Abstract: A method for producing a nitrided steel part in which a semi-finished blank made of nitriding steel is produced from a blank or a steel bar and in which a reinforcing treatment is carried out on the semi-finished blank thus obtained, the method including a preliminary heat treatment in which the blank or steel bar from which said semi-finished blank is obtained is heat-treated beforehand. The preliminary heat treatment includes a hardening treatment by a heating which ensures austenitization of the steel and a tempering treatment at a temperature between 200° C. and 650° C. A surface induction hardening is performed on the semi-finished blank prior to a step of shallow nitriding, the step of shallow nitriding being carried out for a period of less than 250 hours, at a temperature of between 400° C. and 600° C.

Abstract: An acoustic panel for an aircraft turbomachine. The acoustic panel includes a first skin formed from a first composite material having a first polymer matrix and reinforcing fibers embedded in the matrix, a second skin formed from a second composite material having a second, thermoplastic polymer matrix and reinforcing fibers embedded in the second matrix, and a core having a honeycomb structure The core can be arranged between the first skin and the second skin, and the second skin can contain holes having a diameter less than 1 mm.

Abstract: A component made from nickel-based superalloy powder consisting of, by mass percent, 14.00 to 15.25% chromium, 14.25 to 15.75% cobalt, 3.9 to 4.5% molybdenum, 4.0 to 4.6% aluminum, 3.0 to 3.7% titanium, 0 to 200 ppm carbon, the remainder consisting of nickel and unavoidable impurities.

Abstract: The invention relates to a method for detecting a defect (DEF) in at least one gear of an aircraft turbomachine based on a vibratory signal (s(n)) of the gear, each gear having a determined meshing frequency (fc) corresponding to a carrier frequency, the method comprising steps consisting in estimating (E3) a target signal (x(n)) comprising a set of characteristic spectral lines based on a whitened vibratory spectrum (y(n)) obtained from a vibratory signal, the method comprising steps of determining, in the whitened vibratory spectrum (y(n)), a plurality of modulation blocks having a modulation index, each modulation block having a carrier coefficient that is dependent on a predetermined carrier frequency (fc) and on the modulation index and a plurality of modulation coefficients that are symmetric about the carrier coefficient.

Abstract: Method for monitoring the navigation of a vehicle for the implementation of a navigation maneuver, the method including the steps of: estimating a magnitude by a Kalman filter from parameters, a digital model of the vehicle in its environment, and at least one measurement made by at least one sensor and associated with an uncertainty on this measurement, the magnitude serving to implement the navigation maneuver; determining at least one partial derivative value of the magnitude with respect to the at least one measurement; obtaining at least one criticality value of the at least one measurement for the estimation, from the at least one partial derivative.

Abstract: A method for assisting navigation of a mobile system includes obtaining an optical image of a scene acquired by a camera, obtaining a 3D point cloud of the scene acquired by a range-finder, projecting, in 2D into a reference frame of the camera, the 3D points of the 3D point cloud and a measurement uncertainty to provide a depth image and an uncertainty mask of the depth image, determining a semantic map, a depth map and a confidence map of the depth map from the optical image by processing the optical image, the depth image and the uncertainty mask a first convolutional neural network which includes a succession of convolutional layers, each including first to third convolution blocks that estimate respectively a semantic attribute map, a depth attribute map and a confidence attribute map, and determining a scene traversability map by merging the semantic, depth, and confidence maps.

Abstract: A method for making an acoustic component includes a plurality of hollow complex acoustic elements, the method including heating a film of thermoplastic material to a first temperature above the glass transition temperature of the film; shaping the heated film of thermoplastic material in a tool including a mould which has a plurality of mould cavities having a shape corresponding to the shape of the complex acoustic elements of the acoustic component to be made, the heated film of thermoplastic material being shaped locally in each of the mould cavities, at least the mould being kept at a second temperature above the glass transition temperature of the thermoplastic material; cooling the mould; and removing a complex acoustic multi-element panel including a plurality of hollow complex acoustic elements from the mould.

Abstract: A casing of a turbine engine compressor including an inner annular wall and an outer annular wall delimiting therebetween an annular cavity. The inner annular wall includes a plurality of slots hollowed out in the thickness of the wall, the slots being arranged next to one another in a circumferential direction and each extending in an axial direction. The casing further includes a sliding ring present in the annular cavity of the casing. The sliding ring is movable in the axial direction between an open position in which the slots in the inner annular wall of the casing open into the annular cavity and a closed position in which the sliding ring covers at least some slots.

Abstract: The invention relates to an acoustic attenuation structure comprising a lower multicellular structure and an upper multicellular structure, at least part of the cells of the upper multicellular structure opening out at least partially into one or several cells of the lower multicellular structure, the acoustic attenuation structure being characterized in that a hollow acoustic element having a shape gradually tapering between a base and a top is present in each cell of at least part of the lower multicellular structure.

Abstract: A facility for pairing a metal shield to a leading edge of a preform made of composite material for the production of an aircraft turbine engine blade, the facility including a support configured to receive and hold the metal shield, —a movement hexapod which carries the support and is able to move the support along and about the three axes of an XYZ coordinate system, —an automaton which includes jaws and is configured to receive and hold the preform, and —a computing unit for controlling the hexapod and the automaton with a view to producing the pairing. The invention also relates to a method for pairing the metal shield to the leading edge of the preform made of composite material for the production of the aircraft turbine engine blade.

Abstract: A titanium alloy includes, in content by weight 4.0% to 5.0% aluminium; 3.50% to 4.50% tin; 1.0% to 4.0% zirconium; 2.0% to 5.25% molybdenum; 1.0% to 2.50% niobium; 0.10% to 0.25% silicon; 0.10% to 0.18% oxygen; the remainder being titanium and unavoidable impurities, the alloy further being such that the Aleq criterion, referred to as equivalent aluminium content by weight, is less than or equal to 8.5%, the Aleq criterion being defined as Aleq=[Al]+[Sn]/3+[Zr]/6+10*[O] where, [Sn], [Zr] and [O] are the contents by weight of aluminium, tin, zirconium and oxygen respectively.

Abstract: Disclosed is a variable pitch vane for a turbomachine fan comprising a blade (60) and a root (62). The root (62) comprises a bulb (72) and a stalk (74) connecting the bulb (72) to the blade (60), the bulb (72) being connected to the stalk (74) by a neck (82) defining a local minimum of the cross-section of the root (62) along a plane orthogonal to the pitch axis. At least one segment of the root (62) including the neck (82) and at least a portion of the stalk (74) comprises a surface layer and an inner layer between the pitch axis and the surface layer, the inner layer having a stiffness strictly greater than the stiffness of the surface layer.

Abstract: A navigation assistance method for a mobile carrier including an inertial navigation unit, at least one inertial sensor, an estimation unit performing steps of: parametrization of a non-linear system configured to estimate a navigation state of the mobile carrier over a given time interval at an iteration n as a function of a kinematic model and/or measurements; linearization of the system so that the system expresses a navigation state at iteration n as a function of the state at iteration n?1 and a correction to this navigation state; estimating a first correction of a navigation state at iteration n; estimating a second correction of the navigation state at iteration n; determining a third correction by merging the first and second corrections; and correcting the navigation state at iteration n as a function of the third correction, the corrected state being used at iteration n+1.

Abstract: A device for laser heating of a mechanical part of the turbine blade or turbine blade element type, including: one or more laser emitters, for respectively emitting at least a first laser radiation at a first predetermined power towards a first target area of the part and for emitting a second laser radiation at a second predetermined power towards a second target area of the part, different from the first target area, the second predetermined power being different from the first predetermined power.

Abstract: A method includes coating of one or more zones of the refractory alloy part, using a treatment composition including one or more types of preceramic polymer, a solvent and one or more active fillers, and heat treating the coated refractory alloy part, the heat treatment allowing to partially convert the preceramic polymer to form a ceramic layer, the active filler forming on a surface of the refractory alloy part, one or more ternary alloys and forming a continuous layer between the surface of the refractory alloy part and the ceramic layer obtained by conversion. The heat treatment forms a continuous layer of the ternary alloy. The treatment composition includes, relative to the total weight of the treatment composition, a weight proportion of between 40% and 66% of the one or more active fillers, and an active filler/preceramic polymer weight ratio is greater than or equal to 2.

Abstract: A method includes receiving an operating setpoint for an electrical power source, receiving a measurement of a voltage of an electrical bus connecting the electrical power source to an electrical receiver, comparing the measurement of the voltage with a template having limits of change over time for the voltage, and controlling the electrical power source such that if the measurement of the voltage lies within the limits of the template, the electrical power source applies the operating setpoint, and if the measurement of the voltage lies outside the limits of the template, the electrical power source regulates the voltage so as to restore the voltage to within the limits of the template. The method is implemented by a controller of the electrical power source.

Abstract: The invention relates to a conditioning system (SC) for fuel (Q), which is configured to supply an aircraft turbine engine (M) with fuel (Q) from a cryogenic tank (R), the conditioning system (SC) comprising at least one first heat exchanger (31) configured to heat the flow of fuel (Q) to a circulation temperature (Te), at least one second heat exchanger (32) configured to heat the flow of fuel (Q) to an injection temperature (Ti), a distribution valve (4) configured to divide a direct fuel flow (Q1) and a recirculated fuel flow (Q2), configured to circulate in a recirculation branch (12) so as to reheat the main fuel flow (Qp) in the first heat exchanger (31) by means of the recirculated fuel flow (Q2).

Abstract: A casing of a turbine engine compressor including an inner annular wall and an outer annular wall delimiting therebetween an annular cavity. The inner annular wall includes a plurality of slots hollowed out in the thickness of the wall, the slots being arranged next to one another in a circumferential direction and each extending in an axial direction. The casing further includes a sliding ring present in the annular cavity of the casing. The sliding ring is movable in the axial direction between an open position in which the slots in the inner annular wall of the casing open into the annular cavity and a closed position in which the sliding ring covers at least some slots.

Abstract: A method for focusing acoustic waves on an interface between two layers of a multilayer structure includes providing laser means able to emit a laser beam toward an exterior surface of the multilayer structure to produce a longitudinal wave from the centre of a laser-beam spot projected onto the exterior surface and a transverse wave from the periphery of said spot, determining the distance between said interface and the exterior surface, determining one or more propagation velocities of each of the longitudinal wave and the transverse wave in the one or more layers passed through by said waves to reach said interface, and determining a radius of the laser-beam spot depending on the one or more propagation velocities and on said distance so that the time taken by the longitudinal wave to reach said interface is equal to three times the time taken by the transverse wave to reach said interface.

Abstract: A tracer strand for the weaving of a composite material part reinforcement, the tracer strand including one or more carbon yarns twisted with one or more yarns of a material having a color contrasting with the color of the carbon yarns, the yarns being twisted together according to a twist included between 10 turns per meter and 80 turns per meter.