Frequency domain finite element model correction method based on reduced basis

Abstract

The embodiment of the invention discloses a frequency domain finite element model correction method based on a reduced basis, and relates to the field of dynamic finite element model correction, and the method comprises the steps: carrying out vibration test of a bogie structure, obtaining a measurement frequency response function, and converting the measurement frequency response function to a reduced coordinate through a basis matrix; establishing an initial finite element model of the structure, and calculating a frequency response function analysis value under reduced coordinates; and calculating a residual error of an analysis value and a measurement value of the frequency response function under the reduced coordinates and a sensitivity matrix of the frequency response function relative to a to-be-corrected parameter, solving a corresponding sensitivity equation to obtain an updated parameter and a finite element model, and taking the updated parameter and the finite element model as an initial finite element model for repeated iteration until the residual error is minimum. The invention is suitable for the correction problem of the bogie finite element model with a large number of degrees of freedom, the calculation efficiency can be remarkably improved on the premise that the precision is guaranteed, and therefore the dynamic finite element model of the bogie structure is efficiently corrected through actual test data.

Description

technical field [0001] The invention belongs to the field of finite element model correction, in particular to a frequency domain method for correcting a dynamic finite element model with a large number of degrees of freedom formed by a bogie structure. Background technique [0002] With the continuous increase of the speed of modern trains, the requirements for the reliability and precision of the bogie structure are getting higher and higher. Its form and parameters are analyzed from multiple angles, so it is very important to establish a finite element model that can reflect the actual dynamic characteristics of the bogie. However, due to the complexity of each part of the bogie, the modeling process inevitably needs to simplify the structure and use a variety of mechanical elements with parameters to discretize. The initial model parameters selected by experience may make the dynamic characteristics of the bogie finite element model It is inconsistent with the actual st...

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Problems solved by technology

[0003] In order to overcome the low efficiency of the existing model correction technology when applied to the bogie structure, the present invention proposes a frequency-domain correction method for the finite element model based on the reduced basis, and the calculation efficiency is significantly improved under the premise of ensuring accuracy. Improvement, using this invention, the large-scale finite element model formed by the bogie can be quickly and accurately corrected to make its dynamic characteristics consistent with the actual test results

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