An antenna structure optimization design method and system

Abstract

The present application provides a method and system for optimizing the design of an antenna structure, which relates to the field of digital antenna design. The method for lightweight optimization design of the structure includes: determining a structural model according to the structural installation requirements of a composite phased array antenna; taking the structural strength limit and the electrical performance design limit as design constraints to determine design indicators and reliability requirements; extracting design parameters and determining noise parameters; establishing the relationships between the design parameters, noise parameters, optimization objectives, and design constraints and establishing a surrogate model; performing reliability optimization design on the structure of the composite phased array antenna to determine the target solution that meets the design constraints and characterizes the corresponding design parameters. The present application can achieve a more thorough lightweight design of the phased array antenna structure, while ensuring that its rigidity, strength, and electrical performance indicators meet the requirements of high reliability, can greatly improve the design iteration cycle of the composite phased array antenna, and significantly reduce the development cost.

Description

Technical Field

[0001] This application relates to the technical field of antenna digital design, and particularly relates to a method and system for optimizing the design of an antenna structure. Background Art

[0002] A phased array antenna usually consists of functional units such as an antenna element array, a processing chassis, a power supply chassis, a transceiver module, etc. These functional units are installed on an antenna structure composed of an antenna element mounting plate and an antenna back frame, which serves as the main load-bearing structure.

[0003] In the related art, the antenna structure is processed from relatively light metal materials such as aluminum alloy. Considering that composite materials have good stiffness and light weight, in recent years, in the aerospace application field with strict weight requirements, the antenna structure mainly composed of composite materials has gradually become the mainstream. Composite materials are very different from traditional single-element and homogeneous metal materials. Their structural dimensions and material mechanical properties are highly sensitive to the processing environment and manufacturing process, showing typical characteristics of anisotropic and large dispersion in mechanical properties.

[0004] The traditional design method based on safety factors cannot consider the uncertainties of the structural dimensions and material mechanical properties of composite materials, which easily leads to excessive stiffness and strength performance redundancy in the composite material antenna structure, with a large weight margin, and cannot reflect the lightweight advantage of the composite material phased array antenna structure, which is not conducive to its application in the aerospace field; therefore, there is an urgent need to propose a method and system for optimizing the design of an antenna structure that can consider uncertainties. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, this application provides a method and system for optimizing the design of an antenna structure, which solves the problems of great difficulty in the lightweight design of the composite material phased array antenna in the aerospace application field and the difficulty in balancing reliability, stiffness, strength, and lightweight.

[0006] To achieve the above objectives, this application is realized through the following technical solutions:

[0007] In a first aspect, an embodiment of the present application provides a method for optimizing the design of an antenna structure. The method for optimizing the lightweight design of the structure includes: determining a corresponding structural model according to the structural installation requirements of a composite phased array antenna; taking the structural strength limit and electrical performance design limit of the composite phased array antenna as design constraints, determining the design indexes of the design constraints and the corresponding reliability requirements, and obtaining a limit state space based on the design constraints; extracting the design parameters of the composite phased array antenna according to the structural model, where the design parameters include deterministic design parameters and random design parameters; determining the noise parameters of the composite phased array antenna that follow a random probability distribution, where the noise parameters are related to the design constraints and include the prepreg ply direction, the thickness of a single-layer prepreg, and the position fluctuation of the antenna element installation points on the antenna element mounting plate; based on the structural model, establishing the relationship between the design parameters, the noise parameters, the optimization objective, and the design constraints, and establishing a surrogate model; where the optimization objective is the structural weight of the composite phased array antenna; based on the noise parameters and the optimization objective, taking the design parameters as variables and using the limit state space as the optimization constraint, establishing a reliability optimization model; and performing reliability optimization design on the structure of the composite phased array antenna to determine the target solution that satisfies the design constraints and characterizes the corresponding design parameters.

[0008] In a second aspect, an embodiment of the present application provides a system for optimizing the design of an antenna structure. The system for optimizing the lightweight design of the structure includes: a first determination module, a second determination module, an extraction module, a third determination module, a first establishment module, a second establishment module, and an optimization design module.

[0009] Specifically, the first determination module is configured to determine a corresponding structural model according to the structural installation requirements of the composite phased array antenna; the second determination module is configured to determine the design indexes of the design constraints and the corresponding reliability requirements with the structural strength limit and the electrical performance design limit of the composite phased array antenna as the design constraints, so as to obtain the limit state space based on the design constraints; the extraction module is configured to extract the design parameters of the composite phased array antenna according to the structural model, where the design parameters include deterministic design parameters and random design parameters; the third determination module is configured to determine the noise parameters of the composite phased array antenna that follow a random probability distribution, where the noise parameters are related to the design constraints and include the pre-preg ply direction, the single-layer pre-preg thickness, and the position fluctuation of the antenna element installation points on the antenna element mounting plate; the first establishment module is configured to establish the relationships among the design parameters, the noise parameters, the optimization objective, and the design constraints based on the structural model, and establish a surrogate model; where the optimization objective is the structural weight of the composite phased array antenna; the second establishment module is configured to establish a reliability optimization model based on the noise parameters and the optimization objective, with the design parameters as variables and the limit state space as the optimization constraint; the optimization design module is configured to perform reliability optimization design on the structure of the composite phased array antenna to determine the target solution that satisfies the design constraints and characterizes the corresponding design parameters.

[0010] In a third aspect, an embodiment of the present application provides an electronic device, which includes: a processor, a memory, and a program stored on the memory and executable on the processor. When the program is executed by the processor, the antenna structure optimization design method in the foregoing first aspect is implemented.

[0011] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by the processor, the antenna structure optimization design method in the foregoing first aspect is implemented.

[0012] The present application provides an antenna structure optimization design method and system. Compared with the prior art, the following beneficial effects are achieved:

[0013] When designing the design parameters of this application, deterministic design parameters and random design parameters are considered, and the uncertainties of the structural dimensions and material mechanical properties of the composite phased array antenna are considered; the design constraints include the structural strength limit and the electrical performance design limit. Combining various loads borne by the antenna structure during its service life, the stiffness and strength index analysis of the antenna structure is carried out. Based on the stiffness, strength and electrical performance of the antenna structure during the service stage, considering the uncertainties of the structural dimensions and material properties, this application can quickly optimize the weight of the antenna structure with the structural weight of the composite phased array antenna as the optimization goal under the condition of ensuring the confidence level of the antenna structure performance. Compared with the conventional design method based on the safety factor, this application can achieve a more thorough lightweight design of the phased array antenna structure, while ensuring that its stiffness, strength and electrical performance indicators meet the required high reliability, which can greatly improve the design iteration cycle of the composite phased array antenna and significantly reduce the development cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0015] Figure 1 It is a schematic flow chart of an antenna structure optimization design method provided by an embodiment of this application;

[0016] Figure 2 is Figure 1 An exemplary flow chart of S150 in

[0017] Figure 3 is Figure 1 Another exemplary flow chart of S150 in

[0018] Figure 4 It is a schematic structural diagram of an exemplary composite phased array antenna provided by an embodiment of this application;

[0019] Figure 5 It is a schematic structural diagram of an antenna structure optimization design system provided by an embodiment of this application;

[0020] Figure 6 It is a schematic structural diagram of an electronic device provided by an embodiment of this application.

[0021] Reference numerals: Antenna element mounting plate 101; Antenna element mounting hole 102; Back frame 103. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely. Apparently, the described embodiments are only a part rather than all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or sequence between these entities or operations. Moreover, the terms "include", "comprise" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.

[0024] By providing an antenna structure optimization design method and system in the embodiments of the present application, the problems of difficult structural lightweight design of composite phased array antennas and the difficulty in balancing reliability, stiffness, strength and lightweight in the current aerospace application field are solved.

[0025] The overall idea of the technical solutions in the embodiments of the present application to solve the above technical problems is as follows:

[0026] A phased array antenna usually consists of functional units such as an antenna element array, a processing chassis, a power supply chassis, a transceiver module, etc. These functional units are installed on an antenna structure composed of an antenna element mounting plate and an antenna back frame as the main load-bearing structure.

[0027] In the related art, the antenna structure is processed from relatively light metal materials such as aluminum alloy. Considering the good stiffness and light weight of composite materials, in recent years, in the aerospace application field with strict weight requirements, the antenna structure mainly composed of composite materials has gradually become the mainstream. Composite materials are very different from traditional single-element and homogeneous metal materials. Their structural dimensions and material mechanical properties are highly sensitive to the processing environment and manufacturing process, showing typical characteristics of anisotropic and large dispersion of mechanical properties.

[0028] The traditional design method based on safety factors cannot consider the uncertainties of the composite material structure size and material mechanical properties, which easily leads to excessive stiffness and strength performance redundancy in the composite material antenna structure, with a large weight margin, unable to reflect the lightweight advantage of the composite material phased array antenna structure and being unfavorable for its application in the aerospace field; therefore, there is an urgent need to propose an antenna structure optimization design method and system that can consider uncertainties.

[0029] To better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings of the specification and specific implementation manners.

[0030] First, an antenna structure optimization design method provided by an embodiment of the present application will be introduced below.

[0031] The flowchart of an antenna structure optimization design method provided by an embodiment of the present application is as Figure 1 shown, and this lightweight structure optimization design method may include the following steps S110 - S170.

[0032] S110. Determine the corresponding structure model according to the structural installation requirements of the composite material phased array antenna.

[0033] S120. Take the structural strength limit and electrical performance design limit of the composite material phased array antenna as design constraints, determine the design indicators of the design constraints and the corresponding reliability requirements, and obtain the limit state space based on the design constraints.

[0034] S130. Extract the design parameters of the composite material phased array antenna according to the structure model, and the design parameters include deterministic design parameters and random design parameters.

[0035] S140. Determine the noise parameters of the composite material phased array antenna that follow a random probability distribution. The noise parameters are related to the design constraints and include the prepreg ply direction, the thickness of a single prepreg ply, and the position fluctuations of the antenna element installation points on the antenna element mounting plate. It can be understood that the noise parameters are non - optimizable parameters that follow a random probability distribution, and the probability distribution of the noise parameters may be common probability distributions such as normal distribution and Poisson distribution.

[0036] S150. Based on the structure model, establish the relationships between the design parameters, noise parameters, optimization objective, and design constraints, and establish a surrogate model; where the optimization objective is the structural weight of the composite material phased array antenna.

[0037] S160. Based on the noise parameters and the optimization objective, establish a reliability optimization model with the design parameters as variables and the limit state space as the optimization constraint.

[0038] S170. Perform reliability optimization design on the structure of the composite material phased array antenna to determine a target solution that satisfies the design constraints and characterizes the corresponding design parameters.

[0039] The above is a specific implementation method of an antenna structure optimization design method provided in an embodiment of the present application. It can be understood that when designing design parameters, the present application takes into account deterministic design parameters and random design parameters, and takes into account the uncertainty of the structural size and material mechanical properties of the composite phased array antenna; the design constraints include structural strength limits and electrical performance design limits, and the stiffness and strength index analysis of the antenna structure is performed in combination with the various loads borne by the antenna structure during service.

[0040] Based on this, this application can optimize the weight of the antenna structure quickly based on the rigidity and electrical performance of the antenna structure during the service phase, taking into account the uncertainty of the structural size and material properties, and taking the structural weight of the composite phased array antenna as the optimization target while ensuring the confidence level of the antenna structure performance. Compared with the conventional design method based on safety factor, this application can achieve a more thorough lightweight design of the phased array antenna structure, while ensuring that its rigidity and electrical performance indicators meet the required high reliability, which can greatly improve the design iteration cycle of the composite phased array antenna and significantly reduce the development cost.

[0041] It should be noted that the position fluctuation of the antenna unit installation point is caused by the manufacturing tolerance. The noise parameters will affect the design constraints of the phased array antenna, but the random parameters that cannot be optimized or are difficult to optimize are selected. , Single-layer carbon fiber cloth thickness , Antenna unit mounting point position machining error on the antenna unit mounting plate etc. are noise parameters.

[0042] In one example, the prepreg ply direction and the thickness of a single prepreg layer are related to the structural stiffness of the composite phased array antenna, and the position fluctuation of the antenna unit mounting point is related to the electrical performance of the composite phased array antenna.

[0043] It is understandable that the prepreg ply direction and the thickness of a single prepreg layer will affect the structural rigidity of the composite phased array antenna, and the position fluctuation of the antenna unit installation point will have a direct impact on the electrical performance of the composite phased array antenna. By determining the mean and variance of the prepreg ply direction, the thickness of a single prepreg layer, and the position fluctuation of the antenna unit installation point based on experience or experimental data, the design constraints and uncertainties of the composite phased array antenna structure can be calculated.

[0044] In some embodiments, the above-mentioned determining the corresponding structural model according to the structural installation requirements of the composite material phased array antenna, that is, the above-mentioned S110 may specifically include the following steps:

[0045] S210. Obtain the structural installation requirements of the composite phased array antenna. The structural installation requirements include the installation interfaces and the outer envelope of multiple single-unit modules. The multiple single-unit modules include an antenna element array, a power supply chassis, and a transceiver module.

[0046] S220. Based on the structural installation requirements, determine the structural design information of the composite phased array antenna. The structural design information includes the outer dimensions, the composite material structure design, the positions of the metal inlays, and the structural installation interfaces.

[0047] S230. Determine the structural model of the composite phased array antenna according to the structural design information.

[0048] In the embodiments of the present application, it can be understood that a phased array antenna refers to an antenna that changes the pattern shape by controlling the feeding phases of the radiation elements in the array antenna. Controlling the phases can change the pointing direction of the maximum value of the antenna pattern to achieve the purpose of beam scanning. The composite phased array antenna is provided with multiple single-unit modules. After determining the specific structural installation requirements, corresponding in-depth design can be carried out to obtain the corresponding structural model.

[0049] In one example, as Figure 4 shown, the structure of the composite phased array antenna is composed of an antenna element mounting plate 101 and a back frame 103. There are antenna element mounting holes 102 distributed in an array on the antenna element mounting plate 101. The antenna element mounting holes 102 are used to mount the antenna element array. The back frame 103 is spliced by carbon fiber hollow square tubes, and there are metal inlays at the interfaces.

[0050] Exemplarily, the antenna element mounting plate 101 can be a sandwich structure. The two skins of the antenna element mounting plate 101 are carbon fiber cloths, which are laminated by multiple layers of carbon fiber prepregs. The middle layer of the antenna element mounting plate 101 is a foam material and is installed on the back frame by rivets.

[0051] In some embodiments, the design indicators of the structural strength limit include the maximum von Mises stress, the maximum shear force of the composite core material, the maximum strain of the composite skin, and the Tsai-Wu coefficient, as well as the buckling eigenvalue of the buckling failure of the rod or panel; the electrical performance design limit is used to characterize the overall electrical performance of the composite phased array antenna, and the corresponding design indicators include the pattern, the pointing angle deviation, the gain loss, and the sidelobe elevation.

[0052] In the embodiments of the present application, it can be understood that in the design process of the composite phased array antenna of the present application, the structural strength limit and the electrical performance design limit of the antenna are considered; for the structural strength limit, considering that the metal inlays in the antenna structure generally fail plastically, the maximum von Mises stress As its strength limit; considering the diverse failure modes of composite materials in the antenna structure, mainly including shear failure of foam core materials, skin damage failure, and buckling instability failure of carbon fiber square tubes, the maximum shear force of the composite material foam core is used as the strength limit, the maximum strain of the composite material skin is used and the Tsai-Wu coefficient TW as the strength limit. For the buckling failure of the carbon fiber square tube in the antenna structure, the buckling eigenvalue is used as the buckling instability limit.

[0053] Furthermore, for the design limit of the electrical performance of the antenna, considering that the deformation of the phased array antenna structure during service will cause position deviation at the antenna element installation points, thereby affecting the electrical performance of the phased array antenna, the overall electrical performance index of the phased array antenna is used as the design limit of the phased array antenna structure in this application. Specifically, the electrical performance uses pointing angle deviation , gain loss and sidelobe elevation and other indicators. The design reliability requirements for the strength limit and electrical performance limit can be determined to be 99.9%, thereby obtaining the limit state space of the phased array antenna structure based on design constraints.

[0054] In some embodiments, the deterministic design parameters include: the caliber and length of the composite material rod, the thickness and caliber of the antenna element installation surface; the random design parameters include: the longitudinal tensile modulus characterizing the mechanical properties of a single layer of carbon fiber cloth, the latitudinal tensile modulus , the shear modulus and the Poisson's ratio .

[0055] In the embodiments of this application, it can be understood that the design parameters of the phased array antenna structure include deterministic design parameters and random design parameters. Design parameters are parameters that directly affect the design constraints and design objectives of the antenna structure; according to the structural model, the deterministic design parameters and random design parameters of the antenna structure can be extracted. Deterministic design parameters are design parameters without uncertainty. The caliber , length (horizontal tube) , thickness , the foam thickness of the antenna element installation board and the carbon fiber skin thickness of the carbon fiber square tube are selected as deterministic design parameters.

[0056] In addition, random design parameters are design parameters with uncertainty. Due to the uncertainty of the composite material processing technology, the random design parameters take the mechanical properties of a single layer of carbon fiber cloth (i.e., the longitudinal tensile modulus , the latitudinal tensile modulus , the shear modulus , Poisson's ratio ), all follow a normal distribution, and the mean and variance of the random design parameters can be determined based on experience or experimental data.

[0057] In some embodiments, based on the foregoing structural model, the relationships between the design parameters, noise parameters, optimization objectives, and design constraints are established, and a surrogate model is established. That is, the foregoing S150 may specifically include the following steps:

[0058] S310. Construct a corresponding finite element model based on the structural model of the composite phased array antenna, and the structural model is a CAD model.

[0059] S320. According to the load conditions of the antenna structure corresponding to the finite element model in the service state, conduct structural stiffness and strength analysis to obtain the strength analysis result and the stiffness analysis result; the load conditions include acceleration overload, vibration, and self-weight representing the optimization objective.

[0060] S330. Extract strength indicators according to the strength analysis result to obtain the relationship between the design parameters, noise parameters, and strength response.

[0061] S340. According to the stiffness analysis result, extract the change in the position vector of the antenna element installation point during the service of the phased array antenna.

[0062] S350. Based on the change in the position vector, combine the noise parameters to obtain the comprehensive change in the position vector of the antenna element installation point, and determine the relationship between the design parameters, noise parameters, and electrical performance constraints including the gain, sidelobe level, and pointing angle deviation of the phased array antenna.

[0063] In the embodiments of the present application, it can be understood that according to the phased array antenna structure model, the design parameters, noise parameters (single-layer prepreg thickness , machining error of the position of the antenna element installation point ), and the relationship with the optimization objective (structural weight of the phased array antenna ) can be obtained.

[0064] Establish a finite element model according to the composite phased array antenna structure, conduct structural stiffness and strength analysis according to the load conditions of the antenna structure in the service state, obtain the structural strength and stiffness analysis results, and strength indicators can be extracted to obtain the relationship between the design parameters, noise parameters, and strength response.

[0065] According to the stiffness analysis result of the phased array antenna, the change in the position vector of the antenna element installation point during the service of the phased array antenna can be extracted. Combining the noise parameters, the comprehensive change in the position vector of the antenna element installation point can be obtained, so as to obtain the relationship between the design parameters, noise parameters, and electrical performance constraints such as the gain, sidelobe level, and pointing angle deviation of the phased array antenna.

[0066] In one example, the present application conducts experimental research on the main design constraints, design parameters, noise factors, optimization objectives and their optimal values in the design process of the composite phased array antenna. For relevant data, please refer to Table 1.

[0067] Table 1

[0068]

[0069] In one example, the electrical performance of the aforementioned composite phased array antenna satisfies the expression:

[0070]

[0071] In the formula, is the phased array antenna pattern and is used to characterize the electrical performance index, is the excitation current loaded onto the antenna element, is the pattern of the antenna element, represents the wave constant, is the wavelength, is the unit polarization vector, is the original position vector of the radiation element, is the comprehensive change amount of the radiation element position vector, is the number of the radiation element, is the total number of radiation elements.

[0072] In some embodiments, based on the aforementioned structural model, the relationships between the design parameters, noise parameters, optimization objectives and design constraints are established, and a surrogate model is established. That is, the aforementioned S150 may specifically further include the following steps:

[0073] S410. Use the Latin hypercube sampling method to sample all the design parameters and noise parameters to select sample points, and obtain the sampling result.

[0074] S420. According to the sampling result, establish a calculation model for the service conditions of different design parameters and noises.

[0075] S430. Calculate all the service condition calculation models to obtain the analysis results of the strength response and electrical performance response under the service conditions.

[0076] S440. Based on the analysis results of the strength response and electrical performance response, use the design parameters and the corresponding index response values as input and output, and use the Kriging interpolation technique to fit and establish a deterministic Kriging surrogate model.

[0077] In one example, the aforementioned reliability optimization model satisfies the expression:

[0078]

[0079]

[0080]

[0081]

[0082]

[0083]

[0084] In the formula: is a deterministic design variable, is the minimum value of the deterministic design variable, is the maximum value of the deterministic design variable; is a random design variable; is a noise parameter; is the mean value of the random design variable, is the minimum value of the mean value of the random design variable, is the maximum value of the mean value of the random design variable; is the mean value of the noise parameter; is the objective optimization function and characterizes the structural weight of the composite phased array antenna;

[0085] is the probability constraint function of the th strength limit index, is the threshold value of the strength limit index, is the probability of the th strength limit index;

[0086] is the probability constraint function of the th electrical performance limit index, is the threshold value of the electrical performance limit index, is the th probability of the electrical performance limit index; and are both positive integers.

[0087] In some embodiments, the foregoing reliability optimization design of the structure of the composite phased array antenna is performed to determine the target solution that satisfies the design constraints and characterizes the corresponding design parameters, that is, the foregoing S170 may specifically include the following steps:

[0088] S510. Use the SORA method to decompose the reliability optimization design of the design parameters into reliability analysis and deterministic optimization and perform iterative processing; among them, the reliability analysis is performed by the Monte Carlo method.

[0089] S520. During the iterative analysis process, the response values corresponding to different design variables in the surrogate model are called each time, and it is determined whether the constraint conditions are satisfied. The solutions that meet the constraint conditions are output as the target solutions.

[0090] In some embodiments, the present application provides an antenna structure optimization design system 600, as Figure 5 shown. The lightweight optimization design system 600 of this structure may include the following modules:

[0091] A first determination module 610, configured to determine the corresponding structural model according to the structural installation requirements of the composite phased array antenna;

[0092] A second determination module 620, configured to use the structural strength limit and electrical performance design limit of the composite phased array antenna as design constraints, determine the design indicators of the design constraints and the corresponding reliability requirements, and obtain the limit state space based on the design constraints;

[0093] An extraction module 630, configured to extract the design parameters of the composite phased array antenna according to the structural model, where the design parameters include deterministic design parameters and random design parameters;

[0094] A third determination module 640, configured to determine the noise parameters of the composite phased array antenna that follow a random probability distribution. The noise parameters are related to the design constraints and include the pre-preg ply direction, the thickness of a single layer of pre-preg, and the position fluctuation of the antenna element mounting points on the antenna element mounting plate;

[0095] A first establishment module 650, configured to establish the relationship between the design parameters, noise parameters, optimization objectives, and design constraints based on the structural model, and establish a surrogate model; where the optimization objective is the structural weight of the composite phased array antenna;

[0096] A second establishment module 660, configured to establish a reliability optimization model based on the noise parameters and optimization objectives, with the design parameters as variables and the limit state space as the optimization constraint;

[0097] An optimization design module 670, configured to perform reliability optimization design on the structure of the composite phased array antenna to determine the target solutions that meet the design constraints and characterize the corresponding design parameters.

[0098] In some other alternative embodiments, the antenna structure optimization design system 600 provided by the present application may further include a central processing module 680. The central processing module 680 may be configured to send control instructions to other modules and coordinate the actions of other modules. All other modules are connected to the central processing module 680 and receive its control instructions.

[0099] According to an embodiment of the present application, any multiple of the first determination module 610, the second determination module 620, the extraction module 630, the third determination module 640, the first establishment module 650, the second establishment module 660, the optimization design module 670, and the central processing module 680 may be combined and implemented in one module, or any one of them may be split into multiple modules. Alternatively, at least part of the functions of one or more of these modules may be combined with at least part of the functions of other modules and implemented in one module.

[0100] In some embodiments, the first determination module 610 may specifically be configured to:

[0101] Obtain the structural installation requirements of the composite material phased array antenna, where the structural installation requirements include the installation interfaces and the outer shape envelopes of multiple single-unit modules, and the multiple single-unit modules include an antenna element array, a power supply chassis, and a transceiver module;

[0102] Based on the structural installation requirements, determine the structural design information of the composite material phased array antenna, where the structural design information includes the outer dimensions, the composite material structure design, the positions of the metal inlays, and the structural installation interfaces;

[0103] Determine the structural model of the composite material phased array antenna according to the structural design information.

[0104] In some embodiments, the first establishment module 650 may specifically be configured to:

[0105] Construct a corresponding finite element model based on the structural model of the composite material phased array antenna, where the structural model is a CAD model;

[0106] According to the load conditions of the antenna structure corresponding to the finite element model in the service state, conduct a structural stiffness and strength analysis to obtain the strength analysis result and the stiffness analysis result; the load conditions include acceleration overload, vibration, and the self-weight characterizing the optimization objective;

[0107] Extract strength indicators according to the strength analysis result to obtain the relationship between the design parameters, the noise parameters, and the strength response;

[0108] According to the stiffness analysis result, extract the position vector change of the antenna element installation points during the service of the phased array antenna;

[0109] Based on the position vector change, combine the noise parameters to obtain the comprehensive position vector change of the antenna element installation points, and determine the relationship between the design parameters, the noise parameters, and the electrical performance constraints including the gain, the sidelobe level, and the pointing angle deviation of the phased array antenna.

[0110] In some embodiments, the first establishment module 650 may specifically further be configured to:

[0111] Use the Latin hypercube sampling method to sample all design parameters and noise parameters to select sample points, and obtain the sampling results;

[0112] According to the sampling results, establish calculation models for service conditions of different design parameters and noises;

[0113] Calculate all the service condition calculation models to obtain the analysis results of strength response and electrical performance response under service conditions;

[0114] Based on the analysis results of strength response and electrical performance response, use the design parameters and the corresponding index response values as input and output, and use Kriging interpolation technology to fit and establish a deterministic Kriging surrogate model.

[0115] In some embodiments, the optimization design module 670 can specifically be used for:

[0116] Use the SORA method to decompose the reliability optimization design of design parameters into reliability analysis and deterministic optimization and perform iterative processing; among them, the reliability analysis is carried out by the Monte Carlo method;

[0117] In the iterative analysis process, each time the response values corresponding to different design variables in the surrogate model are called, and it is judged whether the constraint conditions are satisfied, and the solutions that meet the constraint conditions are output as the target solutions.

[0118] Figure 5 Each module in the shown system has the functions of implementing each step in the foregoing antenna structure optimization design method and can achieve its corresponding technical effects. For the sake of brevity, it will not be described in detail here.

[0119] In some embodiments, the present application provides an electronic device, and the structural schematic diagram of the electronic device is as Figure 6 shown.

[0120] The electronic device may include a processor 710 and a memory 720 storing computer program instructions.

[0121] Specifically, the foregoing processor 710 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0122] The memory 720 may include a mass memory for data or instructions. By way of example and not limitation, the memory 720 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive, or a combination of two or more of these. Where appropriate, the memory 720 may include removable or non-removable (or fixed) media. Where appropriate, the memory 720 may be internal or external to the integrated gateway disaster recovery device. In a particular embodiment, the memory 720 is a non-volatile solid-state memory.

[0123] The memory 720 may include a read-only memory (ROM), a random access memory (RAM), a magnetic disk storage media device, an optical storage media device, a flash memory device, an electrical, optical, or other physical / tangible memory storage device. Thus, generally, the memory 720 includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it can perform the operations described in any of the antenna structure optimization design methods in the above embodiments.

[0124] The processor 710 reads and executes the computer program instructions stored in the memory 720 to implement any of the antenna structure optimization design methods in the above embodiments.

[0125] In one example, the electronic device may further include a communication interface 730 and a bus 700. Among them, as Figure 6 shown, the processor 710, the memory 720, and the communication interface 730 are connected through the bus 700 and complete communication with each other.

[0126] The communication interface 730 is mainly used to implement communication between the various modules, devices, units, and / or devices in the embodiments of the present application.

[0127] The bus 700 includes hardware, software, or both, and couples the components of the online data flow metering device to each other. By way of example and not limitation, the bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an InfiniBand interconnect, a Low Pin Count (LPC) bus, a memory bus, a MicroChannel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local (VLB) bus, or other suitable buses, or a combination of two or more of these. Where appropriate, the bus 700 may include one or more buses. Although the embodiments of the present application describe and illustrate specific buses, the present application contemplates any suitable bus or interconnect.

[0128] In addition, in combination with the antenna structure optimization design method in the above embodiments, the embodiments of the present application can be implemented by providing a computer storage medium. Computer program instructions are stored on the computer storage medium; when the computer program instructions are executed by a processor, any one of the antenna structure optimization design methods in the above embodiments is implemented.

[0129] It should be clear that the present application is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications, and additions, or change the order between steps after understanding the spirit of the present application.

[0130] The functional blocks shown in the above block diagrams can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), appropriate firmware, a plug-in, a functional card, and so on. When implemented in software, the elements of the present application are programs or code segments used to perform the required tasks. The program or code segment can be stored in a machine-readable medium or transmitted via a data signal carried in a carrier wave on a transmission medium or a communication link. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, Erasable ROM (EROM), floppy disks, CD-ROMs, optical discs, hard disks, fiber optic media, Radio Frequency (RF) links, and so on. The code segment can be downloaded via a computer network such as the Internet, an intranet, and so on.

[0131] It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, this application is not limited to the order of the above steps. That is to say, the steps can be executed in the order mentioned in the embodiments, or different from the order in the embodiments, or several steps can be executed simultaneously.

[0132] As described above with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems) and computer program products according to embodiments of the present disclosure. It should be understood that each block in the flowchart and / or block diagram, and the combinations of blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine, such that the instructions executed by the processor of the computer or other programmable data processing device enable the implementation of the functions / actions specified in one or more blocks of the flowchart and / or block diagram. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field programmable logic circuit. It should also be understood that each block in the block diagram and / or flowchart, and the combinations of blocks in the block diagram and / or flowchart, can also be implemented by dedicated hardware that performs the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0133] In summary, compared with the prior art, this application has the following beneficial effects:

[0134] 1. An antenna structure optimization design method provided by this application can perform rapid weight optimization of the antenna structure based on the stiffness, strength, and electrical performance of the antenna structure during the service stage, considering the uncertainties of the structural dimensions and material properties. Compared with the conventional design method based on safety factors, this application can achieve a more thorough lightweight design of the phased array antenna structure while ensuring that its stiffness, strength, and electrical performance indicators meet the requirements with high reliability.

[0135] 2. This application provides a convenient, fast, and effective method for the structural optimization design of composite phased array antennas, which can greatly improve the design iteration cycle of the phased antenna structure and significantly reduce the development cost.

[0136] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for optimizing antenna structure design, characterized in that: include: Determine the corresponding structural model according to the structural installation requirements of the composite phased array antenna; Taking the structural strength limit and electrical performance design limit of the composite material phased array antenna as design constraints, determining the design indicators and corresponding reliability requirements of the design constraints, and obtaining the limit state space based on the design constraints; Extracting design parameters of the composite material phased array antenna according to the structural model, wherein the design parameters include deterministic design parameters and random design parameters; Determining noise parameters of the composite phased array antenna that obey random probability distribution, the noise parameters are related to the design constraints and include prepreg ply direction, single-layer prepreg thickness, and antenna unit mounting point position fluctuations on an antenna unit mounting plate; Based on the structural model, the relationship between the design parameters, the noise parameters, the optimization target and the design constraints is established, and a proxy model is established; wherein the optimization target is the structural weight of the composite material phased array antenna; Based on the noise parameters and the optimization target, a reliability optimization model is established with the design parameters as variables and the limit state space as optimization constraints; The structure of the composite material phased array antenna is subjected to reliability optimization design to determine a target solution that satisfies the design constraints and characterizes corresponding design parameters.

2. The antenna structure optimization design method according to claim 1, characterized in that: Determining the corresponding structural model according to the structural installation requirements of the composite material phased array antenna includes: Obtaining structural installation requirements of the composite phased array antenna, the structural installation requirements including installation interfaces and appearance envelopes of multiple stand-alone modules, the multiple stand-alone modules including an antenna unit array, a power chassis, and a transceiver module; Based on the structural installation requirements, determining structural design information of the composite material phased array antenna, the structural design information including external dimensions, composite material structural design, metal embedded parts positions, and structural installation interfaces; The structural model of the composite material phased array antenna is determined according to the structural design information.

3. The antenna structure optimization design method according to claim 1, characterized in that: The design indicators of the structural strength limit include the maximum Mises stress, the maximum shear force of the composite core, the maximum strain and Tsai-Wu coefficient of the composite skin, and the buckling characteristic value of the bar or panel buckling failure; The electrical performance design limit is used to characterize the overall electrical performance of the composite phased array antenna, and the corresponding design indicators include radiation pattern, pointing angle deviation, gain loss and side lobe lift; The deterministic design parameters include: the diameter and length of the composite rod, the thickness and diameter of the antenna unit installation surface; the random design parameters include: the warp tensile modulus that characterizes the mechanical properties of the single-layer carbon fiber cloth , weft tensile modulus , shear modulus and Poisson's ratio ; The prepreg ply direction and the single-layer prepreg thickness are related to the structural rigidity of the composite phased array antenna, and the position fluctuation of the antenna unit mounting point is related to the electrical performance of the composite phased array antenna.

4. The antenna structure optimization design method according to any one of claims 1 to 3, characterized in that: The method of establishing the relationship between the design parameters, the noise parameters, the optimization target and the design constraints based on the structural model, and establishing a proxy model includes: Constructing a corresponding finite element model based on the structural model of the composite material phased array antenna, wherein the structural model is a CAD model; According to the load conditions of the antenna structure corresponding to the finite element model in the service state, a structural stiffness analysis is carried out to obtain strength analysis results and stiffness analysis results; the load conditions include acceleration overload, vibration, and deadweight that characterizes the optimization target; Extracting intensity indicators according to the intensity analysis results to obtain the relationship between the design parameters, the noise parameters and the intensity response; According to the stiffness analysis results, extracting the position vector change of the antenna unit installation point during the service of the phased array antenna; Based on the position vector change, combined with the noise parameter, a comprehensive change of the position vector of the antenna unit installation point is obtained, and a relationship between the design parameter, the noise parameter and electrical performance constraints including phased array antenna gain, sidelobe level and pointing angle deviation is determined; Among them, the electrical performance of the composite material phased array antenna satisfies the expression: In the formula, is the phased array antenna pattern and is used to characterize the electrical performance indicators. is the excitation current loaded to the antenna element, is the radiation pattern of the antenna unit, represents the wave constant, is the wavelength, is the unit polarization vector, is the original position vector of the radiation unit, is the comprehensive change of the radiation unit position vector, is the number of the radiation unit, is the total number of radiating elements.

5. The antenna structure optimization design method according to claim 4, characterized in that: The method of establishing the relationship between the design parameters, the noise parameters, the optimization target and the design constraints based on the structural model, and establishing a proxy model, further includes: Using Latin hypercube sampling method to sample all the design parameters and the noise parameters to select sample points and obtain sampling results; According to the sampling results, a service condition calculation model with different design parameters and noise is established; Calculating all the service condition calculation models to obtain strength response and electrical performance response analysis results under the service conditions; Based on the analysis results of the intensity response and electrical performance response, the design parameters and the corresponding index response values ​​are used as input and output, and a deterministic Kriging proxy model is established by fitting using the Kriging difference technology.

6. The antenna structure optimization design method according to any one of claims 1 to 3, characterized in that: The reliability optimization model satisfies the expression: Where: For deterministic design variables, is the minimum value of the deterministic design variable, is the maximum value of the deterministic design variable; Design variables for randomness; is the noise parameter; is the mean of the random design variable, is the minimum value of the mean of the random design variable, is the maximum value of the mean of the random design variables; is the mean of the noise parameters; Optimizing the function for the target and characterizing the structural weight of the composite phased array antenna; For the The probability constraint function of the strength limit index is is the threshold value of the strength limit index, For the The probability of a strength limit index; For the The probability constraint function of the electrical performance limit index is is the threshold value of the electrical performance limit indicator, For the The probability of reaching the electrical performance limit indicator; and All are positive integers.

7. The antenna structure optimization design method according to any one of claims 1 to 3, characterized in that: The reliability optimization design of the structure of the composite material phased array antenna is performed to determine a target solution that satisfies the design constraints and characterizes corresponding design parameters, including: The reliability optimization design of the design parameters is decomposed into reliability analysis and deterministic optimization by using the SORA method and iterative processing is performed; wherein the reliability analysis is performed by the Monte Carlo method; During the iterative analysis process, the response values ​​corresponding to different design variables in the proxy model are called each time, and it is determined whether the constraint conditions are met, and the solution that meets the constraint conditions is output as the target solution.

8. An antenna structure optimization design system, characterized in that: include: A first determination module is used to determine a corresponding structural model according to the structural installation requirements of the composite material phased array antenna; The second determination module is used to determine the design index and corresponding reliability requirements of the design constraints by taking the structural strength limit and the electrical performance design limit of the composite material phased array antenna as design constraints, and obtain the limit state space based on the design constraints; An extraction module, used for extracting design parameters of the composite material phased array antenna according to the structural model, wherein the design parameters include deterministic design parameters and random design parameters; A third determination module is used to determine noise parameters of the composite phased array antenna that obey random probability distribution, wherein the noise parameters are related to the design constraints and include prepreg ply direction, single-layer prepreg thickness, and antenna unit mounting point position fluctuation on the antenna unit mounting plate; A first establishing module is used to establish the relationship between the design parameters, the noise parameters, the optimization target and the design constraints based on the structural model, and establish a proxy model; wherein the optimization target is the structural weight of the composite material phased array antenna; A second establishing module is used to establish a reliability optimization model based on the noise parameter and the optimization target, taking the design parameter as a variable and taking the limit state space as an optimization constraint; The optimization design module is used to perform reliability optimization design on the structure of the composite material phased array antenna to determine a target solution that meets the design constraints and characterizes corresponding design parameters.

9. An electronic device, characterized in that: include: A processor, a memory, and a program stored in the memory and executable on the processor, wherein when the program is executed by the processor, the antenna structure optimization design method according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a program or instruction, and when the program or instruction is executed by a processor, the antenna structure optimization design method according to any one of claims 1 to 7 is implemented.

Images