CN113094960B - Method for quickly generating electromagnetic model of multi-core aviation connector based on moment method - Google Patents
Method for quickly generating electromagnetic model of multi-core aviation connector based on moment method Download PDFInfo
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Abstract
The invention discloses a method for quickly generating an electromagnetic model of a multi-core aviation connector based on a moment method, which comprises the following steps of: establishing a two-dimensional model of the aviation connector connection position layer, and subdividing and discretizing the two-dimensional model according to a plane triangular unit mode; marking the grid materials of each two-dimensional area to obtain a material number; grouping the obtained material numbers according to the outer conductor, the inner core, the inner conductor and the others to obtain a grouping table; wherein the inner core set requires a dielectric material to be filled; and forming plane triangular meshes for all the generated outer conductor groups, inner core groups and inner conductor groups, wherein each mesh grows along the normal direction of the meshes, namely extends for L meters. The invention grows the body grid through subdivision of a plane two-dimensional geometrical structure, and improves the generation of electromagnetic structure models of the body grid and the surface grid suitable for solving a multi-core transmission line structure by a moment method and a multilayer rapid multipole method through classification, copying and moving of the grid.
Description
Technical Field
The invention relates to the field of computational electromagnetism, in particular to a method for quickly generating an electromagnetic model of a multi-core aviation connector based on a moment method.
Background
The aviation plug is one of connectors, originates from the military industry, and is named as aviation plug for short. An aviation plug is an electromechanical element that connects electrical lines, and therefore its own electrical parameters are the first issues to consider in selecting an aviation plug. Proper selection and use of the aviation plug is an important aspect of ensuring circuit reliability. It is therefore important to model aeronautical connectors correctly and quickly when designing them.
However, the prior art has the following problems: (1) establishing a whole three-dimensional model and subdividing a volume mesh; (2) the subdivision caused by the conventional three-dimensional modeling easily causes the number of grids to be very large; (3) the mesh generated by conventional three-dimensional modeling results in low computational efficiency.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for quickly generating an electromagnetic model of a multi-core aviation connector based on a moment method.
The purpose of the invention is realized by the following technical scheme:
the invention provides a method for quickly generating an electromagnetic model of a multi-core aviation connector based on a moment method, which comprises the following steps of:
establishing a two-dimensional model of the aviation connector connection position layer, and subdividing and discretizing the two-dimensional model according to a plane triangular unit mode;
marking the grid materials of each two-dimensional area to obtain a material number;
grouping the obtained material numbers according to the outer conductor, the inner core, the inner conductor and the others to obtain a grouping table; wherein the inner core set requires a dielectric material to be filled;
forming plane triangular meshes for all the generated outer conductor groups, inner core groups and inner conductor groups, wherein each mesh grows along the normal direction of the meshes, namely extends for L meters;
converting the generated body grid and the generated surface grid into a body grid and a surface grid supported by a moment method solver;
respectively extracting outer wrapping surface grids of the body grids obtained by extending the inner conductor group and the outer conductor group to obtain an inner conductor wrapping surface grid and an outer conductor wrapping surface grid;
moving the grids corresponding to the material numbers of the inner core groups to the corresponding L meters along the normal direction according to the grouping table, and plugging the seal of the aviation connector by using the grids of the instant seal surface;
and storing the generated body grids into a body grid file, storing the generated inner conductor wrapping surface grids and outer conductor wrapping surface grids and the generated sealing surface grids into a surface grid file, and generating an electromagnetic model of the multi-core aviation connector.
Furthermore, the growth mode of the grid is a triangular prism grid.
Further, the converting the generated body grid and the surface grid into the body grid and the surface grid supported by the moment method solver includes: the triangular prism mesh is converted into a tetrahedral mesh.
Further, each grid is grown along the positive normal direction of the grid, namely is extended by L meters, and the method comprises the following steps: and co-extending for n times, wherein the extending distance is L/n meters each time.
Further, the method further comprises:
and setting an excitation source generation port for the electromagnetic model of the multi-core aviation connector.
Further, the method further comprises:
the mesh at the respective layer heights was set as the PEC boundary and the material of the grown volume mesh was set as the dielectric plate material.
Further, the method further comprises:
using a calculation matrix [ A ]]nbase×nbaseFilling to obtain a system matrix [ A ] required by moment method calculation]n×nAnd wherein nbase is the total number of unknowns of all basis functions in the model.
Further, the method further comprises:
using excitation terms [ rhs ]]nbaseFilling to obtain a right vector required by moment method calculation.
Further, the method further comprises:
and (4) solving Ax (rhs) by utilizing matrix calculation to obtain x, wherein the x is the current amount x [ ibase ] on the unknown quantity of each base function ibase, and ibase is an integer subscript from 1 to nbase.
Further, the method further comprises:
the near-far field distribution is obtained by means of said x-calculation.
The invention has the beneficial effects that:
in an exemplary embodiment of the invention, through subdivision of a planar two-dimensional geometric structure, a volume grid is grown, and through classification, copying and moving of the grid, the generation efficiency of an electromagnetic structure model of the volume grid and the surface grid suitable for solving a multi-core transmission line structure by a moment method and a multi-layer fast multipole method is improved.
Drawings
FIG. 1 is a flowchart of a method disclosed in an exemplary embodiment of the invention;
FIG. 2 is a schematic diagram of a four-core aircraft connector and shielded wire configuration as disclosed in an exemplary embodiment of the invention;
FIG. 3 is a schematic diagram of a two-dimensional model and a subdivision discretization of a connection location layer of an aerospace connector as disclosed in an exemplary embodiment of the invention;
FIG. 4 is a schematic illustration of grid material numbering for a two-dimensional area as disclosed in an exemplary embodiment of the invention;
FIG. 5 is a schematic illustration of the disclosed extension effect of an exemplary embodiment of the present invention;
FIG. 6 is a schematic diagram of a grid grown in a triangular prism shape according to an exemplary embodiment of the present invention;
FIG. 7 is a schematic illustration of the effect of the multiple expansion method disclosed in an exemplary embodiment of the present invention;
FIG. 8 is a schematic diagram of a transformation of a triangular prism mesh into a tetrahedral mesh as disclosed in an exemplary embodiment of the present invention;
FIG. 9 is a schematic illustration of an electromagnetic model of a multi-core aerospace connector generated as disclosed in an exemplary embodiment of the invention;
figure 10 is a far field pattern of a horn of an aircraft connector connection as disclosed in an exemplary embodiment of the invention.
Fig. 11 is a schematic diagram of a detailed split discrete implementation manner disclosed in an exemplary embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
Referring to fig. 1, fig. 1 shows a method for rapidly generating an electromagnetic model of a multicore aviation connector based on a moment method according to an exemplary embodiment of the present invention, and in the present exemplary embodiment, a model generation scheme of the method is described by taking a four-core aviation connector and a shielding wire shown in fig. 2 as an example.
The method comprises the following steps:
s01: as shown in fig. 3, a two-dimensional model of the aviation connector connection position layer is established, and then the two-dimensional model is divided and discretized according to a plane triangular unit mode;
the subdivision dispersion function is to convert a two-dimensional geometric structure into a two-dimensional grid structure which can be used for electromagnetic numerical calculation, and the two-dimensional geometric structure cannot be directly used for electromagnetic numerical calculation; namely, the subdivision discretization is to convert the two-dimensional geometry structure into a mesh structure in the form of a list of triangular cells, as shown in fig. 11 (the left side is the two-dimensional geometry structure, and the right side is the two-dimensional mesh structure). The mesh structure in the form of the triangular unit list obtained by subdivision and dispersion is input for growth, and the growth is obtained based on the triangular unit list.
S02: as shown in fig. 4, marking the mesh material of each two-dimensional area to obtain a material number;
s03: grouping the obtained material numbers according to the outer conductor, the inner core, the inner conductor and the others to obtain a grouping table; wherein the inner core set needs to be filled with a dielectric material.
In this exemplary embodiment, the grouping table is as follows:
| grouping | Material number |
| Outer conductor set | 6 |
| |
5 |
| Inner conductor set | 1、2、3、4 |
| |
7 |
S04: all the generated outer conductor groups, inner core groups and inner conductor groups form plane triangular meshes, each mesh grows along the normal direction of the mesh, namely extends for L meters, and the extending effect is shown in fig. 5.
Preferably, in one exemplary embodiment, the grid is grown as a triangular prism grid, as shown in fig. 6.
More preferably, in one exemplary embodiment, the growing of each grid along the positive normal direction of the grid, i.e. extending for L meters, includes: and co-extending for n times, wherein each extending distance is L/n meters, and the multiple extending mode of the exemplary embodiment is shown in FIG. 7.
Wherein the effect of the multiple extensions is to ensure that each extension distance d < ═ wavelength/10 or wavelength/20 or even wavelength/40; the accuracy of numerical calculation is satisfied, but the extension distance is not smaller, the better, and the limit of the calculation efficiency is also applied (the smaller the extension distance is, the more the extension times are, the more the generated grids are, the longer the calculation memory and the calculation time are, and in addition, if the distance is small to a certain degree, the divergence of numerical errors is caused).
S05: and converting the generated body grid and the generated face grid into the body grid and the face grid supported by the moment method solver.
Preferably, in an exemplary embodiment, the converting the generated body grid and the surface grid into the body grid and the surface grid supported by the moment method solver includes: the triangular prism mesh is converted into a tetrahedral mesh. A schematic diagram of the method used to convert a triangular prism mesh into a tetrahedral mesh is shown in fig. 8. That is, one triangular prism lattice (1,2,3,4, 5, 6) can be converted into three tetrahedral lattices (4, 3, 2, 1), (3, 5, 4, 2) and (6, 5, 4, 3).
S06: and respectively extracting the outer wrapping surface grids of the body grids obtained by extending the inner conductor group and the outer conductor group to obtain an inner conductor wrapping surface grid and an outer conductor wrapping surface grid.
S07: and moving the grids corresponding to the material numbers of the inner core groups to the corresponding L meters along the normal direction according to the grouping table, and plugging the seal of the aviation connector by using the grids of the instant seal surface.
S08: the generated body mesh is saved to a body mesh file, the generated inner conductor-wrapped surface mesh and outer conductor-wrapped surface mesh, and the generated sealing surface mesh are saved to a surface mesh file, and an electromagnetic model of the multi-core aviation connector is generated, as shown in fig. 9.
Through subdivision of the planar two-dimensional geometric structure, the body grid is grown, and through classification, copying and moving of the grid, the electromagnetic structure model generation efficiency of the body grid and the surface grid suitable for solving the multi-core transmission line structure through a moment method and a multi-layer rapid multi-pole sub method is improved.
Preferably, in one exemplary embodiment, the method further comprises:
s09: and setting an excitation source generation port for the electromagnetic model of the multi-core aviation connector.
Preferably, in one exemplary embodiment, the method further comprises:
s10: the mesh at each level was set as a PEC boundary and the material of the grown volume mesh was set as a dielectric slab material (including relative permittivity and relative permeability).
Preferably, in an exemplary embodiment, the method further includes model calculation and post-processing, and specifically includes the following steps:
s111: using a calculation matrix [ A ]]nbase×nbaseFilling to obtain a system matrix [ A ] required by moment method calculation]n×nWherein nbase is the total number of unknowns of all basis functions in the model, amnThe mth row and nth column element of A; the fill formula is as follows:
wherein f ismAnd fnIs the mth and nth basis functions, G is a three-dimensional Green's function;
r is a field point vector; r' is a source point vector; epsilonlRepresents a dielectric constant; mu.slThe magnetic permeability is shown.
S112: using excitation terms [ rhs ]]nbaseFilling to obtain a right vector required by moment method calculation:
in the formula (I), the compound is shown in the specification,
is the field distribution in the mth basis function domain.
S113: and (4) solving Ax (rhs) by utilizing matrix calculation to obtain x, wherein the x is the current amount x [ ibase ] on the unknown quantity of each base function ibase, and ibase is an integer subscript from 1 to nbase.
S114: the near-far field distribution is obtained by means of said x-calculation.
A far field pattern of a horn of the aircraft connector connection can be obtained by exciting the seal through a wave port and calculating through a series of post-processing, as shown in fig. 10.
Based on any of the above method exemplary embodiments, a further exemplary embodiment of the present invention provides a storage medium having stored thereon computer instructions, which when executed perform the steps of the method for fast generation of an electromagnetic model of a multicore aviation connector based on a moment method.
Based on any of the above method exemplary embodiments, a further exemplary embodiment of the present invention provides an apparatus, which includes a memory and a processor, where the memory stores computer instructions executable on the processor, and the processor executes the computer instructions to perform the steps of the method for fast generation of the electromagnetic model of the multicore aeronautical connector based on the moment method.
Based on such understanding, the technical solutions of the present embodiments may be essentially implemented or make a contribution to the prior art, or may be implemented in the form of a software product stored in a storage medium and including several instructions for causing an apparatus to execute all or part of the steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
It is to be understood that the above-described embodiments are illustrative only and not restrictive of the broad invention, and that various other modifications and changes in light thereof will be suggested to persons skilled in the art based upon the above teachings. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (10)
1. A method for quickly generating an electromagnetic model of a multi-core aviation connector based on a moment method is characterized by comprising the following steps: the method comprises the following steps:
establishing a two-dimensional model of the aviation connector connection position layer, and subdividing and discretizing the two-dimensional model according to a plane triangular unit mode;
marking the grid materials of each two-dimensional area to obtain a material number;
grouping the obtained material numbers according to the outer conductor, the inner core, the inner conductor and the others to obtain a grouping table; wherein the inner core set requires a dielectric material to be filled;
forming plane triangular meshes for all the generated outer conductor groups, inner core groups and inner conductor groups, wherein each mesh grows along the normal direction of the meshes, namely extends for L meters;
converting the generated body grid and the generated surface grid into a body grid and a surface grid supported by a moment method solver;
respectively extracting outer wrapping surface grids of the body grids obtained by extending the inner conductor group and the outer conductor group to obtain an inner conductor wrapping surface grid and an outer conductor wrapping surface grid;
moving the grids corresponding to the material numbers of the inner core groups to the corresponding L meters along the normal direction according to the grouping table, namely plugging the seal of the aviation connector by using the grids of the seal surface;
and storing the generated body grids into a body grid file, storing the generated inner conductor wrapping surface grids and outer conductor wrapping surface grids and the generated sealing surface grids into a surface grid file, and generating an electromagnetic model of the multi-core aviation connector.
2. The method for rapidly generating the electromagnetic model of the multicore aviation connector based on the moment method as claimed in claim 1, wherein: the growth mode of the grid is a triangular prism grid.
3. The method for rapidly generating the electromagnetic model of the multicore aviation connector based on the moment method as claimed in claim 2, wherein: the step of converting the generated body grid and the generated face grid into the body grid and the face grid supported by the moment method solver comprises the following steps: the triangular prism mesh is converted into a tetrahedral mesh.
4. The method for rapidly generating the electromagnetic model of the multicore aviation connector based on the moment method as claimed in claim 1,2 or 3, wherein: each grid grows along the positive normal direction of the grid, namely extends for L meters, and comprises the following components: and co-extending for n times, wherein the extending distance is L/n meters each time.
5. The method for rapidly generating the electromagnetic model of the multicore aviation connector based on the moment method as claimed in claim 1, wherein: the method further comprises the following steps:
and setting an excitation source generation port for the electromagnetic model of the multi-core aviation connector.
6. The method for rapidly generating the electromagnetic model of the multicore aviation connector based on the moment method as claimed in claim 5, wherein: the method further comprises the following steps:
the mesh at the respective layer heights was set as the PEC boundary and the material of the grown volume mesh was set as the dielectric plate material.
7. The method for rapidly generating the electromagnetic model of the multicore aviation connector based on the moment method as claimed in claim 6, wherein: the method further comprises the following steps:
using a calculation matrix [ A ]]nbase×nbaseFilling to obtain a system matrix [ A ] required by moment method calculation]n×nAnd wherein nbase is the total number of unknowns of all basis functions in the model.
8. The method for rapidly generating the electromagnetic model of the multicore aviation connector based on the moment method as claimed in claim 7, wherein: the method further comprises the following steps:
using excitation terms [ rhs ]]nbaseFilling to obtain a right vector required by moment method calculation.
9. The method for rapidly generating the electromagnetic model of the multicore aviation connector based on the moment method as claimed in claim 8, wherein: the method further comprises the following steps:
and (3) solving Ax (rhs) by utilizing matrix calculation to obtain x, wherein x is the current amount x [ ibase ] on the unknown quantity of each base function ibase, and ibase is an integer subscript from 1 to nbase.
10. The method for rapidly generating the electromagnetic model of the multicore aviation connector based on the moment method as claimed in claim 9, wherein: the method further comprises the following steps:
the near-far field distribution is obtained by means of said x-calculation.
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