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

An aircraft power system and dynamic fault tree technology, which is applied in the field of aircraft power system safety analysis, can solve the problems that cannot be used to describe system dynamic rules and timing failure behavior, and achieve the effect of reducing the probability of accident

Active Publication Date: 2018-11-27
CIVIL AVIATION UNIV OF CHINA
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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.

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

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Embodiment Construction

[0026] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0027] The design idea of ​​the aircraft power system safety analysis method based on dynamic fault tree and Markov of the present invention is to set up the dynamic fault tree model of the aircraft power system according to the aircraft power system structure; according to the dynamic fault tree model of the aircraft power system established , determine the state transition diagram of the Markov model of the aircraft power system; determine the state transition probability formula according to the working principle and internal logical relationship of the aircraft power system; according to the established state transition probability formula, establish the state transition matrix and its corresponding Differential equation; Substituting the initial conditions and using Laplace transform to obtain a linear equation system; solving the linear equ...

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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...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G07C5/08G07C5/00G06F17/50
CPCG07C5/006G07C5/0808G06F30/20
Inventor 杨占刚黄加旺卜兆文刘建英石旭东
Owner CIVIL AVIATION UNIV OF CHINA
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