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Antenna model displacement rapid measurement method based on substructure degree-of-freedom condensation

A measurement method and sub-structure technology, applied in the direction of design optimization/simulation, etc., can solve the problems of large calculation memory, high hardware requirements, and high resource consumption

Active Publication Date: 2020-06-05
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ordinary isogeometric analysis method assembles the overall stiffness matrix at one time, the calculation takes up a lot of memory, takes a long time, has high requirements for computer hardware for simulation analysis, and consumes more resources

Method used

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  • Antenna model displacement rapid measurement method based on substructure degree-of-freedom condensation
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  • Antenna model displacement rapid measurement method based on substructure degree-of-freedom condensation

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Embodiment Construction

[0044] The present invention will be further described below in conjunction with the analysis of the external load deformation of the antenna.

[0045] Embodiments of the present invention are as follows:

[0046] by figure 2 The antenna shown is an example. The precision error of the antenna structure under the action of external forces such as its own weight and wind load will change the distribution of the electromagnetic amplitude and phase of the antenna aperture. It is analyzed that it is under the combined action of gravity load and wind load with a wind speed of 20m / s at a working angle of 45 degrees. of deformation.

[0047] (1) The overall structure of the antenna model is represented by an unstructured T-spline shell. Due to the symmetry of the model, it is divided into 16 identical substructures, and each substructure consists of multiple unstructured T-spline patches constitute.

[0048] (2) It can be obtained through the connection relationship of each substru...

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Abstract

The invention discloses an antenna model displacement rapid measurement method based on substructure degree-of-freedom condensation. The method comprises the following steps: firstly, splitting the overall structure of an antenna model into a plurality of independent substructures with proper sizes; the degree of freedom of each substructure is condensed to the control vertex of the boundary unit;assembling the condensed sub-structure stiffness matrixes into a new overall stiffness matrix by adopting a Nitsche method; and establishing a load balance equation of the antenna by using the load balance equations of all the substructures considering the coupling items, then solving a displacement vector of an external node of each substructure, and finally solving a displacement vector of an internal node of each substructure by using the displacement vector of the external node of each substructure, thereby obtaining a displacement field of the whole structure of the antenna. According tothe invention, the whole structure is split into a plurality of independent substructures, the independent substructures are condensed to a control vertex in a degree of freedom, and the condensed substructures are spliced into a new whole through a weak coupling method, so that the calculation scale is reduced, and the measurement efficiency is improved.

Description

technical field [0001] The invention relates to a method for measuring the load displacement of a complex product model, in particular to a method for rapidly measuring the displacement of a geometric model such as an antenna based on the condensation of substructure degrees of freedom. Background technique [0002] Antenna products are complex industrial products with complex structure, large size but small thickness, resulting in a huge number of grid cells in its analysis model. The stiffness matrix of the ordinary isogeometric method is denser than that of the traditional finite element method, and the overall stiffness matrix of the isogeometric model of the antenna product is a high-dimensional dense matrix. Ordinary isogeometric analysis method assembles the overall stiffness matrix at one time, which takes up a lot of memory and takes a long time to calculate. It has high requirements for computer hardware for simulation analysis and consumes more resources. Conten...

Claims

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Application Information

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IPC IPC(8): G06F30/23
Inventor 刘振宇袁沛杨明龙裘辿谭建荣
Owner ZHEJIANG UNIV