SACS model-to-ANSYS model conversion method suitable for ocean platform

Abstract

The invention discloses a conversion method from an SACS model to an ANSYS model suitable for an ocean platform. The conversion method from the SACS model to the ANSYS model suitable for the ocean platform comprises the following steps: S1, reading geometric dimension information in an SACS general structure model; s2, reading boundary condition information in the SACS model; s3, reading structural member density and load information in the SACS model; s4, generating a corresponding ANSYS finite element model according to the information read in the step S1; s5, sequentially dividing grids of rod pieces and decks in the ANSYS finite element analysis model; s6, loads in the SACS model are correspondingly converted into mass points of the ANSYS finite element model, and loading is carried out; and S7, setting boundary conditions of the ANSYS finite element model according to the boundary information extracted in the step S2. According to the conversion method from the SACS model to the ANSYS model suitable for the ocean platform, provided by the invention, the rod piece and load information is quickly and accurately converted into ANSYS finite element analysis software from SACS general structure analysis software, and the efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of conversion of computing and analyzing models, and in particular relates to a conversion method from a SACS model to an ANSYS model applicable to an offshore platform. Background Art

[0002] Offshore platforms are located in the marine environment and are affected by wind, waves, and currents. Accurately assessing the stress and strength of offshore platform structures under environmental loads plays a vital role in the safety of offshore structures.

[0003] In actual engineering, general structural analysis software is usually used to perform calculations and analyses on offshore platforms under various working conditions. However, due to the relatively limited functions of general analysis software, some complex calculations and analyses such as modal analysis, vibration type analysis, explosion analysis, collapse analysis, etc., require the use of ANSYS finite element analysis software for calculation verification. Using the existing software conversion module for conversion, there are problems such as the inability to effectively convert rod properties, unit type conversion errors, loads cannot be converted to mass, and connection conversion errors between deck beams and deck plates; if the ANSYS finite element analysis model is re-established, it will take a lot of time and manpower.

[0004] Therefore, it is urgent to design a conversion method from SACS model to ANSYS model suitable for offshore platforms to solve the problems mentioned above that the existing technology cannot complete the conversion, has low conversion accuracy and low conversion efficiency. Summary of the invention

[0005] In order to solve the technical problems mentioned in the background technology that the existing technology cannot complete the conversion, has low conversion accuracy and low conversion efficiency, a conversion method from SACS model to ANSYS model suitable for offshore platforms is provided to solve the above problems.

[0006] To achieve the above purpose, the specific technical solution of the conversion method from SACS model to ANSYS model applicable to the offshore platform of the present invention is as follows: A method for converting a SACS model to an ANSYS model applicable to an offshore platform, characterized in that the conversion method comprises the following steps: S1. Read the geometric dimension information in the SACS general structure model; S2, read the boundary condition information in the SACS model; S3, read the density and load information of the structural components in the SACS model; S4, according to the geometric dimension information extracted in S1, generate the corresponding ANSYS finite element model in the order of material, unit type, section, point, line and surface; S5, dividing the grids of the bars and deck in the ANSYS finite element analysis model in turn; S6, converting the load correspondence in the SACS model into mass points of the ANSYS finite element model and loading them; S7. According to the boundary information extracted in S2, the boundary conditions of the ANSYS finite element model are set to form an ANSYS finite element analysis model with analysis conditions.

[0007] Furthermore, the reading of geometric dimension information in the SACS general structural model mentioned in step S1 refers to obtaining the node number, position, rod endpoint information, rod segmentation information, rod section information, rod material, density information, plate node information, plate thickness, material and density information contained therein through the data file of the SACS general structural model in accordance with the data format specified by the corresponding software, and storing the information in the database.

[0008] Furthermore, the reading of boundary condition information in the SACS model mentioned in step S2 refers to obtaining boundary constraint conditions of the SACS general structure model according to a specified data format and storing the information in a database.

[0009] Furthermore, the reading of the density and load information of the structural members in the SACS model mentioned in step S3 refers to obtaining the mass of the structural members and the size and position information of other equipment and environmental loads according to a specified data format and storing them in a database.

[0010] Furthermore, the step S4 mentioned in which the corresponding ANSYS finite element model is generated in the order of material, unit type, section, point, line and surface according to the geometric dimension information extracted in S1 means that the geometric information stored in the database is converted into a data format recognizable by the ANSYS finite element analysis software in sequence, and after the conversion is completed, it is imported into the ANSYS finite element analysis software to generate the ANSYS finite element analysis model.

[0011] Furthermore, the step S5 mentioned in which the grids of the bars and the deck in the ANSYS finite element analysis model are divided in sequence refers to meshing the ANSYS finite element model according to the type of analysis and accuracy requirements, and the connection between the structural beam and the deck is achieved by analyzing the positional relationship between the structural beam and the deck.

[0012] Furthermore, the ANSYS finite element model was meshed using a mesh size of 1m × 1m.

[0013] Furthermore, the step S6 mentioned in which the loads in the SACS model are converted into mass points of the ANSYS finite element model and loaded means that the load information stored in the database is converted into a format recognizable by the ANSYS finite element analysis software, and after the conversion is completed, it is imported into the ANSYS finite element analysis software to generate the mass information of the ANSYS finite element analysis model.

[0014] Furthermore, the step S7 mentioned in which the boundary conditions of the ANSYS finite element model are set according to the boundary information extracted in S2 to form an ANSYS finite element analysis model with analysis conditions refers to converting the read information into the boundary conditions of the ANSYS finite element model and applying them to the corresponding node positions to complete the conversion of the entire model from the SACS general structural model to the ANSYS finite element analysis model.

[0015] Furthermore, after the model conversion is completed, the stiffness, mass, and vibration mode of the SACS model and the ANSYS model are compared to verify the consistency of the conversion of nodes, structural members, loads, and boundary conditions to ensure that the SACS model and the ANSYS model match.

[0016] The conversion method from SACS model to ANSYS model applicable to an offshore platform of the present invention has the following advantages: By establishing the correspondence between the SACS general structural model of the offshore platform and the ANSYS finite element analysis model, it is possible to quickly and accurately convert information such as rods and loads from the general structural analysis software to the ANSYS finite element analysis software, and generate the corresponding ANSYS finite element analysis model file with high conversion accuracy, thereby avoiding the deficiencies of the existing general structural analysis software in model conversion. Compared with re-establishing the ANSYS finite element model, it can save a lot of modeling and loading time, and significantly improve design efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a flow chart of the conversion method from SACS model to ANSYS model applicable to an offshore platform of the present invention; Figure 2 It is a structural schematic diagram of the SACS general structural model of the present invention; Figure 3 It is a structural schematic diagram of the ANSYS finite element analysis model of the present invention.

[0018] Description of the markings in the figure: 1. SACS general structural model; 11. SACS general structural model nodes; 12. SACS general structural model rods; 13. SACS general structural model boundary conditions; 2. ANSYS finite element analysis model; 21. ANSYS finite element analysis model nodes; 22. ANSYS finite element analysis model rods; 23. ANSYS finite element analysis model boundary conditions. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 those skilled in the art without creative work are within the scope of protection of the present invention.

[0020] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0021] Please refer to the attached Figure 1 To Attachment Figure 3 The conversion method from SACS model to ANSYS model applicable to an offshore platform of the present invention is described.

[0022] In actual engineering, general structural analysis software is usually used to perform calculations and analyses on offshore platforms under various working conditions. However, due to the relatively limited functions of general analysis software, some complex calculations and analyses such as modal analysis, vibration type analysis, explosion analysis, collapse analysis, etc. require the use of ANSYS finite element analysis software for calculation verification. If the ANSYS finite element analysis model 2 is re-established, it will take a lot of time and manpower. Therefore, it is urgent to design a conversion method from SACS model to ANSYS model suitable for offshore platforms to solve the above-mentioned problems.

[0023] like Figure 1 As shown, the conversion method from the SACS model to the ANSYS model applicable to the offshore platform of the present invention is characterized in that the conversion method comprises the following steps: S1, read the geometric dimension information in the SACS general structure model 1; The step S1 of reading the geometric dimension information in the SACS general structural model 1 refers to obtaining the node number, position, bar end point information, bar segmentation information, bar section information, bar material, density information, plate node information, plate thickness, material and density information contained in the data file of the SACS general structural model 1 according to the data format specified by the corresponding software, and storing the information in the database.

[0024] S2, read the boundary condition information in the SACS model; Reading the boundary condition information in the SACS model mentioned in step S2 refers to obtaining the boundary constraint conditions of the SACS general structural model 1 according to a specified data format, including but not limited to hinge, consolidation, spring constraints, etc., and storing the information in a database.

[0025] S3, read the density and load information of the structural components in the SACS model; Reading the density and load information of the structural members in the SACS model mentioned in step S3 refers to obtaining the mass of the structural members and the size and position of other equipment and environmental loads and storing them in the database according to the specified data format.

[0026] S4, according to the geometric dimension information extracted in S1, generate the corresponding ANSYS finite element model in the order of material, unit type, section, point, line and surface; The step S4 mentioned that according to the geometric dimension information extracted in S1, the corresponding ANSYS finite element model is generated in the order of material, unit type, section, point, line and surface, which means that the geometric information stored in the database is converted into a data format recognizable by the ANSYS finite element analysis software in sequence, and after the conversion is completed, it is imported into the ANSYS finite element analysis software to generate the ANSYS finite element analysis model 2.

[0027] S5, dividing the grids of the bars and the deck in the ANSYS finite element analysis model 2 in sequence; The step S5 mentioned in sequentially dividing the grids of the bars and the deck in the ANSYS finite element analysis model 2 refers to meshing the ANSYS finite element model according to the type of analysis and accuracy requirements, and realizing the connection between the structural beam and the deck by analyzing the positional relationship between the structural beam and the deck. In this example, the ANSYS finite element analysis model 2 uses a 1m×1m grid size for meshing, which can generally meet the accuracy requirements of the ANSYS finite element analysis of the offshore platform.

[0028] By analyzing the positional relationship between the structural beam and the deck, the connection between the structural beam and the deck is realized in the ANSYS finite element analysis model 2. Compared with the connection between the structural beam and the deck plate only at the beam end in the SACS model, the real contribution of the deck plate to the platform can be better reflected.

[0029] S6, converting the load correspondence in the SACS model into mass points of the ANSYS finite element model and loading them; The step S6 mentioned in which the load is converted into the mass points of the ANSYS finite element model and loaded means that the load information stored in the database is converted into a format that can be recognized by the ANSYS finite element analysis software, and after the conversion is completed, it is imported into the ANSYS finite element analysis software to generate the mass information of the ANSYS finite element analysis model 2.

[0030] S7. According to the boundary information extracted in S2, the boundary conditions of the ANSYS finite element model are set to form an ANSYS finite element analysis model 2 with analysis conditions.

[0031] The step S7 mentioned that according to the boundary information extracted in S2, the boundary conditions of the ANSYS finite element model 2 are set to form the ANSYS finite element analysis model 2 with analysis conditions, which means that according to the read information, it is converted into the boundary conditions of the ANSYS finite element model and applied to the corresponding node positions to complete the conversion of the entire model from the SACS general structural model 1 to the ANSYS finite element analysis model 2.

[0032] Further, if Figure 2 and Figure 3 As shown, the SACS general structural model node 11 of the SACS general structural model 1 is applied to the ANSYS finite element analysis model node 21 of the ANSYS finite element analysis model 2, the SACS general structural model member 12 is applied to the ANSYS finite element analysis model member 22, and the SACS general structural model boundary condition 13 is applied to the ANSYS finite element analysis model boundary condition 23.

[0033] Furthermore, after the model conversion is completed, the stiffness, mass, and vibration mode of the SACS model and the ANSYS model are compared to verify the consistency of the conversion of nodes, structural members, loads, and boundary conditions to ensure that the SACS model and the ANSYS model match.

[0034] By establishing a corresponding relationship between the SACS general structural model 1 of the offshore platform and the ANSYS finite element analysis model 2, the present invention can realize a rapid and accurate conversion of information such as rods and loads from the general structural analysis software to the ANSYS finite element analysis software, and generate a corresponding ANSYS finite element analysis model 2 file with high conversion accuracy, thereby avoiding the deficiencies of the existing general structural analysis software in model conversion. Compared with re-establishing the ANSYS finite element model, a large amount of modeling and loading time can be saved, and the design efficiency can be significantly improved.

[0035] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A method for converting a SACS model to an ANSYS model suitable for an offshore platform, characterized in that: The conversion method comprises the following steps: S1. Read the geometric dimension information in the SACS general structure model; S2, read the boundary condition information in the SACS model; S3, read the density and load information of the structural components in the SACS model; S4, according to the geometric dimension information extracted in S1, generate the corresponding ANSYS finite element model in the order of material, unit type, section, point, line and surface; S5, dividing the grids of the bars and deck in the ANSYS finite element analysis model in turn; S6, converting the load correspondence in the SACS model into mass points of the ANSYS finite element model and performing loading; S7. According to the boundary information extracted in S2, the boundary conditions of the ANSYS finite element model are set to form an ANSYS finite element analysis model with analysis conditions.

2. The method for converting a SACS model to an ANSYS model suitable for an offshore platform according to claim 1, characterized in that: The reading of geometric dimension information in the SACS general structural model mentioned in step S1 refers to obtaining the node number, position, rod end point information, rod segmentation information, rod section information, rod material, density information, plate node information, plate thickness, material and density information contained therein through the data file of the SACS general structural model in accordance with the data format specified by the corresponding software, and storing the information in the database.

3. The method for converting a SACS model to an ANSYS model applicable to an offshore platform according to claim 1, characterized in that: The reading of the boundary condition information in the SACS model mentioned in step S2 refers to obtaining the boundary constraint conditions of the SACS general structure model according to a specified data format and storing the information in a database.

4. The method for converting from a SACS model to an ANSYS model applicable to an offshore platform according to claim 1, characterized in that: Reading the density and load information of the structural members in the SACS model mentioned in step S3 refers to obtaining the mass of the structural members and the size and position information of other equipment and environmental loads according to the specified data format and storing them in the database.

5. The method for converting from a SACS model to an ANSYS model applicable to an offshore platform according to claim 1, characterized in that: The step S4 mentioned that according to the geometric dimension information extracted in S1, the corresponding ANSYS finite element model is generated in the order of material, unit type, section, point, line and surface, which means that the geometric information stored in the database is converted into a data format recognizable by the ANSYS finite element analysis software in sequence, and after the conversion is completed, it is imported into the ANSYS finite element analysis software to generate the ANSYS finite element analysis model.

6. The method for converting from a SACS model to an ANSYS model applicable to an offshore platform according to claim 1, characterized in that: The step S5 mentioned in which the grids of the bars and the deck in the ANSYS finite element analysis model are divided in sequence refers to meshing the ANSYS finite element model according to the type of analysis and accuracy requirements, and the connection between the structural beam and the deck is achieved by analyzing the positional relationship between the structural beam and the deck.

7. The method for converting a SACS model to an ANSYS model applicable to an offshore platform according to claim 6, characterized in that: The ANSYS finite element model is meshed using a mesh size of 1m×1m.

8. The method for converting from a SACS model to an ANSYS model applicable to an offshore platform according to claim 1, characterized in that: The step S6 mentioned in which the loads in the SACS model are converted into mass points of the ANSYS finite element model and loaded means that the load information stored in the database is converted into a format recognizable by the ANSYS finite element analysis software, and after the conversion is completed, it is imported into the ANSYS finite element analysis software to generate the mass information of the ANSYS finite element analysis model.

9. The method for converting from a SACS model to an ANSYS model applicable to an offshore platform according to claim 1, characterized in that: The step S7 mentioned in the above-mentioned step of setting the boundary conditions of the ANSYS finite element model according to the boundary information extracted in S2 to form an ANSYS finite element analysis model with analysis conditions refers to converting the read information into the boundary conditions of the ANSYS finite element model and applying them to the corresponding node positions to complete the conversion of the entire model from the SACS general structural model to the ANSYS finite element analysis model.

10. The method for converting from a SACS model to an ANSYS model applicable to an offshore platform according to claim 9, characterized in that: After the model conversion is completed, the stiffness, mass, and vibration mode of the SACS model and the ANSYS model are compared to verify the consistency of the conversion of nodes, structural members, loads, and boundary conditions to ensure that the SACS model and the ANSYS model match.

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