Abstract: Thermal protection material coating of an aggregate of mineral fibers, in particular carbon or silicon, is provided with at least one coat of a silicon-based material covering at least the area exposable to the flaking or crumbling sources of the thermal protection device. The coating is especially applicable to thermal protection structures.

Abstract: Machine is provided for the simultaneous laying down/winding of a plurality of rovings, including a gantry supporting a laying down/winding head carrier mechanism plate movable along the X,Y,Z directions, at least one laying down/winding head rotatably mounted on the mechanism plate around at least one vertical axis and comprising a laying down/winding roller, a mechanism for presenting on the roller rovings along at least two tangent laps, selective mechanisms for driving and cutting each roving, and spools delivering the rovings. The spools are mounted on a fixed creel and the rovings are guided between the creel and the head by sets of return pulleys disposed in such a way as to limit the surface scanned by the rovings and reduce the jerks of the roving reeling speed. The machine is especially adapted for production of composite structures.

Abstract: The present invention relates to a device generating a hot air flow, including an air source generating an air flow at its outlet (17), a heating system (13) generating heat energy and heat-exchange elements (27) capable of storing heat energy generated by said heating system (13) and of yielding this heat energy to said air flow.According to the invention, said heating system (13) and said air source are mounted fixed, and said heat-exchange elements (27) are arranged on a mobile support (3) capable of continuously renewing the heat-exchange elements (27) arranged in said air flow and previously heated by said heating system (13).

Abstract: The combustion chamber of the ramjet is mounted on a support which allows partial freedom of longitudinal movement. A nozzle is arranged at the intake of the combustion chamber, with a flexible, fluid-filled bladder being disposed between the nozzle and the combustion chamber. Air is blown into the combustion chamber through the nozzle, and fuel is fed into the combustion chamber to achieve combustion. The pressure of the fluid in the bladder is measured.

Abstract: Method for embodying hollow articles made of composite material including at least one access orifice via winding/laying down fibers on an expansible mandrel, the resulting articles and a recoverable and removable mandrel. The method includes placing preimpregnated fibers on an expansible, extractable mandrel having a longitudinal axis by at least one of winding and laying down the preimpregnated fibers on the mandrel, the placing of circumferential fibers of the preimpregnated fibers comprising placing the circumferential fibers at an angle to approach or reach 90.degree. with respect to the longitudinal axis and to form on the mandrel a sinuous line and/or plural, discontinuous elements, so as to enable the preimpregnated fibers to be expanded circumferentially during radial expansion of the mandrel; and expanding the mandrel inside a shaper while polymerizing the preimpregnated fibers.

Abstract: Maintenance aid device (1) for a plasma torch (2) affected by a breakdown, comprising an expert system (3) successively determining subassemblies (4) of said torch (2), of decreasing size, likely to contain the brokendown element, by means of questions (QU) relating to the state of certain subassemblies (4), the response to these questions (QU) by an operator (14) being facilitated by the fact that said maintenance aid device (1) includes addressing means (10) able to read from a documentary base (8), and to display, information relating to a determined subassembly (4).Maintenance of complex plasma torches and use of a unique knowledge structure of the latter for other expertise besides breakdown repair.

Abstract: Method for laying filaments on a convex axisymmetric surface, especially a hemispherical surface, provided with a circular hole or a dead zone centered on the pole, wherein a regular set of points are defined on a reference circle of the surface, the filament being laid along a geodesic path from one first departure point to one first arrival point on the reference circle, the same laying process being reproduced for a second pair of departure and arrival points so as to lay a set of filaments (so-called a lap) and then the same laying process is repeated via successive shifts until each point of the reference circle is at the same time and solely a single departure and arrival point, so as to obtain a layer, and possibly restarting the process until the desired thickness is obtained.

Abstract: A method for producing a connecting rod, particularly a monoblock composite connecting rod, by placing preimpregnated fibers on an extractable mandrel, with the following successive stages. Embodying on a rigid central shaft a meltable mandrel with a shape corresponding to that of the connecting rod; winding and/or laying down the preimpregnated fibers according to a predetermined number of layers and an inclination of the fibers with respect to the longitudinal axis of the mandrel; polymerization with a homogeneous compacting pressure being applied to the entire outer surface of the unit; and then final operations for removing the mandrel and machining to required dimensions of the connecting rod.

Abstract: A device for measuring a physical quantity by time-division coding includes a source (1) capable of generating light pulses; a coder (2), the position of which depends on the value of the physical quantity, a sensor (4) including apparatus (5) for sending the light pulses to the coder (2) and a receiver (6) for receiving the coded light pulses, and an analyzer (7) for analyzing the coded light pulses connected to the sensor. The source (1) is capable of generating light pulses simultaneously at two different wavelengths (.lambda.1, .lambda.2), and the sensor (4) is provided with apparatus (9a) for separating the light pulses on the basis of their wavelength, the light pulses at a first wavelength (.lambda.1) passing through the sensor (4) and being coded, while the light pulses at a second wavelength (.lambda.2) are returned to the analyzer (7) to constitute pulses for triggering the sensor.

Abstract: A device for the nondestructive testing of riveted junction sections or the like contains at least one electric type detection probe movable along the junction sections and a memory containing, for each junction section, its specific structure and, for each specific junction section structure, the operational setting to be applied to the probe. A microprocessor uses the contents of the memory for controlling the probe as a function of the specific structure of the junction section being examined.

Abstract: Vessel for storing a fluid under pressure, such as a gas storage vessel, of the type comprising an internal casing surrounded by an external hooping. The internal casing has symmetry about a longitudinal axis, a central pipe section and two extremity portions, and at least one of the extremity portions protruding outwardly. The hooping is of reinforcing fibers coated with a thermoplastic of thermosetting binder, and opposite the pipe section the hooping has at least one layer of fibers, known as longitudinal fibers, having a flat winding pattern and a winding angle as small as possible, so as to allow a boss, centered on the longitudinal axis of the protruded extremity, to be uncovered with fibers. Further, the hooping has at least one layer of fibers, known as circumferential fibers, having an almost 90.degree. winding angle. Moreover, the pipe section further comprises at least one layer of fibers having a winding pattern that is either flat or helical with a winding angle (.alpha..sub.

Abstract: Device for estimating, at high temperature, the electromagnetic properties of a material, including:an oven (1, 19, 20);a waveguide (3) disposed at least in part in said oven, a housing for a specimen piece of uniform thickness made of said material, this specimen piece being such that, when it is disposed in said housing, its outer periphery matches the inner surface of the waveguide;means (4, 5, 6) for applying an incident very high frequency electromagnetic wave to the waveguide (3); andmeans (4, 5, 6) for collecting the electromagnetic wave reflected by said specimen piece.A vertically disposed waveguide has (3) said housing provided at the open lower end (3B ).

Abstract: A detector system for a roll-stabilized aircraft includes a hollow rotatable toroidal ring within which a suitable sensor such as a TV sensor is fixed. The sensor observes the exterior of the aircraft through an observation window in the outer peripheral wall of the ring, which can be rotated about the roll axis of the aircraft. The apparatus includes appropriate instrumentation for determining the position relative to the aircraft of an object detected by the sensor.

Abstract: A device for protection against fire (G3), comprising a flexible body (A3) of material with endothermic properties, comprising a filler releasing vapor under the effect of fire.According to the invention this device comprises, on at least that face of said body intended to be directed towards the fire, at least one layer (E3) of a fabric consisting of fire-resistant fibers and impregnated with an intumescent agent.

Abstract: A method for connecting the screen of at least one screened electrical cable to an electrical link wire includes stripping insulation from the cable and the link wire, coating at least one of the stripped parts of the cable and of the link wire to be connected with an electrically conductive adhesive, after which the parts to be connected are placed facing each other. A tape of heat-shrinkable insulating material is then wound around the parts, and heat-shrunk to form the desired connection.

Abstract: A three-input signal selector formulates two output signals from three input signals. The selector is useful in pollers of various types.

Abstract: Device intended to determine the portion of a field seen by the eye (5) of an observer.According to the invention, this device includes:an optical sighting system (2, 3) through which said eye (5) looks at said field, said optical system comprising an exit eyepiece (15) behind which said eye (5) is placed; anda first optical component (22) placed on the side of the object focal plane of said exit eyepiece (15), said first optical component letting through the light rays (16) which come from said field and which pass through said optical sighting system and sending to said eye (5) a light beam (24) emitted by a light source (23) in order to form at least one reflection.

Abstract: In a method and device for determining the stationary position of the line of sight of a video filming device subject to periodic vibrations, the video signal produced by the device is sampled by means of sampling signals coming from a vibration detector detecting the vibrations. The image observed by the filming device is reconstituted using the sampled video signals, and the position of the stationary reconstituted image corresponding to the stationary line of sight is determined from the reconstituted image.

Abstract: A method for harmonizing an equipment relative to a vehicle, such as a helicopter, based upon sensing of the gravitational field in a number of reference systems. The equipment is installed fixedly on board the vehicle which, relative to a first absolute reference system (RM), has an orientation defined by a second reference system (R2) tied to the vehicle. The equipment is subjected to the earth's gravitational field represented by a gravity vector g oriented along its gradient. The orientation of the equipment is defined, relative to the first absolute reference system (RM), by a third reference system (R3). The equipment includes a device for measuring the components of the gravity vector g, and the vehicle carries a computer, a memory associated with the computer; and a link connecting the equipment to the computer and to the memory. The gravitational field is measured when the vehicle is in a number of different orientations, and the equipment is harmonized to the vehicle based thereon.

Abstract: The present invention relates to a device for elastic connection between two components in order to transmit the static forces from one to the other in the axis of the device and to filter the associated vibratory excitations, comprising an elastic return mechanism (4) connected to a first and a second component and at least one swinging mass (5) located at one end of a lever arm, the lever arm articulated, in the vicinity of its other end, on the first and second components. The lever arm (6) consists of at least two portions (7, 8) articulated on one another, the first portion (7) being articulated on the first (2) and second (3) components in the vicinity of its end (7a) opposite that (7b) articulated on the second portion (8), and the second portion (8) being articulated, in the vicinity of its end (8a) articulated on the first portion (7), on the second component (3) and carrying the mass (5) at its opposite end (8 b).