one phase at DC?, the current rises more quickly or falls more quickly than a predetermined threshold value. In order to check this assumption, it is identified whether the value of the identified rise in a first phase possibly affected by the short circuit corresponds to the value of the identified fall in a second phase possibly affected by the short circuit. In the event that the assumption has been positively confirmed, it is also checked whether a current sum of the phases is still unchanged. A short circuit is established when the two checks have proven positive.

Abstract: Embodiments of the invention are shown in the figures, where a nacelle cowling structure for a turbomachine having a bypass duct defining a path for an airflow is provided, the nacelle cowling structure including: an outer layer defining an external surface of the nacelle cowling structure, an inner layer defining a surface of the bypass duct, a front mounting area for fixation to the turbomachine and a rear mounting area for fixation to the turbomachine downstream the front mounting area with respect to the bypass duct flow path, wherein a space between the outer and inner layers and between the front and rear mounting areas is filled with acoustic material.

Abstract: Aspects of the disclosure regard a fan case assembly for a gas turbine engine, the fan case assembly comprising a fan case having an inner surface, a fan case liner having an outer surface, and a reclosable fastening system attaching the fan case liner to the fan case, the reclosable fastening system comprising two components, a first component being attached to the fan case inner surface and a second component being attached to the fan case liner outer surface.

Abstract: A combustion chamber for an engine includes inner and outer combustion chamber walls bounding a combustion space. Three mixing air holes with respective central points at corner points of a virtual first or second triangle are arranged on mutually opposite first and second wall segments of the inner and outer walls. The second triangle of the second wall segment of the outer wall is oriented rotated by 180° with respect to the first triangle of the first wall segment of the inner wall, and the mixing air holes arranged in rows on the first and second wall segments are arranged with respect to one another so the mixing air holes of the first and second wall segments that are arranged at the corner points of the first and second triangles do not lie opposite a mixing air hole of the second or first wall segment.

Abstract: A power electronics converter may include a converter commutation cell having a power circuit and a gate driver circuit. The power circuit includes at least one power semiconductor switching element and at least one capacitor. Each power semiconductor switching element is included in a power semiconductor prepackage, each prepackage including one or more power semiconductor switching elements embedded in a solid insulating material, each power semiconductor switching element having at least three terminals including a gate terminal. The gate driver circuit is electrically connected to and configured to provide switching signals to the gate terminal of each of the at least one power semiconductor switching element. A peak rated power output of the power electronics converter is greater than 25 kW and a value of a converter parameter ? is less than or equal to 5 pHm3.

Abstract: A method for in-flight monitoring of the health of an aero gas turbine engine including in flow series a compressor system, a core gas generator including a combustor, and a turbine, and further including a shaft system connecting the turbine to the compressor system and forming a torque path there between. The method includes: measuring a first rotational speed of a forward portion of the shaft system; measuring a second rotational speed of a rear portion of the shaft system; measuring other operational parameters of the engine; calculating from the measured rotational speeds the power delivered by the torque path from the turbine to the compressor system; calculating from the other measured operational parameters the power delivered to the turbine by the core gas generator; correlating the power delivered by the torque path at a given time with the power delivered to the turbine at that time.

Abstract: A power electronics converter includes a carrier substrate, and a converter commutation cell including a power circuit. The power circuit includes at least one power semiconductor switching element. Each power semiconductor switching element is comprised in a power semiconductor prepackage. One or more terminals of each power semiconductor switching element are connected to at least one conductive layer of the carrier substrate at an electrical connection side of the respective power semiconductor prepackage. The electrical connection side is spaced apart from the carrier substrate by a gap. At least a portion of the gap is filled with an electrically insulating material with voids. A peak rated power output of the power electronics converter is greater than 25 kW, and a converter parameter, which is defined as a product of a dielectric strength of the electrically insulating material and a maximum void size, is less than or equal to 10,000 V.

Abstract: An insert fixture for use in the manufacture of a single crystal component by a hot isostatic pressing process. The insert fixture comprising: at least a lower plate separated from an upper plate by interconnecting members. The upper plate comprises at least a slot for the insertion of the single crystal component. The lower plate features a related engagement feature for engaging with the single crystal component. The insert fixture may be cast from a ceramic material. The insert fixture may be cast from an alumina ceramic or molybdenum alloy. The interconnecting members may be made from a molybdenum alloy.

Abstract: An arrangement for cooling at least one power module of a power converter is disclosed herein. The arrangement includes power semiconductor components. The power module is arranged in a drive flow of an engine in such a way that the drive flow flows around cooling ribs of the power module. The disclosure also relates to a power converter, (e.g., an inverter), including an arrangement of this kind and an aircraft, (e.g., an airplane), including a power converter of this kind.

Abstract: A battery module is disclosed, which includes: a multiplicity of battery cells; a printed circuit board with a first series-connector with a first pad area and a second pad area, and a second series-connector with a third pad area and a fourth pad area; a cross-connector, which connects the first series-connector between the first pad area and the second pad area with the second series-connector between the third pad area and the fourth pad area; and a sensor configured to detect a cross-current at the cross-connector. The first contact electrode of a first battery cell is connected with the first pad area. The second contact electrode of a second battery cell is connected with the second pad area. The first contact electrode of a third battery cell is connected with the third pad area. The second contact electrode of a fourth battery cell is connected with the fourth pad area.

Abstract: A gas turbine engine for an aircraft that includes a nacelle, a fan, an engine core, a bypass duct extending between the engine core and the nacelle and guiding a bypass airflow through the bypass duct, and at least one non-structural strut extending in the radial direction within the bypass duct, wherein the non-structural strut includes an outside wall acting as a heat exchanger, and wherein the outside wall includes first transport means configured to transport in the outside wall at least one fluid to be cooled. It is provided that the non-structural strut further includes second transport means configured to transport a fluid to be heated, wherein the first transport means and the second transport means are configured such that the fluid to be heated is heated by the at least one fluid to be cooled and the at least one fluid to be cooled is cooled both by the bypass airflow and the fluid to be heated.

Abstract: A system (1) for vibration management comprises a stator (24, 45); a rotor (26) being mounted rotatably with respect to the stator (24, 45) about a rotational axis (9); one or more active devices (41A-41C) adapted to apply forces and/or moments on the rotor (26) and/or on the stator (24, 45); at least two sensors (42) for measuring vibrational parameter values with respect to two or more different positions, particularly along the rotational axis (9); and a controller (44) adapted to provide control signals to the one or more active devices (41A-41C) based on the vibrational parameter values of the at least two sensors (42) and on the respective position.

Abstract: A pressure regulating valve assembly includes: a valve having an upstream side receiving an input flow and a downstream side providing an output flow, an actuator for opening and closing the valve, including partially opening the valve, and a regulator controlling the actuator to open, close or partially open the valve. The regulator includes a sense pressure port, wherein pressure at the port is maintained constant by the regulator. A chamber has a first entry orifice, a second entry orifice and an exit orifice. The first entry orifice is connected to the upstream side, the second entry orifice is connected to the downstream side, and the exit orifice is connected to the port. The exit orifice provides that the pressure at the exit orifice lies between the pressure at the first entry orifice and the pressure at the second entry orifice.

Abstract: Embodiments of the invention are shown in the figures, where a system for vibration detection is shown, the system comprising: one or more drivelines including a rotatable component rotatable about a rotational axis relative to another component; an electrical machine having a rotor and a stator rotatable with respect to one another, the rotor being arranged to at least one of drive and be driven by a part of the driveline, the electrical machine being adapted to provide signals indicative for at least one of a motion and a force between the rotor and the stator and a torque applied on the rotor; and an analysis unit adapted to receive the signals and to detect a vibration signature of the rotatable component with respect to the other component based on the signals.