Analysis device, analysis method, and program

Abstract

To provide an analysis device capable of improving the accuracy of cross-sectional design values ​​related to the target cross-section. [Solution] The analysis device comprises a first setting unit, a second setting unit, a first derivation unit, and a second derivation unit. The first setting unit divides the target cross section enclosed by the boundary edge 801 into a plurality of sections 81. The second setting unit defines a plurality of calculation regions 82, each composed of some of the plurality of sections 81. The first derivation unit derives the overall sectional force of the target cross section. The second derivation unit derives the sectional characteristic values ​​of each of the plurality of calculation regions 82. The plurality of sections 81 include a first section 811 and a second section 812. The plurality of calculation regions 82 include a plurality of first calculation regions 82A, each composed of the first section 811. The first calculation region 82A includes a first region 821 that does not include the second section 812 and a second region 822 that includes the second section 812.

Description

Technical Field

[0001] The present invention relates to an analysis apparatus, an analysis method, and a program related to numerical analysis.

Background Art

[0002] CAE (Computer Aided Engineering) is known as a tool for assisting in the design of various members that make up machines, transportation equipment, and the like. The finite element method, which is one of the numerical analysis methods for various members, is an example of a typical component of CAE. Patent Document 1 discloses an assistance method for numerically analyzing various members by the finite element method. According to this assistance method, it is possible to automatically generate analysis data related to the nodes and identification information constituting the mesh in the divided cross section of various members. Thereby, it is possible to reduce the work hours and suppress the occurrence of work mistakes when numerically analyzing various members.

[0003] However, even with the assistance method disclosed in Patent Document 1, when the divided cross section does not include some meshes, those meshes are not subject to numerical analysis. This is due to a decrease in the accuracy of the cross-sectional design values obtained by numerical analysis.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] An object of the present invention is to provide an analysis apparatus capable of improving the accuracy of cross-sectional design values related to a target cross section.

Means for Solving the Problems

[0006] An analysis apparatus provided by a first aspect of the present invention comprises a first setting unit, a second setting unit, a first derivation unit, and a second derivation unit. The first setting unit divides a target cross section enclosed by boundary edges into a plurality of sections. The second setting unit defines a plurality of calculation regions, each comprising some of the plurality of sections. The first derivation unit derives the overall sectional forces of the target cross section. The second derivation unit derives the sectional characteristic values ​​of each of the plurality of calculation regions. The plurality of sections includes a first section and a second section adjacent to the first section. The plurality of calculation regions include a plurality of first calculation regions, each comprising the first section. The plurality of first calculation regions include a first region that does not comprise the second section and a second region that comprises the second section.

[0007] Preferably in the implementation of the present invention, the first section is adjacent to the boundary edge. The number of sections constituting the first region is less than the number of sections constituting the second region.

[0008] An analysis method provided by a second aspect of the present invention is a computer-based analysis method comprising a first step, a second step, a third step, and a fourth step. In the first step, a target cross section enclosed by boundary edges is divided into a plurality of sections. In the second step, a plurality of calculation regions are defined, each comprising some of the plurality of sections. In the third step, the overall sectional forces of the target cross section are derived. In the fourth step, the sectional characteristic values ​​of each of the plurality of calculation regions are derived. The plurality of sections include a first section and a second section adjacent to the first section. The plurality of calculation regions include a plurality of first calculation regions, each comprising the first section. The plurality of first calculation regions include a first region that does not comprise the second section and a second region that comprises the second section.

[0009] Preferably in the implementation of the present invention, the first section is adjacent to the boundary edge. The number of sections constituting the first region is less than the number of sections constituting the second region.

[0010] The program provided by the third aspect of the present invention causes a computer to function as an analysis device provided by the first aspect of the present invention. [Effects of the Invention]

[0011] The configuration of the analysis device 10 according to the present invention makes it possible to improve the accuracy of the cross-sectional design values ​​related to the target cross-section.

[0012] Other features and advantages of the present invention will become more apparent from the detailed description below, based on the accompanying drawings. [Brief explanation of the drawing]

[0013] [Figure 1] This is a functional block diagram showing the configuration of an analysis system equipped with an analysis device according to one embodiment of the present invention. [Figure 2] Figure 1 is a plan view of the target cross-section that the analysis system is targeting. [Figure 3] This is a plan view illustrating the processing in the first setting unit of the analysis device shown in Figure 1. [Figure 4] Figure 1 is a perspective view illustrating the method for defining multiple first calculation domains in the second setting unit of the analysis device shown in Figure 1, based on the first case. [Figure 5] Figure 1 is a perspective view illustrating the method for defining multiple first calculation domains in the second setting section of the analysis device shown in Figure 1, according to the second case. [Figure 6] Figure 1 is a perspective view illustrating the method for defining multiple first calculation domains in the third case of the processing in the second setting unit of the analysis device shown in Figure 1. [Figure 7] Figure 1 is a perspective view illustrating the method for defining multiple second calculation domains in the second setting unit of the analysis device shown in Figure 1. [Figure 8] Figure 1 shows an example of a flowchart illustrating the processing procedure of the analysis device. [Modes for carrying out the invention]

[0014] A mode for implementing the present invention will be described based on the accompanying drawings.

[0015] Based on FIGS. 1 to 7, an analysis system A10 according to an embodiment of the present invention will be described. The analysis system A10 includes an analysis device 10, a storage unit 20, an operation unit 30, and a display unit 40.

[0016] In the description of the analysis device 10, for convenience, the direction in which the first edge 801A of the boundary edge 801 described later extends is referred to as the "first direction x". The direction orthogonal to the first direction x is referred to as the "second direction y". The direction orthogonal to both the first direction x and the second direction y is referred to as the "third direction z".

[0017] The analysis device 10 derives a sectional force, sectional characteristic values, and sectional design values related to the target cross-section 80. As shown in FIG. 2, the target cross-section 80 is an element surrounded by a boundary edge 801. The target cross-section 80 includes a member cross-section 80A set from various members constituting various machines and transportation equipment, etc., and a blank cross-section 80B adjacent to the member cross-section 80A. The blank cross-section 80B is not included in the elements of various members. Therefore, both the sectional force and the sectional characteristic values in the blank cross-section 80B are 0. The boundary edge 801 in the analysis device 10 is square. In addition, the boundary edge 801 can take any of a rectangular shape including a rectangular shape, a circular shape, and an elliptical shape.

[0018] The analysis device 10 is a computer installed with a program according to the present invention. The program is downloaded from a server via a network line such as an Internet line and then stored in the storage unit 20. Or, the program may be installed from a recording medium such as a DVD-ROM. In addition, the program may be an element of a program constituting CAD. Further, the analysis device 10 includes a CPU, a ROM, a RAM, an image processing processor, etc. as hardware.

[0019] As shown in FIG. 1, the analysis device 10 includes a setting unit 11, a derivation unit 12, and an output unit 13.

[0020] In the setting unit 11, based on the target cross-section 80 shown in FIG. 2, a plurality of calculation regions 82 shown in FIGS. 4 to 7 are defined. As shown in FIG. 1, the setting unit 11 includes a first setting unit 111 and a second setting unit 112.

[0021] In the first setting unit 111, as shown in FIG. 3, the target cross-section 80 is divided into a plurality of sections 81. Here, among the boundary edges 801, the edge extending along the first direction x is referred to as the "first edge 801A". Among the boundary edges 801, the edge extending along the second direction y and connected to the first edge 801A is referred to as the "second edge 801B". In the analysis device 10, each of the plurality of sections 81 is square. In addition, each of the plurality of sections 81 can adopt a rectangular shape including a rectangular shape, a circular shape, an elliptical shape, a triangular shape, a parallelogram shape, etc. Therefore, the shape of each of the plurality of sections 81 can be freely set as long as it can divide the target cross-section 80. Each element of the plurality of sections 81 includes at least a part of either the member cross-section 80A or the blank cross-section 80B. As shown in FIG. 3, the plurality of sections 81 includes a first section 811 and a second section 812. The second section 812 is adjacent to the first section 811 in the first direction x.

[0022] In the second setting unit 112, as shown in FIGS. 4 to 7, a plurality of calculation regions 82 are defined. Each of the plurality of calculation regions 82 has some of the plurality of sections 81 defined by the first setting unit 111 as constituent elements. The plurality of calculation regions 82 each include a plurality of first calculation regions 82A each having the first section 811 as a constituent element. That is, the plurality of first calculation regions 82A is a region group corresponding to the first section 811. Further, the plurality of calculation regions 82 each include a plurality of second calculation regions 82B each having the second section 812 as a constituent element. That is, the plurality of second calculation regions 82B is a region group corresponding to the second section 812. Therefore, the plurality of calculation regions 82 includes a region group (such as the first calculation region 82A and the second calculation region 82B) corresponding to each of the plurality of sections 81. [[ID=】]

[0023] First, based on Figures 4 to 6, the method for defining the multiple first calculation regions 82A among the multiple calculation regions 82 will be explained. The multiple first calculation regions 82A include four regions: the first region 821, the second region 822, the third region 823, and the fourth region 824. However, the number of regions included in the multiple first calculation regions 82A is not limited to two or more. Viewed in the third direction z, each of the first region 821, the second region 822, the third region 823, and the fourth region 824 overlaps with each other at least in the entirety of the first section 811.

[0024] There are three methods for defining multiple first calculation areas 82A: Case 1 C1, Case 2 C2, and Case 3 C3. Each of these three cases will be explained below.

[0025] <Case 1 C1> Case 1 C1 will be explained based on Figure 4. Case 1 C1 is the case where the first section 811 is separated from the boundary edge 801. As shown in Figure 4, each of the first region 821 and the fourth region 824 has the first section 811 as a component, but does not have the second section 812 as a component. Each of the second region 822 and the third region 823 has the first section 811 and the second section 812 as components. Each of the first region 821, the second region 822, the third region 823, and the fourth region 824 has four sections as components, including the first section 811. Therefore, in Case 1 C1, the number of multiple sections 81 that make up each of the first region 821, the second region 822, the third region 823, and the fourth region 824 is the same.

[0026] <Case 2 C2> Case 2 C2 will be explained based on Figure 5. Case 2 C2 is the case where the first section 811 is adjacent to the first edge 801A and away from the second edge 801B. As shown in Figure 5, each of the first region 821 and the third region 823 has the first section 811 as a component, but does not have the second section 812 as a component. Each of the second region 822 and the fourth region 824 has the first section 811 and the second section 812 as components. Each of the first region 821 and the fourth region 824 has two sections as components, both including the first section 811. Each of the second region 822 and the third region 823 has four sections as components, both including the first section 811. Therefore, in the second case C2, the number of partitions 81 constituting each of the first region 821 and the fourth region 824 is smaller than the number of partitions 81 constituting each of the second region 822 and the third region 823.

[0027] <Case 3 C3> Case 3, C3, will be explained based on Figure 6. Case 3, C3, is the case where the first section 811 is adjacent to both the first edge 801A and the second edge 801B. As shown in Figure 6, each of the first region 821 and the third region 823 has the first section 811 as a component, but not the second section 812. Each of the second region 822 and the fourth region 824 has the first section 811 and the second section 812 as components. The first region 821 has only the first section 811 as a component. Each of the second region 822 and the third region 823 has two sections as components, both including the first section 811. The fourth region 824 has four sections as components, including the first section 811. Therefore, in the third case C3, the number of partitions 81 constituting the first region 821 is less than the number of partitions 81 constituting the second region 822 and the third region 823, respectively. The number of partitions 81 constituting the second region 822 and the third region 823, respectively, is less than the number of partitions 81 constituting the fourth region 824.

[0028] Next, based on Figure 7, the method for defining multiple second calculation areas 82B among the multiple calculation areas 82 will be explained. In explaining the method for defining multiple second calculation areas 82B, the case in which multiple first calculation areas 82A are defined according to the third case C3 will be used as a representative example. In this case, each second section 812, which is a component of the multiple second calculation areas 82B, is adjacent to the first edge 801A and away from the second edge 801B.

[0029] As shown in Figure 7, the multiple second calculation regions 82B include the second region 822, the fourth region 824, the fifth region 825, and the sixth region 826. Of these, the second region 822 and the fourth region 824 are identical to the second region 822 and the fourth region 824 included in the multiple first calculation regions 82A. The number of regions included in the multiple second calculation regions 82B is equal to the number of regions included in the multiple first calculation regions 82A. Viewed in the third direction z, each of the second region 822, the fourth region 824, the fifth region 825, and the sixth region 826 overlaps with each other in at least the entirety of the second section 812. Each of the fifth region 825 and the sixth region 826 has the second section 812 as a component, but does not have the first section 811 as a component. The fifth region 825 has two sections, including the second section 812, as its components. The sixth region 826 consists of four sections, including the second section 812. Therefore, the number of sections 81 that make up the second region 822 and the fifth region 825 is less than the number of sections 81 that make up the fourth region 824 and the sixth region 826.

[0030] In this way, by defining a region group for each of the multiple sections 81, in the target cross-section 80, when viewed in the third direction z, each of the multiple sections 81 overlaps with the other by multiple calculation regions 82 with an equal number of layers. In this embodiment, the number of layers is 4.

[0031] The derivation unit 12 calculates the overall sectional force of the target cross section 80 and the sectional characteristic values ​​for each of the multiple calculation areas 82 defined in the setting unit 11, and then derives the sectional design values ​​for the target cross section 80. As shown in Figure 1, the derivation unit 12 includes a first derivation unit 121, a second derivation unit 122, and a third derivation unit 123.

[0032] In this embodiment, the case where the sectional design value for the target cross section 80 is the shared risk rate is considered. The shared risk rate is used to evaluate the safety of a member against vehicle collisions and the like. The shared risk rate is derived based on the formula shown in the following paragraph. Here, the axial force Fx, Y-axis moment My, and Z-axis moment Mz included in the derivation formula for the shared risk rate correspond to the total sectional forces of the target cross section 80. The fully plastic axial force PFx, Y-axis fully plastic moment PMy, and Z-axis fully plastic moment PMz included in the derivation formula for the shared risk rate correspond to the sectional characteristic values ​​for the target cross section 80. Here, the direction of the axial force Fx and the fully plastic axial force PFx are both in the direction of the X axis. The direction of the X axis corresponds to the "third direction z" shown in Figure 4, etc. Furthermore, the directions of the Y axis and Z axis shown in the formula in the following paragraph are orthogonal to the direction of the X axis. The direction of the Z axis is orthogonal to the direction of the Y axis.

[0033]

number

[0034] In the first derivation section 121, the total sectional forces of the target section 80 are derived. The sectional forces to be calculated are the axial force Fx, the Y-axis moment My, and the Z-axis moment Mz. Here, when the significance level is derived in the derivation section 12, the sectional forces of each of the multiple calculation regions 82 and the total sectional forces of the target section 80 are derived separately. When deriving the sectional forces of each of the multiple calculation regions 82, if the multiple second calculation regions 82B include the second region 822 as shown in the third case C3 above, care is taken to avoid duplicate derivation of the sectional forces of the second region 822, as this overlaps with the second region 822 included in the multiple first calculation regions 82A.

[0035] The second derivation unit 122 derives the cross-sectional property values ​​for each of the multiple calculation regions 82. The cross-sectional property values ​​to be calculated are the total plastic axial force PFx, the Y-axis total plastic moment PMy, and the Z-axis total plastic moment PMz, which apply to the entire set of multiple calculation regions 82. When deriving the cross-sectional property values ​​for each of the multiple calculation regions 82, if the multiple second calculation regions 82B include the second region 822, as in the third case C3 described above, care is taken to avoid duplicate derivation of the cross-sectional property values ​​for the second region 822, as this overlaps with the second region 822 included in the multiple first calculation regions 82A. Here, for the sake of explanation, the cross-sectional property values ​​for each of the multiple calculation regions 82 derived in the second derivation unit 122 are denoted as the total plastic axial force PFxn, the Y-axis total plastic moment PMyn, and the Z-axis total plastic moment PMzn, respectively. n is a natural number corresponding to the number of multiple calculation regions 82. For example, the cross-sectional property values ​​of the first region 821, which constitutes multiple calculation regions 82, are denoted as PFx1, PMy1, and PMz1, respectively. Similarly, the cross-sectional forces of the second region 822, which constitutes multiple calculation regions 82, are denoted as Fx2, My2, and Mz2, respectively.

[0036] In the third derivation section 123, the risk sharing ratio as a cross-sectional design value is derived from the calculated cross-sectional force values ​​obtained in the first derivation section 121 and the calculated cross-sectional characteristic values ​​obtained in the second derivation section 122.

[0037] First, the full plastic axial force PFxn, Y-axis full plastic moment PMyn, and Z-axis full plastic moment PMzn for each of the multiple calculation domains 82 are multiplied by a contribution ratio. The contribution ratio is the ratio of the sectional force in any of the multiple calculation domains 82 corresponding to a given sectional characteristic value to the total sectional force of the target cross section 80 corresponding to that sectional characteristic value. By applying the contribution ratio, the design of the target cross section 80 can be rationalized. In this case, the sectional force of each of the multiple calculation domains 82 is derived in the first derivation unit 121. However, depending on the type of sectional design value related to the target cross section 80, it may not be necessary to set a contribution ratio, so calculating the sectional force of each of the multiple calculation domains 82 is not mandatory.

[0038] For example, let Fx1, My1, and Mz1 be the sectional forces of the first region 821 that constitutes multiple calculation regions 82. In this case, the sectional characteristic values ​​PFx1', PMy1', and PMz1' of the first region 821 after multiplying by the distribution ratio are derived based on the formula shown in the next paragraph.

[0039]

number

[0040] Next, the total plastic axial force PFx, Y-axis total plastic moment PMny', and Z-axis total plastic moment PMnz' for each of the multiple calculation regions 82 multiplied by the sharing ratio are combined to derive the total plastic axial force PFx, Y-axis total plastic moment PMy, and Z-axis total plastic moment PMz for the entire multiple calculation regions 82. The explanation of these derivation methods is omitted.

[0041] Finally, the total axial force Fx, Y-axis moment My, and Z-axis moment Mz of the target section 80, and the total plastic axial force PFx, Y-axis total plastic moment PMy, and Z-axis total plastic moment PMz relating to the entirety of the multiple calculation regions 82 are substituted into the aforementioned formula for deriving the risk sharing rate. This gives the risk sharing rate relating to the target section 80. Here, in the target section 80, when viewed in the third direction z, the multiple calculation regions 82 overlap each of the multiple sections 81 with an equal number of layers (see Figures 4 to 7). Therefore, the total plastic axial force PFx, Y-axis total plastic moment PMy, and Z-axis total plastic moment PMz relating to the entirety of the multiple calculation regions 82 are obtained by multiplying the actual cross-sectional property value (the total cross-sectional property value of the target section 80) by the number of layers. Therefore, in deriving the risk sharing ratio, it is necessary to multiply each of the total axial force Fx, Y-axis moment My, and Z-axis moment Mz of the target cross-section 80, which corresponds to the numerator, by the number of layers. Thus, the constant m included in the derivation formula for the risk sharing ratio corresponds to the number of layers. The constant m is a natural number of 2 or greater. That is, in this embodiment, the risk sharing ratio is derived by setting the constant m to 4.

[0042] The output unit 13 outputs data relating to the section forces derived in the first derivation unit 121 of the derivation unit 12, the section characteristic values ​​calculated in the second derivation unit 122 of the derivation unit 12, and the section design values ​​derived in the third derivation unit 123 of the derivation unit 12.

[0043] The storage unit 20 stores various data and programs. The storage unit 20 is, for example, a hard disk drive. In the analysis system A10, the storage unit 20 stores programs related to the analysis system A10 and data acquired and generated by the analysis device 10. The storage unit 20 may be a hard disk drive incorporated into the analysis device 10, or it may be a database accessible by the computer on which the analysis device 10 is installed.

[0044] The operation unit 30 receives commands from the operator to run the analysis device 10. The operation unit 30 is equipped with operating means such as a keyboard, mouse, and touch panel. The operator inputs operation signals corresponding to the operating means into the operation unit 30. The analysis device 10 then processes the input operation signals.

[0045] The display unit 40 displays an image generated by the analysis device 10. The display unit 40 is equipped with a display device such as a liquid crystal display. An example of the image is a visualization of the bending stress distribution acting on the cross-section 80A of the member.

[0046] Next, the processing procedure of the analysis device 10 provided in the analysis system A10 will be explained based on Figure 8.

[0047] In the first step S11, the target cross section 80 surrounded by the boundary edge 801 is divided into multiple sections 81 (see Figure 3).

[0048] In the second step S12, multiple calculation areas 82 are defined, each comprising several of the multiple sections 81 (see Figures 4 to 7).

[0049] In the third step S13, the total sectional forces of the target cross-section 80 are derived.

[0050] In the fourth step S14, the cross-sectional property values ​​for each of the multiple calculation regions 82 are derived.

[0051] In the fifth step, S15, the section design values ​​for the target section 80 are derived. The section design values ​​are derived as appropriate based on the section forces derived in the third step, S13, and the section characteristic values ​​derived in the fourth step, S14.

[0052] Next, we will explain the effects and capabilities of the analysis device 10 provided in the analysis system A10.

[0053] The analysis device 10 comprises a first setting unit 111, a second setting unit 112, a first derivation unit 121, and a second derivation unit 122. The first setting unit 111 divides the target cross section 80 into a plurality of sections 81. The second setting unit 112 defines a plurality of calculation regions 82, each composed of some of the plurality of sections 81. The first derivation unit 121 derives the section forces. The second derivation unit 122 derives the section characteristic values. The plurality of sections 81 include a first section 811 and a second section 812. The plurality of calculation regions 82 include a plurality of first calculation regions 82A, each composed of the first section 811. The plurality of calculation regions 82 include a first region 821 that does not include the second section 812, and a second region 822 that includes the second section 812. By adopting this configuration, when setting a member cross-section 80A composed of multiple meshes for numerical analysis of the target cross-section 80, even if there are meshes that are not included in the first region 821, those meshes can be included in the second region 822. This improves the accuracy of the cross-sectional forces and cross-sectional characteristic values ​​related to the target cross-section 80. Therefore, with this configuration, the analysis device 10 can improve the accuracy of the cross-sectional design values ​​related to the target cross-section 80.

[0054] The first section 811 defined in the first setting section 111 is adjacent to the boundary edge 801. In this case, with respect to the first region 821 and the second region 822 defined in the second setting section 112, the number of sections 81 constituting the first region 821 is less than the number of sections 81 constituting the second region 822. By adopting this configuration, the first region 821 and the second region 822 can be defined so that each does not deviate from the boundary edge 801. This prevents elements that deviate from the boundary edge 801 from being included in the target cross section 80.

[0055] The present invention is not limited to the embodiments described above. The specific configuration of each part of the present invention can be modified in various ways.

[0056] The section forces, section characteristics values, and section design values ​​derived in the derivation section 12 of the analysis device 10 are not limited to the embodiments described above. Section forces include various loads and bending moments. Section characteristics values ​​include the full plastic axial force and full plastic moment described above, as well as the cross-sectional area, second moment of area, and section modulus. Section design values ​​include the aforementioned risk factor, as well as various stresses such as bending and shear, and various displacements such as deflection. [Explanation of Symbols]

[0057] A10: Analysis System 10: Analysis device 11: Settings Section 111,112: First setting section, second setting section 12: Derivation part 121.122,123: 1st derivation part, 2nd derivation part, 3rd derivation part 13: Output section 20: Storage part 30:Operation unit 40: Display section 80: Target cross section 80A: Cross-section of member 80B:Blank section 801: Boundary 801A, 801B: First edge, second edge 81: Section 811,812: Section 1, Section 2 82: Calculation area 82A, 82B: First calculation area, second calculation area 821~826: 1st area ~ 6th area S11~S15: Step 1~Step 5 C1, C2, C3: Case 1, Case 2, Case 3

Claims

1. A first setting unit divides the target cross-section enclosed by the boundary edge into multiple sections, A second setting unit defines multiple calculation areas, each of which consists of some of the aforementioned multiple sections, A first derivation unit for deriving the overall cross-sectional force of the target cross-section, The system includes a second derivation unit that derives the cross-sectional characteristic values ​​of each of the aforementioned plurality of calculation regions, The plurality of sections include a first section and a second section adjacent to the first section, The aforementioned plurality of calculation areas include a plurality of first calculation areas, each of which is composed of the first section. The analysis device comprises a plurality of first calculation regions, each including a first region that does not include the second section as a component, and a second region that includes the second section as a component.

2. The aforementioned first section is adjacent to the boundary edge, The analysis apparatus according to claim 1, wherein the number of the plurality of sections constituting the first region is less than the number of the plurality of sections constituting the second region.

3. A computer-based analysis method, The first step is to divide the target cross section enclosed by the boundary edge into multiple sections, A second step is to define multiple calculation areas, each of which consists of some of the aforementioned multiple sections, A third step involves deriving the overall sectional force of the target cross-section, The system comprises a fourth step of deriving the cross-sectional characteristic values ​​of each of the aforementioned multiple calculation regions, The plurality of sections include a first section and a second section adjacent to the first section, The aforementioned plurality of calculation areas include a plurality of first calculation areas, each of which is composed of the first section. The analysis method wherein the plurality of first calculation regions include a first region that does not consist of the second section and a second region that consists of the second section.

4. The aforementioned first section is adjacent to the boundary edge, The analysis method according to claim 3, wherein the number of the plurality of sections constituting the first region is less than the number of the plurality of sections constituting the second region.

5. A program that causes a computer to function as the analysis device described in claim 1 or 2.

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