Complex structure finite element parameter interval correction method based on adaptive meta-model

Abstract

The invention discloses a method for correcting a finite element parameter interval of a complex structure based on an adaptive meta-model. In engineering design, a finite element technology is mainly adopted for numerical simulation, and finite element model correction is an important technology for guaranteeing the accuracy of a calculation result; due to uncertainty, actually measured response shows dispersity, and uncertainty characteristics of response numerical results cannot be predicted through correction of a deterministic finite element model; according to the method, interval uncertainty is considered, an agent meta-model of a finite element model with satisfactory precision is established, and based on the meta-model, an adaptive expansion coefficient is constructed to carry out first-stage rough repair on a to-be-corrected parameter interval; and further based on the rough repair model, an optimization model for model parameter interval correction is established, and secondary fine repair is performed on the interval upper bound and the interval lower bound of the to-be-corrected parameters by adopting an intelligent genetic algorithm. According to the method, the parameter interval influenced by uncertainty in the finite element model can be corrected and quantified, and a new thought is provided for finite element model correction under the uncertainty condition in actual engineering.

Description

technical field [0001] The invention relates to the technical field of complex structure finite element model correction and uncertainty system numerical calculation, in particular to a method for correcting a complex structure finite element parameter interval based on an adaptive element model. Background technique [0002] In practical engineering, especially in important engineering fields such as aerospace, civil engineering, and ships, the analysis and design of complex structural systems are often involved. For large and complex structural systems, it is difficult to achieve the above requirements for scheme modification and reanalysis through theoretical analysis or physical experiments. Finite element numerical calculation technology establishes a unified mathematical model for structural response calculation by means of element discreteness, and assigns physical properties such as material and size to finite element mesh elements; after years of development, finite...

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is: considering the uncertainty of the non-probability interval, in order to make the upper and lower bounds of the interval of the numerical result of the structural response of the finite element model consistent with the measured data, provide a complex structure finite element parameter based on the adaptive element model Interval correction method; the uncertain finite element model problem is modeled as a mathematical optimization problem, the rapid preliminary correction of the finite element model parameter interval is completed through the adaptive element model technology, and the finite element model parameter interval is further completed by using the intelligent optimization algorithm The refinement correction, the present invention can efficiently obtain the finite element model parameter interval with higher precision, so that the uncertainty characteristics of the numerical results of the structural response based on the uncertain finite element analysis of the revised parameter interval are consistent with the measured data

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