Shape and position control method, device and equipment of multi-layer heterogeneous spherical shell structure and preparation method of multi-layer heterogeneous spherical shell structure

Abstract

The invention discloses a shape and position control method, device and equipment of a multi-layer heterogeneous spherical shell structure and a preparation method, and relates to the technical field of design of the multi-layer heterogeneous spherical shell structure. The method comprises the following steps: firstly, deducing a working strain interval of each interlayer filling material based on basic parameters of the multilayer heterogeneous spherical shell, and iteratively adjusting a working stress lower limit of each interlayer filling material according to an end face closing condition by considering a load, a stress limit value in a vibration environment and a tangent modulus constraint; and the stress of the whole structure is at the lowest level while the shape and position state control of the structure in a related environment is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of multi-layer heterogeneous spherical shell structure design, and in particular relates to a multi-layer heterogeneous spherical shell structure shape and position control method, device, equipment and preparation method. BACKGROUND

[0002] Multi-layer heterogeneous spherical shell structures can balance connection reliability, material economy and space utilization, and are widely used in the fields of aerospace and transportation. However, the thermal expansion coefficients and strength stiffness of the interlayer materials are significantly different, and under complex loads such as temperature fluctuations, vibrations and centrifugal forces, problems such as interlayer relative rotation, eccentricity and end face separation are prone to occur, leading to structural functional failure.

[0003] In order to control the relative rotation, interlayer eccentricity and hemispherical shell heterogeneous structure end face separation of the related multi-layer heterogeneous spherical shell structure under temperature, vibration, centrifugal force and other loads, it is necessary to require the interlayer filling material to have customized mechanical properties. Traditional solutions rely on empirical design, such as passive deformation by reserving fixed interlayer gaps or using general soft materials for filling (such as rubber and ordinary foam), but do not consider the dynamic matching of environmental loads and material mechanical properties. The fixed gap design cannot cope with the drastic change of the gap under extreme temperature, and the stress-strain characteristics of the general material are difficult to meet the requirements of anti-rotation, anti-eccentricity and end face closure at the same time, resulting in low shape and position control precision and poor reliability of the structure under complex environment.

[0004] Therefore, there is an urgent need for a systematic design method based on the customized requirements of interlayer filling materials, which quantifies the correlation between environmental loads and material properties, realizes precise shape and position control of multi-layer heterogeneous spherical shell structures under complex force-thermal environment, and reduces the overall structural stress. SUMMARY

[0005] The present application provides a multi-layer heterogeneous spherical shell structure shape and position control method, device, equipment and preparation method to solve the above technical problems.

[0006] The present application is realized by the following technical solutions: In a first aspect, the present application provides a multi-layer heterogeneous spherical shell structure shape and position control method, comprising: determining the basic parameters of the multi-layer heterogeneous spherical shell structure; the basic parameters include the working temperature range, the size and material thermal expansion coefficient of each layer of spherical shell, and the initial compression rate of the interlayer filling material; deriving the working strain interval of the interlayer filling material based on the basic parameters ; determining the working stress lower limit of the interlayer filling material based on the working strain interval j under consideration of the vibration environment And determining the interlayer filling material under overload and vibration conditions. j Lower limit of tangent modulus ; Based on the aforementioned working strain range Lower limit of working stress and lower limit of tangent modulus Calculate the interlayer filling material j Upper limit of working stress ; Let it be located in the spherical shell i outer interlayer filling material j The stress value is the lower limit of the working stress. Located in the spherical shell i Inner interlayer filling material j- The stress value of 1 is the upper limit of the working stress. Calculate the interlayer filling material of the outer layer respectively. j Total stress value and inner interlayer filling material j- Total stress value of 1 ; If satisfied Based on the current working strain range Lower limit of working stress and lower limit of tangent modulus Obtain the stress-strain curves of the interlayer filling material; otherwise... Gradually increase the lower limit of the working stress of the outer or inner interlayer filler material until it meets the requirements. The stress-strain curves of the interlayer filling material were obtained based on the adjusted lower limit of working stress.

[0007] In the above-described method of the present invention, shape and position control design is carried out based on basic parameters, considering the strain range of the interlayer filling material under the working temperature range, and transforming environmental parameters such as load and vibration into stress limits and tangent modulus constraints to meet the end face rotation behavior suppression conditions; end face non-separation is taken as the optimization condition, that is, the total force of the outer layer of the end face is greater than or equal to the total force of the inner layer, ensuring the material performance under extreme temperatures and avoiding the failure risk of traditional fixed gap design when the temperature difference is too large; by gradually increasing the lower limit of working stress for iterative adjustment, the structural shape and position state control under relevant environments is met, while the stress on the entire structure is kept at the lowest level.

[0008] Furthermore, the interlayer filling material is derived based on the aforementioned basic parameters. Working strain range ,include: The interlayer filling material is determined based on the inner and outer diameters of each spherical shell layer. initial interlayer gap ; Based on the thermal expansion coefficient of each layer of the spherical shell and the interlayer filling material initial interlayer gap In addition to the operating temperature range, determine the interlayer filling material. The range of interlayer spacing variation; Based on interlayer filling material Initial compression ratio, initial interlayer gap And the range of interlayer gap variation, to determine the interlayer filling material. Working strain range .

[0009] Furthermore, the initial interlayer gap Represented as: ,

[0010] in, Indicates the first i The outer diameter of the spherical shell, Indicates the first i+ The inner diameter of a single spherical shell, Indicates the first j The initial interlayer gap of the interlayer filling material, the first j Interlayer filling material is located in the first j The first layer of spherical shell and the second layer of spherical shell j+ Between the two layers of the spherical shell.

[0011] Furthermore, the range of variation in the interlayer gap is expressed as follows: ,

[0012] in, , They represent the first i The first layer of spherical shell and the second layer of spherical shell i+ The coefficient of thermal expansion of the material of a single-layer spherical shell is: , They represent the first i The outer diameter of the first spherical shell and the first i+ The inner diameter of a single spherical shell, Indicates the operating temperature range. Indicates the first j The range of interlayer gap variation of the interlayer filling material, the first j Interlayer filling material is located in the first j The first layer of spherical shell and the second layer of spherical shell j+ Between the 1st and 2nd layers of spherical shell.

[0013] Furthermore, considering vibration environments, interlayer filling materials j Lower limit of working stress satisfy ; Indicates interlayer filling material considering vibration environment j The minimum stress that satisfies the condition for suppressing rotational behavior; Considering overload and vibration environments, interlayer filling materials j Lower limit of tangent modulus satisfy ; This indicates the interlayer filling material considering overload and vibration environments. j The minimum tangent modulus that satisfies the eccentricity suppression condition.

[0014] Furthermore, the interlayer filling material j Upper limit of working stress satisfy:

[0015] in, Indicates interlayer filling material j Lower limit of working stress , Indicates interlayer filling material Working strain range The upper limit of strain, Indicates interlayer filling material Working strain range The lower limit of strain, This indicates the lower limit of the tangent modulus.

[0016] Furthermore, the outer interlayer filling material j Total stress value The calculation is as follows:

[0017] in, Indicates the first j Lower limit of working stress for interlayer filler materials Indicates the first case when the gap is fully filled. j The normal projected area of ​​the interlayer filling material, the first j Interlayer filling material is located in the first j The outer side of the spherical shell; Inner interlayer filling material j- Total stress value of 1 The calculation is as follows:

[0018] in, Indicates the first j- Upper limit of working stress for interlayer filler material. Indicates the first case when the gap is fully filled. j-The normal projected area of ​​the interlayer filler material, the first j- The first interlayer filler material is located in the first layer. j The inner side of the spherical shell.

[0019] A second aspect of the present invention provides a form and position control device for a multilayer heterogeneous spherical shell structure, comprising: The parameter setting module is used to determine the basic parameters of the multi-layer heterogeneous spherical shell structure; the basic parameters include the operating temperature range, the size and thermal expansion coefficient of each spherical shell layer, and the initial compressibility of the interlayer filling material. The first calculation module is used to derive the interlayer filling material based on the basic parameters. Working strain range ; The second calculation module is used to calculate based on the working strain range. Determining the interlayer filling material under vibration conditions j Lower limit of working stress And determining the interlayer filling material under overload and vibration conditions. j Lower limit of tangent modulus ; The third calculation module, based on the working strain range Lower limit of working stress and lower limit of tangent modulus Calculate the interlayer filling material j Upper limit of working stress ; The fourth calculation module is used to calculate the value of the material located on the spherical shell. i outer interlayer filling material j The stress value is the lower limit of the working stress. Located in the spherical shell i Inner interlayer filling material j- The stress value of 1 is the upper limit of the working stress. Calculate the interlayer filling material of the outer layer respectively. j Total stress value and inner interlayer filling material j- Total stress value of 1 ; The form and position control module is used to determine whether the requirements are met. If satisfied, then based on the current working strain range Lower limit of working stress and lower limit of tangent modulus Obtain the stress-strain curves of the interlayer filling material; otherwise... Gradually increase the lower limit of the working stress of the outer or inner interlayer filler material until it meets the requirements. , and a stress-strain curve of the interlayer filling material in the multilayer heterogeneous spherical shell structure is obtained based on the adjusted lower limit of the working stress.

[0020] In a third aspect, the application provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the multilayer heterogeneous spherical shell structure shape and position control method according to any one of the first aspect.

[0021] In a fourth aspect, the application provides a multilayer heterogeneous spherical shell structure preparation method based on shape and position control, comprising: The stress-strain curve of the interlayer filling material in the multilayer heterogeneous spherical shell structure is obtained based on the multilayer heterogeneous spherical shell structure shape and position control method according to any one of claims 1-7. According to the basic parameters of the multilayer heterogeneous spherical shell structure and the stress-strain curve of the interlayer filling material, and combined with foaming technology or 3D printing technology, an interlayer filling material meeting the mechanical performance design requirements is prepared. According to the initial compression rate of the interlayer filling material, the interlayer filling material is assembled to obtain the multilayer heterogeneous spherical shell structure with shape and position state control.

[0022] Compared with the prior art, the application has the following advantages and beneficial effects: Based on the structure basic parameters and the working temperature range, the working strain range of the interlayer filling material is derived, and combined with the quantitative constraints of stress and tangent modulus, the relative position of the multilayer spherical shell is accurately controlled under complex environment, and the problems of layer rotation and eccentricity are effectively inhibited; For temperature fluctuations, vibration and other extreme working conditions, a dynamic balance condition of the total force of the outer layer being greater than the total force of the inner layer is designed to ensure that the end face is always closed, and it is suitable for harsh environments such as aerospace; By iteratively adjusting the stress lower limit, the overall stress is minimized while meeting all constraint conditions, reducing material fatigue loss and improving structural reliability and durability; The stress-strain curve is used to determine the material performance parameters, guide the preparation of special filling materials by foaming or 3D printing technology, and avoid the performance redundancy or deficiency of traditional general materials. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor. In the drawings: Figure 1 It is a schematic diagram of a multilayer heterogeneous spherical shell structure. Figure 2 is a flow chart of a shape and position control method of a multi-layer heterogeneous spherical shell structure; Figure 3 is a flow chart of a method for deriving a working strain range of an interlayer filling material; Figure 4 is a schematic diagram of a design flow of a three-layer spherical shell structure. DETAILED DESCRIPTION

[0024] In order to make the objectives, technical solutions and advantages of the present application clearer, further detailed description will be made to the present application with reference to the embodiments and drawings, and the schematic embodiments of the present application and the description thereof are only used for explaining the present application and not as a limitation to the present application.

[0025] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units does not have to be limited to or inherent to other steps or units.

[0026] The terms used in various embodiments of the present application are only used for the purpose of describing specific embodiments and are not intended to limit various embodiments of the present application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly dictates otherwise. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present application belong. The terms (such as those defined in a generally used dictionary) will be interpreted to have the same meaning as the contextual meaning in the relevant technical field and will not be interpreted to have an idealized or overly formal meaning, unless clearly defined in various embodiments of the present application.

[0027] The present application aims to provide a shape and position control method of a multi-layer heterogeneous spherical shell structure based on the customization needs of an interlayer filling material in a complex force-thermal environment, to meet the shape and position state control of the multi-layer heterogeneous spherical shell structure in the relevant environment, while keeping the overall structure stress at a minimum level.

[0028] Multilayer heterogeneous spherical shell structures typically refer to composite structures composed of two or more nested spherical shells made of different materials. The material properties of each shell layer differ, and gaps are left between layers, filled with specific materials to achieve connection, buffering, or positional control functions. Referring to Figure 1, the structure comprises 1 to 4 layers of spherical shells from the inside out. Each shell is hollow, with the inner diameter of the outer shell slightly larger than the outer diameter of the inner shell, creating annular gaps between adjacent shell layers (such as the gap between the first and second shell layers, or the gap between the second and third shell layers). The filling materials in these gaps are customized according to the differences in thermal expansion and stress requirements of each layer, thereby constraining the relative movement of the shell layers under conditions such as temperature changes and vibrations, ensuring the positional stability of the overall structure.

[0029] See Figure 2 As shown, the shape and position control method for multilayer heterogeneous spherical shell structures proposed in this invention includes the following steps.

[0030] S1, determine the basic parameters of the multilayer heterogeneous spherical shell structure.

[0031] First, design the basic parameters of the multi-layer heterogeneous spherical shell structure based on the basic requirements, such as the number of shell layers, radius, materials used, operating temperature range of the structure, dimensions of each shell layer (inner diameter, outer diameter, thickness), material properties (such as the coefficient of thermal expansion of the material), and initial compression ratio of the filling material between each layer.

[0032] S2, based on the basic parameters, derives the working strain range of the interlayer filling material.

[0033] Taking a four-layer heterogeneous spherical shell structure as an example, the shell layers are arranged from the inside out as layer 1 to layer 4. The interlayer filling material between each shell layer is arranged from the inside out as layer 1 to layer 4. Interlayer filling material indicates the location of the first layer. The first layer of spherical shell and the second layer of spherical shell +1 layer of filling material between the spherical shells , This represents the number of spherical shells. Then, for the th... Interlayer filling material, according to adjacent layers j Layers and The basic parameters of the +1 layer heterogeneous spherical shell can be used to calculate the initial size of the interlayer gap, the range of gap variation within the operating temperature range, and other basic data on the interlayer gap. Furthermore, the first layer can be calculated. Working strain range of interlayer filler material within the working temperature range , , To be the lower limit of strain, This represents the upper limit of strain.

[0034] S3, based on the working strain range of each interlayer filling material, determines the lower limit of the working stress of each interlayer filling material under vibration environment, and determines the lower limit of the tangent modulus of each interlayer filling material under overload and vibration environment.

[0035] For the Working strain range of interlayer filler material The upper and lower strain limits can be used to calculate the corresponding upper and lower stress limits. Simultaneously, considering the suppression conditions for rotational behavior of each layer under vibration conditions, i.e., requiring that the lower stress limit of each layer must be greater than a certain limit, the lower stress limit of the interlayer filling material in the multilayer heterogeneous structure at the lower strain limit should satisfy the following:

[0036] in, Indicates the first j Lower limit of working stress for interlayer filler materials Indicating the first under vibration conditions j The minimum stress value of the interlayer filling material that satisfies the condition for inhibiting rotational behavior.

[0037] To effectively suppress interlayer eccentricity under overload and vibration conditions, the tangent modulus of each layer of filling material must be greater than a certain limit. Therefore, the tangent modulus of the interlayer filling material in a multilayer heterogeneous structure should satisfy the following conditions during the strain working range:

[0038] in, Indicates the first j Lower limit of tangential modulus of interlayer filler material This indicates that the first [condition] is considered under overload and vibration conditions. j The minimum tangential modulus of the interlayer filling material that satisfies the eccentricity suppression condition.

[0039] S4. Based on the working strain range, lower limit of working stress, and lower limit of tangent modulus of each interlayer filling material, calculate the upper limit of working stress of each interlayer filling material.

[0040] For the Interlayer filler material, combined with the interlayer filler material determined in step S2. strain working range Step S3 determines the starting point of the strain range. stress lower limit and the tangent modulus value in the strain range Then the endpoint of the interval can be determined. That is, the stress value at the upper limit of strain satisfies the following condition:

[0041] in, Indicates interlayer filling material j Lower limit of working stress , Indicates interlayer filling material Working strain range The upper limit of strain, Indicates interlayer filling material Working strain range The lower limit of strain, This indicates the lower limit of the tangent modulus.

[0042] S5, based on the working stress range of the interlayer filling material, determine whether the end face closure condition is met at each layer of the spherical shell.

[0043] Considering that the end faces of each layer of parts are always in an effective closed state under temperature change environment, it is required that when the outer layer gap is at the lowest strain value and the inner layer gap is at the highest strain value, the total force of the outer layer filling material is greater than the total force of the inner layer filling material.

[0044] Specifically, let the spherical shell i outer interlayer filling material j ( The stress value is the lower limit of the working stress. Located in the spherical shell i Inner interlayer filling material j- The stress value of 1 is the upper limit of the working stress. Calculate the interlayer filling material of the outer layer respectively. j Total stress value and inner interlayer filling material j- Total stress value of 1 Determine if the condition is met. .

[0045] S6, by adjusting the interlayer filling material in step S3 j The lower limit of working stress is determined so that each layer of the spherical shell satisfies the end-face closure condition, and the minimum lower limit of working stress under the satisfied condition is obtained, thereby obtaining the stress-strain curve of the interlayer filling material.

[0046] Considering that the end faces of each layer of parts are always in an effective closed state under temperature change environment, it is necessary to revise the total stress value of the interlayer filling material of the multilayer heterogeneous structure in conjunction with S3~S5. When revising the lower limit of working stress, the rotation behavior suppression condition under vibration environment should also be considered to simultaneously meet the end face fastening and anti-rotation conditions.

[0047] If the current working strain range, lower limit of working stress, and lower limit of tangent modulus of the interlayer filling material of the inner and outer sides meet the following conditions: Based on the current working strain range Lower limit of working stress and lower limit of tangent modulus Obtain the stress-strain curves of each interlayer filling material; otherwise, return to step S3 to gradually increase the lower limit of the working stress of the outer interlayer filling material and update the corresponding parameters until the requirements are met. The stress-strain curves of the interlayer filling material were obtained based on the adjusted lower limit of working stress.

[0048] Further, see Figure 3 As shown, step S2 derives the working strain range of the interlayer filling material based on the basic parameters, specifically including the following calculation steps.

[0049] S2-1, Determine the interlayer filling material based on the inner and outer diameters of each spherical shell layer. initial interlayer gap .

[0050] For example, the inner diameter of the first layer of the spherical shell is The outer diameter is , No. i The inner diameter of the spherical shell is expressed as The outer diameter is expressed as Then the initial interlayer gap corresponding to the first layer of interlayer filler material is , No. j The initial interlayer gap is expressed as:

[0051] in, Indicates the first i The outer diameter of the spherical shell, Indicates the first i+ The inner diameter of the first spherical shell, the first j Interlayer filling material is located in the first j The first layer of spherical shell and the second layer of spherical shell j+ Between the 1st and 2nd layers of the spherical shell, .

[0052] S2-2, based on the thermal expansion coefficient of each layer of the spherical shell and the interlayer filling material initial interlayer gap In addition to the operating temperature range, determine the interlayer filling material. The range of variation in interlayer gaps.

[0053] For example, the coefficient of thermal expansion of the first spherical shell is... , No. i The inner diameter of the layered spherical shell is The operating temperature range is expressed as The range of variation in the interlayer gap of the first layer is: , No. The range of variation in interlayer spacing is as follows:

[0054] in, , They represent the first i The thermal expansion coefficient of the material of the spherical shell and the first i+ The coefficient of thermal expansion of the material of a single-layer spherical shell is: , They represent the first i The outer diameter of the first spherical shell and the first i+ The inner diameter of a single spherical shell, Indicates the operating temperature range. Indicates the first j The range of interlayer gap variation of the interlayer filling material, the first j Interlayer filling material is located in the first j The first layer of spherical shell and the second layer of spherical shell j+ Between the 1st and 2nd layers of the spherical shell, .

[0055] S2-3, based on interlayer filling material Initial compression ratio, initial interlayer gap And the range of interlayer gap variation, to determine the interlayer filling material. Working strain range .

[0056] Based on the initial interlayer filler material compression amount Considering the change in interlayer gaps under varying temperature conditions, the strain operating range of each layer's filling material is determined. For the first... j The layer, whose working scope is:

[0057] in, Indicates interlayer filling material Working strain range The upper limit of strain, Indicates interlayer filling material Working strain range The lower limit of strain.

[0058] Furthermore, in S5, the total stress can be calculated by combining the stress of the interlayer filling material with the normal projected area. The calculation formula is as follows:

[0059] in, Indicates the first j Lower limit of working stress for interlayer filler materials Indicates the first case when the gap is fully filled. j The normal projected area of ​​the interlayer filling material, the firstj Interlayer filling material is located in the first j The outer side of the multilayered spherical shell. Based on the basic parameters of the spherical shell, the normal projected area of ​​the filling material in each layer of the multilayered heterogeneous structure can be determined.

[0060] Then the first j The end-face closure condition of a layered spherical shell is expressed as:

[0061] in, , indicating the first j The total stress of the interlayer filling material on the inner side of the spherical shell. Indicates the first j- Upper limit of working stress for interlayer filler material. Indicates the first case when the gap is fully filled. j- The normal projected area of ​​the interlayer filler material. Indicates the first j The total stress of the interlayer filling material on the outer side of the spherical shell.

[0062] See Figure 4 As shown, the above method of the present invention will be further explained below using a three-layer spherical shell structure of 1Cr13 steel-polyurethane foam-TU1 copper as an example of shape and position control.

[0063] Step 1: Determine the initial design parameters.

[0064] The inner and outer surface radii of 1Cr13 steel are determined to be 20mm / 25mm, the inner and outer surface radii of polyurethane foam are 26mm / 36mm, and the inner and outer surface radii of TU1 copper are 37mm / 50mm. The coefficients of thermal expansion of 1Cr13 steel, polyurethane foam, and TU1 copper are respectively... , , .

[0065] Step 2: Determine the normal projected area of ​​the filling material in each layer of the multilayer heterogeneous structure.

[0066] The filler material is set to completely fill the gaps between 1Cr13 steel and polyurethane foam, and between polyurethane foam and TU1 copper, meaning the projected area of ​​the first filler layer is 1963. The projected area of ​​the second filling layer is 4071. .

[0067] Step 3: Determine the initial interlayer gap of the multilayer heterogeneous structure and the range of variation of the interlayer gap under the temperature range.

[0068] The initial interlayer gap of the first layer is 1 mm, and the initial interlayer gap of the second layer is 1 mm. Considering the temperature variation range of ±40 K relative to room temperature, the interlayer gap variation range of the first layer is 0.959 mm to 1.041 mm, and the interlayer gap variation range of the second layer is 0.953 mm to 1.047 mm.

[0069] Step 4: Determine the strain working range of the interlayer filling material in the multilayer heterogeneous structure.

[0070] With an initial interlayer filler compression of 20%, and considering the change in interlayer gap under temperature variations, the working range of each layer of filler is determined. The working range of the first layer of filler is 16.7%~23.3%, and the working range of the second layer of filler is 16.2%~23.8%.

[0071] Step 5: Consider the conditions for suppressing the rotational behavior of each layer under vibration environment.

[0072] To meet the requirements for suppressing rotational behavior, the lower limit of stress in each layer must be greater than a certain limit. That is, the lower limit of stress at the strain lower limit of the interlayer filling material of the multilayer heterogeneous structure must be determined. Based on engineering experience, the stress of the first and second layers of filling material must be >0.20MPa.

[0073] Step 6: Consider effective suppression of interlayer eccentricity under overload and vibration environments.

[0074] To meet the requirements for eccentricity suppression, the tangent modulus of each layer of filling material must be greater than a certain limit. That is, the tangent modulus of the interlayer filling material in the multilayer heterogeneous structure is determined in the strain working range. Based on engineering experience and numerical analysis results, the tangent modulus of the first layer of filling material needs to be >1.50MPa and the tangent modulus of the second layer of filling material needs to be >2.80MPa.

[0075] Step 7: Determine the stress limit of each interlayer filler material at the upper limit of strain operation.

[0076] Combining step 4 which determined the strain working range of the filling material, step 5 which determined the stress limit at the starting point of the range, and step 6 which determined the tangent modulus value of the strain range, the stress value at the end point of the range, i.e., the upper limit of strain, is determined to meet the following conditions, while also considering optimal stress distribution, i.e., minimizing the values ​​of each component: the first layer of filling material needs to meet the stress conditions (strain 16.7%, stress 0.20MPa; strain 23.3%, stress 0.299MPa), and the second layer of filling material needs to meet the stress conditions (strain 16.2%, stress 0.20MPa; strain 23.8%, stress 0.413MPa).

[0077] Step 8: Consider the end face closure conditions of each layer of parts under temperature change conditions.

[0078] In this implementation case, the spherical shell that needs to be considered for end-face closure is a polyurethane layer. To ensure that the end face is always in an effective closed state, it is required that, under low temperature conditions, the outer layer filling material of the polyurethane layer is at its lowest strain value and the inner layer filling material is at its highest strain value, that is, the total force of the outer layer filling material is greater than the total force of the inner layer filling material.

[0079] Considering the difference in the area of ​​the filling material, the ratio of the stress of the second layer of filling material at a strain of 16.2% to the stress of the first layer of filling material at a strain of 23.3% needs to be greater than 1963 / 4071 = 0.48. Through the stress conditions of the first layer of filling material (strain 23.3%, stress 0.299MPa) and the stress conditions of the second layer of filling material (strain 16.2%, stress 0.20MPa) given in step 7, it can be found that the ratio is 0.67 > 0.48. Therefore, the stress conditions given in step 7 meet the requirements of step 8.

[0080] Step 9: Since the conditions in Step 8 can be directly satisfied by the results in Step 7, there is no need to modify Step 9 in this case. If the results in Step 7 do not meet the requirements of Step 8 in other cases, it is necessary to return to Steps 5-8 for correction. Finally, the stress-strain curves of the interlayer filling material obtained from Steps 1-8 are obtained.

[0081] Finally, based on the stress-strain curve of the interlayer filler material, and combining methods such as foaming and 3D printing, an interlayer filler material that meets the mechanical performance requirements can be developed. Specifically, the first layer filler material needs to meet the stress conditions (strain 16.7%, stress 0.20 MPa; strain 23.3%, stress 0.299 MPa), and the second layer filler material needs to meet the stress conditions (strain 16.2%, stress 0.20 MPa; strain 23.8%, stress 0.413 MPa). By assembling the multilayer heterogeneous structure according to the initial compression ratio required in step 4, as specified in steps 1 and 2, the corresponding form and position control function can be achieved.

[0082] Embodiments of the present invention also provide a method for preparing a multilayer heterogeneous spherical shell structure based on shape and position control, comprising the following steps: S3-1, The stress-strain curves of the interlayer filling material in the multilayer heterogeneous spherical shell structure are obtained based on the form and position control method of the multilayer heterogeneous spherical shell structure. S3-2, based on the basic parameters of the multi-layer heterogeneous spherical shell structure and the stress-strain curves of the interlayer filling materials, the interlayer filling materials that meet the mechanical performance design requirements are produced by combining foaming technology or 3D printing technology. S3-3, Assemble the interlayer filling materials according to the initial compression ratio of each interlayer filling material to obtain the multilayer heterogeneous spherical shell structure with shape and position control.

[0083] For the first layer of filler material (strain 16.7%~23.3%, stress 0.20MPa~0.299MPa, tangent modulus ≥1.50MPa), a polyurethane foaming process can be used: by adjusting the ratio of isocyanate to polyol (e.g. 1:1.2) and adding 0.5% glass microspheres (50μm in diameter) to control the porosity (about 20%), the material can meet the stress and modulus requirements within the target strain range.

[0084] For the second layer of filler material (strain 16.2%~23.8%, stress 0.20MPa~0.413MPa, tangent modulus ≥2.80MPa), photopolymerization 3D printing can be used: select an elastic resin (such as Shore A 80), and by controlling the layer thickness (50μm), curing power (30mW) and scanning speed (500mm / s), form an internal structure with gradually varying lattice density (porosity 15%), so that the material exhibits the target stress-strain characteristics during compression.

[0085] Embodiments of the present invention also provide a form and position control device for a multilayer heterogeneous spherical shell structure, comprising: The parameter setting module is used to determine the basic parameters of the multi-layer heterogeneous spherical shell structure; the basic parameters include the operating temperature range, the size and thermal expansion coefficient of each spherical shell layer, and the initial compressibility of the interlayer filling material. The first calculation module is used to derive the interlayer filling material based on the basic parameters. Working strain range ; The second calculation module is used to calculate based on the working strain range. Determining the interlayer filling material under vibration conditions j Lower limit of working stress And determining the interlayer filling material under overload and vibration conditions. j Lower limit of tangent modulus ; The third calculation module, based on the working strain range Lower limit of working stress and lower limit of tangent modulus Calculate the interlayer filling material j Upper limit of working stress ; The fourth calculation module is used to calculate the value of the material located on the spherical shell. i outer interlayer filling material j The stress value is the lower limit of the working stress. Located in the spherical shell i Inner interlayer filling material j- The stress value of 1 is the upper limit of the working stress. Calculate the interlayer filling material of the outer layer respectively. j Total stress value and inner interlayer filling material j- Total stress value of 1 ; The form and position control module is used to determine whether the requirements are met. If satisfied, then based on the current working strain range Lower limit of working stress and lower limit of tangent modulus Obtain the stress-strain curves of the interlayer filling material; otherwise... Gradually increase the lower limit of the working stress of the outer interlayer filling material until it meets the requirements. The stress-strain curves of the interlayer filling material were obtained based on the adjusted lower limit of working stress.

[0086] Each functional module in the above device corresponds to a step in the form and position control method for a multi-layer heterogeneous spherical shell structure. Therefore, the specific implementation method is described in the aforementioned embodiment.

[0087] Embodiments of the present invention also provide an electronic device including a processor and a memory, wherein the number of processors may be one or more. The memory, as a computer-readable storage medium, can be used to store software programs, computer-executable programs, and modules. The processor executes various functional applications and data processing of the electronic device by running the software programs, instructions, and modules stored in the memory, thereby realizing the form and position control method for the multilayer heterogeneous spherical shell structure of any of the above embodiments of the present invention.

[0088] The memory may primarily comprise a program storage area and a data storage area. The program storage area may store the operating system and at least one application program required for a given function; the data storage area may store data created based on terminal usage. Furthermore, the memory may include high-speed random access memory (RAM) and non-volatile memory, such as at least one disk storage device, flash memory, or other non-volatile solid-state storage device. In some instances, the memory may further include memory remotely located relative to the processor, which can be connected to the electronic device via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks (LANs), mobile communication networks, and combinations thereof.

[0089] Embodiments of the present invention also provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the form and position control method for a multilayer heterogeneous spherical shell structure according to any embodiment of the present invention.

[0090] The computer storage medium of this invention can be any combination of one or more computer-readable media. A computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of computer-readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this invention, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0091] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, capable of sending, propagating, or transmitting programs for use by or in connection with an instruction execution system, apparatus, or device.

[0092] Embodiments of the present invention also provide a computer program product that, when run on a computer, causes the computer to execute the form and position control method for a multilayer heterogeneous spherical shell structure according to any of the above embodiments of the present invention.

[0093] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for shape and position control of a multilayer heterogeneous spherical shell structure, characterized in that, include: Determine the basic parameters of the multi-layer heterogeneous spherical shell structure; the basic parameters include the operating temperature range, the size and thermal expansion coefficient of each spherical shell layer, and the initial compressibility of the interlayer filling material. Based on the aforementioned basic parameters, the interlayer filling material is derived. Working strain range ; Based on the working strain range Determining the interlayer filling material under vibration conditions Lower limit of working stress And determining the interlayer filling material under overload and vibration conditions. Lower limit of tangent modulus ; Based on the working strain range Lower limit of working stress and lower limit of tangent modulus Calculate the interlayer filling material Upper limit of working stress ; Let it be located in the spherical shell outer interlayer filling material The stress value is the lower limit of the working stress. Located in the spherical shell Inner interlayer filling material - The stress value of 1 is the upper limit of the working stress. Calculate the interlayer filling material of the outer layer respectively. Total stress value and inner interlayer filling material - Total stress value of 1 ; If satisfied Based on the current working strain range Lower limit of working stress and lower limit of tangent modulus Obtain the stress-strain curves of the interlayer filling material; otherwise... Gradually increase the lower limit of the working stress of the outer interlayer filling material until it meets the requirements. The stress-strain curves of the interlayer filling material were obtained based on the adjusted lower limit of working stress.

2. The method for shape and position control of a multi-layered heterogeneous spherical shell structure according to claim 1, characterized in that, Based on the aforementioned basic parameters, the interlayer filling material is derived. Working strain range ,include: The interlayer filling material is determined based on the inner and outer diameters of each spherical shell layer. initial interlayer gap ; Based on the thermal expansion coefficient of each layer of the spherical shell and the interlayer filling material initial interlayer gap In addition to the operating temperature range, determine the interlayer filling material. The range of interlayer spacing variation; Based on interlayer filling material Initial compression ratio, initial interlayer gap And the range of interlayer gap variation, to determine the interlayer filling material. Working strain range .

3. The method for shape and position control of a multi-layered heterogeneous spherical shell structure according to claim 2, characterized in that, The initial interlayer gap Represented as: ， in, Indicates the first i The outer diameter of the spherical shell, Indicates the first i+ The inner diameter of a single spherical shell, Indicates the first j The initial interlayer gap of the interlayer filling material, the first j Interlayer filling material is located in the first j The first layer of spherical shell and the second layer of spherical shell j+ Between the 1st and 2nd layers of spherical shell.

4. The method for shape and position control of a multi-layered heterogeneous spherical shell structure according to claim 2, characterized in that, The range of interlayer gap variation is expressed as follows: ， in, , They represent the first i The first layer of spherical shell and the second layer of spherical shell i+ The coefficient of thermal expansion of the material of a single-layer spherical shell is: , They represent the first i The outer diameter of the first spherical shell and the first i+ The inner diameter of a single spherical shell, Indicates the operating temperature range. Indicates the first j The range of interlayer gap variation of the interlayer filling material, the first j Interlayer filling material is located in the first j The first layer of spherical shell and the second layer of spherical shell j+ Between the 1st and 2nd layers of spherical shell.

5. The method for shape and position control of a multilayer heterogeneous spherical shell structure according to claim 1, characterized in that, Considering vibration environments, interlayer filling materials j Lower limit of working stress satisfy ; Indicates interlayer filling material considering vibration environment j The minimum stress that satisfies the condition for suppressing rotational behavior; Considering overload and vibration environments, interlayer filling materials j Lower limit of tangent modulus satisfy ; This indicates the interlayer filling material considering overload and vibration environments. j The minimum tangent modulus that satisfies the eccentricity suppression condition.

6. The method for shape and position control of a multi-layered heterogeneous spherical shell structure according to claim 1, characterized in that, The interlayer filling material j Upper limit of working stress satisfy: in, Indicates interlayer filling material Lower limit of working stress , Indicates interlayer filling material Working strain range The upper limit of strain, Indicates interlayer filling material Working strain range The lower limit of strain, This indicates the lower limit of the tangent modulus.

7. The method for shape and position control of a multi-layered heterogeneous spherical shell structure according to claim 1, characterized in that, outer interlayer filling material Total stress value The calculation is as follows: in, Indicates the first Lower limit of working stress for interlayer filler materials Indicates the first case when the gap is fully filled. The normal projected area of ​​the interlayer filling material, the first Interlayer filling material is located in the first The outer side of the spherical shell; Inner interlayer filling material - Total stress value of 1 The calculation is as follows: in, Indicates the first - The upper limit of working stress for interlayer filler material. Indicates the first case when the gap is fully filled. - The normal projected area of ​​the interlayer filler material, the first - The first interlayer filler material is located in the first layer. The inner side of the spherical shell.

8. A form and position control device for a multi-layered heterogeneous spherical shell structure, characterized in that, include: The parameter setting module is used to determine the basic parameters of the multi-layer heterogeneous spherical shell structure; the basic parameters include the operating temperature range, the size and thermal expansion coefficient of each spherical shell layer, and the initial compressibility of the interlayer filling material. The first calculation module is used to derive the interlayer filling material based on the basic parameters. Working strain range ; The second calculation module is used to calculate based on the working strain range. Determining the interlayer filling material under vibration conditions Lower limit of working stress And determining the interlayer filling material under overload and vibration conditions. Lower limit of tangent modulus ; The third calculation module, based on the working strain range Lower limit of working stress and lower limit of tangent modulus Calculate the interlayer filling material Upper limit of working stress ; The fourth calculation module is used to calculate the value of the material located on the spherical shell. outer interlayer filling material The stress value is the lower limit of the working stress. Located in the spherical shell Inner interlayer filling material - The stress value of 1 is the upper limit of the working stress. Calculate the interlayer filling material of the outer layer respectively. Total stress value and inner interlayer filling material - Total stress value of 1 ; The form and position control module is used to determine whether the requirements are met. If satisfied, then based on the current working strain range Lower limit of working stress and lower limit of tangent modulus Obtain the stress-strain curves of the interlayer filling material; otherwise... Gradually increase the lower limit of the working stress of the outer interlayer filling material until it meets the requirements. The stress-strain curves of the interlayer filling material were obtained based on the adjusted lower limit of working stress.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the shape and position control method for the multilayer heterogeneous spherical shell structure according to any one of claims 1-7.

10. A method for fabricating a multilayer heterogeneous spherical shell structure based on shape and position control, characterized in that, include: The stress-strain curves of the interlayer filling material in the multilayer heterogeneous spherical shell structure are obtained based on the form and position control method of the multilayer heterogeneous spherical shell structure according to any one of claims 1-7. Based on the basic parameters of the multilayer heterogeneous spherical shell structure and the stress-strain curves of the interlayer filling materials, interlayer filling materials that meet the mechanical performance design requirements are produced by combining foaming technology or 3D printing technology. By assembling the interlayer filling materials according to their initial compression ratios, the multilayer heterogeneous spherical shell structure with shape and position control is obtained.

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