Equivalent construction method of special-shaped structural plate

Abstract

The invention relates to an equivalent construction method of a special-shaped structure plate. The method comprises the following steps: collecting point set data of surface shape parameters of the special-shaped structure plate; if the precision of the point set data is not enough, performing encryption operation on the point set data by using an interpolation function; importing the point set data into an interpolation function model for training, and enabling the interpolation function model to obtain a predicted value conforming to set fitting precision through multiple times of adjustment and iteration; grid nodes are re-divided within the distribution range of the special-shaped structure plates, and X and Y coordinate values of each node are calculated and determined; utilizing an interpolation function to obtain a corresponding height Z coordinate value, and reconstructing outer surface space shape data of the special-shaped structure plate; and calculating the equivalent thickness He of the equivalent flat plate. Compared with the prior art, the method is suitable for various types of special-shaped plates, the subsequent modeling difficulty and the requirement for the computing power are greatly reduced, the computing efficiency is improved, and the simplified special-shaped plates are basically consistent with the original plates in use in multiple aspects.

Description

Technical Field

[0001] The invention belongs to the technical field of heat exchanger plates and relates to an equivalent construction method for special-shaped structural plates. Background Art

[0002] Due to its excellent energy-saving effect, the high-efficiency heat exchanger with bubbling plate has gradually been recognized and accepted by everyone, and has broad application prospects and a large market. In the current dual-carbon context, the market not only requires equipment with high heat exchange efficiency, but also puts forward higher requirements for the safety and reliability of the plate bundle. Traditionally, the research is generally conducted on single-piece or double-piece bubbling plates, which cannot reflect the characteristics of the entire plate bundle. Therefore, it is necessary to study the characteristics of the entire plate bundle; but the size of the plate bundle is generally large and the structure is relatively complex. The overall simulation has high requirements for modeling capabilities and calculations. Some structures may not be obtained through modeling. Therefore, the bubbling plate equivalent method can well solve this problem, providing a theoretical basis and foundation for the design of more efficient and safer heat exchangers.

[0003] The research on special-shaped plates in the relevant literature mostly studies the characteristics of single plates or double plates (Xiao Peng, Zhang Yanfeng, Bai Bofeng. Numerical simulation study of bubble plate heat transfer elements [C]. 2013 Annual Conference of Multiphase Flow of China Society of Engineering Thermophysics. China Society of Engineering Thermophysics, 2013; Chen Quan, Pan Xuguang, Zhou Qingquan, Xi Pengfei, Gao Ming, Zhang Lixin. Comparison of RBF and BP neural network prediction of heat transfer performance of countercurrent bubble plate evaporative condenser [J]. Modeling and Simulation, 2022, 11(1): 88-100; Liu Jianyong. Analysis of heat transfer performance and strength of new bubble plate [D]. South China University of Technology, 2011.), lacking overall consideration of the plate bundle. As for the methods for equivalent special-shaped structural plates to flat plates, the equivalent method of Zhang Tieliang et al. (Zhang Tieliang, Ding Yunliang, Jin Haibo. Comparative analysis of equivalent models of honeycomb sandwich plate structures [J]. Chinese Journal of Applied Mechanics, 2011, 28(3): 275-282) is only applicable to the technical field of equivalent model construction of honeycomb sandwich structures; while the equivalent method of Li Zengguang et al. (patent CN114861478A) is mainly applicable to flat composite structural plates, and there is little research on the equivalent of single-layer special-shaped structural plates. Summary of the Invention

[0004] The purpose of the present invention is to provide an equivalent construction method for special-shaped structural plates in order to overcome at least one defect of the above-mentioned prior art. The present invention is applicable to various forms of special-shaped plates, greatly reducing the subsequent modeling difficulty and computing power requirements, improving calculation efficiency, and after simplification, it is basically consistent with the original plate in many aspects of use.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] One of the technical solutions of the present invention is to provide an equivalent construction method for a special-shaped structural plate, the method comprising the following steps:

[0007] S1. Collecting point set data of surface shape parameters of special-shaped structural plates;

[0008] Point set data includes X, Y and Z coordinates. X and Y coordinates represent the position on the plane, and Z coordinate represents the height.

[0009] S2. Since the point set data in step S1 may have insufficient precision, which may affect the accuracy of subsequent calculations, if the precision of the point set data in step S1 is sufficient, jump directly to step S5. If the precision of the point set data is insufficient, an interpolation function can be used to encrypt the point set data.

[0010] S3, importing the point set data in step S1 into the interpolation function model in step S2 for training, and after multiple adjustments and iterations, the interpolation function model is able to obtain a prediction value that meets the set fitting accuracy;

[0011] S4. Re-divide the grid nodes within the distribution range of the special-shaped structural panels as required, and determine the density of the grid nodes required to be divided within the area based on the required accuracy and level of detail;

[0012] Calculate and determine the X and Y coordinate values of each node based on the determined division range and node density;

[0013] Generate grid nodes within the division range according to the calculated node coordinates;

[0014] Using the interpolation function in step S2, prediction is performed based on the X and Y coordinate values of each node to obtain the corresponding height Z coordinate value, thereby reconstructing the outer surface spatial shape data of the special-shaped structural plate that meets the requirements;

[0015] S5. Using the external surface spatial shape data in step S4 or the point set data in step S1, with each grid space or the area between every two data points as a microelement, a certain number of microelement sections are taken in the X and Y directions of the plate as needed. Combined with the thickness H of the special-shaped structural plate, the moments of inertia Jx and Jy of the special-shaped structural plate in the X and Y axis directions at different cross-sections are calculated. Then, the average bending moment of inertia value Je of the cross-section is obtained, and the equivalent thicknesses Hx and Hy of the equivalent flat plate in the X and Y directions are inferred. Then, the equivalent thickness He of the equivalent flat plate is calculated using the idea of the mean.

[0016] As a preferred technical solution, in step S1 , point set data of surface shape parameters of the special-shaped structural plate are collected using commercial software or through 3D scanning.

[0017] Furthermore, in step S2, the interpolation function adopts a radial basis function (RBF) neural network, a decision tree (DecisionTree) or a Bayesian network (Bayesian Network) to construct an interpolation function model relationship.

[0018] As a preferred technical solution, the fitting accuracy in step S3 is 0.005 to 0.01.

[0019] Furthermore, in step S3, the root mean square error between the predicted result of the interpolation function model and the actual result is calculated to evaluate the fitting effect of the model;

[0020] Compare the calculated root mean square error with the set fitting accuracy. If the root mean square error does not reach the set fitting accuracy, you need to continue adjusting the model or increase the training data iteration until the set fitting accuracy requirements are met.

[0021] As a preferred technical solution, the accuracy in step S4 is 0.005 to 0.01.

[0022] As a preferred technical solution, the division of the grid nodes in step S4 can be uniform division or irregular division according to actual needs.

[0023] Furthermore, in step S5, the moments of inertia Jx and Jy of the special-shaped structural plate in the X-axis and Y-axis directions at different cross sections are calculated in combination with the thickness H of the special-shaped structural plate. The calculation formula of the moment of inertia is as follows:

[0024] Jx=Lx×H 3 / 12

[0025] Jy=Ly×H 3 / 12

[0026] Where Lx is the length in the X-axis direction, and Ly is the length in the Y-axis direction.

[0027] Furthermore, in step S5, the average bending moment of inertia Je of the cross section is obtained. The calculation formula of the average bending moment of inertia is as follows:

[0028] Je=(Jx+Jy) / 2

[0029] Where Jx is the moment of inertia about the X axis, and Jy is the moment of inertia about the Y axis.

[0030] Furthermore, in step S5, the calculation formula of the moment of inertia is used to inversely deduce the equivalent thickness Hx and Hy of the cross section of the equivalent flat plate in the X-axis and Y-axis directions. The calculation formula of the equivalent thickness is as follows:

[0031] Hx=(12×Je / Lx) 1 / 3

[0032] Hy=(12×Je / Ly) 1 / 3

[0033] Where Je is the average bending moment of inertia of the cross section, Lx is the length in the X-axis direction, and Ly is the length in the Y-axis direction.

[0034] Furthermore, in step S5, the equivalent thickness He of the equivalent plate is calculated using the idea of mean value. The calculation formula of the equivalent thickness is as follows:

[0035] He=(Hx+Hy) / 2

[0036] Where Hx is the equivalent thickness of the cross section in the X-axis direction, and Hy is the equivalent thickness of the cross section in the Y-axis direction.

[0037] Furthermore, based on the outer surface spatial shape data in step S4, the concept of microelement is used to calculate and accumulate the surface area and volume of each microelement to obtain the surface area of the outer surface of the entire plate and the volume of the internal space.

[0038] Furthermore, using the principle of equal weight, the equivalent density Re of the equivalent plate is calculated, and the calculation formula for the equivalent thickness is as follows:

[0039] Re=M / (Lx×Ly×He)

[0040] Where M is the weight of the special-shaped structural plate, which is equivalent to the weight of the equivalent flat plate of the structure, Lx is the length in the X-axis direction, Ly is the length in the Y-axis direction, and He is the equivalent thickness of the equivalent flat plate.

[0041] Furthermore, it is considered that the thickness and elastic modulus are in a certain proportional relationship. According to the elastic modulus E0 of the special-shaped structure plate, the elastic modulus Ex and Ey in the X-axis and Y-axis directions are calculated. The calculation formula of the elastic modulus is as follows:

[0042] Ex=E0×(Hx / He) 3

[0043] Ey=E0×(Hy / He) 3

[0044] Where Hx is the equivalent thickness of the cross section in the X-axis direction, Hy is the equivalent thickness of the cross section in the Y-axis direction, and He is the equivalent thickness of the equivalent flat plate;

[0045] Then, the equivalent elastic modulus Ee of the equivalent plate 3 is calculated using the idea of mean. The calculation formula of the equivalent elastic modulus is as follows:

[0046] Ee=(Ex+Ey) / 2.

[0047] According to the surface area of the outer surface, the volume of the inner space and the equivalent thickness He of the special-shaped structural plate, a reconstructed equivalent plate is generated, and the average bending moment of inertia Je, the equivalent density Re and the elastic modulus Ee of the equivalent plate are specified.

[0048] As a preferred technical solution, the plate bundles of equivalent flat plates corresponding to the special-shaped structural plates are connected to a distributor, and the distributor is connected to a feed pipe;

[0049] The fluid flows into the distributor through the feed pipe, and then flows into the plate bundle of the equivalent flat plate through the distributor for heat exchange and other process operations.

[0050] One of the technical solutions of the present invention is to provide an equivalent construction device for special-shaped structural plates, which implements the described method. The device includes a data acquisition module, a model training module, an iterative fitting module and a demand calculation module. The data acquisition module obtains point set data of surface shape parameters of the special-shaped structural plates. The model training module imports the point set data into the interpolation function model for training. The iterative fitting module enables the interpolation function model to obtain a predicted value that meets the set fitting accuracy after multiple adjustments and iterations. The demand calculation module obtains the characteristics of the special-shaped structural plates or equivalent flat plates according to the requirements.

[0051] One of the technical solutions of the present invention is to provide an equivalent construction device for special-shaped structural panels, comprising a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the described method.

[0052] One of the technical solutions of the present invention is to provide a computer-readable storage medium having a computer program stored thereon, which implements the steps of the method when executed by a processor.

[0053] One of the technical solutions of the present invention is to provide a computer program product, comprising a computer program, which implements the steps of the method when executed by a processor.

[0054] Compared with the prior art, the present invention has the following beneficial effects:

[0055] (1) Wide range of applications: The present invention is applicable to various forms of special-shaped plates, such as corrugated plates, bubble plates, square wave plates and various types of concave and convex plates and other plate and shell structures;

[0056] (2) Good practicality: After structural equivalence, the present invention can convert a complex structure into a uniform flat plate, greatly reducing the difficulty of subsequent modeling and the requirements for computing power. In particular, using the present invention as a pre-step for studying the vibration characteristics of plate beams can quickly complete the model establishment, greatly improving the efficiency of calculations.

[0057] (3) High precision: The simplified model used in the present invention is compared with the original plate, which has high compliance and can fully meet the requirements of engineering and scientific research;

[0058] (4) Wide range of applications: The simplified model of the present invention can be used for calculations of structural fields and vibration properties. The method of forming a uniform grid surface can also be used for computational fluid dynamics (CFD) calculations of structural modeling or 3D printing of spatial body reconstruction. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 Schematic diagram of the process of an equivalent construction method of a special-shaped structural plate in an embodiment of the present invention;

[0060] Figure 2 Schematic diagram of the structure of the special-shaped structural plate (corrugated plate) in Example 1 of the present invention;

[0061] Figure 3 Schematic diagram of the structure of the special-shaped structural plate (bubble plate) in Example 2 of the present invention;

[0062] Figure 4 Schematic diagram of the connection structure between the equivalent flat plate and the distributor in an embodiment of the present invention;

[0063] Figure 5 It is a partially enlarged schematic diagram of the connection structure between the equivalent flat plate and the distributor in an embodiment of the present invention.

[0064] Description of the marks in the figure:

[0065] 1—corrugated plate, 2—pillow bubbling plate, 21—pillow upper plate, 22—pillow lower plate, 23—pillow plate gap, 3—equivalent flat plate, 4—distributor, 5—feed pipe. DETAILED DESCRIPTION

[0066] The present invention is described in detail below with reference to specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0067] The present invention provides an equivalent construction method for special-shaped structural plates, such as Figure 1 The specific steps are as follows:

[0068] S1. Collecting point set data of the surface shape parameters of the special-shaped structural plate using commercial software (such as simulation software Ansys or 3D modeling software SolidWorks) or by 3D scanning. In this embodiment, 3D scanning is preferred;

[0069] Point set data is usually represented by X, Y and Z coordinates, where the X and Y coordinates represent the position on the plane, and the Z coordinate represents the height;

[0070] S2. Since the point set data in step S1 may have insufficient precision, which may affect the accuracy of subsequent calculations, if the precision of the point set data in step S1 is sufficient, then jump directly to step S5. If the precision of the point set data is insufficient, then an interpolation function can be used to encrypt the point set data. The following describes this process in detail using a radial basis function (RBF) neural network interpolation function model as an example;

[0071] First, set the fitting accuracy, then call the newrb function to use the radial basis function neural network to build the interpolation function model relationship;

[0072] S3, selecting to import the point set data in step S1 into the radial basis function neural network interpolation function model in step S2 for training, and after multiple adjustments and iterations, enabling the interpolation function model to obtain a prediction value that meets the set fitting accuracy;

[0073] Then the root mean square error between the predicted results of the interpolation function model and the actual results is calculated to evaluate the fitting effect of the model;

[0074] Compare the calculated root mean square error with the set fitting accuracy. If the root mean square error does not reach the set fitting accuracy, you need to continue adjusting the model or increase the training data iteration until the set fitting accuracy requirement is met.

[0075] S4. Re-divide the grid nodes within the distribution range of the special-shaped structural panels as required, and determine the density of the grid nodes required to be divided within the area based on the required accuracy and level of detail;

[0076] Calculate and determine the X and Y coordinate values of each node based on the determined division range and node density;

[0077] Generate grid nodes within the division range according to the calculated node coordinates;

[0078] According to actual needs, uniform division or irregular division can be adopted. In this embodiment, uniform division is preferred.

[0079] Using the interpolation function in step S2, prediction is performed based on the X and Y coordinate values of each node to obtain the corresponding height Z coordinate value, thereby reconstructing the outer surface spatial shape data of the special-shaped structural plate that meets the requirements;

[0080] S5. Using the outer surface spatial shape data in step S4 or the point set data in step S1, each grid space or the space between two data points is regarded as a microelement. The surface area and volume of each microelement are calculated and accumulated to obtain the surface area of the outer surface of the entire plate and the volume of the internal space.

[0081] S6. Based on the external surface spatial shape data in step S4, using the concept of micro-element, a certain number of micro-element sections are taken in the X and Y directions of the plate as needed. Combined with the thickness H of the special-shaped structure plate, the moments of inertia Jx and Jy of the special-shaped structure plate in the X and Y directions at different cross-sections are calculated. The calculation formula of the moment of inertia is as follows:

[0082] Jx=Lx×H 3 / 12

[0083] Jy=Ly×H 3 / 12

[0084] Where Lx is the length in the X-axis direction, and Ly is the length in the Y-axis direction;

[0085] Then calculate the average bending moment of inertia Je of the cross section. The calculation formula of the average bending moment of inertia is as follows:

[0086] Je=(Jx+Jy) / 2;

[0087] And using the calculation formula of the moment of inertia, the equivalent thickness Hx and Hy of the equivalent plate 3 in the X-axis and Y-axis directions are inferred. The calculation formula of the equivalent thickness is as follows:

[0088] Hx=(12×Je / Lx) 1 / 3

[0089] Hy=(12×Je / Ly) 1 / 3 ;

[0090] Then, the equivalent thickness He of the equivalent plate 3 is calculated using the idea of mean. The calculation formula of the equivalent thickness is as follows:

[0091] He=(Hx+Hy) / 2;

[0092] S7. Using the principle of equal weight, calculate the equivalent density Re of the equivalent plate 3. The calculation formula for the equivalent thickness is as follows:

[0093] Re=M / (Lx×Ly×He)

[0094] Where M is the weight of the special-shaped structural plate, which is equivalent to the weight of the equivalent flat plate 3 constructed;

[0095] At the same time, it is believed that the thickness and elastic modulus are in a certain proportional relationship. According to the elastic modulus E0 of the special-shaped structure plate, the elastic modulus Ex and Ey in the X-axis and Y-axis directions are calculated. The calculation formula of the elastic modulus is as follows:

[0096] Ex=E0×(Hx / He) 3

[0097] Ey=E0×(Hy / He) 3 ;

[0098] Then, the equivalent elastic modulus Ee of the equivalent plate 3 is calculated using the idea of mean. The calculation formula of the equivalent elastic modulus is as follows:

[0099] Ee=(Ex+Ey) / 2;

[0100] S8. Generate a reconstructed equivalent flat plate 3 based on the surface area of the outer surface and the volume of the inner space of the special-shaped structural plate in step S5 and the equivalent thickness He in step S6, and specify the average bending moment of inertia Je in step S6 and the equivalent density Re and equivalent elastic modulus Ee of the equivalent flat plate 3 in step S7.

[0101] like Figure 4 and Figure 5 As shown, the plate bundle of the equivalent flat plate 3 corresponding to the special-shaped structure plate is connected to the distributor 4 by welding, and the distributor 4 is connected to the feed pipe 5 by welding;

[0102] The fluid flows into the distributor 4 through the feed pipe 5, and then flows into the plate bundle of the equivalent flat plate 3 through the distributor 4 to perform process operations such as heat exchange;

[0103] After the special-shaped structural plate is equivalent, the connection modeling with the distributor 4 becomes simpler and can be achieved by using an equivalent flat plate model, which can save more than 50% of the modeling time. At the same time, since the model becomes simpler, the calculation time can also be shortened by 30%.

[0104] Example 1:

[0105] An equivalent construction method for special-shaped structural plates (corrugated plates) has been successfully applied to Figure 2 In the field of research on the structure and equivalent stiffness of the corrugated plate 1 shown, the method of equivalent flat plate of the present invention provides a new, efficient and accurate solution for similar structural calculations and equivalent stiffness (deformation) calculations.

[0106] According to the present invention, it can be concluded that the thickness H0 of the corrugated plate 1 in Example 1 is 2.0 mm and the density R0 is 7850 kg / m 3When the fitting accuracy is 0.005, the equivalent thickness He of the equivalent plate 3 is 2.8 mm and the equivalent density Re is 8280 kg / m 3 Under the same boundary conditions, the calculation results using the equivalent flat plate 3 are very similar to those using the corrugated plate. The deformation error between the two is only 8%, which is acceptable in simplified calculations and verifies the reliability and accuracy of the method of the present invention.

[0107] Example 2:

[0108] An equivalent construction method for a special-shaped structure plate (bubble plate) is to equate the complex pillow-type bubble plate 2 to a simple flat plate model, such as Figure 3 As shown, the pillow-type bubbling plate 2 includes a pillow-type upper plate 21 and a pillow-type lower plate 22. A pillow-type plate gap 23 is provided between the pillow-type upper plate 21 and the pillow-type lower plate 22. The pillow-type plate gap 23 allows fluid to flow through. The method of equivalent flat plate of the present invention can be used for natural frequency research.

[0109] Through the present invention, the equivalent results of the pillow-type bubble sheet 2 in Example 2 are obtained. The thickness H0 of the pillow-type bubble sheet 2 is 2.5 mm, and the density R0 is 7850 kg / m 3 When the elastic modulus E0 is 1.95e+11Pa, the equivalent surface area of the equivalent plate 3 is 4364mm when the fitting accuracy is 0.005. 2 , the space volume is 9145.70mm 3 The moment of inertia Jx of the pillow bubble plate 2 in the X-axis direction is 3120 mm 4 , the moment of inertia Jy about the Y axis is 5410 mm 4 , the average bending moment of inertia Je is 4265mm 4 , the equivalent thickness Hx of the equivalent plate 3 in the X-axis direction is deduced to be 9.09 mm, the equivalent thickness Hy of the equivalent plate 3 in the Y-axis direction is 9.08 mm, and the equivalent thickness He is 9.085 mm. Based on the calculated volume and the weight M of the original plate, the equivalent density Re is calculated to be 4320 kg / m 3 By calculating the product of the equivalent thickness ratio (He) and the original elastic modulus (E0), the equivalent elastic modulus (Ee) is calculated to be 1.95e+11Pa. Calculations show that using the equivalent flat plate 3 can accurately predict the various frequencies and vibration modes of the pillow-type bubble plate 2, meeting the requirements of engineering calculations. Under identical boundary conditions, the results calculated using the equivalent flat plate 3 are minimally different from those using the bubble plate. The error in the various frequencies is only 5-10%, which is acceptable for simplified calculations and verifies the reliability and accuracy of the method presented herein.

[0110] The above description of the embodiments is intended to facilitate understanding and use of the invention by those skilled in the art. It will be apparent that those skilled in the art can readily make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the present invention is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention, without departing from the scope of the present invention, should be within the scope of protection of the present invention.

Claims

1. A method for equivalent construction of special-shaped structural plates, characterized in that: The method comprises the following steps: S1. Collecting point set data of surface shape parameters of special-shaped structural plates; Point set data includes X, Y and Z coordinates. X and Y coordinates represent the position on the plane, and Z coordinate represents the height. S2. If the accuracy of the point set data in step S1 is sufficient, then jump directly to step S5. If the accuracy of the point set data is not sufficient, then encrypt the point set data using an interpolation function. S3, importing the point set data in step S1 into the interpolation function model in step S2 for training, and after multiple adjustments and iterations, the interpolation function model obtains a prediction value that meets the set fitting accuracy; S4. Re-dividing the grid nodes within the distribution range of the special-shaped structural panels and determining the density of the grid nodes divided within the region; Calculate and determine the X and Y coordinate values of each node based on the determined division range and node density; Using the interpolation function in step S2, the X and Y coordinate values of each node are predicted to obtain the corresponding height Z coordinate value, and the outer surface spatial shape data of the special-shaped structural plate is reconstructed; S5. Using the outer surface spatial shape data of the plate obtained in step S4 or the point set data in step S1, with each grid space or the area between every two data points as a microelement, a certain number of microelement sections are taken in the X and Y directions of the plate, respectively, to calculate the moments of inertia Jx and Jy of the special-shaped structural plate in the X and Y axis directions at different sections, then calculate the average bending moment of inertia value Je of the section, and inversely deduce the equivalent thicknesses Hx and Hy of the equivalent flat plate in the X and Y direction sections, and then use the idea of the mean to calculate the equivalent thickness He of the equivalent flat plate.

2. The equivalent construction method of a special-shaped structural plate according to claim 1, characterized in that: In step S2, the interpolation function uses a radial basis function neural network, a decision tree or a Bayesian network to construct an interpolation function model relationship.

3. The equivalent construction method of a special-shaped structural plate according to claim 1, characterized in that: In step S3, the root mean square error between the predicted result of the interpolation function model and the actual result is calculated, and the calculated root mean square error is compared with the set fitting accuracy. If the root mean square error does not reach the set fitting accuracy, the model is continuously adjusted or the training data iteration is increased until the set fitting accuracy requirement is met.

4. The equivalent construction method of a special-shaped structural plate according to claim 1, characterized in that: In step S5, the moments of inertia Jx and Jy of the special-shaped structural plate in the X-axis and Y-axis directions at different cross sections are calculated based on the thickness H of the special-shaped structural plate. The calculation formula of the moment of inertia is as follows: Jx=Lx×H 3 / 12 You=Ly×H 3 / 12 Where Lx is the length in the X-axis direction, and Ly is the length in the Y-axis direction.

5. The equivalent construction method of a special-shaped structural plate according to claim 1, characterized in that: In step S5, the average bending moment of inertia Je of the cross section is obtained. The calculation formula of the average bending moment of inertia is as follows: Je=(Jx+Jy) / 2 Where Jx is the moment of inertia about the X axis, and Jy is the moment of inertia about the Y axis.

6. The equivalent construction method of a special-shaped structural plate according to claim 1, characterized in that: In step S5, the calculation formula of the moment of inertia is used to inversely deduce the equivalent thickness Hx and Hy of the equivalent flat plate in the X-axis and Y-axis directions. The calculation formula of the equivalent thickness is as follows: Hx=(12×Je / Lx) 1 / 3 Hy=(12×Je / Ly) 1 / 3 Where Je is the average bending moment of inertia of the cross section, Lx is the length in the X-axis direction, and Ly is the length in the Y-axis direction.

7. The equivalent construction method of a special-shaped structural plate according to claim 1, characterized in that: In step S5, the equivalent thickness He of the equivalent plate is calculated using the idea of mean value. The calculation formula of the equivalent thickness is as follows: He=(Hx+Hy) / 2 Where Hx is the equivalent thickness of the cross section in the X-axis direction, and Hy is the equivalent thickness of the cross section in the Y-axis direction.

8. The equivalent construction method of a special-shaped structural plate according to claim 1, characterized in that: Based on the outer surface spatial shape data in step S4, the idea of microelement is used to calculate and accumulate the surface area and volume of each microelement to obtain the surface area of the outer surface of the entire plate and the volume of the internal space.

9. The equivalent construction method of a special-shaped structural plate according to claim 1, characterized in that: Using the principle of equal weight, the equivalent density Re of the equivalent plate is calculated, and the calculation formula for the equivalent thickness is as follows: Re=M / (Lx×Ly×He) Where M is the weight of the special-shaped structural plate, which is equivalent to the weight of the equivalent flat plate of the structure, Lx is the length in the X-axis direction, Ly is the length in the Y-axis direction, and He is the equivalent thickness of the equivalent flat plate.

10. The equivalent construction method of a special-shaped structural plate according to claim 1, characterized in that: Assuming that the thickness and elastic modulus are in a certain proportional relationship, the elastic modulus Ex and Ey in the X-axis and Y-axis directions are calculated based on the elastic modulus E0 of the special-shaped structure plate. The calculation formula of the elastic modulus is as follows: Ex=E0×(Hx / He) 3 Ey=E0×(Hy / He) 3 Where Hx is the equivalent thickness of the cross section in the X-axis direction, Hy is the equivalent thickness of the cross section in the Y-axis direction, and He is the equivalent thickness of the equivalent flat plate; Then, the equivalent elastic modulus Ee of the equivalent plate 3 is calculated using the idea of mean. The calculation formula of the equivalent elastic modulus is as follows: Ee=(Ex+Ey) / 2.

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