Design method and system for topological optimization structure of 3D printing ship parts

Abstract

The invention provides a design method and system for a topological optimization structure of 3D printing ship parts. The method comprises the steps that design parameters and design requirements of a ship propeller are determined according to design data of a ship; based on the design parameters and the design requirements, modeling is conducted through three-dimensional modeling software, and an initial three-dimensional model of the ship propeller is obtained; based on the initial three-dimensional model, performing simulation analysis on the ship propeller through computer-aided engineering software, and optimizing the initial three-dimensional model according to a simulation analysis result to obtain a required three-dimensional model; and based on the required three-dimensional model, a corresponding 3D printing ship propeller is obtained through a 3D printing technology. By means of the machining method, the problems that a numerical control machine tool is difficult to machine and the quality is difficult to guarantee are solved, improvement of an existing ship propeller manufacturing process is facilitated, and the machining efficiency and the machining precision of the ship propeller are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and in particular to a design method and system for a topological optimization structure of a 3D printed ship component. Background Art

[0002] With the continuous advancement of industrial modernization, traditional processing technology can no longer meet the processing requirements of modern industrial components. 3D printing technology came into being. Due to the integrated molding process of 3D printing technology, the parts it produces are much better than those produced by traditional processing technology in terms of strength, cycle, cost, etc. Nowadays, this technology is used in medical, aerospace, automobile, shipbuilding, industrial design and education.

[0003] At present, the shape and surface of existing ship propellers are very complex, and it is difficult to ensure their quality when processed using CNC machine tools. In order to improve the performance and preparation process of the ship propeller, the structural design method of ship propeller components in ship applications using 3D printing technology is studied. Summary of the invention

[0004] Based on this, the purpose of the present invention is to provide a design method and system for a 3D printing ship component topology optimization structure machine to solve the deficiencies in the prior art.

[0005] To achieve the above object, the present invention provides a design method for a topological optimization structure of a 3D printed ship component, the method comprising:

[0006] Determine the design parameters and design requirements of the ship's propeller based on the ship's design data;

[0007] Based on the design parameters and the design requirements, an initial three-dimensional model of the ship propeller is obtained by modeling using three-dimensional modeling software;

[0008] Based on the initial three-dimensional model, the ship propeller is simulated and analyzed by computer-aided engineering software, and the initial three-dimensional model is optimized according to the simulation analysis results to obtain the required three-dimensional model;

[0009] Based on the required three-dimensional model, a corresponding 3D printed ship propeller is obtained through 3D printing technology.

[0010] Preferably, the design parameters of the ship propeller include blade section profile data, and before the step of modeling by three-dimensional modeling software, the method further includes:

[0011] The blade section profile values ​​at multiple radii are obtained based on the ship propeller profile table, the blade section profile values ​​are matched with corresponding blade surface coordinates, and the blade section profile data are calculated based on the corresponding blade surface coordinates.

[0012] Preferably, the leaf section profile data includes the global coordinates of the leaf section, and the expression of the global coordinates of the leaf section is as follows:

[0013]

[0014] Among them, X, Y, Z are the coordinates of the blade section on the X-axis, Y-axis and Z-axis respectively, r is the radius, α is the pitch angle, β is the inclination angle, L is the distance from the guide edge to the reference center line, and X1, Y1, Z1 are the contour value points of the blade section respectively.

[0015] Preferably, the step of simulating and analyzing the ship propeller by computer-aided engineering software comprises:

[0016] Importing the initial three-dimensional model into finite element analysis software to obtain a finite element model;

[0017] The finite element model is meshed based on preset meshing data, and a topological optimization analysis is performed on the meshed finite element model based on boundary conditions, wherein the edges between the duct edge and the guide edge of the ship propeller and between the trailing edge and the blade tip in the finite element model are encrypted so that the surface of the blade edge degenerates into a line, and the line of the blade edge degenerates into a connection point, and the finite element model is divided into an unstructured tetrahedron.

[0018] Preferably, the step of performing topology optimization analysis on the meshed finite element model based on boundary conditions comprises:

[0019] The finite element model after meshing under the custom appearance parameters is simulated to obtain the distribution of the corresponding blade open water performance and surface pressure coefficient;

[0020] The optimal geometric parameters of the ship propeller are obtained based on the distribution of the open water performance and the surface pressure coefficient of the blade, and the optimal geometric parameters include an optimal longitudinal inclination angle and an optimal side inclination amount.

[0021] Preferably, the step of obtaining a corresponding 3D printed ship propeller by 3D printing technology based on the initial three-dimensional model comprises:

[0022] Based on the required three-dimensional model, the metal powder material is processed by selective laser sintering to obtain a preliminary entity of the ship propeller;

[0023] Laser sintering is repeatedly performed on the preliminary entity for multiple times to obtain a 3D printed ship propeller of a preset size.

[0024] To achieve the above object, the present invention also provides a design system for a topological optimization structure of a 3D printed ship component, the system comprising:

[0025] A determination module, used to determine the design parameters and design requirements of the ship propeller according to the design data of the ship;

[0026] A modeling module, used for modeling based on the design parameters and the design requirements and by using a three-dimensional modeling software to obtain an initial three-dimensional model of the ship propeller;

[0027] An optimization module, used for performing simulation analysis on the ship propeller based on the initial three-dimensional model and by computer-aided engineering software, and optimizing the initial three-dimensional model according to the simulation analysis result to obtain a required three-dimensional model;

[0028] The 3D printing module is used to obtain the corresponding 3D printed ship propeller based on the required three-dimensional model through 3D printing technology.

[0029] Preferably, the design parameters of the ship propeller include blade section profile data, and before the modeling module, the system further includes:

[0030] A calculation module is used to obtain blade section profile values ​​at multiple radii based on a ship propeller profile table, wherein the blade section profile values ​​are matched with corresponding blade surface coordinates, and blade section profile data are calculated based on the corresponding blade surface coordinates.

[0031] Preferably, the leaf section profile data includes the global coordinates of the leaf section, and the expression of the global coordinates of the leaf section is as follows:

[0032]

[0033] Among them, X, Y, Z are the coordinates of the blade section on the X-axis, Y-axis and Z-axis respectively, r is the radius, α is the pitch angle, β is the inclination angle, L is the distance from the guide edge to the reference center line, and X1, Y1, Z1 are the contour value points of the blade section respectively.

[0034] Preferably, the optimization module includes:

[0035] An import unit, used for importing the initial three-dimensional model into finite element analysis software to obtain a finite element model;

[0036] A topology optimization unit is used to mesh the finite element model based on preset meshing data, and to perform topology optimization analysis on the meshed finite element model based on boundary conditions, wherein the edges between the duct edge and the guide edge of the ship propeller and between the trailing edge and the blade tip in the finite element model are encrypted so that the surface of the blade edge degenerates into a line, and the line of the blade edge degenerates into a connection point, and the finite element model is divided into unstructured tetrahedrons.

[0037] The beneficial effects of the present invention are as follows: an initial three-dimensional model of a ship propeller that meets design parameters and design requirements is obtained through three-dimensional modeling software, and then based on the initial three-dimensional model, the ship propeller is simulated and analyzed through computer-aided engineering software, and the initial three-dimensional model is optimized according to the simulation analysis results to obtain the required three-dimensional model, and then based on the required three-dimensional model, the corresponding 3D printed ship propeller is obtained through 3D printing technology. Different from the prior art, the 3D printing technology is used in the modeling and manufacturing process of paper ship propellers, which not only improves the problem that CNC machine tools are difficult to process and difficult to ensure quality, but is also conducive to realizing the improvement of the existing ship propeller manufacturing process, and is also conducive to improving the processing efficiency of ship propellers and improving the processing accuracy of ship propellers.

[0038] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A flow chart of a design method for a topological optimization structure of a 3D printed ship component provided by a first embodiment of the present invention;

[0040] Figure 2 A schematic diagram of the structure of a 3D printed ship propeller provided in the first embodiment of the present invention;

[0041] Figure 3 The finite element model provided for the first embodiment of the present invention has a schematic diagram of applied load force and fixed constraints;

[0042] Figure 4 A schematic diagram of a finite element model after meshing provided by the first embodiment of the present invention;

[0043] Figure 5 A distribution diagram of the open water performance and surface pressure coefficient of the blade at different pitch angles provided by the first embodiment of the present invention;

[0044] Figure 6 A distribution diagram of the open water performance and surface pressure coefficient of the blade at different inclinometric values ​​provided by the first embodiment of the present invention;

[0045] Figure 7A schematic diagram of a working process of processing a metal powder material by selective laser sintering provided in a first embodiment of the present invention;

[0046] Figure 8 A schematic diagram of a working process of processing spherical metal powder by selective laser melting provided in a first embodiment of the present invention;

[0047] Fig. 9 A structural block diagram of a design system for a topologically optimized structure of a 3D printed ship component provided by a second embodiment of the present invention.

[0048] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0049] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0050] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0051] Unless otherwise defined, the technical terms or scientific terms involved in this application should be understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the" and the like involved in this application do not indicate a quantitative limitation, and may represent the singular or plural. The terms "include", "comprise", "have" and any of their variations involved in this application are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units that are not listed, or may also include other steps or units inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "multiple" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there may be three relationships, for example, "A and / or B" can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects before and after are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0052] See also Figure 1 , which is a flow chart of a design method for a topologically optimized structure of a 3D printed ship component in a first embodiment of the present invention, wherein the design method for a topologically optimized structure of a 3D printed ship component is used to prepare a 3D printed ship propeller, and the structure of the 3D printed ship propeller is as follows Figure 2 As shown, Figure 1 As shown, the method comprises the following steps:

[0053] Step S101, determining design parameters and design requirements of a ship propeller according to design data of the ship;

[0054] The design data of the ship include the ship model, the ship sailing speed and the ship size.

[0055] Step S102, based on the design parameters and the design requirements, modeling is performed using a three-dimensional modeling software to obtain an initial three-dimensional model of the ship propeller;

[0056] The ship propeller is modeled by using SolidWorks 3D modeling software. The process of modeling the ship propeller by using SolidWorks software is as follows:

[0057] (1) Coordinate transformation. Use EXCEL to generate the global coordinate data of the leaf section at the radius of 0.2R-0.95R, as well as the maximum thickness guide line and the guide edge random guide line, a total of 13 curve coordinates, and save them as TXT files.

[0058] (2) Insert curves. Select "Insert" → "Curve" → "Curve from XYZ Points" to import four guide lines and nine leaf section curves into SolidWorks.

[0059] (3) Fill curve. Select "Fill curve" to generate a leaf section curve at a radius of 0.2R-0.95R.

[0060] (4) Lofting the blades. Select "Lofting Boss-Base", use the four boundary lines as guide lines, and loft the propeller blades based on the blade section with a radius of 0.2R-0.95R.

[0061] (5) Optimize the blade tip. There are two methods to locally optimize the blade tip: 4 guide lines are lofted to generate a closed curve. First, use the "thicken" command to generate a solid. Second, use the "surface stretching" method to stretch the blade surface and blade back curves to generate a blade tip solid.

[0062] (6) Draw the hub. Draw a hub sketch, use "Rotate Boss / Base" to generate the propeller entity and fillet the corners.

[0063] (7) Array propeller blades. Select "Array" → "Circular Array" → "Number of entities: 4" to generate a propeller.

[0064] Step S103, based on the initial three-dimensional model, the ship propeller is simulated and analyzed by computer-aided engineering software, and the initial three-dimensional model is optimized according to the simulation analysis result to obtain the required three-dimensional model;

[0065] The ship propeller is simulated and analyzed by computer-aided engineering software, and the specific analysis content includes flow field analysis, stress analysis, etc. of the ship propeller, so as to evaluate the rationality and stability of the design of the ship propeller.

[0066] In addition, according to the simulation analysis results, the optimized design of the ship propeller includes reducing weight, reducing noise, etc.

[0067] Step S104, based on the required three-dimensional model, a corresponding 3D printed ship propeller is obtained through 3D printing technology.

[0068] Among them, the structural design and manufacturing of 3D printed ship propellers need to be considered in combination with the characteristics of 3D printing technology. For example, the printability of 3D printing, material properties, and the influence of printing accuracy, layer thickness, printing time and other factors should be considered in the design. In addition, for the manufacture of large propellers, it may be necessary to print them in multiple parts and assemble them later.

[0069] Through the above steps, an initial three-dimensional model of a ship propeller that meets the design parameters and design requirements is obtained through three-dimensional modeling software, and then based on the initial three-dimensional model, the ship propeller is simulated and analyzed through computer-aided engineering software, and the initial three-dimensional model is optimized according to the simulation analysis results to obtain the required three-dimensional model, and then based on the required three-dimensional model, the corresponding 3D printed ship propeller is obtained through 3D printing technology. Different from the existing technology, the 3D printing technology is used in the modeling and manufacturing process of paper ship propellers, which not only improves the problem that CNC machine tools are difficult to process and difficult to ensure quality, but is also conducive to improving the existing ship propeller manufacturing process. Improvement, at the same time, is also conducive to improving the processing efficiency of ship propellers and improving the processing accuracy of ship propellers.

[0070] In some embodiments, the design parameters of the ship propeller include blade section profile data, and before the step of modeling by three-dimensional modeling software, the method further includes:

[0071] The blade section profile values ​​at multiple radii are obtained based on the ship propeller profile table, the blade section profile values ​​are matched with corresponding blade surface coordinates, and the blade section profile data are calculated based on the corresponding blade surface coordinates.

[0072] Among them, the ship propeller type values ​​are shown in the following table:

[0073]

[0074] According to the propeller type value table, the blade section type value at each radius of r / R (0.2R, 0.3R, 0.4R, 0.5R, 0.6R, 0.7R, 0.8R, 0.9R, 0.95R) can be obtained, and the blade section profile data can be calculated based on the blade surface coordinates.

[0075] In some embodiments, the leaf section profile data includes the global coordinates of the leaf section, and the expression of the global coordinates of the leaf section is as follows:

[0076]

[0077] Among them, X, Y, Z are the coordinates of the blade section on the X-axis, Y-axis and Z-axis respectively, r is the radius, α is the pitch angle, β is the inclination angle, L is the distance from the guide edge to the reference center line, and X1, Y1, Z1 are the contour value points of the blade section respectively.

[0078] In some embodiments, the step of simulating and analyzing the ship propeller by computer-aided engineering software includes:

[0079] Importing the initial three-dimensional model into finite element analysis software to obtain a finite element model;

[0080] In the design process of the ship propeller, it is necessary to perform a stress test on the ship propeller, that is, to simulate the deformation caused by the pressure load it bears under the working condition of the propeller moving in water. Due to the special working state of the ship propeller, it is necessary to use finite element software to simulate the pressure load during operation.

[0081] It should be noted that, considering the material requirements of finite element analysis, 1060 aluminum alloy material was added to the finite element model for subsequent stress analysis tests in recent years. The material parameters and mechanical properties of 1060 aluminum alloy are shown in the following table, and the parameter settings are completed in the software.

[0082]

[0083] The finite element model is meshed based on preset meshing data, and a topological optimization analysis is performed on the meshed finite element model based on boundary conditions, wherein the edges between the duct edge and the guide edge of the ship propeller and between the trailing edge and the blade tip in the finite element model are encrypted so that the surface of the blade edge degenerates into a line, and the line of the blade edge degenerates into a connection point, and the finite element model is divided into an unstructured tetrahedron.

[0084] When setting the boundary conditions for finite element analysis, it is necessary to add fixed constraints to both ends of the propeller, that is, to apply pressure loads to the propeller blades to simulate the load pressure generated by water on the blades when the propeller is running in water. The load force and fixed constraints are as follows: Figure 3 shown.

[0085] It should be noted that if Figure 4 The figure shows the finite element model after meshing. The geometric model is imported into the finite element analysis software. The mesh of the geometric model is divided into unstructured tetrahedrons, which are located between the edge of the duct and the guide edge of the propeller. During the encryption process of the edge and the blade tip, the mesh of the geometric model is divided into unstructured tetrahedrons.

[0086] The finite element model after meshing adopts 8-node solid45 unit, with a total of 311367 units and 75695 nodes. This unit shape is usually a hexahedral unit, but after some nodes are matched, the unit can degenerate into a triangular prism or a tetrahedron. It is understandable that since the edge of the blade is a spatial surface, there is no way to split the hexahedron, so that the surface at the edge degenerates into a line, and the line at the edge degenerates into a contact point, so as to introduce tetrahedral units in actual calculations, which simplifies the volume of the unit and makes it continuously differentiable at the edge of the blade, so that the integral results at the unit nodes do not diverge and the expected stress-strain results can be obtained.

[0087] In some embodiments, the step of performing topology optimization analysis on the meshed finite element model based on boundary conditions includes:

[0088] The finite element model after meshing under the custom appearance parameters is simulated to obtain the distribution of the corresponding blade open water performance and surface pressure coefficient;

[0089] The optimal geometric parameters of the ship propeller are obtained based on the distribution of the open water performance and the surface pressure coefficient of the blade, and the optimal geometric parameters include an optimal longitudinal inclination angle and an optimal side inclination amount.

[0090] Among them, it is known that the longitudinal inclination angle and the skew amount of the blade will affect the water-breaking efficiency of the ship propeller. Therefore, on the basis of the completion of the propeller entity modeling, propeller entity models with different longitudinal inclination angles and skew amounts are drawn respectively, and these models are simulated and studied to analyze the influence of these two parameters on the hydrodynamic performance of the ship propeller, providing a theoretical basis for designing these two parameters of the ship propeller.

[0091] Specifically, the open water performance of the propeller at different pitch angles was simulated, and the distribution of the open water performance and surface pressure coefficient of the blade was obtained, such as Figure 5 As shown. Figure 5 It can be seen that the negative pressure on the blade surface is the smallest when the pitch angle is 10°, while the negative pressure on the propeller surface is slightly larger when the pitch angle is 8° and 12°, so the selection of a pitch angle of 10° can effectively improve the cavitation effect during the operation of the propeller. From the following Table 4-1, it can be seen that the propeller thrust and torque decrease with the increase of the pitch angle, and the propeller achieves the highest open water efficiency when the pitch angle is 10°. From the above analysis, in the design of the propeller, a pitch angle of 10° is the most suitable.

[0092] Table 4-1 Propeller water-removal efficiency at different side inclinations

[0093]

[0094] The open water performance of the propeller under different skew conditions was simulated, and the distribution of the open water performance and surface pressure coefficient of the blade was obtained. Figure 6 It can be seen that the minimum negative pressure on the propeller surface with a side tilt of 0.8 times decreases the most, and the minimum negative pressure on the propeller surface with a side tilt of 1.2 times increases slightly compared to the original side tilt, so reducing the propeller side tilt is beneficial to reducing the probability of cavitation. From the following table 4-2, it can be seen that the propeller thrust, torque and open water efficiency all reach the maximum value under the action of the original side tilt, but the side tilt size has almost no effect on the open water efficiency. Based on the above, the propeller side tilt amount needs to be controlled when designing the propeller. The side tilt amount of 1.0 times is the most suitable.

[0095] Table 4-2 Propeller water-removing efficiency at different side inclinations

[0096]

[0097] The above results show that the trim angle and the side inclination have little effect on the propeller open water efficiency, thrust and torque, but have a relatively large impact on the distribution of surface pressure. When designing a propeller, the designer needs to choose the appropriate trim angle and side inclination of the propeller. It is most appropriate for the propeller to use a 10° trim angle and a 1.0 times side inclination. At this time, its water-repelling performance is optimal, which can reduce the thickness of the blades, that is, the mass of the propeller can be reduced. The specific data is shown in Table 4-3, so that it can meet the lightweight design requirements.

[0098] Table 4-3 Propeller mass changes

[0099]

[0100] In some embodiments, the step of obtaining a corresponding 3D printed ship propeller by 3D printing technology based on the initial three-dimensional model includes:

[0101] Based on the required three-dimensional model, the metal powder material is processed by selective laser sintering to obtain a preliminary entity of the ship propeller;

[0102] Laser sintering is repeatedly performed on the preliminary entity for multiple times to obtain a 3D printed ship propeller of a preset size.

[0103] Among them, the material for selective laser sintering is metal powder. When the metal powder material is processed by selective laser sintering, the metal powder is heated to a temperature close to its melting point, and then flattened with a roller. The laser beam is controlled by a computer, and the solid powder material is selectively sintered along a two-dimensional scanning trajectory according to the prototype slice model, thereby forming a layer on the surface of the part, that is, a preliminary entity. After that, the working piston is reduced by one layer of thickness and new powder is laid by the powder laying system. The laser beam is controlled to re-scan and sinter a new layer on the preliminary entity, and this cycle is repeated, layer by layer, until a 3D printed ship propeller of a preset size is formed. In theory, as long as the powder material can form a bond between atoms, it can be used as a selective laser sintering material. Currently, the selective laser sintering materials that can be successfully formed and processed include: paraffin, polymers (PC, nylon, PE, PP, etc.), metals, ceramic powders, and composite powder materials. The schematic diagram of its working process is shown below Figure 7 shown.

[0104] In other embodiments, the step of obtaining a corresponding 3D printed ship propeller by 3D printing technology based on the initial three-dimensional model includes:

[0105] Based on the required three-dimensional model, spherical metal powder is processed by selective laser melting to obtain a 3D printed ship propeller of preset size.

[0106] Among them, Selective Laser Melting (SLM) is also a 3D printing technology based on powder bed melting. Its molding principle is basically the same as that of selective laser sintering. The difference is that its laser energy is higher, which can completely melt the metal powder and the manufactured objects are close to completely dense. Therefore, selective laser melting is suitable for additive manufacturing of various metal materials. Figure 8 The figure shows the principle of SLM 3D printing technology. SLM uses spherical metal powder with fine particle size (10-50um) as raw material. During the molding process, a high-energy laser beam is used to selectively melt the metal powder according to the designed scanning path based on the three-dimensional digital model, and a three-dimensional solid object is manufactured by layer-by-layer powder laying, layer-by-layer incubation, and layer-by-layer solidification and accumulation. SLM 3D printing technology can directly produce terminal metal products, thereby eliminating the intermediate transition link, and can obtain a metallurgically bonded metal entity with a density close to 100%.

[0107] It should be noted that the steps shown in the above process or the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0108] The second embodiment of the present application also provides a design system for the topological optimization structure of 3D printed ship parts, which is used to implement the above-mentioned first embodiment and preferred implementation mode, and will not be repeated hereafter. As used below, the terms "module", "unit", "subunit", etc. can be a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0109] Fig. 9 The design system of the topological optimization structure of 3D printed ship parts in the second embodiment of the present application is as follows: Fig. 9 The system comprises:

[0110] A determination module 10 is used to determine the design parameters and design requirements of the ship propeller according to the design data of the ship;

[0111] A modeling module 20, configured to obtain an initial three-dimensional model of the ship propeller based on the design parameters and the design requirements and by using three-dimensional modeling software;

[0112] An optimization module 30 is used to simulate and analyze the ship propeller based on the initial three-dimensional model through computer-aided engineering software, and optimize the initial three-dimensional model according to the simulation analysis results to obtain a required three-dimensional model;

[0113] The 3D printing module 40 is used to obtain a corresponding 3D printed ship propeller based on the required three-dimensional model through 3D printing technology.

[0114] In the specific implementation, an initial three-dimensional model of a ship propeller that meets the design parameters and design requirements is obtained through three-dimensional modeling software, and then based on the initial three-dimensional model, the ship propeller is simulated and analyzed through computer-aided engineering software, and the initial three-dimensional model is optimized according to the simulation analysis results to obtain the required three-dimensional model, and then based on the required three-dimensional model, the corresponding 3D printed ship propeller is obtained through 3D printing technology. Different from the existing technology, the 3D printing technology is used in the modeling and manufacturing process of paper ship propellers, which not only improves the problem of difficult processing and difficulty in ensuring quality by CNC machine tools, but also is conducive to the improvement of the existing ship propeller manufacturing process, and is also conducive to improving the processing efficiency and processing accuracy of ship propellers.

[0115] In some embodiments, the design parameters of the ship propeller include blade section profile data, and before the modeling module, the system further includes:

[0116] A calculation module is used to obtain blade section profile values ​​at multiple radii based on a ship propeller profile table, wherein the blade section profile values ​​are matched with corresponding blade surface coordinates, and blade section profile data are calculated based on the corresponding blade surface coordinates.

[0117] In some embodiments, the leaf section profile data includes the global coordinates of the leaf section, and the expression of the global coordinates of the leaf section is as follows:

[0118]

[0119] Among them, X, Y, Z are the coordinates of the blade section on the X-axis, Y-axis and Z-axis respectively, r is the radius, α is the pitch angle, β is the inclination angle, L is the distance from the guide edge to the reference center line, and X1, Y1, Z1 are the contour value points of the blade section respectively.

[0120] In some embodiments, the optimization module 30 includes:

[0121] An import unit, used for importing the initial three-dimensional model into finite element analysis software to obtain a finite element model;

[0122] A topology optimization unit is used to mesh the finite element model based on preset meshing data, and to perform topology optimization analysis on the meshed finite element model based on boundary conditions, wherein the edges between the duct edge and the guide edge of the ship propeller and between the trailing edge and the blade tip in the finite element model are encrypted so that the surface of the blade edge degenerates into a line, and the line of the blade edge degenerates into a connection point, and the finite element model is divided into unstructured tetrahedrons.

[0123] In some embodiments, the topology optimization unit includes:

[0124] A simulation subunit, used for simulating the finite element model after meshing under the custom appearance parameters, to obtain the distribution of the open water performance and surface pressure coefficient of the corresponding blade;

[0125] The acquisition subunit is used to acquire the optimal geometric parameters of the ship propeller based on the distribution of the open water performance of the blade and the surface pressure coefficient, and the optimal geometric parameters include the optimal pitch angle and the optimal side slope.

[0126] In some embodiments, the 3D printing module 40 includes:

[0127] A processing unit, used for processing the metal powder material by selective laser sintering based on the required three-dimensional model to obtain a preliminary entity of the ship propeller;

[0128] A unit is obtained, which is used to repeatedly perform laser sintering on the preliminary entity to obtain a 3D printed ship propeller of a preset size.

[0129] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0130] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. 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 invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A design method for topological optimization structure of 3D printed ship parts, characterized in that: The method comprises: Determine the design parameters and design requirements of the ship's propeller based on the ship's design data; Based on the design parameters and the design requirements, an initial three-dimensional model of the ship propeller is obtained by modeling using three-dimensional modeling software; Based on the initial three-dimensional model, the ship propeller is simulated and analyzed by computer-aided engineering software, and the initial three-dimensional model is optimized according to the simulation analysis results to obtain the required three-dimensional model; Based on the required three-dimensional model, a corresponding 3D printed ship propeller is obtained through 3D printing technology.

2. The design method of the topological optimization structure of 3D printed ship parts according to claim 1 is characterized in that: The design parameters of the ship propeller include blade section profile data. Before the step of modeling by three-dimensional modeling software, the method further includes: The blade section profile values ​​at multiple radii are obtained based on the ship propeller profile table, the blade section profile values ​​are matched with corresponding blade surface coordinates, and the blade section profile data are calculated based on the corresponding blade surface coordinates.

3. The design method of the topological optimization structure of 3D printed ship parts according to claim 2 is characterized in that: The leaf section profile data includes the global coordinates of the leaf section, and the expression of the global coordinates of the leaf section is as follows: Among them, X, Y, Z are the coordinates of the blade section on the X-axis, Y-axis and Z-axis respectively, r is the radius, α is the pitch angle, β is the inclination angle, L is the distance from the guide edge to the reference center line, and X1, Y1, Z1 are the contour value points of the blade section respectively.

4. The design method of the topological optimization structure of 3D printed ship parts according to claim 1 is characterized in that: The step of simulating and analyzing the ship propeller by computer-aided engineering software comprises: Importing the initial three-dimensional model into finite element analysis software to obtain a finite element model; The finite element model is meshed based on preset meshing data, and a topological optimization analysis is performed on the meshed finite element model based on boundary conditions, wherein the edges between the duct edge and the guide edge of the ship propeller and between the trailing edge and the blade tip in the finite element model are encrypted so that the surface of the blade edge degenerates into a line, and the line of the blade edge degenerates into a connection point, and the finite element model is divided into an unstructured tetrahedron.

5. The design method of the topological optimization structure of 3D printed ship parts according to claim 4 is characterized in that: The step of performing topology optimization analysis on the meshed finite element model based on boundary conditions comprises: The finite element model after meshing under the custom appearance parameters is simulated to obtain the distribution of the corresponding blade open water performance and surface pressure coefficient; The optimal geometric parameters of the ship propeller are obtained based on the distribution of the open water performance and the surface pressure coefficient of the blade, and the optimal geometric parameters include an optimal longitudinal inclination angle and an optimal side inclination amount.

6. The design method of the topological optimization structure of 3D printed ship parts according to claim 1 is characterized in that: The step of obtaining a corresponding 3D printed ship propeller by 3D printing technology based on the initial three-dimensional model comprises: Based on the required three-dimensional model, the metal powder material is processed by selective laser sintering to obtain a preliminary entity of the ship propeller; Laser sintering is repeated multiple times on the preliminary entity to obtain a 3D printed ship propeller of a preset size.

7. A design system for topological optimization structure of 3D printed ship parts, characterized in that: The system comprises: A determination module, used to determine the design parameters and design requirements of the ship propeller according to the design data of the ship; A modeling module, used for modeling based on the design parameters and the design requirements and by using a three-dimensional modeling software to obtain an initial three-dimensional model of the ship propeller; An optimization module, used for performing simulation analysis on the ship propeller based on the initial three-dimensional model and by computer-aided engineering software, and optimizing the initial three-dimensional model according to the simulation analysis result to obtain a required three-dimensional model; The 3D printing module is used to obtain the corresponding 3D printed ship propeller based on the required three-dimensional model through 3D printing technology.

8. The design system for topological optimization structure of 3D printed ship parts according to claim 7, characterized in that: The design parameters of the ship propeller include blade section profile data. Before the modeling module, the system also includes: A calculation module is used to obtain blade section profile values ​​at multiple radii based on a ship propeller profile table, wherein the blade section profile values ​​are matched with corresponding blade surface coordinates, and blade section profile data are calculated based on the corresponding blade surface coordinates.

9. The design system for topological optimization structure of 3D printed ship parts according to claim 8, characterized in that: The leaf section profile data includes the global coordinates of the leaf section, and the expression of the global coordinates of the leaf section is as follows: Among them, X, Y, Z are the coordinates of the blade section on the X-axis, Y-axis and Z-axis respectively, r is the radius, α is the pitch angle, β is the inclination angle, L is the distance from the guide edge to the reference center line, and X1, Y1, Z1 are the contour value points of the blade section respectively.

10. The design system for topological optimization structure of 3D printed ship parts according to claim 7, characterized in that: The optimization module includes: An import unit, used for importing the initial three-dimensional model into finite element analysis software to obtain a finite element model; A topology optimization unit is used to mesh the finite element model based on preset meshing data, and to perform topology optimization analysis on the meshed finite element model based on boundary conditions, wherein the edges between the duct edge and the guide edge of the ship propeller and between the trailing edge and the blade tip in the finite element model are encrypted so that the surface of the blade edge degenerates into a line, and the line of the blade edge degenerates into a connection point, and the finite element model is divided into unstructured tetrahedrons.

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