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A method of processing plane nodes

A technology of plane nodes and processing methods, applied in the direction of design optimization/simulation, etc., can solve problems such as unstable models, and achieve the effect of easy implementation and high computational efficiency

Active Publication Date: 2020-01-24
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This can stabilize unstable nodes and mechanisms, but this method may lead to unstable models if applied in nonlinear analysis

Method used

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  • A method of processing plane nodes
  • A method of processing plane nodes
  • A method of processing plane nodes

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Embodiment 1

[0052] The invention of this example provides a method for processing plane nodes of the finite element model of the rod element of the space truss structure. In order to solve the problem of the singularity matrix of the plane nodes in the finite element model of the space truss structure, the direction of the degree of freedom of the plane node with a stiffness of zero and The planar node is bound together with the same DOF direction of the nearest stable node.

[0053] In the finite element analysis of the bar system, the total node stiffness matrix equation that needs to be solved is:

[0054] [K]{Δ}={P}

[0055] Among them, [k]——total node stiffness matrix, {Δ}——total node displacement vector, {P}——comprehensive node load vector;

[0056] In order to solve the total node stiffness matrix equation, the elements of the total node displacement vector can be rearranged according to the boundary constraints, and the rows and columns of the total node stiffness matrix [K] corr...

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Abstract

The invention relates to a plane node processing method. The method comprises the steps of searching plane nodes of a space truss structure rod unit finite element model; determining instable directions of the plane nodes; determining a master node to which the plane nodes are attached; and binding the instable directions of the plane nodes with the direction degree of freedom of the master node. The technical scheme of the method is applied to a structure with many plane nodes, there is no obvious displacement sudden change, and the problem of plane nodes of a space truss structure can be processed well.

Description

Technical field: [0001] The invention relates to the field of finite element calculation and analysis, and more specifically relates to a plane node processing method. Background technique: [0002] In the process of finite element calculation and analysis of space truss structure rod element model, the problem of plane joints must be dealt with. All the members intersecting at a certain node in the space truss are in the same plane, and there is no member perpendicular to the plane at the node, so the node is called a plane node. This idealized space truss system is a geometrically variable system, and the structural stiffness matrix will become a singular matrix, and such a space truss system cannot be solved, so it is necessary to analyze and deal with this situation. [0003] There are generally four methods for dealing with zero-stiffness plane joints, the virtual bar method, the method of removing degrees of freedom, the method of adding virtual springs, and the metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23
Inventor 王飞李清华苏志钢刘海锋刘亚多汪长智胡晓光朱彬荣杜宝帅
Owner CHINA ELECTRIC POWER RES INST