Rigidity optimization method of shaft base

Abstract

The invention belongs to the technical field of ship design, and provides a shaft engine base rigidity optimization method comprising the following steps: S1, establishing a base system model comprising a base model; s2, applying a load to the base model, and calculating the first rigidity of the base model; s3, judging whether the first rigidity reaches preset rigidity or not; s4, when the result is no, performing structure optimization and size optimization on the base model; s5, calculating second rigidity of the optimized base model, and judging whether the second rigidity reaches preset rigidity or not; and the step S4 is repeatedly executed to optimize the size of the base model and the step S5 is repeatedly executed until the second rigidity reaches the preset rigidity. The structural arrangement of the base model is adjusted by optimizing the structure of the base model, the rigidity of the base model can be increased, the size of the base model with the optimized structure is optimized, the requirement for the thickness of a plate in the model is reduced, the rigidity of the model is further improved, the model reaches the preset rigidity, the design requirement of a manufacturer is met, and the manufacturing cost is reduced. The ship structural strength is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of ship design, and in particular to a method for optimizing the stiffness of an alternator pedestal. Background Art

[0002] The ship shaft generator system, abbreviated as the shaft generator system, is a power generation system applied to ships. It utilizes the excess power generated during the operation of the main engine and converts it into electrical energy to meet the power consumption requirements of various electrical equipment on the ship, thereby achieving the purpose of energy conservation. The shaft generator is placed on the alternator pedestal (abbreviated as the shaft generator pedestal). The shaft generator pedestal is arranged above the inner bottom of the double-bottom structure in the engine room. Both ends of the shaft generator in the fore-and-aft direction are connected to the intermediate bearing through elastic couplings. The intermediate bearing on the side of the shaft generator close to the stern is connected to the propeller propulsion system through the stern tube bearing, and the intermediate bearing on the side of the shaft generator close to the bow is connected to the main engine, jointly forming a set of electric propulsion system.

[0003] When the ship electric propulsion system operates, it will generate huge vibrations. Excessive vibrations will affect the installation of the intermediate bearing and the shaft generator. Usually, the manufacturer will put forward stiffness requirements for the shaft generator pedestal to control the deformation of the pedestal during the operation of the shaft generator. The shipyard conducts finite element verification on the strength and stiffness of the shaft generator pedestal according to the equipment data provided by the manufacturer to meet the requirements of the manufacturer. When the calculated stiffness of the shaft generator pedestal cannot meet the requirements of the manufacturer, generally, the stiffness of the shaft generator pedestal is increased by increasing the thickness of the face plate and the bracket plate in the shaft generator pedestal. However, the stiffness of the shaft generator pedestal obtained by increasing the plate thickness often fails to achieve the expected effect. In addition, when the height of the shaft generator pedestal increases, its stability will also become worse, and the plate thickness of the thickened face plate and bracket plate will be too large. For example, it needs to be increased from 35 mm to 80 mm. However, there are problems such as difficult ordering and excessive overall weight for steel plates with special plate thicknesses after thickening. Summary of the Invention

[0004] The purpose of the present application is to provide a method for optimizing the stiffness of an alternator pedestal to solve problems such as the stiffness of the alternator pedestal in the prior art not meeting the design requirements.

[0005] To achieve the above and other related purposes, the present application provides a method for optimizing the stiffness of an alternator pedestal, including the following steps:

[0006] S1. Establish a pedestal system model, where the pedestal system model includes a pedestal model;

[0007] S2. Apply a load to the pedestal model and calculate the first stiffness of the pedestal model;

[0008] S3. Determine whether the first stiffness reaches a preset stiffness;

[0009] S4. When the result is "No", perform structural optimization and dimensional optimization on the base model.

[0010] S5. Calculate the second stiffness of the optimized base model and determine whether the second stiffness reaches the preset stiffness.

[0011] S6. Repeat step S4 for dimensional optimization of the base model and step S5 until the second stiffness reaches the preset stiffness.

[0012] Optionally, the base system model further includes a strengthening structure model and a double bottom model. The double bottom model has a ship bottom plate and an inner bottom plate. The base model is located on the inner bottom plate. The strengthening structure model is located between the ship bottom plate and the inner bottom plate and is connected to the inner bottom plate.

[0013] Optionally, the base model at least includes:

[0014] A web model, including two vertically placed base webs. The two base webs are symmetrically arranged along the y direction. The shaft generator is placed between the two base webs.

[0015] An elbow plate model, including two groups of vertically placed first large elbow plates. The two groups of first large elbow plates are respectively located on the opposite sides of the web model along the y direction. The first large elbow plates are connected to the base webs and are spaced from the ship bottom plate along the y direction. The thickness direction of the first large elbow plates is the x direction.

[0016] A panel model, including an upper panel of the first elbow plate, an upper panel of the first web, and an upper panel of the base. The upper panel of the base is horizontally placed and covers a part of the upper surface of the base webs and a part of the upper surface of the first large elbow plates. A plurality of mounting holes are provided in the upper panel of the base for fixing the shaft generator. Looking down at the base model along the z direction, the upper panel of the first elbow plate is arranged on one side of the upper panel of the base along the y direction and covers a part of the upper surface of the first large elbow plates. The upper panel of the first web is arranged on at least one side of the upper panel of the base along the x direction and covers a part of the upper surface of the base webs.

[0017] Wherein, the x direction is the ship length direction, the y direction is the ship width direction, the z direction is the vertical direction, and the x direction, the y direction, and the z direction are perpendicular to each other in pairs.

[0018] Optionally, in step S2, calculating the first stiffness of the base model includes the following steps:

[0019] Obtain the weight of the shaft generator and the positions of the mounting holes.

[0020] Set boundary conditions for the base system model;

[0021] Apply loads to the base model according to the weight of the shaft generator and the positions of the mounting holes;

[0022] Obtain the deformation of the base model after the loads are applied;

[0023] Calculate the first stiffness of the base model based on the deformation of the base model and the weight of the shaft generator.

[0024] Optionally, the step of setting boundary conditions for the base system model includes: setting rigid fixing conditions at opposite ends of the double bottom model in the x direction to fix the positions of opposite ends of the double bottom model in the x direction.

[0025] Optionally, in step S4, the structural optimization of the base model includes the following steps:

[0026] Obtain the large bracket optimization model and the panel optimization model;

[0027] According to the large bracket optimization model and the panel optimization model, perform structural optimization on the bracket model and the panel model in the base model;

[0028] Obtain the small bracket attachment model and add the small bracket attachment model to opposite ends of the web model in the x direction.

[0029] Optionally, the step of performing structural optimization on the bracket model in the base model includes: replacing the first large bracket in the bracket model with the large bracket optimization model;

[0030] Wherein, the large bracket optimization model includes two groups of second large brackets, the two groups of second large brackets are respectively located on opposite sides of the web model in the y direction, the second large brackets are respectively connected to the web model and the inner bottom plate, and the second large brackets extend in the y direction and are connected to the ship bottom plate; and, the number of each group of second large brackets is greater than the number of each group of first large brackets, manholes are provided in the second large brackets, and a number of strengthening members are also provided on the second large brackets.

[0031] Optionally, the panel optimization model includes an optimized upper bracket panel and an optimized upper web panel; the step of performing structural optimization on the panel model in the base model includes: replacing the first upper bracket panel and the first upper web panel with the optimized upper bracket panel and the optimized upper web panel respectively, and connecting the optimized upper bracket panel and the optimized upper web panel to the base upper panel respectively;

[0032] Among them, the optimized upper panel of the gusset is located above the second largest gusset, the optimized upper panel of the web is located above the base web, the optimized upper panel of the gusset includes a second upper panel of the gusset and an interconnected upper panel of the gusset. The interconnected upper panel of the gusset is located between the second upper panel of the gusset and the upper panel of the base, and is respectively connected to the second upper panel of the gusset and the upper panel of the base. The optimized upper panel of the web includes an interconnected upper panel of the web and a second upper panel of the web. The interconnected upper panel of the web is located between the second upper panel of the web and the upper panel of the base, and is respectively connected to the second upper panel of the web and the upper panel of the base.

[0033] Optionally, in step S4, the steps of optimizing the dimensions of the base model include:

[0034] Adjust the width and thickness of the second upper panel of the gusset; and / or,

[0035] The width and thickness of the second upper panel of the web; and / or,

[0036] The width of the upper panel of the base; and / or,

[0037] The thickness of the second largest gusset.

[0038] Optionally, the width of the upper panel of the base in the y direction does not exceed a preset first threshold.

[0039] As described above, compared with the prior art, the method for optimizing the stiffness of the shaft generator base provided by the present application has at least the following beneficial effects:

[0040] The stiffness optimization method of the present application can calculate the first stiffness of the base model by constructing a base system model and applying a load to the base model therein; when the first stiffness does not reach the preset stiffness, the structure of the base model is optimized to adjust the structural layout of the base model, thereby increasing the stiffness of the base model; when the second stiffness of the optimized base model still does not reach the preset stiffness, the dimensions of the optimized base model are optimized until the second stiffness after optimization can reach the preset stiffness. Therefore, by sequentially performing structural optimization and dimension optimization on the base model, the stiffness of the base model can be effectively improved, so that the stiffness of the optimized base model can meet the requirements of the manufacturer and achieve the purpose of ensuring the structural strength of the ship; and, by performing structural optimization on the base model, the requirement for the thickness of the sheet material during dimension optimization of the base model can be reduced, making the sheet material in the optimized base model easy to customize, purchase and process, and achieving the purpose of cost reduction, efficiency improvement and safe construction. Description of the Drawings

[0041] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings required in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0042] Figure 1 It shows a schematic flow chart of the stiffness optimization method for the shaft generator base provided by the embodiment of the present application.

[0043] Figure 2 It shows a schematic cross-sectional view of a base model provided by the embodiment of the present application in the transverse direction.

[0044] Figure 3 It shows a schematic cross-sectional view of a base model provided by the embodiment of the present application in the longitudinal direction.

[0045] Figure 4 It shows a schematic structural view of a base model provided by the embodiment of the present application when viewed from above in the z direction.

[0046] Figure 5 It shows a schematic structural view of an inner bottom plate provided by the embodiment of the present application when viewed from below in the z direction.

[0047] Figure 6 It shows a schematic structural view of a ship electric propulsion system provided by the embodiment of the present application.

[0048] Figure 7 It shows a schematic flow chart of a method for calculating the first stiffness of a base model provided by the embodiment of the present application.

[0049] Figure 8 It shows a schematic cross-sectional view of an optimized base model provided by the embodiment of the present application in the transverse direction.

[0050] Figure 9 It shows a schematic cross-sectional view of an optimized base model provided by the embodiment of the present application in the longitudinal direction.

[0051] Figure 10 It shows a schematic structural view of an optimized base model provided by the embodiment of the present application when viewed from above in the z direction.

[0052] Figure 11 It shows a schematic structural view of a small bracket additional model provided by the embodiment of the present application.

[0053] Figure 12 It shows a schematic structural view of an optimized upper panel of a bracket provided by the embodiment of the present application.

[0054] Schematic illustration of reference numerals:

[0055] 1. Shaft generator base; 10. Base model; 11. Web model; 111. Base web; 12. Brackets model; 121. First large bracket; 13. Panel model; 131. Upper panel of the base; 1311. Mounting holes; 132. Upper panel of the first bracket; 133. Upper panel of the first web; 14. Optimized model of the large bracket; 141. Second large bracket; 1411. Manhole; 1412. Reinforcement; 151. Upper panel of the optimized bracket; 1511. Upper panel of the second bracket; 1512. Interconnected upper panel of the brackets; 152. Upper panel of the optimized web; 1521. Upper panel of the second web; 1522. Interconnected upper panel of the webs; 16. Additional model of the small bracket; 20. Reinforcement structure model; 30. Double bottom model; 31. Inner bottom plate; 32. Ship bottom plate; 2. Shaft generator; 3. Stern tube bearing; 4. Intermediate bearing; 5. Propeller propulsion system; 6. Main engine. Detailed implementation manners

[0056] To make the technical objectives, technical solutions and technical effects of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of this application, rather than all of them. The components of the embodiments of this application usually described and shown in the drawings here can be arranged and designed in various different configurations.

[0057] Therefore, the following detailed description of the embodiments of this application is not intended to limit the scope of this application that is claimed, but merely represents the selected embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts fall within the scope of protection of this application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0058] In the description of this application, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of this application.

[0059] In the description of the present application, unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection or a detachable connection. Additionally, descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0060] To solve the problem that the stiffness of the shaft generator pedestal 1 in the prior art cannot meet the design requirements, this embodiment provides a method for optimizing the stiffness of the shaft generator pedestal 1 to improve the stiffness of the shaft generator pedestal 1 and achieve the safe construction of the ship.

[0061] Refer to Figure 1 , the method for optimizing the stiffness of the shaft generator pedestal 1 provided in this embodiment includes steps S1 to S6, specifically including:

[0062] S1. Establish a pedestal system model, where the pedestal system model includes a pedestal model 10;

[0063] S2. Apply a load to the pedestal model 10 and calculate the first stiffness of the pedestal model 10;

[0064] S3. Determine whether the first stiffness reaches a preset stiffness;

[0065] S4. When the result is "no", perform structural optimization and dimensional optimization on the pedestal model 10;

[0066] S5. Calculate the second stiffness of the optimized pedestal model 10 and determine whether the second stiffness reaches the preset stiffness;

[0067] S6. Repeat step S4 for dimensional optimization of the pedestal model 10 and step S5 until the second stiffness reaches the preset stiffness.

[0068] In step S1, refer to Figure 2 , the pedestal model 10 includes at least a web model 11, a large bracket model 12, and a panel model 13. Taking the ship length direction as the x direction, the ship width direction perpendicular to the x direction as the y direction, and the vertical direction perpendicular to both the x direction and the y direction as the z direction.

[0069] The web model 11 includes two base webs 111. The two base webs 111 are both vertically placed and symmetrically arranged along the y direction. The thickness direction of the base web 111 is along the y direction. The shaft generator 2 is placed between the two base webs 111.

[0070] Referring to Figure 3 and Figure 4 , the large gusset model 12 includes a base gusset. The base gusset includes two groups of vertically placed first large gussets 121. The two groups of first large gussets 121 are respectively located on the opposite sides of the web model 11 along the y direction, that is, the web model 11 is located between the two groups of first large gussets 121. The first large gusset 121 is connected to the base model 10. The thickness direction of the first large gusset 121 is along the x direction. Each group of first large gussets 121 includes a number of first large gussets 121 spaced apart from each other along the x direction. Optionally, each group of first large gussets 121 includes three first large gussets 121 spaced apart from each other along the x direction, and the three first large gussets 121 are evenly distributed along the x direction.

[0071] Referring to Figure 4 , the panel model 13 includes a first gusset upper panel 132, a first web upper panel 133, and a base upper panel 131. The base upper panel 131 is horizontally placed, located above the web model 11 and the large gusset model 12, and covers a part of the upper surface of the base web 111 and a part of the upper surface of the first large gusset 121. Among them, the upper surface of the base web 111 and the upper surface of the first large gusset 121 are the surfaces on the top side of the base web 111 and the first large gusset 121 along the z direction. Optionally, the base upper panel 131 covers the middle area of the upper surface of the base web 111 along the x direction and the area of the upper surface of the first large gusset 121 near one end of the base web 111, and exposes the areas on the opposite sides of the upper surface of the base web 111 along the x direction and the area of the upper surface of the first large gusset 121 far from one end of the base web 111.

[0072] A number of mounting holes 1311 are also provided in the base upper panel 131 for fixing the shaft generator 2. The shaft generator 2 can be fixedly installed on the shaft generator base 1 through the mounting holes 1311 and bolts. Optionally, the number of base upper panels 131 is two. The two base upper panels 131 are respectively arranged on the two base webs 111. And four mounting holes 1311 are provided on each base upper panel 131. The four mounting holes 1311 are sequentially spaced apart along the x direction. The base gusset is provided with grooves at positions corresponding to the mounting holes 1311 to facilitate the installation of bolts into the mounting holes 1311.

[0073] The upper panel 132 of the first gusset plate is located above the first large gusset plate 121. Looking down at the base model 10 in the z direction, the upper panel 132 of the first gusset plate is arranged on one side of the upper panel 131 of the base in the y direction and covers a part of the upper surface of the first large gusset plate 121. Optionally, the upper panel 132 of the first gusset plate covers the area of the upper surface of the first large gusset plate 121 away from one end of the base web 111. The upper panel 133 of the first web is located above the base web 111. Looking down at the base model 10 in the z direction, the upper panel 133 of the first web is arranged on at least one side of the upper panel 131 of the base in the x direction and covers a part of the upper surface of the base web 111. Optionally, the upper panel 133 of the first web is located on opposite sides of the upper panel 131 of the base in the x direction and covers at least a part of the exposed upper surface of the base web 111. Further, the upper panel 132 of the first gusset plate, the upper panel 133 of the first web, and the upper panel 131 of the base are of a discrete structure.

[0074] In step S1, referring to Figure 2 and Figure 5 , the base model 10 system further includes a strengthening structure model 20 and a double bottom model 30. The double bottom model 30 has a bottom plate 32 and an inner bottom plate 31. The base model 10 is placed on the inner bottom plate 31. The bottom surface of the base web 111 and the bottom surface of the first large gusset plate 121 are both connected to the inner bottom plate 31, and the first large gusset plate 121 and the bottom plate 32 are spaced apart from each other in the y direction. The strengthening structure model 20 is located between the bottom plate 32 and the inner bottom plate 31 and is connected to the inner bottom plate 31. The double bottom model 30 is a common double bottom structure of a ship in the prior art and will not be described in detail in this embodiment. Optionally, the strengthening structure model 20 may include, for example, a number of longitudinally distributed flat steels. The strengthening structure model 20 is located directly below the base model 10 in the z direction and is used to longitudinally strengthen the stiffness of the shaft generator base 1.

[0075] In this embodiment, the base model 10 is a model structure of the shaft generator base 1, the double bottom model 30 is a model structure of the double bottom structure of a ship, and the strengthening structure model 20 is a model structure of the strengthening structure of the ship shaft generator base 1. In practical applications, referring to Figure 6, the shaft generator 2 is placed on the shaft generator base 1, and the shaft generator base 1 is placed on the inner bottom plate 31 of the double-bottom structure of the ship. Both ends of the shaft generator 2 in the x direction are connected to the intermediate bearing 4 through elastic couplings. The intermediate bearing 4 on the side of the shaft generator 2 close to the stern is connected to the propeller propulsion system 5 through the stern tube bearing 3, and the intermediate bearing 4 on the side of the shaft generator 2 close to the bow is connected to the main engine 6, jointly forming a set of electric propulsion systems. The ship's electric propulsion system will generate huge vibrations during equipment operation, and excessive vibrations will affect the installation of the intermediate bearing 4 and the shaft generator 2. Therefore, in the design and construction of the ship, the shaft generator base 1 has high stiffness requirements to control the deformation of the base of the shaft generator 2 during operation. However, the shaft generator base 1 in the prior art often fails to meet the expected stiffness requirements. Based on this, this embodiment provides a method for optimizing the stiffness of the shaft generator base 1, which can effectively improve the stiffness of the shaft generator base 1 and meet the stiffness requirements of the shaft generator base 1 in actual production.

[0076] In step S2, by applying a load to the base model 10 and obtaining the deformation of the base model 10, the stiffness of the base model 10 can be obtained by calculating the ratio of the pressure received by the base model 10 to the deformation, and it is denoted as the first stiffness.

[0077] In an alternative embodiment, referring to Figure 7 , performing step S2 to calculate the first stiffness of the base model 10 includes the following steps:

[0078] S21. Obtain the weight of the shaft generator 2 and the positions of the mounting holes 1311;

[0079] S22. Set boundary conditions for the base system model;

[0080] S23. Apply a load to the base model 10 according to the weight of the shaft generator 2 and the positions of the mounting holes 1311;

[0081] S24. Obtain the deformation of the base model 10 after applying the load;

[0082] S25. Calculate the first stiffness of the base model 10 according to the deformation of the base model 10 and the weight of the shaft generator 2.

[0083] In steps S21 and S23, the shaft generator 2 is installed on the shaft generator base 1 through the mounting holes 1311 in cooperation with bolts. The positions of the mounting holes 1311 are the positions where the shaft generator 2 transmits pressure to the shaft generator base 1 through its weight. By obtaining the weight of the shaft generator 2 to obtain the pressure applied to the base model 10, and by obtaining the positions of the mounting holes 1311 to obtain the positions where the load is applied to the shaft generator base 1, the deformation of the shaft generator base 1 can be obtained.

[0084] In step S22, boundary conditions are set for the pedestal model 10 system to facilitate the calculation of the deformation occurring in the shaft generator pedestal 1. Optionally, performing step S22 includes the following steps: Rigid fixation conditions are set for the two opposite ends of the double-bottom model 30 in the x direction to fix the positions of the two opposite ends of the double-bottom model 30 in the x direction; that is, during the process of applying a load to the pedestal model 10, both the translational position and the rotational position of the two opposite ends of the double-bottom model 30 in the x direction remain unchanged.

[0085] In steps S24 and S25, the deformations of the pedestal model 10 in the x direction, y direction, and z direction after applying the load are respectively obtained to calculate the first stiffness of the pedestal model 10 in the x direction, y direction, and z direction. Optionally, the maximum deformations of the pedestal model 10 in the x direction, y direction, and z direction after applying the load are respectively obtained, and the first stiffness of the pedestal model 10 is calculated based on the maximum deformations.

[0086] In step S3, it is determined whether the first stiffness reaches a preset stiffness. Among them, the preset stiffness can be set according to the actual production situation; optionally, the preset stiffness can be set according to the stiffness requirements for the shaft generator pedestal 1 provided by the manufacturer. For example, the manufacturer requires that the stiffness of the shaft generator pedestal 1 in the x direction, y direction, and z direction is greater than 2*10^9 N / m.

[0087] In step S4, structural optimization and dimensional optimization are performed on the bracket model 12 and the panel model 13 in the pedestal model 10 to improve the stiffness of the shaft generator pedestal 1. Optionally, performing structural optimization on the pedestal model 10 includes the following steps: Obtaining the large bracket optimization model 14 and the panel optimization model; According to the large bracket optimization model 14 and the panel optimization model, structural optimization is performed on the bracket model 12 and the panel model 13 in the pedestal model 10; Obtaining the model 16 near the small bracket, and adding the model 16 near the small bracket to the two opposite ends of the web model 11 in the x direction.

[0088] In this embodiment, the large bracket optimization model 14 is the model structure after structurally improving the first large bracket 121 in the bracket model 12, and the panel optimization model is the model structure after structurally improving the panel model 13 in the pedestal model 10. Optionally, the steps for performing structural optimization on the bracket model 12 in the pedestal model 10 include: Replacing the first large bracket 121 in the bracket model 12 with the large bracket optimization model 14.

[0089] Refer to Figures 8 to 10, referring to the structure of the first large gusset plate 121 described above, the large gusset plate optimization model 14 also includes two sets of second large gusset plates 141. After the structure of the base model 10 is optimized, the two sets of second large gusset plates 141 are respectively located on the opposite sides of the web model 11 along the y direction, that is, the web model 11 is located between the two sets of second large gusset plates 141. The second large gusset plates 141 are respectively connected to the web model 11 and the inner bottom plate 31, and the second large gusset plates 141 extend along the y direction and are connected to the bottom plate 32; moreover, the number of each set of second large gusset plates 141 is greater than the number of each set of first large gusset plates 121. Manholes 1411 are opened in the second large gusset plates 141, and a number of stiffeners 1412 are also provided on the second large gusset plates 141.

[0090] In an alternative embodiment, the second large gusset plate 141 is connected to the second longitudinal girder of the bottom plate 32. The width of the second large gusset plate 141 along the z direction on the side away from the base web 111 is smaller than the width along the z direction on the side close to the web. A manhole 1411 with a size of 600mm * 800mm is also opened in the second large gusset plate 141 for personnel to pass through. The stiffeners 1412 are arranged on the second large gusset plate 141 at an interval of 600mm, and stiffeners 1412 are arranged in the edge area of the manhole 1411. Further, the stiffeners 1412 can be, for example, 150mm * 12mm stiffened flat bars. By extending the second large gusset plate 141 to be connected to the bottom plate 32, the bottom edge length of the connection between the second large gusset plate 141 and the inner bottom plate 31 is extended, which can effectively enhance the lateral stiffness of the shaft generator base 1, and by arranging the stiffeners 1412, the structural strength of the second large gusset plate 141 can be effectively improved.

[0091] In an alternative embodiment, each set of first large gusset plates 121 includes three first large gusset plates 121, and each set of second large gusset plates 141 includes four second large gusset plates 141. The four second large gusset plates 141 are spaced apart along the x direction.

[0092] Referring to Figure 11 , the model near the small gusset plate 16 is arranged on one side of the base web 111 along the y direction and is located at both ends of the base web 111 along the x direction. Optionally, there are four models near the small gusset plate 16. Each set of two models near the small gusset plate 16 is respectively connected to one side of a base web 111 along the y direction, and the two models near the small gusset plate 16 in the same set are symmetrically arranged at the opposite ends of the base web 111 along the x direction.

[0093] In an alternative embodiment, referring to Figure 10 and Figure 12, the panel optimization model includes the gusset-optimized upper panel 151 and the web-optimized upper panel 152; the steps of structurally optimizing the panel model 13 in the base model 10 include: using the gusset-optimized upper panel 151 and the web-optimized upper panel 152 to replace the first gusset upper panel 132 and the first web upper panel 133 respectively, and connecting the gusset-optimized upper panel 151 and the web-optimized upper panel 152 to the base upper panel 131; wherein, the gusset upper panel is located above the second large gusset 141, the web-optimized upper panel 152 is located above the base web 111, the gusset-optimized upper panel 151 includes the second gusset upper panel 1511 and the gusset interconnecting upper panel 1512, the gusset interconnecting upper panel 1512 is located between the second gusset upper panel 1511 and the base upper panel 131 and is connected to the second gusset upper panel 1511 and the base upper panel 131 respectively, the web-optimized upper panel 152 includes the web interconnecting upper panel 1522 and the second web upper panel 1521, the web interconnecting upper panel 1522 is located between the second web upper panel 1521 and the base upper panel 131 and is connected to the second web upper panel 1521 and the base upper panel 131 respectively.

[0094] Furthermore, the length of the gusset interconnecting upper panel 1512 along the x direction on the side close to the base upper panel 131 is the same as or similar to the length of the base upper panel 131 along the x direction, and the length of the gusset interconnecting upper panel 1512 along the x direction on the side far from the base upper panel 131 is less than the length of the gusset interconnecting upper panel 1512 along the x direction on the side close to the base upper panel 131. The width of the web interconnecting upper panel 1522 along the y direction on the side close to the base upper panel 131 is the same as or similar to the width of the base upper panel 131 along the y direction, and the width of the web interconnecting upper panel 1522 along the y direction on the side far from the base upper panel 131 is less than the width of the web interconnecting upper panel 1522 along the y direction on the side close to the base upper panel 131. The gusset interconnecting upper panel 1512 and the second gusset upper panel 1511 can be an integral structure or a discrete structure fixedly connected to each other, and the web interconnecting upper panel 1522 and the second web upper panel 1521 can be an integral structure or a discrete structure fixedly connected to each other. By setting the gusset-optimized upper panel 151, the web-optimized upper panel 152 and the base upper panel 131 as an interconnected integral structure, the lateral stiffness of the shaft generator base 1 can be effectively increased.

[0095] In step S4 of this embodiment, the steps of optimizing the dimensions of the base model 10 include: adjusting the width and thickness of the upper panel 1511 of the second gusset plate; and / or, adjusting the width and thickness of the upper panel 1521 of the second web plate; and / or, adjusting the width of the upper panel 131 of the base; and / or, adjusting the thickness of the second large gusset plate 141. Optionally, the width of the upper panel 131 of the base does not exceed a preset first threshold, and further, the thickness of the second large gusset plate 141 does not exceed a preset second threshold. When the width of the upper panel 131 of the base and the thickness of the second large gusset plate 141 are too large, it will significantly increase the overall mass of the structure and increase the order difficulty and cost. Therefore, by setting the first threshold and the second threshold, the width of the upper panel 131 of the base and the thickness of the second large gusset plate 141 are both controlled within a reasonable range.

[0096] In an alternative embodiment, the upper panel 132 of the first gusset plate and the upper panel 133 of the first web plate are, for example, flat steel with dimensions of 150 mm * 12 mm, and the upper panel 1511 of the second gusset plate and the upper panel 1521 of the second web plate are, for example, flat steel with dimensions of 200 mm * 35 mm. The width of the upper panel 131 of the base before optimization is 480 mm, and after optimization is 500 mm. The thickness of the first large gusset plate 121 is 35 mm, and the thickness of the second large gusset plate 141 is 40 mm.

[0097] In step S5, a load is applied to the optimized base model 10 to calculate the second stiffness of the base model 10. For the specific calculation method of the second stiffness, please refer to the calculation method of the first stiffness in step S3.

[0098] In step S6, when the second stiffness does not reach the preset stiffness, steps S4 and S5 are repeatedly executed, that is, the dimensions of the base model 10 are optimized, and the second stiffness of the optimized base model 10 is calculated, until the second stiffness reaches the preset stiffness.

[0099] In an alternative comparative example, in the base model 10 before optimization, the first large gusset plate 121 and the ship bottom plate 32 are spaced apart in the y direction, with a thickness of 35 mm. The width of the upper panel 131 of the base is 480 mm. The upper panel 132 of the first gusset plate, the upper panel 133 of the first web plate and the upper panel 131 of the base are arranged in a discrete structure. The upper panel 132 of the first gusset plate and the upper panel 133 of the first web plate are both flat steel with dimensions of 150 mm * 12 mm. The weight of the shaft generator 2 is 495 KN. Four mounting holes 1311 are evenly distributed in the x direction on each upper panel 131 of the base. Through simulation calculation of the base system model, the stiffness of the base model 10 in the x direction is 2.21 * 10^9 N / m, the stiffness in the y direction is 0.9 * 10^9 N / m, and the stiffness in the z direction is 2.661 * 10^9 N / m. Among them, the preset stiffness is 2 * 10^9 N / m, and the stiffness of the base model 10 in the y direction before optimization does not reach the preset stiffness.

[0100] In an alternative embodiment, in the optimized base model 10, the second largest gusset plate 141 extends along the y-direction to be connected to the ship bottom plate 32. A manhole 1411 with a size of 600 mm * 800 mm is provided in the second largest gusset plate 141. Reinforcing members 1412 are arranged on the second largest gusset plate 141 at intervals of 600 mm, and reinforcing members 1412 are also arranged in the edge area of the manhole 1411. The reinforcing members 1412 are flat steel with a size of 150 mm * 12 mm. The thickness of the second largest gusset plate 141 is 40 mm. The width of the upper panel 131 of the base is 500 mm. The upper panels 1511 of the second gusset plate and 1521 of the second web panel are both flat steel with a size of 200 mm * 35 mm. The weight of the shaft generator 2 is 495 KN. Four mounting holes 1311 evenly distributed along the x-direction are provided on each upper panel 131 of the base. Through simulation calculation of the base system model, the stiffness of the base model 10 in the x-direction is 2.27 * 10^9 N / m, the stiffness in the y-direction is 2.007 * 10^9 N / m, and the stiffness in the z-direction is 3.778 * 10^9 N / m. Among them, the preset stiffness is 2 * 10^9 N / m. It can be seen that the stiffness of the optimized base model 10 can meet the design requirements.

[0101] In summary, for the stiffness optimization method of the shaft generator base 1 in this embodiment, by constructing a base system model and applying loads to the base model 10, the stiffness of the base model 10 can be calculated. When the initially calculated first stiffness does not reach the preset stiffness, by optimizing the structure of the base model 10 to adjust the structural layout of the base model 10, the stiffness of the base model 10 can be increased. By performing one or more size optimizations on the base model 10 after structural optimization, the stiffness of the base model 10 can be further improved to reach the preset stiffness to meet the design requirements of the manufacturer and ensure the structural strength of the ship. Moreover, by extending the second largest gusset plate 141 along the y-direction to be connected to the ship bottom plate 32, the bottom edge length of the connection between the second largest gusset plate 141 and the inner bottom plate 31 is extended, effectively enhancing the lateral stiffness of the base model 10. By setting the optimized upper panel 151 of the gusset plate, the optimized upper panel 152 of the web and the upper panel 131 of the base as an interconnected integral structure, the lateral stiffness of the base model 10 is further enhanced. And by optimizing the structure of the base model 10, the requirements for the thickness of various plates during size optimization can be reduced, making the plates in the optimized base model 10 easy to customize, purchase and process, achieving the purpose of cost reduction, efficiency improvement and safe construction.

[0102] The above embodiments are only illustrative of the principles and effects of the present application and are not intended to limit the present application. Any person familiar with this technology can modify, change or combine the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in the present application should still be covered by the claims of the present application.

Claims

1. A method for optimizing the stiffness of a shaft generator pedestal, characterized in that It includes the following steps: S1. Establish a pedestal system model, and the pedestal system model includes a pedestal model; S2. Apply a load to the pedestal model and calculate the first stiffness of the pedestal model; S3. Determine whether the first stiffness reaches a preset stiffness; S4. When the result is "no", perform structural optimization and dimensional optimization on the pedestal model; S5. Calculate the second stiffness of the optimized pedestal model and determine whether the second stiffness reaches the preset stiffness; S6. Repeat step S4 for dimensional optimization of the pedestal model and step S5 until the second stiffness reaches the preset stiffness.

2. The stiffness optimization method of the shaft generator pedestal according to claim 1, wherein, The pedestal system model further includes a strengthening structure model and a double bottom model. The double bottom model has a ship bottom plate and an inner bottom plate. The pedestal model is located on the inner bottom plate. The strengthening structure model is located between the ship bottom plate and the inner bottom plate and is connected to the inner bottom plate.

3. The stiffness optimization method of the shaft generator pedestal according to claim 2, characterized in that, The pedestal model at least includes: A web model, including two vertically placed pedestal webs. The two pedestal webs are symmetrically arranged along the y direction, and the shaft generator is placed between the two pedestal webs; An elbow plate model, including two groups of vertically placed first large elbow plates. The two groups of first large elbow plates are respectively located on opposite sides of the web model along the y direction. The first large elbow plate is connected to the pedestal web and is spaced from the ship bottom plate along the y direction. The thickness direction of the first large elbow plate is the x direction; A panel model, including a top panel of the first elbow plate, a top panel of the first web, and a top panel of the pedestal. The top panel of the pedestal is horizontally placed and covers a part of the upper surface of the pedestal web and a part of the upper surface of the first large elbow plate. A number of mounting holes are provided in the top panel of the pedestal for fixing the shaft generator. Looking down at the pedestal model along the z direction, the top panel of the first elbow plate is arranged on one side of the top panel of the pedestal along the y direction and covers a part of the upper surface of the first large elbow plate. The top panel of the first web is arranged on at least one side of the top panel of the pedestal along the x direction and covers a part of the upper surface of the pedestal web; Wherein, the x direction is the ship length direction, the y direction is the ship width direction, the z direction is the vertical direction, and the x direction, the y direction, and the z direction are perpendicular to each other in pairs.

4. The stiffness optimization method of the shaft generator base according to claim 3, characterized in that In step S2, calculating the first stiffness of the pedestal model includes the following steps: Obtain the weight of the shaft generator and the positions of the mounting holes; Set boundary conditions for the pedestal system model; Apply a load to the pedestal model according to the weight of the shaft generator and the positions of the mounting holes; Obtain the deformation of the pedestal model after the load is applied; Calculate the first stiffness of the pedestal model according to the deformation of the pedestal model and the weight of the shaft generator.

5. The stiffness optimization method of the shaft generator pedestal according to claim 4, characterized in that The step of setting boundary conditions for the pedestal system model includes: setting rigid fixation conditions at opposite ends of the double bottom model along the x direction to fix the positions of opposite ends of the double bottom model along the x direction.

6. The stiffness optimization method of the shaft generator pedestal according to claim 3, wherein In step S4, performing structural optimization on the pedestal model includes the following steps: Obtain a large elbow plate optimization model and a panel optimization model; According to the large bracket optimization model and the panel optimization model, structurally optimize the bracket model and the panel model in the base model; Obtain a small bracket attachment model, and add the small bracket attachment model to opposite ends of the web model along the x direction.

7. The stiffness optimization method of the shaft generator base according to claim 6, characterized in that The steps for structurally optimizing the bracket model in the base model include: replacing the first large bracket in the bracket model with the large bracket optimization model; Wherein, the large bracket optimization model includes two groups of second large brackets, the two groups of second large brackets are respectively located on opposite sides of the web model along the y direction, the second large brackets are respectively connected to the web model and the inner bottom plate, and the second large brackets extend along the y direction and are connected to the ship bottom plate; and, the number of each group of second large brackets is greater than the number of each group of first large brackets, manholes are provided in the second large brackets, and a number of strengthening members are also provided on the second large brackets.

8. The stiffness optimization method of the shaft generator pedestal according to claim 7, characterized in that, The panel optimization model includes an optimized upper panel of the bracket and an optimized upper panel of the web; The steps for structurally optimizing the panel model in the base model include: respectively replacing the first upper panel of the bracket and the first upper panel of the web with the optimized upper panel of the bracket and the optimized upper panel of the web, and connecting the optimized upper panel of the bracket and the optimized upper panel of the web to the upper panel of the base respectively; Wherein, the optimized upper panel of the bracket is located above the second large bracket, the optimized upper panel of the web is located above the base web, the optimized upper panel of the bracket includes a second upper panel of the bracket and an interconnected upper panel of the bracket, the interconnected upper panel of the bracket is located between the second upper panel of the bracket and the upper panel of the base, and is respectively connected to the second upper panel of the bracket and the upper panel of the base, the optimized upper panel of the web includes an interconnected upper panel of the web and a second upper panel of the web, the interconnected upper panel of the web is located between the second upper panel of the web and the upper panel of the base, and is respectively connected to the second upper panel of the web and the upper panel of the base.

9. The stiffness optimization method of the shaft generator pedestal according to claim 8, characterized in that In step S4, the steps for dimensionally optimizing the base model include: Adjusting the width and thickness of the second upper panel of the bracket; and / or, The width and thickness of the second upper panel of the web; and / or, The width of the upper panel of the base; and / or The thickness of the second large bracket.

10. The stiffness optimization method of the shaft generator pedestal according to claim 9, characterized in that The width of the upper panel of the base along the y direction does not exceed a preset first threshold.

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