JP5286961B2 - Data array changing method and data array changing computer program - Google Patents

Description

  The present invention relates to rearranging obtained data in a simulation of a structure using a computer.

  A method of evaluating the performance of a structure by simulation using a computer and designing the structure based on the evaluation has been proposed and put into practical use. For example, Patent Literature 1 and Patent Literature 2 disclose a method of creating a tire model in which a tire is divided into a plurality of elements using a finite element method and simulating the performance of the tire using the tire model.

Japanese Patent No. 3314082 JP 2001-282873 A

  After the simulation is completed, information for evaluating the performance of the tire, for example, physical quantities such as tension and displacement, is extracted from each element constituting the tire model. In this case, for example, in a cord material such as a carcass or a belt, the physical quantity is acquired in the arrangement order of elements for convenience of evaluation, as in the case of evaluating the distribution of the physical quantity toward the extending direction of the cord material, There is a request to arrange.

  Until now, the change in the arrangement of such data has been done by the operator manually rearranging the extracted physical quantities etc. based on the geometric information of the analysis model of the structure represented by the tire model, It took time and effort. Patent Documents 1 and 2 do not disclose this point, and there is room for improvement with regard to simply changing the data arrangement.

  This invention is made | formed in view of the above, Comprising: It aims at reducing the effort at the time of rearranging the obtained data in the simulation of the structure using a computer.

  In order to solve the above-described problems and achieve the object, a data array changing method according to the present invention divides a structure to be evaluated for performance into a plurality of elements composed of a plurality of nodes, and a computer. An analysis model creation procedure for creating an analysis model that can be analyzed by the method, an element setting procedure for setting an information acquisition target element that is a target for acquiring performance evaluation information for evaluating the performance of the structure from a plurality of the elements, and An element extraction procedure for extracting adjacent elements that share nodes that are not included in the information acquired element that has already acquired the performance evaluation information, among the nodes constituting the information acquisition target element; and the information acquisition target element And obtaining the performance evaluation information from the information acquisition procedure, the information acquisition target element after acquiring the performance evaluation information as the information acquisition element, and the adjacent element as a new previous A target element change procedure to be set as an information acquisition target element, and repeats the element extraction procedure, the information acquisition procedure, and the target element change procedure until a predetermined end condition, and a plurality of extracted performance evaluations The information is arranged in the order of acquisition.

  As a desirable mode of the present invention, in the data array changing method, an element as a starting point for starting extraction of the performance evaluation information is set from a plurality of the elements, and the performance evaluation information of the element as the starting point is set. It is preferable to provide a starting element setting procedure for extraction.

  As a desirable aspect of the present invention, in the data array changing method, when the element is composed of two nodes, the element extraction procedure has already performed the performance evaluation among the nodes constituting the information acquisition target element. It is preferable to extract adjacent elements that share points that do not include nodes included in the information acquired element that is the element from which information has been acquired.

  As a desirable aspect of the present invention, in the data array changing method, when the element is composed of 4 nodes or 8 nodes, in the element extraction procedure, among the nodes constituting the information acquisition target element, It is preferable to extract an adjacent element that shares a surface that does not include a node constituting a surface included in the information acquired element that is the element from which the performance evaluation information has been acquired.

  As a desirable aspect of the present invention, in the data array changing method, the elements from which the performance evaluation information is acquired are preferably the same type of material.

  As a desirable mode of the present invention, in the data arrangement changing method, it is preferable to end the repetition when the adjacent element is not extracted in the element extraction procedure.

  As a desirable mode of the present invention, in the data arrangement changing method, it is preferable that the structure is a tire and the information acquisition target element corresponds to a cord material of the tire.

  In order to solve the above-described problems and achieve the object, a computer program for changing data arrangement according to the present invention causes a computer to execute the data arrangement changing method.

  The present invention can reduce the trouble of rearranging the obtained data in the simulation of the structure using a computer.

  Hereinafter, the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following description. In addition, constituent elements in the following description include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in a so-called equivalent range. The present invention can be applied to a simulation for evaluating the performance of a structure using a computer, and the structure is not limited to a tire. In the following, a tire is taken as an example of the structure. When the present invention is applied to a tire, the present invention is not limited to a pneumatic tire but can be applied to all tires.

  In this embodiment, in the simulation (numerical analysis) of a structure using a computer, performance evaluation information such as a physical quantity for evaluating the performance of the structure in the simulation, that is, the analysis model of the structure after the analysis is completed Among the nodes constituting the information acquisition target element to be acquired, by extracting adjacent elements that share nodes that are not included in the information acquired element that has already acquired the performance evaluation information, the structure of the target for which performance is evaluated ( For example, the physical quantity of the elements constituting the structure is arranged in the arrangement order of a plurality of elements in a carcass or a belt of a tire). In the following, sharing a node, side, or surface means that the node, side, or surface coordinates or the node number, side number, or surface number set when creating the analysis model (tire model in this embodiment) match. To do.

  FIG. 1 is a sectional view showing a meridional section of a tire. The meridional section is a section when the tire 1 is cut along a plane parallel to the tire rotation axis (Y-axis) and including the rotation axis. A carcass 2, a belt 3, a belt cover 4, and a bead core 5 appear on the meridional section of the tire 1. The tire 1 is a composite material structure in which rubber as a base material is reinforced by a reinforcing cord such as a carcass 2, a belt 3, or a belt cover 4 as a reinforcing material. Here, a layer made of a cord material such as a metal fiber or an organic fiber, such as the carcass 2, the belt 3, and the belt cover 4, is referred to as a cord layer.

  The carcass 2 is a strength member that serves as a pressure vessel when the tire 1 is filled with air. The carcass 2 supports a load by its internal pressure and withstands a dynamic load during traveling. The belt 3 is a layer of reinforcing cords in which rubberized cords arranged between the cap tread and the carcass 2 are bundled. In the case of a bias tire, it is called a breaker. In the radial tire, the belt 3 plays an important role as a shape maintaining and strength member.

  A belt cover 4 is disposed on the grounding surface 9 side of the belt 3. The belt cover 4 is formed by arranging, for example, organic fiber materials in layers, and has a role as a protective layer for the belt 3 and a role as a reinforcing layer for the belt 3. The bead core 5 is a bundle of steel wires that supports the cord tension generated in the carcass 2 by internal pressure. The bead core 5 becomes a strength member of the tire 1 together with the carcass 2, the belt 3, the belt cover 4, and the tread.

  A groove 7 is formed on the grounding surface 9 side of the tire 1. This improves drainage during rainy weather. The land portion 6 is formed by dividing the rubber disposed on the front surface side of the tire 1 with the groove 7. A pattern formed by the grooves 7 is referred to as a tread pattern. A side portion of the tire 1 is called a sidewall 8 and connects between the bead core 5 and the ground plane 9. Further, a shoulder portion Sh is provided between the ground plane 9 and the sidewall 8.

  FIG. 2A is a schematic diagram in which the tire carcass is analytically modeled with line elements composed of a plurality of nodes. FIGS. 2-2 and 2-3 are diagrams showing the tension of the nodes constituting the carcass analysis model shown in FIG. When evaluating the performance of a tire by simulation, the tire to be evaluated is approximated by an analysis model that can be analyzed by a computer, and rolling simulation or deformation simulation is executed. When evaluating the results obtained by rolling simulation or deformation simulation, for example, a physical quantity QP such as stress, tension, or strain is obtained from each element of the tire model after the simulation is executed, and a distribution diagram of the physical quantity QP is obtained. Create

  For example, the carcass 2 illustrated in FIG. 2A is modeled by 13 line elements including nodes N1 to N14. The element numbers (EL_ID) of the elements constituting the carcass 2 are 101, 543, 755, 651, 559, 211, 356, 421, 263, from the equatorial plane CC side of the tire model toward the extending direction of the carcass 2. 109, 445, 622, and 776. If the physical quantity QP after completion of the rolling simulation and the deformation simulation is also extracted in this order, it is not necessary to rearrange the physical quantities QP when creating the distribution map of the physical quantity QP.

  However, in general, the arrangement order of the elements constituting the carcass 2 and the belt 3 in the extending direction of the carcass 2 and the belt 3 does not match the order in which the physical quantities of the respective elements are extracted. In particular, when a computer program that automatically generates elements is used in the creation of a tire model, the element numbers depend on the computer program, so that element numbers are assigned in order to facilitate handling as a continuous structure. It becomes difficult.

  As a result, it is necessary to rearrange the physical quantities QP extracted in the order as shown in FIG. 2-2 according to the arrangement order of the elements constituting the carcass 2 as shown in FIG. 2-3. In particular, a cord material structure such as the carcass 2 or the belt 3 is preferably handled in a continuous manner in consideration of the efficiency of evaluation.

  Until now, the physical quantity QP extracted in the form as shown in FIG. 2-2 has been rearranged manually by the operator, so the workload is large and the rearrangement takes a long time. This becomes more remarkable as the number of elements to be rearranged increases. In the present embodiment, the burden of this work is reduced by a method of changing the data arrangement described later. First, an apparatus for executing the data array changing method according to the present embodiment will be described.

  FIG. 3 is an explanatory diagram illustrating a configuration of the tire performance evaluation apparatus according to the present embodiment. A tire performance evaluation apparatus 50 shown in FIG. 3 executes a numerical simulation of a tire and executes a data arrangement changing method according to the present embodiment. The tire performance evaluation device 50 includes a processing unit 50p and a storage unit 50m. The processing unit 50p and the storage unit 50m are connected via an input / output unit (I / O) 59.

  The processing unit 50p includes a model creation unit 51, an analysis unit 52, an element extraction unit 53, a performance evaluation information acquisition unit 54, a condition determination unit 55, and a data array change unit 56. The model creation unit 51, the analysis unit 52, the element extraction unit 53, the performance evaluation information acquisition unit 54, the condition determination unit 55, and the data array change unit 56 are connected to the input / output unit 59. It is configured to exchange data.

  The model creation unit 51 creates an analysis model (tire model) of the tire to be evaluated. The analysis unit 52 performs rolling analysis, deformation analysis, and the like on the tire model created by the model creation unit 51. The element extraction unit 53 extracts a tire model (analysis model) element for acquiring information for evaluating the performance of the tire (structure). The performance evaluation information acquisition unit 54 acquires information for evaluating the performance of the tire (structure) from the elements extracted by the element extraction unit 53 and stores the information in the storage unit 50m. The condition determination unit 55 determines whether to continue extracting elements and extracting information for evaluating tire performance. The data array changing unit 56 arranges information for evaluating the acquired performance in the order of acquisition.

A terminal device 60 is connected to the input / output unit 59, and data necessary for executing a numerical simulation of the tire, that is, a rolling analysis or a deformation analysis of the tire, for example, physical properties of the rubber constituting the tire 1 Values, physical properties of the cord material, boundary conditions and running conditions in rolling analysis and deformation analysis, and the like are given to the tire performance evaluation device 50 by the input device 61 connected to the terminal device 60. The input / output unit 59 receives tire evaluation data from the tire performance evaluation device 50 and displays the tire model on the display device 62 connected to the terminal device 60. Further, the input / output unit 59 displays information for evaluating the performance of the tires rearranged by the data arrangement changing method according to the present embodiment, a distribution map thereof, and the like on the display device 62. Furthermore, various data servers 64 ₁ , 64 _2, etc. are connected to the input / output unit 59 via the network 63. In executing the data array changing method according to the present embodiment, the processing unit 50p is configured to be able to use various databases stored in the various data servers 64 ₁ , 64 ₂ and the like.

The storage unit 50m includes a computer program for causing the processing unit 50p to execute a data arrangement changing method (details will be described later), a tire analysis method, a tire design method, and the like according to the present embodiment, and various data servers 64. _1, 64 were obtained from ₂ or the like, data such as material properties, information elements and nodes constituting the tire model (coordinates, material constants and elements and nodes identification information) are stored. Data such as material properties are used when performing tire rolling analysis or deformation analysis. Here, the storage unit 50m can be configured by a volatile memory such as a RAM (Random Access Memory), a nonvolatile memory such as a flash memory, or a combination thereof. The processing unit 50p can be configured by a memory and a CPU (Central Processing Unit). The storage unit 50m may be built in the processing unit 50p or may be in another device (for example, a database server). Thus, the tire performance evaluation device 50 may access the processing unit 50p and the storage unit 50m from the terminal device 60 by communication.

  The above computer program is combined with a computer program already recorded in the model creation unit 51, the analysis unit 52, the element extraction unit 53, or the like included in the processing unit 50p, thereby processing the data array changing method according to the present embodiment. May be realized. Further, the tire performance evaluation apparatus 50 uses a dedicated hardware instead of the computer program, and a model creation unit 51, an analysis unit 52, an element extraction unit 53, a performance evaluation information acquisition unit 54 provided in the processing unit 50p, The functions of the condition determining unit 55 and the data array changing unit 56 may be realized. Next, a procedure for realizing the data array changing method according to the present embodiment using the tire performance evaluation apparatus 50 will be described.

  FIG. 4 is a flowchart illustrating the procedure of the data arrangement changing method according to the present embodiment. FIG. 5 is a perspective view showing the entire tire model. 6 and 7 are partial cross-sectional views showing a part of the meridian cross section of the tire model shown in FIG. FIGS. 8-10 is a schematic diagram which shows the method of extracting the element which acquires the information for evaluating the performance of a tire. The data arrangement changing method according to the present embodiment is used when the performance of a tire is evaluated or the tire is designed by a numerical simulation using a computer.

  In step S101, first, the model creation unit 51 of the processing unit 50p included in the tire performance evaluation device 50 creates a tire model 10 (see FIG. 5) that is an analysis model of the tire from a tire that is an evaluation target. This step S101 corresponds to an analysis model creation procedure. In the present embodiment, the tire model 10 is a model that can be analyzed by a computer using a numerical analysis method such as a finite element method or a finite difference method, for performing a rolling analysis or a deformation analysis. Includes mathematical models and mathematical discretization models. In addition, when performing a rolling analysis, a deformation | transformation analysis, etc. with respect to the tire model 10, you may create the road surface model contacted with the tire model 10 by step S101. The road surface model is created in the same manner as the tire model 10.

  In this embodiment, a finite element method (FEM) is used as an analysis method used for rolling analysis, deformation analysis, or the like of the tire model 10. The analysis method applicable to the data array changing method according to the present embodiment is not limited to the finite element method, and a boundary element method (BEM), a finite difference method (FDM), or the like can also be used. Further, the most appropriate analysis method can be selected according to the boundary condition or the like, or a plurality of analysis methods can be used in combination. Since the finite element method is an analysis method suitable for structural analysis, it can be suitably applied particularly to structures such as tires.

  In step S101, the model creation unit 51 divides the tire whose performance is to be evaluated into a finite number of elements 10E1, 10E2,... 10En composed of a plurality of nodes 11N shown in FIG. The tire model 10 shown in FIG. 5 is created. In the present embodiment, the tire model 10 has a three-dimensional shape as shown in FIG. 5, but the tire model 10 is not limited to a three-dimensional shape. Depending on the type of analysis, the tire model may be a two-dimensional model in which the meridional cross-sectional shape of the tire and the structure in the meridian cross-section are analytically modeled.

  Elements constituting the tire model 10 include, for example, a solid element such as a line element, a quadrilateral element in a two-dimensional plane, a tetrahedral solid element in a three-dimensional body, a pentahedral solid element, a hexahedral solid element, a triangular shell element, 4 It is desirable to use an element that can be used in a computer, such as a shell element such as a square shell element, or a surface element. In the process of analysis, the elements divided in this way are identified one by one using three-dimensional coordinates in the three-dimensional model and using two-dimensional coordinates in the two-dimensional model.

  The tire model 10 shown in FIG. 6 is configured by configuring the carcass 2 of the tire model 10 with line elements each having two nodes in a meridional section. Further, the tire model 10 shown in FIG. 7 is configured by forming the carcass 2 of the tire model 10 with solid elements (plane elements) each having four nodes in a meridional section.

  If the tire model 10 which is an analysis model is created in step S101, the process proceeds to step S102. In step S <b> 102, the analysis unit 52 of the processing unit 50 p included in the tire performance evaluation device 50 performs rolling analysis, deformation analysis, and the like on the created tire model 10. As a result, the carcass 2, the belt 3, and the like, which are constituent elements of the tire model 10, receive a load or deform. Physical quantities such as tension and displacement of the carcass 2 and belt 3 after the analysis are acquired as information (performance evaluation information) for evaluating the tire performance, and the tire performance is evaluated.

  In this embodiment, when evaluating the tension, displacement, etc. of the carcass 2, performance evaluation information is acquired from the elements constituting the carcass 2. The performance evaluation information includes, for example, physical coordinates such as tension, strain, and displacement, as well as information on the coordinates of the nodes constituting the element, which is information for specifying the element. As described above, when the tension and strain of the carcass 2 and the belt 3 are evaluated, it is preferable that the tension, strain, and the like are arranged in the order in which the elements constituting the carcass 2 and the like are arranged. In the data arrangement changing method according to the present embodiment, physical quantities such as tension and strain, that is, performance evaluation information are arranged in the order in which elements constituting the carcass 2 and the like are arranged in an easy manner by the method described below. Next, the data array changing method according to the present embodiment will be described by taking the carcass 2 as an example.

  In the data arrangement changing method according to the present embodiment, starting from a certain element constituting the carcass 2 of the tire model 10, the performance evaluation information of each element arranged in the direction in which the carcass 2 extends is acquired, Arrange in the order of arrangement of the elements. For example, starting from the element 10Es present on the equator plane CC of the tire model 10 shown in FIGS. 6 and 7, the performance from each element in the direction in which the carcass 2 extends to the end element 10Ee in order. Get evaluation information. For this reason, in the data array changing method according to the present embodiment, first, in step S103, a starting point element that is a starting point for starting extraction of performance evaluation information is set.

  In the example shown in FIGS. 6 and 7, the element 10 Es present on the equator plane CC of the tire model 10 is the starting element. The starting element may be an element at the center of symmetry of the tire model 10 (for example, an element present on the equator plane CC) or an element present at the end of a structure constituting the tire such as the carcass 2 or the belt 3. preferable. For example, the starting element information (coordinates, ID, etc.) may be stored in advance in the storage unit 50m of the tire performance evaluation device 50. Further, the starting point information may be set by storing the starting point element information from the input device 61 in the storage unit 50m by the manual operation of the operator.

  In setting the starting element, it is preferable to set the direction in which the performance evaluation information is acquired from the structure. For example, when the structure is the carcass 2, the performance evaluation information of the elements constituting the carcass is acquired from the starting element toward the extending direction of the carcass 2. When the starting element exists at the end of the structure, that is, the carcass 2, the direction in which the carcass 2 extends is one direction, and therefore the direction in which the performance evaluation information is acquired from the structure is uniquely determined. In this case, for example, since the nodes and faces of the starting element existing in the extending direction of the carcass 2 are specified, the elements adjacent to the direction of the nodes and faces are sequentially extracted, and the performance evaluation information of the extracted elements To get.

  When the starting element is present in the middle of the structure, that is, the carcass 2, the direction in which the carcass 2 extends is two directions, and the direction in which the performance evaluation information is acquired from the structure is not uniquely determined. In this case, for example, a node or face of the starting element that is present in the direction in which the performance evaluation information is acquired from the structure is specified. Then, the elements adjacent in the direction of the nodes and surfaces are sequentially extracted, and the performance evaluation information of the extracted elements is acquired.

  When the starting point element is set, the process proceeds to step S104, and the performance evaluation information acquisition unit 54 of the processing unit 50p included in the tire performance evaluation device 50 performs the performance from the set starting point element (for example, the element 10Es in FIGS. 6 and 7). Evaluation information (for example, tension) is acquired and stored in the storage unit 50m. Steps S103 and S104 correspond to a starting point element setting procedure.

  Next, it progresses to step S105 and the model preparation part 51 sets the information acquisition object element which is the object which acquires performance evaluation information from the several element which comprises the carcass 2. FIG. This step S105 corresponds to an element setting procedure. In step S105, an element for acquiring performance evaluation information next to the starting element is set as an information acquisition target element. For example, when the starting element exists in the middle of a plurality of elements constituting the carcass 2, the carcass 2 extends in two directions when the starting element is used as a reference. Acquire performance evaluation information from multiple elements.

  Therefore, an element that is adjacent to the starting element and that is on the side in which the performance evaluation information is acquired (one direction of the extending direction of the carcass 2) is an element that acquires the performance evaluation information next to the starting element. Become. Specifically, the element sharing the node on the direction side in which the performance evaluation information of the starting element is acquired is the element that acquires the performance evaluation information next to the starting element. The model creation unit 51 obtains node and element information (position information such as coordinates and element and node identification information) of the tire model 10 stored in the storage unit 50m, and obtains performance evaluation information of the starting element. The elements adjacent to the direction to be extracted are extracted, and the coordinates of the nodes and the identification information of the nodes and elements are stored in the storage unit 50m.

  Further, when the starting point element is an end portion of the carcass 2, the extending direction of the carcass 2 is only one direction based on the starting point element. In this case, performance evaluation information is acquired from a plurality of elements constituting the carcass 2 from the starting element toward the extending direction of the carcass 2. Therefore, the element that is adjacent to the starting element and that is in the direction in which the performance evaluation information is acquired, that is, on the extending direction side of the carcass 2 is the element that acquires the performance evaluation information next to the starting element.

  Specifically, the direction in which the performance evaluation information of the starting point element is acquired, that is, the element sharing the node on the extending direction side of the carcass 2 is the element that acquires the performance evaluation information next to the starting point element. The model creation unit 51 acquires information on nodes and elements (position information such as coordinates and element and node identification information) of the tire model 10 stored in the storage unit 50m, and extends the carcass 2 as a starting element. Elements adjacent to the direction side are extracted, and the coordinates of the nodes, the identification information of the nodes and elements, and the like are stored in the storage unit 50m.

  In the present embodiment, elements that exist in the direction in which the performance evaluation information is acquired, that is, the extending direction of the carcass 2 and for which the performance evaluation information is acquired, are sequentially extracted with reference to the information acquisition target element. For this reason, when the element that acquires the performance evaluation information after the starting element is set as the information acquisition target element, the process proceeds to step S106 and is different from the starting element that is adjacent to the element that acquires the performance evaluation information after the starting element. Elements are extracted.

  For this reason, in step S106, the element extraction unit 53 included in the processing unit 50p of the tire performance evaluation apparatus 50 selects the information acquisition target element extracted in step S105, that is, an element for acquiring performance evaluation information next to the starting element. Of the nodes constituting the node, nodes that are not included in the information-acquired element (in this case, the starting element) for which information has already been acquired are extracted. This node is called a common node. Then, the process proceeds to step S107, and the element extraction unit 53 extracts elements sharing the common node from the node and element information of the tire model 10 stored in the storage unit 50m. Elements that share this common node are called adjacent elements. Steps S106 and S107 correspond to an element extraction procedure.

  Next, it progresses to step S108, and the performance evaluation information acquisition part 54 acquires the performance evaluation information of the element which acquires performance evaluation information next to an information acquisition object element, ie, a starting element, and stores it in the memory | storage part 50m. Then, the model creation unit 51 changes the information acquisition target element after acquiring the performance evaluation information to an information acquired element for which the performance evaluation information has already been acquired, and stores this information in the storage unit 50m. For example, a performance evaluation information acquired flag Fgf is used as information indicating that the element is an information acquired element. Step S108 corresponds to an information acquisition procedure.

  In step S109, the model creation unit 51 sets the adjacent element extracted in step S107 as a new information acquisition target element, and stores this information in the storage unit 50m. For example, a performance evaluation information acquisition target flag Fgg is used as information indicating a new information acquisition target element. Step S109 corresponds to a target element changing procedure. And it progresses to step S110 and the condition determination part 55 with which the process part 50p of the tire performance evaluation apparatus 50 is provided determines whether the conditions which complete | finish acquisition of performance evaluation information are satisfy | filled.

  In the present embodiment, for example, when the adjacent element is not extracted in step S107 or when the adjacent element of the material different from the element from which the performance evaluation information has been acquired is extracted, the acquisition of the performance evaluation information is finished. To do. In addition, elements having material constants in the preset range (may be the same material constants) are extracted, and when elements having material constants exceeding the range are extracted, performance evaluation information is acquired. You may end. In this way, by determining whether or not to end the acquisition of performance evaluation information based on the material constant, the structure from which performance evaluation information is to be extracted can be reliably identified from other structures even when the element is a surface element. it can.

  Further, when the extracted adjacent element is a member end (for example, the end of the carcass 2), the acquisition of the performance evaluation information may be terminated. In this case, whether or not the adjacent element extracted from the element information (node coordinates, node and element identification information, etc.) stored in the storage unit 50m of the tire performance evaluation device 50 is a member end. judge. For example, in the example shown in FIG. 8, the element including the node (end node) 11Nend existing at the end of the carcass 2 is the element at the end of the carcass 2. Therefore, when the extracted adjacent element includes the end node 11Nend, it can be determined that the adjacent element exists at the end of the carcass 2.

  Furthermore, in this embodiment, when performance evaluation information is acquired from a predetermined number of elements, it may be set so as to satisfy a condition for ending acquisition of performance evaluation information. For example, since the number of elements constituting the carcass 2 is determined by creating the tire model 10, if the performance evaluation information is acquired by the number of elements constituting the carcass 2, all the elements constituting the carcass 2 are obtained. It can be determined that the performance evaluation information has been acquired from

  When it is determined No in step S110, that is, when the condition determination unit 55 determines that the condition for ending the acquisition of performance evaluation information is not satisfied, the step until the condition for ending the acquisition of performance evaluation information is satisfied S106 to step S110 are repeated. When the condition for ending the acquisition of performance evaluation information is not satisfied, the process returns to step S106, and the element extraction unit 53 sets the new information acquisition target element set in step S109 (that is, the adjacent element extracted in the previous step S107). Nodes that are not included in the information-acquired elements are extracted from the nodes constituting the element.

  As described above, in this embodiment, in step S106 and step S107 corresponding to the element extraction procedure, attention is paid to the element that is the information acquisition target element, and the performance evaluation information is acquired based on the focused element. That is, elements that are present in the extending direction of the carcass 2 and for which performance evaluation information is acquired are sequentially extracted. First, a method for sequentially extracting elements from which performance evaluation information is acquired when elements constituting the carcass 2 are line elements composed of two nodes will be described.

  FIG. 8 shows an example in which the carcass 2 is formed by line elements composed of two nodes. Here, it is assumed that the new information acquisition target element set in step S109 is a focused element (hereinafter referred to as a focused element) 10En. The target element 10En is an element for which performance evaluation information has not yet been acquired. One of the two elements 10En-1, 10En + 1 adjacent to the target element 10En is an information acquired element, and the other is performance evaluation information. That is, an element that does not acquire information. In the example shown in FIG. 8, the element 10En + 1 is an information unacquired element.

  Of the two nodes 11Nn and 11Nn + 1 constituting the target element 10En, the node included in the element 10En-1 that is the information-acquired element is the node 11Nn. Therefore, among the nodes constituting the element of interest 10En, the node not included in the element 10En-1 that is the information-acquired element is the node 11Nn + 1. In step S106, the element extraction unit 53 extracts the node 11Nn + 1 of the element of interest 10En as a common node and stores it in the storage unit 50m.

  The adjacent element extracted in step S107 is an element that shares the node 11Nn + 1 that is not included in the element 10En-1 that is the information acquired element with the element of interest (that is, the information acquisition target element) 10En. When there are a plurality of line elements composed of two nodes, if one node of a certain line element is specified, another line element sharing the node with the line element can be specified. Therefore, if the node 11Nn + 1 that is not included in the element 10En-1 that is the information-acquired element is specified among the nodes 11Nn and 11Nn + 1 of the element of interest 10En, the element that shares the node 11Nn + 1 is specified as the element 10En + 1. That is, the element 10En + 1 is an adjacent element extracted in step S107. In step S107, the element extraction unit 53 extracts the element 10En + 1 as an adjacent element and stores it in the storage unit 50m. Next, the case where the element which comprises carcass 2 is a surface element (solid element) comprised by 4 nodes is demonstrated.

  FIG. 9 shows an example in which the carcass 2 is formed by plane elements composed of four nodes. Here, the new information acquisition target element set in step S109 is set as the target element 10En. The target element 10En is an element for which performance evaluation information has not yet been acquired. One of the two elements 10En-1, 10En + 1 adjacent to the target element 10En is an information acquired element, and the other is performance evaluation information. That is, an element that does not acquire information. In the example shown in FIG. 9, the element 10En + 1 is an information unacquired element.

  The target element 10En includes four nodes 11NAn, 11NBn, 11NAn + 1, 11NBn + 1, and four sides 12n, 12n + 1, 12n + 2, 12n + 3. Of the four sides 12n, 12n + 1, 12n + 2, and 12n + 3 constituting the target element 10En, the surface included in the element 10En-1 that is the information-acquired element is the side 12n. The nodes constituting the side 12n are the nodes 11NAn and 11NBn. Here, of the four sides 12n, 12n + 1, 12n + 2, and 12n + 3 that constitute the element 10En of interest, the sides that do not include the nodes 11NAn and 11NBn that constitute the side 12n included in the element 10En-1 that is the information-acquired element , Side 12n + 1.

  In step S106, of the four sides 12n, 12n + 1, 12n + 2, and 12n + 3 that constitute the element of interest 10En, the nodes 11NAn and 11NBn that constitute the side 12n included in the element 10En-1 that is the information-acquired element are not included. Nodes 11NAn + 1 and 11NBn + 1 constituting the side 12n + 1 are extracted as common nodes. This is the same as extracting the nodes 11NAn + 1 and 11NBn + 1 that are not included in the element 10En-1 that is the information-acquired element among the four nodes 11NAn, 11NBn, 11NAn + 1, and 11NBn + 1 constituting the target element 10En as common nodes. That is. In step S106, the element extraction unit 53 extracts the nodes 11NAn + 1 and 11NBn + 1 constituting the side 12n + 1 of the element of interest 10En as common nodes and stores them in the storage unit 50m.

  The adjacent elements extracted in step S107 are elements having the nodes 11NAn + 1 and 11NBn + 1 that constitute the side 12n + 1 that does not include the node 11NAn and 11NBn that constitute the side 12n included in the element 10En-1 that is the information-acquired element. That is, the adjacent elements extracted in step S107 are elements that share the nodes 11NAn + 1 and 11NBn + 1 not included in the element 10En-1 that is the information acquired element with the element of interest (that is, the information acquisition target element) 10En.

  When there are a plurality of surface elements composed of four nodes, if one side of a certain surface element and two nodes constituting the side are specified, the side and the two elements constituting the side are defined. Other surface elements that share a node with a given surface element can be identified. Therefore, if the nodes 11NAn + 1 and 11NBn + 1 constituting the sides 12n + 1 and 12n + 1 that are not included in the element 10En-1 that is the information-acquired element among the sides 12n and 12n + 1 of the target element 10En are specified, the sides 12n + 1 and 12n + 1 An element sharing the nodes 11NAn + 1 and 11NBn + 1 constituting the node is specified as an element 10En + 1. That is, the element 10En + 1 is an adjacent element extracted in step S107. In step S107, the element extraction unit 53 extracts the element 10En + 1 as an adjacent element and stores it in the storage unit 50m. Next, the case where the element which comprises the carcass 2 is a hexahedron element comprised by 8 nodes is demonstrated.

  FIG. 10 shows an example in which the carcass 2 is formed by hexahedral elements each having eight nodes. Here, the new information acquisition target element set in step S109 is set as the target element 10En. The target element 10En is an element for which performance evaluation information has not yet been acquired. One of the two elements 10En-1, 10En + 1 adjacent to the target element 10En is an information acquired element, and the other is performance evaluation information. That is, an element that does not acquire information. In the example shown in FIG. 10, the element 10En + 1 is an information unacquired element.

  The target element 10En includes eight nodes 11NAn, 11NBn, 11NCn, 11NDn, 11NAn + 1, 11NBn + 1, 11NCn + 1, 11NDn + 1, and six surfaces including the surfaces 12n, 12n + 1. Of the six surfaces constituting the target element 10En, the surface included in the element 10En-1 that is the information-acquired element is the surface 12n. The nodes constituting the surface 12n are the nodes 11NAn, 11NBn, 11NCn, and 11NDn. Here, of the six surfaces constituting the target element 10En, the surface not including the nodes 11NAn, 11NBn, 11NCn, and 11NDn constituting the surface 12n included in the element 10En-1 that is the information-acquired element is the surface 12n + 1. It is.

  In step S106, the surface 12n + 1 that does not include the nodes 11NAn, 11NBn, 11NCn, and 11NDn that configure the surface 12n included in the element 10En-1 that is the information-acquired element among the six surfaces that configure the target element 10En. The constituting nodes 11NAn + 1, 11NBn + 1, 11NCn + 1, 11NDn + 1 are extracted as common nodes. This is the same as extracting the nodes 11NAn + 1, 11NBn + 1, 11NCn + 1, and 11NDn + 1 that are not included in the element 10En-1 that is the information-acquired element among the eight nodes constituting the element of interest 10En as common nodes. . In step S106, the element extraction unit 53 extracts the nodes 11NAn + 1, 11NBn + 1, 11NCn + 1, and 11NDn + 1 constituting the surface 12n + 1 of the element of interest 10En as common nodes and stores them in the storage unit 50m.

  The adjacent elements extracted in step S107 are the nodes 11NAn + 1, 11NBn + 1, 11NCn + 1 that constitute the surface 12n + 1 that does not include the nodes 11NAn, 11NBn, 11NCn, and 11NDn that constitute the surface 12n included in the element 10En-1 that is the information-acquired element. , 11NDn + 1. That is, the adjacent elements extracted in step S107 are elements that share the nodes 11NAn + 1, 11NBn + 1, 11NCn + 1, and 11NDn + 1 that are not included in the element 10En-1 that is the information acquired element with the element of interest (that is, the information acquisition target element) 10En. is there.

  When there are a plurality of hexahedron elements composed of eight nodes, if one face of a hexahedron element and four nodes constituting the face are specified, the face and the face constituting the face 4 Other hexahedron elements that share one node with the previously described hexahedron element can be identified. Therefore, if the nodes 11NAn + 1, 11NBn + 1, 11NCn + 1, 11NDn + 1 constituting the surface 12n + 1 and the surface 12n + 1 not included in the element 10En-1 that is the information-acquired element among the six surfaces of the target element 10En are specified, the surface The element sharing the nodes 11NAn + 1, 11NBn + 1, 11NCn + 1, and 11NDn + 1 constituting 12n + 1 and the surface 12n + 1 is specified as the element 10En + 1. That is, the element 10En + 1 is an adjacent element extracted in step S107. In step S107, the element extraction unit 53 extracts the element 10En + 1 as an adjacent element and stores it in the storage unit 50m. Next, the case where the element which comprises the carcass 2 is a surface element comprised by 3 nodes is demonstrated.

  FIG. 11 is a schematic diagram showing another method for extracting an element for acquiring information for evaluating the performance of the tire. FIG. 11 shows an example in which the carcass 2 is formed by plane elements (solid elements) composed of three nodes. Here, the new information acquisition target element set in step S109 is set as the target element 10En. The target element 10En includes three nodes 11Nn, 11Nn + 1, and 11Nn + 2, and three surfaces 12n, 12n + 1, and 12n + 2.

  The attention element 10En is an element for which performance evaluation information has not yet been acquired. Of the three elements sharing the surface adjacent to the target element 10En, one of the elements 10En-1 and 10En + 1 is an information-acquired element, and the other is an element from which performance evaluation information is acquired, that is, no information is acquired. Is an element. In the example shown in FIG. 11, the element 10En + 1 is an information unacquired node. In addition, among the three elements sharing the surface adjacent to the target element 10En, the element 10Em is an element that does not constitute the carcass 2, and the performance evaluation information is not acquired. The target element 10En and the element 10En + 1 share the surface 12n + 1, and the target element 10En and the element 10Em share the surface 12n + 2.

  Of the three nodes 11Nn, 11Nn + 1, and 11Nn + 2 constituting the element of interest 10En, the nodes included in the element 10En-1 that is the information-acquired element are nodes 11Nn and 11Nn + 1. Therefore, among the nodes constituting the target element 10En, the node not included in the element 10En-1 that is the information-acquired element is the node 11Nn + 2. Elements that are information-unacquired elements and share the node 11Nn + 2 of the target element 10En and share the surface with the target element 10En are the element 10En + 1 and the element 10Em. As described above, when the element constituting the carcass 2 is a plane element constituted by three nodes, two elements that share the node 11Nn + 2 that is not included in the element 10En-1 that is the information-acquired element with the element 10En of interest are two. Are present (element 10En + 1 and element 10Em).

  In addition, the surface 12n + 1 shared by the element 10En + 1 with the element of interest 10En has one node 11Nn + 2 not included in the element 10En-1 that is an information acquired element, but the other node 11Nn + 1 is an element 10En- that is an information acquired element. 1 included. Similarly, the surface 12n + 2 that the element 10Em shares with the element of interest 10En is not included in the element 10En-1 that is the information acquired element of one node 11Nn + 2, but the element 10En that is the information acquired element of the other node 11Nn. -1. In this way, the surface is configured in the elements 10En + 1 and 10Em that are information unacquired elements that share the surface with the target element 10En and share the nodes not included in the information acquired element 10En-1 with the target element 10En. The nodes have the same relationship between the information acquired element 10En-1 and the target element 10En. Therefore, when the element constituting the carcass 2 is a surface element composed of three nodes, only the relationship with the node included in the information-acquired element 10En-1 or the relationship with the surface common to the element of interest 10En is used. The common node cannot be extracted.

  On the other hand, the element 10En + 1 that is an information unacquired element that shares a face with the element of interest 10En and shares a node that is not included in the information acquired element 10En-1 with the element of interest 10En constitutes the carcass 2, but information is not yet obtained. The element 10Em that is the acquisition element does not constitute the carcass 2. For this reason, for example, when creating the tire model 10 in step S101, by giving common identification information to a plurality of elements constituting the carcass 2 and grouping them, the elements constituting the carcass 2 and other elements Make sure that the element can be identified. Thereby, the elements constituting the carcass 2 from the elements 10En + 1 and 10Em which are the information non-acquisition elements sharing the surface with the attention element 10En and sharing the nodes not included in the information acquired element 10En-1 with the attention element 10En. 10En + 1 can be extracted.

  For example, K is given as identification information GP to the elements 10En-1, 10En, 10En + 1 constituting the carcass 2, and G is given as identification information GP to the element 10Em not constituting the carcass 2. As in the example illustrated in FIG. 11, when there are a plurality of information-unacquired elements that share the node 11Nn + 2 of the element of interest 10En and share a surface with the element of interest 10En (element 10En + 1 and element 10Em), the identification information GP = K If the elements are extracted, only the elements constituting the carcass 2 can be extracted in the order arranged in the extending direction of the carcass 2.

  If the element constituting the carcass 2 is a plane element composed of three nodes, in step S106, the element extraction unit 53 extracts the node 11Nn + 2 of the element of interest 10En as a common node and stores it in the storage unit 50m. The node 11Nn + 2 extracted as the common node is a node that is not included in the element 10En-1 that is the information-acquired element. In step S107, the element extraction unit 53 includes the node 11Nn + 2 that is a node not included in the element 10En-1 that is the information-acquired element, and adjacent to the element having the identification information GP of K, that is, the element 10En + 1. Extracted as an element and stored in the storage unit 50m. By such a method, when the element which comprises the carcass 2 is a surface element comprised by 3 nodes, the adjacent element of the attention element 10En can be extracted.

  In addition, when the carcass 2 is configured so that a plurality of pentahedron elements configured by six nodes are combined with a triangle in a two-dimensional shape, the elements configuring the carcass 2 are configured by three nodes As in the case of the elements, the elements constituting the carcass 2 and the other elements can be identified by giving common identification information to a plurality of elements constituting the carcass 2 and grouping them. As a result, even when the carcass 2 is constituted by a plurality of pentahedral elements each having six nodes, only the elements constituting the carcass 2 can be extracted in the order arranged in the extending direction of the carcass 2.

  When the adjacent element 10En + 1 is extracted in step S107, in step S108 corresponding to the information acquisition procedure, the performance evaluation information acquisition unit 54 acquires and stores the performance evaluation information of the target element 10En that is the information acquisition target element. Stored in the unit 50m. Then, the model creation unit 51 changes the target element 10En after acquiring the performance evaluation information to an information acquired element for which information has already been acquired, and stores this information in the storage unit 50m.

  Next, the process proceeds to step S109 corresponding to the target element changing procedure, and the model creation unit 51 sets the element 10En + 1 that is the adjacent element extracted in step S107 as a new information acquisition target element, and stores this information in the storage unit. Store to 50m. And it progresses to step S110 and the condition determination part 55 with which the process part 50p of the tire performance evaluation apparatus 50 is provided determines whether the conditions which complete | finish acquisition of performance evaluation information are satisfy | filled. As described above, step S106 to step S110, that is, the element extraction procedure, the information acquisition procedure, and the target element change procedure are repeated until the condition for ending the acquisition of performance evaluation information is satisfied.

  If it is determined Yes in step S110, that is, if the condition determination unit 55 determines that the condition for ending acquisition of performance evaluation information is satisfied, the process proceeds to step S111. In step S111, the data array changing unit 56 included in the processing unit 50p of the tire performance evaluation device 50 acquires a plurality of performance evaluation information extracted during steps S103 to S109 and stored in the storage unit 50m. Arrange in order. Thereby, the performance evaluation information of each element can be arranged in the arrangement order of the elements arranged in the extending direction of the carcass 2.

  FIG. 12A is a diagram illustrating an example of a result of extracting the tension from the elements constituting the tire model. FIG. 12-2 is a diagram illustrating an example of a result obtained by rearranging the tensions of the elements constituting the carcass in the arrangement order from the tensions of the elements constituting the tire model. FIG. 13 is a distribution diagram of tension in the extending direction of the carcass.

  12A and 12B, ID_EL is an element number, Ft is a tension that is one piece of performance evaluation information, and GP is element identification information. When the identification information GP is K, it means that it is an element that constitutes the carcass 2. When the identification information GP is B, it means that it is an element that constitutes a belt, and the identification information GP is G. In this case, it means that it is an element constituting rubber disposed between the reinforcing layers such as the carcass 2 and the belt. FIG. 13 shows a carcass tension distribution in a case where a tire having a tire size of 195 / 60R15 is modeled as an analysis model and a pressure of 210 kPa is simulated.

  FIG. 12A is a diagram in which the tension Ft of each element constituting the tire model 10 is extracted and arranged in the element number (ID_EL) order after the analysis in step S102 is completed. The element number of the element whose identification information GP in FIG. 12-1 is K, that is, the element constituting the carcass corresponds to the element number of the carcass 2 shown in FIG. As shown in FIGS. 12A and 12A, the tensions Ft constituting the tire model 10 are not necessarily extracted in the order of arrangement of the elements constituting the carcass 2. When the distribution diagram of the tension Ft is drawn in the state extracted in FIG. 12A, the tension Ft may be irregularly arranged with respect to the position of the carcass 2. It is necessary to rearrange Ft to create a distribution map of the tension Ft in the extending direction of the carcass 2 as shown in FIG.

  12B is a diagram in which the tension Ft shown in FIG. 12A is rearranged in the order of the elements constituting the carcass 2 by using the data arrangement changing method according to the present embodiment. The data arrangement changing method according to the present embodiment is automatically processed by causing a computer to execute a computer program describing this processing procedure.

  Up to now, the tension Ft shown in FIG. 12-1 is rearranged in the order of the elements constituting the carcass 2 by manual operation by an operator, and it takes about 1 to 3 hours for each two carcasses. It was. However, according to the present embodiment, the computer program (the tire performance evaluation device 50 in the present embodiment) that executes the computer program describing the processing procedure of the data arrangement changing method according to the present embodiment is arranged. The time required for the replacement is about 10 seconds including the designation of the structure to be rearranged. Thus, according to the present embodiment, the working time can be significantly reduced and the work load can be reduced as compared with the conventional method of changing the data arrangement. Further, the distribution diagram of the tension Ft obtained by rearranging the tension Ft according to the present embodiment is as shown in FIG. 13, where the tread portion (ΔY1), the sidewall portion (ΔY2), the bead portion (ΔY3), and the turn A correct value is described in each of the up portions (ΔY4).

  As described above, in this embodiment, in the analysis model of the structure after the simulation, that is, the analysis is completed, the nodes that are not included in the information acquired element among the nodes constituting the information acquisition target element from which performance evaluation information is to be acquired By extracting adjacent elements that share the same, the physical quantities of the elements constituting the structure are arranged in the order of arrangement of the plurality of elements constituting the structure whose performance is to be evaluated. Thereby, the physical quantity can be automatically arranged by the computer in the arrangement order of the plurality of elements constituting the structure whose performance is to be evaluated. As a result, in the simulation of the structure using a computer, it is possible to reduce time and labor when rearranging the data obtained by the simulation.

  The data array changing method according to the present embodiment can be applied to an interface element such as an adhesive interface and an element constituting the surface of a structure. In particular, in the tire simulation, since the carcass is folded at the bead portion, the arrangement order of the elements constituting the carcass in the extending direction of the carcass and the order of extracting the physical quantities of the elements constituting the carcass tend not to match. Is strong. Therefore, the data array changing method according to the present embodiment is particularly suitable for a structure having a turn, such as a carcass.

  As described above, the data arrangement changing method and the data arrangement changing computer program according to the present invention are useful for the simulation of a structure using a computer, and in particular, the trouble in rearranging the data obtained by the simulation. Suitable for reducing.

It is sectional drawing which shows the meridian cross section of a tire. FIG. 3 is a schematic diagram in which a tire carcass is analytically modeled with a line element composed of a plurality of nodes. It is a figure which shows the tension | tensile_strength of the node which comprises the analysis model of the carcass shown in FIGS. It is a figure which shows the tension | tensile_strength of the node which comprises the analysis model of the carcass shown in FIGS. It is explanatory drawing which shows the structure of the tire performance evaluation apparatus which concerns on a present Example. It is a flowchart which shows the procedure of the data arrangement change method which concerns on a present Example. It is a perspective view showing the whole tire model. FIG. 6 is a partial cross-sectional view showing a part of the meridian cross section of the tire model shown in FIG. 5. FIG. 6 is a partial cross-sectional view showing a part of the meridian cross section of the tire model shown in FIG. 5. It is a schematic diagram which shows the method of extracting the element which acquires the information for evaluating the performance of a tire. It is a schematic diagram which shows the method of extracting the element which acquires the information for evaluating the performance of a tire. It is a schematic diagram which shows the method of extracting the element which acquires the information for evaluating the performance of a tire. It is a schematic diagram which shows the other method of extracting the element which acquires the information for evaluating the performance of a tire. It is a figure which shows an example of the result of having extracted tension | tensile_strength from the element which comprises a tire model. It is a figure which shows an example of the result of having rearranged the tension | tensile_strength of the element which comprises a carcass from the tension | tensile_strength of the element which comprises a tire model in arrangement order. It is a distribution map of tension in the extending direction of the carcass.

Explanation of symbols

1 tire 2 carcass 3 belt 4 belt cover 5 bead core 10 tire model 10En, 10Em element (attention element)
10En-1 information acquired element 11N node 11Nn node 12n side (surface)
DESCRIPTION OF SYMBOLS 50 Tire performance evaluation apparatus 50p Processing part 50m Storage part 51 Model preparation part 52 Analysis part 53 Element extraction part 54 Performance evaluation information acquisition part 55 Condition determination part 56 Data arrangement change part

Claims (8)

Computer
An analysis model creation procedure for creating an analysis model that can be analyzed by a computer by dividing the structure to be evaluated into a plurality of elements composed of a plurality of nodes,
Analyzing the created analysis model, and obtaining physical quantities of the plurality of elements;
An element setting procedure for setting an information acquisition target element, which is a target for acquiring performance evaluation information for evaluating the performance of the structure, from a plurality of the elements;
Among the nodes constituting the information acquisition target element, an element extraction procedure for extracting adjacent elements that share nodes that are not included in the information acquired element that has already acquired the performance evaluation information;
An information acquisition procedure for acquiring the performance evaluation information from the information acquisition target element and setting the information acquisition target element after acquiring the performance evaluation information as the information acquired element;
A target element change procedure for setting the adjacent element as a new information acquisition target element;
Hints, and the element extraction procedure, and the information acquisition procedure is repeated and the target element changing procedure until a predetermined end condition, the plurality of the performance evaluation information extracted, performing arranging the obtained order data sequence alteration method comprising.   2. The method according to claim 1, further comprising a starting element setting procedure for setting a starting element for starting extraction of the performance evaluation information from a plurality of elements and extracting performance evaluation information of the starting element. 2. The data arrangement changing method according to 1. If the element is constituted by two nodes, Te said element extraction procedure smell, the computer,
Among the nodes constituting the information acquisition target element, an adjacent element sharing a point that does not include a node included in the information acquired element that is the element that has already acquired the performance evaluation information is extracted. The data array changing method according to claim 1 or 2. If the element consists of a 4-node or 8-node, Te said element extraction procedure smell, the computer,
Extracting adjacent elements that share a surface that does not include a node that constitutes a surface included in an information acquired element that is the element that has already acquired the performance evaluation information from among the nodes that configure the information acquisition target element The data arrangement changing method according to claim 1, wherein the data arrangement is changed.   The data array changing method according to claim 1, wherein the elements from which the performance evaluation information is acquired are the same type of material. The data array changing method according to claim 1, wherein when the adjacent element is not extracted in the element extraction procedure, the computer ends the repetition.   The data structure changing method according to any one of claims 1 to 6, wherein the structure is a tire, and the information acquisition target element corresponds to a cord material of the tire.   A computer program for changing data arrangement, which causes a computer to execute the data arrangement changing method according to any one of claims 1 to 7.

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