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Aircraft complex system task reliability modeling prediction method based on fault tree

A complex system and fault tree technology, applied in the direction of calculation, design optimization/simulation, instrument, etc., can solve the problems of complex system interface relationship, complex cross-linking relationship, inability to guarantee integrity, accuracy consistency, etc., to ensure complete integrity performance, predictable results are accurate

Pending Publication Date: 2021-04-16
JIANGXI HONGDU AVIATION IND GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the increase of the complexity of the aircraft system, the key system has functional reconfiguration design, redundancy design, the cross-linking relationship inside the system is more complicated, and the interface relationship between the systems is complicated, so that this traditional prediction method can no longer guarantee the reliability of complex systems. Requirements for completeness, accuracy and consistency with system design

Method used

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  • Aircraft complex system task reliability modeling prediction method based on fault tree
  • Aircraft complex system task reliability modeling prediction method based on fault tree
  • Aircraft complex system task reliability modeling prediction method based on fault tree

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Taking the mission reliability prediction of a certain type of aircraft avionics system as an example, a fault tree with the failure of the top-level task as the top event, the failure state of the input port function of the unit and the failure state of the unit itself as the bottom event is established, and Altarica is used as the modeling language , to realize fault tree splicing of interfaces, input ports, and output ports, and to establish a formal model consistent with the system design. On this basis, common software such as Saftylab and Rellab can be used to generate automatic fault trees and calculate system task reliability indicators. The specific process is as follows:

[0036] Such as figure 1 As shown, the task reliability modeling and prediction method of aircraft complex system based on fault tree includes the following steps:

[0037] S1: According to the specific tasks of the system in the execution task profile, sort out the top-level functions of th...

Embodiment 2

[0058] Taking the avionics system as an example, use the method in Embodiment 1 to construct a fault tree with the failure mode of the top-level function of the system as the bottom event, the failure of the task stage as the top event, and then use the failure state of the output port function of the unit as the bottom event, The failure mode of the top-level function of the system is the fault tree of the top event, and finally the failure state of the input port function of the unit and the failure state of the unit itself are the bottom events, and the failure state of the output port function of the unit is the fault tree of the top event. By splicing the three-layer fault tree, a formal model consistent with the system design is established, and the minimum cut set and Mission reliability index, avionics system mission reliability analysis results and expected results are as follows: Figure 8a , Figure 8b , Figure 9 shown.

[0059] In summary, the present invention...

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Abstract

The embodiment of the invention provides an aircraft complex system task reliability modeling prediction method based on a fault tree, comprising the following steps: according to a specific task of a system in a task execution profile, carding the top layer function of the system and the influence of each function on a task stage, determining a system task failure criterion, and establishing a fault model through system function modeling and fault logic modeling. Establishing a fault tree which takes top-layer task failure as a top event and takes an input port function failure state of a unit and a failure state of the unit as a bottom event, taking Alarica as a modeling language, realizing fault tree splicing of failure of an interface, an input port and an output port, establishing a formalized model consistent with system design, and establishing a fault tree model of the system design according to the formalized model. Based on common software such as Saftylab, Relalab and the like, automatic fault tree generation is realized, and a system task reliability index is calculated.

Description

technical field [0001] This application belongs to the technical field of aviation system mission reliability prediction, and more specifically, relates to a method for modeling and predicting mission reliability of aircraft complex systems based on fault trees, which can be applied to aircraft flight control systems, fuel systems, power supply systems, hydraulic pressure System, avionics system and other complex system task reliability prediction. Background technique [0002] Mission reliability prediction is to estimate the probability that a product will complete its specified function during the execution of the mission. At present, the common form of aircraft system-level mission reliability prediction is to draw a mission reliability block diagram, and calculate through mathematical models such as series, parallel, voting and bypass. With the increase of the complexity of the aircraft system, the key system has functional reconfiguration design, redundancy design, th...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06Q10/06G06F119/02
Inventor 刘世华黄轶华邹蕊雷长春杨璨王志强阿西达涂美霞刘欣巴洪
Owner JIANGXI HONGDU AVIATION IND GRP
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