JP6048006B2 - Method and apparatus for detecting optimum local reinforcement position of component constituting structure, and method for reinforcing component based on optimum local reinforcement position detection method - Google Patents

Description

  The present invention relates to an optimization analysis of a structure, and reinforces a component based on an optimum local reinforcement position detection method, apparatus, and optimum local reinforcement position detection method of a component constituting a structure such as an automobile body. It relates to method optimization.

  In recent years, especially in the automobile industry, optimization of vehicle bodies (improving rigidity and weight reduction) due to environmental problems has been promoted. For this reason, CAE (Computer Aided Engineering) analysis has become an indispensable technology for vehicle body design. ing. In this CAE analysis, the rigidity can be improved and the weight can be reduced by using optimization techniques such as mathematical optimization, plate thickness optimization, shape optimization, and topology optimization.

In addition, as a method for improving the rigidity of the vehicle body, there is a method in which a local reinforcing member (for example, a bulkhead or a reinforcement) that is installed locally on a component of the vehicle to reinforce the local region is installed on a component that constitutes the vehicle body ( For example, Patent Document 1).
Such a local reinforcing member greatly affects the rigidity of the part and the vehicle body incorporating the part depending on the installation position, and therefore, it is required to find the optimum reinforcing position.

  For this purpose, for example, the CAE analysis as described above is used to change the installation position of the local reinforcing member on the component, perform the rigidity analysis each time, and compare the obtained results for more appropriate reinforcement. The position can be found.

JP 2001-145099 A

  However, the method described above is trial and error, and by searching for the position that is most likely to contribute to the improvement of rigidity by applying local reinforcement on a certain part, each time There is a problem in that it takes a lot of work because an analysis model of a part in which a local reinforcing member is installed at a position must be created and analyzed.

Further, in order to install the local reinforcing member, a place of a certain size for installation is required. Therefore, it is not always possible to install local reinforcing members at all positions that are likely to contribute to rigidity.
Further, even if the local reinforcing member can be installed, there is a problem that an accurate result cannot be obtained depending on the shape of the local reinforcing member and the joining state with the main body.

  The present invention has been made to solve the above-described problem, and an optimum local reinforcement position detection method, apparatus, and optimum local reinforcement position capable of efficiently detecting an optimum local reinforcement position. An object is to obtain a method for reinforcing a part based on a detection method.

(1) An optimum local reinforcement position detection method according to the present invention is an optimum local reinforcement position detection method in which a computer detects a local optimum reinforcement position in a component constituting a structure by structural analysis , and the computer Each means realized by executing the program performs each process,
Analysis model generating means comprises a structural analysis model generating step of generating a structural analysis model of the part using the planar element and / or three-dimensional elements,
A region dividing unit sets a reference axis serving as a reference for the generated structural analysis model , and divides the structure analysis model into a plurality of regions having an arbitrary width at a predetermined angle with respect to the reference axis within an arbitrary range of the structural analysis model. A region dividing step to be performed;
A rigidity changing step in which the rigidity changing means changes the rigidity by increasing the elastic modulus or increasing / decreasing the plate thickness for an arbitrary area among the divided areas;
A rigidity analysis step in which rigidity analysis means performs rigidity analysis by constraining at least one end of the analysis model for each structural analysis model in which the rigidity is partially changed;
The optimum reinforcement position detecting means includes an optimum reinforcement position detecting step of detecting an optimum local reinforcement position in the part based on the plurality of rigidity analysis results.

(2) Further, in the above (1), the rigidity changing step is characterized by changing a plate thickness and / or an elastic modulus of the arbitrary region.

(3) A method for reinforcing a component according to the present invention includes installing a bulkhead based on the optimum local reinforcement position detected by the optimum local reinforcement position detection method described in (1) or (2) above. It is characterized by reinforcing parts.

(4) The component reinforcing method according to the present invention uses a tailored blank material based on the optimum local reinforcement position detected by the optimum local reinforcement position detection method described in (1) or (2) above. It is characterized by reinforcing parts.

(5) An optimum local reinforcement position detection device according to the present invention is an optimum local reinforcement position detection device that detects a local optimum reinforcement position in a component constituting a structure by structural analysis ,
An analysis model generating means for generating a structural analysis model of the part using a planar element and / or a three-dimensional element;
A region dividing means for setting a reference axis serving as a reference to the generated structural analysis model, and dividing into a plurality of regions having an arbitrary width at a predetermined angle with respect to the reference axis in an arbitrary range of the structural analysis model; ,
Rigidity changing means for changing the rigidity by increasing the elastic modulus or increasing or decreasing the plate thickness for an arbitrary area among the divided areas,
Each structural analysis model in which the rigidity is partially changed includes rigidity analysis means for performing rigidity analysis by restraining at least one end of the analysis model .

(6) Further, in the above (5), there is provided an optimum reinforcement position detecting means for detecting an optimum local reinforcement position in the part based on the plurality of rigidity analysis results. is there.

(7) In the above (5) or (6), the rigidity changing means changes the plate thickness and / or elastic modulus of the arbitrary region.

  In the present invention, since the rigidity of the part itself is locally changed to be in the same state as the part on which the local reinforcing member is installed, the optimal local reinforcing position can be detected efficiently. it can.

It is a flowchart figure for demonstrating the flow of the process of the optimal local reinforcement position detection method which concerns on embodiment of this invention. It is explanatory drawing for demonstrating the optimal local reinforcement position detection apparatus which concerns on embodiment of this invention. It is explanatory drawing explaining the components of the optimal local reinforcement position detection object which concerns on embodiment of this invention. It is explanatory drawing for demonstrating the area | region division process of the optimal local reinforcement position detection method which concerns on embodiment of this invention. It is explanatory drawing for demonstrating the rigidity analysis process of the optimal local reinforcement position detection method which concerns on embodiment of this invention (the 1). It is explanatory drawing for demonstrating the rigidity analysis process of the optimal local reinforcement position detection method which concerns on embodiment of this invention (the 2). It is explanatory drawing for demonstrating the rigidity analysis process of the optimal local reinforcement position detection method which concerns on embodiment of this invention (the 3). It is explanatory drawing for demonstrating the rigidity analysis result of the rigidity analysis process demonstrated using FIG. It is explanatory drawing for demonstrating the rigidity analysis result of the rigidity analysis process demonstrated using FIG. It is explanatory drawing for demonstrating the rigidity analysis result of the rigidity analysis process demonstrated using FIG. It is explanatory drawing for demonstrating the vehicle body which concerns on the Example of this invention. It is explanatory drawing for demonstrating the area | region division | segmentation process which concerns on the Example of this invention. It is explanatory drawing for demonstrating the rigidity analysis process which concerns on the Example of this invention. It is explanatory drawing for demonstrating the bulkhead as a comparative example in the Example of this invention. It is explanatory drawing for demonstrating the rigidity analysis result of the rigidity analysis process demonstrated using FIG. 13, and the result of a comparative example.

  The optimal local reinforcement position detection method according to an embodiment of the present invention includes an analysis model generation step of generating an analysis model of the part using a planar element and / or a solid element as shown in the flowchart of FIG. S1 and a region dividing step of setting a reference axis as a reference for the generated analysis model, and dividing into a plurality of regions of an arbitrary width at a predetermined angle with respect to the reference axis in an arbitrary range of the analysis model S3, a stiffness changing step S5 for changing the stiffness of any of the divided regions, a stiffness analyzing step S7 for performing a stiffness analysis on each analysis model whose stiffness has been partially changed, and the plurality of stiffnesses An optimum reinforcement position detection step S9 for detecting an optimum local reinforcement position in the part based on the analysis result is performed.

  Since the optimal local reinforcement position detection method is performed by a device such as a PC (personal computer) that executes program processing, first, the configuration of the device (hereinafter referred to as “optimal local reinforcement position detection device 1”) is illustrated. An outline will be given based on the block diagram shown in FIG.

[Optimum local reinforcement position detector]
An optimal local reinforcement position detection device 1 according to an embodiment of the present invention is configured by a PC (personal computer) or the like, and as shown in FIG. 2, a display device 3, an input device 5, a main storage device 7, and an auxiliary device. A storage device 9 and an arithmetic processing unit 11 are included.
The arithmetic processing unit 11 is connected to the display device 3, the input device 5, the main storage device 7, and the auxiliary storage device 9, and performs each function according to commands from the arithmetic processing unit 11. The display device 3 is used for displaying calculation results, and is composed of a liquid crystal monitor or the like. The input device 5 is used for input from an operator, and is composed of a keyboard, a mouse, and the like. The main storage device 7 is used for temporary storage and calculation of data used in the arithmetic processing unit 11, and is constituted by a RAM or the like. The auxiliary storage device 9 is used for data storage and the like, and is composed of a hard disk or the like.

  The arithmetic processing unit 11 is constituted by a CPU such as a PC, and the arithmetic processing unit 11 includes an analysis model generating unit 13, a region dividing unit 15, a stiffness changing unit 17, a stiffness analyzing unit 19, and an optimum reinforcement position. Detection means 21. These means are realized by a CPU or the like executing a predetermined program. These means will be described below.

<Analysis model generation means>
The analysis model generation means 13 generates an analysis model of a part using a plane element (shell element), a solid element (solid element), or both a plane element and a solid element.
In the present embodiment, the analysis model 31 is created for the hollow part as an example of the part to be analyzed. As shown in FIGS. 3A and 3B, the analysis model 31 includes a hat cross-sectional component 33 having a height of 80 mm and a flat plate 35 having a width of 120 mm that covers the opening of the hat cross-sectional component 33. And is formed in a cylindrical shape having a length of 800 mm. The width of the flange portion 33a of the hat cross-sectional component 33 is 20 mm. The hat cross-sectional component 33 and the flat plate 35 are joined by spot welding the flange portion 33a and the end portion of the flat plate 35 that contacts the flange portion 33a. Spot welding is performed with a spot having a diameter of 6 mm at a position of 7.5 mm from the width direction end of the flange portion 33 a at a pitch of 40 mm in the longitudinal direction of the hat cross-sectional component 33. The thickness of the analysis model 31 is 1.2 mm.

<Area dividing means>
The area dividing unit 15 sets a reference axis serving as a reference for the analysis model, and divides the analysis model into a plurality of areas having an arbitrary width on a plane having a predetermined angle with respect to the reference axis in an arbitrary range of the analysis model.
The width of each region may be a uniform width or may be different for each region. Alternatively, the width may be determined by assuming the width at which the bulkhead can be actually reinforced, for example, the width at which the bulkhead can be installed, or a width that is finer than that.
The reference axis is set so that the region division as described above can be easily performed. For example, an axis along the shape of the component to be analyzed may be set.
FIG. 4 is a diagram for explaining an example of region division for the analysis model 31 of the hollow part. The reference axis is the longitudinal axis of the analysis model 31, and is a plane perpendicular to the reference axis of the analysis model 31 between the longitudinal positions 200 mm and 500 mm with one end of the analysis model 31 as a reference and 15 mm in width of 20 mm. Divided into areas. In FIG. 4, each divided region is color-coded with gray shades so that it can be distinguished from other regions.

<Rigidity change means>
The rigidity changing means 17 changes the rigidity of an arbitrary area among the areas divided by the area dividing means 15. The rigidity is changed by, for example, increasing the elastic modulus in an arbitrary region, conversely decreasing it, or increasing or decreasing the plate thickness. Here, the elastic modulus means Young's modulus, Poisson's ratio, bulk elastic modulus, and rigidity.
In addition, if the width of each region is the same for components having different cross-sectional areas (for example, components whose diameter decreases from one end to the other), the thickness of each region is increased or decreased uniformly. Thus, the amount of weight increase / decrease accompanying the increase / decrease of the plate thickness is different in each region. In this case, the increase / decrease in the plate thickness in each region may be adjusted so that the increase / decrease in the plate thickness is not made uniform but the weight increase / decrease amount is the same.

<Rigidity analysis means>
The rigidity analysis means 19 performs rigidity analysis on each analysis model whose rigidity has been partially changed by the rigidity change means 17. The stiffness analysis may be performed on an analysis model of a single component, or the stiffness analysis of the entire structure may be performed in a state where the analysis model of the component is incorporated in the analysis model of the structure.

<Optimum reinforcement position detection means>
The optimum reinforcement position detecting means 21 detects an optimum local reinforcement position in the part based on a plurality of rigidity analysis results.

[Optimum local reinforcement position detection method]
An example of a method for detecting an optimum local reinforcement position using the optimum local reinforcement position detection apparatus 1 of the present embodiment configured as described above, together with the operation of the optimum local reinforcement position detection apparatus 1, is shown in FIG. This will be described with reference to the flowchart diagram and FIGS.
The case where the optimal local reinforcement position is detected will be described below by taking the analysis model 31 (see FIG. 3) as an example.

<Analysis model generation process>
First, an analysis model 31 of a hollow part is generated using the analysis model generation means 13 (analysis model generation step S1). In the present embodiment, the plate thickness is 1.2 mm and the mesh size is 10 mm × 10 mm.

<Area division process>
Next, the analysis model 31 is divided into a plurality of regions having an arbitrary width at a predetermined angle with respect to the reference axis by using the region dividing means 15 (region dividing step S3). In this embodiment, as shown in FIG. 4, it is divided into a plurality of 15-divided areas with a width of 20 mm.

<Rigidity change process>
Next, the stiffness is changed for an arbitrary region among the regions divided in the region dividing step S3 using the stiffness changing means 17 (rigidity changing step S5). In this embodiment, the thickness of the region where the rigidity is changed is set to 2.4 mm, which is twice that of the other regions.

<Rigidity analysis process>
Next, the stiffness analysis is performed on each analysis model 31 whose stiffness has been partially changed in the stiffness changing step S5 using the stiffness analyzing means 19 (stiffness analyzing step S7).
In the present embodiment, when performing the rigidity analysis of the analysis model 31 alone, it is performed under the three conditions of the bending load condition, the torsion load condition, and the horizontal load condition to the coil support section as an example of the load constraint condition. . This will be described in detail below.

  As shown in FIG. 5A, the bending load condition is one in which one end of the analysis model 31 is completely restrained and a load of 490 N is applied downward to the center of the other end surface. FIG. 5B shows a deformation state of the analysis model 31 after the bending load is applied.

As shown in FIG. 6, the torsional load condition was completely restrained at one end as in the case of the bending load condition, and a torsional moment of 1 × 10 ⁶ N · mm was applied to the center of the other end face of the analysis model 31. Is. FIG. 6B shows a deformation state of the analysis model 31 after the torsional load is applied.

  As shown in FIG. 7, the horizontal load condition on the coil support part is that the both ends of the analysis model 31 are completely restrained, and the coil support part 31 a provided at the center of the upper surface of the analysis model 31 (longitudinal position 400 mm) A load of 10 N is applied so as to be orthogonal to the longitudinal direction of the analysis model 31 in the horizontal direction. FIG. 7B shows the deformation state of the analysis model 31 after the horizontal load is applied.

<Optimum reinforcement position detection process>
Next, the optimum local reinforcement position in the analysis model 31 is detected based on the result of the stiffness analysis step S7 using the optimum reinforcement position detection means 21 (optimum reinforcement position detection step S9). The rigidity analysis result for each constraint load condition will be described below with reference to FIGS.

FIG. 8 shows the result of rigidity analysis when a bending load is applied. FIG. 8 is a graph of the rate of change in stiffness for each analysis model 31 whose stiffness has been changed. The vertical axis in FIG. 8 indicates the rigidity change rate (%), and the horizontal axis indicates the central position (mm) in the longitudinal direction from the constrained one end of the 20 mm region in which the rigidity of the analysis model 31 is changed. The stiffness change rate (%) is obtained by comparing the stiffness analysis result G1 in the stiffness analysis step S7 with the stiffness analysis result G2 when the stiffness performed for comparison is not changed by the following equation (1).
Rigidity change rate (%) = | G2-G1 | / G1 × 100 (1)

  When a bending load is applied, as shown in FIG. 8, the rate of change in stiffness increases as the load is applied to the restraint side. From this, it can be seen that the rigidity of the analysis model 31 is improved by improving the rigidity of the restraining side area rather than improving the rigidity of the load applying side area. In addition, each plot shown by the arrow in FIG. 8 has shown the position of the welding spot.

FIG. 9 shows the result of stiffness analysis when a torsional load is applied. The vertical and horizontal axes in FIG. 9 are the same as those in FIG.
When a torsional load is applied, it is almost flat as shown in FIG. 9, which means that the rigidity improvement is the same at any position. In addition, each plot shown by the arrow in FIG. 9 becomes slightly higher in the stiffness change rate than the values of the adjacent plots due to the influence of the welding spot as in the case of FIG.

FIG. 10 shows the result of rigidity analysis when a coil support portion 37a is provided in the center of the upper surface of the analysis model 31 and a horizontal load is applied to the coil support portion 37a. The vertical and horizontal axes in FIG. 10 are the same as those in FIGS. 8 and 9.
When a horizontal load is applied to the coil support portion 37a, as shown in FIG. 10, the rigidity change rate when the rigidity of the region in the vicinity of the coil support portion 37a (longitudinal position 400 mm) is improved is high. This means that reinforcing the vicinity of the coil support portion 37a is most effective in increasing the rigidity of the analysis model 31 (hollow part).

  Based on the above results, for example, when detecting the optimum reinforcement position when a horizontal load is applied to the coil support portion 37a, it is most effective to improve the rigidity in the vicinity of the coil support portion 37a as described above. Therefore, the optimum reinforcement position detecting means 21 detects the vicinity of the coil support portion 37a as the optimum reinforcement position.

  In the above description, the optimum local reinforcement position detection device 1 has been described as having the optimum reinforcement position detection means 21, but may not have the optimum reinforcement position detection means 21. In this case, the operator may determine based on the rigidity analysis result.

  As described above, in the present embodiment, which region contributes most to the overall stiffness by changing the stiffness of the component itself for each arbitrary region of the component and performing a stiffness analysis and comparison. Can be confirmed, and based on the result, the optimum reinforcement position in the part can be detected.

  When it is desired to improve the rigidity of the component, a local reinforcing member (for example, a bulkhead) may be installed later based on the local reinforcing position detected as described above. Moreover, if a part is created using the tailored blank material which can reinforce a local reinforcement position, the rigidity of a part can be improved effectively similarly to the case where a local reinforcement member is installed.

The effects of the optimum local reinforcement position detection device 1 according to the present invention will be described based on specific examples.
In the above-described embodiment, the rigidity analysis of the component (hollow component analysis model 31) alone is performed in the stiffness analysis step S7. For example, the analysis model generation step S1 of the present invention is performed for one component constituting the structure. When the stiffness analysis step S7 is performed by applying the region dividing step S3 and the stiffness changing step S5, the stiffness analysis of the structure is performed in a state in which the part is incorporated in the structure, so that the entire structure of the stiffness change is performed. You can see the effect on the stiffness.
Therefore, in the present embodiment, the above-described steps (analysis model generation step S1, region division step S3, stiffness change step S5) are applied to the rear side member 43 which is one part constituting the vehicle body 41 shown in FIG. Rigidity analysis was performed with the member 43 incorporated in the vehicle body 41 (see FIG. 12A).

The dimensions of the vehicle body 41 used for the analysis were steel plates and steel materials having a width of 1200 mm, a length of 3350 mm, a height of 1130 mm, and a thickness of 0.8 mm to 2.0 mm. The reference weight is 125kg.
The rear side member 43 is a long component having a U-shaped cross-sectional shape and an overall length of 1030 mm, and is incorporated in the left and right rear sides of the vehicle body 41. Since the rear side member 43 has the same shape on the left and right, the following description will be given by taking the rear side member 43 on the left rear as an example. The rear side member 43 has a coil support portion A on the lower surface side in a state of being incorporated in the vehicle body 41, and the vehicle body 41 is supported by a coil (not shown) in the coil support portion A.

As shown in FIG. 12, the predetermined range (details will be described later) of each rear side member 43 is divided into 13 regions every other pitch at a pitch of 40 mm from the front of the vehicle body with a region width of 40 mm. In FIG. 12, each divided area is color-coded with gray shades so that it can be distinguished from other areas.
The rigidity was changed by changing the plate thickness of any one of the 13 divided areas to 10 times (0.8 mm × 10 = 8 mm).
As shown in FIG. 13, the load constraint condition of the stiffness analysis is restricted by restricting three of the four coil support portions (coil support portion A, coil support portion B, coil support portion C, coil support portion D). The vehicle body torsional load of applying a load of 0.5 kN to one place was subjected to rigidity analysis under four conditions by changing the place where the load was applied to every four places, and the average value of the rigidity analysis results under the four conditions was obtained. The average value of the torsional rigidity in the original shape of the vehicle body 41 (the vehicle body 41 incorporating the rear side member 43 that does not take rigidity improvement measures) is 25.1 (kN * m / deg).

Further, as a comparative example, the bulkhead 45 (see FIG. 14, width 97 mm, height) within the same range as the invention example of each rear side member 43 as shown in FIG. An analysis model with one 148 mm flange width 25 mm) was created, and the created analysis model was incorporated into the vehicle body 41. Thereafter, rigidity analysis of the vehicle body 41 was performed. Subsequently, an analysis model was created by shifting the installation position of the bulkhead 45 by 40 mm, and the analysis model was incorporated into the vehicle body 41 to perform rigidity analysis. The same operation was repeated 13 times. As described above, in the comparative example, it is necessary to recreate an analysis model one by one for each condition to be analyzed, incorporate it into the structure, and analyze the rigidity. In this respect, the present invention does not require time and effort.
The bulkhead 45 was installed by welding the center of the flange portion 45a of the bulkhead 45 and the rear side member 43 by spot welding.

  The result of the stiffness analysis is shown in FIG. The vertical axis in FIG. 15 represents the rigidity improvement rate (%) of the entire vehicle body as compared with the vehicle body 41 that has not taken rigidity improvement measures, and the horizontal axis represents the vicinity of the front seat in the vehicle body 41 as the origin, and the rear side member. The length in which the direction reaching 43 is the plus direction is shown. FIG. 15A shows the rigidity analysis result of the invention example, and FIG. 15B shows the rigidity analysis result of the comparative example.

  As can be seen from the graph of FIG. 15 (a), in the inventive example, the region between the distance of 1260 mm and 1740 mm from the vicinity of the front seat is divided. As shown in FIG. 15A, in the invention example, the maximum value (stiffness improvement rate = about 4.2) at a distance of 1660 mm from the vicinity of the front seat (the rigidity analysis result when the thickness of the region having the coil support portion A is increased). The graph changes rapidly around the distance of 1660mm from the vicinity of the front seat. This clearly shows that the position at a distance of 1660 mm from the vicinity of the front seat is the optimum local reinforcement position.

  On the other hand, in the case of the comparative example, as shown in FIG. 15B, the slope of the graph is gentle, and there are two plots (1620mm, 1660mm) showing the maximum value of the rigidity improvement rate, which position is the optimum local reinforcement. It is not clear whether it is a position. The following reasons can be considered for this. The position where the bulkhead 45 has the maximum reinforcing effect is the position where the vertical wall portion 45b is located, but the installation position of the bulkhead 45 is the position of the welding spot in the center of the flange portion 45a, and the positions of both are shifted. Yes. When a load is applied to the vehicle body 41, the load is first applied to the welding spot, and is added to the vertical wall portion 45b via the flange portion 45a. Therefore, the optimum reinforcement position is detected with a deviation from the installation position. As described above, when the bulkhead 45 is directly incorporated in the vehicle body 41 and the rigidity analysis is performed, an accurate solution cannot be obtained.

  As described above, according to the present invention, the rigidity of the part (rear side member 43) itself is changed for each arbitrary region of the part (rear side member 43), and the rigidity analysis is performed and compared. It can be confirmed whether it contributes most to the rigidity of the entire structure (vehicle body 41), and based on the result, the optimum local reinforcement position in the component (rear side member 43) can be detected.

Further, in the present invention, the analysis may be performed by changing the parameters of the region even in a region where the local reinforcing member (such as the bulkhead 45) cannot be installed and analyzed.
In addition, it is not affected by the shape and installation conditions of the local reinforcement member as in the case of installing and analyzing the local reinforcement member (bulk head 45 etc.), so that the accurate local reinforcement position is detected. be able to.
In addition, even if the part (rear side member 43) is still incorporated in the vehicle body, it can be applied in the same manner as the case where the analysis is performed on a single part, so that it does not take time to create an analysis model of the vehicle body 41 for each part and is very efficient. It is.

  Further, if the rigidity, the collision characteristics, and the like are improved by reinforcing based on the optimum local reinforcing position, the parts can be reduced in weight by the improvement.

A, B, C, D Coil support 1 Optimal local reinforcement position detection device 3 Display device 5 Input device 7 Main storage device 9 Auxiliary storage device 11 Arithmetic processing unit 13 Analysis model generation means 15 Region division means 17 Stiffness change means 19 Rigidity analysis means 21 Optimal reinforcement position detection means 31 Analysis model 31a Coil support part 33 Hat cross-section part 33a Flange part 35 Flat plate 41 Car body 43 Rear side member 45 Bulk head 45a Flange part 45b Vertical wall part

Claims (7)

An optimum local reinforcement position detection method in which a computer detects a local optimum reinforcement position in a part constituting a structure by structural analysis, and each means realized by the computer executing a program performs each step Is,
Analysis model generating means comprises a structural analysis model generating step of generating a structural analysis model of the part using the planar element and / or three-dimensional elements,
A region dividing unit sets a reference axis serving as a reference for the generated structural analysis model , and divides the structure analysis model into a plurality of regions having an arbitrary width at a predetermined angle with respect to the reference axis within an arbitrary range of the structural analysis model. A region dividing step to be performed;
A rigidity changing step in which the rigidity changing means changes the rigidity by increasing the elastic modulus or increasing / decreasing the plate thickness for an arbitrary area among the divided areas;
A rigidity analysis step in which rigidity analysis means performs rigidity analysis by constraining at least one end of the analysis model for each structural analysis model in which the rigidity is partially changed;
An optimum local reinforcement position detection method, comprising: an optimum reinforcement position detection step in which an optimum reinforcement position detection means detects an optimum local reinforcement position in the part based on the plurality of rigidity analysis results. The optimal local reinforcement position detection method according to claim 1, wherein the rigidity changing step changes a plate thickness and / or an elastic modulus of the arbitrary region. A method for reinforcing a part, comprising: installing a bulkhead to reinforce the part based on the optimum local reinforcement position detected by the optimum local reinforcement position detection method according to claim 1. A method for reinforcing a part, comprising: reinforcing a part using a tailored blank material based on the optimum local reinforcement position detected by the optimum local reinforcement position detection method according to claim 1. An optimum local reinforcement position detecting device for detecting a local optimum reinforcement position in a part constituting a structure by structural analysis ,
An analysis model generating means for generating a structural analysis model of the part using a planar element and / or a three-dimensional element;
A region dividing means for setting a reference axis serving as a reference to the generated structural analysis model, and dividing into a plurality of regions having an arbitrary width at a predetermined angle with respect to the reference axis in an arbitrary range of the structural analysis model; ,
Rigidity changing means for changing the rigidity by increasing the elastic modulus or increasing or decreasing the plate thickness for an arbitrary area among the divided areas,
An optimum local reinforcement position detecting apparatus , comprising: a stiffness analysis unit that performs a stiffness analysis by restraining at least one end of the analysis model with respect to each structural analysis model in which the stiffness is partially changed. 6. The optimum local reinforcement position detecting device according to claim 5, further comprising optimum reinforcement position detecting means for detecting an optimum local reinforcement position in the part based on the plurality of rigidity analysis results. The optimal local reinforcement position detection apparatus according to claim 5 or 6, wherein the rigidity changing means changes a plate thickness and / or an elastic modulus of the arbitrary region.