CN113722823A - Plate seam pretreatment method suitable for finite element analysis of ship structure - Google Patents
Plate seam pretreatment method suitable for finite element analysis of ship structure Download PDFInfo
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Abstract
The invention discloses a plate seam pretreatment method suitable for finite element analysis of a ship structure, which belongs to a ship body plate seam pretreatment technology, and 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 hull plate seams needing to be preprocessed according to parameters of a data model of the hull plate seams; s60: and simplifying the screened ship body plate seams by selecting a simplifying method matched with the ship body plate seams. The invention firstly realizes the classification of the ship body plate seams by classifying and identifying the common elements of the ship body plate seams, and then automatically simplifies and processes various ship body plate seams by a simplifying method of summarizing and summarizing, thereby reducing the workload of designers, improving the efficiency and reliability of design analysis work and shortening the design period.
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 requirements are imposed on the three-dimensional model of the ship at different stages in the design and construction process of the ship. The method comprises the following specific steps: in the structural design stage, a CAD model is mainly used for accurately expressing geometric information and attribute information of a ship structure; and in the structural strength verification stage, finite element analysis calculation must be carried out by using a CAE model. The establishment of the ship structure CAE model mainly comprises two methods, one is to complete the modeling of the ship geometric structure and the division of finite element meshes in a CAE system; another type is to directly mesh the CAD model to generate the CAE model. For the first method, the modeling function of the CAE system is not complete, so that the efficiency of ship structure modeling is particularly low, but the subsequent mesh division links can be fully considered in the modeling process, so that the generated mesh quality is relatively good, and the deformed mesh ratio is low. For the second method, although the modeling time can be greatly shortened, the generated CAE model has more triangular or malformed meshes, which cannot meet the specification requirements of finite element calculation, and a large amount of manual intervention is required. With the development of CAD/CAE integration, ship design and construction based on a single digital model becomes an important research direction, and the ship design and construction method has the advantages of reducing repeated modeling and improving the efficiency of ship design and construction, wherein the CAE model is generated by quickly and accurately converting the CAD model as a crucial step.
The ship body is formed by welding a plurality of steel plates and a plurality of plate seams are formed. When a ship CAE model is generated by utilizing a ship CAD model, the simplification processing of the plate seam is very important work, and the simplification processing directly influences the grid dividing quality. At present, the simplification treatment of the plate seam is mainly completed manually, a large amount of time is consumed, and the quality is difficult to ensure.
Disclosure of Invention
In view of the above, the present invention provides a plate joint preprocessing method suitable for finite element analysis of a ship structure, so as to solve the technical problem of long time consumption in manually simplifying plate joints.
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 hull plate seams needing to be preprocessed according to parameters of the data model of the hull plate seams;
s60: and simplifying the screened ship body plate seams by selecting a simplifying method matched with the ship body plate seams.
Preferably, the S40 includes:
s41: establishing a data model for the ship plate seam by taking the ship plate seam information in the ship three-dimensional CAD model as an index;
s42, searching two plates connected with a ship body plate seam from the ship three-dimensional CAD model, and obtaining the name PN and the thickness PT of the two plates;
s43, obtaining an included angle AG of the two boards, obtaining the boundary of the two boards, calculating a starting point SCV1 and an end point SCV2 of a board sewing line, calculating the minimum distance SL from the board sewing line to the boundary of the boards, obtaining reinforcing ribs and supporting plate structures which are parallel to the board sewing line in the two boards, respectively determining adjacent theoretical lines in the two boards and extracting the starting point OCV1, TCV1, the end point OCV2 and the end point OCV2 of the two boards;
and S44, finishing assignment of the data model of the ship plate seam by using the data obtained in S42 and S43.
Preferably, the S50 includes:
s51: acquiring an included angle AG of two plates connected with a ship body plate seam according to a data model of the ship body plate seam;
s52, judging the value of the included angle AG;
s53, if AG is equal to 0 degree, storing the ship body plate seam into a plate seam set to be preprocessed;
and S54, if AG is not equal to 0 degrees, and at least one of the minimum distances SL1 and SL2 from the board seams to the boundaries of the two boards is smaller than a threshold value Td2, storing the ship board seams into a board seam set to be pretreated.
Preferably, the S60 includes:
s61, intensively extracting ship body plate seams from the plate seams to be pretreated, and determining the types of the ship body plate seams according to the thicknesses PT of the two plates corresponding to the ship body plate seams and the included angle AG between the two plates;
and S62, simplifying the ship body plate seams by adopting a corresponding simplifying method according to the type of the ship body plate seams.
Preferably, the simplified method in S62 includes:
when the ship hull plate seams are horizontally connected and have the same plate thickness, judging the size relation between the distances ST1 and ST2 from the plate seam lines to the adjacent theoretical lines of the two plates and a threshold Td 1; if the threshold Td1 is minimal, then simplification is not required; otherwise, adjusting the position of the plate suture line to align the plate suture line with the adjacent theoretical line corresponding to the smaller value of ST1 and ST 2;
when the ship hull plate seams are horizontally connected and have different plate thicknesses, judging the size relationship between the distances ST1 and ST2 from the plate seam lines to the adjacent theoretical lines of the two plates and a threshold Td 1; if the threshold Td1 is minimal, then simplification is not required; otherwise, adjusting the position of the plate seam line to align the plate seam line with an adjacent theoretical line corresponding to the smaller value of 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 of the two plates with the smaller value of PT1 and PT 2;
when the ship hull plate seam is a residual 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 two plates and a threshold value Td 2; if less than the threshold Td2, the sheet material between the sheet stitches and the corresponding boundaries is isolated for subsequent grid division to be ignored.
Preferably, the method further comprises the following steps:
s10: acquiring common elements of the ship body plate seams to be pretreated, and classifying the ship body plate seams according to the common elements;
s20: constructing a universal data structure of the ship plate seam according to the acquired common elements of the ship plate seam;
s30: and (3) establishing a pretreatment method for various ship body plate seams.
Preferably, the S10 includes:
s11, obtaining common elements: acquiring name parameters PN of two plates connected with a plate seam of a ship body; acquiring a plate thickness parameter PT of two plates connected with a ship body plate seam; obtaining an angle parameter AG of two plates connected with a ship body plate seam; acquiring a length parameter SL from a ship body plate seam to a plate boundary; acquiring a length parameter ST from a ship body plate seam to an adjacent theoretical line;
s12, obtaining plate suture: the plate seam lines are two-dimensional geometric representations of the plate seams of the ship body, and each plate seam line needs to be extracted according to a three-dimensional model of two plates connected with the corresponding plate seam of the ship body;
s13, adjacent theoretical line acquisition: the adjacent theoretical lines are two-dimensional trajectory lines of the reinforcing ribs and the supporting plate trends in the two plates connected by the ship body plate seam, and the adjacent theoretical lines which are respectively closest to the plate seam lines in the two plates are obtained.
S14, classification of ship plate seams: dividing the ship body plate seam to be preprocessed 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 residual plate seam which is not horizontally connected according to the spatial position relation AG and the plate thickness PT of two plates connected with the ship body plate seam;
preferably, the S20 includes:
s21: common elements included in the generic data structure include: the name PN1 of the first plate in the two plates connected by the ship body plate seam; the name PN2 of the second plate in the two plates connected by the ship body plate seam; the thickness PT1 of the first plate in the two plates connected by the ship body plate seam; the thickness PT2 of the second plate in the two plates connected by the ship body plate seam; an included angle AG between two plates connected by a ship body plate seam; the minimum distance SL1 from the panel seam to the first panel boundary; the minimum distance SL2 from the panel seam to the second panel boundary; distance ST1 of the panel seam line to the adjacent theoretical line of the first panel; distance ST2 of the panel seam line to the adjacent theoretical line of the second panel;
the generic data structure contains panel stitch parameters including: the spatial coordinate values SCV1 and SCV2 of the start and end points of the plate stitches;
the generic data structure contains adjacent theoretical line parameters including: spatial coordinate values OCV1 and OCV2 of the starting point and the ending point of the adjacent theoretical line of the first plate material; the spatial coordinate values TCV1 and TCV2 of the starting point and the ending point of the adjacent theoretical line of the second sheet material;
s22, defining data types of common elements, plate seam lines and adjacent theoretical lines under a general data structure;
wherein the names of the common elements, the plate seam lines and the adjacent theoretical lines are character string type; the name of the first plate and the name of the second plate which are connected with the ship body plate seam are character string type; the thickness of the first plate and the second plate connected with the ship body plate seam is real; the included angle between the first plate and the second plate connected with the ship body plate seam is real; the minimum distance from the plate sewing line to the boundary of the first plate and the second plate is a real number type; the distance from the plate sewing line to the adjacent theoretical line of the first plate and the second plate is real; the spatial coordinate values of the starting point and the end point of the plate stitch line are real number type; the spatial coordinate values of the starting point and the ending point of the adjacent theoretical line of the first plate and the second plate are real.
Preferably, the S30 includes:
s31, judging the size relation between the distances ST1 and ST2 from the plate seam to the adjacent theoretical lines of the two plates and a threshold value Td1 for the ship body plate seams which are horizontally connected and have the same plate thickness, wherein if the threshold value Td1 is the minimum, simplification is not needed, otherwise, the position of the plate seam line is adjusted, and the plate seam line is aligned with the adjacent theoretical line corresponding to the smaller value of ST1 and ST 2;
s32, for horizontally connected plate seams with different plate thicknesses, judging the size relationship between the distances ST1 and ST2 from the plate seam lines to the adjacent theoretical lines of the two plates and a threshold Td1, if the threshold Td1 is the minimum, simplifying the method, otherwise, adjusting the position of the plate seam lines to align the plate seam lines with the adjacent theoretical lines corresponding to the smaller value of 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 of PT1 and PT 2;
and S33, judging the relation between the minimum distances SL1 and SL2 from the board seams to the boundaries of the two boards and a threshold Td2 for the residual board seams which are not horizontally connected, and if the minimum distances SL1 and SL2 are less than the threshold Td2, carrying out isolation treatment on the boards between the board seams and the corresponding boundaries.
Preferably, S70 is further included, and the preprocessed simplified model of the ship is checked by manual inspection or by a third-party tool and then saved.
The invention has the beneficial effects that:
the invention firstly realizes the classification of the ship body plate seams by classifying and identifying the common elements of the ship body plate seams, and then automatically simplifies and processes various ship body plate seams by a simplifying method of summarizing and summarizing, thereby reducing the workload of designers, improving the efficiency and reliability of design analysis work and shortening the design period.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
fig. 2 shows three types of hull plate seams in the embodiment of the invention.
The reference numbers in the figures illustrate:
10-plate suture; 11-a first sheet material; 12-a second sheet material;
20-adjacent theoretical line; 21-reinforcing ribs; 22-support plate.
Detailed Description
The following describes 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 limit the present invention.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" 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 otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
The embodiment, as shown in fig. 1 and fig. 2, discloses a plate seam pretreatment method suitable for finite element analysis of a ship structure, which is used for automatic pretreatment of ship hull plate seams to improve working efficiency and ensure plate seam pretreatment quality. The pretreatment method comprises the following steps:
s10: and acquiring common elements of the ship body plate seams to be pretreated, 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 plate seam of a ship body; acquiring a plate thickness parameter PT of two plates connected with a ship body plate seam; obtaining an angle parameter AG of two plates connected with a ship body plate seam; acquiring a length parameter SL from a ship body plate seam to a plate boundary; the length parameter ST of the hull plate seams to the adjacent theoretical line 20 is obtained.
S12, acquisition of panel seam 10: the plate stitches 10 are a two-dimensional geometric representation of the hull plate seams, each plate stitch 10 being extracted according to a three-dimensional model of the two plates to which the corresponding hull plate seam is connected.
S13, obtaining adjacent theoretical line 20: the adjacent theoretical line 20 is a two-dimensional trajectory line of the trend of the reinforcing ribs 21 and the supporting plates 22 in the two plates connected by the ship body plate seam, and the adjacent theoretical line 20 closest to the plate seam line 10 on the two plates is obtained.
S14, classification of ship plate seams: as shown in fig. 2, based on the spatial position relationship AG and the plate thickness PT of two plates connected by a ship plate seam, the ship plate seam to be pretreated is divided into three types, namely a horizontally connected plate seam with the same plate thickness, a horizontally connected plate seam with different plate thicknesses and a residual plate seam which is not horizontally connected;
s20: and constructing a universal data structure of the ship plate seam according to the acquired common elements of the ship plate seam.
Specifically, S20 includes:
s21: common elements included in the generic data structure include: the name PN1 of the first plate 11 in the two plates connected by the ship body plate seam; the name PN2 of the second plate 12 in the two plates connected by the ship body plate seam; the thickness PT1 of the first plate 11 in the two plates connected by the ship body plate seam; the thickness PT2 of the second plate 12 in the two plates connected by the ship body plate seam; an included angle AG between two plates connected by a ship body plate seam; the minimum distance SL1 from the panel seam line 10 to the first panel 11 boundary; the minimum distance SL2 from the panel seam line 10 to the boundary of the second panel 12; the distance ST1 of the panel seam line 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 seam 10 parameters including: the spatial coordinate values SCV1 and SCV2 of the start and end points of the board stitch line 10;
the generic data structure contains the parameters of the adjacent theoretical line 20 including: spatial coordinate values OCV1 and OCV2 of the starting point and the ending point of the first plate material 11 adjacent to the theoretical line 20; the spatial coordinate values TCV1 and TCV2 of the starting and ending points of the second sheet material 12 adjacent the theoretical line 20;
s22, defining the data types of the common elements, the board seam lines 10 and the adjacent theoretical lines 20 under the general data structure;
wherein the names of the common elements, the plate stitch lines 10, and the adjacent theoretical lines 20 are character string type; the name of the first plate 11 and the second plate 12 connected with the ship body plate seam is a character string type; the thickness of the first plate 11 and the second plate 12 connected with the ship body plate seam is real number type; the included angle between the first plate 11 and the second plate 12 connected with the ship body plate seam is real; the minimum distance from the plate sewing line 10 to the boundary of the first plate 11 and the second plate 12 is real; the distance of the plate sewing line 10 to the adjacent theoretical line 20 of the first plate 11 and the second plate 12 is real number type; the spatial coordinate values of the starting point and the ending point of the plate seam line 10 are real number type; the spatial coordinate values of the starting point and the ending point of the first plate material 11 and the second plate material 12 adjacent to the theoretical line 20 are real type.
S30: establishing pretreatment rules and simplifying methods of various ship body plate seams.
Specifically, S30 includes:
s31, judging the size relation between ST1, ST2 and a threshold Td1 for ship board seams which are horizontally connected and have the same board thickness; if the threshold Td1 is minimal then no simplification is required, otherwise the plate stitch 10 position is adjusted to align the plate stitch 10 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 Td1 for ship board seams which are horizontally connected and have different board thicknesses; if the threshold Td1 is minimal then no simplification is required, otherwise the panel seam line 10 position is adjusted to align the panel seam line 10 with the adjacent theoretical line 20 corresponding to the lesser of ST1 and ST2, while comparing the sizes of PT1 and PT2 and replacing the thickness of the panel between the two adjacent theoretical lines 20 of the first panel 11 and the second panel 12 with the lesser of PT1 and PT 2.
S33, judging the size relation between SL1, SL2 and a threshold Td2 for the remained board seams which are not horizontally connected; if the value is less than the threshold Td2, isolating the plate between the plate seam lines 10 and the corresponding boundaries so as to ignore the plate seam lines when subsequently gridding is divided, namely, not carrying out gridding on the remained plate seam lines when carrying out finite element analysis; if the value is larger than or equal to the threshold Td2, simplification is not needed, that is, in the finite element analysis, the remaining plate seams are directly gridded.
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: establishing a data model for the ship plate seam by taking the ship plate seam information in the ship three-dimensional CAD model as an index;
s42, searching two plates connected with a ship body plate seam from the ship three-dimensional CAD model, and obtaining the name PN and the thickness PT of the two plates;
s43, acquiring an included angle AG of two boards, acquiring boundaries of the two boards, calculating a starting point SCV1 and an end point SCV2 of a board seam line 10, calculating a minimum distance SL from the board seam line 10 to the boundaries of the boards, acquiring structures of a reinforcing rib 11 and a supporting plate 12 which are parallel to the board seam line 10 in the two boards, respectively determining an adjacent theoretical line 20 of the two boards and extracting starting points OCV1, TCV1, end points OCV2 and TCV2 of the two boards;
and S44, finishing assignment of the data model of the ship plate seam by using the data obtained in S42 and S43.
S50: and screening the ship body plate seams needing to be preprocessed according to the parameters of the data model of the ship body plate seams.
Specifically, S50 includes:
s51: acquiring an included angle AG of two plates connected with a ship body plate seam according to a data model of the ship body plate seam;
s52, judging the value of the included angle AG;
s53, if AG is equal to 0 degree, storing the ship board seam into the board seam set to be preprocessed;
and S54, if AG is not equal to 0 degrees, and at least one of the minimum distances SL1 and SL2 from the board seam line 10 to the boundaries of the two boards is smaller than a threshold value Td2, storing the ship board seams into a board seam set to be pretreated.
S60: and simplifying the screened ship body plate seams by selecting a simplifying method matched with the ship body plate seams.
Specifically, S60 includes:
s61, intensively extracting hull plate seams from the plate seams to be pretreated, and determining the types of the hull plate seams according to the thicknesses of two plates corresponding to the hull plate seams and the included angle between the two plates;
and S62, selecting the simplifying method established in the S30 according to the type of the ship board seam to simplify the ship board seam.
Wherein:
when the ship hull plate seams are horizontally connected and have the same plate thickness, judging the size relation between the distances ST1 and ST2 from the plate seam line 10 to the adjacent theoretical line 20 of the two plates and a threshold Td 1; if the threshold Td1 is minimal, then simplification is not required; otherwise, the position of the plate stitch line 10 is adjusted to align the plate stitch line 10 with the adjacent theoretical line 20 corresponding to the smaller value of the ST1 and ST 2;
when the ship hull plate seams are horizontally connected and have different plate thicknesses, judging the size relation between the distances ST1 and ST2 from the plate seam line 10 to the adjacent theoretical line 20 of the two plates and the threshold Td 1; if the threshold Td1 is minimal, then simplification is not required; otherwise, adjusting the position of the plate seam line 10, aligning the plate seam line 10 with the adjacent theoretical line 20 corresponding to the smaller value of the 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 of PT1 and PT 2;
when the ship hull plate seam is a residual plate seam which is not horizontally connected, judging the size relation between the minimum distances SL1 and SL2 from the plate seam line 10 to the boundary of two plates and a threshold value Td 2; if the value is less than the threshold value Td2, the board between the board seam line 10 and the corresponding boundary is isolated so as to be ignored when the grid is divided subsequently; if the value is equal to or greater than the threshold Td2, simplification is not required.
And S70, checking the preprocessed ship simplified model by adopting manual checking or a third-party tool, and then saving the ship simplified model for subsequent finite element meshing.
Compared with the prior art, the application has at least the following technical effects:
according to the ship body plate seam automatic simplification method, the common elements of the ship body plate seams needing to be preprocessed are sorted, the universal data structure describing the ship body plate seams is constructed, the ship body plate seam preprocessing rules and the simplification method are established, a data model is established for each ship body plate seam, the ship body plate seams needing to be preprocessed are screened out, the corresponding preprocessing method is automatically selected, the ship body plate seams are simplified, automatic simplification of the ship body plate seams is achieved, the ship CAD simplified model meeting the finite element grid division requirement is obtained, when ship structure strength is verified, the ship CAD simplified model after preprocessing can be used for carrying out finite element grid division, the ship finite element model is rapidly generated, repeated modeling in the middle process is reduced, design efficiency and design accuracy are improved, and the design period is shortened.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. A plate seam pretreatment method suitable for finite element analysis of ship structures is characterized by comprising 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 hull plate seams needing to be preprocessed according to parameters of the data model of the hull plate seams;
s60: and simplifying the screened ship body plate seams by selecting a simplifying method matched with the ship body plate seams.
2. The method for preprocessing the plate gap suitable for the finite element analysis of the ship structure as claimed in claim 1, wherein the S40 comprises:
s41: establishing a data model for the ship plate seam by taking the ship plate seam information in the ship three-dimensional CAD model as an index;
s42, searching two plates connected with a ship body plate seam from the ship three-dimensional CAD model, and obtaining the name PN and the thickness PT of the two plates;
s43, obtaining an included angle AG of two boards, obtaining the boundary of the two boards, calculating a starting point SCV1 and an end point SCV2 of a board seam line (10), calculating the minimum distance SL from the board seam line (10) to the boundary of the boards, obtaining the structures of a reinforcing rib (21) and a supporting plate (22) which are parallel to the board seam line (10) in the two boards, respectively determining adjacent theoretical lines (20) of the two boards and extracting starting points OCV1, TCV1 and end points OCV2 and TCV2 of the two boards;
and S44, finishing assignment of the data model of the ship plate seam by using the data obtained in S42 and S43.
3. The method for preprocessing the plate gap suitable for the finite element analysis of the ship structure as claimed in claim 2, wherein the S50 comprises:
s51: acquiring an included angle AG of two plates connected with a ship body plate seam according to a data model of the ship body plate seam;
s52, judging the value of the included angle AG;
s53, if AG is equal to 0 degree, storing the ship body plate seam into a plate seam set to be preprocessed;
and S54, if AG is not equal to 0 degrees, and at least one of the minimum distances SL1 and SL2 from the board seam line (10) to the boundaries of the two boards is less than a threshold value Td2, storing the ship board seam into a board seam set to be pretreated.
4. The method for preprocessing the plate gap suitable for the finite element analysis of the ship structure as claimed in claim 3, wherein the S60 comprises:
s61, intensively extracting ship body plate seams from the plate seams to be pretreated, and determining the types of the ship body plate seams according to the thicknesses PT of the two plates corresponding to the ship body plate seams and the included angle AG between the two plates;
and S62, simplifying the ship body plate seams by adopting a corresponding simplifying method according to the type of the ship body plate seams.
5. The method for preprocessing the plate seam suitable for the finite element analysis of the ship structure as claimed in claim 4, wherein the simplified method in the step S62 comprises the following steps:
when the ship hull plate seams are horizontally connected and have the same plate thickness, judging the size relationship between the distances ST1 and ST2 from the plate seam line (10) to the adjacent theoretical lines (20) of the two plates and a threshold Td 1; if the threshold Td1 is minimal, then simplification is not required; otherwise, adjusting the position of the plate stitch line (10) to align the plate stitch line (10) with the adjacent theoretical line (20) corresponding to the smaller value of ST1 and ST 2;
when the ship hull plate seams are horizontally connected and have different plate thicknesses, judging the size relationship between the distances ST1 and ST2 from the plate seam line (10) to the adjacent theoretical lines (20) of the two plates and a threshold Td 1; if the threshold Td1 is minimal, then simplification is not required; otherwise, adjusting the position of the plate seam line (10), aligning the plate seam line (10) with an adjacent theoretical line (20) corresponding to the smaller value of 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 of PT1 and PT 2;
when the ship hull plate seam is a residual 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 boundary of two plates and a threshold value Td 2; if less than the threshold Td2, the panel seam line (10) is isolated from the panel between the respective boundaries.
6. The slab gap pretreatment method suitable for finite element analysis of ship structures according to claims 1-5, characterized by further comprising:
s10: acquiring common elements of the ship body plate seams to be pretreated, and classifying the ship body plate seams according to the common elements;
s20: constructing a universal data structure of the ship plate seam according to the acquired common elements of the ship plate seam;
s30: and (3) establishing a pretreatment method for various ship body plate seams.
7. The method for preprocessing the plate gap suitable for the finite element analysis of the ship structure as claimed in claim 6, wherein the step S10 comprises:
s11, obtaining common elements: acquiring name parameters PN of two plates connected with a plate seam of a ship body; acquiring a plate thickness parameter PT of two plates connected with a ship body plate seam; obtaining an angle parameter AG of two plates connected with a ship body plate seam; acquiring a length parameter SL from a ship body plate seam to a plate boundary; acquiring a length parameter ST from a ship body plate seam to an adjacent theoretical line;
s12, obtaining of plate suture (10): the plate seam lines (10) are two-dimensional geometric representations of the ship body plate seams, and each plate seam line (10) needs to be extracted according to a three-dimensional model of two plates connected with the corresponding ship body plate seam;
s13, obtaining adjacent theoretical line (20): the adjacent theoretical line (20) is a two-dimensional trajectory line of the trend of the reinforcing ribs (21) and the supporting plates (22) in the two plates connected by the ship body plate seam, and the adjacent theoretical line (20) which is respectively closest to the plate seam line (10) in the two plates is obtained.
S14, classification of ship plate seams: based on the spatial position relation AG and the plate thickness PT of two plates connected by the ship body plate seam, the ship body plate seam needing to be preprocessed 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 remained plate seam which is not horizontally connected.
8. The method for preprocessing the plate gap suitable for the finite element analysis of the ship structure as claimed in claim 6, wherein the step S20 comprises:
s21: common elements included in the generic data structure include: the name PN1 of the first plate (11) in the two plates connected by the ship body plate seam; the name PN2 of the second plate (12) in the two plates connected by the ship body plate seam; the thickness PT1 of the first plate (11) of the two plates connected by the ship body plate seam; the thickness PT2 of the second plate (12) of the two plates connected by the ship body plate seam; an included angle AG between two plates connected by a ship body plate seam; a minimum distance SL1 from the panel seam line (10) to the boundary of the first panel (11); a minimum distance SL2 from the panel seam line (10) to the second panel (12) boundary; a distance ST1 of the panel seam line (10) to an adjacent theoretical line (20) of the first panel (11); a distance ST2 of the panel seam line (10) to an adjacent theoretical line (20) of the second panel (12);
the generic data structure contains plate stitch (10) parameters including: the spatial coordinate values SCV1 and SCV2 of the starting point and the ending point of the plate seam line (10);
the generic data structure contains parameters of adjacent theoretical lines (20) including: spatial coordinate values OCV1 and OCV2 of the starting point and the ending point of the first plate material (11) adjacent to the theoretical line (20); spatial coordinate values TCV1 and TCV2 of a start point and an end point of the second sheet material (12) adjacent to the theoretical line (20);
s22, defining data types of common elements, plate seam lines (10) and adjacent theoretical lines (20) under a general data structure;
wherein the names of the common elements, the plate seam lines (10), and the adjacent theoretical lines (20) are character string type; the name of a first plate (11) and a second plate (12) connected with the ship body plate seam is a character string type; the thickness of a first plate (11) and a second plate (12) connected with the ship body plate seam is real; an included angle between a first plate (11) and a second plate (12) connected with the ship body plate seam is real; the minimum distance from the plate sewing line (20) to the boundary of the first plate material (11) and the second plate material (12) is real number type; the distance from the plate seam line (20) to the adjacent theoretical line (20) of the first plate (11) and the second plate (12) is real number type; the spatial coordinate values of the starting point and the ending point of the plate seam line (20) are real number type; the spatial coordinate values of the starting point and the ending point of the first plate material (11) and the second plate material (12) adjacent to the theoretical line (20) are real.
9. The method for preprocessing the plate gap suitable for the finite element analysis of the ship structure as claimed in claim 6, wherein the step S30 comprises:
s31, for ship hull plate seams which are horizontally connected and have the same plate thickness, judging the size relation between the distances ST1 and ST2 from the plate seam line (10) to the adjacent theoretical lines (20) of the two plates and a threshold value Td1, if the threshold value Td1 is the minimum, simplifying the method, otherwise, adjusting the position of the plate seam line (10) to align the plate seam line (10) with the adjacent theoretical line (20) corresponding to the smaller value of ST1 and ST 2;
s32, for the horizontally connected plate seams with different plate thicknesses, judging the size relationship of the distances ST1 and ST2 from the plate seam line (10) to the adjacent theoretical lines (20) of the two plate materials and a threshold value Td1, if the threshold value Td1 is minimum, simplifying the method, otherwise, adjusting the position of the plate seam line (10), aligning the plate seam line (10) with the adjacent theoretical line (20) corresponding to the smaller value of ST1 and ST2, comparing the sizes of PT1 and PT2, and replacing the thickness of the plate material between the two adjacent theoretical lines (20) of the first plate material (11) and the second plate material (12) with the smaller value of PT1 and PT 2;
and S33, judging the relation between the minimum distances SL1 and SL2 from the board seam line (10) to the boundaries of the two boards and a threshold value Td2 for the remained board seams which are not horizontally connected, and if the minimum distances SL1 and SL2 are smaller than the threshold value Td2, carrying out isolation treatment on the board seam line (20) and the boards between the corresponding boundaries.
10. The slab joint pretreatment method for finite element analysis of ship structures as claimed in any one of claims 7-9, further comprising S70, wherein the pretreated ship simplified model is inspected manually or by a third tool and then stored.
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| CN114987716A (en) * | 2022-06-29 | 2022-09-02 | 中船黄埔文冲船舶有限公司 | Seam arranging method for hull outer plate |
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| DE10326229A1 (en) * | 2003-06-11 | 2004-12-30 | Daimlerchrysler Ag | Method for simulating a joint connection |
| KR101423392B1 (en) * | 2012-10-12 | 2014-07-28 | 경북대학교 산학협력단 | 3D CAD simplification method of equipment and materials of ship outfitting and offshore plants |
| CN106777746B (en) * | 2016-12-28 | 2020-04-07 | 渤海造船厂集团有限公司 | Intelligent generation method for full three-dimensional model welding seam information and flaw detection sheet bitmap |
| CN111444651B (en) * | 2020-03-31 | 2022-11-11 | 北京空天技术研究所 | Intermittent welding seam strength evaluation method |
| CN111783218B (en) * | 2020-05-19 | 2022-08-23 | 中国第一汽车股份有限公司 | Lap weld simulation method |
| CN111967177A (en) * | 2020-09-01 | 2020-11-20 | 中车大同电力机车有限公司 | Method for modeling finite element model of welding seam of welded steel structure |
| CN112199783B (en) * | 2020-10-30 | 2024-01-12 | 安徽江淮汽车集团股份有限公司 | Frame finite element simulation method, device, equipment and storage medium |
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| CN114987716A (en) * | 2022-06-29 | 2022-09-02 | 中船黄埔文冲船舶有限公司 | Seam arranging method for hull outer plate |
| CN114987716B (en) * | 2022-06-29 | 2023-12-22 | 中船黄埔文冲船舶有限公司 | Seam arranging method for hull planking |
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