METHOD FOR LOCALIZATION OF MALFUNCTION OF LIQUID-PROPELLANT ROCKET ENGINE DURING FIRE TEST Russian patent published in 2024 - IPC G01M15/14 G05B17/00 

FIELD: cosmonautics.

SUBSTANCE: invention relates to aerospace engineering, particularly, to liquid-propellant engines, and is intended for use in their experimental development, operation and modernization. When fixing the moment of occurrence of the fault, its localization is carried out. For this purpose, deviation of current values of measured parameters from reference values is determined. If any two of these deviations Δ_i and Δ_j are the first to go beyond the limits of their tolerances, the moment of time of the last of them is recorded as the moment of occurrence of the fault. Determining the proportionality coefficient linearizing the system of equations of the mathematical model and determining the reference values of the proportionality coefficient: n = 1, 2,…, N, where N is the number of equations, J_ni, J_nj are the minors of the main determinant of the linearized system of equations of the mathematical model; n is the row number of the determinant corresponding to the number of the equation i, j is the number of the column in the main determinant, corresponding to the numbers of the variables which were the first to go beyond their tolerances. Determine deviations D_n=|E_n−d|. If these deviations are within the specified allowable limits, then according to the numbers n one or several equations corresponding to the motor circuit containing the fault are determined, and the motor is transferred to the shutdown or safe operation mode.

EFFECT: when using the disclosed method, reducing the time spent on computational procedures is achieved due to the fact that when localizing a fault in each control cycle, it is not necessary to solve the system of equations of the mathematical model, which provides localization of liquid-propellant engine failure in real-time testing mode and efficiency of signal generation for engine control elements in case of decision on engine shutdown or transfer to safe mode of operation.

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