Online single-shot thrust fault diagnosis method for carrier rocket

Abstract

The invention discloses an online single-shot thrust fault diagnosis method for a carrier rocket. The method comprises the following steps: S100, establishing a carrier rocket state equation based onthe attitude kinematics and kinetic equation of the carrier rocket, widening the band identification quantity into the state quantity, and establishing a corresponding number of system state equationsand measurement equations for fault diagnosis of the single-shot thrust of the carrier rocket according to the actual number of the single-shot thrust of the carrier rocket; S200, in the real-time flight process of the carrier rocket / missile, estimating the single-shot thrust of the carrier rocket by using unscented Kalman filtering, and obtaining an estimation error and a covariance matrix; andS300, performing probability matching calculation by using the error and the covariance matrix to realize thrust fault positioning and obtain the output thrust of a faulted engine. The method has theadvantages of being simple in structure, simple in design process, high in convergence speed and high in identification precision, and therefore the method has wide application prospects in carrier rocket single-shot thrust fault diagnosis.

Description

Technical field [0001] The invention belongs to the technical field of aircraft control, and particularly relates to a single-engine thrust fault diagnosis method for a launch vehicle. Background technique [0002] The flight environment of a launch vehicle is very complicated and has high requirements on the power system. The failure of the power system directly affects the strike capability and control performance of the launch vehicle, and seriously affects the reliability of the launch vehicle. Therefore, carrying out the online single-engine thrust fault diagnosis design of the launch vehicle can greatly improve the reliability of the launch vehicle. During the flight, the launch vehicle / missile directly affected the normal operation of the engine due to turbo pump failure, thrust chamber failure, and pipeline valve failure, causing a single-engine engine to lose thrust or shut down directly. On the one hand, the failure of the power system of the launch vehicle directly af...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of online thrust fault diagnosis of launch vehicles during flight, and provide a single-engine thrust fault diagnosis method based on unscented Kalman filter and probability matching

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