CN113722824B - 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 simplification method and device suitable for finite element analysis, comprising the following steps: acquiring the plate structure information of the ship based on the three-dimensional model of the ship; based on the plate structure information, applying a preset category division rule to determine a divided plate structure; based on the divided plate structures, applying preset data structure construction rules to determine information of plate structure objects; and based on the information of the plate structure object, applying a preset judging rule to determine the plate structure to be simplified. According to the method and the device for simplifying the ship plate structure, which are suitable for finite element analysis, based on the three-dimensional model of the ship, the classification rule and the processing rule of the ship plate structure are preset to obtain the simplified plate structure, so that the 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 simplification method and device suitable for finite element analysis.
Background
At present, the method adopted by finite element grid 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 grid analysis is carried out on ship products is generally between 50 cm and several meters, because the ship is large in size and the length is usually between tens of meters and hundreds of meters, a large number of triangular or deformed grids exist, such as the three-dimensional model of the ship is directly generated into the finite element analysis model, and the triangular or deformed grids cannot meet the specification requirements of finite element calculation, so that the three-dimensional model of the ship needs to be simplified before the ship structure finite element grid analysis is carried out, such as secondary components are deleted, structural details are ignored, geometric structures are adjusted, and the like.
In the prior art, the simplification work is mainly to manually determine the geometric structure features to be simplified by an analyst, and then simplify the geometric structure features by means of tools such as sketch or solid modeling, etc., and the processing mode usually consumes a great deal of time and the quality is difficult to ensure.
Therefore, how to efficiently simplify the three-dimensional model of a ship before finite element grid analysis of the ship products is a problem to be solved.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a method and apparatus for simplifying a structure of a ship plate suitable for finite element analysis, which are used for solving the problem of low efficiency of simplifying a three-dimensional model of a ship before finite element grid analysis is performed on a ship product in the prior art.
To achieve the above and other related objects, the present invention provides a simplified method of a ship plate structure suitable for finite element analysis, comprising the steps of: acquiring the plate structure information of the ship based on the three-dimensional model of the ship; based on the plate structure information, applying a preset category division rule to determine a divided plate structure; based on the divided plate structures, applying preset data structure construction rules to determine information of plate structure objects; and based on the information of the plate structure object, applying a preset judging rule to determine the plate structure to be simplified.
In an embodiment of the present invention, the plate structure information includes: one or more of contour points, contour edges, constraints, and intersecting segments.
In an embodiment of the present invention, the predetermined classification rule includes: the length of the profile edge is less than a first threshold and the length of the intersecting segment is less than a second threshold, the constraint being one or more of the interior of the plate structure.
In one embodiment of the present invention, the data structure construction rule includes: constructing a first layer data node based on the name of the plate structure information; constructing a second layer data node based on the first layer data node to determine information of the plate structure object; 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 structure to be simplified based on the information of the structure object by applying a preset judgment rule includes: extracting the lengths of all contour edges based on the information of the plate structure object; when the length of the profile edge is smaller than a third threshold value, determining the plate structure as the plate structure to be simplified; extracting the lengths of all the intersecting sections when the lengths of all the contour edges are larger than the third threshold value; when the length of the intersecting section is smaller than a fourth threshold value, determining the plate structure as the plate structure to be simplified; when the lengths of all the intersecting sections are larger than the fourth threshold value, extracting two end point coordinates of all the constraints and position coordinates of all the contour points; judging whether the constraint is inside the plate structure or not according to the coordinates of the two endpoints and the position coordinates; and determining the plate structure as the plate structure to be simplified when the constraint is inside the plate structure.
Correspondingly, the invention provides a ship plate structure simplifying device suitable for finite element analysis, which comprises an acquisition module, a control module and a control 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 applying a preset category division rule based on the plate structure information to determine a divided plate structure; the second processing module is used for determining information of the plate structure object by applying a preset data structure construction rule based on the divided plate structure; and the determining module is used for applying a preset judging rule based on the information of the plate structure object to determine the plate structure to be simplified.
In an embodiment of the present invention, the plate structure information includes: one or more of contour points, contour edges, constraints, and intersecting segments.
In an embodiment of the present invention, the predetermined classification rule includes: the length of the profile edge is less than a first threshold and the length of the intersecting segment is less than a second threshold, the constraint being one or more of 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-described method of simplifying the structure of a marine vessel plate suitable for finite element analysis.
The invention provides a ship design platform, which comprises a memory, a control unit and a control unit, wherein the memory is used for storing a computer program; and the processor is used for running the computer program to realize the ship plate structure simplification method suitable for finite element analysis.
As described above, the ship plate structure simplification method and device suitable for finite element analysis have the following beneficial effects:
(1) Based on the three-dimensional model of the ship, the classification rule and the processing rule of the ship plate structure are preset to obtain a simplified plate structure, so that the automatic identification of the plate structure 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 illustrating a simplified method of a ship plate structure suitable for finite element analysis according to an embodiment of the present invention.
Fig. 2 is a schematic diagram showing structural information of a simplified method for analyzing a ship plate structure according to the present invention.
FIG. 3 is a schematic diagram of a simplified method of the present invention for finite element analysis of a ship plate structure in one embodiment.
Fig. 4 shows a schematic structural view of a simplified device for finite element analysis of ship plate structure according to an embodiment of the present invention.
Fig. 5 shows a ship design platform according to an embodiment of the present invention for a simplified implementation of a ship plate structure suitable for finite element analysis.
Description of element reference numerals
41. Acquisition module
42. First processing module
43. Second processing module
44. Determination module
51. Processor and method for controlling the same
52. Memory device
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
According to the method and the device for simplifying the ship plate structure, which are suitable for finite element analysis, based on the three-dimensional model of the ship, the classification rule and the processing rule of the ship plate structure are preset to obtain the simplified plate structure, so that the 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 present invention includes the following steps:
and 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 boundary of the plate structure; contour edge refers to the line forming the boundary of the plate structure; restricting the intersection line of the fingerboard structure with other plate structures or profiles; the intersecting segment refers to a contour point and a line segment formed on the contour edge by constraint. As shown in fig. 2, in the schematic diagram of the plate structure information in this embodiment, there are 5 different plate structures, respectively T1, T2, T3, T4, and T5, where the plate structure information includes: the contour point 21, contour edge 22, constraint 23 and intersection 24, it can be seen that the position of constraint 23 in plate structures T2, T3, T4 and T5 are each different.
And S2, based on the plate structure information, applying a preset category division rule to determine the divided plate structure.
Specifically, the preset category classification rule includes: the length of the profile edge is less than a first threshold and the length of the intersecting segment is less than a second threshold, the constraint being one or more of 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 board structure T1 is 30 mm and less than 100 mm of the first threshold, so that the board structure T1 is in the divided board structure; the upper left intersection 24 in the plate structure T2 has a length of 40 mm less than 102 mm of the second threshold, and therefore, the plate structure T2 is in the divided plate structure; the constraint 23 in the plate structure T5 is inside the plate structure, so the plate structure T5 is in the divided plate structure.
And step S3, based on the divided plate structures, applying preset data structure construction rules to determine information of plate structure objects.
Specifically, the data structure construction rule includes: constructing a first layer data node based on the name of the plate structure information; constructing a second layer data node based on the first layer data node to determine information of the plate structure object; 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, and then a second layer of data nodes are built 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 the position coordinates of all contour points of the plate structure; the next layer data node of the first layer data node corresponding to the contour edge is the length of all contour edges of the plate structure; the next layer data node of the first layer data node corresponding to the constraint is the position coordinates of two endpoints of all the constraints of the plate structure; the next layer data node of the first layer data node corresponding to the intersecting segment is the length of all the intersecting segments of the plate structure and the position coordinates corresponding to the two endpoints. The first layer data node constructed under the general data structure is characterized in that the names of contour points, contour edges, constraints and intersecting sections are defined as character string types, and all data nodes in the second layer data node are defined as real types.
After defining the node types for the first layer data node and the second layer data node, content creation is performed for the second layer data node to determine the 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, position coordinates of all the contour points 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 position coordinates of two endpoints of the intersecting line of the corresponding constraint; and obtaining position coordinates of two end points of the corresponding intersecting section by using the constraint and the contour point, and calculating the length of the intersecting section to determine the information of the plate structure object.
And S4, based on the information of the plate structure object, applying a preset judging rule to determine the plate structure to be simplified.
Specifically, the determining the plate structure to be simplified based on the information of the plate structure object by applying a preset judgment rule includes: extracting the lengths of all contour edges based on the information of the plate structure object; when the length of the profile edge is smaller than a third threshold value, determining the plate structure as the plate structure to be simplified; extracting the lengths of all the intersecting sections when the lengths of all the contour edges are larger than the third threshold value; when the length of the intersecting section is smaller than a fourth threshold value, determining the plate structure as the plate structure to be simplified; when the lengths of all the intersecting sections are larger than the fourth threshold value, extracting two end point coordinates of all the constraints and position coordinates of all the contour points; judging whether the constraint is inside the plate structure or not according to the coordinates of the two endpoints and the position coordinates; and determining the plate structure as the plate structure to be simplified when the constraint is inside the plate structure. After extracting the coordinates of two end points of the constraint and the position coordinates of the contour points, judging whether the constraint is inside the plate structure according to the relative positions of the two end points and the contour points so as to determine whether the plate structure is the plate structure to be simplified. As shown in fig. 3, the plate structure in the present embodiment is patterned.
After the above-mentioned judgment condition is screened, if the information of plate structure object does not meet the above-mentioned condition, it is determined that the plate structure is not a plate structure 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 check or by means of a third-party tool, and whether the plate structures obtained by screening all need to be simplified is judged so as to check the correctness of the method.
Specifically, when the board structure is not the board structure to be simplified, judging the cause of the error first, and then further processing, specifically, when judging that the error is caused by abnormal operation of the computer or the software program, returning to the step S4, and re-identifying the board structure; when it is judged that the error is caused by insufficient consideration of the plate structure type, the step S2 is returned to, the new plate structure type division is supplemented, and the recognition is carried out again.
After the steps are processed, the obtained correct plate structure to be simplified is stored for the subsequent specific structure feature simplification processing. As shown in fig. 3, the plate structure in the present embodiment is patterned as an overall flowchart of the above steps.
As shown in fig. 4, in the present embodiment, the ship plate structure simplifying apparatus suitable for finite element analysis of the present invention includes:
an acquisition module 41, configured to acquire 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 classification rule based on the plate structure information, and determine a classified plate structure;
a second processing module 43, configured to determine information of a plate structure object by applying a preset data structure construction rule based on the divided plate structure;
the determining module 44 is configured to apply a preset judging rule based on the information of the plate structure object, and determine a plate structure to be simplified.
The storage medium of the invention stores a computer program which, when executed by a processor, implements the above-described three-dimensional model-based ship construction engineering management and control method.
As shown in fig. 5, in the present embodiment, the ship design platform of the present invention includes: a processor 51 and a memory 52.
The memory 52 is used for storing a computer program.
The memory 52 includes: various media capable of storing 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 is configured to execute a computer program stored in the memory 52, so that the engineering management platform performs the above-mentioned engineering management method for ship construction based on the three-dimensional model.
Preferably, the processor 51 may be a general-purpose processor, including a central processing unit (Central Processing Unit, abbreviated as CPU), a network processor (Network Processor, abbreviated as NP), etc.; but also digital signal processors (Digital Signal Processing, DSP for short), application specific integrated circuits (Application Specific Integrated Circuit, ASIC for short), field-programmable gate arrays (Field-Programmable Gate Array, FPGA for short) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.
In summary, the method and the device for simplifying the ship plate structure, which are suitable for finite element analysis, preset classification rules and processing rules of the ship plate structure based on the three-dimensional model of the ship to obtain the simplified plate structure, thereby realizing automatic identification of the simplified plate structure and reducing the manual workload of analysts; 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 above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (5)
1. A method of simplifying the structure of a ship board suitable for finite element analysis, said method comprising the steps of:
based on the three-dimensional model of the ship, acquiring plate structure information of the ship, wherein the plate structure information comprises: contour points, contour edges, constraints and intersecting sections, wherein the constraints are intersecting lines of the plate structure and other plate structures or sectional materials;
based on the plate structure information, applying a preset category division rule to determine a divided plate structure;
based on the divided plate structures, applying preset data structure construction rules to determine information of plate structure objects, wherein the data structure construction rules comprise: constructing a first layer data node based on the name of the plate structure information, wherein the first layer data node is constructed according to the names of the contour points, the contour edges, the constraints and the intersecting sections; constructing a second layer data node based on the first layer data node to determine information of the plate structure object; the second layer data node is object content corresponding to the first layer data node, and specifically includes: the next layer data node of the first layer data node corresponding to the contour point is the position coordinates of all contour points of the plate structure; the next layer data node of the first layer data node corresponding to the contour edge is the length of all contour edges of the plate structure; the next layer data node corresponding to the constrained first layer data node is the position coordinates of two endpoints of all constraints of the plate structure; the next layer data node of the first layer data node corresponding to the intersecting section is the length of all the intersecting sections of the plate structure and the position coordinates corresponding to the two endpoints;
based on the information of the plate structure object, a preset judging rule is applied to determine the plate structure to be simplified, and the method specifically comprises the following steps: extracting the lengths of all contour edges based on the information of the plate structure object; when the length of the profile edge is smaller than a third threshold value, determining the plate structure as the plate structure to be simplified; extracting the lengths of all the intersecting sections when the lengths of all the contour edges are larger than the third threshold value; when the length of the intersecting section is smaller than a fourth threshold value, determining the plate structure as the plate structure to be simplified; when the lengths of all the intersecting sections are larger than the fourth threshold value, extracting two end point coordinates of all the constraints and position coordinates of all the contour points; judging whether the constraint is inside the plate structure or not according to the coordinates of the two endpoints and the position coordinates; and determining the plate structure as the plate structure to be simplified when the constraint is inside the plate structure.
2. The ship plate structure simplification method suitable for finite element analysis according to claim 1, wherein the preset classification rule includes: the length of the profile edge is less than a first threshold value and the length of the intersecting segment is less than a second threshold value, the constraint being internal to the plate structure.
3. A ship plate structure simplification device suitable for finite element analysis, characterized in that it is adapted to perform the steps of the ship plate structure simplification method suitable for finite element analysis according to claim 1, comprising:
the acquisition module is used for acquiring the plate structure information of the ship based on the three-dimensional model of the ship;
the first processing module is used for applying a preset category division rule based on the plate structure information to determine a divided plate structure;
the second processing module is used for determining information of the plate structure object by applying a preset data structure construction rule based on the divided plate structure;
and the determining module is used for applying a preset judging rule based on the information of the plate structure object to determine the plate structure to be simplified.
4. A storage medium storing program instructions which when executed perform the steps of the ship plate structure simplification method suitable for finite element analysis of any one of claims 1 to 2.
5. A ship design platform, characterized in that: comprising a memory for storing a computer program; a processor for running the computer program to implement the steps of the ship plate structure simplification method suitable for finite element analysis as claimed in any one of claims 1 to 2.
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| 基于规则与模糊判定的模型快速简化方法;戴野;赖一楠;张元;任胜乐;王健;;哈尔滨理工大学学报(04);全文 * |
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