Abstract: A field of vehicles propelled by reaction, and more specifically to a method of suppressing the pogo effect in such a vehicle. A feed system for feeding a reaction engine of the vehicle includes a hydraulic accumulator enabling a selection to be made from among a plurality of predetermined operating levels, each corresponding to a different volume of gas. In the method, if a first reference criterion is not satisfied by the current level, the hydraulic accumulator is ordered to make a transition, preferably to an alternative level selected from among alternative levels for which the first reference criterion is satisfied and for which no hydraulic resonant frequency crosses any current mechanical resonant frequency during the transition.

Abstract: A method of designing a valve presenting an orifice of section that depends on the position of the valve member of the valve, which section can thus be controlled. The method includes determining a desired variation relationship for the flow section of the valve, which relationship defines a desired variation in the section as a function of time; setting a predetermined movement relationship for the valve member; and defining the shape of the fluid flow orifice in such a manner that, at each instant, if the valve member moves in compliance with the predetermined movement relationship, the flow section remains equal to the desired section. The method makes it possible to design a valve that is simple to control.

Abstract: A pressure regulator system (100) for regulating a pressure in a fluid line (16A) in such a manner that the pressure complies with a predetermined regulation criterion. The system comprises a valve (20A) that is controllable in on/off mode arranged at a downstream end of the line (16A) and suitable for oscillating between an open position and a closed position; a pressure sensor (40A) connected to the line (16A) and serving to measure the pressure in the line upstream from the valve (20A); and a regulator unit (50) configured to transmit to the valve (20A) open/close commands that are determined as a function of the measured pressure. A constant frequency imposes open periods (Oi) on the valve. The durations of the open periods are modulated in such a manner that the pressure in the line complies with said predetermined criterion.

Abstract: A method of controlling the pressure (PGC) and a mixture ratio of a rocket engine from a pressure setpoint (PGCc) and from a mixture ratio setpoint (RMc), the method comprising regulation delivering control signals for two control valves (VR1, VR2) of said engine, the regulation using a pressure feedback loop. The method further comprises determining an estimated value for the mixture ratio (RMe) used by said regulation, the estimated value for the mixture ratio being obtained by a model that delivers mixture ratio values as estimated from at least one of the two control valve control signals and/or from the measured pressure. The invention also provides a control device.

Abstract: A field of pneumatically-actuated regulator valves, and more specifically a regulator valve for regulating a flow of gas from an upstream duct to a downstream duct. The regulator valve has a passage to enable the upstream duct to communicate with the downstream duct, a movable member arranged to vary a flow section of the passage, and an actuator with an internal chamber in communication with an exhaust duct and an admission duct to connect to the upstream duct, the actuator being arranged to move the movable member. For control purposes, the regulator valve has a control unit incorporating at least one state observer to estimate at least one pressure that exists in the internal chamber from a measured position of the movable member and from a measured upstream pressure, and from an opening value for at least one valve installed in the admission duct and/or the exhaust duct.

Abstract: A field of vehicles propelled by reaction, and more specifically to a method of suppressing the pogo effect in such a vehicle. A feed system for feeding a reaction engine of the vehicle includes a hydraulic accumulator enabling a selection to be made from among a plurality of predetermined operating levels, each corresponding to a different volume of gas. In the method, if a first reference criterion is not satisfied by the current level, the hydraulic accumulator is ordered to make a transition, preferably to an alternative level selected from among alternative levels for which the first reference criterion is satisfied and for which no hydraulic resonant frequency crosses any current mechanical resonant frequency during the transition.

Abstract: A method for displaying image for the supervision of a device (20) by means of a system comprising a display (14) and cameras (24). The method comprises the following steps: a0) a state parameter of the device is acquired; a1) an active camera is selected; a2) acquired image parameters and synthesis image parameters are determined; b2) a camera image is acquired according to the acquired image parameters; c) a synthesis image of the device is calculated according to the synthesis image parameters; d) the acquired image and the synthesis image are combined realistically to form a supervision image which is displayed. At step a2), the image parameters are determined, and/or at step c), the synthesis image is calculated, and/or at step d), the supervision image is formed, as a function of the state parameter of the device. A supervision system for carrying out the method.

Abstract: A method of designing a valve presenting an orifice of section that depends on the position of the valve member of the valve, which section can thus be controlled. The method includes determining a desired variation relationship for the flow section of the valve, which relationship defines a desired variation in the section as a function of time; setting a predetermined movement relationship for the valve member; and defining the shape of the fluid flow orifice in such a manner that, at each instant, if the valve member moves in compliance with the predetermined movement relationship, the flow section remains equal to the desired section. The method makes it possible to design a valve that is simple to control.