CN102708236B - Elimination and conversion method of miniature structure of geometric model based on electromagnetic numerical calculation - Google Patents
Elimination and conversion method of miniature structure of geometric model based on electromagnetic numerical calculation Download PDFInfo
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Abstract
The invention relates to an elimination and conversion method of a miniature structure of a geometric model based on electromagnetic numerical calculation. The method comprises the following steps: 101: reading information from a model into a memory; 102: setting a variable i=0; 103: reading a first surface patch of the model from the memory; 104: calculating the number n of vertexes of the surface patch; 106: reading and sequencing the four sides of the surface patch in length; 107: judging if a is less than m; 108: setting j=j+1; 109: processing the shortest side; 110: judging if j is less than n; 111: acquiring the information of the secondary shortest side; 112: judging if I is less than num 1; 113: reading the next surface patch of the model from the memory; 114: processing a folded surface and an antenna; 115: reading a first surface patch from the memory; 116: judging the number n of the vertexes of the surface; 117: deleting the surface patch from the model; 118: setting i=i+1; 119: judging if i is less than num 1; and 120: reading the next surface patch of the model from the memory.
Description
Technical field
The invention belongs to computing machine carrier model modeling field, the geometric model small structure based on electromagnetism numerical evaluation is eliminated method for transformation.
Background technology
Vehicle-mounted, airborne, carrier-borne, boat-carrying and spaceborne communication system all can be summed up as carrier communication system.Carrier can be divided into the car body of continental rise, the body of space base, warship (ship) body of sea base, the celestial body of space-based with delivery vehicle difference; carrier is the metallic conductor on electromagnetics, and the antenna of installing on it has short-wave antenna, ultrashort wave antenna, ultra-high frequency antenna, Global Link antenna, satellite antenna, microwave antenna, cluster car antenna, wireless access antenna etc.In earthquake relief work, flood-fighting, accident, emergent and military commanding and operational front have a wide range of applications carrier antenna communication system, have become important civil and military equipment.
Several antennas are at least installed on the carrier of carrier antenna communication system, tens antennas at most, these antenna is distributed in compared with narrow space, between antenna, often there are serious monkey chatter, humorous wave interference, Intermodulation Interference etc., carrier structure and aerial position also have a strong impact on the directional diagram of isolation between antennae and antenna, problem the lighter of these electromagnetic compatibility aspects can affect the performance of system, and severe one can cause the interruption of communication.Adopting Emulation of EMC design and forecast analysis software is the effective way addressing these problems, and can shorten the research and development of products cycle, reduction cost of products, optimizing product design.The core of Emulation of EMC design and forecast analysis software is electromagnetism numerical evaluation and divides for numerical evaluation provides the grid of discrete data.Present stage, main electromagnetism numerical computation method was finite element method, Finite-Difference Time-Domain Method, method of moment etc.Finite element method and Finite-Difference Time-Domain Method are body method for solving, and for carrier antenna structure, due to the skin effect of high-frequency current, induction current is distributed in the top layer of carrier metal, the method of moment of employing based on surface current technology solves, its adaptability is better than finite element method and Finite-Difference Time-Domain Method, and the computational solution precision of method of moment is higher, the electromagnetism that can solve complicated shape target calculates, and can with Fast Multiple Method method, Fast Fourier Transform (FFT), the progressive pre-estimating technology of waveform, time domain approach, Finite Element Methods etc. combine, to solve high frequency, calculate, Electrically large size object calculates, broadband is calculated, nonhomogeneous media calculating etc., thereby it has obtained application more and more widely, become the of paramount importance method in electromagnetics of calculating.
For the whip antenna in carrier antenna structure, because its antenna is thinner, can think that electric current only distributes along axis; Carrier can be approximate by the metal guide dignity of sealing.When solving this class problem, need on wire, set up improved Electric Field Integral Equation, in carrier side, set up magnetic field integral equation, and the region being connected with carrier side at antenna, its limit of integration comprises straight-line segment and conductor surface, also will solve by setting up Electric and magnetic fields mixing integral equation.Solve these integral equations and can obtain line current on antenna and the surface current of carrier side, and then can calculate isolation and the Electric Field Distribution of antenna.The numerical method that solves at present these integral equations is mainly method of moment.The prerequisite that method of moment solves is that the grid of carrier side is divided and the grid of antenna is divided, and the grid of antenna is divided simple, and the grid of carrier side is divided because the complexity of carrier structure often can not obtain desirable result.
For cell configuration is leg-of-mutton Meshing Method, meeting under the prerequisite of numerical evaluation requirement, in division result, long and narrow triangle will lack as far as possible, because long and narrow triangle can make the result of numerical evaluation distort, makes result of calculation and actual falling far short.At present, there is the Meshing Method of many maturations can automatically adjust the quality of grid cell, made division result as far as possible desirable.But in some cases,, as when there are some small structure in carrier, in division result, will unavoidably must there is long and narrow triangle, thereby seriously affect the accuracy of result of calculation.
In order to obtain better grid division result, people often pursue more perfect Meshing Method, and seldom can go to deal with problems from the angle of model simplification.In Electromagnetic Simulation, the foundation of carrier model is in order to utilize computing machine to obtain and the actual simulation result being consistent, with solving practical problems, so both can to shorten working hours, again can be cost-saving.And pursue simply the meticulous of model in order to obtain more realistic result of calculation, and not only can not reach original object, also can make result that larger deviation occurs.Therefore, we can simplify carrier model in suitable scope, thereby solve in grid division, occur long and narrow leg-of-mutton problem.
At present for the division methods of three-dimensional grid model, have a variety of.Paper " based on polygon vertex method vector network Model Simplification Algorithm " (Chinese image graphics journal, the 7th the 6th phase of volume, in June, 2002,601-605, author: Zhou Shilin etc.) in proposed a kind of based on polygon vertex method vector network Model Simplification Algorithm; Paper " the three-dimensional model simplifying algorithm research based on feature " (Journal of System Simulation, the 19th volume o. 11th, in June, 2007,2434-2414, author: Li JianJun etc.) has proposed a kind of half Edge collapse algorithm; Paper " a kind of geometric model simplification method based on Region Segmentation " (Chinese journal of computers, the 29th the 10th phase of volume, in October, 2006,1834-1842, author: Quan Hongyan etc.) proposed first model to be carried out to region division the method that then regional is simplified according to triangle number object ratio; Paper " research of simplifying based on triangular mesh model " (computer engineering and science, the 32nd the 12nd phase of volume,, 69-72, author: Yan Tao etc. in 2010) has designed a kind of shortcut calculation of deleting based on triangle gridding; Paper " the point model shortcut calculation based on similarity " (journal of Zhejiang university (engineering version), the 43rd the 3rd phase of volume, in March, 2009,448-454, author: Wang Renfang etc.) a kind of curvature self-adaptation point model shortcut calculation based on similarity proposed.These methods are all for the short-cut method of three-dimensional grid model but its original intention is all under the prerequisite that keeps master mould shape, to reduce the data volume of model as far as possible, reduce grid number.And need research for the short-cut method of the grid model calculating for electromagnetism.
At present, also there is no the ripe Model Simplification Method for the grid model proposition of calculating for electromagnetism specially.In actual emulation, mostly researchist is rule of thumb, for certain model, reduction procedure is proposed, this requires the user of simulation software should understand very much the Method And Principle of numerical evaluation in software, be familiar with again the modeling method of software, and when the model of emulation is more, it is very large that the workload of model simplification will become.
Summary of the invention
The object of the invention is to overcome in above-mentioned existing model and have the caused problem of small structure, provide a kind of geometric model small structure based on electromagnetism numerical evaluation to eliminate method for transformation, by computing machine, model is simplified to processing.According to the size of operating frequency of antenna, automatically identify and simplify small structure, increase the accuracy of simulation result, thereby reduce workload, save time.
The object of the present invention is achieved like this: the geometric model small structure based on electromagnetism numerical evaluation is eliminated method for transformation, it is characterized in that: comprise the steps:
Step 101: information in model is read in to internal memory, and the dough sheet calculating in model is counted num1 and antenna number num2;
Step 102: establish variable i=0;
Step 103: first dough sheet from internal memory in reading model;
Step 104: calculate the number of vertex n of this dough sheet, and establish variable j=0;
Step 105:i=i+1;
Step 106: the four edges of dough sheet is read and by length sequence, obtained minor face and length of side a thereof;
Step 107: judge that whether a is less than m (m=k λ), if a is less than m, forwards step 108 to; If a is more than or equal to m, forward step 112 to;
Step 108: make j=j+1;
Step 109: to the processing of minor face;
Whether step 110:j is less than n, if so, forwards step 111 to; If not, forward step 112 to;
Step 111: obtain information and the length of side a thereof of time minor face and forward step 107 to;
Whether step 112:i is less than num1, if so, forwards step 113 to, if not, forward step 114 to;
Step 113: the next dough sheet from internal memory in reading model, forwards step 104 to;
Step 114: process folding face and antenna;
Step 115: first dough sheet from internal memory in reading model file also makes i=0;
Step 116: whether the number of vertex n that judges this face is less than 3, if so, forwards step 117 to; If not, forward step 119 to;
Step 117: delete this dough sheet from model;
Step 118: make i=i+1;
Step 119: judge whether i is less than num1, if so, forward step 120 to; If not, algorithm finishes;
Step 120: the next dough sheet from internal memory in reading model, returns to step 116.
The processing of described step 109 to minor face; Comprise the steps:
Step 201: read two terminal A of this minor face and the information of B;
Step 202: the relevant dough sheet that finds model mid point A;
Step 203: the apex coordinate value overlapping with A point in correlation surface is revised as to the coordinate figure that B is ordered, processes minor face and finish.
The described relevant dough sheet that finds model mid point A is to all dough sheets take an A as summit.
Described step 114 is processed folding face and antenna comprises the steps:
Step 301: first dough sheet from internal memory in reading model is also established i=0;
Step 302: whether the number of vertex n that judges this face is 4, if so, forwards step 303 to; If not, forward step 305 to;
Step 303: whether four summits that judge dough sheet are coplanar, if coplanar, forward step 305 to; If not coplanar, forward step 304 to.Four summits supposing dough sheet are respectively A, B, C, D, can form three vectors
with
if
can determine that A, B, C, 4 of D are coplanar, and in actual computation, the number of significant figures retaining due to the data that store in computing machine is limited, the result after calculating has error, and therefore four of the actual use of the present invention coplanar judgment formulas are:
Step 304: use shorter diagonal line that this dough sheet is divided into two triangles;
Step 305: judge whether i is less than num1, if so, forward step 306 to; If not, forward step 307 to;
Step 306: read next dough sheet from internal memory, forward step 302 to;
Step 307: first antenna from internal memory in reading model also established i=0;
Step 308: make i=i+1;
Step 309: whether drop point is on the surface of model to judge this antenna, if so, forwards step 313 to; If not, forward step 310 to;
Step 310: find the face crossing and nearest with its drop point with this antenna place straight line;
Step 311: this antenna place straight line and this face are asked to friendship, and the intersection point of trying to achieve is the new drop point of antenna;
Step 312: the increment of new drop point coordinate compared with original drop point is Δ, the original apex coordinate of antenna adds that Δ is the apex coordinate that this antenna is new;
Step 313: judge that whether i is less than num2, if so, forwards step 314 to; If not, the processing of foldable plane and antenna finishes;
Step 314: read the information of next root antenna from internal memory, forward step 308 to.
The small structure of effects on surface model of the present invention is simplified processing, thereby obtains being convenient to carry out the model of electromagnetism calculating, has the following advantages:
(1) the present invention has carried out simplifying to the small structure in carrier model and has processed, and the result that makes it carry out grid division is more desirable, and the result that electromagnetism is calculated is more accurate;
(2) identification and the simplification processing of the present invention to small structure in carrier model all completed automatically by program, improved efficiency and the accuracy of work.
Accompanying drawing explanation
Fig. 1 is general flow chart of the present invention;
Fig. 2 is the process flow diagram that the present invention processes minor face;
Fig. 3 is the process flow diagram that the present invention processes folding face and antenna;
Fig. 4 is the carrier model example figure that the present invention simulates;
Fig. 5 is the carrier model schematic diagram after the present invention simplifies.
Embodiment
The simplification processing of small structure in primary study carrier model of the present invention.The present invention to the requirement of carrier model is: carrier model is necessary for the solid of surface-closed, and by summit, the triangle to summit or quadrangular plan sheet surround on its surface, and the summit of triangle and quadrangular plan sheet order be counter clockwise direction.
Below in conjunction with accompanying drawing, Model Simplification Method of the present invention is described in further detail:
With reference to Fig. 1, model simplification of the present invention comprises the steps:
Step 101: information in model is read in to internal memory, and the dough sheet calculating in model is counted num1 and antenna number num2;
Step 102: establish variable i=0;
Step 103: first dough sheet from internal memory in reading model;
Step 104: calculate the number of vertex n of this dough sheet, and establish variable j=0;
Step 105:i=i+1;
Step 106: the four edges of dough sheet is read and by length sequence, obtained minor face and length of side a thereof;
Step 107: judge that whether a is less than m (m=k λ), if a is less than m, forwards step 108 to; If a is more than or equal to m, forward step 112 to;
Step 108: make j=j+1;
Step 109: to the processing of minor face, with reference to Fig. 2, the processing of minor face is comprised the steps:
Step 201: read two terminal A of this minor face and the information of B;
Step 202: the relevant dough sheet (i.e. all dough sheets take an A as summit) that finds model mid point A;
Step 203: the apex coordinate value overlapping with A point in correlation surface is revised as to the coordinate figure that B is ordered, processes minor face and finish.
Whether step 110:j is less than n, if so, forwards step 111 to; If not, forward step 112 to;
Step 111: obtain information and the length of side a thereof of time minor face and forward step 107 to;
Whether step 112:i is less than num1, if so, forwards step 113 to, if not, forward step 114 to;
Step 113: the next dough sheet from internal memory in reading model, forwards step 104 to;
Step 114: process folding face and antenna, with reference to Fig. 3, process folding face and antenna and comprise the steps:
Step 301: first dough sheet from internal memory in reading model is also established i=0;
Step 302: whether the number of vertex n that judges this face is 4, if so, forwards step 303 to; If not, forward step 305 to;
Step 303: whether four summits that judge dough sheet are coplanar, if coplanar, forward step 305 to; If not coplanar, forward step 304 to.Four summits supposing dough sheet are respectively A, B, C, D, can form three vectors
with
if
can determine that A, B, C, 4 of D are coplanar, and in actual computation, the number of significant figures retaining due to the data that store in computing machine is limited, the result after calculating has error, and therefore four of the actual use of the present invention coplanar judgment formulas are
Step 304: use shorter diagonal line that this dough sheet is divided into two triangles;
Step 305: judge whether i is less than num1, if so, forward step 306 to; If not, forward step 307 to;
Step 306: read next dough sheet from internal memory, forward step 302 to;
Step 307: first antenna from internal memory in reading model also established i=0;
Step 308: make i=i+1;
Step 309: whether drop point is on the surface of model to judge this antenna, if so, forwards step 313 to; If not, forward step 310 to;
Step 310: find the face crossing and nearest with its drop point with this antenna place straight line;
Step 311: this antenna place straight line and this face are asked to friendship, and the intersection point of trying to achieve is the new drop point of antenna;
Step 312: the increment of new drop point coordinate compared with original drop point is Δ, the original apex coordinate of antenna adds that Δ is the apex coordinate that this antenna is new;
Step 313: judge that whether i is less than num2, if so, forwards step 314 to; If not, the processing of foldable plane and antenna finishes;
Step 314: read the information of next root antenna from internal memory, forward step 308 to.
Step 115: first dough sheet from internal memory in reading model file also makes i=0;
Step 116: whether the number of vertex n that judges this face is less than 3, if so, forwards step 117 to, if not, forward step 119 to;
Step 117: delete this dough sheet from model;
Step 118: make i=i+1;
Step 119: judge whether i is less than num1, if so, forward step 120 to; If not, algorithm finishes;
Step 120: the next dough sheet from internal memory in reading model, returns to step 116.
Through above step, for the simplification of the carrier model that has small structure, just completed.
Simulation example
Utilize the present invention to simplify processing to the carrier model shown in Fig. 4, this model comprises two antennas, and structure a and structure b are two place's small structure.
In antenna transmission frequency, be that 100MHz simplifies processing to this model under the condition of wavelength X=3 meter, now k λ is 0.017379 meter.When reading dough sheet 1 (as shown in structure a in Fig. 4), judge that minor face is limit AB, length is 0.010 meter, is less than k λ, therefore will process it; First the relevant dough sheet that finds A to order, i.e. dough sheet 1, dough sheet 2, dough sheet 3 and dough sheet 4, changes the coordinate figure on summit identical with A point coordinate on these four dough sheets into identical with B point, and the processing on this limit finishes; The inferior minor face that finds dough sheet 1 is limit CD, and its length is 0.010 meter, is also less than k λ, should do same processing, and two remaining edge lengths are greater than k λ, and this dough sheet processing finishes; Small structure for structure b place is done same processing; Then in judgment models, whether there is the not antenna on model surface of folding face and drop point, find that antenna I drop point, not at model surface, is moved down into model surface according to algorithm; In last judgment models, whether there is the dough sheet of n < 3, and deleted, simplify and finish.
The model of Fig. 5 after to simplify the process, can find out that two place's small structure have all passed through processing, meets the requirements.
Claims (3)
1. the geometric model small structure based on electromagnetism numerical evaluation is eliminated method for transformation, it is characterized in that: comprise the steps:
Step 101: information in model is read in to internal memory, and the dough sheet calculating in model is counted num1 and antenna number num2;
Step 102: establish variable i=0;
Step 103: first dough sheet from internal memory in reading model;
Step 104: calculate the number of vertex n of this dough sheet, and establish variable j=0;
Step 105:i=i+1;
Step 106: the four edges of dough sheet is read and by length sequence, obtained minor face and length of side a thereof;
Step 107: judge whether a is less than m, m=k λ, λ is wavelength, if a is less than m, forwards step 108 to; If a is more than or equal to m, forward step 112 to;
Step 108: make j=j+1;
Step 109: to the processing of minor face; Comprise the steps:
Step 201: read two terminal A of this minor face and the information of B;
Step 202: the relevant dough sheet that finds model mid point A;
Step 203: the apex coordinate value overlapping with A point in relevant dough sheet is revised as to the coordinate figure that B is ordered, processes minor face and finish;
Whether step 110:j is less than n, if so, forwards step 111 to; If not, forward step 112 to;
Step 111: obtain information and the length of side a thereof of time minor face and forward step 107 to;
Whether step 112:i is less than num1, if so, forwards step 113 to; If not, forward step 114 to;
Step 113: the next dough sheet from internal memory in reading model, forwards step 104 to;
Step 114: process folding face and antenna; Comprise the steps:
Step 301: first dough sheet from internal memory in reading model is also established i=0;
Step 302: whether the number of vertex n that judges this dough sheet is 4, if so, forwards step 303 to; If not, forward step 305 to;
Step 303: whether four summits that judge dough sheet are coplanar, if coplanar, forward step 305 to; If not coplanar, forward step 304 to;
Step 304: use shorter diagonal line that this dough sheet is divided into two triangles;
Step 305: judge whether i is less than num1, if so, forward step 306 to; If not, forward step 307 to;
Step 306: read next dough sheet from internal memory, forward step 302 to;
Step 307: first antenna from internal memory in reading model also established i=0;
Step 308: make i=i+1;
Step 309: whether drop point is on the surface of model to judge this antenna, if so, forwards step 313 to; If not, forward step 310 to;
Step 310: find the face crossing and nearest with its drop point with this antenna place straight line;
Step 311: this antenna place straight line and this face are asked to friendship, and the intersection point of trying to achieve is the new drop point of antenna;
Step 312: the increment of new drop point coordinate compared with original drop point is Δ, the original apex coordinate of antenna adds that Δ is the apex coordinate that this antenna is new;
Step 313: judge whether i is less than num2, if so, forward step 314 to; If not, the processing of foldable plane and antenna finishes;
Step 314: read the information of next root antenna from internal memory, forward step 308 to;
Step 115: first dough sheet from internal memory in reading model also makes i=0;
Step 116: whether the number of vertex n that judges this dough sheet is less than 3, if so, forwards step 117 to; If not, forward step 119 to;
Step 117: delete this dough sheet from model;
Step 118: make i=i+1;
Step 119: judge whether i is less than num1, if so, forward step 120 to; If not, algorithm finishes;
Step 120: the next dough sheet from internal memory in reading model, returns to step 116.
2. the geometric model small structure based on electromagnetism numerical evaluation according to claim 1 is eliminated method for transformation, it is characterized in that: the described relevant dough sheet that finds model mid point A is to all dough sheets take an A as summit.
3. the geometric model small structure based on electromagnetism numerical evaluation according to claim 1 is eliminated method for transformation, it is characterized in that: 4 coplanar determination methods of described step 303 are:
If four summits of dough sheet are respectively A, B, C, D, can form three vectors
with
if met
can determine that A, B, C, 4 of D are coplanar.
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Citations (2)
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|---|---|---|---|---|
| CN1858937A (en) * | 2006-04-30 | 2006-11-08 | 西安电子科技大学 | Automatic lattice dividing method for analyzing multiple antenna and scatterer structure by method of moment |
| CN101877022A (en) * | 2010-05-21 | 2010-11-03 | 西安电子科技大学 | Carrier antenna structure meshing method based on method of moment (MOM) for triangular vector basis function |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1858937A (en) * | 2006-04-30 | 2006-11-08 | 西安电子科技大学 | Automatic lattice dividing method for analyzing multiple antenna and scatterer structure by method of moment |
| CN101877022A (en) * | 2010-05-21 | 2010-11-03 | 西安电子科技大学 | Carrier antenna structure meshing method based on method of moment (MOM) for triangular vector basis function |
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| MOM Oriented Mesh Partition for Antenna and Scatter Body Structure;Shejiao Xu, et al.;《2nd International Workshop on Database Technology and Applications》;20101128;第1-5页 * |
| Shejiao Xu, et al..MOM Oriented Mesh Partition for Antenna and Scatter Body Structure.《2nd International Workshop on Database Technology and Applications》.2010,第1-5页. |
| 多天线-散射体结构矩量法分析的自动网格划分方法;许社教等;《工程图学学报》;20060228(第2期);第132-138页 * |
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