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Bolt reliability analysis method based on time-varying failure

An analysis method and reliability technology, applied in special data processing applications, instruments, electrical and digital data processing, etc., can solve the problem of rarely considering important factors such as the dynamic change of bolt reliability, to facilitate maintenance and replacement, and ensure normal work. Effect

Pending Publication Date: 2021-04-06
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the theoretical analysis of bolt reliability at home and abroad mostly studies the reliability acquisition method at a certain point in time, and seldom considers the dynamic change of bolt reliability during the entire service cycle and the important factors that cause this change.

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  • Bolt reliability analysis method based on time-varying failure
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  • Bolt reliability analysis method based on time-varying failure

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Embodiment Construction

[0023] A steel hydraulic container cover is connected by a bolt group. It is known that the inner diameter of the container is D = 250mm, and there is a liquid with a certain pressure inside. The maximum pressure allowed for the liquid in the container is P max = 1.82 MPa. Distribute 12 M16(d) evenly along the flange circumference 1 =13.835mm) ordinary bolts. The relative stiffness of the bolt C b / (C b +C m ) = 0.5, according to tightness requirements, the remaining preload F 0 =1.83F, F is the working load of the bolt.

[0024] (1) The basic random variables of bolts and their descriptions are shown in Table 1 after calculation based on known conditions.

[0025] (2) The whole period T of bolt service can be divided into n time periods, and the structural resistance in each period t(t=T / n) is R(t i ), i=(1,2,···n). The probability that the structure will not fail within time T is P(T)=P[R(t i )>S(t i )]=P[R(t 1 )>S(t 1 ),R(t 2 )>S(t 2 ),···,R(t n )>S(t n )]. ...

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Abstract

The invention discloses a bolt reliability analysis method based on time-varying failure, and aims to grasp the service condition of a bolt in real time, and how to acquire the dynamic track of the reliability becomes crucial. In order to improve the safety and reliability of the bolt, the time-varying reliability theory is used for analyzing the resistance and load related parameters of the bolt in the service process. On the basis of the time-varying reliability theory, a resistance attenuation model of the bolt is researched, and finally a time-varying reliability mathematical model of the bolt is established. Analysis is carried out through engineering examples, and the influence of attenuation of the bolt resistance along with time on the bolt reliability index and the failure probability is indicated. Compared with analysis results of the reliability index and the failure probability of the bolt under different resistance attenuation coefficients, the reliability index can be reduced along with the increase of the resistance attenuation coefficients, and the failure probability can be increased along with the increase of the resistance attenuation coefficients.

Description

technical field [0001] The invention belongs to the field of structural reliability analysis and relates to a bolt reliability analysis method based on time-varying failure. Background technique [0002] Bolt fastening connection is a commonly used connection method, and its purpose is to obtain sufficient clamping force to ensure the reliability of the connection. Bolts are the main components of metal structure connections in mechanical systems. They are widely used in various mechanical structures. any load. Therefore, pre-estimating the reliability of bolts during service and analyzing their reliability are very important to the safety and reliability of the mechanical structure and the entire mechanical system. [0003] Xiao Chengyong, Shi Boqiang, etc. established a bolt reliability calculation model based on the concept and algorithm of blind numbers in the unknown theory. Wei Congmei combined mechanical fuzzy optimization and reliability design to form mechanical ...

Claims

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Application Information

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IPC IPC(8): G06F30/17G06F30/20G06F119/02G06F119/14
CPCG06F30/17G06F30/20G06F2119/02G06F2119/14
Inventor 赵永胜王丽霞李富平武宏超
Owner BEIJING UNIV OF TECH