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

A constraint equation, mixed dimension technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as difficulty in obtaining analytical solutions of stress distribution, and difficulty in determining coefficients of multi-point constraint equations.

Active Publication Date: 2016-10-12
NORTHWESTERN POLYTECHNICAL UNIV
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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 di

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

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Embodiment Construction

[0061] The invention provides a method for calculating the fine dynamic response of the local structure while taking into account the overall dynamic characteristics. It can establish a unified solution process for the multi-point constraint equation, quickly complete the multi-point constraint equation solution, and facilitate the application of the mixed-dimensional model in engineering. When considering that the local structure cannot be separated, a hybrid dimensional dynamic model that integrates a low-dimensional simplified mesh model that characterizes the surrounding structure and a high-dimensional fine mesh model that characterizes the local structure is established.

[0062] This embodiment is a process of implementing a general numerical construction of a single-ended fixed-end tube beam 3 by using a mixed-dimensional model interface constraint equation, and the tube beam has a circular cross-section. The middle of the pipe beam is the junction surface A 2 , image 3 T...

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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...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23G06F30/367
Inventor 李斌蔡文牛文超
Owner NORTHWESTERN POLYTECHNICAL UNIV
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