Structural design support device, structural design support method, program, and recording medium

Abstract

The present invention provides a structural design support device that can easily identify regions that significantly affect the frequency response function in the frequency response. [Solution] The structural design support device includes: an evaluation point information acquisition unit that acquires evaluation point information representing the position of an evaluation point provided on a structure composed of multiple parts in a first state which is a stationary state, the displacement in a second state which is a state in which vibration is applied to the structure, and the phase difference with respect to the vibration; and an evaluation value calculation unit that uses the evaluation point information acquired by the evaluation point information acquisition unit to calculate an evaluation value representing the magnitude of the change in the positional relationship between the first evaluation point and the second evaluation point between the first state and the second state, wherein the evaluation value for the first evaluation point represents the magnitude of the change in distance considering the phase difference between the first evaluation point and the second evaluation point.

Description

[Technical Field]

[0001] This disclosure relates to a structural design support device, a structural design support method, a program, and a recording medium. [Background technology]

[0002] Conventionally, various structural design support devices have been proposed for evaluating and analyzing structures during the design phase. Generally, computers are used as structural design support devices, and programs for having the computer evaluate and analyze structures, as well as systems that implement these programs, have been proposed. In such structural design support devices, a model is constructed that represents the entire structure to be designed or each component of the structure divided into small regions (elements). This model is used to simulate the response to the application of external forces, and the obtained results are used to carry out the design.

[0003] For example, Patent Document 1 discloses a structural design support device comprising: an evaluation point information acquisition unit that acquires evaluation point information representing the position of an evaluation point provided on a structure composed of multiple parts in a first state, its position in a second state, and which of the multiple parts it belongs to; and an evaluation value calculation unit that uses the evaluation point information acquired by the evaluation point information acquisition unit to calculate an evaluation value representing the magnitude of change between the first state and the second state in the positional relationship between a first evaluation point belonging to a first part and a second evaluation point belonging to a second part different from the first part to which the first evaluation point belongs; wherein the evaluation value for the first evaluation point represents the magnitude of change between the first state and the second state in the distance between the first evaluation point and the second evaluation point; and the evaluation value calculation unit identifies the part to which the evaluation point with the maximum evaluation value belongs among the multiple parts different from the part to which the evaluation point belongs, and identifies the direction of the part to which the evaluation point with the maximum evaluation value belongs, with the position of the part to which the evaluation point belongs as a reference. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent No. 6278122 [Summary of the Invention] [Problems to be Solved by the Invention]

[0005] In Patent Document 1, since the phase was not sufficiently considered, it was not easy to identify the portion to be improved (for example, a portion that easily affects the frequency response function such as inertance) for a frequency response whose distance changes from moment to moment.

[0006] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a structure design support device, a structure design support method, a program, and a recording medium that can easily identify a portion having a large influence on a frequency response function in a frequency response. [Means for Solving the Problems]

[0007] To solve the above problems, the present invention proposes the following means. (1) A structure design support device according to aspect 1 of the present invention comprises: of an evaluation point provided on a structure composed of a plurality of components, a position in a first state that is a stationary state, a displacement in a second state in which vibration is applied to the structure, and a phase difference from the vibration, an evaluation point information acquisition unit that acquires evaluation point information representing: an evaluation value calculation unit that uses the evaluation point information acquired by the evaluation point information acquisition unit to calculate an evaluation value representing the magnitude of change in the positional relationship between a first evaluation point and a second evaluation point between the first state and the second state; comprising: The evaluation value related to the first evaluation point represents the magnitude of the change in distance that takes into account the phase difference between the first evaluation point and the second evaluation point. (2) Aspect 2 of the present invention is the structure design support apparatus according to Aspect 1, in which The distance between the first evaluation point and the second evaluation point is equal to or less than a preset threshold value. (3) Aspect 3 of the present invention is the structure design support apparatus according to Aspect 1 or 2, further comprising an image creation unit configured to create an image that allows the evaluation value to be visually recognized at the position of the corresponding evaluation point on the structure. (4) Aspect 4 of the present invention is the structure design support apparatus according to Aspect 1 or 2, in which the evaluation point information acquisition unit further acquires information indicating which one of the plurality of components the evaluation point belongs to, the evaluation value calculation unit calculates the evaluation value related to the first evaluation point using the first evaluation point belonging to a first component and the second evaluation point belonging to a second component different from the first component, and calculates the evaluation value related to the first component based on the evaluation value related to the first evaluation point. (5) A structure design support method according to Aspect 5 of the present invention comprises a first step of acquiring evaluation point information representing the position of an evaluation point provided on a structure composed of a plurality of components in a first state that is a stationary state, the displacement in a second state where vibration is applied to the structure, and the phase difference with the vibration, ; a second step of calculating an evaluation value representing the magnitude of change in the positional relationship between the first evaluation point and the second evaluation point between the first state and the second state using the evaluation point information; , wherein the evaluation value related to the first evaluation point represents the magnitude of change in distance that takes the phase difference between the first evaluation point and the second evaluation point into consideration. (6) A program according to Aspect 6 of the present invention causes a computer to function as process the position of an evaluation point provided on a structure composed of a plurality of components in a first state that is a stationary state, The displacement and the phase difference with respect to the vibration in the second state, in which vibration is applied to the aforementioned structure, An evaluation score information acquisition unit that acquires evaluation score information representing; An evaluation value calculation unit calculates an evaluation value that represents the magnitude of the change in the positional relationship between the first state and the second state between the first state and the second state, using the evaluation point information acquired by the evaluation point information acquisition unit; and make it work The evaluation value for the first evaluation point represents the magnitude of the change in distance considering the phase difference between the first evaluation point and the second evaluation point. (7) The computer-readable recording medium of embodiment 7 of the present invention records the program of embodiment 6. [Effects of the Invention]

[0008] According to the above aspects of the present invention, it is possible to provide a structural design support device, a structural design support method, a program, and a recording medium that can easily identify locations in the frequency response that have a significant impact on the frequency response function. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic block diagram showing the configuration of a structural design support device 10 according to the first embodiment of the present invention. [Figure 2] This is a flowchart illustrating the operation of the evaluation value calculation unit 13. [Figure 3] This diagram illustrates the positions of the reference point i and comparison point j in the first state, and the positional relationship between the reference point i and comparison point j in the second state. [Figure 4] This is a diagram illustrating the structural model and excitation location. [Figure 5] This is a distribution diagram of evaluation values ​​calculated taking phase differences into consideration. [Figure 6] This is a diagram showing the elastic strain energy density distribution. [Figure 7] This is a distribution chart of evaluation values ​​calculated without phase difference. [Figure 8]This figure shows the maximum inertance after implementing countermeasures at the locations identified in Example 1, Comparative Example 1, and Comparative Example 2. [Modes for carrying out the invention]

[0010] "First Embodiment" The first embodiment will be described below with reference to the drawings. In the following embodiment, the objective of reducing inertance is described as an example of the purpose of frequency response in the design stage of a structure. Here, inertance is one of the transfer functions in the field of vibration, and refers to the ratio of the force input to an object to the acceleration that can be generated by it (acceleration / force). However, the purpose of structural analysis in the design stage of a structure is not limited to improving inertance, but can also be to understand the vibration characteristics of the vehicle and identify problems, and structural analysis can be performed according to the needs.

[0011] <Structure design support device 10> Figure 1 is a schematic block diagram showing the configuration of the structural design support device 10 according to the first embodiment. The structural design support device 10 evaluates a structure consisting of multiple parts using a virtual model (hereinafter referred to as "structure"). The structure is assembled from multiple parts joined together by, for example, welding, crimping, bolting, etc. The structural design support device 10 includes an evaluation point information acquisition unit 11, an evaluation point information storage unit 12, an evaluation value calculation unit 13, an image creation unit 14, and a display unit 15.

[0012] The evaluation point information acquisition unit 11 acquires evaluation point information representing the position (displacement, phase difference, etc.) of evaluation points provided on the structure to be evaluated in the first state and the position (displacement, phase difference, etc.) in the second state. The evaluation point information acquisition unit 11 may also acquire information on which of the multiple components constituting the structure the evaluation point belongs to. The first state is, for example, a state in which no external load is applied to the structure model (static state). The second state is, for example, a state in which vibration is applied to the structure model by a predetermined external load. The evaluation points are, for example, the vertices (nodes) of the elements in the finite element method when the structure is analyzed using the finite element method in each state. The evaluation point information (evaluation point information for the second state) is calculated by performing a frequency response analysis of the structure model using the finite element method. The frequency response analysis may be performed using the full method or the mode superposition method. In addition, the vibration conditions applied to the structure (load, position where vibration is applied, frequency) can be adjusted as appropriate according to the purpose. Note that the evaluation point information may also be calculated by numerical simulation other than the finite element method, for example.

[0013] The evaluation point information storage unit 12 stores the evaluation point information acquired by the evaluation point information acquisition unit 11. That is, the evaluation point information storage unit 12 stores evaluation point information that represents the position in a first state and the position (displacement, phase difference) in a second state of an evaluation point provided on a structural model composed of multiple parts. The evaluation point information storage unit 12 may also store information as evaluation point information indicating which of the multiple parts the evaluation point belongs to.

[0014] The evaluation value calculation unit 13 uses the evaluation point information acquired by the evaluation point information acquisition unit 11 to calculate an evaluation value that represents the magnitude of the change in the positional relationship between the first evaluation point and the second evaluation point between the first state and the second state. Details of the method by which the evaluation value calculation unit 13 calculates the evaluation value will be described later.

[0015] The image creation unit 14 creates an image in which the evaluation value or the rate of change of distance related to the evaluation point is visible at the location of the evaluation point in the structural model. For example, the image creation unit 14 generates a three-dimensional image of the structural model in which the evaluation value of each evaluation point calculated by the evaluation value calculation unit 13 is represented by shades of gray. Alternatively, the evaluation value of each evaluation point may be represented in color instead of shades of gray.

[0016] The display unit 15 may display the evaluation value calculated by the evaluation value calculation unit 13, or it may display a three-dimensional image of the structure model generated by the image creation unit 14.

[0017] <Structure design support method> The structural design support method of this disclosure includes a first step of acquiring evaluation point information representing the position of an evaluation point provided on a structure composed of multiple parts in a first state, which is a static state, the displacement in a second state, which is a state in which vibration is applied to the structure, and the phase difference with respect to the vibration. The structural design support method of this disclosure further includes a second step of using the evaluation point information acquired in the first step to calculate an evaluation value representing the magnitude of the change in the positional relationship between the first evaluation point and the second evaluation point between the first state and the second state. Here, the evaluation value for the first evaluation point represents the magnitude of the change in distance between the first evaluation point and the second evaluation point, taking into account the phase difference.

[0018] In the first process, evaluation point information is obtained that represents the position of evaluation points on a structure composed of multiple parts in a first state (a static state), the displacement of the evaluation points in a second state (a state in which vibration is applied to the structure), and the phase difference with the vibration. The first state is, for example, a state in which no external load is applied to the structure model (static state). The second state is, for example, a state in which vibration is applied to the structure model by a predetermined external load. The evaluation points are, for example, the vertices (nodes) of the elements in the finite element method when the deformation of the structure in each state is analyzed using the finite element method. The evaluation point information (evaluation point information for the second state) is calculated by performing a frequency response analysis of the structure model using the finite element method. The frequency response analysis may be performed using the full method or the mode superposition method. The vibration conditions applied to the structure can be adjusted as appropriate according to the purpose. Note that the evaluation point information may also be calculated by numerical simulations other than the finite element method.

[0019] In the second process, using the evaluation point information obtained in the first process, an evaluation value is calculated that represents the magnitude of the change in the positional relationship between the first evaluation point and the second evaluation point between the first state and the second state. The method for calculating the evaluation value related to the evaluation points using the evaluation value calculation unit 13 of the structural design support device 10 will be described below, but the present invention is not limited to the following method.

[0020] (Method for calculating evaluation values) Figure 2 is a flowchart illustrating the operation of the evaluation value calculation unit 13. In Figure 2, the first state is a state in which no vibration is applied to the structural model (static state), and the second state is a state in which the assumed vibration is applied to the structural model (vibration state).

[0021] The evaluation value calculation unit 13 performs the processes of steps S1 to S8 for each of the evaluation points included in the evaluation point information stored in the evaluation point information storage unit 12 (steps S1 to S8). In step S1, one selected point among the unevaluated evaluation points is defined as a reference point (evaluation point) i (for example, initial value i=0). The evaluation value calculation unit 13 reads, from the evaluation point information storage unit 12, the position (X coordinate, Y coordinate, Z coordinate) of the reference point i in the first state, and the displacement of the evaluation point in the second state and the phase difference from the applied vibration. Here, the displacement u of the reference point i in the second state, which is calculated by frequency response analysis with the applied vibration defined as F0sinωt (F0: load, ω: angular frequency, t: time) xi is represented by the following formula (1). u in the following formula (1) xi0 represents the amplitude (amplitude in the X direction at the reference point i), ω represents the angular frequency, t represents time, and φ xi represents the phase difference from the applied vibration (phase difference in the X direction at the reference point i). The calculated displacement u of the Y coordinate of the reference point i yi is represented by the following formula (2). u in the following formula (2) yi0 represents the amplitude (amplitude in the Y direction at the reference point i), ω represents the angular frequency, t represents time, and φ yi represents the phase difference from the applied vibration (phase difference in the Y direction at the reference point i). The calculated displacement u of the Z coordinate of the reference point i zi is represented by the following formula (3). u in the following formula (3) zi0 represents the amplitude (amplitude in the Z direction at the reference point i), ω represents the angular frequency, t represents time, and φ zi represents the phase difference from the applied vibration (phase difference in the Z direction at the reference point i).

[0022] [Equation]

[0023] Next, in step S2, one selected point from the unprocessed evaluation points is set as the comparison point (evaluation point) j (initial value is, for example, j=0). The evaluation value calculation unit 13 reads from the evaluation point information storage unit 12 the position (X coordinate, Y coordinate, Z coordinate) of the comparison point j in the first state, the displacement of the evaluation point in the second state, and the phase difference with the applied vibration. Here, the displacement u of the X coordinate of the comparison point j in the second state is calculated by frequency response analysis with the applied vibration as F0sinωt (F0: load, ω: angular frequency, t: time). xj u in equation (4) below xj0 ω represents the amplitude (amplitude in the X direction at comparison point j), ω represents the angular frequency, t represents time, and φ represents the angular frequency. xj This indicates the phase difference with the applied vibration (phase difference in the X direction at comparison point j). The calculated displacement u of the Y coordinate of comparison point j. yj is expressed by the following equation (5). The u in the following equation (5) yj0 ω represents the amplitude (amplitude in the Y direction at comparison point j), ω represents the angular frequency, t represents time, and φ represents the angular frequency. yj This indicates the phase difference with the applied vibration (phase difference in the Y direction at comparison point j). The calculated displacement u of the Z coordinate of comparison point j. zj u in equation (6) below zj0 ω represents the amplitude (amplitude in the Z direction at comparison point j), ω represents the angular frequency, t represents time, and φ represents the angular frequency. zj This indicates the phase difference with respect to the applied vibration (phase difference in the Z direction at comparison point j).

[0024]

number

[0025] Next, the evaluation value calculation unit 13 uses the positions of each evaluation point read in steps S1 and S2 to calculate the distance F0 between the reference point i in the first state and the comparison point j. i,j Calculate (Step S3). For example, the X coordinate of the reference point i in the first state is X i And the Y coordinate is Y i And the Z coordinate is Z iAnd the X-coordinate of the comparison point j in the first state is X j And the Y coordinate is Y j And the Z coordinate is Z j When this is the case, the distance F0 i,j This is calculated using the following formula (7).

[0026]

number

[0027] The evaluation value calculation unit 13 calculates the distance F0 in step S3. i,j However, it is determined whether or not it is below a predetermined threshold α (step S4). If it is determined that it is not below the threshold α (NO in step S4), the process proceeds to step S6. If there are any unprocessed comparison points j (YES in step S6), the process returns to step S2, and one of the unprocessed comparison points j is selected and processed. If there are no unprocessed comparison points j (NO in step S6), the process in step S7 is performed.

[0028] When it is determined that the value is below the threshold α (YES in step S4), the evaluation value calculation unit 13 calculates the maximum value or integral value of the distance change rate in the frequency response analysis. As shown in Figure 3, before load input (static state, first state), a reference point i and a comparison point j are located at a certain coordinate, and after load input (after excitation, second state), at a certain phase, the reference point i moves to the position of point i' and the comparison point j moves to the position of point j'. In Figure 3, u i This indicates the vector connecting point i and point i', and u j This indicates the vector connecting point j and point j', and l ij l' represents the vector connecting point i and point j. ij This represents the vector connecting point i' and point j'. In this case, the rate of change of distance E is ij This is calculated from equation (8) below. In equation (8), |l ij | is the vector l ij The length is indicated by |l' ij | is the vector l' ij It indicates the length.

[0029]

number

[0030] The distance change rate E in the above formula (8) ij The relative displacement vector u is expressed by the following equation (9) ij By using this, it can be expressed by the following equation (10).

[0031]

number

[0032] Furthermore, the vector e represented by the following equation (11) ij By using this, the rate of change of distance E ij It is expressed by equation (12) below. Calculating the right-hand side of equation (12) and combining it with sinωt and cosωt, we obtain equation (13) below. Further combining sinωt and cosωt in equation (13) below, we obtain equation (14) below. A in equations (13) and (14) below is expressed by equation (15) below, and B in equations (13) and (14) below is expressed by equation (16) below.

[0033]

number

[0034] From equation (14) above, the maximum value of the distance rate of change in frequency response analysis is expressed by equation (17) below. When the evaluation value calculation unit 13 wants to find the integral value of the distance rate of change, it can be calculated from (18) below. By using the maximum value of the distance rate of change in frequency response analysis, it is possible to detect cases where spatial distortion is particularly large in a limited phase.

[0035]

number

[0036] Next, the process proceeds to step S6. If there are any unprocessed comparison points j (YES in step S6), the process returns to step S2, and one of the unprocessed comparison points j is selected and processed. If there are no unprocessed comparison points j (NO in step S6), the process in step S7 is performed.

[0037] In step S7, the distance change rate E calculated in step S5 is used in the frequency response analysis. ij Calculate the average of the maximum values ​​or the average of the integral values. The spatial distortion increases as there are more evaluation points (nodes) around, but by calculating the average, the influence of the number of surrounding evaluation points can be eliminated when evaluating the spatial distortion. Evaluation value E i The rate of change of distance E ij When using the maximum value, it is expressed by the following equation (19), and the distance change rate E ij When using the integral value of , it is expressed by the following equation (20). Here, j in equations (19) and (20) below is F0 i,j j is such that ≤ α, and N is F0 i,j This is the number of j values ​​that satisfy ≤α. In other words, N is a value determined based on the threshold α.

[0038]

number

[0039] After calculating the evaluation value Ei, the process then proceeds to step S8. If there are any unprocessed reference points i (YES in step S8), the process returns to step S1, and one of the unprocessed reference points i is selected and processed. If there are no unprocessed reference points i (NO in step S8), the loop from steps S1 to S8 (i.e., the process) is terminated. The obtained evaluation value is sent to the display unit 15.

[0040] The threshold value α is a variable that corresponds to the target component, the finite element mesh, the design phase, etc. The threshold value α may be set in advance or set by the operator operating the structural design support device 10. It is desirable that the value of the threshold value α corresponds to the size by which the structure can be modified. The evaluation value calculation unit 13 may store threshold values ​​α corresponding to the size by which the structure can be modified in advance, and when the operator specifies the size by which the structure can be modified, it may determine the threshold value α corresponding to the size specified by the operator according to that store. Furthermore, the numerical value of the threshold value α can be set according to the purpose of the design. For example, when considering the integration of each component, it is preferable that the threshold value α be 10 mm to 200 mm. Also, when considering the addition of components or a frame, the threshold value α may be 100 mm to 4000 mm.

[0041] The evaluation area should ideally be within the range where structural modifications are possible. To ensure a sufficient number of analysis points within the evaluation area, it is desirable that the evaluation area be larger than a sphere with a diameter at least four times the distance between analysis points. Furthermore, since the magnitude of structural modifications that can be made differs depending on the design stage, adjusting the size of the evaluation area accordingly allows for its use at various design stages.

[0042] The evaluation value calculation unit 13 may be used to calculate an evaluation value for a part. Here, the evaluation point information acquisition unit 11 further acquires information on which of the multiple parts the evaluation point belongs to, and the evaluation point information storage unit 12 stores the information on which of the multiple parts the evaluation point belongs to. The evaluation value calculation unit 13 uses the first evaluation point (reference point) i belonging to the first part (target part) m and the second evaluation point (comparison point) j belonging to a second part (comparison part) n different from the first part m to calculate an evaluation value E for the first evaluation point. mi The evaluation value calculation unit 13 calculates the evaluation value E related to the first evaluation score. mi Based on this, the evaluation value E for the first part i The following calculation may be performed: The evaluation score for a part may be the average value of the individual evaluation scores within the part, or the sum of those scores.

[0043] The structural design support device 10 according to this embodiment has been described above. The structural design support device 10 according to the first embodiment includes an evaluation point information acquisition unit 11 that acquires evaluation point information representing the position of an evaluation point provided on a structure composed of multiple parts in a first state which is a stationary state, the displacement in a second state which is a state in which vibration is applied to the structure, and the phase difference with the vibration. The structural design support device 10 further includes an evaluation value calculation unit 13 that uses the evaluation point information acquired by the evaluation point information acquisition unit 11 to calculate an evaluation value that represents the magnitude of the change in the positional relationship between the first evaluation point and the second evaluation point between the first state and the second state. The evaluation value for the first evaluation point calculated by the evaluation value calculation unit 13 represents the magnitude of the change in distance considering the phase difference between the first evaluation point and the second evaluation point.Therefore, in frequency response analysis, parts that have a large impact on reducing inertance can be easily identified.When obtaining evaluation values ​​for evaluation points, more detailed area evaluation can be performed.When calculating evaluation values ​​for parts, it is possible to perform the analysis in a short time.

[0044] The image creation unit 14 may create an image in which the evaluation values ​​for the target part m are visible at the location of the target part m in the structural model. For example, the image creation unit 14 generates a three-dimensional image of the structural model in which the evaluation values ​​of each part calculated by the evaluation value calculation unit 13 are represented by shades of gray. Alternatively, the evaluation values ​​of each part may be represented in color instead of shades of gray.

[0045] In this embodiment, an image creation unit 14 was included, but the image creation unit 14 may be omitted.

[0046] Each step of this embodiment described above may be configured to be performed automatically by the structural design support device 10.

[0047] The structural design support device 10 in Figure 1 may be realized by recording a program for realizing its functions on a computer-readable recording medium, loading the program recorded on this recording medium into a computer system, and executing it. The term "computer system" here includes hardware such as the operating system and peripheral devices.

[0048] Furthermore, "computer system" shall also include the homepage provisioning environment (or display environment) if a WWW system is being used. Furthermore, "computer-readable recording media" refers to portable media such as flexible disks, magneto-optical disks, ROMs, and CD-ROMs, as well as storage devices such as hard disks built into computer systems. Moreover, "computer-readable recording media" also includes those that dynamically hold programs for a short period of time, such as communication lines used when transmitting programs via networks such as the Internet or communication lines such as telephone lines, and those that hold programs for a certain period of time, such as volatile memory inside computer systems that act as servers or clients in such cases. In addition, the above-mentioned programs may be for the purpose of realizing some of the functions described above, and may also be programs that can realize the above-mentioned functions in combination with programs already recorded in the computer system.

[0049] While embodiments of this invention have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments, and design modifications and the like are also included, provided they do not depart from the spirit of this invention.

[0050] Each aspect of the present invention can be broadly applied to structural design support devices, structural design support methods, programs, and recording media for evaluating and analyzing structures during the design phase of various structures. Each aspect of the present invention makes it possible to realize structural design support devices, structural design support methods, programs, and recording media that can easily identify components that have a significant impact on the rigidity of a structure.

[0051] (Example 1) The following shows an example of analysis performed using the structural design support device 10 according to this embodiment. Using MSC Nastran as the software, frequency response analysis (SOL111) was performed on the structural model shown in Figure 4. As shown in Figure 4, the rear damper top (LH) was subjected to excitation of 1N at 35.556Hz (Z direction, natural frequency of the first torsional mode) as the boundary condition, and frequency response analysis was performed to obtain the position of the first state (static state), the amplitude of the second state (vibrated state) and the phase difference for each evaluation point.

[0052] For each evaluation point obtained, the evaluation area radius (threshold) α was set to 100 mm, and the evaluation value for that point was calculated using the above formula (18). The results are shown in Figure 5.

[0053] (Comparative Example 1) The elastic strain energy was calculated for the structure shown in Figure 4 when vibration was applied under the same conditions. The results are shown in Figure 6.

[0054] (Comparative Example 2) In the calculation of Example 1, all phase differences in equations (1) to (6) were set to 0, and the evaluation value for the evaluation point was calculated using equation (18). The obtained results are shown in Figure 7.

[0055] The inertance was calculated when points with high evaluation values ​​(elastic strain energy in the case of Figure 6) obtained in Figures 5-7 were connected by rigid bodies. The results are shown in Figure 8. As shown in Figure 8, the structural design support device 10, which calculated the evaluation value considering the phase difference, was able to reduce the inertance the most. From the above, it was shown that the structural design support device 10 makes it possible to easily identify points that have a large impact on the frequency response function. [Explanation of Symbols]

[0056] 10. Structural design support device, 11. Evaluation point information acquisition unit, 12. Evaluation point information storage unit, 13. Evaluation value calculation unit, 14. Image creation unit, 15. Display unit

Claims

1. Evaluation points set on a structure composed of multiple parts, The position in the first state, which is a state of rest. The displacement and the phase difference with respect to the vibration in the second state, in which vibration is applied to the aforementioned structure, An evaluation score information acquisition unit that acquires evaluation score information representing; An evaluation value calculation unit calculates an evaluation value that represents the magnitude of the change in the positional relationship between the first state and the second state between the first state and the second state, using the evaluation point information acquired by the evaluation point information acquisition unit; Equipped with, A structural design support device characterized in that the evaluation value for the first evaluation point represents the magnitude of the change in distance considering the phase difference between the first evaluation point and the second evaluation point.

2. The structural design support device according to claim 1, characterized in that the distance between the first evaluation point and the second evaluation point is less than or equal to a preset threshold.

3. The structural design support device according to claim 1 or 2, further comprising an image creation unit that creates an image in which the evaluation value is visible at the location of the evaluation point in the structure.

4. The evaluation point information acquisition unit further acquires information on which of the plurality of parts the evaluation point belongs to, The evaluation value calculation unit calculates the evaluation value relating to the first evaluation point using the first evaluation point belonging to the first component and the second evaluation point belonging to a second component different from the first component. A structural design support device according to claim 1 or 2, which calculates the evaluation value for the first component based on the evaluation value for the first evaluation point.

5. Evaluation points set on a structure composed of multiple parts, The position in the first state, which is a state of rest. The displacement and the phase difference with respect to the vibration in the second state, in which vibration is applied to the aforementioned structure, The first process involves obtaining evaluation score information representing the following: A second process of using the aforementioned evaluation point information to calculate an evaluation value representing the magnitude of change between the first state and the second state in the positional relationship between the first evaluation point and the second evaluation point; It has, A structural design support method characterized in that the evaluation value for the first evaluation point represents the magnitude of the change in distance considering the phase difference between the first evaluation point and the second evaluation point.

6. Computer Evaluation points set on a structure composed of multiple parts, The position in the first state, which is a state of rest. The displacement and the phase difference with respect to the vibration in the second state, in which vibration is applied to the aforementioned structure, An evaluation score information acquisition unit that acquires evaluation score information representing; An evaluation value calculation unit calculates an evaluation value that represents the magnitude of the change in the positional relationship between the first state and the second state between the first state and the second state, using the evaluation point information acquired by the evaluation point information acquisition unit; and make it work The evaluation value for the first evaluation point is a program that represents the magnitude of the change in distance considering the phase difference between the first evaluation point and the second evaluation point.

7. A computer-readable recording medium on which the program described in claim 6 is recorded.

Images