Generation device and generation method and program for space model around tire

Abstract

To prevent a failure in generating a space model around a tire having a sipe with a minute groove width at a tread part and improve precision of the space model.SOLUTION: A generation device 1 for a space model around a tire includes: a tire model generating part that generates a tire model by dividing a tire having a plurality of grooves at a tread part into a plurality of elements; a grounding analyzing part that performs grounding analysis of a state where a predetermined load is applied using the tire model to achieve a deformed tire model; and a space model generating part that generates a space model on the basis of a grounding shape of the tire model. The tire model generating part performs settings so that dummy elements are charged into a sipe whose groove width is equal to or below a predetermined width, of the plurality of grooves. The space model generating part extracts a surface of the tire model generated after removing dummies except for the dummy elements from the tire model deformed by grounding.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a device, a method, and a program for generating a spatial model around a tire.

Background Art

[0002] Patent Document 1 describes creating an outer spatial acoustic model of a tire model in a grounding state based on the analysis result of the grounding deformation of a tire model with a tread pattern. At this time, a space in which the inside of the groove of the tire and the space around it are continuous is modeled.

[0003] Patent Document 2 describes connecting data on the outer surface of a tire in which a tread model and a body model are connected, data on a road surface, and data on the outermost surface of a space around the tire having a predetermined shape, and generating a tire surrounding space model of a closed space surrounded by these respective data.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in the tread portion of an actual tire, sipes having a minute groove width may be provided on the ground contact surface of the raised land portion. However, in either of Patent Document 1 and Patent Document 2, setting sipes at the time of creating a tire model is not considered. Thus, there is room for improvement in terms of accurately simulating the tire model. On the other hand, in order to improve the accuracy of the tire model, it is conceivable to set sipes in the tire model. However, if sipes are simply set, when the ground contact deforms, the sipes on the ground contact surface deform, so that the minute-width groove-like space formed on the tread portion surface becomes narrow, and part or all of the sipes may be crushed into a state of being closed like a line or a state close to being closed like a line. As a result, mesh generation errors and deterioration of mesh quality may occur when generating the space model, and it may take a great deal of time to eliminate them. For this reason, there is room for improvement in terms of preventing generation failures of the space model and increasing the accuracy of the space model.

[0006] An object of the present invention is to prevent generation failures of a space model around a tire having sipes with a minute groove width in a tread portion and to increase the accuracy of the space model in a space model generation device, generation method, and program around the tire. Means for Solving the Problems

[0007] The apparatus for generating a spatial model around a tire according to the present invention includes a tire model creation unit that creates a tire model by dividing a tire having a plurality of grooves in a tread portion into a plurality of elements, a grounding analysis unit that performs a grounding analysis on the tire model under a state where a predetermined load is applied to obtain the deformed tire model, and a spatial model generation unit that generates a spatial model by dividing a predetermined space including a first space formed in a grounding portion and a second space having a predetermined shape outside the tire model into a plurality of elements based on the grounding shape of the tire model. The tire model creation unit is set to fill dummy elements in sipes, which are the grooves among the plurality of grooves having a groove width equal to or less than a predetermined width, and the spatial model generation unit extracts the surface of the tire model after removing the dummy elements from the tire model after grounding deformation. It is an apparatus for generating a spatial model around a tire.

[0008] The method for generating a spatial model around a tire according to the present invention includes a step of creating a tire model by dividing a tire having a plurality of grooves in a tread portion into a plurality of elements, a step of performing a grounding analysis on the tire model under a state where a predetermined load is applied to obtain the deformed tire model, and a step of generating a spatial model by dividing a predetermined space including a first space formed in a grounding portion and a second space having a predetermined shape outside the tire into a plurality of elements based on the grounding shape of the tire model. The step of creating the tire model is set to fill dummy elements in sipes, which are the grooves among the plurality of grooves having a groove width equal to or less than a predetermined width, and the step of generating the spatial model extracts the surface of the tire model after removing the dummy elements from the tire model after grounding deformation. It is a method for generating a spatial model around a tire.

[0009] The program according to the present invention is a program for causing a computer to execute the method for generating a spatial model around a tire according to the present invention.

Advantages of the Invention

[0010] According to the apparatus, method, and program for generating a space model around a tire according to the present invention, when creating a tire model for a tire having sipes with a minute groove width in the tread portion, it is possible to prevent the sipes from being crushed into a state where they are closed like lines due to ground contact deformation by using dummy elements. Further, since the dummy elements are removed after the ground contact deformation, a space can be left inside the sipes of the tire model after the ground contact deformation. Thereby, it is possible to prevent problems in generating a space model around a tire having sipes and to improve the accuracy of the space model.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Mode for Carrying Out the Invention

[0012] Hereinafter, with reference to the drawings, an example of an embodiment of an apparatus, method, and program for generating a space model around a tire according to the present invention will be described in detail. The embodiments described below are merely examples, and the present invention is not limited to the following embodiments.

[0013] Hereinafter, with reference to FIGS. 1 to 5, an apparatus 1 for generating a space model around a tire, which is an embodiment of the present invention, will be described.

[0014] FIG. 1 is a side view showing a tire surrounding space model 10 according to an example of an embodiment. The tire surrounding space model 10 is a spatial acoustic model around the tire, and is a model obtained by dividing a predetermined space including a first space formed at the grounding portion of the tire and a second space outside the tire into a plurality of elements.

[0015] The tire surrounding space model 10 defines a space surrounded by a tire model 20, a road surface model 22, and an outermost surface 24 of the tire surrounding space. The tire surrounding space model 10 includes a first space model and a second space model. The first space model exists between a road surface boundary model 12 and the road surface model 22, and models a first space formed at the grounding portion of the tire. The road surface boundary model 12 is composed of a deformed tire model 20 and a road surface model 22.

[0016] The tire model 20 is in contact with the road surface model 22 in the contact area 20a. The tire model 20 is installed on a planar disk-shaped road surface model 22.

[0017] The outermost surface 24 of the tire surrounding space is hemispherical with the tire model 20 as the center, and is connected to the outer edge of the road surface model 22. In the present embodiment, the road surface model 22 is planar, but it may be curved. For example, when measuring noise with a drum type tester, the road surface model 22 can be made curved like the drum surface.

[0018] The second space model models a second space, which is a hemispherical space defined by the outermost surface 24 and the road surface model 22 outside the tire model 20.

[0019] FIG. 2 is a block diagram showing a generator 1 of a tire surrounding space model 10 according to an example of an embodiment. The generator 1 is configured by, for example, an information processing apparatus including a control device having a processor 41 and a memory 42. The information processing apparatus is configured by, for example, a computer including a processor 41, a memory 42, an input unit such as a keyboard for inputting data and execution instructions, and a display for outputting calculation results such as the generation result of the tire surrounding space model 10. The processor 41 executes arithmetic processing for controlling the generator 1. The memory 42 stores a control program for controlling the processor 41 and is configured by, for example, a RAM, a ROM, a hard disk, etc. The control program includes a program for causing the information processing apparatus to execute a method for generating the tire surrounding space model 10. The generator 1 may be configured by one information processing apparatus or may be configured by a plurality of information processing apparatuses.

[0020] The generator 1 includes a tire model creation unit 43, a grounding analysis unit 44, and a space model generation unit 46. The tire model creation unit 43 creates a tire model 20 which is a model obtained by dividing a tire into a plurality of elements. The tire model 20 includes data regarding the internal and external structures of the tire. Note that the tire model is not limited to an analysis model by the finite element method as described below, and may be an analysis model by, for example, the finite difference method (FDM), the boundary element method (BEM), etc.

[0021] The tire model 20 includes data on the magnitude of the contact pressure received by the elements from the drum. Further, the tire model 20 includes data on the position coordinates of the nodes of the elements and data on the partition line segments of the elements. Here, a node means a vertex of an element, and a partition line segment means a side that partitions an element.

[0022] In this embodiment, the tire includes a tread portion having a plurality of grooves. For example, the tire has circumferential grooves provided along the tire circumferential direction at a plurality of positions in the tire axial direction, or extending in a zigzag shape in the tire circumferential direction. The tread portion has a plurality of land portions spaced apart in the tire axial direction. The plurality of land portions protrude outward in the tire radial direction. Each of the plurality of land portions may be configured such that a plurality of blocks spaced apart in the tire circumferential direction are formed by a plurality of lug grooves crossing the tire circumferential direction.

[0023] Furthermore, on the ground contact surface of the land portion of the tire, sipe, which is a plurality of thin linear grooves having a groove width of a predetermined width or less as a minute groove width, is formed. The sipe is a groove having a smaller width than the circumferential groove and the lug groove. For example, it enhances the edge effect of scratching snow and ice, and realizes good driving and braking performance and handling stability on snow and ice road surfaces. One end or both ends of the sipe may open to the tire circumferential groove, or both ends of the sipe may not open to the tire circumferential groove and may be formed as a so-called closed sipe.

[0024] The tire model 20 described below will, as an example, describe the case of modeling a tire in which a plurality of land portions divided in the tire axial direction and extending over the entire circumference in the tire circumferential direction are provided in the tread portion, and each land portion has a sipe with one end opening to the tire circumferential groove. On the other hand, in the present invention, the shape of the tire to be modeled is not limited to such a tire. For example, the tire model may have a shape in which a plurality of blocks spaced apart in the tire circumferential direction are provided in the tread portion by a plurality of lug grooves, or the sipe may have a shape in which both ends open to the circumferential groove. Also, the shape of the sipe as viewed from the outside in the tire radial direction may include a linear shape, a curved shape, a polygonal line shape, and a wave shape.

[0025] FIG. 3 is an enlarged perspective view showing a state in which the dummy element 64 is filled in the groove of the tire model 20. The tire model 20 is created by the tire model creation unit 43. The tire model 20 has a plurality of circumferential grooves 50, 51, 52, 53 provided in the tread portion 21, a plurality of land portions 60, 61, 62, and a plurality of sipes 63 formed on the ground contact surface of each of the plurality of land portions 60, 61, 62. The plurality of land portions 60, 61, 62 are provided over the entire circumference of the tire model along the tire circumferential direction. One end of each sipe 63 opens into one of the tire circumferential grooves 50, 51, 52, 53. Each sipe 63 is a thin-line groove having a groove width of a predetermined width or less, and has a curved shape with a cross-sectional circular arc shape when viewed from the outer side in the tire radial direction. For example, the "predetermined width" is a length less than 2 mm, for example, a length of 1.99 mm or less.

[0026] In the present embodiment, the tire model creation unit 43 is set to fill the dummy element 64 in all the sipes 63 having a groove width of a predetermined width or less. The dummy element 64 is a temporary filling element set to prevent the groove-shaped space formed in the tread portion by the sipe 63 from becoming narrow and the sipe 63 from being completely closed and crushed into a linear shape during the ground contact deformation described later in the tire model 20. The above-mentioned "predetermined width" is the upper limit of the width of the sipe 63 that is expected in advance to be crushed into a linear shape by the ground contact deformation so that the wall surfaces at both ends in the width direction come into contact with each other. The "predetermined width" can be obtained, for example, by experiments or analysis. Further, the dummy element 64 is not defined to contact the road surface during the ground contact analysis. Note that, on the ground contact surface of the land portion of the tire model, relatively thin grooves having a groove width larger than the predetermined width and smaller than the groove widths of the circumferential groove and the lug groove may be set according to the shape of the actual tire, and the dummy element is not filled in those grooves.

[0027] When setting the dummy element 64 in a groove with a groove width equal to or less than a predetermined width, the predetermined width can be set in advance in the generator 1. Note that in the input unit of the generator 1, an input regarding the predetermined width by the user may be received, and the generator 1 may set the dummy element 64 in a groove with a groove width equal to or less than the input predetermined width. At this time, in the generator 1, the user may be able to select a predetermined width from among a plurality of preset groove widths by a pull-down method or the like.

[0028] The dummy element 64 is provided along the entire length of the sipe 63 and is in the form of a thin plate having a cross-sectional curved surface shape or a cross-sectional linear shape.

[0029] As the physical properties of the dummy element 64, it is preferable to satisfy one of the following (1) and (2). (1) The Young's modulus of the dummy element 64 is 0.1% or more and 1% or less of the rubber of the tread portion 21. (2) The Poisson's ratio of the dummy element 64 is 0 or more and 0.1 or less.

[0030] By setting the Young's modulus as in (1), it is possible to set the dummy element 64 that is softer than the rubber of the tread portion 21 and is easily crushed when the space formed in the tread portion by the sipe 63 becomes narrow. Thereby, when the tire model 20 filled with the dummy element 64 in the sipe 63 is subjected to ground deformation, it is possible to prevent the sipe 63 from being deformed in a direction to crush the space inside the sipe 63 by the inner dummy element 64. For this reason, while preventing the deformation of the sipe 63 from being inhibited by the dummy element 64 during ground deformation, the wall surfaces on both sides in the width direction of the sipe 63 come into contact with each other, the space formed in the tread portion by the sipe 63 becomes narrow, and the sipe 63 is deformed so as to be closed in a linear shape or the like and completely crushed. Therefore, it is possible to prevent a mesh generation error and deterioration of mesh quality during generation of the tire surrounding space model 10 described later.

[0031] When the Poisson's ratio is set as in (2), in the tread portion 21, when a force is applied in a direction to crush the space inside the sipe 63 from one side or both sides in the width direction of the sipe 63, the dummy element 64 can be set while preventing the dummy element 64 from extending in the longitudinal direction as much as possible. Thereby, when the tire model 20 filled with the dummy element 64 in the sipe 63 is in contact with the ground and deformed, when the sipe 63 is deformed in the width direction in a direction to crush the sipe 63 so that the space formed in the tread portion by the sipe 63 becomes narrower, the presence of the dummy element 64 can prevent the sipe 63 from extending in the longitudinal direction.

[0032] Also, when the tire model 20 is in contact with the ground and deformed, when the space formed in the tread portion by the sipe 63 becomes narrower and the sipe 63 is deformed in the longitudinal direction in a direction to crush the sipe 63, the presence of the dummy element 64 can prevent the sipe 63 from extending in the width direction.

[0033] Thereby, while preventing the deformation of the sipe 63 from being inhibited by the dummy element 64 during contact deformation, similar to (1), it is possible to prevent the sipe 63 from being deformed so that the space formed in the tread portion by the sipe 63 becomes narrower and the sipe becomes linear and is completely crushed. This can also prevent mesh generation errors and deterioration of mesh quality during the generation of the tire surrounding space model 10.

[0034] From the aspect of preventing the above-mentioned mesh generation errors and deterioration of mesh quality, it is more preferable that the physical properties of the dummy element 64 satisfy both (1) and (2).

[0035] The contact analysis unit 44 performs a contact analysis on a state where a predetermined load is applied on a road surface with a predetermined shape using the above-mentioned tire model 20.

[0036] The space model generation unit 46 includes a post-contact-analysis tire extraction unit 47, a boundary specifying unit 48, and a space modeling unit 49.

[0037] The grounded analysis post-tire extraction unit 47 extracts the surface of the tire model after dummy removal, which excludes all of the dummy elements 64 from the treads 63 of the tire model 20 after ground deformation. As a result, when generating the tire surrounding space model 10 in the space modeling unit 49 described later, it is possible to model including the space of the tread portion formed by the treads 63 of the tire model 20.

[0038] Furthermore, the space model generation unit 46 creates a road surface model 22 having a contact portion with the tire using the results of the ground contact analysis. The space model generation unit 46 creates a road surface boundary model 12 from the created road surface model 22. First, when creating the road surface model 22, the contour of the contact area 20a that contacts the road surface in the tire model 20 is specified. Also, in creating the road surface model 22, a road surface having the same shape as that used in the ground contact analysis is simulated, and a road surface model 22 that has a road surface contacting the contact area 20a and is divided into a plurality of elements is created.

[0039] Next, the space model generation unit 46 creates a projection view in which the specified contour of the contact area 20a is projected onto the road surface model 22 from above, and creates a road surface model 22 from which the portion corresponding to the projection view is deleted from the road surface model 22. The space model generation unit 46 creates the road surface model 22, for example, by dividing the road surface from which the portion corresponding to the projection view is deleted into a plurality of elements.

[0040] The space model generation unit 46 generates a road surface boundary model 12 by connecting the tire model 20 and the road surface model 22. The space model generation unit 46 creates a continuous road surface boundary model 12 by connecting the nodes of the elements of the approaching tire model 20 and the nodes of the road surface model 22 in the vicinity of the contact area 20a. Since the contour of the contact area 20a is composed of a broken line based on the elements of the tire model 20, it is easy to connect the nodes of the elements of the tire model 20 and the nodes of the road surface model 22.

[0041] FIG. 4 is a side view of the vicinity of the contact area 20a of the tire model 20. In FIG. 4, it shows that the nodes of the elements of the tire model 20 and the nodes of the road surface model 22 are connected at the positions indicated by the plurality of black circles in the contact area 20a.

[0042] Furthermore, the boundary designating unit 48 of the space model generation unit 46 designates a boundary for modeling the space. Specifically, the boundary designating unit 48 sets, above the road surface model 22, a hemispherical shape centered on the tire model 20 and having an outermost surface 24 connected to the outer edge of the road surface model 22. The outermost surface 24 is an acoustic impedance boundary in the space above the road surface.

[0043] Then, the space modeling unit 49 divides a predetermined space in which a first space model formed at the grounding portion and a second space model having a predetermined shape outside the tire model 20 are connected, based on the grounding shape of the tire model 20, into a plurality of elements to generate a tire surrounding space model 10. The tire surrounding space model 10 is a model that models a space filled with gas around the tire, and is an analysis model by the finite element method.

[0044] The first space is a space formed at the grounding portion between the tire model 20 and the road surface, and is a space formed between the circumferential grooves and lug grooves of the tire and the road surface. The second space is a space connected to the first space, and is a space around the tire excluding the tire portion.

[0045] Note that the tire surrounding space model 10 is not limited to an analysis model by the finite element method, and may be an analysis model by the finite difference method, the boundary element method, or the like. Also, depending on the boundary conditions and the like, the most appropriate analysis method may be selected, or an analysis model combining a plurality of analysis methods may be used.

[0046] Hereinafter, with reference to FIG. 5, a method for generating the tire surrounding space model 10 using the above-described generation device 1 will be described.

[0047] FIG. 5 is a flowchart of a method for generating a tire surrounding space model 10 according to an example of an embodiment. First, a tire model creation unit 43 creates a tire model 20 by dividing a tire having a plurality of grooves in a tread portion 21 (FIG. 3) into a plurality of elements (S1). Next, the tire model creation unit 43 sets to fill all of the sipes 63 having a groove width equal to or less than a predetermined width in the tread portion 21 with dummy elements 64 (S2). At this time, as physical properties of the dummy elements 64, one or both of setting the Young's modulus of the dummy elements 64 to be 0.1% or more and 1% or less of the rubber in the tread portion and setting the Poisson's ratio of the dummy elements 64 to be 0 or more and 0.1 or less can be set.

[0048] Then, a grounding analysis unit 44 performs a grounding analysis on the tire model 20 grounded on a road surface and obtains a deformed tire model 20 (S3). The road surface shape and the magnitude of the load during the grounding analysis can be arbitrarily set.

[0049] Next, an extracted tire after grounding analysis unit 47 of a space model generation unit 46 extracts the surface of a tire model after removing dummies excluding the dummy elements 64 from the tire model 20 after grounding deformation (S4).

[0050] Also, the space model generation unit 46 creates a road surface model 22 having a grounding portion with the tire by using the result of the grounding analysis, and creates a road surface boundary model 12 from the created road surface model 22.

[0051] Also, a boundary specifying unit 48 of the space model designates the outermost surface 24 as an acoustic impedance boundary (S4).

[0052] Then, a space modeling unit 49 generates a tire surrounding space model 10 in which a first space model and a second space model are connected (S5), and the method for generating the tire surrounding space model 10 ends.

[0053] After that, acoustic analysis is performed using the generated tire surrounding space model 10. The acoustic analysis can be performed using analysis software that employs the finite element method. In this acoustic analysis, for example, the boundary condition of the outermost surface 24 is set to perfect radiation, and the boundary conditions of the outer peripheral portion of the tire and the floor surface are set to perfect reflection.

[0054] Also, as an arbitrary point near the circumferential groove or lug groove in the contact portion, an input point for inputting the radiated sound generated from the space formed between the groove and the road surface is set. Then, for example, acoustic analysis is performed by steady response analysis or time series response analysis. In the steady response analysis, the amplitude value of the sound pressure or the particle velocity of the gas can be set for each frequency of the radiated sound to be analyzed at an arbitrary input point. In the time series response analysis, the time-varying sound pressure or particle velocity can be set at an arbitrary input point.

[0055] For example, the frequency of the radiated sound input to the input point is changed within a predetermined frequency range, and steady response analysis is performed. Then, as an arbitrary position within the tire surrounding space model 10, an observation point for observing the radiated sound is set. Then, data on the sound pressure for each frequency of the radiated sound at the observation point is acquired. For example, data on the transfer function of the sound pressure for each frequency of the radiated sound at the observation point is acquired. The transfer function is the ratio (P / Q) of the sound pressure P at the observation point to the volume velocity Q at the input point.

[0056] According to the above-described generation device 1, generation method, and program, when creating a tire model for a tire having the sipe 63 with a minute groove width in the tread portion, it is possible to prevent the sipe from being crushed by the dummy element 64 so that the sipe becomes linear or the like due to the contact deformation. Further, since the dummy element 64 is removed after the contact deformation, the space formed in the tread portion by the sipe 63 of the tire model 20 after the contact deformation can be left. Thereby, it is possible to prevent a generation defect of the tire surrounding space model 10 having the sipe 63 and to improve the accuracy of the tire surrounding space model 10.

[0057] The present disclosure will be further described by the following embodiments. Configuration 1: A tire model creation unit that creates a tire model by dividing a tire having a plurality of grooves in a tread portion into a plurality of elements, A grounding analysis unit that performs a grounding analysis on a state in which a predetermined load is applied using the tire model, and obtains the deformed tire model, A space model generation unit that generates a space model by dividing a predetermined space including a first space formed in a grounding portion and a second space having a predetermined shape outside the tire model into a plurality of elements based on the grounding shape of the tire model, and is provided with, The tire model creation unit is set to fill a dummy element in a sip that is the groove among the plurality of grooves having a groove width equal to or less than a predetermined width, The space model generation unit extracts the surface of the tire model after removing the dummy element from the tire model after grounding deformation, A device for generating a space model around a tire. Configuration 2: The Young's modulus of the dummy element is 0.1% or more and 1% or less of the rubber of the tread portion, The device for generating a space model around a tire according to Configuration 1. Configuration 3: The Poisson's ratio of the dummy element is 0 or more and 0.1 or less, The device for generating a space model around a tire according to Configuration 1 or Configuration 2. Configuration 4: A step of creating a tire model by dividing a tire having a plurality of grooves in a tread portion into a plurality of elements, A step of performing a grounding analysis on a state in which a predetermined load is applied using the tire model, and obtaining the deformed tire model, A step of generating a space model by dividing a predetermined space including a first space formed in a grounding portion and a second space having a predetermined shape outside the tire into a plurality of elements based on the grounding shape of the tire model, and has, The step of creating the tire model is set to fill a dummy element in a sip that is the groove among the plurality of grooves having a groove width equal to or less than a predetermined width, The step of generating the spatial model is a method for generating a spatial model around a tire, which extracts the surface of the tire model after dummy removal obtained by removing the dummy elements from the tire model after ground deformation. Configuration 5: The Young's modulus of the dummy element is 0.1% or more and 1% or less of the rubber in the tread portion. The method for generating a spatial model around a tire according to Configuration 4. Configuration 6: The Poisson's ratio of the dummy element is 0 or more and 0.1 or less. The method for generating a spatial model around a tire according to Configuration 4 or Configuration 5. Configuration 7: A program for causing a computer to execute the method according to any one of Configurations 4 to 6.

Explanation of Signs

[0058] 1 Generation device, 10 Spatial model around tire, 12 Road surface boundary model, 20 Tire model, 20a Contact area, 22 Road surface model, 24 Outermost surface, 41 Processor, 42 Memory, 43 Tire model creation unit, 44 Ground contact analysis unit, 46 Spatial model generation unit, 47 Tire extraction unit after ground contact analysis, 48 Boundary specification unit, 49 Spatial modeling unit, 50, 51, 52, 53 Circumferential grooves, 60, 61, 62 Land portions, 63 Sipes, 64 Dummy element.

Claims

1. A tire model creation unit that creates a tire model by dividing a tire having a plurality of grooves in a tread portion into a plurality of elements, A grounding analysis unit that performs a grounding analysis on a state where a predetermined load is applied using the tire model and obtains the deformed tire model, A space model generation unit that generates a space model by dividing a predetermined space including a first space formed in a grounding portion and a second space having a predetermined shape outside the tire model into a plurality of elements based on the grounding shape of the tire model, and comprising, The tire model creation unit is set to fill a dummy element in a sip that is a groove among the plurality of grooves and has a groove width equal to or less than a predetermined width, The space model generation unit extracts the surface of the tire model after dummy removal obtained by removing the dummy element from the tire model after grounding deformation, A device for generating a space model around a tire.

2. The Young's modulus of the dummy element is 0.1% or more and 1% or less of the rubber of the tread portion, The device for generating a space model around a tire according to Claim 1.

3. The Poisson's ratio of the dummy element is 0 or more and 0.1 or less, The device for generating a space model around a tire according to Claim 1.

4. A step of creating a tire model by dividing a tire having a plurality of grooves in a tread portion into a plurality of elements, A step of performing a grounding analysis on a state where a predetermined load is applied using the tire model and obtaining the deformed tire model, A step of generating a space model by dividing a predetermined space including a first space formed in a grounding portion and a second space having a predetermined shape outside the tire into a plurality of elements based on the grounding shape of the tire model, and having, The step of creating the tire model is set to fill a dummy element in a sip that is a groove among the plurality of grooves and has a groove width equal to or less than a predetermined width, The step of generating the space model extracts the surface of the tire model after dummy removal obtained by removing the dummy element from the tire model after grounding deformation, A method for generating a space model around a tire.

5. The Young's modulus of the dummy element is 0.1% or more and 1% or less of the rubber of the tread portion, The method for generating a space model around a tire according to Claim 4.

6. The Poisson's ratio of the dummy element is 0 or more and 0.1 or less, The method for generating a space model around a tire according to Claim 4.

7. A program for causing a computer to execute the method according to claim 4.

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