Composite material honeycomb sandwich antenna panel parametric modeling system

Abstract

The invention provides a composite material honeycomb sandwich antenna panel parameterized modeling system, which is characterized in that a graphic interactive interface is established based on an App designer module of MATLAB, a geometric information generation program of a honeycomb sandwich antenna panel is taken as a core, and the geometric information of a honeycomb corrugated plate, composite material attributes, antenna panel part layering information and other variables are input, so that the geometric information of the honeycomb sandwich antenna panel is generated. And obtaining output objects such as a honeycomb corrugated plate interlayer antenna panel entity model and a corresponding finite element simulation model. According to the method, a scheme can be designed by a user, the composite material honeycomb sandwich antenna panel model can be quickly constructed according to the geometric parameters and the material attributes, and the influence degree of the change of the honeycomb sandwich geometric parameters and the panel material on the to-be-researched performance of the antenna panel can be researched; and a convenient modeling platform is provided for optimization of a subsequent panel structure.

Description

Technical Field

[0001] The invention belongs to the field of astronomical technology and methods, and in particular relates to a parametric modeling system for a composite material honeycomb sandwich antenna panel. Background Art

[0002] In recent years, in the field of astronomical research, in order to explore the formation and evolution of stars in the universe and the composition of the universe, the development of modern single-aperture antenna technology in the submillimeter wave and terahertz frequency bands has become a hot direction for the key technology of current radio telescopes. In order to achieve high reception efficiency of submillimeter wave and terahertz frequency band information and avoid the interference of water vapor and oxygen on the radio high-frequency band, the site of this type of radio telescope is usually selected in areas such as high altitude and high latitude. However, the above-mentioned areas are affected by extreme environments, such as low temperature and large temperature fluctuations. Long-term exposure to such extreme environments will cause uneven deformation distribution inside the structure, deteriorating the surface accuracy of the antenna panel (that is, the residual of the comparison between the actual surface profile and the theoretical design surface profile), resulting in reduced signal reception efficiency or even failure to achieve the preset goals.

[0003] The national key scientific research infrastructure "5-m Dome A TerahertzExplorer" (DATE5) is taken as the research object. For the main reflector of the antenna of this type of radio telescope that observes the terahertz band, its root mean square (rms) surface accuracy needs to be controlled within 10μm to ensure the observation efficiency. Therefore, it is studied whether the surface accuracy of the reflector panel in a low-temperature environment meets the preset requirements, and further studies the influence of the panel sandwich structure on the panel surface accuracy, so as to provide a design plan for the subsequent panel structure optimization design, so as to achieve the ultimate goal of building a radio telescope that observes the terahertz band. Summary of the invention

[0004] The present invention aims to solve the problems of large modeling workload, long discrete antenna panel modeling time, and cumbersome steps for setting material information in the simulation environment in the prior art method of changing the geometric characteristic length of the sandwich to change the sandwich antenna panel structure. A composite honeycomb sandwich antenna panel parametric modeling system is provided. In the process of modeling and discretization, only the necessary parameters for modeling and simulation need to be input to realize parametric construction of solid models and finite element simulation models, thereby improving the efficiency of studying the prediction of panel sandwich structure performance.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a parametric modeling system for a composite honeycomb sandwich antenna panel, comprising:

[0007] The module for determining the file storage address is used to select the address for file storage and determine the saving path of the model file after export;

[0008] A characteristic parameter setting module is used to create antenna panel geometry information according to the input characteristic length information of the honeycomb sandwich;

[0009] A material parameter setting module is used to set the property information of the composite material and the ply information of the antenna panel structure;

[0010] The file export module is used to construct and output a honeycomb sandwich antenna panel solid model according to the antenna panel geometric information, and to construct and output a honeycomb sandwich antenna panel finite element simulation model according to the antenna panel geometric information, the property information of the composite material and the layup information of the antenna panel structure.

[0011] Optionally, in the characteristic parameter setting module, the characteristic length information of the honeycomb interlayer includes the length w of the main side of the honeycomb characteristic structure, the length L of the secondary side of the honeycomb characteristic structure projected on the main side line, the angle coefficient α of the long and short sides of the honeycomb characteristic structure and the thickness H of the honeycomb characteristic structure.

[0012] Optionally, in the characteristic parameter setting module, the antenna panel geometry information is created using shell elements according to four parameters W, L, α, and H and based on the Kirchhoff plane assumption.

[0013] Optionally, in the material parameter setting module, the property information of the composite material includes the modulus, density, expansion coefficient, thermal conductivity and specific heat capacity of the composite material.

[0014] Optionally, in the material parameter setting module, the setting of the layup information of the antenna panel structure is to divide the antenna panel into two parts, a skin and a sandwich, and set the layup information of the composite material separately, and the layup information includes the number of composite material laying layers, the thickness of each layer and the corresponding fiber laying angle.

[0015] Optionally, in the file export module, the construction of the honeycomb sandwich antenna panel solid model is based on the modeling software Catia, calling two Python modules pycatia and win32com.

[0016] Optionally, the file export module uses the following instructions to build a honeycomb sandwich antenna panel entity model in Catia:

[0017] In Matlab, the Python program is introduced through the py.importlib.import_module module, so that Matlab can call the Python program and complete the information communication between Matlab and Python.

[0018] Use addnewpointcoord and addnewcirclectrradwithangles commands to build the skin contour of the antenna panel; according to the surface contour, use addsectiontoloft and addnewoffset commands to create the skin structure;

[0019] According to the characteristic length information of the honeycomb sandwich, the addnewpolyline and addnewpointonplane commands are used to complete the construction of the sandwich contour; further, the addnewextrude and addnewhybridsplit commands are used to construct the honeycomb sandwich antenna panel solid model.

[0020] Optionally, in the file export module, the finite element simulation model of the honeycomb sandwich antenna panel is constructed in accordance with the format rules of the input file in the finite element simulation software ABAQUS, an INP model file is created, and after the INP model file is read by ABAQUS, environmental parameters are set and simulation is performed.

[0021] The beneficial effects of the present invention are as follows: the present invention can very conveniently construct a composite material honeycomb sandwich antenna panel model based on geometric parameters and material properties, which is used to quickly construct a composite material honeycomb sandwich antenna panel model, and is helpful to study the influence of changes in the geometric parameters of the honeycomb sandwich and the panel material on the performance of the antenna panel to be studied, and provides a convenient modeling platform for the subsequent optimization of the panel structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Flowchart of the operations of the system for parametric modeling of composite honeycomb sandwich antenna panels.

[0023] Figure 2 Schematic diagram of the antenna panel model.

[0024] Figure 3 The main interface of the system for parametric modeling of composite honeycomb sandwich antenna panels.

[0025] Figure 4 Schematic diagram of the geometric characteristics of a unit cell of a honeycomb corrugated plate.

[0026] Figure 5 Schematic diagram of the creation process of the honeycomb sandwich for the antenna panel.

[0027] Figure 6 It is an input interface for composite material property information in the parametric modeling system of composite honeycomb sandwich antenna panels.

[0028] Figure 7 It is the input interface for the ply information of the antenna panel structure in the parametric modeling system of composite honeycomb sandwich antenna panels. DETAILED DESCRIPTION

[0029] The present invention will now be described in further detail with reference to the accompanying drawings.

[0030] Composite honeycomb sandwich structures can be used in high-precision submillimeter-wave astronomical telescope antenna panel systems, and have excellent characteristics of high specific stiffness, specific strength, and low expansion. Depending on the site environment and the telescope observation band, the design performance parameters of the panel structure are also different, so it is necessary to build a fast parametric modeling platform.

[0031] like Figure 1 As shown, the present invention proposes a parametric modeling system for composite honeycomb sandwich antenna panels, and its process is as follows Figure 1 As shown. Figure 2 The panel structure shown constructs a honeycomb sandwich antenna panel. A user interactive interface is established based on the Appdesigner module of Matlab, and a honeycomb corrugated plate characteristic parameter generation program is embedded therein. The user inputs parameters such as the characteristic length of the honeycomb unit cell, basic properties of the composite material, and antenna panel ply, and the system will construct a honeycomb sandwich antenna panel model that meets the parameters.

[0032] User interactive interface such as Figure 3 As shown, the user can determine the file storage address module, feature parameter setting module, material parameter setting module and file export module. The operation method of the composite honeycomb sandwich antenna panel parametric modeling system is as follows:

[0033] (1) Select the file storage address and determine the save path after the model file is exported;

[0034] (2) In the characteristic parameter setting module, according to the characteristic length diagram of the honeycomb corrugated plate unit cell, the corresponding characteristic length information is input respectively, and then the antenna panel is constructed according to the input parameters;

[0035] (3) In the material parameter setting module, input the property information of the composite material and the ply information of the antenna panel structure;

[0036] (4) According to the research requirements, the corresponding model files are output according to the information content of the honeycomb corrugated plate sandwich antenna panel solid model and the finite element simulation.

[0037] Figure 4The geometric characteristics of the honeycomb corrugated plate sandwich unit cell are shown, among which the characteristic side lengths W and L, the characteristic angle α and the sandwich characteristic height H are necessary parameters. W is the length of the main side of the honeycomb characteristic structure, L is the length of the secondary side of the honeycomb characteristic structure projected on the main side line, α is the angle coefficient of the long and short sides of the honeycomb characteristic structure, and H is the thickness of the honeycomb characteristic structure. According to the above four parameters and based on the Kirchhoff plane assumption, after clicking "Confirm Parameters", the system uses the shell element (Shell Element) according to Figure 5 The array arrangement shown creates antenna panel geometry information.

[0038] In order to realize the environmental thermal deformation simulation of the antenna panel under specific characteristic parameters, based on the rules of creating attributes and sections in ABAQUS, Figure 6 The composite material property information input interface shown in the figure inputs the composite material's modulus, density, expansion coefficient, thermal conductivity, and specific heat capacity. At the same time, the antenna panel is divided into two parts: the skin and the interlayer. Figure 7 The ply information input interface of the antenna panel structure shown sets the ply information of the composite material respectively. After entering the number of plies of the component, click "Parameter Input" to obtain the total ply information setting table. The total number of rows in the table represents the number of plies, where the table content can determine the ply angle and ply thickness of each layer. Further, the user can choose whether the component ply is in a symmetrical ply state. Taking the ply number of 4 layers and the ply angle of [45% 45° / 45% 45°] as an example, when the user starts the symmetrical ply state, the number of plies of the current component will increase to 8 layers, and the ply angle will change to [45° / -45° / 45° / -45°]s. Finally, click "Save Parameters" to store the material properties and other information entered above.

[0039] The composite honeycomb sandwich antenna panel parametric modeling system allows users to export two different models. Select "STP file export" to obtain the honeycomb sandwich antenna panel solid model. The model is generated based on the template of the VB secondary development content of the modeling software Catia, calling the two Python modules pycatia and win32com to implement the script commands compiled in the Python development environment (PDE) in Catia and perform parametric modeling. According to the antenna panel geometry information, the following instructions are used to build the antenna panel model in Catia:

[0040] (1) In Matlab, the Python program is introduced through the py.importlib.import_module module, so that Matlab can call the Python program and complete the information communication between Matlab and Python;

[0041] (2) Use the addnewpointcoord and addnewcircletrackwithangles commands to construct the skin contour of the antenna panel; according to the surface contour, use the addsectiontoloft and addnewoffset commands to create the skin structure;

[0042] (3) According to the characteristic length information of the honeycomb sandwich, the addnewpolyline and addnewpointonplane commands are used to complete the construction of the sandwich contour; further, the addnewextrude and addnewhybridsplit commands are used to construct the sandwich contour to realize the construction of the solid honeycomb sandwich structure.

[0043] Select "INP file export" to obtain the finite element simulation model of the honeycomb sandwich antenna panel. Create an INP file according to the format rules of the input file (*.INP) in the finite element simulation software ABAQUS. After reading the model file through ABAQUS, set the environmental parameters and perform the next simulation. According to the antenna panel geometry information, the property information of the composite material and the ply information of the antenna panel structure, use the following keyword commands to set the model parameters, material properties and other information:

[0044] (1) The keyword “*Node” is used to represent the node information in the model, including the node number and the coordinates in the X, Y, and Z directions;

[0045] (2) The keyword "*Element" is used to indicate the information of the element in the model, where "Type = S4RT" indicates that the element is set to a four-node reduced integration shell element for thermal-mechanical coupling. The element information includes: the element number and the node number based on the right-handed spiral direction;

[0046] (3) The keyword “*Material” is used to create material properties, where “*Density” is used to determine the material density parameter, “*Elastic, type=LAMINA” is used to determine the material modulus parameter in the laminate form, “*Conductivity, type=ORTHO” is used to determine the thermal conductivity parameter in the anisotropic form, “*Expansion, type=ORTHO” is used to determine the expansion coefficient parameter in the anisotropic form, and “*Specific Heat” is used to determine the material specific heat capacity coefficient;

[0047] (4) The keyword “*Shell Section” is used to create the cross-sectional properties of the skin and sandwich, including the number of structural plies, the angle of the single ply, the properties assigned to the composite material, and the thickness of the single ply.

[0048] The above are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should be regarded as the protection scope of the present invention.

Claims

1. A composite honeycomb sandwich antenna panel parametric modeling system, characterized in that: include: The module for determining the file storage address is used to select the address for file storage and determine the saving path of the model file after export; A characteristic parameter setting module is used to create antenna panel geometry information according to the input characteristic length information of the honeycomb sandwich; A material parameter setting module is used to set the property information of the composite material and the ply information of the antenna panel structure; The file export module is used to construct and output a honeycomb sandwich antenna panel solid model according to the antenna panel geometric information, and to construct and output a honeycomb sandwich antenna panel finite element simulation model according to the antenna panel geometric information, the property information of the composite material and the layup information of the antenna panel structure.

2. A composite material honeycomb sandwich antenna panel parametric modeling system according to claim 1, characterized in that: In the characteristic parameter setting module, the characteristic length information of the honeycomb interlayer includes the length w of the main side of the honeycomb characteristic structure, the length L of the secondary side of the honeycomb characteristic structure projected on the main side line, the angle coefficient α of the long and short sides of the honeycomb characteristic structure and the thickness H of the honeycomb characteristic structure.

3. A composite material honeycomb sandwich antenna panel parametric modeling system as claimed in claim 2, characterized in that: In the characteristic parameter setting module, the antenna panel geometric information is created using shell elements according to the four parameters W, L, α, and H and based on the Kirchhoff plane assumption.

4. A composite material honeycomb sandwich antenna panel parametric modeling system as claimed in claim 1, characterized in that: In the material parameter setting module, the property information of the composite material includes the modulus, density, expansion coefficient, thermal conductivity and specific heat capacity of the composite material.

5. A composite material honeycomb sandwich antenna panel parametric modeling system according to claim 1, characterized in that: In the material parameter setting module, the setting of the layup information of the antenna panel structure is to divide the antenna panel into two parts, the skin and the interlayer, and set the layup information of the composite material respectively. The layup information includes the number of composite material laying layers, the thickness of each layer and the corresponding fiber laying angle.

6. A composite material honeycomb sandwich antenna panel parametric modeling system as claimed in claim 1, characterized in that: In the file export module, the construction of the honeycomb sandwich antenna panel entity model is based on the modeling software Catia, calling two Python modules pycatia and win32com.

7. A composite material honeycomb sandwich antenna panel parametric modeling system as claimed in claim 6, characterized in that: The file export module uses the following instructions to build a honeycomb sandwich antenna panel solid model in Catia: In Matlab, the Python program is introduced through the py.importlib.import_module module, so that Matlab can call the Python program and complete the information communication between Matlab and Python. Use addnewpointcoord and addnewcirclectrradwithangles commands to build the skin contour of the antenna panel; according to the surface contour, use addsectiontoloft and addnewoffset commands to create the skin structure; According to the characteristic length information of the honeycomb sandwich, the addnewpolyline and addnewpointonplane commands are used to complete the construction of the sandwich contour; further, the addnewextrude and addnewhybridsplit commands are used to construct the honeycomb sandwich antenna panel solid model.

8. A composite material honeycomb sandwich antenna panel parametric modeling system as claimed in claim 1, characterized in that: In the file export module, the construction of the finite element simulation model of the honeycomb sandwich antenna panel is based on the format rules of the input file in the finite element simulation software ABAQUS, an INP model file is created, and after the INP model file is read by ABAQUS, environmental parameters are set and simulation is performed.

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