Finite element updating Chat sites shadow west

Posted by / 07-Dec-2020 12:57

Inconsistency in the frequency results due to erroneous inputs of geometrical and material parameters to the finite element analysis can be salvaged by applying the finite element model updating procedure.

Two updating cases show that the optimization sequences converge quickly and significant improvements in frequency prediction are achieved.

摘要: In this paper, two experimental techniques, Electronic Speckle Pattern Interferometry and Stroboscopic Interferometry, and two different finite element analysis packages are used to measure or to analyze the frequencies and mode shapes of a micromachined, cross-shaped torsion structure.

Four sets of modal data are compared and shown having a significant discrepancy in their frequency values, although their mode shapes are quite consistent.

The updated numerical model can be used to perform a more accurate structural assessment.

Herein, its effectiveness is validated through the fatigue assessment of a lively footbridge considering two different numerical models: (i) a preliminary finite element (FE) model and (ii) an updated version of the preliminary model based on the modal parameters of the footbridge identified experimentally.

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The safe life method was used to assess such damage.This corresponding relation is important for the modification of the local stiffness based on the macro-strain.The local and global parameters can be simultaneously updated.A finite model updating method that combines dynamic-static long-gauge strain responses is proposed for highway bridge static loading tests.For this method, the objective function consisting of static long-gauge stains and the first order modal macro-strain parameter (frequency) is established, wherein the local bending stiffness, density and boundary conditions of the structures are selected as the design variables.

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Experimental and operational modal analysis and simulation make benefit from common databases.

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