Hydrodynamic load mapping loading method in energy-saving guide wheel structure analysis

Abstract

A hydrodynamic load mapping loading method in energy-saving guide wheel structure analysis comprises the steps that firstly, hydrodynamic loads obtained through CFD analysis of a reduced scale model are extracted and expressed in the form of average pressure and pulsating pressure, data conversion from the reduced scale model to a real-scale model, formatting processing of hydrodynamic load data and mapping processing and application of the loads to the structure are carried out. In consideration of a load application mode, in order to conveniently extract model information such as a loading unit or a node required in a load processing process and in consideration of load processing complexity, an APDL language of ANSYS software is adopted to process load mapping application; meanwhile, when ANSYS software is adopted for structural analysis, all calculation tasks can be conveniently processed in the same software. The method can adapt to the CFD to calculate the dynamic water pressure by adopting the scale model, and the calculation efficiency of obtaining the water pressure in the CFD stage is greatly improved. The method is suitable for structural model unit grid division rules and irregularity conditions at the same time.

Description

Technical Field

[0001] This invention belongs to the field of marine ship construction and design, and specifically relates to a hydrodynamic load mapping and loading method in the analysis of energy-saving guide wheel structures. Background Technology

[0002] Employing energy-efficient guide wheels is one of the effective ways to improve ship speed, fuel economy, and design green and environmentally friendly vessels. In the structural analysis calculations required for energy-efficient guide wheel design, the water pressure exerted on the guide wheel by the CFD must be applied to the guide wheel structure. Currently, CFD analysis uses scaled models to improve computational efficiency, resulting in a significant difference between the computational mesh and the structural mesh. Even when CFD uses a full-scale model, it can only utilize a larger mesh for calculation, which is still far from the mesh size used in structural analysis. Therefore, the water pressure load obtained through CFD must be processed to map it onto the actual structural mesh.

[0003] There are two problems when mapping loads obtained from CFD onto the structure. One is the transformation from scaled model loads to full-scale structural loads. The other is that due to the difference between the CFD calculation grid and the structural calculation grid, accurate interpolation needs to be performed again so that the loads can be easily applied to the structure. At the same time, due to the huge number of load points during the mapping process, a reasonable algorithm needs to be constructed to improve the mapping processing efficiency.

[0004] To address the above problems and improve the convenience of structural analysis, this invention takes the loads calculated by CFD on a scaled model as input and aims to transform these input loads into loads applicable to the structure. It provides a method for transforming and processing CFD loads from scaled models to structural calculation loads. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a hydrodynamic load mapping method for energy-saving guide wheel structure analysis, the technical solution of which is as follows: A hydrodynamic load mapping method for energy-saving guide wheel structure analysis is described below: S1: Extract the hydrodynamic loads obtained from the CFD analysis of the scaled model and express them as average pressure and pulsating pressure.

[0006] S101: Design state for structural analysis of energy-saving guide wheels. This clarifies the design state for both structural and CFD hydrodynamic analysis, facilitating subsequent load transfer. It includes the definition of analysis conditions and coordinate systems. 1) Determine the operating conditions for structural analysis of the energy-saving guide wheel. The operating conditions are the hydrodynamic pressure under different combinations of incoming flow direction and propeller direction. Each operating condition is determined by the corresponding incoming flow direction angle. α and propeller azimuth angle βCharacterization.

[0007] 2) The coordinate system for structural analysis of the energy-saving guide wheel is based on the ship coordinate system. The model coordinate system is defined as follows: the origin o is taken as the center position of the propeller, and the coordinate axis direction is consistent with the ship coordinate axis direction.

[0008] S102: For each working condition, the hydrodynamic analysis software directly outputs the pressure load as a function of coordinates, and the pressure load is automatically decomposed into average pressure and pulsating pressure by the software.

[0009] For specific analysis conditions L m The pressure output format is (X,Y,Z,P,C), where P is the average pressure on the surface of the model guide wheel; and C is the single-peak pulsating pressure on the surface of the model guide wheel.

[0010] Operating conditions L m The pressure data directly output by the hydrodynamic analysis software is denoted as database Am0.

[0011] S2: Data conversion from scaled-down model to full-scale model For each working condition, the scaled model pressure load data (X,Y,Z,P,C) output by the hydrodynamic analysis software is converted into the corresponding data (Xs,Ys,Zs,Ps) of the full-scale energy-saving guide wheel.

[0012] S201: Coordinate Transformation The real-scale coordinates Xs, Ys, Zs are given by multiplying the scaled model coordinates X, Y, Z by the scaling ratio, as follows: ; ; .

[0013] Where λ is the scaling ratio.

[0014] S202: Load Transformation .

[0015] in: P s : Total pressure on the surface of the guide wheel of the actual ship, i.e., actual dimensional load, Pa.

[0016] V 0s : Actual ship's incoming current velocity, m / s.

[0017] V 0m : Velocity of the incoming current for the model ship, m / s.

[0018] n s : Propeller speed of the actual ship, 1 / s.

[0019] n m : Propeller speed of the model ship, 1 / s.

[0020] S3: Formatting of hydrodynamic load data The real-scale hydrodynamic load data processed in step S2 is processed to form an inputPm file, which is then read into the structural analysis software.

[0021] S4: Load-to-structure mapping and application Hydrodynamic load mapping is performed by limiting the search range for each structural element during the mapping process to reduce load processing time. The specific operation is as follows: S401: Define an array prelem to store the loads applied to the structural model elements. The data format is (Nu, Pele).

[0022] The array `prelem` is a J-row, 2-column array, where J is the number of elements to be loaded, Nu is the element number of the structural model, and Pele is the load value of the structural element.

[0023] S402: For each element i of the structure, perform load search and interpolation calculations to extract the center coordinates (x, y) of the structural element. i ,y i ,z i ) and unit number Nu i Based on the file inputPm, with (x i ,y i ,z i Centered on the inputPm, within a certain range, the load points in the inputPm are searched to obtain the load value Pele of the element. i .

[0024] The calculated element load value Pele i and the corresponding unit number Nu i Stored in the array prelem.

[0025] S403: Select the element to be loaded, and apply the structural load in the structural analysis software using the sfe command combined with a loop statement based on the data information in the prelem array.

[0026] Furthermore, in the above-mentioned hydrodynamic load mapping method for energy-saving guide wheel structure analysis, in step S101, the structural analysis should cover all typical operating conditions, using... Indicates the first m Each operating condition.

[0027] Furthermore, in the above-mentioned hydrodynamic load mapping method for energy-saving guide wheel structure analysis, in step S102, the database Am0 is a k-row, 5-column matrix.

[0028] Furthermore, in step S3, the structural analysis software used is ANSYS. When importing the hydrodynamic load database into ANSYS, each line of data must contain no more than 10 data points. The load data is then processed and saved as a txt file with the following format: inputPm(a,1)=Am(1+a,1),Am(2+a,1),…,Am(8+a,1),Am(9+a,1),Am(10+a,1).

[0029] inputPm(a,2)=Am(1+a,2),Am(2+a,2),…,Am(8+a,2),Am(9+a,2),Am(10+a,2).

[0030] inputPm(a,3)=Am(1+a,3),Am(2+a,3),…,Am(8+a,3),Am(9+a,3),Am(10+a,3).

[0031] inputPm(a,4)=Am(1+a,4),Am(2+a,4),…,Am(8+a,4),Am(9+a,4),Am(10+a,4).

[0032] Where a = 10 × (k - 1), inputPm(a, 1) is the x-coordinate data, inputPm(a, 2) is the y-coordinate data, inputPm(a, 3) is the z-coordinate data, and inputPm(a, 4) is the pressure data.

[0033] Furthermore, in the above-mentioned hydrodynamic load mapping method for energy-saving guide wheel structure analysis, the search range in step S4 is determined based on the geometry of the energy-saving guide wheel, and the search range is defined using polar coordinates.

[0034] Using the YZ plane as a reference, a fixed search angle is given. θ ,angle θ The angle is determined by combining the CFD load spacing magnified to real scale and the structural mesh size. θ The corresponding arc length is 3 to 5 times the average size of the structural mesh.

[0035] The above-mentioned hydrodynamic load mapping method in the analysis of an energy-saving guide wheel structure further includes, in step S4, the load value Pele i The specific calculation process is as follows: Using the XY plane as a reference, find the coordinates (x, y) of the distance from the center of the element. i ,y i ,z iThe nearest load points are labeled A, B, C, and D, and the pressure at each load point is labeled P. A ,P B ,P C ,P D The coordinates of the load points are denoted as (x, y, y). A ,y A ,z A ),(x B ,y B ,z B ), (x C ,y C ,z C ),(x D ,y D ,z D The load values ​​on the element are calculated using a weighted average interpolation method. The weights for the interpolation are the center coordinates of the element (x, y, y). i ,y i ,z i The distances between the load points A, B, C, and D and the load points are denoted as d. A d B d C d D And denote the values ​​of load points A, B, C, and D as P. A , P B , P C , P D Then the load value on this unit is: Pele i = (P A d A + P B d B + P C d C + P D d D ) / 4.

[0036] Where, distance d A d B d C d D Calculated from the coordinates of the load point and the coordinates of the element center point: .

[0037] .

[0038] .

[0039] .

[0040] Furthermore, in step S403, the hydrodynamic load mapping method in the above-mentioned energy-saving guide wheel structure analysis is further improved by using the APDL language of ANSYS software to process the load mapping application.

[0041] From the perspective of load application method, this invention uses the APDL language of ANSYS software to process load mapping application in order to facilitate the extraction of model information such as loading elements or nodes required for load processing and to take into account the complexity of load processing. At the same time, when using ANSYS software for structural analysis, it is also convenient to process all calculation tasks in the same software.

[0042] This method can adapt to the use of scaled models in CFD to calculate hydrodynamic pressure, significantly improving the computational efficiency of obtaining water pressure during the CFD stage. It is also applicable to both regular and irregular mesh generation of structural models. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the sail coordinate system definition.

[0044] Figure 2 This is a schematic diagram of the load search range for the structural model.

[0045] Figure 3 This is a schematic diagram of the load interpolation element search process for the structural model.

[0046] Figure 4 This is a schematic diagram of CFD load mapping applied to the structural model.

[0047] Figure 5 This is a schematic diagram of the hydrodynamic load mapping application method.

[0048] Figure 6 This is a schematic diagram after processing the x-coordinate data.

[0049] Figure 7 This is a schematic diagram after processing the y-coordinate data.

[0050] Figure 8 This is a schematic diagram after processing the z-coordinate data.

[0051] Figure 9 This is a schematic diagram of the pressure data P after processing.

[0052] Figure 10 This is a schematic diagram of the surface pressure distribution of the energy-saving guide wheel obtained through scaled model analysis.

[0053] Figure 11 This is a schematic diagram after data conversion and processing. Detailed Implementation

[0054] The present invention will be described in detail with reference to specific embodiments.

[0055] like Figure 5 This paper presents a hydrodynamic load mapping method for energy-saving guide wheel structure analysis.

[0056] S1: Extract the hydrodynamic loads obtained from the CFD analysis of the scaled model and express them as average pressure and pulsating pressure. Conduct hydrodynamic analysis using professional hydrodynamic analysis software and extract the dynamic water pressure based on the energy-saving guide wheel analysis conditions.

[0057] S101: Design status of energy-saving guide wheel undergoing structural analysis The design conditions for structural analysis and CFD hydrodynamic analysis are clearly defined to facilitate the subsequent load transfer, including the definition of analysis conditions and coordinate system.

[0058] 1) Determine the operating conditions for structural analysis of the energy-saving guide wheel, which are the hydrodynamic pressures under different combinations of incoming flow direction and propeller direction. Each operating condition is determined by the corresponding incoming flow direction angle. α and propeller azimuth angle β Characterization. The structural analysis should cover all typical operating conditions, using L... m (α m ,β m ) indicates the first m Each operating condition.

[0059] 2) Coordinate system for structural analysis of energy-saving guide wheels: Based on the ship coordinate system, the model coordinate system is defined as follows: The origin o is taken as the center position of the propeller. The coordinate axis direction is consistent with the ship's coordinate axis direction, such as... Figure 1 As shown.

[0060] S102: For each working condition, the hydrodynamic analysis software directly outputs the pressure load as a function of coordinates. Furthermore, the pressure load is automatically decomposed by the software into mean pressure and fluctuating pressure. This is tailored to specific analysis conditions. L m The pressure output format is (X, Y, Z, P, C), where P is the average pressure and C is the pulsating pressure. Operating condition. L m The pressure data directly output by the hydrodynamic analysis software is denoted as database Am0, which is a k-row, 5-column matrix.

[0061] In this embodiment, the surface pressure distribution of the energy-saving guide wheel (partial data) obtained through scaled model analysis is shown in one working condition as follows: Figure 10 As shown.

[0062] S2: Data conversion from scaled model to full-scale model For each working condition, the scaled model pressure load data (X,Y,Z,P,C) output by the hydrodynamic analysis software is converted into the corresponding data (Xs,Ys,Zs,Ps) of the full-scale energy-saving guide wheel.

[0063] S201: Coordinate Transformation The real-scale coordinates Xs, Ys, Zs are given by multiplying the scaled model coordinates X, Y, Z by the scaling ratio, as follows: ; ; .

[0064] Where λ is the scaling ratio.

[0065] S202: Load Transformation The real-scale load Ps is given by P, C, and related parameters as follows: .

[0066] Where: P s : Total pressure on the surface of the guide wheel of the actual ship, i.e., actual dimensional load, Pa.

[0067] P: Average pressure on the surface of the model guide wheel, Pa.

[0068] V 0s : Actual ship's incoming current velocity, m / s.

[0069] V 0m : Velocity of the incoming current for the model ship, m / s.

[0070] n s : Propeller speed of the actual ship, 1 / s.

[0071] n m : Propeller speed of the model ship, 1 / s.

[0072] C: Single-peak pulsating pressure on the surface of the model guide wheel, Pa.

[0073] In this embodiment, a working condition after data conversion processing (partial data) is as follows: Figure 11 As shown.

[0074] The real-scale hydrodynamic load data processed in step S2 needs to be converted according to the data format requirements of the structural analysis software before being applied to the structural analysis. Taking the general-purpose structural analysis software ANSYS as an example, the data needs to be converted to its usable format. The hydrodynamic load database is large, and ANSYS has strict requirements on the data format when importing loads; each line of data must not exceed 10 characters. The obtained load file is then processed and saved as a txt file for structural load mapping. The data format is denoted as: inputPm(a,1)=Am(1+a,1),Am(2+a,1),…,Am(8+a,1),Am(9+a,1),Am(10+a,1).

[0075] inputPm(a,2)=Am(1+a,2),Am(2+a,2),…,Am(8+a,2),Am(9+a,2),Am(10+a,2).

[0076] inputPm(a,3)=Am(1+a,3),Am(2+a,3),…,Am(8+a,3),Am(9+a,3),Am(10+a,3).

[0077] inputPm(a,4)=Am(1+a,4),Am(2+a,4),…,Am(8+a,4),Am(9+a,4),Am(10+a,4).

[0078] Where a = 10 × (k - 1), inputPm(a, 1) is the x-coordinate data, inputPm(a, 2) is the y-coordinate data, inputPm(a, 3) is the z-coordinate data, and inputPm(a, 4) is the pressure data.

[0079] Since the data processing in this step only involves outputting data in a specified format, it can be easily implemented using Excel, MATLAB, or other common software. This example contains a total of 43,421 rows; the x-coordinate data after processing is as follows: Figure 6 As shown.

[0080] After processing, the y-coordinate data is as follows: Figure 7 As shown.

[0081] After processing, the z-coordinate data is as follows: Figure 8 As shown.

[0082] Pressure data P after processing Figure 9 As shown.

[0083] S4: Load-to-structure mapping and application S401: Use ANSYS structural finite element analysis software to establish a structural finite element analysis model and read in the inputPm file generated in step 3.

[0084] S402: Hydrodynamic Load Mapping Processing: After the scaled model from CFD analysis is enlarged to a full-scale model, the corresponding mesh differs significantly from the mesh used in structural analysis. In particular, the structural analysis mesh is much finer, and due to the special shape of the energy-saving guide wheel, the structural mesh inevitably contains a large number of triangular or transitional elements. Therefore, load interpolation calculations, i.e., load mapping processing, are needed to map the hydrodynamic loads onto the structural model. Considering the large number of load points, the search range for each structural element is limited during the mapping process to reduce load processing time and thus improve efficiency. The specific steps are as follows: 1) Define an array prelem to store the loads applied to the structural model elements. The data format is (Nu, Pele).

[0085] The prelem is a J-row, 2-column array, where J is the number of elements to be loaded, Nu is the element number of the structural model, and Pele is the load value of the structural element.

[0086] 2) For each element i of the structure, the two main operations of load search and interpolation calculation are as follows: (1) Extract the center coordinates (x) of the structural unit i ,y i ,z i ) and unit number Nu i ; (2) Based on the database inputPm, with (x i ,y i ,z i Centered on the inputPm, a search is performed on the load points within a certain range. The search range is determined based on the geometry of the energy-saving guide wheel, using polar coordinates to define the search area. Figure 2 As shown. Using the YZ plane as a reference, a fixed search angle is given. θ The size of this angle determines the search efficiency. When θ If the search range is too large, the efficiency decreases due to the increased search area. θ If the angle is too small, the spacing of CFD loads magnified to the real scale is usually larger than that of the structural mesh, which may result in the inability to find load points in certain directions. Therefore, to improve search efficiency and ensure search success, the angle... θ The angle is typically determined by combining the CFD load spacing magnified to real scale and the structural mesh size. θ The corresponding arc length is 3 to 5 times the average size of the structural mesh.

[0087] (4) Using the XY plane as a reference, find the coordinates (x, y) of the distance from the center of the unit. i ,y i ,zi The nearest load points are numbered A, B, C, and D respectively. Figure 3 As shown. The pressure at the load point is denoted as P. A ,P B ,P C ,P D The coordinates of the load points are denoted as (x, y, y). A ,y A ,z A ),(x B ,y B ,z B ), (x C ,y C ,z C ),(x D ,y D ,z D Considering the positional difference between the CFD load points magnified to real scale and the load points of the structural model elements, a weighted average interpolation method is used to calculate the load values ​​on the elements. The weights for interpolation are the center coordinates of the element (x, y, y). i ,y i ,z i The distances between the load points A, B, C, and D and the load points are denoted as d. A d B d C d D And denote the values ​​of load points A, B, C, and D as P. A , P B , P C , P D Then the load value on this unit is: Pele i = (P A d A + P B d B + P C d C + P D d D ) / 4 Where, distance d A d B d C d D Calculated from the coordinates of the load point and the coordinates of the element center point: .

[0088] .

[0089] .

[0090] .

[0091] (5) The calculated element load value Pele i and the corresponding unit number Nu i Stored in the array prelem.

[0092] The array prelem calculated in this embodiment is shown below: Unit number Pressure load value 87138 -0.00985886 87139 -0.00538320 87140 -0.00952213 87141 -0.01269840 87142 -0.01428698 87143 -0.00410450 87144 9.94285816 87145 -0.00950620 87146 -0.00429260 87147 -0.00205614 Unit number Pressure load value 95263 -0.00821988 95264 0.00911545 95265 -0.01097484 95266 -0.01371017 95267 0.00464349 95268 -0.00234123 95269 -0.00793140 95270 0.00629017 95271 -0.05289261 95272 -0.04536773

[0093] S403: Select the element to be loaded, and apply the structural load in ANSYS structural analysis software using the sfe command combined with a loop statement based on the data information in the prelem array. ×do,j,1,J sfe,prs_elem(j,1),,pres,,-prs_elem(j,2) ×enddo The final load after loading in this embodiment is as follows: Figure 4 As shown.

Claims

1. A hydrodynamic load mapping and loading method in the structural analysis of an energy-saving guide wheel, characterized in that, The specific steps are as follows: S1: Extract the hydrodynamic loads obtained from the CFD analysis of the scaled model and express them as mean pressure and pulsating pressure. S101: Design status for structural analysis of energy-saving guide wheels, clarifying the design status for structural analysis and CFD hydrodynamic analysis, including analysis conditions and coordinate system definitions: 1) Determine the operating condition for structural analysis of the energy-saving guide wheel, which is the inflow direction. α relative to propeller direction β Hydrodynamic pressure under different combinations; 2) The coordinate system for structural analysis of the energy-saving guide wheel is based on the ship coordinate system. The model coordinate system is defined as follows: the origin O is taken as the center position of the propeller, and the coordinate axis direction is consistent with the ship coordinate axis direction. S102: For each working condition, the hydrodynamic analysis software directly outputs the pressure load as a function of coordinates, and the pressure load is automatically decomposed into average pressure and pulsating pressure by the software; For the specific analysis condition Lm, the pressure output format is (X,Y,Z,P,C), where P is the average pressure on the surface of the model guide wheel; and C is the single-peak pulsating pressure on the surface of the model guide wheel. Operating conditions L m The pressure data directly output by the hydrodynamic analysis software is denoted as database Am0; S2: Data conversion from scaled-down model to full-scale model For each working condition, the scaled model pressure load data (X,Y,Z,P,C) output by the hydrodynamic analysis software is converted into the corresponding data (Xs,Ys,Zs,Ps) of the full-scale energy-saving guide wheel. S201: Coordinate Transformation The real-scale coordinates Xs, Ys, Zs are given by multiplying the scaled model coordinates X, Y, Z by the scaling ratio, as follows: ; ; ; Where λ is the scaling ratio; S202: Load Transformation ; Among them, P s : Total pressure on the surface of the guide wheel of the actual ship, i.e., actual dimensional load, Pa; V 0s : Actual ship's incoming current velocity, m / s; V 0m : Velocity of the incoming current for the model ship, m / s; n s : Actual ship propeller speed, 1 / s; n m Model ship propeller speed, 1 / s; S3: Formatting of hydrodynamic load data The real-scale hydrodynamic load data processed in step S2 is processed to form an inputPm file, which is then read into the structural analysis software. S4: Load-to-structure mapping and application Hydrodynamic load mapping is performed by limiting the search range for each structural element during the mapping process to reduce load processing time. The specific operation is as follows: S401: Define an array prelem to store the loads applied to the structural model elements, with the data format (Nu, Pele); S402: For each element i of the structure, perform load search and interpolation calculations to extract the center coordinates (x, y) of the structural element. i ,y i ,z i ) and unit number Nu i Based on the file inputPm, with (x i ,y i ,z i Centered on the inputPm, within a certain range, the load points in the inputPm are searched to obtain the load value Pele of the element. i ; The calculated element load value Pele i and the corresponding unit number Nu i Stored in the array prelem; S403: Select the element to be loaded, and apply the structural load in the structural analysis software using the sfe command combined with a loop statement based on the data information in the prelem array.

2. The hydrodynamic load mapping and loading method in the structural analysis of an energy-saving guide wheel according to claim 1, characterized in that, In step S101, the structural analysis should cover all typical operating conditions, using... Indicates the first m Each operating condition.

3. The hydrodynamic load mapping and loading method in the structural analysis of an energy-saving guide wheel according to claim 1, characterized in that, In step S102, the database Am0 is a k-row, 5-column matrix.

4. The hydrodynamic load mapping and loading method in the structural analysis of an energy-saving guide wheel according to claim 1, characterized in that, The structural analysis software is ANSYS. When importing the hydrodynamic load database into ANSYS, each line of data should contain no more than 10 data points. The load data should be processed and saved as a txt file. The data format is as follows: inputPm(a,1)=Am(1+a,1),Am(2+a,1),…,Am(8+a,1),Am(9+a,1),Am(10+a,1); inputPm(a,2)=Am(1+a,2),Am(2+a,2),…,Am(8+a,2),Am(9+a,2),Am(10+a,2); inputPm(a,3)=Am(1+a,3),Am(2+a,3),…,Am(8+a,3),Am(9+a,3),Am(10+a,3); inputPm(a,4)=Am(1+a,4),Am(2+a,4),…,Am(8+a,4),Am(9+a,4),Am(10+a,4); Where a = 10 × (k - 1), inputPm(a, 1) is the x-coordinate data, inputPm(a, 2) is the y-coordinate data, inputPm(a, 3) is the z-coordinate data, and inputPm(a, 4) is the pressure data.

5. The hydrodynamic load mapping and loading method in the structural analysis of an energy-saving guide wheel according to claim 1, characterized in that, In step S4, the search range is determined based on the geometry of the energy-saving guide wheel, and polar coordinates are used to define the search range. Using the YZ plane as a reference, a fixed search angle is given. θ ,angle θ The angle is determined by combining the CFD load spacing magnified to real scale and the structural mesh size. θ The corresponding arc length is 3 to 5 times the average size of the structural mesh.

6. The hydrodynamic load mapping and loading method in the structural analysis of an energy-saving guide wheel according to claim 1, characterized in that, In step S4, the load value Pele i The specific calculation process is as follows: Using the XY plane as a reference, find the coordinates (x, y) of the distance from the center of the element. i ,y i ,z i The nearest load points are labeled A, B, C, and D, and the pressure at each load point is labeled P. A ,P B ,P C ,P D The coordinates of the load points are denoted as (x, y, y). A ,y A ,z A ),(x B ,y B ,z B ), (x C ,y C ,z C ),(x D ,y D ,z D The load values ​​on the element are calculated using a weighted average interpolation method, with the weights of the interpolation being the center coordinates (x, y) of the element. i ,y i ,z i The distances between the load points A, B, C, and D and the load points are denoted as d. A d B d C d D And denote the values ​​of load points A, B, C, and D as P. A , P B , P C , P D Then the load value on this unit is: Pele i = (P A d A + P B d B + P C d C + P D d D ) / 4; Where, distance d A d B d C d D Calculated from the coordinates of the load point and the coordinates of the element center point: ； ； ； 。 7. The hydrodynamic load mapping and loading method in the structural analysis of an energy-saving guide wheel according to claim 1, characterized in that, In step S403, the APDL language of ANSYS software is used to process the load mapping application.

8. The hydrodynamic load mapping and loading method in the structural analysis of an energy-saving guide wheel according to claim 1, characterized in that, In step S401, the array prelem is a J-row, 2-column array, where J is the number of elements to be loaded, Nu is the element number of the structural model, and Pele is the load value of the structural element.

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