CN113722823B - Board gap pretreatment method suitable for finite element analysis of ship structure - Google Patents
Board gap pretreatment method suitable for finite element analysis of ship structure Download PDFInfo
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- 238000012216 screening Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 10
- 238000002955 isolation Methods 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000009958 sewing Methods 0.000 claims description 3
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Abstract
The invention discloses a plate seam pretreatment method suitable for finite element analysis of a ship structure, which comprises the following steps of S40: acquiring hull plate seam information from the three-dimensional CAD model, and creating a data model of the hull plate seam; s50: screening out the hull plate seams to be preprocessed according to parameters of a data model of the hull plate seams; s60: and simplifying the screened hull plate seams by adopting a simplifying method matched with the hull plate seams. According to the invention, classification and identification of the common elements of the hull plate seams are realized, and then the simplified method of summary is used for automatically simplifying various hull plate seams, so that the workload of designers is reduced, the efficiency and reliability of design analysis work are improved, and the design period is shortened.
Description
Technical Field
The invention relates to the technical field of hull plate seam pretreatment, in particular to a plate seam pretreatment method suitable for finite element analysis of a ship structure.
Background
Different stages in the ship design and construction process have different requirements on the three-dimensional model of the ship. The method comprises the following steps: in the structural design stage, the geometric information and attribute information of the ship structure are accurately expressed mainly by using a CAD model; in the structural strength verification stage, the CAE model must be used for finite element analysis calculation. The building of the CAE model of the ship structure mainly comprises two types of methods, namely, the modeling of the ship geometric structure and the division of the finite element grids are completed in a CAE system; the other is to directly grid the CAD model to generate the CAE model. For the first type of method, the modeling function of the CAE system is imperfect, so that the modeling efficiency of the ship structure is particularly low, but the subsequent grid dividing links can be fully considered in the modeling process, so that the quality of the generated grid is relatively good, and the malformed grid is low in duty ratio. For the second type of method, the modeling time can be greatly shortened, but more triangles or malformed grids exist in the generated CAE model, the specification requirement of finite element calculation cannot be met, and a large amount of manual intervention is needed. With the development of CAD/CAE integration, the ship design and construction based on a single digital model becomes an important research direction, and has the advantages of reducing repeated modeling and improving the efficiency of ship design and construction, wherein the rapid and accurate conversion of the CAD model into the CAE model is an extremely critical step.
The hull is welded from a plurality of steel plates and a plurality of plate seams are formed. The simplified processing of the plate seams is a very important task when generating a marine CAE model using a marine CAD model, which directly affects the meshing quality. At present, the simplification treatment of the plate seams is mainly finished by manpower, a great deal of time is required, and the quality is difficult to guarantee.
Disclosure of Invention
In view of the above, the invention aims to provide a plate seam pretreatment method suitable for finite element analysis of a ship structure, so as to solve the technical problem of long time consumption of the existing manual simplified plate seam.
The technical scheme adopted by the invention is as follows: a plate seam pretreatment method suitable for finite element analysis of ship structures comprises the following steps:
s40: acquiring hull plate seam information from the three-dimensional CAD model, and creating a data model of the hull plate seam;
s50: screening out the hull plate seams to be preprocessed according to parameters of the data model of the hull plate seams;
s60: and simplifying the screened hull plate seams by adopting a simplifying method matched with the hull plate seams.
Preferably, the step S40 includes:
s41: taking the ship plate seam information in the ship three-dimensional CAD model as an index, and creating a data model for the ship plate seam;
s42, searching two plates connected with a hull plate seam from the ship three-dimensional CAD model, and obtaining names PN and thickness PT of the two plates;
s43, acquiring an included angle AG of two plates, acquiring a starting point SCV1 and an ending point SCV2 of a plate suture line of a boundary calculation plate of the two plates, calculating a minimum distance SL between the plate suture line and the plate boundary, acquiring a reinforcing rib and a supporting plate structure parallel to the plate suture line in the two plates, respectively determining adjacent theoretical lines in the two plates, and extracting starting points OCV1, TCV1, ending points OCV2 and TCV2 of the two plates;
and S44, assignment of a data model of the hull plate seam is completed by using the data obtained in the steps S42 and S43.
Preferably, the S50 includes:
s51: acquiring an included angle AG of two plates connected with the hull plate seam according to a data model of the hull plate seam;
s52, judging the value of the included angle AG;
s53, if AG=0°, storing the hull plate seam into a plate seam set to be pretreated;
s54, if AG is not equal to 0 DEG and at least one of the minimum distances SL1 and SL2 from the plate seam to the two plate boundaries is smaller than a threshold value Td2, storing the hull plate seam into a plate seam set to be preprocessed.
Preferably, the step S60 includes:
s61, intensively extracting the hull plate seams from the plate seams to be pretreated, and determining the type of the hull plate seams according to the thicknesses PT of the two plates corresponding to the hull plate seams and the included angles AG between the two plates;
s62, adopting a corresponding simplification method to simplify the hull plate seams according to the types of the hull plate seams.
Preferably, the simplifying method in S62 includes:
when the hull plate seams are the hull plate seams which are horizontally connected and have the same plate thickness, judging the size relation between the distances ST1 and ST2 between the plate seams and the adjacent theoretical lines of the two plates and the threshold Td 1; if the threshold Td1 is minimum, simplification is not required; otherwise, adjusting the positions of the plate stitches to align the plate stitches with adjacent theoretical lines corresponding to smaller values in ST1 and ST2;
when the plate seams of the ship bodies are horizontally connected and the plate thicknesses are different, judging the size relation between the distances ST1 and ST2 between the plate seams and the adjacent theoretical lines of the two plates and the threshold Td 1; if the threshold Td1 is minimum, simplification is not required; otherwise, adjusting the positions of the plate stitching lines to align the plate stitching lines with adjacent theoretical lines corresponding to smaller values in ST1 and ST2, comparing the thicknesses PT1 and PT2 of the two plates, and replacing the thickness of the plates between the two adjacent theoretical lines of the two plates with the smaller value in PT1 and PT2;
when the hull plate seam is a reserved plate seam which is not horizontally connected, judging the size relation between the minimum distances SL1 and SL2 from the plate seam to the boundary of the two plates and a threshold value Td 2; if the value is smaller than the threshold value Td2, the plate between the plate seam line and the corresponding boundary is subjected to isolation treatment so as to be omitted when the subsequent grid division is performed.
Preferably, the method further comprises:
s10: acquiring common elements of the ship body plate joints to be preprocessed, and classifying the ship body plate joints according to the common elements;
s20: constructing a general data structure of the hull plate seam according to the acquired common elements of the hull plate seam;
s30: and establishing a pretreatment method for various hull plate joints.
Preferably, the step S10 includes:
s11, obtaining common elements: acquiring name parameters PN of two plates connected with a hull plate seam; obtaining plate thickness parameters PT of two plates connected by a hull plate seam; acquiring angle parameters AG of two plates connected with a hull plate seam; acquiring a length parameter SL from a hull plate seam to a plate boundary; acquiring a length parameter ST of a hull plate seam to an adjacent theoretical line;
s12, obtaining a plate suture: the plate seam is a two-dimensional geometric representation of the hull plate seam, and each plate seam is extracted according to a three-dimensional model of two plates connected with the corresponding hull plate seam;
s13, acquiring adjacent theoretical lines: the adjacent theoretical lines are two-dimensional track lines of the trend of the reinforcing ribs and the supporting plates in the two plates connected by the hull plate seams, and the adjacent theoretical lines closest to the plate seams in the two plates are obtained.
S14, classification of hull plate seams: based on the spatial position relation AG and the plate thickness PT of two plates connected by the ship plate seam, dividing the ship plate seam to be pretreated into a plate seam which is horizontally connected and has the same plate thickness, a plate seam which is horizontally connected and has different plate thicknesses and a remaining plate seam which is not horizontally connected;
preferably, the S20 includes:
s21: common elements contained in the generic data structure include: the name PN1 of the first plate in the two plates connected by the hull plate seam; the name PN2 of the second plate in the two plates connected by the hull plate seam; the thickness PT1 of the first plate in the two plates connected by the hull plate seam; the thickness PT2 of the second plate in the two plates connected by the hull plate seam; an included angle AG between two plates connected by a hull plate seam; the minimum distance SL1 of the panel stitch to the first panel boundary; a minimum distance SL2 of the panel stitch to the second panel boundary; the distance ST1 of the panel seam to the adjacent theoretical line of the first panel; the distance ST2 of the panel seam to the adjacent theoretical line of the second panel;
the generic data structure contains panel stitching parameters including: spatial coordinate values SCV1 and SCV2 of the start point and the end point of the panel suture;
the general data structure contains adjacent theoretical line parameters including: spatial coordinate values OCV1 and OCV2 of the first plate adjacent to the start point and the end point of the theoretical line; spatial coordinate values TCV1 and TCV2 of the start point and the end point of the second plate adjacent to the theoretical line;
s22, defining common elements, plate sewing lines and data types adjacent to theoretical lines under a general data structure;
wherein the names of the common elements, the plate stitching lines and the adjacent theoretical lines are character strings; the names of the first plate and the second plate connected with the hull plate seam are character strings; the thicknesses of the first plate and the second plate connected with the hull plate seam are real numbers; the included angle between the first plate and the second plate connected with the hull plate seam is real; the minimum distance from the seam line to the boundary between the first plate and the second plate is real; the distance from the plate stitching line to the adjacent theoretical lines of the first plate and the second plate is real; the space coordinate values of the starting point and the end point of the plate suture are real numbers; the spatial coordinate values of the start point and the end point of the first plate and the second plate adjacent to the theoretical line are real numbers.
Preferably, the S30 includes:
s31, for the ship body plate seams which are horizontally connected and have the same plate thickness, judging the size relation between the distances ST1 and ST2 between the plate seams and the adjacent theoretical lines of the two plates and a threshold Td1, if the threshold Td1 is minimum, simplifying is not needed, otherwise, adjusting the positions of the plate seams to enable the plate seams to be aligned with the adjacent theoretical lines corresponding to smaller values in ST1 and ST2;
s32, for the plate seams which are horizontally connected and have different plate thicknesses, judging the size relation between the distances ST1 and ST2 between the plate seams and adjacent theoretical lines of the two plates and a threshold Td1, if the threshold Td1 is minimum, simplifying the plate seam, otherwise, adjusting the position of the plate seam to align the plate seam with the adjacent theoretical lines corresponding to the smaller value in ST1 and ST2, comparing the sizes of PT1 and PT2, and replacing the thickness of the plate between the two adjacent theoretical lines of the first plate and the second plate with the smaller value in PT1 and PT2;
s33, regarding the remaining plate seams which are not horizontally connected, judging the magnitude relation between the minimum distances SL1 and SL2 between the plate seams and the boundaries of the two plates and the threshold Td2, and if the minimum distances SL2 are smaller than the threshold Td2, performing isolation treatment on the plates between the plate seams and the corresponding boundaries.
Preferably, the method further comprises S70, wherein the pretreated ship simplified model is checked by adopting manual checking or by means of a third party tool and then stored.
The invention has the beneficial effects that:
according to the invention, classification and identification of the common elements of the hull plate seams are realized, and then the simplified method of summary is used for automatically simplifying various hull plate seams, so that the workload of designers is reduced, the efficiency and reliability of design analysis work are improved, and the design period is shortened.
Drawings
FIG. 1 is a schematic flow chart of the present invention;
figure 2 illustrates three types of hull plate seams in an embodiment of the invention.
The reference numerals in the drawings illustrate:
10-plate suture; 11-a first sheet material; 12-a second plate;
20-adjacent theoretical line; 21-reinforcing ribs; 22-supporting plate.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and are not intended to be limiting.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
An embodiment, as shown in fig. 1 and fig. 2, is a plate seam pretreatment method suitable for finite element analysis of a ship structure, and the method is used for automatic pretreatment of a ship body plate seam so as to improve the working efficiency and ensure the pretreatment quality of the plate seam. The pretreatment method comprises the following steps:
s10: and obtaining common elements of the ship body plate seams to be preprocessed, and classifying the ship body plate seams according to the common elements.
Specifically, S10 includes:
s11, obtaining common elements: acquiring name parameters PN of two plates connected with a hull plate seam; obtaining plate thickness parameters PT of two plates connected by a hull plate seam; acquiring angle parameters AG of two plates connected with a hull plate seam; acquiring a length parameter SL from a hull plate seam to a plate boundary; the length parameter ST of the hull plate seam to the adjacent theoretical line 20 is obtained.
S12, acquiring the plate suture 10: the panel seams 10 are two-dimensional geometric representations of the hull panel seams, and each panel seam 10 is extracted according to a three-dimensional model of two panels connected by the corresponding hull panel seam.
S13, acquisition adjacent to the theoretical line 20: the adjacent theoretical line 20 is a two-dimensional track line of the trend of the reinforcing ribs 21 and the supporting plates 22 in the two plates connected by the hull plate seam, and the adjacent theoretical line 20 closest to the plate seam 10 on the two plates is obtained.
S14, classification of hull plate seams: as shown in fig. 2, the ship body plate slits to be pretreated are divided into three types of plate slits which are horizontally connected and have the same plate thickness, plate slits which are horizontally connected and have different plate thicknesses and remaining plate slits which are not horizontally connected according to the spatial position relation AG and the plate thickness PT of the two plates connected by the ship body plate slits;
s20: and constructing a general data structure of the hull plate seam according to the acquired common elements of the hull plate seam.
Specifically, S20 includes:
s21: common elements contained in the generic data structure include: the name PN1 of the first plate 11 in the two plates connected by the hull plate seam; the name PN2 of the second plate 12 in the two plates connected by the hull plate seam; the thickness PT1 of the first plate 11 in the two plates connected by the hull plate seam; the thickness PT2 of the second plate 12 in the two plates connected by the hull plate seam; an included angle AG between two plates connected by a hull plate seam; the minimum distance SL1 of the panel seam 10 to the boundary of the first panel 11; the minimum distance SL2 of the panel seam 10 to the boundary of the second panel 12; the distance ST1 of the panel thread 10 to the adjacent theoretical line 20 of the first panel 11; the distance ST2 of the panel seam line 10 to the adjacent theoretical line 20 of the second panel 12;
the generic data structure contains panel stitching 10 parameters including: spatial coordinate values SCV1 and SCV2 of the start and end points of the panel thread 10;
the general data structure contains adjacent theoretical line 20 parameters including: the spatial coordinate values OCV1 and OCV2 of the first sheet material 11 adjacent to the start and end points of the theoretical line 20; spatial coordinate values TCV1 and TCV2 of the second sheet material 12 adjacent to the start and end points of the theoretical line 20;
s22, defining common elements, plate sewing threads 10 and data types adjacent to the theoretical threads 20 under a general data structure;
wherein the names of the common elements, the plate suture 10 and the adjacent theoretical line 20 are character strings; the names of the first plate 11 and the second plate 12 connected by the hull plate seam are character strings; the thicknesses of the first plate 11 and the second plate 12 connected by the hull plate seam are real numbers; the included angle between the first plate 11 and the second plate 12 connected with the hull plate seam is real; the minimum distance from the seam line 10 to the boundary between the first plate 11 and the second plate 12 is real; the distance of the panel seam 10 from the adjacent theoretical line 20 of the first panel 11 and the second panel 12 is real; the spatial coordinate values of the start point and the end point of the panel thread 10 are real; the spatial coordinate values of the first sheet material 11 and the second sheet material 12 adjacent to the start point and the end point of the theoretical line 20 are real numbers.
S30: and establishing pretreatment rules and simplifying methods of various hull plate joints.
Specifically, S30 includes:
s31, judging the magnitude relation between ST1, ST2 and a threshold value Td1 for the hull plate joints which are horizontally connected and have the same plate thickness; if the threshold Td1 is minimal then no simplification is required, otherwise the plate stitch 10 position is adjusted so that the plate stitch 10 is aligned with the adjacent theoretical line 20 corresponding to the smaller of ST1 and ST 2.
S32, judging the size relation between ST1, ST2 and a threshold value Td1 for the plate joints of the ship bodies which are horizontally connected and have different plate thicknesses; if the threshold Td1 is minimum, no simplification is required, otherwise the position of the panel seam 10 is adjusted so that the panel seam 10 is aligned with the adjacent theoretical line 20 corresponding to the smaller value of ST1 and ST2, while comparing the magnitudes of PT1 and PT2, and the thickness of the panel between the two adjacent theoretical lines 20 of the first panel 11 and the second panel 12 is replaced with the smaller value of PT1 and PT 2.
S33, judging the size relation between SL1, SL2 and threshold Td2 for the remaining plate seams which are not horizontally connected; if the value is smaller than the threshold value Td2, the plate between the plate seam 10 and the corresponding boundary is subjected to isolation treatment, so that the plate seam is ignored in the subsequent grid division, namely, the remaining plate seam is not subjected to grid division in the finite element analysis; if the threshold value Td2 is larger than or equal to the threshold value Td2, simplification is not needed, namely, the reserved plate seam is directly meshed in the finite element analysis.
S40: and acquiring the ship body plate seam information from the three-dimensional CAD model, and creating a data model of the ship body plate seam.
Specifically, S40 includes:
s41: taking the ship plate seam information in the ship three-dimensional CAD model as an index, and creating a data model for the ship plate seam;
s42, searching two plates connected with a hull plate seam from the ship three-dimensional CAD model, and obtaining names PN and thickness PT of the two plates;
s43, acquiring an included angle AG of the two plates, acquiring a starting point SCV1 and an ending point SCV2 of a plate seam 10 of the boundary of the two plates, calculating the minimum distance SL between the plate seam 10 and the boundary of the plates, acquiring structures of a reinforcing rib 11 and a supporting plate 12 which are parallel to the plate seam 10 in the two plates, respectively determining adjacent theoretical lines 20 of the two plates, and extracting starting points OCV1, TCV1 and ending points OCV2 and TCV2 of the two plates;
and S44, assignment of a data model of the hull plate seam is completed by using the data obtained in the steps S42 and S43.
S50: and screening out the hull plate seams to be preprocessed according to parameters of the data model of the hull plate seams.
Specifically, S50 includes:
s51: acquiring an included angle AG of two plates connected with the hull plate seam according to a data model of the hull plate seam;
s52, judging the value of the included angle AG;
s53, if AG=0°, storing the hull plate seam into a plate seam set to be pretreated;
s54, if AG is not equal to 0 DEG and at least one of the minimum distances SL1 and SL2 from the plate seam line 10 to the two plate boundaries is smaller than the threshold value Td2, the plate seam of the ship body is stored in the plate seam set to be preprocessed.
S60: and simplifying the screened hull plate seams by adopting a simplifying method matched with the hull plate seams.
Specifically, S60 includes:
s61, intensively extracting the hull plate seams from the plate seams to be pretreated, and determining the type of the hull plate seams according to the thicknesses of the two plates corresponding to the hull plate seams and the included angle between the two plates;
s62, selecting the simplification method established in S30 according to the type of the hull plate seam to simplify the hull plate seam.
Wherein:
when the hull plate seams are the hull plate seams which are horizontally connected and have the same plate thickness, judging the size relation of distances ST1 and ST2 from the plate seam 10 to the adjacent theoretical lines 20 of the two plates and a threshold value Td 1; if the threshold Td1 is minimum, simplification is not required; otherwise, adjusting the position of the plate suture 10 to align the plate suture 10 with the adjacent theoretical line 20 corresponding to the smaller value of ST1 and ST2;
when the plate seams of the ship bodies are horizontally connected and the plate thicknesses are different, judging the size relation between the distances ST1 and ST2 between the plate seam 10 and the adjacent theoretical lines 20 of the two plates and the threshold Td 1; if the threshold Td1 is minimum, simplification is not required; otherwise, adjusting the position of the plate stitching line 10 to align the plate stitching line 10 with the adjacent theoretical line 20 corresponding to the smaller value in ST1 and ST2, comparing the thicknesses PT1 and PT2 of the two plates, and replacing the thickness of the plate between the two adjacent theoretical lines 20 of the two plates with the smaller value in PT1 and PT2;
when the hull plate seam is a reserved plate seam which is not horizontally connected, judging the size relation between the minimum distances SL1 and SL2 from the plate seam 10 to the boundaries of the two plates and a threshold Td 2; if the value is smaller than the threshold value Td2, the plate between the plate seam line 10 and the corresponding boundary is subjected to isolation treatment so as to be ignored in the subsequent grid division; if it is equal to or greater than the threshold Td2, simplification is not necessary.
S70, checking the preprocessed ship simplified model by adopting manual checking or by means of a third-party tool, and then storing the preprocessed ship simplified model for subsequent finite element meshing.
Compared with the prior art, the application has the following technical effects:
according to the method, common elements of the hull plate seams needing to be preprocessed are combed, a general data structure for describing the hull plate seams is constructed, a hull plate seam preprocessing rule and a simplification method are established, a data model is established for each hull plate seam, the hull plate seams needing to be preprocessed are screened out, the corresponding preprocessing method is automatically selected, the hull plate seams are simplified, the hull plate seams are automatically simplified, a ship CAD simplified model meeting the requirement of finite element grid division is obtained, the preprocessed ship CAD simplified model can be utilized to conduct finite element grid division when the ship structural strength is verified, the quick generation of the ship finite element model is achieved, repeated modeling in the middle process is reduced, the design efficiency and the design accuracy are improved, and the design period is shortened.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.
Claims (9)
1. The plate seam pretreatment method suitable for finite element analysis of the ship structure is characterized by comprising the following steps of:
s40: acquiring hull plate seam information from the three-dimensional CAD model, and creating a data model of the hull plate seam;
s50: screening out the hull plate seams to be preprocessed according to parameters of the data model of the hull plate seams;
s60: selecting a simplified method matched with the hull plate seams to simplify the screened hull plate seams;
wherein the simplification method comprises the following steps:
when the hull plate seams are the hull plate seams which are horizontally connected and have the same plate thickness, judging the size relation between the distances ST1 and ST2 between the plate seam (10) and the adjacent theoretical lines (20) of the two plates and the threshold Td 1; if the threshold Td1 is minimum, simplification is not required; otherwise, adjusting the position of the plate suture (10) to align the plate suture (10) with an adjacent theoretical line (20) corresponding to the smaller value of ST1 and ST2;
when the plate seams of the ship bodies are horizontally connected and the plate thicknesses are different, judging the size relation between the distances ST1 and ST2 between the plate seam (10) and the adjacent theoretical lines (20) of the two plates and the threshold Td 1; if the threshold Td1 is minimum, simplification is not required; otherwise, adjusting the positions of the plate stitching lines (10), enabling the plate stitching lines (10) to be aligned with adjacent theoretical lines (20) corresponding to smaller values in ST1 and ST2, comparing the thicknesses PT1 and PT2 of the two plates, and replacing the thickness of the plates between the two adjacent theoretical lines (20) of the two plates with the smaller value in PT1 and PT2;
when the hull plate seam is a reserved plate seam which is not horizontally connected, judging the size relation between the minimum distances SL1 and SL2 from the plate seam (10) to the boundaries of the two plates and a threshold Td 2; if the value is smaller than the threshold value Td2, the plate material between the plate seam line (10) and the corresponding boundary is subjected to isolation treatment.
2. A board slit pretreatment method suitable for finite element analysis of ship structures according to claim 1, wherein S40 comprises:
s41: taking the ship plate seam information in the ship three-dimensional CAD model as an index, and creating a data model for the ship plate seam;
s42, searching two plates connected with a hull plate seam from the ship three-dimensional CAD model, and obtaining names PN and thickness PT of the two plates;
s43, acquiring an included angle AG of two plates, acquiring a starting point SCV1 and an ending point SCV2 of a boundary calculation plate seam (10) of the two plates, calculating a minimum distance SL between the plate seam (10) and the boundary of the plates, acquiring structures of a reinforcing rib (21) and a supporting plate (22) which are parallel to the plate seam (10) in the two plates, respectively determining adjacent theoretical lines (20) of the two plates, and extracting starting points OCV1, TCV1, ending points OCV2 and TCV2 of the two plates;
and S44, assignment of a data model of the hull plate seam is completed by using the data obtained in the steps S42 and S43.
3. A board slit pretreatment method suitable for finite element analysis of ship structures according to claim 2, wherein said S50 comprises:
s51: acquiring an included angle AG of two plates connected with the hull plate seam according to a data model of the hull plate seam;
s52, judging the value of the included angle AG;
s53, if AG=0°, storing the hull plate seam into a plate seam set to be pretreated;
s54, if AG is not equal to 0 DEG and at least one of the minimum distances SL1 and SL2 from the plate seam line (10) to the two plate boundaries is smaller than a threshold value Td2, storing the hull plate seam into a plate seam set to be preprocessed.
4. A board slit pretreatment method suitable for finite element analysis of ship structures according to claim 3, wherein said S60 comprises:
s61, extracting the hull plate seams from the plate seams to be pretreated in a concentrated mode, and determining the type of the hull plate seams according to the thicknesses PT of the two plates corresponding to the hull plate seams and the included angle AG between the two plates.
5. A panel seam pretreatment method suitable for finite element analysis of a marine structure according to any of claims 1-4, further comprising:
s10: acquiring common elements of the ship body plate joints to be preprocessed, and classifying the ship body plate joints according to the common elements;
s20: constructing a general data structure of the hull plate seam according to the acquired common elements of the hull plate seam;
s30: and establishing a pretreatment method for various hull plate joints.
6. The board slit pretreatment method for finite element analysis of ship structure according to claim 5, wherein S10 comprises:
s11, obtaining common elements: acquiring name parameters PN of two plates connected with a hull plate seam; obtaining plate thickness parameters PT of two plates connected by a hull plate seam; acquiring angle parameters AG of two plates connected with a hull plate seam; acquiring a length parameter SL from a hull plate seam to a plate boundary; acquiring a length parameter ST of a hull plate seam to an adjacent theoretical line;
s12, obtaining the plate suture (10): the plate seam lines (10) are two-dimensional geometric representations of the plate seams of the ship body, and each plate seam line (10) needs to be extracted according to a three-dimensional model of two plates connected with the corresponding plate seam line of the ship body;
s13, acquiring adjacent to a theoretical line (20): the adjacent theoretical line (20) is a two-dimensional track line of the trend of the reinforcing ribs (21) and the supporting plates (22) in two plates connected with the hull plate seam, and the adjacent theoretical line (20) closest to the plate seam (10) in the two plates is obtained;
s14, classification of hull plate seams: based on the spatial position relation AG and the plate thickness PT of two plates connected by the ship plate seam, the ship plate seam to be pretreated is divided into a plate seam which is horizontally connected and has the same plate thickness, a plate seam which is horizontally connected and has different plate thicknesses and a remaining plate seam which is not horizontally connected.
7. The board slit pretreatment method for finite element analysis of ship structure according to claim 5, wherein S20 comprises:
s21: common elements contained in the generic data structure include: the name PN1 of a first plate (11) in the two plates connected by the hull plate seam; the name PN2 of the second plate (12) in the two plates connected by the hull plate seam; the thickness PT1 of a first plate (11) in the two plates connected by the hull plate seam; the thickness PT2 of the second plate (12) in the two plates connected by the hull plate seam; an included angle AG between two plates connected by a hull plate seam; a minimum distance SL1 from the panel seam (10) to the boundary of the first panel (11); a minimum distance SL2 of the panel seam (10) to the boundary of the second panel (12); a distance ST1 of the panel seam (10) from the first panel (11) adjacent to the theoretical line (20); a distance ST2 of the panel seam (10) from the second panel (12) adjacent the theoretical line (20);
the generic data structure contains panel stitching (10) parameters including: spatial coordinate values SCV1 and SCV2 of the start point and the end point of the panel thread (10);
the generic data structure contains adjacent theoretical line (20) parameters including: spatial coordinate values OCV1 and OCV2 of the first sheet material (11) adjacent to the start point and the end point of the theoretical line (20); spatial coordinate values TCV1 and TCV2 of the second sheet material (12) adjacent to the start point and the end point of the theoretical line (20);
s22, defining common elements, plate sewing threads (10) and data types adjacent to the theoretical threads (20) under a general data structure;
wherein the names of the common elements, the plate suture (10) and the adjacent theoretical lines (20) are character strings; the names of the first plate (11) and the second plate (12) connected with the hull plate seam are character strings; the thicknesses of the first plate (11) and the second plate (12) connected with the hull plate seam are real numbers; the included angle between the first plate (11) and the second plate (12) connected with the hull plate seam is real; the minimum distance from the seam line (10) to the boundary between the first plate (11) and the second plate (12) is real; the distance from the seam line (10) to the adjacent theoretical line (20) of the first plate (11) and the second plate (12) is real; the spatial coordinate values of the starting point and the end point of the plate suture line (10) are real numbers; the spatial coordinate values of the first plate (11) and the second plate (12) adjacent to the start point and the end point of the theoretical line (20) are real.
8. The board slit pretreatment method for finite element analysis of ship structure according to claim 5, wherein S30 comprises:
s31, for the ship plate seams which are horizontally connected and have the same plate thickness, judging the size relation between the distances ST1 and ST2 between the plate seam (10) and the adjacent theoretical lines (20) of the two plates and a threshold value Td1, if the threshold value Td1 is minimum, no simplification is needed, otherwise, the positions of the plate seam (10) are adjusted, and the plate seam (10) is aligned with the adjacent theoretical lines (20) corresponding to the smaller values in the ST1 and the ST2;
s32, for the plate seams which are horizontally connected and have different plate thicknesses, judging the size relation between the distances ST1 and ST2 between the plate seam (10) and the adjacent theoretical lines (20) of the two plates and a threshold value Td1, if the threshold value Td1 is minimum, no simplification is needed, otherwise, adjusting the position of the plate seam (10), enabling the plate seam (10) to be aligned with the adjacent theoretical line (20) corresponding to the smaller value in the ST1 and the ST2, comparing the sizes of PT1 and PT2, and replacing the thickness of the plate between the two adjacent theoretical lines (20) of the first plate (11) and the second plate (12) with the smaller value in PT1 and PT2;
s33, regarding the remaining plate seams which are not connected horizontally, judging the magnitude relation between the minimum distances SL1 and SL2 from the plate seam (10) to the two plate material boundaries and the threshold Td2, and if the magnitude relation is smaller than the threshold Td2, performing isolation treatment on the plate material between the plate seam (10) and the corresponding boundaries.
9. A panel seam pre-treatment method suitable for finite element analysis of a marine structure according to any of claims 6-8, further comprising S70, wherein the pre-treated simplified model of the marine structure is inspected manually or by means of a third party tool and then stored.
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