Fast measurement method of antenna model displacement based on substructure degree of freedom condensation
A measurement method and sub-structure technology, applied in the direction of design optimization/simulation, can solve the problems of large computing memory, high hardware requirements, long computing time, etc., to improve performance, reduce processing and measurement time, and reduce simulation analysis and calculation. effect of scale
Active Publication Date: 2022-03-11
ZHEJIANG UNIV
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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
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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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The invention discloses a method for quickly measuring the displacement of an antenna model based on the cohesion of substructure degrees of freedom. First, the overall structure of the antenna model is split into multiple independent substructures of appropriate size, and the degrees of freedom of each substructure are condensed to the control vertices of the boundary elements, and the stiffness matrix of each condensed substructure is assembled into a new model by using the Nitsche method. The overall stiffness matrix of the overall stiffness matrix, the load balance equations of all substructures considering the coupling item are constructed to form the load balance equation of the antenna, and then the displacement vectors of the external nodes of each substructure are obtained, and finally the displacement vectors of the external nodes of each substructure are obtained for each The displacement vectors of the internal nodes of the substructure, thereby obtaining the displacement field of the entire structure of the antenna. The invention splits the overall structure into a plurality of independent substructures and condenses the degrees of freedom to the control vertices, and splices the condensed substructures into a new whole through a weak coupling method, thereby reducing the calculation scale and improving the measurement efficiency.
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...
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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