A method for adjusting the unit direction of ring reinforcement finite element refined mesh model

Abstract

The present application belongs to the technical field of direction adjustment of ring reinforcement finite element refined mesh model unit, and specifically relates to a ring reinforcement finite element refined mesh model unit direction adjustment method, which is designed to extract the first layer inner circle nodes, judge the direction of the first layer units and adjust the direction of the first layer inner circle units, and simultaneously extract the second layer inner circle nodes, adjust the direction of the second layer units until all units are adjusted, thereby achieving the direction adjustment of the ring reinforcement finite element refined mesh model unit. The method can be implemented in a programming manner, and can efficiently achieve accurate adjustment of the direction of the ring reinforcement finite element refined mesh model unit with a large number of units.

Description

Technical Field

[0001] The present application belongs to the technical field of unit direction adjustment of a finite element refined mesh model of a ring reinforcement, and specifically relates to a unit direction adjustment method of a finite element refined mesh model of a ring reinforcement. Background Art

[0002] Unifying the unit directions in the finite element model can facilitate the subsequent description and analysis of stress.

[0003] The coarse mesh model of the ring reinforcement finite element has only one layer along the height of the ring reinforcement. The nodes and elements are numbered according to the modeling regulations. The direction of the ring reinforcement element has been considered at the beginning of the model mesh division.

[0004] However, the finite element refined mesh model of the ring reinforcement has multiple layers of units along the height direction of the ring reinforcement. It is difficult to determine the numbering of all nodes and units during modeling. The directions of a large number of ring reinforcement units automatically divided by the finite element software cannot meet expectations. The current finite element software can adjust the unit direction in a single step, requiring the user to select the units that do not meet the unit direction requirements, determine the form and number of direction adjustments, and manually adjust them. For refined mesh models with a large number of units, it is impossible to ensure that each adjustment is accurate, and the operation is cumbersome, inefficient, and has a long cycle.

[0005] This application is proposed in view of the above-mentioned technical defects.

[0006] It should be noted that the disclosure of the above background technology content is only used to assist in understanding the inventive concept and technical solution of the present invention, and it does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above content has been disclosed on the filing date of this application, the above background technology should not be used to evaluate the novelty and creativity of this application. Summary of the Invention

[0007] The purpose of this application is to provide a method for adjusting the unit direction of a ring reinforcement finite element refined grid model to overcome or alleviate at least one of the known technical defects.

[0008] The technical solution of this application is:

[0009] A method for adjusting the unit direction of a ring reinforcement finite element refined mesh model comprises:

[0010] Input the original file of the ring reinforcement finite element refined mesh model [1] into the ring reinforcement node array [3];

[0011] Assign initial values to the first layer inner circle nodes in the inner circle node array [5] using the ring reinforcement node array [3];

[0012] Read the original file of the finite element refined mesh model with ring reinforcement [1], and input the quadrilateral elements therein into the quadrilateral element array [6], including the quadrilateral element number, quadrilateral element attribute number, quadrilateral element node 1, quadrilateral element node 2, quadrilateral element node 3, quadrilateral element node 4, and quadrilateral element judgment mark;

[0013] If the quadrilateral unit node 1 and the quadrilateral unit node 2 are the first-layer inner circle nodes, the node number sequence is adjusted counterclockwise twice, and the quadrilateral unit node 3 and the quadrilateral unit node 4 are used to assign values to the second-layer nodes of the inner circle node array [5];

[0014] If the quadrilateral unit node 2 and the quadrilateral unit node 3 are the first-layer inner circle nodes, the node number sequence is adjusted counterclockwise three times, and the quadrilateral unit node 4 and the quadrilateral unit node 1 are used to assign values to the second-layer nodes of the inner circle node array [5];

[0015] If the node No. 3 of the quadrilateral unit and the node No. 4 of the quadrilateral unit are the inner circle nodes of the first layer, the node number sequence is adjusted counterclockwise four times, and the nodes No. 1 of the quadrilateral unit and the node No. 2 of the quadrilateral unit are assigned to the second layer nodes of the inner circle node array [5];

[0016] If the quadrilateral unit node 4 and the quadrilateral unit node 1 are the first-layer inner circle nodes, the node number sequence is adjusted counterclockwise once, and the quadrilateral unit node 2 and the quadrilateral unit node 3 are used to assign values to the second-layer nodes of the inner circle node array [5];

[0017] Adjust the quadrilateral elements in each layer of the inner circle node array [5], and output the adjusted quadrilateral elements to the output file [9].

[0018] According to at least one embodiment of the present application, the above-mentioned method for adjusting the unit direction of the ring reinforcement finite element refined mesh model further includes:

[0019] Read the original file of the ring reinforcement finite element refined mesh model [1], and input the triangle elements therein into the triangle element array [7], including the triangle element number, triangle element attribute number, triangle element node 1, triangle element node 2, triangle element node 3, and triangle element judgment mark;

[0020] If the triangle unit node 1 and the triangle unit node 2 are the first-layer inner circle nodes, the node number sequence is adjusted counterclockwise once, and the triangle unit node 3 is used to assign the second-layer node of the inner circle node array [5];

[0021] If the triangle unit node 2 and the triangle unit node 3 are the first-level inner circle nodes, the node number sequence is adjusted counterclockwise twice, and the triangle unit node 1 is used to assign the second-level node of the inner circle node array [5];

[0022] If the triangle unit node 3 and the triangle unit node 1 are the first-layer inner circle nodes, the node number sequence is adjusted counterclockwise three times, and the triangle unit node 2 is used to assign the second-layer node of the inner circle node array [5];

[0023] If the triangle unit node 4 and the triangle unit node 1 are the first-layer inner circle nodes, the node number sequence is adjusted counterclockwise once, and the triangle unit node 2 and the triangle unit node 3 are used to assign values to the second-layer nodes of the inner circle node array [5];

[0024] Adjust the triangle units in each layer of the inner circle node array [5], and output the adjusted triangle units to the output file [9].

[0025] According to at least one embodiment of the present application, the above-mentioned method for adjusting the unit direction of the ring reinforcement finite element refined mesh model further includes:

[0026] Input the original file of the inner skin finite element refined mesh model [2] into the inner skin node array [4];

[0027] Assign initial values to the first layer inner circle nodes in the inner circle node array [5] using the inner skin node array [3];

[0028] Read the original file of the inner skin finite element refined mesh model [2], and input the quadrilateral elements therein into the quadrilateral element array [7], including the quadrilateral element number, quadrilateral element attribute number, quadrilateral element node 1, quadrilateral element node 2, quadrilateral element node 3, quadrilateral element node 4, and quadrilateral element judgment mark;

[0029] If the quadrilateral unit node 1 and the quadrilateral unit node 2 are the first-layer inner circle nodes, the node number sequence is adjusted counterclockwise twice, and the quadrilateral unit node 3 and the quadrilateral unit node 4 are used to assign values to the second-layer nodes of the inner circle node array [5];

[0030] If the quadrilateral unit node 2 and the quadrilateral unit node 3 are the first-layer inner circle nodes, the node number sequence is adjusted counterclockwise three times, and the quadrilateral unit node 4 and the quadrilateral unit node 1 are used to assign values to the second-layer nodes of the inner circle node array [5];

[0031] If the node No. 3 of the quadrilateral unit and the node No. 4 of the quadrilateral unit are the inner circle nodes of the first layer, the node number sequence is adjusted counterclockwise four times, and the nodes No. 1 of the quadrilateral unit and the node No. 2 of the quadrilateral unit are assigned to the second layer nodes of the inner circle node array [5];

[0032] If the quadrilateral unit node 4 and the quadrilateral unit node 1 are the first-layer inner circle nodes, the node number sequence is adjusted counterclockwise once, and the quadrilateral unit node 2 and the quadrilateral unit node 3 are used to assign values to the second-layer nodes of the inner circle node array [5];

[0033] Adjust the quadrilateral elements in each layer of the inner circle node array [5], and output the adjusted quadrilateral elements to the output file [9].

[0034] According to at least one embodiment of the present application, the above-mentioned method for adjusting the unit direction of the ring reinforcement finite element refined mesh model further includes:

[0035] Read the original file of the inner skin finite element refined mesh model [2], and input the triangle elements therein into the triangle element array [7], including the triangle element number, triangle element attribute number, triangle element node 1, triangle element node 2, triangle element node 3, and triangle element judgment mark;

[0036] If the triangle unit node 1 and the triangle unit node 2 are the first-layer inner circle nodes, the node number sequence is adjusted counterclockwise once, and the triangle unit node 3 is used to assign the second-layer node of the inner circle node array [5];

[0037] If the triangle unit node 2 and the triangle unit node 3 are the first-level inner circle nodes, the node number sequence is adjusted counterclockwise twice, and the triangle unit node 1 is used to assign the second-level node of the inner circle node array [5];

[0038] If the triangle unit node 3 and the triangle unit node 1 are the first-layer inner circle nodes, the node number sequence is adjusted counterclockwise three times, and the triangle unit node 2 is used to assign the second-layer node of the inner circle node array [5];

[0039] If the triangle unit node 4 and the triangle unit node 1 are the first-layer inner circle nodes, the node number sequence is adjusted counterclockwise once, and the triangle unit node 2 and the triangle unit node 3 are used to assign values to the second-layer nodes of the inner circle node array [5];

[0040] Adjust the triangle units in each layer of the inner circle node array [5], and output the adjusted triangle units to the output file [9].

[0041] This application has at least the following beneficial technical effects:

[0042] A method for adjusting the unit orientation of a ring reinforcement finite element refined mesh model is provided. The method extracts the first-layer inner circle nodes, determines the orientation of the first-layer units and adjusts the orientation of the first-layer inner circle units, and simultaneously extracts the second-layer inner circle nodes and adjusts the orientation of the second-layer units until all units are adjusted. This method can be implemented in a programmable manner and can efficiently and accurately adjust the unit orientation of a ring reinforcement finite element refined mesh model with a large number of units. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 Schematic diagram of a method for adjusting the unit direction of a ring reinforcement finite element refined mesh model provided in an embodiment of the present application;

[0044] Figure 2 It is a schematic diagram of the ring rib node array and the inner skin node array provided in an embodiment of the present application;

[0045] Figure 3 is a schematic diagram of an inner circle node array provided in an embodiment of the present application;

[0046] Figure 4 is a schematic diagram of a quadrilateral unit array provided in an embodiment of the present application;

[0047] Figure 5 is a schematic diagram of a triangular unit array provided in an embodiment of the present application;

[0048] Figure 6 is a schematic diagram of temporary variables provided in an embodiment of the present application;

[0049] Figure 7 is a schematic diagram of the quadrilateral unit direction provided in an embodiment of the present application;

[0050] Figure 8 Schematic diagram of the quadrilateral unit direction adjustment provided in an embodiment of the present application;

[0051] Figure 9 is a schematic diagram of the triangular unit direction provided in an embodiment of the present application;

[0052] Figure 10 This is a schematic diagram of the direction adjustment of the triangle unit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0053] To make the technical solution and its advantages of the present application clearer, the technical solution of the present application will be described in further detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of the present application and are only used to explain the present application, not to limit the present application. It should be noted that, for ease of description, only the parts related to the present application are shown in the accompanying drawings, and other related parts can refer to the general design. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other to obtain new embodiments.

[0054] In addition, unless otherwise defined, the technical or scientific terms used in the description of this application should have the ordinary meanings understood by those of ordinary skill in the art to which this application belongs. The words "upper," "lower," "left," "right," "center," "vertical," "horizontal," "inner," and "outer" used in the description of this application are only used to indicate relative directions or positional relationships, and do not imply that the device or component must have a specific orientation, be constructed, or operate in a specific orientation. When the absolute position of the described object changes, its relative positional relationship may also change accordingly. Therefore, they should not be understood as limitations on this application. The words "first," "second," "third," and similar terms used in the description of this application are used only for descriptive purposes to distinguish different components and should not be understood to indicate or imply relative importance. The words "one," "an," or "the" used in the description of this application should not be understood as absolute limitations on quantity, but should be understood as meaning the presence of at least one. The words "include" or "comprises" used in the description of this application mean that the element or object listed before the word includes the elements or objects listed after the word and their equivalents, but does not exclude other elements or objects.

[0055] In addition, it should be noted that, unless otherwise clearly stipulated and limited, the words "install", "connect", "connect" and similar terms used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection between two components. Technical personnel in the field can understand their specific meanings in this application according to the specific circumstances.

[0056] The following is combined with Figures 1 to 10 This application is described in further detail.

[0057] The original file of the ring reinforcement finite element refined mesh model [1] and the original file of the inner skin finite element refined mesh model [2] are input into the ring reinforcement node array [3] and the inner skin node array [4] respectively.

[0058] The inner circle node array [5] of the first layer is initialized by the ring rib node array [3] and the inner skin node array [4]. The inner circle node array is a two-dimensional array, and the number of layers here corresponds to the first dimension value of the array, that is, the first layer inner circle node number is assigned to [1:i] in the inner circle node array.

[0059] According to the analysis of graphic characteristics, such as Figure 7 As long as nodes 3 and 4 of the quadrilateral element shown in the figure belong to the inner node array, the X direction of the quadrilateral element meets the requirement of pointing counterclockwise. Keeping the order of the nodes in accordance with the right-hand screw rule ensures that the X direction always points counterclockwise.

[0060] According to the analysis of graphic characteristics, such as Figure 8 As shown in FIG, as long as the triangle element satisfies the requirement that nodes 1 and 3 belong to the inner circle node array, the X direction of the triangle element meets the requirement of pointing counterclockwise.

[0061] Re-read the original file of the ring reinforcement finite element refined mesh model [1], and input the quadrilateral elements and triangular elements in the ring reinforcement model into the quadrilateral element array [6] and triangular element array [7] respectively.

[0062] The data contained in the quadrilateral unit array [6] include: quadrilateral unit number, quadrilateral unit attribute number, quadrilateral unit node 1, quadrilateral unit node 2, quadrilateral unit node 3, quadrilateral unit node 4, and quadrilateral unit judgment mark;

[0063] The data contained in the triangle array [7] include: triangle unit number, triangle unit attribute number, triangle unit node 1, triangle unit node 2, triangle unit node 3, and triangle unit judgment mark.

[0064] A large loop is established to adjust the directions of all units. The outermost loop is a layer-by-layer loop. First, the quadrilateral unit array [7] is judged. As long as the quadrilateral unit satisfies the condition that two of its nodes belong to the first-layer inner circle node array, the quadrilateral unit is determined to be a first-layer unit and adjusted according to the direction rule. At the same time, the remaining two node numbers in the quadrilateral unit are assigned to the second layer of the inner circle node array [5]. The direction adjustment logic of the quadrilateral unit is as follows:

[0065] If points 1 and 2 are inner circle nodes of the first layer, the order of the node numbers needs to be adjusted counterclockwise twice, such as Figure 9 As shown;

[0066] If points 2 and 3 are inner circle nodes of the first layer, the order of the node numbers needs to be adjusted counterclockwise three times;

[0067] If points 3 and 4 are nodes in the inner circle of the first layer, the node number sequence needs to be adjusted counterclockwise four times (equivalent to no adjustment);

[0068] If points 4 and 1 are nodes in the inner circle of the first layer, the order of the node numbers needs to be adjusted counterclockwise once;

[0069] Output the adjusted quadrilateral elements to the output file [9].

[0070] After completing the direction adjustment of the inner circle node quadrilateral unit of the first layer of the inner circle node array [5], adjust the inner circle node triangle unit of the first layer. First, determine whether there are two nodes in the triangle unit that belong to the first layer of the inner circle node array [5]. If so, the triangle unit belongs to the first layer unit and is adjusted according to the direction rule. At the same time, the remaining node number in the triangle unit is assigned to the second layer of the inner circle node array [5]. The direction adjustment logic of the triangle unit is as follows:

[0071] If points 1 and 2 are nodes in the inner circle of the first layer, the order of the node numbers needs to be adjusted counterclockwise, such as Figure 10 As shown;

[0072] If points 2 and 3 are inner circle nodes of the first layer, the order of the node numbers needs to be adjusted counterclockwise twice;

[0073] If points 1 and 3 are nodes in the inner circle of the first layer, the node number sequence needs to be adjusted three times counterclockwise (equivalent to no adjustment);

[0074] Output the adjusted triangular elements to the output file [9].

[0075] When the orientation adjustment of all the units in the first layer is completed, the assignment operation is performed on the nodes in the second layer in the inner circle node array at the same time. Then the second layer in the large loop can be entered again to judge all the units in the second layer until the orientation of the units in the Nth layer is adjusted. The output file [9] of the complex surface is input into PATRAN, and the ring reinforcement finite element refined mesh model with consistent orientation adjustment of the units can be obtained.

[0076] The method for adjusting the unit direction of the ring reinforcement finite element refined mesh model disclosed in the present application is based on the comparison of two types of technologies: multiple numerical algorithms and graphic characteristic analysis in the early stage. By screening the inner circle nodes, a multi-layer inner circle node array is established, the inner circle nodes of the unit are judged, and the unit node sequence adjustment steps are directly given according to the node sequence logic, thereby realizing an efficient program without numerical calculation. It only performs graphic analysis on the units, quickly determines the direction adjustment logic and related adjustment steps of each unit, and can realize fast and efficient adjustment of the unit direction.

[0077] So far, the technical solution of the present application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the scope of protection of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or replacements to the relevant technical features, and the technical solutions after these changes or replacements will fall within the scope of protection of the present application.

Claims

1. A method for adjusting the unit direction of a ring reinforcement finite element mesh model, characterized in that: include: Input the original file of the ring reinforcement finite element refined mesh model [1] into the ring reinforcement node array [3]; Assign initial values to the first layer inner circle nodes in the inner circle node array [5] using the ring reinforcement node array [3]; Read the original file of the finite element refined mesh model with ring reinforcement [1], and input the quadrilateral elements therein into the quadrilateral element array [6], including the quadrilateral element number, quadrilateral element attribute number, quadrilateral element node 1, quadrilateral element node 2, quadrilateral element node 3, quadrilateral element node 4, and quadrilateral element judgment mark; If the quadrilateral unit node 1 and the quadrilateral unit node 2 are the first-layer inner circle nodes, the node number sequence is adjusted counterclockwise twice, and the quadrilateral unit node 3 and the quadrilateral unit node 4 are used to assign values to the second-layer nodes of the inner circle node array [5]; If the quadrilateral unit node 2 and the quadrilateral unit node 3 are the first-layer inner circle nodes, the node number sequence is adjusted counterclockwise three times, and the quadrilateral unit node 4 and the quadrilateral unit node 1 are used to assign values to the second-layer nodes of the inner circle node array [5]; If the node No. 3 of the quadrilateral unit and the node No. 4 of the quadrilateral unit are the inner circle nodes of the first layer, the node number sequence is adjusted counterclockwise four times, and the nodes No. 1 of the quadrilateral unit and the node No. 2 of the quadrilateral unit are assigned to the second layer nodes of the inner circle node array [5]; If the quadrilateral unit node 4 and the quadrilateral unit node 1 are the first-layer inner circle nodes, the node number sequence is adjusted counterclockwise once, and the quadrilateral unit node 2 and the quadrilateral unit node 3 are used to assign values to the second-layer nodes of the inner circle node array [5]; Adjust the quadrilateral elements in each layer of the inner circle node array [5], and output the adjusted quadrilateral elements to the output file [9].

2. The method for adjusting the unit direction of the ring reinforcement finite element refined mesh model according to claim 1, characterized in that: Also includes: Read the original file of the ring reinforcement finite element refined mesh model [1], and input the triangle elements therein into the triangle element array [7], including the triangle element number, triangle element attribute number, triangle element node 1, triangle element node 2, triangle element node 3, and triangle element judgment mark; If the triangle unit node 1 and the triangle unit node 2 are the first-layer inner circle nodes, the node number sequence is adjusted counterclockwise once, and the triangle unit node 3 is used to assign the second-layer node of the inner circle node array [5]; If the triangle unit node 2 and the triangle unit node 3 are the first-level inner circle nodes, the node number sequence is adjusted counterclockwise twice, and the triangle unit node 1 is used to assign the second-level node of the inner circle node array [5]; If the triangle unit node 3 and the triangle unit node 1 are the first-layer inner circle nodes, the node number sequence is adjusted counterclockwise three times, and the triangle unit node 2 is used to assign the second-layer node of the inner circle node array [5]; If the triangle unit node 4 and the triangle unit node 1 are the first-layer inner circle nodes, the node number sequence is adjusted counterclockwise once, and the triangle unit node 2 and the triangle unit node 3 are used to assign values to the second-layer nodes of the inner circle node array [5]; Adjust the triangle units in each layer of the inner circle node array [5], and output the adjusted triangle units to the output file [9].

3. The method for adjusting the unit direction of the ring reinforcement finite element refined mesh model according to claim 1, characterized in that: Also includes: Input the original file of the inner skin finite element refined mesh model [2] into the inner skin node array [4]; Assign initial values to the first layer inner circle nodes in the inner circle node array [5] using the inner skin node array [3]; Read the original file of the inner skin finite element refined mesh model [2], and input the quadrilateral elements therein into the quadrilateral element array [7], including the quadrilateral element number, quadrilateral element attribute number, quadrilateral element node 1, quadrilateral element node 2, quadrilateral element node 3, quadrilateral element node 4, and quadrilateral element judgment mark; If the quadrilateral unit node 1 and the quadrilateral unit node 2 are the first-layer inner circle nodes, the node number sequence is adjusted counterclockwise twice, and the quadrilateral unit node 3 and the quadrilateral unit node 4 are used to assign values to the second-layer nodes of the inner circle node array [5]; If the quadrilateral unit node 2 and the quadrilateral unit node 3 are the first-layer inner circle nodes, the node number sequence is adjusted counterclockwise three times, and the quadrilateral unit node 4 and the quadrilateral unit node 1 are used to assign values to the second-layer nodes of the inner circle node array [5]; If the node No. 3 of the quadrilateral unit and the node No. 4 of the quadrilateral unit are the inner circle nodes of the first layer, the node number sequence is adjusted counterclockwise four times, and the nodes No. 1 of the quadrilateral unit and the node No. 2 of the quadrilateral unit are assigned to the second layer nodes of the inner circle node array [5]; If the quadrilateral unit node 4 and the quadrilateral unit node 1 are the first-layer inner circle nodes, the node number sequence is adjusted counterclockwise once, and the quadrilateral unit node 2 and the quadrilateral unit node 3 are used to assign values to the second-layer nodes of the inner circle node array [5]; Adjust the quadrilateral elements in each layer of the inner circle node array [5], and output the adjusted quadrilateral elements to the output file [9].

4. The method for adjusting the unit direction of the ring reinforcement finite element refined mesh model according to claim 3, characterized in that: Also includes: Read the original file of the inner skin finite element refined mesh model [2], and input the triangle elements therein into the triangle element array [7], including the triangle element number, triangle element attribute number, triangle element node 1, triangle element node 2, triangle element node 3, and triangle element judgment mark; If the triangle unit node 1 and the triangle unit node 2 are the first-layer inner circle nodes, the node number sequence is adjusted counterclockwise once, and the triangle unit node 3 is used to assign the second-layer node of the inner circle node array [5]; If the triangle unit node 2 and the triangle unit node 3 are the first-level inner circle nodes, the node number sequence is adjusted counterclockwise twice, and the triangle unit node 1 is used to assign the second-level node of the inner circle node array [5]; If the triangle unit node 3 and the triangle unit node 1 are the first-layer inner circle nodes, the node number sequence is adjusted counterclockwise three times, and the triangle unit node 2 is used to assign the second-layer node of the inner circle node array [5]; If the triangle unit node 4 and the triangle unit node 1 are the first-layer inner circle nodes, the node number sequence is adjusted counterclockwise once, and the triangle unit node 2 and the triangle unit node 3 are used to assign values to the second-layer nodes of the inner circle node array [5]; Adjust the triangle units in each layer of the inner circle node array [5], and output the adjusted triangle units to the output file [9].

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