Interval model time varying reliability based on active service structure optimized maintenance design method taking into account dynamic uncertainty

Abstract

The invention discloses an interval model time varying reliability based on active service structure optimized maintenance design method taking into account dynamic uncertainty. According to the invention, influence on mechanical behaviors of an on active service structure by time varying uncertainty is taken into account comprehensively. First, through defining the uncertainty characteristics ofquantified basic variables of a non-probability interval model and through uncertainty propagation analysis, a limit state function of the structure taking into account a static-dynamic hybrid uncertainty condition is deduced; reliability indexes of the on active service structure based on the non-probability interval model are established based on a first-time passage theory; establishment of a maintenance cost model under a non-probability frame is tried by taking a maintenance cost formula proposed by Frangopol as the basis and an optimized maintenance design method for the on active service structure is constructed; the optimal scheme for maintenance in the service cycle of the on active structure is finally determined through repeated iteration of particle swarm optimization by takingthe structure maintenance total cost as the optimization target, taking the maintenance frequency, the type and the corresponding time points as design variables and taking the structure reliabilityas optimization constraints.

Description

technical field [0001] The invention relates to the technical field of safety assessment and maintenance of in-service structures, in particular to structural reliability analysis and optimization design considering static and dynamic interval uncertainties. The optimal maintenance design method for constraints minimizes maintenance costs on the basis of ensuring structural safety, and provides a theoretical basis for engineering applications. Background technique [0002] The in-service structure refers to the structure that is currently in service. The actual engineering requires that the in-service structure can operate effectively, and at the same time, the probability of structural failure should be controlled at a sufficiently low level. Large and complex in-service structures such as aircraft play an important role in human life, industrial development, and national defense construction, but internal / external, human / natural factors can lead to irreversible material pe...

AI Technical Summary

Problems solved by technology

[0004] At present, most of the maintenance design methods are based on the probability framework, and the uncertainty is quantified by fitting the probability density function of the parameters to be determined by a sufficient number of samples. This method requires a sufficient number of samples, but in engineering , the acquisition of samples is usually very expensive and time-consuming; in addition, most of the existing maintenance strategies regard the maintenance cost as a fixed value, and most of them pre-set a specific maintenance mode, such as periodic maintenance mode, through Optimized maintenance cycle to minimize costs

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