Multi-rope pulley block finite element structure simulation method, medium and program product

Abstract

The invention discloses a multi-rope pulley block finite element structure simulation method, a medium and a program product, and the method comprises the steps: building a simplified movable pulley finite element model and a simplified fixed pulley finite element model based on a preset simplification rule; establishing a steel wire rope finite element model based on the movable pulley finite element model, the fixed pulley finite element model and a preset steel wire rope winding mode; obtaining a finite element model of an application object, and generating a multi-rope pulley block finite element model in combination with the movable pulley finite element model, the fixed pulley finite element model and the steel wire rope finite element model; acquiring a script file for automatically controlling the movable pulley and the application object to move; obtaining a relative motion function among the movable pulley, the fixed pulley and the application object, wherein an independent variable of the relative motion function is a moving distance of the movable pulley; and controlling the movable pulley and the application object in the finite element model of the multi-rope pulley block to automatically adjust the position according to the script file and the relative motion function. According to the method, the stress condition in the dynamic change process can be statically simulated, and the simulation efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the field of engineering machinery equipment, and in particular relates to a finite element structure simulation method, a medium and a program product of a multi-rope pulley block. Background Art

[0002] At present, the competition in the construction machinery market is fierce, and many products use pulley blocks. However, in the process of finite element simulation, the simulation processing of pulley blocks is overwhelming. First, if the traditional analytical method is used to extract the tension of the wire rope, and then iterate to the finite element calculation process, it is far from meeting the calculation requirements of multiple postures and multiple working conditions; second, there is currently no method to achieve the same force on the ropes at both ends of the pulley of the pulley block in the simulation model, and at the same time, the tensile stiffness of the rope will automatically change with the length of the rope; finally, when static stiffness analysis is used to simulate the dynamic change force process, due to the long stroke of the pulley block, after the stroke is discretized, there will be many postures, and when there are more movable pulleys, the rope winding method is more complicated. Because the moving speeds of the components at both ends of the movable pulley rope are different, the movement of different components is not synchronized. When the corresponding parameters and postures are modified, the workload is large and error-prone. At present, there is no method to process the model simply and quickly.

[0003] In the Chinese invention patent application with publication number CN118428156A, a two-force bar buckling analysis method, terminal and medium are disclosed. The method mainly uses the TCL script language to solidify the two end points of the two-force bar and the local coordinate system Z-direction node SET set name and standardized output template file method. The program recognizes the node name, establishes the local coordinate system at the specified node, applies constraints at the specified node, and applies forced displacement to the specified node along the local coordinate system, thereby realizing the automatic generation of two files for two-force bar buckling and eccentric buckling, greatly improving work efficiency. This solution is only suitable for the automatic modeling of two-force bars, and cannot simulate and model more complex multi-rope pulley group structures according to custom requirements, and automatically calculate and update parameters.

[0004] In the Chinese invention patent application with publication number CN111797472A, a CAE simulation automated modeling method for the stiffness of the subframe connection point is disclosed. The method is mainly based on an Excel template file of the subframe connection point coordinates and the local coordinate system direction coordinates, a subframe finite element model, and a set of stiffness calculation nodes. Then, by judging the coordinate matching relationship between the connection point coordinates in the Excel template file and the stiffness calculation nodes in the subframe mesh model, a coordinate system is established for the successfully matched points according to the Excel template requirements, and a finite element calculation file for the stiffness of the subframe connection point is generated. This solution can only establish the local coordinate system of the subframe connection point and determine the connection point position, but the more complex multi-rope pulley structure not only needs to determine the position, but also needs to readjust the position according to custom requirements. Summary of the invention

[0005] In view of the above problems, the present invention proposes a finite element structure simulation method, medium and program product for a multi-rope pulley group, which can statically simulate the stress conditions of a dynamic change process and improve the simulation efficiency.

[0006] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0007] In a first aspect, the present invention provides a finite element structure simulation method for a multi-rope pulley block, comprising:

[0008] Based on the preset simplification rules, a simplified finite element model of the movable pulley and a simplified finite element model of the fixed pulley are established;

[0009] Based on the movable pulley finite element model and the fixed pulley finite element model, and the preset wire rope winding method, a wire rope finite element model is established;

[0010] Acquire a finite element model of an application object, and generate a finite element model of a multi-rope pulley group by combining the movable pulley finite element model, the fixed pulley finite element model and the wire rope finite element model;

[0011] Get the script file used to automatically control the movement of the movable pulley and the application object;

[0012] Obtaining a relative motion function between the movable pulley, the fixed pulley and the application object, wherein the independent variable of the relative motion function is the moving distance of the movable pulley;

[0013] According to the script file and the relative motion function, the movable pulley and the application object in the finite element model of the multi-rope pulley group are controlled to automatically adjust their positions.

[0014] In combination with the first aspect, optionally, the methods for establishing the movable pulley finite element model and the fixed pulley finite element model are the same, both comprising:

[0015] Obtain the three-dimensional digital model of the pulley;

[0016] The fixed pulley and movable pulley are divided into three categories according to the wheel, the shaft around which the wheel rotates, and the outer frame of the fixed wheel and the shaft; the outer frame is provided with two holes for accommodating the two ends of the shaft;

[0017] Delete the three-dimensional digital model of the wheel and the axis rotating around the wheel to obtain the three-dimensional digital model of the outer frame;

[0018] Based on the three-dimensional digital model of the outer frame of the fixed wheel and the shaft, the grid unit of the outer frame is established;

[0019] Use rigid units to grab a center point of each of the inner surface nodes of the two holes on the outer frame, named point A and point B, and then find the midpoint between point A and point B, named point O;

[0020] 1D units are established in the OA and OB segments respectively. The end face size of the 1D unit is consistent with the axis size rotating around the pulley, and the axial rotational freedom of the 1D unit is released at point O.

[0021] Create two points at equal radius on both sides of the pulley radial direction on the plane where point O is located, named M and N respectively, and create two rigid units in the OM and ON segments to connect the wire rope.

[0022] In combination with the first aspect, optionally, the method for establishing the finite element model of the steel wire rope includes:

[0023] Based on the winding method of the wire rope, find the connection points between the wire rope and other components in the multi-rope pulley block according to the force transmission sequence of the wire rope;

[0024] Establish a spring unit between two adjacent connection points;

[0025] The spring stiffness of the spring element is calculated based on the length of the wire rope between two adjacent connection points.

[0026] In combination with the first aspect, optionally, the multi-rope pulley block finite element structure simulation method further includes:

[0027] After each adjustment of the position of the movable pulley and the application object in the finite element model of the multi-rope pulley group, the spring stiffness of the spring unit is recalculated based on the length of the wire rope between two adjacent connection points.

[0028] In combination with the first aspect, optionally, the calculation formula of the spring stiffness is:

[0029]

[0030] in, Number The spring stiffness of the spring unit, is the elastic modulus, is the end surface area of ​​the wire rope, Number The spring unit corresponds to the wire rope length.

[0031] In combination with the first aspect, optionally, the connection point between the steel wire rope and other components in the multi-rope pulley block refers to a critical contact point between the steel wire rope and other components in the multi-rope pulley block.

[0032] In combination with the first aspect, optionally, the script file includes a single movement distance and movement direction of each movable pulley and application object.

[0033] In combination with the first aspect, optionally, the script file also includes a maximum moving distance of each movable pulley and the application object.

[0034] In a second aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the multi-rope pulley group finite element structure simulation method described in any one of the first aspects.

[0035] In a third aspect, the present invention provides a computer program product, comprising a computer program / instruction, which, when executed by a processor, implements the multi-rope pulley group finite element structure simulation method described in any one of the first aspects.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] The present invention provides a finite element structure simulation method, medium and program product for a multi-rope pulley block, which can use static simulation to simulate the stress conditions of a dynamic change process and improve the simulation efficiency.

[0038] Specifically, the present invention first establishes a simplified movable pulley finite element model and a fixed pulley finite element model to achieve maximum savings in computing resources and accelerate convergence, and more importantly, to ensure that the ropes at both ends of the pulley are subjected to consistent forces; then, on the basis of the movable pulley finite element model and the fixed pulley finite element model, a wire rope finite element model simulating the wire rope of the pulley block is established to achieve that the wire rope in the pulley block only bears tension but not pressure; finally, based on the movable pulley finite element model, the fixed pulley finite element model and the wire rope finite element model, the movable pulley and its connecting components are automatically adjusted in position within the travel range of the pulley block through a script file, so as to achieve static simulation of the force conditions of the dynamic change process, and at the same time, the tensile stiffness of the wire rope is automatically adjusted as the rope length changes, thereby greatly improving the simulation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor, among which:

[0040] Figure 1 A schematic flow chart of a finite element structure simulation method for a multi-rope pulley block according to an embodiment of the present invention;

[0041] Figure 2 A top view of a finite element model of a pulley according to an embodiment of the present invention;

[0042] Figure 3 A front view of a finite element model of a pulley according to an embodiment of the present invention;

[0043] Figure 4 It is the simulated value of the force on the wire rope on both sides of the lower pulley in a certain posture. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0046] Example 1

[0047] The embodiment of the present invention provides a finite element structure simulation method for a multi-rope pulley group, such as Figure 1 As shown, the following steps are included:

[0048] (1) Based on the preset simplification rules, a simplified finite element model of the movable pulley and the finite element model of the fixed pulley are established;

[0049] (2) establishing a wire rope finite element model based on the movable pulley finite element model and the fixed pulley finite element model and a preset wire rope winding method;

[0050] (3) obtaining a finite element model of the application object, and combining the movable pulley finite element model, the fixed pulley finite element model and the wire rope finite element model to generate a multi-rope pulley group finite element model;

[0051] (4) Obtaining a script file for automatically controlling the movement of the movable pulley and the application object;

[0052] (5) Obtaining the relative motion function between the movable pulley, the fixed pulley, and the application object, where the independent variable of the relative motion function is the moving distance of the movable pulley;

[0053] (6) According to the script file and the relative motion function, the movable pulley and the application object in the finite element model of the multi-rope pulley group are controlled to automatically adjust their positions.

[0054] In a specific implementation of the embodiment of the present invention, Figure 2 and 3 As shown, the establishment methods of the movable pulley finite element model and the fixed pulley finite element model are the same, both including:

[0055] Obtain the three-dimensional digital model of the pulley;

[0056] The fixed pulley and movable pulley are divided into three categories according to the wheel, the shaft around which the wheel rotates, and the outer frame of the fixed wheel and the shaft; the outer frame is provided with two holes for accommodating the two ends of the shaft;

[0057] Delete the three-dimensional digital model of the wheel and the axis rotating around the wheel to obtain the three-dimensional digital model of the outer frame;

[0058] Based on the three-dimensional digital model of the outer frame of the fixed wheel and the shaft, the grid unit of the outer frame is established;

[0059] Use rigid units to grab a center point of each of the inner surface nodes of the two holes on the outer frame, named point A and point B, and then find the midpoint between point A and point B, named point O;

[0060] 1D units are established in the OA and OB segments respectively. The end face size of the 1D unit is consistent with the axis size rotating around the pulley, and the axial rotational freedom of the 1D unit is released at point O.

[0061] Create two points at equal radius on both sides of the pulley radial direction on the plane where point O is located, named M and N respectively, and create two rigid units in the OM and ON segments to connect the wire rope. Figure 4 This is a finite element model of a pulley generated by the method in the embodiment of the present invention. The force simulation values ​​of the wire ropes on both sides of the pulley in a certain posture. Static Min Value and Static MaxValue respectively represent the forces on the ropes at both ends of the pulley. The two values ​​are equal, indicating that the forces on the ropes at both ends of the pulley are consistent, which fully proves the effectiveness of the finite element model of the pulley in the embodiment of the present invention.

[0062] In a specific implementation of the embodiment of the present invention, the method for establishing the finite element model of the wire rope includes:

[0063] Based on the winding method of the wire rope, find the connection points between the wire rope and other components in the multi-rope pulley block according to the force transmission sequence of the wire rope;

[0064] Establish a spring unit between two adjacent connection points;

[0065] The spring stiffness of the spring element is calculated based on the length of the wire rope between two adjacent connection points.

[0066] In a specific implementation of the embodiment of the present invention, the multi-rope pulley group finite element structure simulation method further includes:

[0067] Each time the position of the movable pulley and the application object in the finite element model of the multi-rope pulley group is adjusted, the spring stiffness of the spring unit is recalculated based on the length of the wire rope between two adjacent connection points as the property of the wire rope to ensure that the stiffness of the wire rope in the finite element model is consistent with the actual stiffness of the wire rope.

[0068] The calculation formula of the spring stiffness is:

[0069]

[0070] in, Number The spring stiffness of the spring unit, is the elastic modulus, is the end surface area of ​​the wire rope, Number The spring unit corresponds to the wire rope length.

[0071] In a specific implementation of the embodiment of the present invention, the connection point between the steel wire rope and other components in the multi-rope pulley block refers to the critical contact point between the steel wire rope and other components in the multi-rope pulley block.

[0072] In a specific implementation of the embodiment of the present invention, the script file includes a single moving distance and moving direction of each movable pulley and application object, and a maximum moving distance of each movable pulley and application object.

[0073] The finite element structure simulation method of the multi-rope pulley group in the embodiment of the present invention is described in detail below in conjunction with a specific implementation manner.

[0074] Taking a drilling rig working device as an example, the pulley block of the drilling rig working device is composed of two fixed pulleys and two movable pulleys.

[0075] The multi-rope pulley block finite element structure simulation method specifically comprises the following steps:

[0076] Step 1: Create simplified finite element models of the movable pulley and the fixed pulley.

[0077] The first step is to delete the three-dimensional digital models of the wheels of the four pulleys and the shafts rotating around the wheels to obtain the three-dimensional digital model of the outer frame; based on the three-dimensional digital model of the outer frame with fixed wheels and shafts, establish the grid units of the outer frame.

[0078] In the second step, use the rbe2 unit to grab a center point on the inner surface of the two holes on the outer frame of the four pulleys, and name them respectively. The corresponding center points are ;

[0079] The third step is 1D units are established in each segment. The end face size of the 1D unit is consistent with the size of the axis rotating around the pulley, and The point position releases the rotational freedom of the 1D element in the axial direction;

[0080] Step 4: Create two points at equal radius on both sides of the pulley radial direction on the plane where the point is located, and name them , and in Create two rigid units for each segment to connect the wire rope.

[0081] Step 2: Create a finite element model of the wire rope.

[0082] The first step is to clarify the wire rope winding method. In step 1 The two points are along the moving direction of the movable pulley, defining the number of the connection point between the wire rope and the connecting component, named ;

[0083] The second step is to create 8 spring units based on the wire rope winding method and number the connection points between the wire rope and the connection parts. The corresponding spring unit node ID numbers are 1, 2, 3, 4, 5, 6, 7, and 8, and the wire rope lengths are , , , ;

[0084] The third step is based on the formula Calculate the spring stiffness. The stiffness in the initial posture is: , , , ;

[0085] Step 3, based on the finite element model of the movable pulley, the finite element model of the fixed pulley and the finite element model of the wire rope, automatically realize the position adjustment of the movable pulley and its connecting parts and the adjustment of the tensile stiffness of the wire rope along with the rope length.

[0086] The first step is to create a script file named translate.csv for automatically controlling the movement of the movable pulley and the application object (i.e. the application object of the multi-rope pulley group, such as the drill pipe, etc.);

[0087] The second step is to obtain a finite element model of the application object, and generate a finite element model of a multi-rope pulley group by combining the movable pulley finite element model, the fixed pulley finite element model and the wire rope finite element model;

[0088] In the third step, the following steps are performed for the finite element model of the multi-rope pulley group: a set group is established for the unit containing the fixed pulley, named dinghualun, a set group is established for the unit containing the movable pulley, named donghualun, and another set group is established for the unit containing the drill rod connected to the movable pulley (i.e., the application object), named zuangan;

[0089] The fourth step is to number the spring units used to represent the wire rope in the finite element model in order to calculate the spring stiffness of the spring unit;

[0090] Step 5: Based on the TCL (Tool Command Language) language, write the relative motion function of the three set groups in the third step. The independent variable of the relative motion function is the moving distance of the movable pulley.

[0091] Step 6: Based on the TCL (Tool Command Language) language, write a function to calculate the tensile stiffness of the wire rope. The independent variable is set as the length of the wire rope. After each posture adjustment, the length of the wire rope is updated, and then the tensile stiffness is recalculated.

[0092] Step 7. Based on the two functions in step 5 and step 6, combined with the translate.csv file in step 1, the positions of the components in the finite element model of the multi-rope pulley group are automatically adjusted, and all .fem files within the travel range of the movable pulley are automatically output.

[0093] Example 2

[0094] The present invention provides a computer-readable storage medium having a computer program stored thereon, and when the program is executed by a processor, the finite element structure simulation method of a multi-rope pulley group described in any one of Embodiment 1 is implemented.

[0095] Example 3

[0096] A computer program product is provided in an embodiment of the present invention, including a computer program / instruction, which, when executed by a processor, implements the finite element structure simulation method of a multi-rope pulley group described in any one of Embodiment 1.

[0097] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0098] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0099] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0100] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0101] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which all fall within the protection of the present invention.

[0102] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A finite element structure simulation method for a multi-rope pulley block, characterized in that: include: Based on the preset simplification rules, a simplified finite element model of the movable pulley and a simplified finite element model of the fixed pulley are established; Based on the movable pulley finite element model and the fixed pulley finite element model, and the preset wire rope winding method, a wire rope finite element model is established; Acquire a finite element model of an application object, and generate a finite element model of a multi-rope pulley group by combining the movable pulley finite element model, the fixed pulley finite element model and the wire rope finite element model; Get the script file used to automatically control the movement of the movable pulley and the application object; Obtaining a relative motion function between the movable pulley, the fixed pulley and the application object, wherein the independent variable of the relative motion function is the moving distance of the movable pulley; According to the script file and the relative motion function, the movable pulley and the application object in the finite element model of the multi-rope pulley group are controlled to automatically adjust their positions.

2. The finite element structure simulation method of a multi-rope pulley block according to claim 1, characterized in that: The methods for establishing the movable pulley finite element model and the fixed pulley finite element model are the same, both comprising: Obtain the three-dimensional digital model of the pulley; The fixed pulley and movable pulley are divided into three categories according to the wheel, the shaft around which the wheel rotates, and the outer frame of the fixed wheel and the shaft; the outer frame is provided with two holes for accommodating the two ends of the shaft; Delete the three-dimensional digital model of the wheel and the axis rotating around the wheel to obtain the three-dimensional digital model of the outer frame; Based on the three-dimensional digital model of the outer frame of the fixed wheel and the shaft, the grid unit of the outer frame is established; Use rigid units to grab a center point of each of the inner surface nodes of the two holes on the outer frame, named point A and point B, and then find the midpoint between point A and point B, named point O; 1D units are established in the OA and OB segments respectively. The end face size of the 1D unit is consistent with the axis size rotating around the pulley, and the axial rotational freedom of the 1D unit is released at point O. Create two points at equal radius on both sides of the pulley radial direction on the plane where point O is located, named M and N respectively, and create two rigid units in the OM and ON segments to connect the wire rope.

3. The finite element structure simulation method of a multi-rope pulley block according to claim 1, characterized in that: The method for establishing the finite element model of the steel wire rope comprises: Based on the winding method of the wire rope, find the connection points between the wire rope and other components in the multi-rope pulley block according to the force transmission sequence of the wire rope; Establish a spring unit between two adjacent connection points; The spring stiffness of the spring element is calculated based on the length of the wire rope between two adjacent connection points.

4. The finite element structure simulation method of a multi-rope pulley block according to claim 3, characterized in that: The multi-rope pulley block finite element structure simulation method also includes: After each adjustment of the position of the movable pulley and the application object in the finite element model of the multi-rope pulley group, the spring stiffness of the spring unit is recalculated based on the length of the wire rope between two adjacent connection points.

5. A finite element structure simulation method for a multi-rope pulley block according to claim 3 or 4, characterized in that: The calculation formula of the spring stiffness is: ； in, Number The spring stiffness of the spring unit, is the elastic modulus, is the end surface area of ​​the wire rope, Number The spring unit corresponds to the wire rope length.

6. The finite element structure simulation method of a multi-rope pulley block according to claim 3, characterized in that: The connection point between the steel wire rope and other components in the multi-rope pulley block refers to the critical contact point between the steel wire rope and other components in the multi-rope pulley block.

7. The finite element structure simulation method of a multi-rope pulley block according to claim 1, characterized in that: The script file includes a single moving distance and moving direction of each movable pulley and application object.

8. The finite element structure simulation method of a multi-rope pulley block according to claim 7, characterized in that: The script file also includes the maximum moving distance of each movable pulley and the application object.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the finite element structure simulation method of a multi-rope pulley group according to any one of claims 1 to 8 is implemented.

10. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instruction is executed by a processor, the finite element structural simulation method of a multi-rope pulley group according to any one of claims 1 to 8 is implemented.

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