Abstract: A method for determining a fault for a set of sensors, comprising: obtaining data, said data comprising a plurality of measurements returned respectively by the sensors and a plurality of estimates determined respectively by a plurality of estimators taking as input different subsets of said measurements, at least one of the estimators comprising an artificial neural network; calculating residuals representative of the deviation between data representing the same physical quantity; determining that there is a fault on at least one of the sensors as a function of the residuals calculated based on data obtained from measurements returned by said sensor.

Abstract: This disclosure relates to a method for chilling down a cryogenic fluid supply circuit comprising a step of acquiring a state value of the cryogenic fluid supply circuit at a current time, a step of computing a corresponding opening time of each out of one or more valves of the cryogenic fluid supply circuit, and a step of opening each valve at the corresponding time to chill down the cryogenic fluid supply circuit. The step of computing is carried out by a computer applying an artificial neural network to compute a sequence of opening of the valves making it possible to reach, starting from the state value of the cryogenic fluid supply circuit at the current time, a state of the cryogenic fluid supply circuit meeting one or more predetermined chill down criteria at a predetermined time in the future.

Abstract: A method of controlling a multi-engine bay in which the following steps are performed: a) controlling the bay so that it delivers desired thrust and each engine is operated in compliance with a set of operating limits for the engine; b) periodically evaluating a level of damage for each of the engines, the level of damage of an engine being information representative of a probability of the engine failing; c) for each engine, periodically evaluating whether its level of damage exceeds a predetermined value; and d) if the level of damage of an engine, referred to as a “damaged” engine, exceeds a predetermined value, modifying at least one operating limit of the damaged engine so that the rate of damage of the damaged engine is less than a predetermined maximum rate of engine damage.

Abstract: A thermal regulator system (10) for a fuel cell (12), the system comprising a passive pump member (14) having a first inlet (14a) connected to a first pipe (16), a second inlet (14b) connected to a second pipe (18), and an outlet (14c) configured to be connected to a cooling circuit (20) of the fuel cell (12), the passive pump member (14) being configured to use the Venturi effect to drive a fluid flow along the second pipe (18) by means of a fluid flowing along the first pipe (16). The first pipe (16) and the second pipe (18) are configured to be connected to an outlet of the cooling circuit (20) of the fuel cell (12), the first pipe (16) and the second pipe (18) being configured to feed the passive pump member (14) with fluids at different temperatures.

Abstract: A field of feeding propellant gas to ion thrusters, and in particular a method of feeding an ion thruster with propellant gas coming from a pressurized tank via a feed circuit including an on/off valve and, in succession downstream from the on/off valve, a high pressure restrictor, a buffer tank, and at least one low pressure restrictor. The method includes the steps of calculating a pressure setpoint for the buffer tank as a function of a flow rate setpoint, calculating the difference between the pressure setpoint for the buffer tank and a pressure measured in the buffer tank, calculating a setpoint for the opening time of the on/off valve as a function of the difference and of a pressure inside the pressurized tank, and opening the on/off valve in compliance with the opening time setpoint.

Abstract: The invention relates to the field of technical testing, and more particularly to a method of testing a machine, the method comprising: at least one step (S101) of determining a plurality of operating points for said machine, each operating point being defined by a duration and a specific value of at least one operating parameter of the machine; a step of calculating a set of distances between pairs of operating points; a step (S106) of selecting an optimum sequence of operating points by applying an algorithm for solving the traveling salesman problem to said set of distances between pairs of operating points; and a step (S107) of controlling the operation of said machine according to said optimum sequence of operating points.

Abstract: A method of characterizing a signal, the method including acquiring a signal; and determining a vibration rating of a portion of the signal; determining a level of variation of a portion of the signal; and determining information characterizing the signal by applying a function that takes as arguments the vibration rating and the level of variation.

Abstract: A state monitor for monitoring the state of a system and including a calculator and a memory; the system being controlled by a command defining a plurality of modes of operation of the system, each mode of operation corresponding to applying a command of constant value; the memory containing a set of stored state matrices representing, for each mode of operation of the system, the value of the projection of its state in time; and the calculator being configured, during operation of the system, to determine estimated values for the state of the system at a given instant with the state functions and of its state at an earlier instant.

Abstract: A thermal regulator system (10) for a fuel cell (12), the system comprising a passive pump member (14) having a first inlet (14a) connected to a first pipe (16), a second inlet (14b) connected to a second pipe (18), and an outlet (14c) configured to be connected to a cooling circuit (20) of the fuel cell (12), the passive pump member (14) being configured to use the Venturi effect to drive a fluid flow along the second pipe (18) by means of a fluid flowing along the first pipe (16). The first pipe (16) and the second pipe (18) are configured to be connected to an outlet of the cooling circuit (20) of the fuel cell (12), the first pipe (16) and the second pipe (18) being configured to feed the passive pump member (14) with fluids at different temperatures.

Abstract: A method of regulating pressure within a first propellant tank of a rocket engine having a first propellant tank containing a first propellant and a second propellant tank containing a second propellant, and a regulator device for regulating pressure within the first tank, the regulator device comprising a gas generator and a heat exchanger co-operating with the gas generator so as to vaporize at least part of the first propellant prior to reintroducing it into the first tank (16), the gas generator and the heat exchanger both being fed with the first propellant by a single first motor-driven pump, while the gas generator is fed with the second propellant by a single second motor-driven pump, wherein the flow rate of the first motor-driven pump is controlled as a function of a first parameter, while the flow rate of the second motor-driven pump is controlled as a function of a second parameter.

Abstract: An information processor system for monitoring a complex system and including a mechanism receiving at least one piece of event detection information associated with a detection time and a mechanism generating at least one remanent confidence level value that decreases over time starting from the detection time.

Abstract: A field of test methods, and more particularly to a method for testing a device, the method including one operating stage corresponding to a stable value of one operating setpoint for the device and/or for a test bench for testing the device. The operating stage is finalized before a maximum duration threshold if a criterion associated with a set of physical parameters picked up during the operating stage is satisfied and if a confidence level associated with the set of physical parameters reaches at least a predetermined threshold.

Abstract: A method of making safe operation of a rotary assembly of a turbomachine including a turbine and a rotary machine, the method anticipating an event of exceeding a predetermined threshold speed by repetitively performing a prediction cycle including: measuring magnitudes relating to operation of the turbomachine, including real speed of rotation of its rotary assembly; based on the magnitudes, estimating driving and resisting torques applied to the rotary assembly; preparing a representative value representative of the difference between these two torques; and calculating a predicted speed of rotation for the rotary assembly at a given time horizon based on the representative value and the real speed of rotation. An action is taken on the operation of the turbomachine to limit an extent to which its rotary assembly exceeds the threshold speed in the event of the predicted speed of rotation exceeding the threshold speed.

Abstract: An obtaining step for obtaining a measurement of the monitored parameter as measured by a sensor and corresponding to an operating point of the engine, the operating point being defined by at least one regulation parameter of the engine; an estimation step for estimating a value of the monitored parameter for this operating point on the basis of a regulated value or a filtered setpoint value of the at least one regulation parameter of the engine defining the operating point; a comparison step for comparing an error between the measurement of the monitored parameter and its estimate relative to at least one threshold determined on the basis of an uncertainty on the error evaluated for the operating point; and a notification step for sending a notification in the event of the at least one threshold being crossed.

Abstract: An evaluation system for evaluating a flow rate of a fluid coming from a tank, the system including measurement device suitable for measuring a fluid level in the tank and including estimation device for estimating the flow rate of the fluid using an unscented Kalman filter, the estimation device including an obtaining device for obtaining the raw fluid flow rate and correction device connected to the obtaining device and to the measurement device and configured to correct the raw flow rate as obtained by the obtaining device as a function of the level measured by the measurement device. A method performed by such a system.

Abstract: A technical test method for evaluating at least one operating parameter of a device over a sequence of a plurality of operating stages, each stage corresponding to a stable value of at least one operating setpoint of the device. The method including at least sampling values of the at least one operating parameter over time, filtering the sampled values in order to obtain a filtered signal for each operating parameter, calculating the variance of the sampled values for each operating parameter in a sampling window during the operating stage, calculating the absolute value of the time derivative of the filtered signal for each operating parameter, and changing the value of the at least one operating setpoint when, for each operating parameter, the variance of the sampled values and the absolute value of the time derivative of the filtered signal are less than respective predetermined lower thresholds.

Abstract: The invention relates to the field of technical testing, and more particularly to a method of testing a machine, the method comprising: at least one step (S101) of determining a plurality of operating points for said machine, each operating point being defined by a duration and a specific value of at least one operating parameter of the machine; a step of calculating a set of distances between pairs of operating points; a step (S106) of selecting an optimum sequence of operating points by applying an algorithm for solving the traveling salesman problem to said set of distances between pairs of operating points; and a step (S107) of controlling the operation of said machine according to said optimum sequence of operating points.

Abstract: A state monitor for monitoring the state of a system and including a calculator and a memory; the system being controlled by a command defining a plurality of modes of operation of the system, each mode of operation corresponding to applying a command of constant value; the memory containing a set of stored state matrices representing, for each mode of operation of the system, the value of the projection of its state in time; and the calculator being configured, during operation of the system, to determine estimated values for the state of the system at a given instant with the state functions and of its state at an earlier instant.

Abstract: The measurement system having multiple sensors for sensing the same physical magnitude comprises at least one set of n redundant sensors or of models representing the same physical magnitude in order to deliver n measurement signals, a fusion unit for performing fusion that is the result of multiplexing the n measurement signals in order to deliver a single multiplexed output signal resulting from the fusion of the n measurement signals, and a reconditioned UKF receiving the multiplexed output signal to output a signal constituting the best estimate of the measurement of the physical magnitude after rejecting signals representative of a sensor failure.

Abstract: A data processor system for monitoring a complex system, the processor system configured to receive a plurality of pieces of state information and to merge at least the pieces of state information into a piece of failure information, at least one of the pieces of state information being associated with a confidence flag, and the piece of failure information also being associated with a confidence flag. The system performs the merging by implementing a fuzzy logic technique to produce the piece of failure information while taking account of the respective confidence flag of the pieces of state information and to produce the confidence flag associated with the failure information.