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Method for polymorphic and dynamic reliability assessment for shield cutterhead and drive system

A drive system and shield cutter head technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problem that the selection of construction parameters cannot be considered, the failure characteristics of the shield cutter head construction system cannot be accurately reflected, and the analysis cannot be performed. Multi-state system reliability and other issues, to achieve good economic and social benefits and reduce construction risks

Active Publication Date: 2017-09-08
BEIJING UNIV OF TECH
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  • Application Information

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Problems solved by technology

The Monte Carlo finite element method uses loads, material parameters and other mechanical indicators as random variables for numerical simulation to calculate the failure probability of the shield cutter head, and cannot consider the influence of non-mechanical indicators such as construction parameter selection and operation errors
Although the static Bayesian network method can express the influence of various factors on the reliability of the system, it cannot reflect the dynamic interaction relationship between events and the characteristics of changes over time.
The traditional dynamic fault tree method cannot analyze the reliability of multi-state systems, so this method cannot accurately reflect the failure characteristics of the shield cutterhead and its related construction systems

Method used

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  • Method for polymorphic and dynamic reliability assessment for shield cutterhead and drive system
  • Method for polymorphic and dynamic reliability assessment for shield cutterhead and drive system
  • Method for polymorphic and dynamic reliability assessment for shield cutterhead and drive system

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Embodiment Construction

[0068] The present invention is a multi-state dynamic reliability analysis method of a shield cutter head and a driving system, which is to combine the traditional two-state dynamic gate (SEQ gate) and PAND gates) are extended to polymorphic dynamic gates to establish a system polymorphic dynamic fault tree. Transform the dynamic fault tree based on the dynamic Bayesian network, and use the Bayesian network reasoning to analyze the dynamic reliability of the polymorphic system, so as to solve the problem that the existing technology cannot simultaneously consider the system event polymorphism in the reliability analysis of the shield cutter head and the drive system Issues of gender, dependencies, and dynamics. The present invention will be described in further detail below through examples and in conjunction with the accompanying drawings, but the present invention is not limited thereto.

[0069] The failure of the cutterhead and drive system of the earth pressure balance s...

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Abstract

The invention discloses a method for polymorphic and dynamic reliability assessment for a shield cutterhead and a drive system. The method comprises the following steps of firstly, establishing a dynamic fault trees for failure of an earth pressure balance shield machine cutterhead and a drive system; secondly, determining a failure rule for a polymorphic and dynamic gate and extending an established dynamic fault tree model to polymorphism; and lastly, establishing a dynamic Bayesian network model for system failure for a dynamic Bayesian network transformation rule according to the dynamic fault tree and determining system reliability. According to the method, a problem that the dynamic reliability analysis of the shield cutterhead and the drive system cannot consider polymorphism, dynamics and interdependency simultaneously is solved, the dynamic reasoning can be carried out according to the statistical data for failure of basic events, and the more efficient and accurate decision information is provided for fault maintenance and repair of a shield machine.

Description

technical field [0001] The invention discloses a new multi-state dynamic reliability evaluation method for a shield cutter head and a drive system, and belongs to the technical field of reliability evaluation of urban rail transit equipment. Background technique [0002] In recent years, with the rapid development of my country's urban rail transit construction, more and more shield tunnels are being constructed in complex geological environments. When the shield machine passes through uneven soft and hard, complex and changeable, sandy pebbles and other adverse geological formations, it is very prone to failures such as wear of the cutter and cutterhead, failure of the bearing seal, and damage to the reducer. Since the shield machine works underground, the working environment is harsh and the working space is small. Once a fault occurs, it is very difficult to repair and seriously affect the construction period. If it is not handled properly, it will easily lead to safety a...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 杜修力王宁龚秋明许成顺卢鑫月
Owner BEIJING UNIV OF TECH
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