Design method and design system for parameters of stainless steel floating disc of filling structure

Abstract

The invention discloses a design method and a design system for parameters of a stainless steel floating disc of a filling structure, and belongs to the technical field of computer aided design. The design method comprises the following steps: S1, acquiring target conditions of the stainless steel floating disc of the filling structure, and designing a solid floating disc according to the target conditions; s2, according to the thickness of the solid floating disc, the sectional inertia moment of the solid floating disc is calculated; s3, designing a filling structure stainless steel floating disc, and calculating the sectional inertia moment of the filling structure stainless steel floating disc; s4, calculating the overall elastic modulus of the stainless steel floating disc of the filling structure; s5, deformation of the stainless steel floating disc of the filling structure is obtained through deformation of the solid floating disc; s6, if the deformation of the stainless steel floating disc of the filling structure meets the requirement, completing the design, and if the deformation does not meet the requirement, executing S7; and S7, modifying parameters of the filling structure stainless steel floating disc, and then calculating stress and deformation of the filling structure stainless steel floating disc until the stress and deformation of the filling structure stainless steel floating disc meet design requirements.

Description

Technical Field

[0001] The invention belongs to the technical field of computer-aided design, and in particular relates to a design method and a design system for parameters of a stainless steel floating plate with a filling structure. Background Art

[0002] As an indispensable equipment in the modern industrial field, floating roof storage tanks are widely used in the storage of various liquid substances. In the structural design of floating roof storage tanks, the floating plate plays a vital role, and its performance is directly related to the service life, safety performance and energy saving and emission reduction effect of the entire storage tank. At present, the common floating plates on the market are mainly divided into metal floating plates. However, due to the limitations of their structure and materials, the main problem of metal floating plates is that their non-fully liquid-contacted structural design leads to insufficient overall stiffness. In order to overcome these problems, researchers have gradually developed rib-filled stainless steel floating plates, which use honeycomb aluminum or other fillers inside to increase stiffness. However, to date, research on the structural parameter design method of rib-filled stainless steel floating plates is still blank. This issue mainly involves the following three aspects:

[0003] First of all, the boundary conditions of the floating disk are not perfect constraints, that is, not all boundaries are fixed or simply supported, so it is difficult to directly use the analytical method of elastic mechanics to solve. The method given in the relevant standards of my country is a method of simplifying boundary conditions, that is, connecting the pillars into lines and simplifying the entire boundary of the floating disk into a simple support or fixed support for calculation, so as to solve the analytical solution of the floating disk force and use the solution as a reference. However, due to the over-simplification of boundary conditions, this method is quite different from the force under the actual support of the floating disk, and it is impossible to obtain the accurate force conditions of the floating disk.

[0004] Secondly, the stainless steel honeycomb structure floating plate is composed of a variety of materials, and the honeycomb sandwich is not continuous and solid, so it is impossible to use the calculation method of isotropic materials for calculation. This brings difficulties to the structural parameter design of the reinforced rib filled stainless steel floating plate.

[0005] Thirdly, when using finite element calculation, since the filling structure design contains millions of honeycomb panels, the calculation model is too large, and even a dedicated computer cannot perform finite element calculation directly.

[0006] In view of these problems, it is particularly important to design and develop a design method and system for the parameters of the stainless steel floating plate with a filling structure. Summary of the invention

[0007] The purpose of the present invention is to meet practical needs and provide a design method and a design system for parameters of a stainless steel floating plate with a filling structure, which can accurately design material parameters and structural parameters of the stainless steel floating plate with a filling structure.

[0008] The first object of the present invention is to provide a method for designing parameters of a stainless steel floating plate with a filling structure, wherein the stainless steel floating plate with a filling structure comprises an upper plate and a lower plate, and a honeycomb interlayer is bonded between the upper plate and the lower plate; the design method comprises:

[0009] S1. Obtain target conditions of a stainless steel floating plate with a filling structure, and design a solid floating plate according to the target conditions; the parameters of the solid floating plate include elastic modulus, thickness, stress and deformation of the solid floating plate;

[0010] S2. Calculate the cross-sectional moment of inertia of the solid floating disk according to the thickness of the solid floating disk and on the premise that the width remains unchanged;

[0011] S3. Under the same width, the infill structure stainless steel floating plate is designed based on the section inertia moment of the solid floating plate, and the section inertia moment of the infill structure stainless steel floating plate is calculated;

[0012] S4. Calculate the overall elastic modulus of the stainless steel floating plate with a filling structure: use simulation and three-point bending test to obtain the overall elastic modulus of the stainless steel floating plate with a filling structure through loading force and deformation;

[0013] S5. Compare the overall elastic modulus of the stainless steel floating plate with the filling structure with the elastic modulus of the solid floating plate. Based on the inversely proportional relationship between the elastic modulus and the deformation, obtain the deformation of the stainless steel floating plate with the filling structure through the deformation of the solid floating plate.

[0014] S6. If the deformation of the stainless steel floating plate of the filling structure meets the requirements, the design is completed. If the deformation of the stainless steel floating plate of the filling structure does not meet the requirements, execute S7.

[0015] S7. First, modify the parameters of the stainless steel floating plate of the filling structure, and then calculate the stress and deformation of the stainless steel floating plate of the filling structure until the stress and deformation of the stainless steel floating plate of the filling structure meet the design requirements; the modification of the parameters of the stainless steel floating plate of the filling structure includes at least one of the following a)-e):

[0016] a) modifying the material of the upper plate and / or the lower plate to thereby change the elastic modulus of the upper plate and / or the lower plate;

[0017] b) changing the elastic modulus of the honeycomb interlayer by changing the material of the honeycomb interlayer;

[0018] c) Modify the height of the honeycomb sandwich;

[0019] d) Modify the wall thickness of the honeycomb sandwich;

[0020] e) Modify the thickness of the upper and / or lower plates.

[0021] Preferably, the target conditions include that any position on the floating top of the filling structure stainless steel floating plate can withstand 0.1m 2 The concentrated live load within the range is not less than 2.2kN.

[0022] Preferably, in S1, the deformation includes flexural deformation. When the solid floating plate undergoes flexural deformation, the calculation formula of stress and deflection is specifically:

[0023]

[0024] Where: w max is the maximum deflection of the solid floating plate, σ max is the maximum stress of the solid floating disk; u is the Poisson's ratio of the solid floating disk, q is the loading force on the solid floating disk, R is the radius of the solid floating disk, E is the elastic modulus of the solid floating disk, and t is the thickness of the solid floating disk.

[0025] Preferably, in S3, the cross-sectional inertia moment of the stainless steel floating plate of the filling structure is I z , the specific calculation formula is as follows:

[0026]

[0027] I i is the centroid principal moment of inertia of the upper plate, honeycomb sandwich section and lower plate respectively;

[0028] a i are the areas of the upper plate, honeycomb sandwich section and lower plate respectively;

[0029] A i It is the distance from the centroid of the upper plate, honeycomb sandwich section and lower plate to the centroid coordinate of the entire section.

[0030] Preferably, in S4, the calculation formula of the overall elastic modulus E of the stainless steel floating plate of the filling structure determined by the three-point bending test is:

[0031]

[0032] Where: E is the overall elastic modulus of the stainless steel floating plate of the filling structure, F is the central loading force, w max is the maximum deflection, I z is the section moment of inertia and l is the span.

[0033] The second object of the present invention is to provide a design system for parameters of a stainless steel floating plate with a filling structure, wherein the stainless steel floating plate with a filling structure comprises an upper plate and a lower plate, and a honeycomb interlayer is bonded between the upper plate and the lower plate; the design system comprises:

[0034] A solid floating plate design module is used to obtain target conditions of a stainless steel floating plate with a filling structure and to design a solid floating plate according to the target conditions; the parameters of the solid floating plate include elastic modulus, thickness, stress and deformation of the material of the solid floating plate;

[0035] A solid floating plate cross-sectional inertia moment calculation module is used to calculate the cross-sectional inertia moment of the solid floating plate according to the thickness of the solid floating plate and under the premise that the width remains unchanged;

[0036] The module for calculating the moment of inertia of the cross section of the infilled stainless steel floating plate is used to design the infilled stainless steel floating plate based on the moment of inertia of the cross section of the solid floating plate under the same width, and calculate the moment of inertia of the cross section of the infilled stainless steel floating plate;

[0037] The overall elastic modulus calculation module of the infilled structure stainless steel floating plate is used to calculate the overall elastic modulus of the infilled structure stainless steel floating plate: the overall elastic modulus of the infilled structure stainless steel floating plate is obtained by the loading force and deformation using a three-point bending test;

[0038] The deformation calculation module of the filling structure stainless steel floating plate compares the overall elastic modulus of the filling structure stainless steel floating plate with the elastic modulus of the solid floating plate, wherein the overall elastic modulus of the filling structure stainless steel floating plate is smaller than the elastic modulus of the solid floating plate; based on the inversely proportional relationship between the elastic modulus and the deformation, the deformation of the filling structure stainless steel floating plate is obtained through the deformation of the solid floating plate;

[0039] Design result analysis module: if the deformation of the stainless steel floating plate of the filling structure meets the requirements, the design is completed; if the deformation of the stainless steel floating plate of the filling structure does not meet the requirements, S7 is executed;

[0040] The design parameter adjustment module first modifies the parameters of the stainless steel floating plate of the filling structure, and then calculates the stress and deformation of the stainless steel floating plate of the filling structure until the stress and deformation of the stainless steel floating plate of the filling structure meet the design requirements; the modification of the parameters of the stainless steel floating plate of the filling structure includes at least one of the following a)-e):

[0041] a) modifying the material of the upper plate and / or the lower plate to thereby change the elastic modulus of the upper plate and / or the lower plate;

[0042] b) changing the elastic modulus of the honeycomb interlayer by changing the material of the honeycomb interlayer;

[0043] c) Modify the height of the honeycomb sandwich;

[0044] d) Modify the wall thickness of the honeycomb sandwich;

[0045] e) Modify the thickness of the upper and / or lower plates.

[0046] Preferably, the target conditions include that any position on the floating top of the filling structure stainless steel floating plate can withstand 0.1m 2 The concentrated live load within the range is not less than 2.2kN.

[0047] Preferably, in the solid floating plate design module, the deformation includes flexural deformation. When the solid floating plate undergoes flexural deformation, the calculation formula of stress and deflection is specifically as follows:

[0048]

[0049] Where: w max is the maximum deflection of the solid floating plate, σ max is the maximum stress of the solid floating disk; u is the Poisson's ratio of the solid floating disk, q is the loading force on the solid floating disk, R is the radius of the solid floating disk, E is the elastic modulus of the solid floating disk, and t is the thickness of the solid floating disk.

[0050] Preferably, in the calculation module of the moment of inertia of the cross section of the stainless steel floating plate of the filling structure:

[0051] The cross-sectional inertia moment of the stainless steel floating plate of the filling structure is I z , the specific calculation formula is as follows:

[0052]

[0053] I i is the centroid principal moment of inertia of the upper plate, honeycomb sandwich section and lower plate respectively;

[0054] a i are the areas of the upper plate, honeycomb sandwich section and lower plate respectively;

[0055] A i It is the distance from the centroid of the upper plate, honeycomb sandwich section and lower plate to the centroid coordinate of the entire section.

[0056] Preferably, in the overall elastic modulus calculation module of the stainless steel floating plate of the filling structure, the overall elastic modulus E of the stainless steel floating plate of the filling structure determined by the three-point bending test is calculated as follows:

[0057]

[0058] Where: E is the overall elastic modulus of the stainless steel floating plate of the filling structure, F is the central loading force, w max is the maximum deflection, I z is the section moment of inertia and l is the span.

[0059] Compared with the prior art, this application has the following advantages and positive effects:

[0060] The present invention mainly conducts in-depth research and innovation on the structure of reinforced rib-filled stainless steel floating plate, and on this basis, proposes a new calculation method for determining the material parameters and structural parameters of the reinforced rib-filled stainless steel floating plate. These parameters are crucial to the design of the floating plate, and they will directly affect the performance of the floating plate.

[0061] In terms of material parameters, the present invention mainly considers the elastic modulus of the honeycomb sandwich, the elastic modulus of the upper plate and the lower plate. The elastic modulus of the honeycomb sandwich is an important indicator to measure its anti-deformation ability, while the elastic modulus of the upper plate and the lower plate is related to the overall rigidity of the floating plate. Through the precise calculation and selection of these material parameters, it can be ensured that the floating plate has excellent stability and durability during operation.

[0062] In terms of structural parameters, the present invention mainly considers the thickness of the upper plate, the thickness of the lower plate, the wall thickness of the honeycomb interlayer, and the spacing of the honeycomb interlayer. The thickness of the upper plate and the lower plate directly affects the strength and rigidity of the floating plate, while the wall thickness and spacing of the honeycomb interlayer are related to the deadweight and stability of the floating plate. Through the reasonable design and selection of these structural parameters, it can be ensured that the floating plate can maintain good performance under various working conditions.

[0063] In general, the present invention provides a method for calculating the material parameters and structural parameters of a rib-filled stainless steel floating plate, which will provide an important basis and guidance for the design of the rib-filled stainless steel floating plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0065] Figure 1 The structural diagram of the stainless steel floating plate for filling structure;

[0066] Figure 2 It is a schematic diagram of the division of the solid floating disk in the preferred embodiment of the present invention;

[0067] Figure 3 Graph showing the main stresses and their distribution when the solid floating disk is flexurally deformed in a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0068] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.

[0069] like Figure 1 As shown, the filling structure stainless steel floating plate includes: an upper plate 1, a honeycomb interlayer 2 and a lower plate 3; the honeycomb interlayer 2 is bonded between the upper plate 1 and the lower plate 3; because there are too many filling sheets inside this structure (millions of honeycomb sheets), it is currently impossible to directly calculate by simulation (computer computing power is limited), therefore, the present application considers using the following method to solve this problem.

[0070] A method for designing parameters of a stainless steel floating plate with a filling structure, comprising:

[0071] S1. Obtain target conditions of a stainless steel floating plate with a filling structure, and design a solid floating plate according to the target conditions; the parameters of the solid floating plate include elastic modulus, thickness, stress and deformation of the solid floating plate;

[0072] The target conditions include any position on the floating top of the infill structure stainless steel floating plate being subjected to a 0.1m 2 For example, according to GB50341-2014 "Vertical Cylindrical Steel Welded Oil Tank Design Specifications" 9.1.6: In the supported state and floating state, any part of the floating roof should be able to withstand a concentrated live load of not less than 2.2kN within the range. 2 The concentrated live load within the range is not less than 2.2kN (equivalent to a uniformly distributed load of 0.022MPa).

[0073] S2. Calculate the cross-sectional moment of inertia of the solid floating disk according to the thickness of the solid floating disk and on the premise that the width remains unchanged;

[0074] S3. Under the same width, the infill structure stainless steel floating plate is designed based on the section inertia moment of the solid floating plate, and the section inertia moment of the infill structure stainless steel floating plate is calculated;

[0075] S4. Calculate the overall elastic modulus of the stainless steel floating plate with a filling structure: use simulation and three-point bending test to obtain the overall elastic modulus of the stainless steel floating plate with a filling structure through loading force and deformation;

[0076] S5. Compare the overall elastic modulus of the stainless steel floating plate with the filling structure with the elastic modulus of the solid floating plate, wherein the overall elastic modulus of the stainless steel floating plate with the filling structure is smaller than the elastic modulus of the solid floating plate; based on the inversely proportional relationship between the elastic modulus and the deformation, the deformation of the stainless steel floating plate with the filling structure is obtained through the deformation of the solid floating plate;

[0077] S6. If the deformation of the stainless steel floating plate of the filling structure meets the requirements, the design is completed. If the deformation of the stainless steel floating plate of the filling structure does not meet the requirements, execute S7.

[0078] S7. First, modify the parameters of the stainless steel floating plate of the filling structure, and then calculate the stress and deformation of the stainless steel floating plate of the filling structure until the stress and deformation of the stainless steel floating plate of the filling structure meet the design requirements; the modification of the parameters of the stainless steel floating plate of the filling structure includes:

[0079] a) Modify the material of the upper plate and / or the lower plate to change the elastic modulus of the upper plate and / or the lower plate; specifically: change the stainless steel grade and select stainless steel material with a larger or smaller elastic modulus to make the upper plate and the lower plate;

[0080] b) Changing the elastic modulus of the honeycomb sandwich by changing the honeycomb material;

[0081] c) Modify the height of the honeycomb sandwich;

[0082] d) Modify the wall thickness of the honeycomb sandwich;

[0083] e) Increase the thickness of the upper and lower plates.

[0084] The technical details are described in detail below:

[0085] 1) Calculation of stress and deflection of a solid floating plate when it is flexed and deformed under the condition of fixed support pillars. Since manual calculation only involves the case of all surrounding fixed supports, the coefficients of this formula are unknown, and the stress and deflection of this specific floating plate support can only be obtained through software.

[0086] According to the stress formula when the fixed disk is subjected to force, the stress and deflection of the thin plate when it is bent and deformed are related to the boundary conditions (determined by coefficients k1 and k2), Poisson's ratio u, load q, maximum span R of the floating support, elastic modulus E and thickness t. A thin plate refers to a plate with a diameter greater than 5-8 times the thickness, which can be regarded as a thin plate;

[0087] The parameters k1 and k2 are obtained based on elastic mechanics, but due to the limitations of boundary conditions (number and distribution of pillars), the values ​​of parameters k1 and k2 cannot be directly obtained.

[0088]

[0089] Note: For thin plate bending, the calculation formulas behind k1 and k2 are known, but k1 and k2 are different due to different boundary conditions. Even for floating plates, there are different pillar distributions, so k1 and k2 cannot be calculated analytically. max is the maximum deflection of the solid floating plate, σ max is the maximum stress of the solid floating disk; u is the Poisson's ratio of the solid floating disk, q is the loading force on the solid floating disk, R is the radius of the solid floating disk, E is the elastic modulus of the solid floating disk, and t is the thickness of the solid floating disk.

[0090] Since the boundary conditions are floating plate pillars, not circumferential fixed supports or simple supports, k1 and k2 cannot be determined analytically.

[0091] According to the size of the floating plate, determine the distribution of the floating plate pillars. Figure 2 Taking the floating platform shown in the figure as an example, according to the standard requirements, the distance between two floating platform pillars cannot be greater than 7m. When the floating platform pillars are distributed in a certain manner, the forces in various areas of the floating platform are basically the same. The innermost circle of the floating platform is analyzed as a thin plate, with 4 pillars and a diameter of 5242mm.

[0092] The discrete solution of the solid floating plate under stress is obtained by the finite element method. When the grid is small enough, the stress and deformation values ​​at discrete points on the floating plate can be obtained, and the maximum stress and maximum deflection values ​​can be extracted. When the solid floating plate structure is constant, the maximum span R of the floating plate pillar is a fixed value, and then the Poisson's ratio u of the floating plate, the elastic modulus E of the solid floating plate and the force q are set as constants, and the thickness of the solid floating plate is set as a variable parameter. Finite element calculation is performed to obtain the maximum stress and deformation of the floating plate under specific floating plate pillar distribution conditions, and substitute it into formula 1 to solve the stress coefficient k1 and deformation coefficient k2 of the solid floating plate when bending with small deflection.

[0093] Table 1 is the deformation coefficient calculation table

[0094]

[0095] Table 2 is the stress coefficient calculation table

[0096]

[0097] It can be seen from this that under the small deflection bending condition, the undetermined parameters in equation (1) are k1=0.00097 and k2=0.0067.

[0098]

[0099] 2) Calculation of the moment of inertia of the honeycomb floating plate

[0100] According to the thin plate small deflection bending mechanics analysis, such as Figure 3 shown.

[0101] When the thin plate is bent, the main stress is the bending normal stress σ in the xy direction x , σ y and shear stress τ xy ; The secondary stress is the shear stress τ xz , τ yz and the extrusion stress σ z ;

[0102]

[0103] For a rectangular beam with a width and height of b·t, the stress in bending is calculated as follows:

[0104]

[0105] Beam stress calculation formula and beam section moment of inertia I z The calculation formula for .

[0106] σ is stress; M is bending moment, and z is the distance from the stress point to the neutral axis. z is the moment of inertia, b is the width, and t is the height, which is the thickness of the honeycomb floating plate.

[0107] It turns out that:

[0108] σ x The difference between σ and σ is the width of the beam, that is, when the thin plate and the beam are subjected to force during flexural deformation, the main stress is the bending normal stress. Since it is difficult to test the flexural performance of thin plates, beams are used instead for parameter calculation and experimental verification, and finally the parameters are substituted into the floating plate to complete the final verification.

[0109] According to the thickness of the solid floating disk, when the elastic modulus of the solid floating disk is E=1 GPa, the calculated stress and deformation of the solid floating disk are shown in Table 3. The target parameters are selected according to the stress and deformation requirements of the composite material-honeycomb floating disk, as shown in Table 3.

[0110] Table 3 shows the stress and deformation of the solid floating plate.

[0111]

[0112] Using the following formula, the deflections and stresses corresponding to a certain number of different thicknesses are calculated. Table 3 shows only a portion of them.

[0113]

[0114] The stress and deflection of the solid floating plate are obtained. Assume that the stress of the sixth set of data meets the design conditions of the floating plate, and the thickness is 4 cm. The stress is only related to the moment of inertia of the cross section. Therefore, the moment of inertia of the cross section of the designed honeycomb structure is the same as that of the 4 cm solid cross section, and the maximum stress of the honeycomb structure floating plate is also the same. Because the deformation is also related to the elastic modulus E, the deformation is still uncertain;

[0115] For example, taking one set of data as the target parameters for the design stress and deformation of the rib-filled stainless steel floating plate, when the inertia moment of the honeycomb floating plate structure is consistent with the inertia moment corresponding to the thickness of the solid floating plate of the target parameter, the stress of the two is roughly the same during flexural deformation (considering that the honeycomb structure of the honeycomb floating plate is a hollow structure, to a certain extent, it locally affects the stress of the material, but the impact is not large, and the overall structural stress is still determined by the section inertia moment). The deformation of the rib-filled stainless steel floating plate also depends on the overall elastic modulus of the rib-filled stainless steel floating plate structure.

[0116] According to the honeycomb structure sizes available on the market, materials are selected, suitable honeycomb structures are selected, and moment of inertia calculations are performed to make the moment of inertia of the designed section of the honeycomb structure basically consistent with the moment of inertia of the target parameter solid floating disk.

[0117] When the honeycomb width is b, the hexagon side length is l, the wall thickness is δ, the thickness is t, the lower plate thickness is δ1, and the upper plate thickness is δ2; calculate the section inertia moment:

[0118] Approximate number of honeycomb walls:

[0119]

[0120] The honeycomb structure is divided into the upper plate, the honeycomb sandwich section and the lower plate. It can be seen that when the bottom surface of the lower plate is taken as the coordinate origin, the centroid coordinate z of the entire section is c for:

[0121]

[0122] From this, the section moment of inertia of the honeycomb is calculated:

[0123]

[0124] Among them, I i is the centroid principal moment of inertia of the upper plate, honeycomb sandwich section and lower plate respectively;

[0125] a i are the areas of the upper plate, honeycomb sandwich section and lower plate respectively;

[0126] A i The coordinate z of the centroid of the upper plate, honeycomb sandwich section and lower plate to the centroid of the entire sectionc distance.

[0127] Compare the calculated moment of inertia of the section with that of the solid floating plate. If the two are different, continue to adjust the parameters until the comparison results of the two are the same.

[0128] For example, the width of the honeycomb, the thickness of the honeycomb, the height of the honeycomb, the thickness of the upper plate, the thickness of the lower plate, etc. can be adjusted.

[0129] The moment of inertia of the section can also be calculated by 3D software. That is, the moment of inertia of the section of the honeycomb sandwich can also be solved by 3D modeling. A honeycomb disk with a diameter of b is cut from different angles through the center of the disk. Figure 1 shown.

[0130] The section inertia moment formed by cutting the disc is shown in the table. Because at 0° and 60°, a certain face of the honeycomb hexagon is cut, the moment of inertia formed is relatively large, and this data cannot be used as a reference for the moment of inertia of the floating disc design. The section inertia moment formed when cutting at other angles is 11530000mm 4 ~13290000mm 4 The difference is 15.3%, and the section moment of inertia corresponding to most angle cutting is 12790000mm 4 ~12860000mm 4 Therefore, the minimum value can be 11530000mm 4 The section inertia moment under the honeycomb structure parameters is used as the basis for calculation.

[0131] Table 4 shows the moment of inertia of the honeycomb disk section

[0132] angle <![CDATA[Moment of inertia of cross-section (mm 4 )]]> angle <![CDATA[Moment of inertia of cross-section (mm 4 )]]> 0° 25225831 (not used as reference) 35° 12856342 5° 13288659 40° 12797336 10° 12865353 45° 12732934 15 12732934 50° 12865353 20° 12797336 55° 13288659 25° 12856342 60° 25225831 (not used as reference) 30° 11537940

[0133] 3) Calculation of the neutral layer position and overall elastic modulus of the honeycomb floating plate section, that is, calculation of the elastic modulus of the overall structure after the honeycomb and the upper and lower plates are combined.

[0134] When designing a honeycomb floating plate, it is necessary to ensure that the design thickness of the lower plate is greater than the design thickness of the upper plate. At this time, when the floating plate is damaged by force, it can ensure that the lower plate of the floating plate fails last, so as to prevent the lower plate from breaking first and then the oil entering the floating plate. Therefore, the neutral layer of the floating plate cross section is not at any position of the cross section. (Because the thickness of the upper plate is less than the thickness of the lower plate, the neutral layer is not in the center of the cross section)

[0135] A honeycomb beam model with a width of b, a honeycomb height of t, a lower plate thickness of δ1, and an upper plate thickness of δ2 is established, and a three-point bending simulation analysis is performed, in which the support distance is l, the elastic modulus of the upper plate is set to E1 (if the materials of the upper and lower plates are the same, E1=E2, if the materials are different, it can also be calculated), the elastic modulus of the lower plate is set to E2, and the elastic modulus of the honeycomb material is set to E3.

[0136] Because of this composite structure, the elastic modulus of each material is different, and there is a hollow inside, so the overall elastic modulus cannot be calculated. In this case, finite element simulation can be selected for calculation.

[0137] Taking a honeycomb beam of a certain size as an example, the theoretical values ​​of its simulation calculation under three-point bending are shown in the following table.

[0138] Table 5 shows the theoretical results of three-point bending of a certain size of cellular beam

[0139] Head pressure (kN) 2 4 6 8 Pressure head displacement (mm) 8.8 17.6 26.5 35.3 Upper plate stress (MPa) 24.9 49.2 72.6 99.8 Lower plate stress (MPa) 17.7 35.4 53.1 70.0 Upper plate stress / lower plate stress 1.407 1.390 1.368 1.426

[0140] The honeycomb beam three-point bending specimens were made and subjected to three-point bending tests.

[0141] Since the neutral layer is offset, the position of the neutral layer can be calculated first.

[0142] The thickness of the upper and lower plates of the rib-filled stainless steel floating plate is different, and the neutral layer will be offset to a certain extent, resulting in different stresses in the upper and lower plates. That is, when the size parameters are constant, the position of the neutral layer is constant, the stress of the upper plate / the stress of the lower plate is a constant value, and the results of theoretical calculations are 1.407, 1.390, 1.368 and 1.426 respectively, and the average value is 1.398.

[0143] According to the stress formula of simply supported beam:

[0144]

[0145] Where M is the bending moment, and y is the distance from the point farthest from the neutral layer in the cross section of the bending specimen to the neutral layer.

[0146] If y1 is the distance between the upper plate and the neutral layer, y2 is the distance between the lower plate and the neutral layer.

[0147]

[0148] Using formula (10), calculate y1 and y2;

[0149] The calculation is performed using a honeycomb with a height of 100 mm, an upper plate thickness of 2 mm, and a lower plate thickness of 3 mm as an example.

[0150]

[0151] get

[0152]

[0153] Substitute the stress data into the formula

[0154]

[0155] Get the section inertia moment I of the honeycomb beam z .

[0156] The following is the cross-sectional inertia moment I z to verify.

[0157] Convert this data into the cross-section of a solid beam and calculate the corresponding thickness of the solid beam using the following formula.

[0158]

[0159] Compare the calculated thickness h with the h of the reference solid disk designed previously. If the two are the same, the calculation ends here and all the data are reliable. If the two are different, it means the calculation is wrong.

[0160] For example, for a honeycomb beam with a width of 92.9 mm and a three-point bending span of 910 mm, according to the previous data, when the three-point bending loading force is 2000 N, the maximum stress is 24.9 MPa.

[0161]

[0162] The cross-sectional height of the solid beam is calculated as follows:

[0163]

[0164] Then, the overall elastic modulus of the stainless steel honeycomb beam is obtained through the deflection calculation formula of the three-point bending beam:

[0165]

[0166] When the pressure is 2000N, the maximum bending deformation is 8.8mm. Substituting into the above formula 14, the overall elastic modulus E of the stainless steel honeycomb beam is obtained.

[0167] Calculate with the above data. When the loading force is 2000N, the maximum flexural deformation is 8.8mm. Substituting into the formula, we get:

[0168]

[0169] The data is compared with the initial deflection in Table 6 (E = 1Gpa corresponding deflection). For example, the moment of inertia of the rib-filled stainless steel floating plate is consistent with the thickness of a 3cm solid floating plate. At this time, the rib-filled stainless steel floating plate is applied with 2.2kN / 0.1m 2 When loaded, the floating plate deforms to 5481 / 1.8, thus obtaining the deformation value of the rib-filled stainless steel floating plate.

[0170] Alternatively, the deflection is calculated by substituting the solid structure thickness and elastic modulus corresponding to the inertia moment of the honeycomb structure floating plate into the stress and deformation formula of the floating plate under the support condition of the floating plate pillars.

[0171]

[0172] Table 6 shows the applied load, stress and initial deflection at different thicknesses

[0173]

[0174]

[0175] If the obtained deformation value is within the acceptable range, it means that the design parameters are accurate. If the deformation is too large, the following methods can be used to increase the overall elastic modulus of the honeycomb structure and then re-check until it meets the use requirements:

[0176] a) Modify the material of the upper plate and / or the lower plate to change the elastic modulus of the upper plate and / or the lower plate; specifically: replace the stainless steel grade, and select the upper plate and the lower plate of stainless steel material with a larger or smaller elastic modulus;

[0177] b) changing the elastic modulus of the honeycomb interlayer by changing the material of the honeycomb interlayer;

[0178] c) Modify the height of the honeycomb sandwich;

[0179] d) Modify the wall thickness of the honeycomb sandwich;

[0180] e) Modify the thickness of the upper and / or lower plates.

[0181] Then recalculate to obtain the honeycomb structure parameters that meet the conditions.

[0182] A design system for parameters of a stainless steel floating plate with a filling structure, used to implement the design method for parameters of a stainless steel floating plate with a filling structure, comprising:

[0183] A solid floating plate design module is used to obtain target conditions of a stainless steel floating plate with a filling structure and to design a solid floating plate according to the target conditions; the parameters of the solid floating plate include elastic modulus, thickness, stress and deformation of the material of the solid floating plate;

[0184] A solid floating plate cross-sectional inertia moment calculation module is used to calculate the cross-sectional inertia moment of the solid floating plate according to the thickness of the solid floating plate and under the premise that the width remains unchanged;

[0185] The module for calculating the moment of inertia of the cross section of the infilled stainless steel floating plate is used to design the infilled stainless steel floating plate based on the moment of inertia of the cross section of the solid floating plate under the same width, and calculate the moment of inertia of the cross section of the infilled stainless steel floating plate;

[0186] The overall elastic modulus calculation module of the infilled structure stainless steel floating plate is used to calculate the overall elastic modulus of the infilled structure stainless steel floating plate: the overall elastic modulus of the infilled structure stainless steel floating plate is obtained by means of simulation and three-point bending test through loading force and deformation;

[0187] The deformation calculation module of the filling structure stainless steel floating plate compares the overall elastic modulus of the filling structure stainless steel floating plate with the elastic modulus of the solid floating plate, wherein the overall elastic modulus of the filling structure stainless steel floating plate is smaller than the elastic modulus of the solid floating plate; based on the inversely proportional relationship between the elastic modulus and the deformation, the deformation of the filling structure stainless steel floating plate is obtained through the deformation of the solid floating plate;

[0188] Design result analysis module: if the deformation of the stainless steel floating plate of the filling structure meets the requirements, the design is completed; if the deformation of the stainless steel floating plate of the filling structure does not meet the requirements, S7 is executed;

[0189] The design parameter adjustment module first modifies the parameters of the filling structure stainless steel floating plate, and then calculates the stress and deformation of the filling structure stainless steel floating plate until the stress and deformation of the filling structure stainless steel floating plate meet the design requirements; the parameters of the modified filling structure stainless steel floating plate include:

[0190] a) Modify the material of the upper plate and / or the lower plate to change the elastic modulus of the upper plate and / or the lower plate; specifically: replace the stainless steel grade, and select the upper plate and the lower plate of stainless steel material with a larger or smaller elastic modulus;

[0191] b) changing the elastic modulus of the honeycomb interlayer by changing the material of the honeycomb interlayer;

[0192] c) Modify the height of the honeycomb sandwich;

[0193] d) Modify the wall thickness of the honeycomb sandwich;

[0194] e) Modify the thickness of the upper and / or lower plates.

[0195] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A method for designing parameters of a stainless steel floating plate with a filling structure, wherein the stainless steel floating plate with a filling structure comprises an upper plate and a lower plate, and a honeycomb interlayer is bonded between the upper plate and the lower plate; characterized in that: The design method comprises: S1. Obtain target conditions of a stainless steel floating plate with a filling structure, and design a solid floating plate according to the target conditions; the parameters of the solid floating plate include elastic modulus, thickness, stress and deformation of the solid floating plate; S2. Calculate the cross-sectional moment of inertia of the solid floating disk according to the thickness of the solid floating disk and on the premise that the width remains unchanged; S3. Under the same width, the infill structure stainless steel floating plate is designed based on the section inertia moment of the solid floating plate, and the section inertia moment of the infill structure stainless steel floating plate is calculated; S4. Calculate the overall elastic modulus of the stainless steel floating plate with a filling structure: use simulation and three-point bending test to obtain the overall elastic modulus of the stainless steel floating plate with a filling structure through loading force and deformation; S5. Compare the overall elastic modulus of the stainless steel floating plate with the filling structure with the elastic modulus of the solid floating plate. Based on the inversely proportional relationship between the elastic modulus and the deformation, obtain the deformation of the stainless steel floating plate with the filling structure through the deformation of the solid floating plate. S6. If the deformation of the stainless steel floating plate of the filling structure meets the requirements, the design is completed. If the deformation of the stainless steel floating plate of the filling structure does not meet the requirements, execute S7. S7. First, modify the parameters of the stainless steel floating plate of the filling structure, and then calculate the stress and deformation of the stainless steel floating plate of the filling structure until the stress and deformation of the stainless steel floating plate of the filling structure meet the design requirements; the modification of the parameters of the stainless steel floating plate of the filling structure includes at least one of the following a)-e): a) modifying the material of the upper plate and / or the lower plate to thereby change the elastic modulus of the upper plate and / or the lower plate; b) changing the elastic modulus of the honeycomb interlayer by changing the material of the honeycomb interlayer; c) Modify the height of the honeycomb sandwich; d) Modify the wall thickness of the honeycomb sandwich; e) Modify the thickness of the upper and / or lower plates.

2. The design method of the parameters of the stainless steel floating plate of the filling structure according to claim 1 is characterized in that: The target conditions include that any position on the floating top of the filling structure stainless steel floating plate can withstand 0.1m 2 The concentrated live load within the range is not less than 2.2kN.

3. The design method of the parameters of the stainless steel floating plate of the filling structure according to claim 1 is characterized in that: In S1, deformation includes flexural deformation. When the solid floating plate undergoes flexural deformation, the calculation formulas for stress and deflection are as follows: Where: w max is the maximum deflection of the solid floating plate, σ max is the maximum stress of the solid floating disk; u is the Poisson's ratio of the solid floating disk, q is the loading force on the solid floating disk, R is the radius of the solid floating disk, E is the elastic modulus of the solid floating disk, and t is the thickness of the solid floating disk.

4. The design method of the parameters of the stainless steel floating plate of the filling structure according to claim 3 is characterized in that: In S3, the section moment of inertia of the infill structure stainless steel floating plate is I z , the specific calculation formula is as follows: I i is the centroid principal moment of inertia of the upper plate, honeycomb sandwich section and lower plate respectively; a i are the areas of the upper plate, honeycomb sandwich section and lower plate respectively; A i It is the distance from the centroid of the upper plate, honeycomb sandwich section and lower plate to the centroid coordinate of the entire section.

5. The method for designing parameters of a stainless steel floating plate with a filling structure according to claim 4 is characterized in that: In S4, the overall elastic modulus E of the infill structure stainless steel floating plate determined by the three-point bending test is calculated as follows: Where: E is the overall elastic modulus of the stainless steel floating plate of the filling structure, F is the central loading force, w max is the maximum deflection, I z is the section moment of inertia and l is the span.

6. A design system for parameters of a stainless steel floating plate with a filling structure, wherein the stainless steel floating plate with a filling structure comprises an upper plate and a lower plate, and a honeycomb interlayer is bonded between the upper plate and the lower plate; characterized in that: The design system includes: A solid floating plate design module is used to obtain target conditions of a stainless steel floating plate with a filling structure and to design a solid floating plate according to the target conditions; the parameters of the solid floating plate include elastic modulus, thickness, stress and deformation of the material of the solid floating plate; A solid floating plate cross-sectional inertia moment calculation module is used to calculate the cross-sectional inertia moment of the solid floating plate according to the thickness of the solid floating plate and under the premise that the width remains unchanged; The module for calculating the moment of inertia of the cross section of the infilled stainless steel floating plate is used to design the infilled stainless steel floating plate based on the moment of inertia of the cross section of the solid floating plate under the same width, and calculate the moment of inertia of the cross section of the infilled stainless steel floating plate; The overall elastic modulus calculation module of the infilled structure stainless steel floating plate is used to calculate the overall elastic modulus of the infilled structure stainless steel floating plate: the overall elastic modulus of the infilled structure stainless steel floating plate is obtained by the loading force and deformation using a three-point bending test; The deformation calculation module of the filling structure stainless steel floating plate compares the overall elastic modulus of the filling structure stainless steel floating plate with the elastic modulus of the solid floating plate, wherein the overall elastic modulus of the filling structure stainless steel floating plate is smaller than the elastic modulus of the solid floating plate; based on the inversely proportional relationship between the elastic modulus and the deformation, the deformation of the filling structure stainless steel floating plate is obtained through the deformation of the solid floating plate; Design result analysis module: if the deformation of the stainless steel floating plate of the filling structure meets the requirements, the design is completed; if the deformation of the stainless steel floating plate of the filling structure does not meet the requirements, S7 is executed; The design parameter adjustment module first modifies the parameters of the stainless steel floating plate of the filling structure, and then calculates the stress and deformation of the stainless steel floating plate of the filling structure until the stress and deformation of the stainless steel floating plate of the filling structure meet the design requirements; the modification of the parameters of the stainless steel floating plate of the filling structure includes at least one of the following a)-e): a) modifying the material of the upper plate and / or the lower plate to thereby change the elastic modulus of the upper plate and / or the lower plate; b) changing the elastic modulus of the honeycomb interlayer by changing the material of the honeycomb interlayer; c) Modify the height of the honeycomb sandwich; d) Modify the wall thickness of the honeycomb sandwich; e) Modify the thickness of the upper and / or lower plates.

7. The design system of the parameters of the stainless steel floating plate of the filling structure according to claim 6 is characterized in that: The target conditions include that any position on the floating top of the filling structure stainless steel floating plate can withstand 0.1m 2 The concentrated live load within the range is not less than 2.2kN.

8. The design system of the parameters of the stainless steel floating plate of the filling structure according to claim 7 is characterized in that: In the solid floating plate design module, deformation includes flexural deformation. When the solid floating plate undergoes flexural deformation, the calculation formulas for stress and deflection are as follows: Where: w max is the maximum deflection of the solid floating plate, σ max is the maximum stress of the solid floating disk; u is the Poisson's ratio of the solid floating disk, q is the loading force on the solid floating disk, R is the radius of the solid floating disk, E is the elastic modulus of the solid floating disk, and t is the thickness of the solid floating disk.

9. The design system of the parameters of the stainless steel floating plate of the filling structure according to claim 8 is characterized in that: In the calculation module of the moment of inertia of the stainless steel floating plate section of the filling structure: The cross-sectional inertia moment of the stainless steel floating plate of the filling structure is I z , the specific calculation formula is as follows: I i is the centroid principal moment of inertia of the upper plate, honeycomb sandwich section and lower plate respectively; a i are the areas of the upper plate, honeycomb sandwich section and lower plate respectively; A i It is the distance from the centroid of the upper plate, honeycomb sandwich section and lower plate to the centroid coordinate of the entire section.

10. The design system of the parameters of the stainless steel floating plate of the filling structure according to claim 9 is characterized in that: In the calculation module of the overall elastic modulus of the stainless steel floating plate with a filling structure, the calculation formula of the overall elastic modulus E of the stainless steel floating plate with a filling structure determined by a three-point bending test is: Where: E is the overall elastic modulus of the stainless steel floating plate of the filling structure, F is the central loading force, w max is the maximum deflection, I z is the section moment of inertia and l is the span.

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