Capability evaluation method for thrust descending fault of low-thrust engine

Abstract

The invention discloses a capability evaluation method for a thrust descending fault of a low-thrust engine. The capability evaluation method comprises the following steps: (1) calculating the residual degree D of the axial thrust of an engine; (2) performing fault severity grading judgment on the residual degree D of the axial thrust of the engine; (3) predicting and calculating the remaining flight time ts; (4) calculating theoretical residual flight time tsl; and (5) comparing the remaining flight time ts with the theoretical remaining flight time tsl. According to the capability evaluationmethod, for the small-thrust engine, the shutdown amount information within a certain time period is used for carrying out capacity evaluation, and the influence of quantization errors, inertial measurement unit tool errors and other interference on capacity evaluation is eliminated, and the evaluation accuracy is improved.

Description

technical field [0001] The invention belongs to the field of guidance and control systems, and in particular relates to a capability evaluation method for thrust drop faults of small thrust engines. Background technique [0002] The small-thrust engine is generally used in the terminal speed correction section of the rocket to precisely control the orbital speed of the rocket and realize the precise entry of the rocket into the predetermined orbit. During the flight of the rocket, if the catalyst performance of the engine fails, etc., it will lead to a thrust drop failure, which will affect the accuracy of the rocket’s orbit. It provides a basis for subsequent change control strategies and accurate orbitalization. [0003] There is currently no capability assessment for the thrust drop failure mode of small thrust engines. The method utilizes the control system's own information, does not need to use external system information, and can be realized only by modifying the fl...

AI Technical Summary

Problems solved by technology

During the flight of the rocket, if the catalyst performance of the engine fails, etc., it will lead to a thrust drop failure, which will affect the accuracy of the rocket’s orbit. Provide a basis for subsequent change control strategies and achieve accurate orbiting

[0003] there are no capability assessments for low thrust engine thrust drop failure modes

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