Knitted fabric modeling method and system, computer equipment and program product

Abstract

The invention relates to a knitted fabric modeling method and system, computer equipment and a program product, and the modeling method comprises the steps: calculating the radius used by a model according to the actually measured radius, transverse density, longitudinal density and thickness of plied yarns of a knitted fabric, and calculating the coordinates of each type value point of a knitted fabric coil according to the radius used by the model; calculating control point coordinates of a center line of the knitted fabric coil and a center line equation according to the coordinates of all the type value points; calculating the distance between the midline equation and the control point, and mapping each control point and section information of the plied yarn to the midline of the knitted fabric; and outputting the knitted fabric model, and establishing a fabric-air system model by using Boolean operation. The universal relation between the knitted fabric structure parameters and the radius is established by observing and measuring a large number of knitted fabrics, the radius is inversely calculated through the known structure parameters, the accuracy of the model is improved, and convenience and rapidness are achieved.

Description

Technical Field

[0001] The present application relates to the field of knitting technology, and in particular to a modeling method, system, computer device and program product for knitted fabrics. Background Art

[0002] In the current knitted fabric modeling, although some progress has been made, the mainstream modeling methods still have significant limitations. Most of the current models ignore the texture of the strands and simplify the twisted strands into a cylindrical model (i.e., ignoring the influence of twist). Using this model for simulation can easily cause large simulation errors for models with large twist.

[0003] The knitted fabric structure is arranged periodically, and its smallest structural unit is the coil. Most of the current coil unit models use the method of using the shape value points in the NURBS curve to inversely calculate the control points and control curves. However, the current method for selecting shape value points is to observe the fabric through a microscope and sample special vertices, interweaving points, and feature points. However, when there are many types of experimental samples, it is necessary to repeatedly use a microscope to record the shape value points (special vertices, interweaving points, feature points), which increases the cost and time of the experiment. Summary of the invention

[0004] Based on this, it is necessary to provide a knitted fabric modeling method, system, computer equipment and program product to address the above technical problems, which can quickly build models and improve model accuracy.

[0005] In a first aspect, the present application provides a modeling method for a knitted fabric, the modeling method comprising:

[0006] Calculate the radius used by the model according to the measured radius, transverse density, longitudinal density and thickness of the strands of the knitted fabric, and calculate the coordinates of each type value point of the loop of the knitted fabric according to the radius used by the model;

[0007] Calculate the coordinates of the center line control points and the center line equation of the knitted fabric loop according to the coordinates of each value point;

[0008] Calculating the distance between the centerline equation and the control point, and mapping each control point and cross-sectional information of the strand to the centerline of the knitted fabric;

[0009] The knitted fabric model was exported and the fabric-air system model was established using Boolean operations.

[0010] In one embodiment, the step of calculating the radius used for the model according to the measured radius, transverse density, longitudinal density and thickness of the strands of the knitted fabric further includes:

[0011] Calculate a first radius using the measured radius and the horizontal density;

[0012] Calculating a second radius through the longitudinal density;

[0013] calculating a third radius using the thickness;

[0014] The radius used by the model is obtained by averaging the sum of the measured radius, the first radius, the second radius and the third radius.

[0015] In one embodiment, the step of calculating the coordinates of the center line control points and the center line equation of the knitted fabric loop according to the coordinates of each type value point also includes:

[0016] The coordinates of the center line control points of the knitted fabric loops and the center line equation are calculated using a NURBS type value point back-calculation control point algorithm.

[0017] In one embodiment, the step of calculating the distance between the centerline equation and the control point, and mapping each control point and cross-sectional information of the strand to the centerline of the knitted fabric further includes:

[0018] It is determined whether the distance is greater than a preset distance threshold. If the result of the determination is yes, each control point and cross-sectional information of the strand is mapped onto the center line of the knitted fabric.

[0019] In one embodiment, the step of determining whether the distance is greater than a preset distance threshold further includes:

[0020] It is determined whether the distance is greater than the cumulative sum of arc lengths between control points in any segment of the target curve.

[0021] In one embodiment, the modeling method further comprises:

[0022] The knitted fabric is introduced into finite element software to simulate the heat transfer of the knitted fabric when the human body contacts the knitted fabric, and the heat conduction condition is added to the fabric-air system model.

[0023] In one embodiment, the step of simulating the heat transfer of the knitted fabric when the human body contacts the knitted fabric comprises:

[0024] Setting the yarn of the knitted fabric to be an isotropic material;

[0025] The four sides of the knitted fabric are insulated, and there is no heat flow exchange with the environment. Heat convection and heat radiation only exist on the surface of the knitted fabric.

[0026] In a second aspect, an embodiment of the present application provides a modeling system for knitted fabrics, characterized in that the modeling system comprises:

[0027] A first calculation module is used to calculate the radius used by the model according to the measured radius, transverse density, longitudinal density and thickness of the strands of the knitted fabric, and calculate the coordinates of each type value point of the loop of the knitted fabric according to the radius used by the model;

[0028] A second calculation module is used to calculate the coordinates of the center line control point and the center line equation of the knitted fabric loop according to the coordinates of each type value point;

[0029] A third calculation module, used for calculating the distance between the center line equation and the control point, and mapping each control point and cross-section information of the strand to the center line of the knitted fabric;

[0030] A module is built to output knitted fabric models and to build fabric-air system models using Boolean operations.

[0031] In a third aspect, an embodiment of the present application provides a computer device, which includes a memory and a processor, wherein the memory stores computer-readable instructions, and the processor is used to implement the steps of the method described above when executing the computer-readable instructions.

[0032] In a fourth aspect, an embodiment of the present application provides a computer program product, wherein the computer program product includes a computer program, and the computer program is used to implement the method described above when executed by a computer.

[0033] The above introduces a modeling method, system, computer equipment and program product for knitted fabrics, and the modeling method includes: calculating the radius used for the model according to the measured radius, horizontal density, vertical density and thickness of the strands of the knitted fabric, and calculating the coordinates of each type value point of the knitted fabric coil according to the radius used for the model; calculating the coordinates of the center line control point and the midline equation of the knitted fabric coil according to the coordinates of each type value point; calculating the distance between the midline equation and the control point, and mapping each control point and cross-sectional information of the strands to the center line of the knitted fabric; outputting the knitted fabric model, and using Boolean operations to establish a fabric-air system model. That is, the present application conducts a large number of observations and measurements on a variety of knitted fabrics to establish a universal relationship between knitted fabric structural parameters and radius, and inversely calculates the radius through known structural parameters to improve the accuracy of the model, and is convenient and fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a flow chart of a knitted fabric modeling method provided in an embodiment of the present application;

[0035] Figure 2 It is a schematic diagram of the structure of a knitted fabric coil;

[0036] Figure 3 is a flow chart of another knitted fabric modeling method provided in an embodiment of the present application;

[0037] Figure 4 is a flow chart of another knitted fabric modeling method provided in an embodiment of the present application;

[0038] Figure 5 It is a schematic diagram of knitted fabric design;

[0039] Figure 6 It is a schematic diagram of the comparison between simulation and experimental results of thermal resistance of multiple types of knitted fabrics;

[0040] Figure 7 is a structural block diagram of a knitted fabric modeling system provided in an embodiment of the present application;

[0041] Figure 8 It is a basic structural block diagram of a computer device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0043] Please participate Figure 1 , Figure 1 is a flow chart of a knitted fabric modeling method provided in an embodiment of the present application, such as Figure 1 As shown, the modeling method includes the following steps:

[0044] Step S1: Calculate the radius used by the model according to the measured radius, transverse density, longitudinal density and thickness of the strands of the knitted fabric, and calculate the coordinates of each type value point of the knitted fabric loop according to the radius used by the model.

[0045] Step S2: Calculate the coordinates of the center line control points and the center line equation of the knitted fabric loop according to the coordinates of each type value point.

[0046] Step S3: Calculate the distance between the centerline equation and the control point, and map each control point and cross-sectional information of the strand to the centerline of the knitted fabric.

[0047] Step S4: Output the knitted fabric model and use Boolean operations to establish a fabric-air system model.

[0048] Therefore, this embodiment conducts a large number of observations and measurements on various knitted fabrics, such as plain knitted fabrics, to establish a universal relationship model between knitted fabric structural parameters and radius, and the knitted fabric model can be quickly generated by only inputting the fabric structural parameters.

[0049] See also Figure 2 , Figure 2 It is a schematic diagram of the structure of knitted fabric coils, such as Figure 2 The following figure shows the relationship between the knitted fabric coil structure and the knitted fabric strand radius obtained through observation and measurement. In the figure, C and W are the loop width and loop height, respectively. Usually, the fabric structure parameters include transverse density and longitudinal density. The loop width, loop height and transverse density PC , vertical density P W Relational formula:

[0050] C=50 / P c , W=50 / P w

[0051] As shown in Figure 2, the thickness of the knitted fabric is H = 5r1, where r1 is the radius of the knitted fabric strands. Usually, the knitted fabric structural parameters include the above parameters, but Figure 2 If the actual measured r1 is used, the situation of H≠r1, C≠8r1, w≠7r1 may occur, and the error may even be large. In order to compensate for the error, this embodiment implements the scheme of step S1: "calculating the radius used by the model according to the actual measured radius, horizontal density, vertical density and thickness of the ply of the knitted fabric", which specifically includes the following steps: Figure 3 Steps shown:

[0052] Step S21: Calculate a first radius using the measured radius and the horizontal density.

[0053] Step S22: Calculate the second radius through the longitudinal density.

[0054] Step S23: Calculate a third radius using the thickness.

[0055] Step S24: averaging the sum of the measured radius, the first radius, the second radius and the third radius to obtain the radius used by the model. In this way, the measured radius r1 of the knitted fabric strand can be corrected, thereby improving the accuracy of the model.

[0056] For further information, please refer to Figure 2 , where E1,…,E3 are special vertices, A2,…,A4 are the intersections of the needle arc, sinker arc and the circle column, and are interlacing points. B1 and B2 are the midpoints of A1A2 and A3A4, respectively, and are feature points. The coordinates of the type value points are shown in Table 1, where r is the radius used in the model.

[0057] Table 1 Type Pointing

[0058] Type Instructions Final processing point <![CDATA[E1,E3]]> (±4r，0，0) <![CDATA[A1,A4]]> (±r，3r，1.5r) <![CDATA[B1,B2]]> (±2r，6.5r，3r) <![CDATA[A2,A3]]> (±3r，10r，1.5r) <![CDATA[E2]]> (0，13r，0)

[0059] The aforementioned step S2 can specifically use a NURBS type value point back-calculation control point algorithm to calculate the coordinates of the center line control points of the knitted fabric loop and the center line equation. Figure 4 , including the following steps:

[0060] Step S31: extract n points on average from each yarn at each period 2π, then obtain 2i(k+1 / n) control points, and connect the control points of each yarn at the corresponding t (rad).

[0061] Step S32: using the common intersection of the lines connecting the yarn control points on the projection surface to obtain the centerline equation.

[0062] See also Figure 5 , which shows the model space coordinate transformation process, mainly using the original center line periodic arc length equal to the arbitrary curve arc length, and mapping the original center line arc length information to the arbitrary curve arc length segment. That is, the previous step S3 can specifically determine whether the distance between the center line equation and the control point is greater than the preset distance threshold. If the result of the judgment is yes, then map the control points and cross-section information of the strands to the center line of the knitted fabric. More specifically, it can be determined whether the distance is greater than the cumulative sum of the arc lengths between the control points in any segment of the target curve. If the result of the judgment is yes, then map the control points and cross-section information of the strands to the center line of the knitted fabric.

[0063] Furthermore, after the fabric-air system model is established, the knitted fabric can be further imported into the finite element software to simulate the heat transfer of the knitted fabric when the human body contacts the knitted fabric, and the heat conduction condition is added to the fabric-air system model. This allows the model to perform heat transfer analysis. In heat transfer analysis, the traditional method is to perform weighted averaging of material parameters and then import them into a simplified cylindrical yarn model, which inevitably causes errors. The model of the present application can perform analysis by simulating heat conduction when the human body contacts the knitted fabric, thereby improving the simulation accuracy.

[0064] When simulating the contact between human body and knitted fabric, the yarn of knitted fabric can be set as isotropic material and the model is one-weft steady-state heat transfer when simulating the heat transfer of knitted fabric. The boundaries of the knitted fabric on all four sides are further set to be insulated, and there is no heat flow exchange with the environment. Heat convection and heat radiation only exist on the surface of the knitted fabric, and only heat conduction is considered inside.

[0065] In this embodiment, the knitted fabric is introduced into the finite element software to perform heat transfer analysis, and the model error is judged by comparing the simulation value with the experimental value through the thermal resistance parameter index.

[0066] Table 2 Simulation results

[0067]

[0068] Error verification:

[0069] The experimental data are processed, and the comparison between the experimental value and the simulation value is as follows Figure 6 As shown, the maximum error of thermal resistance is -12.5%, and the thermal resistance error is stable at around ±10%. It can be seen that the simulation values ​​of the four types are in good agreement with the experimental values, and the model is feasible.

[0070] Therefore, this embodiment calculates the radius used for the model according to the measured radius, horizontal density, vertical density and thickness of the strands of the knitted fabric, and calculates the coordinates of each type value point of the knitted fabric coil according to the radius used for the model; calculates the coordinates of the center line control point and the midline equation of the knitted fabric coil according to the coordinates of each type value point; calculates the distance between the midline equation and the control point, and maps each control point and cross-sectional information of the strands to the center line of the knitted fabric; outputs the knitted fabric model, and uses Boolean operations to establish a fabric-air system model. That is, the present application conducts a large number of observations and measurements on a variety of knitted fabrics to establish a universal relationship between knitted fabric structural parameters and radius, and inversely calculates the radius through known structural parameters, thereby improving the accuracy of the model and being convenient and fast.

[0071] The present application also provides a knitted fabric modeling system, which is applied to the knitted fabric modeling method described above. Figure 7 , the system 70 comprises:

[0072] The first calculation module 71 is used to calculate the radius used by the model according to the measured radius, transverse density, longitudinal density and thickness of the strands of the knitted fabric, and calculate the coordinates of each type value point of the knitted fabric loop according to the radius used by the model.

[0073] Specifically, the first radius can be calculated by the measured radius and the horizontal density, the second radius can be calculated by the vertical density, and the third radius can be further calculated by the thickness, and finally the sum of the measured radius, the first radius, the second radius and the third radius can be averaged to obtain the radius used by the model. In this way, the accuracy of the model can be improved.

[0074] For further information, please refer to Figure 2 , where E1,…,E3 are special vertices, A2,…,A4 are the intersections of the needle arc, sinker arc and the circle column, and are interlacing points. B1 and B2 are the midpoints of A1A2 and A3A4, respectively, and are feature points. The coordinates of the type value points are shown in Table 1, where r is the radius used in the model.

[0075] Table 1 Type Pointing

[0076] Type Instructions Final processing point <![CDATA[E1,E3]]> (±4r，0，0) <![CDATA[A1,A4]]> (±r，3r，1.5r) <![CDATA[B1,B2]]> (±2r，6.5r，3r) <![CDATA[A2,A3]]> (±3r，10r，1.5r) <![CDATA[E2]]> (0，13r，0)

[0077] The second calculation module 72 is used to calculate the coordinates of the center line control points of the knitted fabric loop and the midline equation according to the coordinates of each type value point. Specifically, the coordinates of the center line control points of the knitted fabric loop and the midline equation can be calculated using the NURBS type value point inverse control point algorithm. More specifically, n points can be extracted from each yarn at each period 2π on average, and 2i (k + 1 / n) control points are obtained, and the control points of each yarn corresponding to t (rad) are connected. Then, the common intersection of the lines connecting the control points of each yarn on the projection surface is used to obtain the midline equation.

[0078] The third calculation module 73 is used to calculate the distance between the centerline equation and the control point, and map each control point and cross-section information of the strand to the centerline of the knitted fabric. Specifically, it can be determined whether the distance between the centerline equation and the control point is greater than a preset distance threshold. If the result of the determination is yes, each control point and cross-section information of the strand is mapped to the centerline of the knitted fabric. More specifically, it can be determined whether the distance is greater than the cumulative sum of the arc lengths between the control points in any section of the target curve. If the result of the determination is yes, each control point and cross-section information of the strand is mapped to the centerline of the knitted fabric.

[0079] A building module 74 is used to output the knitted fabric model and build a fabric-air system model using Boolean operations.

[0080] Furthermore, after the fabric-air system model is established, the knitted fabric can be further imported into the finite element software to simulate the heat transfer of the knitted fabric when the human body contacts the knitted fabric, and the heat conduction condition is added to the fabric-air system model. This allows the model to perform heat transfer analysis. In heat transfer analysis, the traditional method is to perform weighted averaging of material parameters and then import them into a simplified cylindrical yarn model, which inevitably causes errors. The model of the present application can perform analysis by simulating heat conduction when the human body contacts the knitted fabric, thereby improving the simulation accuracy.

[0081] Furthermore, after the fabric-air system model is established, the radius of the model can be further calibrated. Specifically, the diameter ratio between different yarns can be determined first, and the parameters can be randomly determined to draw the circular section under the diameter ratio, so that each yarn section circle is tangent to each other. Then the circumscribed circle of each yarn section circle as a whole, the diameter of the circumscribed circle and the diameter of the strand can be determined. Then, the actual radius of the circumscribed circle is measured through the actual diameter of the yarn determined later, and then the overall size of the circumscribed circle determined in the previous text is scaled to the diameter size actually determined later according to the actual diameter of the circumscribed circle, and the actual arrangement of each yarn section in the strand is determined. In this way, the practicality of the model simulation can be improved.

[0082] To solve the above technical problems, the present application also provides a computer device. Figure 8 , Figure 8 This is a basic structural block diagram of the computer device in this embodiment.

[0083] The computer device 6 includes a memory 61, a processor 62, and a network interface 63 that are interconnected through a system bus. It should be noted that the figure only shows a computer device 6 with components 61-63, but it should be understood that it is not required to implement all the components shown, and more or fewer components can be implemented instead. Among them, those skilled in the art can understand that the computer device here is a device that can automatically perform numerical calculations and / or information processing according to pre-set or stored instructions, and its hardware includes but is not limited to microprocessors, application specific integrated circuits (Application Specific Integrated Circuit, ASIC), programmable gate arrays (Field-Programmable Gate Array, FPGA), digital processors (Digital Signal Processor, DSP), embedded devices, etc.

[0084] The computer device may be a computing device such as a desktop computer, a notebook, a PDA, a cloud server, etc. The computer device may interact with a user through a keyboard, a mouse, a remote controller, a touch pad, or a voice control device.

[0085] The memory 61 includes at least one type of readable storage medium, and the readable storage medium includes flash memory, hard disk, multimedia card, card-type memory (for example, SD or DX memory, etc.), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), programmable read-only memory (PROM), magnetic memory, disk, optical disk, etc. In some embodiments, the memory 61 can be an internal storage unit of the computer device 6, such as a hard disk or memory of the computer device 6. In other embodiments, the memory 61 can also be an external storage device of the computer device 6, such as a plug-in hard disk equipped on the computer device 6, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (FlashCard), etc. Of course, the memory 61 can also include both the internal storage unit of the computer device 6 and its external storage device. In this embodiment, the memory 61 is generally used to store the operating system and various application software installed on the computer device 6, such as computer-readable instructions of the modeling method of knitted fabrics, etc. In addition, the memory 61 can also be used to temporarily store various types of data that have been output or are to be output.

[0086] The processor 62 may be a central processing unit (CPU), a controller, a microcontroller, a microprocessor, or other data processing chips in some embodiments. The processor 62 is generally used to control the overall operation of the computer device 6. In this embodiment, the processor 62 is used to run the computer-readable instructions or process data stored in the memory 61, such as computer-readable instructions for running the modeling method of the knitted fabric.

[0087] The network interface 63 may include a wireless network interface or a wired network interface. The network interface 63 is generally used to establish a communication connection between the computer device 6 and other electronic devices.

[0088] The present application also provides another embodiment, namely, providing a computer program product, wherein the computer program product stores computer-readable instructions, and the computer-readable instructions can be executed by at least one processor to enable the at least one processor to perform the steps of the knitted fabric modeling method as described above.

[0089] The above introduces a modeling method, system, computer equipment and program product for knitted fabrics, and the modeling method includes: calculating the radius used for the model according to the measured radius, horizontal density, vertical density and thickness of the strands of the knitted fabric, and calculating the coordinates of each type value point of the knitted fabric coil according to the radius used for the model; calculating the coordinates of the center line control point and the midline equation of the knitted fabric coil according to the coordinates of each type value point; calculating the distance between the midline equation and the control point, and mapping each control point and cross-sectional information of the strands to the center line of the knitted fabric; outputting the knitted fabric model, and using Boolean operations to establish a fabric-air system model. That is, the present application conducts a large number of observations and measurements on a variety of knitted fabrics to establish a universal relationship between knitted fabric structural parameters and radius, and inversely calculates the radius through known structural parameters to improve the accuracy of the model, and is convenient and fast.

[0090] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for a terminal device (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0091] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0092] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A modeling method for knitted fabrics, characterized in that: The modeling method comprises: Calculate the radius used by the model according to the measured radius, transverse density, longitudinal density and thickness of the strands of the knitted fabric, and calculate the coordinates of each type value point of the loop of the knitted fabric according to the radius used by the model; Calculate the coordinates of the center line control points and the center line equation of the knitted fabric loop according to the coordinates of each value point; Calculating the distance between the centerline equation and the control point, and mapping each control point and cross-sectional information of the strand to the centerline of the knitted fabric; The knitted fabric model was exported and the fabric-air system model was established using Boolean operations.

2. The modeling method according to claim 1, characterized in that: The step of calculating the radius used for the model according to the measured radius, transverse density, longitudinal density and thickness of the strands of the knitted fabric also includes: Calculate a first radius using the measured radius and the horizontal density; Calculating a second radius through the longitudinal density; calculating a third radius using the thickness; The radius used by the model is obtained by averaging the sum of the measured radius, the first radius, the second radius and the third radius.

3. The modeling method according to claim 1, characterized in that: The step of calculating the coordinates of the center line control points and the center line equation of the knitted fabric loop according to the coordinates of each type value point also includes: The coordinates of the center line control points of the knitted fabric loops and the center line equation are calculated using a NURBS type value point back-calculation control point algorithm.

4. The modeling method according to claim 1, characterized in that: The step of calculating the distance between the centerline equation and the control point, and mapping each control point and cross-sectional information of the strand to the centerline of the knitted fabric, further includes: It is determined whether the distance is greater than a preset distance threshold. If the result of the determination is yes, each control point and cross-sectional information of the strand is mapped onto the center line of the knitted fabric.

5. The modeling method according to claim 4, characterized in that: The step of determining whether the distance is greater than a preset distance threshold further includes: It is determined whether the distance is greater than the cumulative sum of arc lengths between control points in any segment of the target curve.

6. The modeling method according to claim 1, characterized in that: The modeling method also includes: The knitted fabric is introduced into finite element software to simulate the heat transfer of the knitted fabric when the human body contacts the knitted fabric, and the heat conduction condition is added to the fabric-air system model.

7. The modeling method according to claim 1, characterized in that: The step of simulating the heat transfer of the knitted fabric when the human body contacts the knitted fabric comprises: Setting the yarn of the knitted fabric to be an isotropic material; The four sides of the knitted fabric are insulated, and there is no heat flow exchange with the environment. Heat convection and heat radiation only exist on the surface of the knitted fabric.

8. A modeling system for knitted fabrics, characterized in that: The modeling system comprises: A first calculation module is used to calculate the radius used by the model according to the measured radius, transverse density, longitudinal density and thickness of the strands of the knitted fabric, and calculate the coordinates of each type value point of the loop of the knitted fabric according to the radius used by the model; A second calculation module is used to calculate the coordinates of the center line control point and the center line equation of the knitted fabric loop according to the coordinates of each type value point; A third calculation module, used for calculating the distance between the center line equation and the control point, and mapping each control point and cross-section information of the strand to the center line of the knitted fabric; Build a module to output knitted fabric models and use Boolean operations to build a fabric-air system model.

9. A computer device, characterized in that: The computer device comprises a memory and a processor, wherein the memory stores computer-readable instructions, and the processor is configured to implement the steps of the method according to any one of claims 1 to 7 when executing the computer-readable instructions.

10. A computer program product, characterized in that The computer program product comprises a computer program for implementing the method according to any one of claims 1 to 7 when the computer program is executed by a computer.

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