CN103593490A - Method for checking finite element model of shipping and ocean engineering structure - Google Patents
Method for checking finite element model of shipping and ocean engineering structure Download PDFInfo
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- CN103593490A CN103593490A CN201210295341.7A CN201210295341A CN103593490A CN 103593490 A CN103593490 A CN 103593490A CN 201210295341 A CN201210295341 A CN 201210295341A CN 103593490 A CN103593490 A CN 103593490A
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Abstract
The invention discloses a method for checking a finite element model of a shipping and ocean engineering structure. Following steps are carried out one by one based on each node in the model: 1, each node is a basal node, all basic units containing the basal nodes are firstly determined; 2, vectors are established respectively with all other nodes contained in the basic units and the basal nodes one by one in a coordinate under the model; 3, an included angle between every two vectors is calculated; and 4, if the calculated included angle is equal to or less than 15 degrees, the basal nodes are checked to have problems. By the aid of the method, computer software service can be achieved, conventional manual one-by-one node check is replaced, and error nodes can be quickly checked out by a computer. Therefore, design efficiency and design precision of the finite element model of the shipping and ocean engineering structure is greatly improved.
Description
Technical field
The present invention relates to the inspection technology of boats and ships or offshore engineering structure design phase, more particularly, relate to computer based inspection method for model after Finite Element Principle model.
Background technology
Ship's Dimension maximizes, boats and ships function is complicated, international convention standard renewal speed is accelerated, energy-conserving and environment-protective propose more requirements etc. to Ship Structure, all makes finite element analysis become the most important supplementary means of ship structure design.Some high added value ship types, as LNG ship, LPG ship, oversized container ship, need full ship modeling to carry out finite element analysis especially.While carrying out finite element analysis work, finite element modeling has occupied more than 50% working time, model is got over bulky complex, the situation that occurs modeling mistake is just more, in the urgent need to passing through technological means, avoid modeling mistake for the impact of analyzing conclusion, improve pattern checking efficiency, quick, accurate, effective inspection model quality.
Finite element method is one-piece construction to be divided into limited a plurality of unit are processed and a kind of general calculation method of computing.In boats and ships and offshore engineering structure finite element model, the most frequently used unit is bar unit and shell unit.Bar unit is comprised of 2 nodes conventionally, for simulating reinforcement; Shell unit conventionally 4 nodes, consists of or 3 nodes form, for analog board.Node has formed unit, and unit has formed whole model, therefore by inspection unit and node, can complete the inspection work of whole finite element model.
Summary of the invention
The present invention is applicable to the inspection work of boats and ships and offshore engineering structure finite element model, is intended to improve efficiency and the precision of Ship Structure finite element modeling.Mainly for elementary cell in model, the plate unit that forms line, bar element or 3-4 node composition as 2 nodes checks through row, thereby large ship and offshore engineering structure finite element model are realized to robotization inspection on the whole, improve design efficiency and precision.
In order to achieve the above object, the invention provides a kind of boats and ships and offshore engineering structure finite element model inspection method.Its basic demand is: model establishes, and the coordinate of each node is definite.Now, for each node in model, do one by one following inspection work:
Step1, each node are base node, first determine all elementary cells that comprise described base node;
Step2, by all other nodes that are included in described elementary cell, at model, under coordinate, sets up one by one respectively vectorial with described base node;
Between Step3, every two vectors, calculate angle;
If angle≤fundamental error angle that Step4 calculates, checks out described base node existing problems.
Under optimal way, described fundamental error angle is 15 °.Because in Finite Element Principle, a finite element unit, no matter be triangle or quadrilateral, just thinks if there is an angle to be less than 15 ° the unit that distorts.Get 15 ° and not only can detect Bar units match problem, Shell units match problem for criterion, distortion unit and low-angle Crack Element can also be detected.Therefore 15 ° is the more common standard in this area, and certainly for more special design software or design tool, it is set with and may changes, but these variations are all the variations based on same principle, should belong to equivalent way.
Boats and ships of the present invention and offshore engineering structure finite element model check technology, according to the design feature of ship and offshore structure thing and finite element model feature, summarize the universal law with model unit, node join dependency, use present technique can determine the model errors that does not meet this universal law, thereby carry out finite element model inspection.
Utilize method of the present invention, can realize computer software, thereby substitute the Traditional Man needs that node checks one by one, utilize the computing machine node that can fast detecting makes mistake.Design efficiency and the design accuracy of Ship Structure finite element modeling have greatly been improved.The present invention uses program/software of present technique, realize the irrealizable function of common commercial finite element software, for ship and offshore structure thing finite element model, check specially, especially when being applied to large-scale finite element model inspection, can fast and accurately choose modeling mistake, guarantee Correctness of model, avoided macroscopic poor efficiency and unreliability.The present invention can apply this technology and in business universal Software Platform, carry out secondary development, is embedded to the interactive interface of business common software in the form with " tool button " or " menu ", realizes the series function itself not possessing.Flush bonding module can adopt the secondary development language establishment of business common software itself, thereby makes this technology have adaptability and versatility widely.Except utilizing this technology, in business universal Software Platform, do secondary development, thereby utilize the graphics processing function of business common software itself more conveniently to realize outside graphical interaction, also can work out independently pattern checking software, read and store data and pass through text file format, as long as the Data of Finite Element Model with certain rule schemata record, all can use this program checkout, there is stronger versatility.
The present invention is according to the design feature of ship and offshore structure thing and finite element model feature, summarize the universal law with model unit, node join dependency, use present technique can determine the model errors that does not meet this universal law, thereby carry out finite element model inspection.Apply for feasibility and the validity of artificial verification technique, use present technique to work out stand-alone program, realized the irrealizable function of common commercial finite element software, for ship and offshore structure thing finite element model, check specially, especially when being applied to large-scale finite element model inspection, can fast and accurately choose modeling mistake, guarantee Correctness of model, avoid macroscopic poor efficiency and unreliability.
Accompanying drawing explanation
Fig. 1 is the in-problem the first form of elementary cell after Ship Structure finite element modeling in prior art, there is shown the situation that quadrilateral deteriorates to triangular element;
Fig. 2 is the in-problem the second form of elementary cell after Ship Structure finite element modeling in prior art, and in figure, bar unit does not break, and composes to non-conterminous two nodes;
Fig. 3 is in-problem the third form of elementary cell after Ship Structure finite element modeling in prior art, has occurred not belonging to a node of this unit in figure in Shell unit limit;
Fig. 4 is in-problem the 4th kind of form of elementary cell after Ship Structure finite element modeling in prior art, the unit inspection that distorts in figure, and the angle of element sides is less than 15 degree.
Fig. 5 is in-problem the 5th kind of form of elementary cell after Ship Structure finite element modeling in prior art, and in figure, low-angle Crack Element checks, crack angle is less than the Crack Element of 15 degree;
Fig. 6 is a kind of particular exam embodiment of finite element modeling;
Fig. 7 is check process schematic diagram of the present invention.
Embodiment
As shown in Figure 7, boats and ships of the present invention and offshore engineering structure finite element model inspection method, do following inspection work one by one for each node in model, obtains check result:
1, each node is base node, first determines all elementary cells that comprise described base node;
2,, by all other nodes that are included in described elementary cell, at model, under coordinate, set up one by one respectively vector with described base node;
3, between every two vectors, calculate angle;
If 4 angle≤15 ° of calculating, check out described base node existing problems.
Obtain after check result, can human intervention, process trouble node.Also can further for the secondary development software of various situation design specialized, realize and processing, further raise the efficiency.
Said method of the present invention, realizes by software implementation, and the model errors that mainly can check out has:
(1) degeneration inspection (quadrilateral deteriorate to triangular element, triangle deteriorate to line unit, line element degenerate is dot element), shown in accompanying drawing 1 is the situation that quadrilateral deteriorates to triangular element.
(2) Bar units match checks (bar unit does not break, and composes to non-conterminous two nodes), as shown in Figure 2.
(3) Shell units match checks (in a limit of unit, having occurred not belonging to a node of this unit), as shown in Figure 3
(4) distortion unit inspection (angle of element sides is less than 15 degree), as shown in Figure 4
(5) low-angle Crack Element checks (crack angle is less than the Crack Element of 15 degree), as shown in Figure 5
The core concept of degeneration inspection is: after having eliminated duplicate node, and all node coordinate information in extraction model, circular test node, if there is the consistent point of node coordinate, thinks that this puts corresponding unit is degeneration, should modify.
The inspection of Bar units match, the inspection of Shell units match, distortion unit inspection and low-angle Crack Element check that the core algorithm of these four kinds of model errors inspections is consistent, and this example of matching check with bar unit illustrates below.As shown in Figure 6, No. 3 unit is comprised of No. 1 node and No. 5 nodes finite element model, and it belongs to bar unit and does not break, and composes the situation on non-conterminous two nodes:
A) input parameter is unit information and nodal information in finite element model, unit by which node form, node serial number and node coordinate value (x, y, z), design parameter is as shown in the table.By node coordinate value, can obtain the vector that node forms between two, as shown in Figure 6 r
12the i.e. vector from node 1 to node 2.
B) fundamental formular: according to the basic parameter of input, can try to achieve the solution formula of the angle theta of node forms between two vectorial a and b
(when if θ is greater than 15 °, thinking that this node is no problem), wherein vectorial a and b are for pointing to any two vectors that node forms from same node, as the r in accompanying drawing 6
12with r
14.
C) step of algorithm:
1) from the spot check of No. 1 node to 6 node, No. 1 node of take is below example, and the content checking is described.
2) first find the unit that contains No. 1 node, from unit information, we can know that the unit that contains No. 1 node is No. 1 unit and No. 3 unit; Find behind the unit that contains No. 1 node, nodes all in No. 1 unit and No. 3 unit and No. 1 node are formed to vector, the vector forming in accompanying drawing 6 finite element models is: r
12=(1,0,0), r
13=(1 ,-1,0), r
14=(0 ,-1,0), r
15=(2,0,0).
3) by above-mentioned formula, try to achieve respectively r
12with r
13, r
12with r
14, r
12with r
15, r
13with r
14, r
13with r
15, r
14with r
15angle value between vector is 45 °, 90 °, 0 °, 45 °, 45 °, 90 ° between two.
4) to carrying out a little the inspection of 2-3 step in model, finally judge whether vector angle value is less than 15 °, if angle value is less than 15 °, it is wrong that we think that this puts corresponding unit, after spot check, vectorial r
12and r
15, r
52and r
51angle be 0 ° and be less than 15 °, so program think No. 1 and No. 5 nodes existing problems, we are connected with No. 5 nodes by No. 1 bar unit as we can see from the figure in fact, breaking at No. 2 Nodes, really have problems.
5) vector angle be take 15 ° as criterion, is because in Finite Element Principle, a finite element unit, no matter be triangle or quadrilateral, just thinks if there is an angle to be less than 15 ° the unit that distorts.Get 15 ° and not only can detect Bar units match problem, Shell units match problem for criterion, distortion unit and low-angle Crack Element can also be detected.
D) by above-mentioned algorithm inspection model, the needed basic parameter of program is few, and algorithm is simply accurate, therefore can go out modeling mistake by fast finding.For the model of 10,000 node left and right, the computing power based at present general computing machine, the time of searching only needs approximately 1 minute, and for the model of 80,000 node left and right, the time of searching needs approximately 15 minutes.
The above; it is only preferably embodiment of the present invention; but protection scope of the present invention is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; according to technical scheme of the present invention and inventive concept thereof, be equal to replacement or changed, within all should being encompassed in protection scope of the present invention.
Claims (2)
1. boats and ships and an offshore engineering structure finite element model inspection method, is characterized in that, for each node in model, does one by one following work:
S1, each node are base node, first determine all elementary cells that comprise described base node;
S2, by all other nodes that are included in described elementary cell, at model, under coordinate, sets up one by one respectively vectorial with described base node;
Between S3, every two vectors, calculate angle;
If angle≤fundamental error angle that S4 calculates, checks out described base node existing problems.
2. boats and ships and offshore engineering structure finite element model inspection method according to claim 1, is characterized in that, described fundamental error angle is 15 °.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040122630A1 (en) * | 2002-12-19 | 2004-06-24 | Wallace Ronald Hugh Fife | Method and apparatus for linking finite element models to computer-aided design models |
| CN102063555A (en) * | 2011-01-26 | 2011-05-18 | 河海大学 | Finite element numerical model debugging method based on grid structure |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040122630A1 (en) * | 2002-12-19 | 2004-06-24 | Wallace Ronald Hugh Fife | Method and apparatus for linking finite element models to computer-aided design models |
| CN102063555A (en) * | 2011-01-26 | 2011-05-18 | 河海大学 | Finite element numerical model debugging method based on grid structure |
Non-Patent Citations (2)
| Title |
|---|
| 徐金波: "板料成形有限元模拟前处理及应用技术研究", 《万方学术论文库》 * |
| 赵奎: "《有限元简明教程》", 30 September 2009, 北京：冶金工业出版社 * |
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Application publication date: 20140219 |