Abstract: A system and a method for assisting with troubleshooting a complex system is disclosed in which the troubleshooting procedure can be modeled by a Markov decision process. Combining the fault tree technique with a Markov decision process, in order to determine in an optimal manner the sequence of troubleshooting actions will quickly address the consequences of a failure and ensure maintainability of the complex system.

Abstract: A multilayer thermoformable film to protect the surface of a workpiece includes an underlayer having first and second faces. The underlayer is made from an adhesive material configured to adhere to the surface of the workpiece by the first face. At least one layer of polymer material is attached to the second face of the adhesive underlayer. The layer of polymer material is resistant to erosion by solid particles and to erosion by liquid particles. It is formed from a polymer material chosen from a polyurethane, a polyether ether ketone and a polyethylene having a very high molecular weight, with a Shore D hardness of between 50 and 65 D. A method of surface protection of the workpiece includes thermoforming the film in a shape adapted to match the shape of at least a portion of the workpiece and applying the film thermoformed onto the surface of the workpiece.

Abstract: A part made of a fiber-reinforced composite material includes a structure made from a set of fibers supported in a thermosetting resin and a peel ply across all or part of the outer surface of the structure. The part has a gradient of polymerization at the interface between the structure and the peel ply. Also, methods for making such a part and methods for bonding such parts.

Abstract: A device to correct geometrical differences of surfaces of parts to be assembled at the interface of the assembly. A measurer to acquire data by measuring the geometry of the assembly surfaces of two parts to be assembled to each other with their respective assembly surfaces facing. A simulator configured to simulate the assembly of the parts and to determine from the acquired data at each measured point of a sampling of the interface a thickness of the void resulting from the geometrical discrepancies between the assembly surfaces. An additive fabricator to receive from the simulator data representative of the thicknesses of the voids resulting from the geometrical discrepancies between the assembly surfaces. The additive fabricator configured to deposit material on the assembly surface of at least one of the parts to at least partly fill the void resulting from the geometrical discrepancies between the assembly surfaces.

Abstract: Coatings, for example polymer coatings or sol-gel coatings, including at least one layer of micrometric, individualised and mesostructured spherical particles. The particles having been created and loaded with at least one element selected from corrosion-inhibiting functional molecules and corrosion-inhibiting functional nano-objects, by a method having non-dissociable nebulization-heating steps that are continuous in a single reactor. The coatings form an anti-corrosion system, having mechanical strength and/or for coloring. The coatings are applicable, in particular, in the field of protecting light aeronautical alloys against corrosion.

Abstract: A device which detects and locates an impact on a structure. The device includes at least three acoustic sensors so that an acoustic wave emitted at any point of a measurement space can be received through direct propagation by each of the sensors. The device also includes command controller configured to process the signals corresponding to the acoustic waves received by the acoustic sensors, to detect the occurrence of an impact, and to locate a point of the structure that is the source of an acoustic wave. At least one optical pointer is actuated by the command controller so as to designate an impact point located on the structure by illuminating a corresponding site of the structure.

Abstract: An ultrasound device for checking the quality of a composite material structure during the production cycle. Preferably, the device is incorporated into a production tooling performing the LRI process in which the composite material structure is placed between two molds during the production cycle. A layer of piezoelectric material is deposited on the face of one of the molds, opposite the face which is in contact with the structure. One face of an electrically insulating flexible material film is placed against the outer face of the piezoelectric material layer. The face of the film further includes conductive pads in contact with the piezoelectric material layer. Each pad is energized by electric voltage applied by a conductive strip. Each pad forms an independent ultrasonic transducer with the region of the piezoelectric material layer opposite of its placement.

Abstract: A conductive device to form electrical connections on the surface of a structure made of composite material. The device includes a thin interface layer having a face via which the device is fixed to the surface of the structure made of composite material. A conductive metal element is placed on the face of the interface layer opposite the face making contact with the surface of the structure. The conductive element is configured to be able to undergo tensile and compressive stresses without damage. A protective layer is configured to protect the conductive element from attack from the environment surrounding the structure. These various elements are arranged relative to one another such that the length of the conductive element can vary as a function of temperature variations independently of the amplitude of the variations undergone by the structure on which the device is mounted.

Abstract: A computer-assisted design method for a second three-dimensional object from a first three dimensional object known only by its boundary surfaces, through a surface model of the B-Rep type, of the planar, cylindrical, cone, sphere, or toroid type, excluding free forms in defining the boundary of the object. The first object is broken down into a set of simple volume primitives. The first object is associated with a construction graph defined from these volume primitives and a set of geometric parameters for using these volume primitives in the specific case of that first object. The construction graph enables a compact description of all of the construction alternatives of the object through Boolean combinations of these primitives. The second object is generated as an alternative of the first object according to that construction graph, by modifying some of these parameters.

Abstract: A method for optimizing the tolerancing of a set of flexible parts subjected to forces. At the design phase, an optimum tolerancing for flexible parts is defined according to the assembly process plan and the desired functional requirements. The structural digital models are considered as parts to be assembled and composed of a plurality of assembly points, a plurality of structural points, and mathematical relations or mechanical stiffness, such as a non-null relative displacement of a structural/assembly point in relation to the other structural/assembly points in a single digital model, modify tensor in each structural/assembly point. From a mechanical point of view, these mathematical relations express the existence of an elastic recovery property between the points that make up the digital model. The issue of optimization is simplified by: the definition of influence factors; the simulation of parts deviating from the nominal by a distortion vector.

Abstract: An electromechanical machine includes at least one coil made from a material that becomes electrically superconducting when its temperature is below a critical temperature. A functional part is contained in an internal volume of a thermally insulating and fluid-tight enclosure of the machine. A wall of the insulating enclosure is traversed in a fluid-tight fashion by at least one shaft for transmitting mechanical power between the functional part located in the internal volume of the insulating enclosure and a space outside the insulating enclosure. The functional part can be used as a heat sink, pre-cooled to maintain the temperature conditions for maintaining superconductivity inside the insulating enclosure.

Abstract: An electric cabinet provided with an interconnection system for devices such as computers received in the cabinet. The interconnection system includes at least one waveguide forming part of the frame of the cabinet. The waveguide is provided with openings disposed facing housings for receiving the aforementioned devices. The openings being dimensioned to form a barrier to the passage of radio-frequency wireless communication waves to be transmitted through the waveguide and to form a barrier to external waves.

Abstract: A process for marking the real position and real orientation of a tool in relation to the manipulator arm of a robot. The process utilizes the amplitude measurements of acoustic signals and the flight time measurement of the acoustic waves emitted by an acoustic probe of the tool and reflected by the fixed reference elements. The position of the center of reference of the probe relative to the end of the manipulator arm is determined. The axes X and Y defining the plane of the probe along reference axes X? and Y? of known orientations are oriented so that the modification of the position and of the orientation of the probe in the reference frame can be defined. The displacements of the manipulator arm are managed by the controller based on the position of the probe in relation to the manipulator arm and the reference orientation of the probe.

Abstract: A method for projecting information issued from a digital design model. Calibration is performed by acquiring characteristic data originating from a surface of interest and comparing the characteristic data with virtual data issued from the digital design model. A spatial position of a projecting device is determined. The projecting device comprises a video projector and at least two separate image-capturing devices. Depending on the spatial position, information issued from the digital design model is projected by the video projector onto the surface of interest.

Abstract: A device for absorbing kinetic energy for an aircraft structural element undergoing a dynamic impact. The device includes an outer enclosure made from a braided composite material configured to preserve its integrity after an impact, and a foam core contained in the outer enclosure and to at least partially fill the outer enclosure. The foam core configured to at least partially absorb the kinetic energy generated by the impact. Reinforcing elements include at least one dry composite fiber preform integrated into the foam core to dissipate, in combination with the foam core, the kinetic energy generated by the impact. A method for integrating the device for absorbing kinetic energy.

Abstract: A device for visually inspecting the external surfaces of an aircraft includes an inspection area to receive an aircraft, at least one visual inspection robot, and a control center. A movable platform of the robot supports a turret having an observation unit. The robot includes a processing unit which guides the movable platform and process the data received from the observation unit. The processing unit of the robot are configured to autonomously control the robot during the visual inspection of the external surfaces of the aircraft parked in the inspection area; to interrupt a visual inspection in the event of a detection of an anomaly on the external surface of the aircraft; to transmit a visual inspection data to the control center; and to receive instructions from the control center.

Abstract: A device for testing a stiffener of an aircraft structure made from composite materials. At least one ultrasound sensor is configured to provide measurements relative to a material health state of the stiffener. The device includes a protective enclosure for housing the ultrasound sensor and a mobile gantry configured to move along the stiffener. The protective enclosure with the ultrasound sensor is mounted inside the mobile gantry. A driver is configured to drive the mobile gantry along the stiffener. A clamper is rigidly connected to the protective enclosure and configured to hold the ultrasound sensor pressed against the surface of the stiffener to be controlled. A locator to synchronize each area of the surface of the stiffener with the measurement of the ultrasound sensor.

Abstract: A method for coating a surface comprises applying a layer of coating composition onto the surface, mechanically forming parallel ribs on the layer, and simultaneously polymerizing the layer with ultraviolet radiations. The coating composition comprises a mass percentage of urethan-acrylate oligomer, with an average molar mass in number between 1000 and 5000 g·mol?1, between 35% and 75%. The coating composition further comprises a mass percentage of a diluting agent, copolymerizable with urethan-acrylate oligomers, between 15% and 60%, and a mass percentage of pyrogenic silica between 0.5% and 5%.

Abstract: A drive system of at least one rotor of an aircraft via electrical energy in addition to or as a replacement of a mechanical system. The electrical energy is provided at least in part by at least one device for recovering thermal energy from hot gases of an internal combustion engine of the aircraft.

Abstract: A process for fabricating a partially polymerized prepreg material. Fibers are impregnated with thermosetting resin. The resin is partially polymerized to a degree of polymerization between 10% and 60%. The thermosetting composite parts are produced by drape forming of the prepreg material. The material laid-up in the form of tapes and heated at a temperature above the glass transition temperature of the prepreg state. The laid-up material is pressed and cooled to return the laid-up material to a temperature below the glass transition temperature of the prepreg state in question.