CN112199790B - Regular polyhedron porous heel area filling structure sole and design method thereof - Google Patents
Regular polyhedron porous heel area filling structure sole and design method thereof Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 28
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- 230000011218 segmentation Effects 0.000 claims description 3
- 210000002435 tendon Anatomy 0.000 claims description 3
- 238000013334 tissue model Methods 0.000 claims description 3
- 210000000474 heel Anatomy 0.000 description 45
- 210000002683 foot Anatomy 0.000 description 16
- 230000035939 shock Effects 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 210000000459 calcaneus Anatomy 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000037182 bone density Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
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- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/14—Soles; Sole-and-heel integral units characterised by the constructive form
- A43B13/18—Resilient soles
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- G—PHYSICS
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
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- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
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Abstract
The invention discloses a design method of a regular polyhedron porous heel area filling structure sole, which comprises the following steps: step S1, establishing a sole model; s2, respectively establishing a plurality of different regular polyhedron porous structure models in the heel area of the sole; step S3, setting different parameters for the porous structures in the sole models of the porous filling structures of the various different front bodies respectively so as to obtain three groups of sole models of the porous filling structures of the heel areas with different porosities and the same porous type; s4, constructing a plurality of groups of foot-sole system three-dimensional models of soles with different porosities and porous filling structures of the same porous type; s5, performing dynamic analysis on the three-dimensional model; and S6, comparing the data of different porosities and different soles to obtain the optimal porous filling structure sole optimization structure. The invention also provides a regular polyhedron porous heel area filling structure sole.
Description
Technical Field
The invention relates to an optimal design method, in particular to a design method of a porous regular polyhedron filling structure sole.
Background
The shoes are an important shock absorption and buffering tool for people in the walking process, and have a critical effect on foot shock absorption and protection. The experimental method for researching the shock absorption performance of the foot shoes has a plurality of defects, such as long experimental period, high cost and the like. Accordingly, more and more researchers have begun to utilize computer to study the shock absorbing performance of footwear using the finite element method.
Disclosure of Invention
The invention aims to solve the main technical problems of providing a method for researching the cushioning performance of the sole in the foot motion process and the optimal design of the porous filling structure sole in the heel area based on an energy method and a finite element method, which can provide theoretical guidance and reference for the manufacture and design of the sole.
In order to solve the technical problems, the invention provides an optimal design method of a regular polyhedron porous heel area filling structure sole, which comprises the following steps:
Step S1, establishing a sole model;
s2, selecting a sole heel area as a sole optimal design area, respectively establishing a plurality of different regular polyhedron porous structure models in the sole heel area to obtain a plurality of regular polyhedron porous filling structure sole models in the heel area;
Step S3, setting different parameters for the porous structures in the multi-hole-shaped porous filling structure sole models of the heel areas respectively to obtain a plurality of groups of multi-hole-shaped porous filling structure sole models of the heel areas with different porosities and the same hole type;
Step S4, building a foot finite element model containing bones, soft tissues and tendons, and assembling the foot finite element model with a plurality of groups of heel area regular polyhedron porous filling structure sole models with different porosities and same pore types together to respectively obtain a plurality of groups of foot-sole system three-dimensional models of porous filling structure soles with different porosities and same pore types;
s5, introducing a plurality of groups of foot-sole system three-dimensional models of soles with different porosities and same porous type into ABAQUS, performing grid division and boundary condition setting, and performing dynamic analysis to obtain stress, displacement and strain energy of the soles;
And S6, comparing the data of the maximum strain energy, the maximum stress, the maximum displacement and the like of the soles with different porosities and different porous structure types to obtain the optimal porous filling structure sole optimization structure.
In a preferred embodiment, the step S2 specifically includes:
Step S21: setting a sole heel area in UG;
Step S22: selecting a heel area of the sole as a porous structure filling area, and establishing a plurality of regular polyhedron array filling models of the heel areas in the area to obtain a plurality of porous heel area filling structure sole models;
The establishment rule of the regular polyhedron array filling models of the heel areas is that the regular polyhedron models with the side length of a are arrayed at the interval d, so that a sole model of the multi-hole heel area filling structure of the regular polyhedron is obtained; the multiple regular polyhedrons have different side lengths in the porous heel area filling structure sole model.
In a preferred embodiment, the step S3 specifically includes:
Step S31: respectively making a plurality of groups of combinations of regular polyhedron side length a and array spacing d;
Step S32: step 2 is repeatedly executed, so that each heel area regular polyhedron porous filling structure sole model is provided with a group of heel area regular polyhedron porous filling structure sole models with different porosities and same pore types respectively.
In a preferred embodiment, the step S4 specifically includes:
Step S41: CT scanning data of the foot are obtained by utilizing a CT scanning technology;
Step S42: importing foot CT scan data into medical software MIMICS, and establishing a rough foot entity model through corresponding mask extraction, threshold segmentation, region growing, mask editing and 3D computing operations;
step S43: adopting polygonal processing, curved surface construction, curved surface refinement and fairing processing operation in Geomagic Studio to establish a fairing foot bone model;
Step S44: and (3) introducing the foot bone model into UG, constructing a soft tissue model in UG, and finally assembling the foot complete model with a plurality of groups of heel area regular polyhedron porous filling structure sole models with different porosities and the same pore type to form a foot-sole system three-dimensional model of a plurality of groups of porous filling structure soles with different porosities and the same pore type.
In a preferred embodiment, the step S5 specifically includes:
Step S51: performing material attribute giving, meshing and contact setting in an ABAQUS (matrix-forming matrix) in the three-dimensional model of the foot-sole system of the multi-group porous filling structure sole with different porosities and the same porous types in the step S4;
step S52: setting boundary conditions and load application of a system model, simulating the motion process of a foot-sole system, and performing dynamic analysis;
Step S53: and after analysis is completed, obtaining the maximum strain energy, the maximum stress and the maximum displacement data of the sole.
In a preferred embodiment, the step S6 specifically includes:
step S61: respectively comparing the maximum strain energy, the maximum stress and the maximum displacement of soles with different porosities and the same porous structure type to obtain the optimal structure of the sole with different porous structure types;
step S62: comparing the maximum strain energy, the maximum stress and the maximum displacement of the sole optimal structure with different porous structure types and different porous structure types in the step S61 to obtain the optimal sole optimal structure with the porous filling structure.
The present invention also provides a regular polyhedron porous heel area filling structure sole comprising: a sole body; the sole body is filled with hollow regular polyhedrons arranged in an array in the heel area of the sole.
In a preferred embodiment: the porosity of the regular polyhedron array is 1.2%, and the regular polyhedron is regular tetrahedron.
Compared with the prior art, the invention has the following beneficial effects:
1) The sole model with the regular polyhedron porous filling structure in the heel area is provided, and the sole model with the regular polyhedron porous filling structure in the heel area with different porosities and the same porous type is obtained by changing relevant parameters of the porous structure;
2) Numerical simulation is carried out on the foot motion process by a finite element analysis method, and the maximum strain energy, the maximum stress and the maximum displacement data of the porous filling structure sole model in the process are obtained.
3) And comparing the maximum strain energy, the maximum stress and the maximum displacement of the regular polyhedron porous filling structure sole model with different porosities and the same porous types to obtain the optimal regular polyhedron porous filling structure sole optimization structure.
4) The sole analysis performed by the method can provide guiding significance for the design and production of soles.
Drawings
FIG. 1 is a schematic flow chart of main steps of a method in a preferred embodiment of the invention;
FIG. 2 is a diagram of a preferred embodiment of the present invention of a sole model with a porous filling structure;
FIG. 3 is a three-dimensional model of the foot-sole system in accordance with the preferred embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments, and that all other embodiments obtained by persons of ordinary skill in the art without making creative efforts based on the embodiments in the present invention are within the protection scope of the present invention.
In the description of the present invention, it should be noted that the positional or positional relationship indicated by the terms such as "upper", "lower", "inner", "outer", "top/bottom", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "provided," "engaged/connected," "connected," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, may be a detachable connection, or may be an integral connection, may be a mechanical connection, may be an electrical connection, may be a direct connection, may be an indirect connection via an intermediary, may be a communication between two elements, and for one of ordinary skill in the art, the specific meaning of the terms in this disclosure may be understood in a specific case.
Referring to fig. 1-3, a method for optimally designing a sole of a regular polyhedron porous heel region filling structure, comprising:
Step S1, establishing a sole model;
Step S2, selecting a sole heel area as a sole optimal design area, establishing three different regular polyhedron porous structure models in the sole heel area respectively, and obtaining three regular polyhedron porous filling structure sole models M1, M2 and M3 of the heel area, wherein the method specifically comprises the following steps:
Step S21: setting a sole heel area in UG;
Step S22: constructing a regular tetrahedron model with a side length of a1, arranging the regular tetrahedron models according to a spacing d1, and performing Boolean subtraction operation on the regular tetrahedron model and a heel area of the sole to obtain a heel area regular tetrahedron porous filling structure sole model M1;
step S23: constructing a regular hexahedral model with a side length of a2, arranging the regular hexahedral models according to a spacing d2, and performing Boolean subtraction operation on the regular hexahedral model and a heel area of the sole to obtain a heel area regular hexahedral porous filling structure sole model M2;
step S24: an regular octahedral model with a3 side length is constructed, and is arrayed according to a distance d3, and then Boolean subtraction operation is carried out on the regular octahedral model and the heel area of the sole, so that the sole model M3 with the heel area regular octahedral porous filling structure is obtained.
Step S3, setting different parameters for the porous structures in the three porous filling structure sole models respectively to obtain three groups of porous filling structure sole models with different porosities and same porous type and regular polyhedron in the heel area, wherein the porous filling structure sole models specifically comprise:
Step S31: respectively making a plurality of groups of combinations of regular polyhedron side length a and array spacing d;
Step S32: repeatedly executing the step S22, and calculating the porosity of the heel area to obtain a plurality of heel area regular tetrahedron porous filling structure sole models with different porosities;
Step S33: repeatedly executing the step S23, and calculating the porosity of the heel area to obtain a plurality of heel area regular hexahedral porous filling structure sole models with different porosities;
Step S34: step S24 is repeatedly performed, and the heel region porosities are calculated, so as to obtain a plurality of heel region regular octahedron porous filling structure sole models with different porosities.
Step S4: constructing a foot finite element model containing bones, soft tissues and tendons in ABAQUS, and assembling the foot finite element model with three groups of heel area regular polyhedron porous filling structure sole models with different porosities and same pore types to obtain a foot-sole system three-dimensional model of a plurality of groups of porous filling structure soles with different porosities and same pore types, wherein the foot-sole system three-dimensional model specifically comprises:
Step S41: CT scanning data of the foot are obtained by utilizing a CT scanning technology;
Step S42: importing foot CT scan data into medical software MIMICS, and establishing a rough foot entity model through corresponding mask extraction, threshold segmentation, region growing, mask editing and 3D computing operations;
step S43: adopting polygonal processing, curved surface construction, curved surface refinement and fairing processing operation in Geomagic Studio to establish a fairing foot bone model;
Step S44: and (3) introducing the foot bone model into UG, constructing a soft tissue model in UG, and finally assembling the foot complete model with a plurality of groups of heel area regular polyhedron porous filling structure sole models with different porosities and the same pore type to form a foot-sole system three-dimensional model of a plurality of groups of porous filling structure soles with different porosities and the same pore type.
Step S5: introducing a plurality of groups of foot-sole system three-dimensional models of soles with different porosities and same porous types into ABAQUS, performing grid division and boundary condition setting, and performing a dynamic analysis to obtain stress, displacement and strain energy of the soles; the method specifically comprises the following steps:
Step S51: performing material attribute giving, meshing and contact setting in an ABAQUS (matrix-forming matrix) in the three-dimensional model of the foot-sole system of the multi-group porous filling structure sole with different porosities and the same porous types in the step S4;
Specifically, the calcaneus bone density is set to 1500kg/m 3, the elastic modulus is set to 7300MPa, and the Poisson's ratio is set to 0.3; the soft tissue density was set at 937kg/m 3, the elastic modulus was set at 0.45MPa, and the Poisson's ratio was set at 0.48; the sole density was set at 1230kg/m 3, the modulus of elasticity was set at 4MPa, and the Poisson's ratio was set at 0.4. The soft tissue is in surface-to-surface contact with the sole, and the friction coefficient is 0.6; calcaneus and soft tissue are placed in Tie contact.
Step S52: setting boundary conditions and load application of a system model, simulating the motion process of a foot-sole system, and performing dynamic analysis;
Specifically, the sole has only three degrees of freedom constraints for the bottom surface, namely: x=0, y=0, z=0, the upper end surface of the sole is set to be in surface-to-surface contact with the soft tissue, and the friction coefficient is 0.6; and setting boundary conditions consistent with actual conditions, and completing dynamic simulation analysis of the finite element model of the sole.
Step S53: and after analysis is completed, obtaining the maximum strain energy, the maximum stress and the maximum displacement data of the sole.
Step S6: comparing the data of maximum strain energy, maximum stress, maximum displacement and the like of soles with different porosities and different porous structure types to obtain the optimal porous filling structure, wherein the optimal structure comprises the following concrete steps:
step S61: respectively comparing the maximum strain energy, the maximum stress and the maximum displacement of soles with different porosities and the same porous structure type to obtain the optimal structure of the sole with different porous structure types;
Step S62: comparing the maximum strain energy, the maximum stress and the maximum displacement of the optimal structure of the sole with different porous structure types and different porous structure types in the step S61 to obtain the optimal structure of the sole with the porous filling structure, namely a regular tetrahedral porous filling structure sole model with the porosity of 1.2%, as shown in fig. 2.
In this embodiment, taking three heel area regular polyhedron porous filling structure sole models as an example, as a simple alternative of this embodiment, the number of heel area regular polyhedron porous filling structure sole models may also be four or more, which only needs to be simply increased on the basis of this embodiment.
The above description is only of the preferred embodiments of the present invention; the scope of the invention is not limited in this respect. Any person skilled in the art, within the technical scope of the present disclosure, may apply to the present invention, and the technical solution and the improvement thereof are all covered by the protection scope of the present invention.
Claims (6)
1. The method for optimally designing the sole of the regular polyhedron porous heel area filling structure is characterized by comprising the following steps of:
Step S1, establishing a sole model;
s2, selecting a sole heel area as a sole optimal design area, respectively establishing a plurality of different regular polyhedron porous structure models in the sole heel area to obtain a plurality of regular polyhedron porous filling structure sole models in the heel area;
Step S3, setting different parameters for the porous structures in the multi-hole-shaped porous filling structure sole models of the heel areas respectively to obtain a plurality of groups of multi-hole-shaped porous filling structure sole models of the heel areas with different porosities and the same hole type;
Step S4, building a foot finite element model containing bones, soft tissues and tendons, and assembling the foot finite element model with a plurality of groups of heel area regular polyhedron porous filling structure sole models with different porosities and same pore types together to respectively obtain a plurality of groups of foot-sole system three-dimensional models of porous filling structure soles with different porosities and same pore types;
s5, introducing a plurality of groups of foot-sole system three-dimensional models of soles with different porosities and same porous type into ABAQUS, performing grid division and boundary condition setting, and performing dynamic analysis to obtain stress, displacement and strain energy of the soles;
And S6, comparing the maximum strain energy, the maximum stress and the maximum displacement data of the soles with different porosities and different porous structure types to obtain the optimal porous filling structure sole optimization structure.
2. The method for optimally designing a regular polyhedron porous heel area filling structure sole according to claim 1, wherein the step S2 specifically comprises:
Step S21: setting a sole heel area in UG;
step S22: selecting a heel area of the sole as a porous structure filling area, and establishing a plurality of heel area regular polyhedron array filling models in the area to obtain a plurality of porous heel area filling structure sole models;
The establishment rule of the regular polyhedron array filling models of the heel areas is that the regular polyhedron models with the side length of a are arrayed at the interval d, so that a sole model of the multi-hole heel area filling structure of the regular polyhedron is obtained; the multiple regular polyhedrons have different side lengths in the porous heel area filling structure sole model.
3. The method for optimally designing a regular polyhedron porous heel area filling structure sole according to claim 1, wherein the step S3 specifically comprises:
Step S31: respectively making a plurality of groups of combinations of regular polyhedron side length a and array spacing d;
Step S32: step 2 is repeatedly executed, so that each heel area regular polyhedron porous filling structure sole model is provided with a group of heel area regular polyhedron porous filling structure sole models with different porosities and same pore types respectively.
4. The method for optimally designing a regular polyhedron porous heel area filling structure sole according to claim 1, wherein the step S4 specifically comprises:
Step S41: CT scanning data of the foot are obtained by utilizing a CT scanning technology;
step S42: importing foot CT scan data into medical software MIMICS, and establishing a rough foot entity model through corresponding mask extraction, threshold segmentation, region growing, mask editing and 3D computing operations;
step S43: adopting polygonal processing, curved surface construction, curved surface refinement and fairing processing operation in Geomagic Studio to establish a fairing foot bone model;
Step S44: and (3) introducing the foot bone model into UG, constructing a soft tissue model in UG, and finally assembling the foot complete model with a plurality of groups of heel area regular polyhedron porous filling structure sole models with different porosities and the same pore type to form a foot-sole system three-dimensional model of a plurality of groups of porous filling structure soles with different porosities and the same pore type.
5. The method for optimally designing a regular polyhedron porous heel area filling structure sole according to claim 1, wherein the step S5 specifically comprises:
Step S51: importing the three-dimensional model of the foot-sole system of the multi-group porous filling structure sole with different porosities and the same porous type in the step S4 into ABAQUS, and carrying out material attribute giving, grid division and contact setting in the ABAQUS;
step S52: setting boundary conditions and load application of a system model, simulating the motion process of a foot-sole system, and performing dynamic analysis;
Step S53: and after analysis is completed, obtaining the maximum strain energy, the maximum stress and the maximum displacement data of the sole.
6. The method for optimally designing a regular polyhedron porous heel area filling structure sole according to claim 1, wherein the step S6 specifically comprises:
step S61: respectively comparing the maximum strain energy, the maximum stress and the maximum displacement of soles with different porosities and the same porous structure type to obtain the optimal structure of the sole with different porous structure types;
step S62: comparing the maximum strain energy, the maximum stress and the maximum displacement of the sole optimal structure with different porous structure types and different porous structure types in the step S61 to obtain the optimal sole optimal structure with the porous filling structure.
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| US11514349B1 (en) * | 2020-06-15 | 2022-11-29 | Topia Limited | Apparatus and methods of unsupervised machine learning models to identify seasonality and predicting seasonally-influenced metric values |
| CN113987857A (en) * | 2021-09-28 | 2022-01-28 | 华侨大学 | A three-layer uniform medium laminated shoe sole structure optimization design method |
| CN113657008B (en) * | 2021-09-28 | 2025-02-07 | 华侨大学 | An optimization design method for vibration reduction structure in the heel area of the sole based on mechanical admittance |
| CN114330040B (en) * | 2021-09-28 | 2024-07-26 | 华侨大学 | Sole vibration transfer characteristic analysis method |
| CN113821958A (en) * | 2021-09-28 | 2021-12-21 | 华侨大学 | A kind of optimal design method for cushioning multicellular sole structure |
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