A method for determining a mixed dimensional model interface constraint equation coefficient

Abstract

The invention provides a method for determining a mixed dimensional model interface constraint equation coefficient. The method comprises the steps of cutting beam parts on the two sides of a cantilever beam connecting face to establish a static force analysis model, the model boundary constraint conditions being the same as those of an original model; deducing required stress distribution according to a multipoint constraint equation and performing relevant static force analysis; exporting a stress result of a finite element model node at the section of the connecting face through finite element software. The method is a fine dynamic response calculation method giving consideration to total dynamic features and local structures, and can establish a unified solving procedure of a multipoint constraint equation and complete the solving of the multipoint constraint equation rapidly, thus facilitating the application of a mixed dimensional model in engineering. The method forms a unified solving step for a stress coordination multipoint constraint equation, facilitates unified programming, and thus facilitates promotion in engineering application; the first 10-order modal frequency error of the finite element model established by using the method and a real model is within 1%, and an obtained frequency response curve and the frequency response curve of the real model show consistent changes.

Description

Technical field [0001] The invention belongs to the field of structural dynamics modeling, and specifically is a method for determining interface constraint equation coefficients of a mixed-dimensional model. Background technique [0002] For large structures, directly establishing a fine dynamic finite element model of the overall structure for simulation calculations often encounter situations where the model calculation scale is too large, which seriously affects the efficiency of the finite element analysis, and even makes the analysis impossible. Targeted modeling with different dimensional units is an effective method, but the connection interface of different dimensional units often requires special treatment. Among the various methods currently developed, the transition element method is the first to develop, but its derivation process is not uniform, and it is easy to lock during use, and will produce redundant non-physical modes; while the use of rigid beam elements has...

AI Technical Summary

Problems solved by technology

However, for irregular structures, or structures with arbitrary cross-sections, it is difficult to obtain the analytical solution of the stress distribution of the structure under different force forms, so it is difficult to determine the required multi-point constraint equation coefficients

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