CN113722824A - Ship plate structure simplification method and device suitable for finite element analysis - Google Patents
Ship plate structure simplification method and device suitable for finite element analysis Download PDFInfo
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Abstract
The invention provides a ship plate structure simplifying method and device suitable for finite element analysis, which comprises the following steps: acquiring plate structure information of a ship based on a three-dimensional model of the ship; based on the plate structure information, applying a preset class division rule to determine the divided plate structure; based on the divided plate structure, applying a preset data structure construction rule to determine the information of a plate structure object; and determining the plate structure to be simplified by applying a preset judgment rule based on the information of the plate structure object. The ship plate structure simplification method and device suitable for finite element analysis are characterized in that classification rules and processing rules of a ship plate structure are preset based on a three-dimensional model of a ship to obtain a simplified plate structure, so that automatic identification of the plate structure to be simplified is realized, and the manual workload of an analyst is reduced; the efficiency and the reliability of design analysis work are improved, and the design period is shortened.
Description
Technical Field
The invention relates to the field of ship design, in particular to a ship plate structure simplifying method and device suitable for finite element analysis.
Background
At present, a method adopted by finite element mesh analysis is to directly generate a finite element analysis model from a three-dimensional design model of a product, the mesh size adopted when finite element mesh analysis is carried out on a ship product is generally between 50 centimeters and several meters, and because the size of a ship is large and the length of the ship is usually between dozens of meters and several hundreds of meters, a large number of triangular or deformed meshes exist, for example, the finite element analysis model is directly generated from the three-dimensional model of the ship, the triangular or deformed meshes cannot meet the specification requirements of finite element calculation, so that the three-dimensional model of the ship needs to be simplified before the finite element mesh analysis of a ship structure, such as secondary components are deleted, structural details are ignored, the geometric structure is adjusted, and the like.
In the prior art, the simplification work is mainly performed by manually determining the geometric structural features to be simplified by an analyst and then simplifying the geometric structural features by using tools such as sketches or solid shapes, and the processing mode usually consumes a lot of time and is difficult to ensure quality.
Therefore, how to efficiently simplify the three-dimensional model of the ship before finite element mesh analysis is performed on the ship product is an urgent problem to be solved.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention provides a ship plate structure simplification method and apparatus suitable for finite element analysis, which is used to solve the problem of low efficiency of simplifying the three-dimensional model of a ship before finite element mesh analysis is performed on a ship product in the prior art.
To achieve the above and other related objects, the present invention provides a ship plate structure simplification method suitable for finite element analysis, comprising the steps of: acquiring plate structure information of a ship based on a three-dimensional model of the ship; based on the plate structure information, applying a preset class division rule to determine the divided plate structure; based on the divided plate structure, applying a preset data structure construction rule to determine the information of a plate structure object; and determining the plate structure to be simplified by applying a preset judgment rule based on the information of the plate structure object.
In an embodiment of the present invention, the board structure information includes: one or more of contour points, contour edges, constraints, and intersecting segments.
In an embodiment of the present invention, the preset classification rule includes: the length of the contour edge is less than a first threshold and the length of the intersecting segment is less than a second threshold, said constraint being one or more of in the interior of the plate structure.
In an embodiment of the present invention, the data structure construction rule includes: constructing a first layer of data nodes based on the name of the plate structure information; constructing a second layer data node to determine information of the plate structure object based on the first layer data node; and the second layer data node is the object content corresponding to the first layer data node.
In an embodiment of the present invention, the determining the plate structure to be simplified by applying a preset determination rule based on the information of the plate structure object includes: extracting the lengths of all contour edges based on the information of the plate structure object; when the length of the contour edge is smaller than a third threshold value, determining the plate structure to be a plate structure to be simplified; when the lengths of all the contour edges are larger than the third threshold value, extracting the lengths of all the intersected sections; when the length of the intersecting section is smaller than a fourth threshold value, determining that the plate structure is the plate structure to be simplified; when the lengths of all the intersected sections are larger than the fourth threshold value, extracting the coordinates of two end points of all the constraints and the position coordinates of all the contour points; judging whether the constraint is in the plate structure or not according to the coordinates of the two end points and the position coordinates; when the constraint is inside the plate structure, determining the plate structure to be the simplified plate structure.
Correspondingly, the invention provides a ship plate structure simplifying device suitable for finite element analysis, which comprises an acquisition module, a data processing module and a data processing module, wherein the acquisition module is used for acquiring plate structure information of a ship based on a three-dimensional model of the ship; the first processing module is used for determining the divided plate structure by applying a preset class division rule based on the plate structure information; the second processing module is used for applying a preset data structure construction rule based on the divided plate structure and determining the information of a plate structure object; and the determining module is used for determining the plate structure to be simplified by applying a preset judgment rule based on the information of the plate structure object.
In an embodiment of the present invention, the board structure information includes: one or more of contour points, contour edges, constraints, and intersecting segments.
In an embodiment of the present invention, the preset classification rule includes: the length of the contour edge is less than a first threshold and the length of the intersecting segment is less than a second threshold, said constraint being one or more of in the interior of the plate structure.
The present invention provides a storage medium having stored thereon a computer program which, when executed by a processor, implements the above ship board structure simplification method suitable for finite element analysis.
The invention provides a ship design platform, which comprises a memory, a control unit and a display unit, wherein the memory is used for storing a computer program; a processor for running said computer program to implement the ship plate structure simplification method suitable for finite element analysis described above.
As described above, the ship plate structure simplification method and apparatus suitable for finite element analysis of the present invention have the following beneficial effects:
(1) based on the three-dimensional model of the ship, the classification rules and the processing rules of the ship plate structure are preset to obtain the simplified plate structure, so that the automatic identification of the plate structure needing to be simplified is realized, and the manual workload of an analyst is reduced.
(2) The efficiency and the reliability of design analysis work are improved, and the design period is shortened.
Drawings
FIG. 1 is a flow chart of a simplified ship plate structure suitable for finite element analysis according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of the ship plate structure information in an embodiment of the ship plate structure simplification method for finite element analysis according to the present invention.
FIG. 3 is a schematic diagram of a simplified ship board structure suitable for finite element analysis according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a ship plate structure simplification device suitable for finite element analysis according to an embodiment of the invention.
FIG. 5 shows a ship design platform for an embodiment of the present invention for a simplified ship plate structure suitable for finite element analysis.
Description of the element reference numerals
41 acquisition module
42 first processing module
43 second processing module
44 determination module
51 processor
52 memory
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
The ship plate structure simplification method and device suitable for finite element analysis are characterized in that classification rules and processing rules of a ship plate structure are preset based on a three-dimensional model of a ship to obtain a simplified plate structure, so that automatic identification of the plate structure to be simplified is realized, and the manual workload of an analyst is reduced; the efficiency and the reliability of design analysis work are improved, and the design period is shortened.
As shown in fig. 1, in the present embodiment, the ship plate structure simplification method suitable for finite element analysis of the invention includes the following steps:
and step S1, acquiring the plate structure information of the ship based on the three-dimensional model of the ship.
Specifically, the plate structure information includes: one or more of contour points, contour edges, constraints, and intersecting segments. Wherein, the contour points refer to the intersection points between the lines forming the plate structure boundary; the contour edge refers to a line forming the boundary of the plate structure; the intersection line of the constraint fingerboard structure and other board structures or profiles; the intersecting segments refer to the contour points and the line segments formed on the contour edges that are constrained. As shown in fig. 2, the schematic diagram of the plate structure information in the embodiment shows 5 different plate structures, which are T1, T2, T3, T4 and T5, respectively, and the plate structure information includes: contour point 21, contour edge 22, constraint 23, and intersecting segment 24, it can be seen that the position of constraint 23 in plate structures T2, T3, T4, and T5 differ.
And step S2, based on the plate structure information, applying a preset classification rule to determine the classified plate structure.
Specifically, the preset classification rule includes: the length of the contour edge is less than a first threshold and the length of the intersecting segment is less than a second threshold, said constraint being one or more of in the interior of the plate structure. Referring to fig. 2, for example, the first threshold is 100 mm, the second threshold is 102 mm, and the length of the upper right contour edge 22 in the plate structure T1 is 30 mm smaller than 100 mm of the first threshold, so that the plate structure T1 is in the divided plate structure; the upper left intersection 24 in the plate structure T2 is 40 mm less than 102 mm of the second threshold in length, and thus the plate structure T2 is in the divided plate structure; the constraint 23 in the panel structure T5 is internal to the panel structure, and thus the panel structure T5 is in the divided panel structure.
And step S3, based on the divided plate structure, applying a preset data structure construction rule to determine the information of the plate structure object.
Specifically, the data structure construction rule includes: constructing a first layer of data nodes based on the name of the plate structure information; constructing a second layer data node to determine information of the plate structure object based on the first layer data node; and the second layer data node is the object content corresponding to the first layer data node.
Further specifically, a first layer of data nodes are built according to the names of the contour points, the contour edges, the constraints and the intersecting sections, then a second layer of data nodes are created on the basis of the first layer of data nodes, namely the next layer of data nodes of the first layer of data nodes corresponding to the contour points are position coordinates of all contour points of the plate structure; the next layer of data nodes of the first layer of data nodes corresponding to the contour edges are the lengths of all the contour edges of the plate structure; the next layer of data nodes of the first layer of data nodes corresponding to the constraints are the position coordinates of two end points of all constraints of the plate structure; the next layer of data nodes of the first layer of data nodes corresponding to the intersecting sections are the lengths of all the intersecting sections of the plate structure and the position coordinates corresponding to the two end points. The first layer data nodes constructed under the general data structure define the names of the outline points, the outline edges, the constraints and the intersecting segments as character string types, and define all the data nodes in the second layer data nodes as real numbers.
After the node types are defined for the first layer data node and the second layer data node, content creation is performed on the second layer data node to determine information of the plate structure object.
Specifically, according to the plate structure information, contour points contained in the plate structure information are sequentially searched from a three-dimensional model of the ship, the position coordinates of each contour point are extracted, and the distance between the contour points is calculated to obtain the length of a contour edge; searching other plate structures, reinforcing ribs and the like associated with each plate structure, and extracting the position coordinates of two end points of the intersection line of the corresponding constraints; and obtaining the position coordinates of two end points corresponding to the intersecting segments by using the constraint and the contour points, and calculating the length of the intersecting segments to determine the information of the plate structure object.
And step S4, based on the information of the plate structure object, applying a preset judgment rule to determine the plate structure to be simplified.
Specifically, the determining the plate structure to be simplified by applying a preset judgment rule based on the information of the plate structure object includes: extracting the lengths of all contour edges based on the information of the plate structure object; when the length of the contour edge is smaller than a third threshold value, determining the plate structure to be a plate structure to be simplified; when the lengths of all the contour edges are larger than the third threshold value, extracting the lengths of all the intersected sections; when the length of the intersecting section is smaller than a fourth threshold value, determining that the plate structure is the plate structure to be simplified; when the lengths of all the intersected sections are larger than the fourth threshold value, extracting the coordinates of two end points of all the constraints and the position coordinates of all the contour points; judging whether the constraint is in the plate structure or not according to the coordinates of the two end points and the position coordinates; when the constraint is inside the plate structure, determining the plate structure to be the simplified plate structure. After the coordinates of the two end points of the constraint and the position coordinates of the contour points are extracted, whether the constraint is in the plate structure or not is judged according to the relative positions of the two end points and the position coordinates of the contour points so as to determine whether the plate structure is the plate structure needing to be simplified or not. As shown in FIG. 3, the structure of the plate in this embodiment is shown.
After the screening of the judgment condition, if the information of the plate structure object does not accord with the condition, the plate structure is determined not to be the plate structure needing to be simplified.
Further specifically, after the plate structure to be simplified is determined, the correctness of the plate structure to be simplified can be further checked by adopting a manual inspection or a third-party tool, and whether the screened plate structures all need to be simplified is judged so as to check the correctness of the method disclosed by the invention.
Specifically, when it is checked that the board structure is not a board structure that needs to be simplified, the cause of the error is determined first, and then further processing is performed, specifically, when it is determined that the error is caused by abnormal operation of a computer or a software program, the step returns to step S4, and the board structure is identified again; when it is determined that the error is caused by insufficient consideration of the board structure class, the process returns to step S2, a new board structure class division is supplemented, and recognition is performed again.
After the steps are processed, the obtained correct plate structure needing to be simplified is stored for subsequent specific structural feature simplification processing. As shown in FIG. 3, the structure diagram of the plate in this embodiment is an overall flowchart of the above steps.
As shown in fig. 4, in the present embodiment, the ship plate structure simplification apparatus suitable for finite element analysis of the invention includes:
an obtaining module 41, configured to obtain plate structure information of a ship based on a three-dimensional model of the ship;
a first processing module 42, configured to apply a preset category division rule based on the plate structure information, and determine a divided plate structure;
a second processing module 43, configured to apply a preset data structure construction rule based on the divided plate structure, and determine information of a plate structure object;
and the determining module 44 is configured to determine a plate structure to be simplified by applying a preset judgment rule based on the information of the plate structure object.
The storage medium of the present invention stores thereon a computer program that, when executed by a processor, implements the above-described three-dimensional model-based ship building project management and control method.
As shown in fig. 5, in the embodiment, the ship design platform of the present invention includes: a processor 51 and a memory 52.
The memory 52 is used for storing computer programs.
The memory 52 includes: various media that can store program codes, such as ROM, RAM, magnetic disk, U-disk, memory card, or optical disk.
The processor 51 is connected to the memory 52 and configured to execute the computer program stored in the memory 52, so that the engineering management and control platform executes the above-mentioned three-dimensional model-based ship building engineering management and control method.
Preferably, the Processor 51 may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; the Integrated Circuit may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, or a discrete hardware component.
In summary, the ship plate structure simplification method and device suitable for finite element analysis of the present invention preset classification rules and processing rules of a ship plate structure based on a three-dimensional model of a ship to obtain a simplified plate structure, thereby realizing automatic identification of the plate structure to be simplified and reducing the manual workload of an analyst; the efficiency and the reliability of design analysis work are improved, and the design period is shortened. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A method for simplifying ship plate structure suitable for finite element analysis, characterized in that the method comprises the following steps:
acquiring plate structure information of a ship based on a three-dimensional model of the ship;
based on the plate structure information, applying a preset class division rule to determine the divided plate structure;
based on the divided plate structure, applying a preset data structure construction rule to determine the information of a plate structure object; and determining the plate structure to be simplified by applying a preset judgment rule based on the information of the plate structure object.
2. The method of claim 1, wherein the plate structure information comprises: one or more of contour points, contour edges, constraints, and intersecting segments.
3. The method of claim 2, wherein the preset classification rule comprises: the length of the contour edge is less than a first threshold and the length of the intersecting segment is less than a second threshold, said constraint being one or more of in the interior of the plate structure.
4. The method of claim 2, wherein the data structure construction rule comprises:
constructing a first layer of data nodes based on the name of the plate structure information;
constructing a second layer data node to determine information of the plate structure object based on the first layer data node; and the second layer data node is the object content corresponding to the first layer data node.
5. The method of claim 2, wherein the determining the plate structure to be simplified by applying a predetermined judgment rule based on the information of the plate structure object comprises:
extracting the lengths of all contour edges based on the information of the plate structure object;
when the length of the contour edge is smaller than a third threshold value, determining the plate structure to be a plate structure to be simplified;
when the lengths of all the contour edges are larger than the third threshold value, extracting the lengths of all the intersected sections;
when the length of the intersecting section is smaller than a fourth threshold value, determining that the plate structure is the plate structure to be simplified;
when the lengths of all the intersected sections are larger than the fourth threshold value, extracting the coordinates of two end points of all the constraints and the position coordinates of all the contour points;
judging whether the constraint is in the plate structure or not according to the coordinates of the two end points and the position coordinates; when the constraint is inside the plate structure, determining the plate structure to be the simplified plate structure.
6. A ship plate structure simplification device suitable for finite element analysis, comprising:
the acquisition module is used for acquiring plate structure information of the ship based on the three-dimensional model of the ship;
the first processing module is used for determining the divided plate structure by applying a preset class division rule based on the plate structure information;
the second processing module is used for applying a preset data structure construction rule based on the divided plate structure and determining the information of a plate structure object;
and the determining module is used for determining the plate structure to be simplified by applying a preset judgment rule based on the information of the plate structure object.
7. The apparatus of claim 6, wherein the plate structure information comprises: one or more of contour points, contour edges, constraints, and intersecting segments.
8. The apparatus of claim 7, comprising: the preset classification rule comprises the following steps: the length of the contour edge is less than a first threshold and the length of the intersecting segment is less than a second threshold, said constraint being one or more of in the interior of the plate structure.
9. A storage medium storing program instructions, wherein the program instructions when executed implement the steps of the ship plate structure simplification method for finite element analysis of any one of claims 1 to 5.
10. A vessel design platform, characterized by: comprising a memory for storing a computer program; a processor for running said computer program to implement the steps of the ship plate structure simplification method for finite element analysis as claimed in any one of claims 1 to 5.
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