Aircraft power supply system safety analysis method based on dynamic fault tree and Markov

Abstract

The invention provides an aircraft power supply system safety analysis method based on combined fault tree and Markov. The method comprises the following steps: establishing a dynamic fault tree modelof an aircraft power supply system according to the structure of the aircraft power supply system; determining a state transition diagram of a Markov model of the aircraft power supply system; determining a state transition probability formula according to the operating principle of the aircraft power supply system and an internal logical relation; establishing a state transition matrix and a corresponding differential equation; transforming the linear system of equations; and solving the linear system of equations, and performing inverse Laplace transform so as to obtain a dynamic fault probability function of the aircraft power supply system, and analyzing the safety of the aircraft power supply system. The method disclosed by the invention has the beneficial effects that the aircraft power supply system can be maintained in corresponding time periods, and the failure probability of the aircraft is greatly reduced; and the method can also be applied to safety analysis of other aircraft types or other systems, and provides reference for reliability analysis and study of each system of the aircraft.

Description

technical field [0001] The invention relates to a method for analyzing the safety of an aircraft power supply system, in particular to a method for analyzing the safety of an aircraft power supply system based on dynamic fault trees and Markov. System dynamic security analysis. Background technique [0002] The aircraft power system is the general term for the generation, adjustment, conversion, control, protection and other parts of the electrical energy on the aircraft, including all links from the generator to the input end of the electrical equipment. As the blood vessels and nerves of the aircraft, the quality of the aircraft power system is related to the quality and flight safety of the entire aircraft. With the development of more electric aircraft technology, the power system gradually replaces the hydraulic, pneumatic and mechanical systems, and the reliability requirements for the aircraft power system are further improved. The research on the reliability of air...

AI Technical Summary

Problems solved by technology

However, the fault tree analysis method can only analyze the static failure probability of the aircraft power system, and cannot be used to describe the dynamic rules and timing failure behavior of the system.

Images