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Reliability evaluation method considering common cause failure PMS

A reliability and stage technology, applied in the field of reliability evaluation of PMS considering common cause failure, can solve the problem of evaluating the reliability of PMS and the actual situation.

Active Publication Date: 2021-06-15
XIAN UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a reliability evaluation method of PMS considering common cause failure, which solves the problem that the evaluation of PMS reliability does not conform to the reality due to failure of common cause The problem

Method used

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  • Reliability evaluation method considering common cause failure PMS
  • Reliability evaluation method considering common cause failure PMS
  • Reliability evaluation method considering common cause failure PMS

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Embodiment

[0076] Such as image 3 As shown, the present invention is based on the common cause failure multi-stage task system reliability evaluation algorithm of the discrete time Bayesian network method and includes the following steps:

[0077] Step 1, analyze the multi-stage task system, and establish the discrete-time Bayesian network model of each stage according to the number of stages of the system, the failure function of each component in different stages, and the reliability standard of each stage, such as Figure 5 (a);

[0078] The parameters of the system are set as follows: the components all obey the exponential distribution failure, and the failure rate is λ A1 =0.00025,λ B1 =0.0003,λ A2 =0.0003,λ B2 =0.00015; the working time T of the whole task=280 (hours), the working time T of stage 1 1 = 104 (hours), the working time T of stage 2 2 = 176 (hours);

[0079] Step 2, in order to better balance the calculation accuracy and time complexity, set the number of discr...

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Abstract

The invention discloses a reliability assessment method considering common cause failure PMS, which assesses the reliability of a multi-stage task based on a discrete time Bayesian network method, analyzes common causes by adopting a random common cause model on this basis, and calculates the reliability of a common cause failure multi-stage task system by applying an implicit method. The PMS in the method is a typical complex system and is mostly applied to large-scale equipment such as aerospace equipment, unpredictable loss can be brought to a real system even if a small error exists, the method provided by the invention evaluates the reliability of a common cause failure system of elements, so that a calculation result is closer to an actual working environment of the system, and the problem that the system reliability obtained when common cause failure is not considered is not consistent with the actual system reliability is solved.

Description

technical field [0001] The invention belongs to the technical field of system reliability, and relates to a reliability evaluation method of a PMS considering common cause failure. Background technique [0002] A multi-stage mission system (phase-mission systems, PMS) is a typical complex mission system, which consists of several stages that are continuous in time and do not overlap with each other. Failure of any stage will lead to system failure. PMS widely exists in In large and complex equipment such as aerospace and anti-missile systems. In PMS, the working mode, environmental conditions, system configuration and failure conditions of the same component will change with the stage. For example, the motion process of an aircraft is divided into six stages: taxiing, take-off, ascent, cruising, approach, and landing. To repair the two-state PMS, the end state of each element in the previous stage is the start state of the next stage. The key to the reliability analysis o...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F119/02
CPCG06F30/20G06F2119/02Y02P90/30
Inventor 宋霄罡张媛梁莉黑新宏
Owner XIAN UNIV OF TECH
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