Topological optimization design method and system for load-bearing structure of wall-mounted box body

Abstract

The invention discloses a topological optimization design method for a bearing structure of a wall-mounted box, which relates to structural design and comprises the following steps of: determining specification parameters of a box according to a use scene and a purpose of a required bearing structure, and establishing a required maximum envelope model of the box according to the specification parameters; the maximum envelope model of the box body is used as a topological optimization object, and a design domain and a non-design domain of the maximum envelope model are configured to be discrete into finite element models; carrying out topological optimization analysis on the finite element model of the box body by adopting a variable density method; main material layout features are extracted according to the optimization result, so that a box body main force bearing path meeting the machining requirement is determined, and structural model reconstruction is carried out; and on the basis of the reconstructed topological configuration, local strength is checked through structural mechanical simulation analysis, and local structural features are adjusted, so that the overall mechanical property of the box structure meets the requirements. The invention provides a wall-mounted box body structure force bearing optimization checking means, and the performance of the box body structure under the severe working condition is improved.

Description

Technical Field

[0001] The present application relates to the field of structural design, and in particular to a topological optimization design method and system for a wall-mounted box load-bearing structure. Background Art

[0002] Wall-mounted box structures are subject to high vibration and impact conditions, so the design of a reasonable box reinforcement and load-bearing structure is particularly important. Currently, most designs are boxes with uniform wall thickness, or weight is reduced by designing weight-reducing grooves. Most of them do not achieve structural enhancement and lightweight effects at the same time through reinforcement, especially on airborne platforms where most of the equipment is installed on the horizontal platform surface, and the constraint conditions are relatively good.

[0003] Currently, the focus of research on wall-mounted cabinet structures is mainly on the installation scheme of the cabinet in wall-mounted usage scenarios, and rarely involves the cabinet structure itself. Summary of the invention

[0004] The embodiment of the present application provides a topological optimization design method and system for a wall-mounted box load-bearing structure, which adopts a topological optimization method to provide a wall-mounted box structure load-bearing solution through a series of optimization verification means, thereby improving the performance of the box structure under harsh working conditions.

[0005] The present application embodiment provides a topology optimization design method for a wall-mounted box bearing structure, including:

[0006] Determine the specification parameters of the box according to the usage scenario and purpose of the required load-bearing structure, and establish the required maximum envelope model of the box based on the specification parameters;

[0007] The box maximum envelope model is taken as the topology optimization object, and the design domain and non-design domain of the maximum envelope model are discretized into a finite element model;

[0008] The variable density method is used to perform topology optimization analysis on the finite element model of the box;

[0009] Extract the main material layout features based on the optimization results to determine the main load-bearing path of the box that meets the processing requirements and reconstruct the structural model;

[0010] Based on the reconstructed topological configuration, the local strength is checked through structural mechanics simulation analysis, and the local structural characteristics are adjusted to make the overall mechanical properties of the box structure meet the requirements.

[0011] Optionally, the specification parameters of the box body determined according to the usage scenario and purpose of the required load-bearing structure include: the location and size of the box body reinforcement ribs, the overall dimensions, and key interfaces.

[0012] Optionally, the box maximum envelope model is used as a topology optimization object, and the design domain and non-design domain in the box model are discretized into a finite element model, including:

[0013] Configure the input and output interface locations and functional parts of the chassis as non-design domains;

[0014] Configure the rest of the non-interface parts such as the box mounting ears and load-bearing walls as the design domain;

[0015] The design domain and non-design domain in the box model are discretized into finite element models.

[0016] Optionally, the topology optimization analysis of the finite element model of the box using the variable density method includes:

[0017] According to the maximization principle, with the goal of maximizing the first-order natural frequency of the box, the volume and flexibility of the structure are constrained, and a mathematical model is established to meet the following requirements:

[0018]

[0019] Among them, ω j represents the jth order natural frequency; V(x i ) represents the structure volume of the current iteration step; V * Represents the upper limit of the structure volume constraint; V i represents the volume of the i-th unit; x i represents the pseudo density of the i-th unit; C(x i ) represents the structural strain energy of the current iteration step; C * represents the upper limit of the structural strain energy constraint; F represents the load matrix; U represents the overall displacement matrix of the structure; K represents the overall stiffness matrix of the structure; u i represents the displacement matrix of the i-th unit; k i represents the stiffness matrix of the i-th unit; x min Indicates the minimum pseudo density.

[0020] Optionally, topology optimization analysis of the finite element model of the box using the variable density method also includes:

[0021] In x min The material properties are interpolated between 1 and 1 to obtain the gradient information of the design variables. The SIMP interpolation model is used for interpolation calculation. The effect of the unit relative density is used to calculate the structural unit material density ρ i and Young's modulus E i satisfy:

[0022] ρ(x i )=x i ρ0

[0023]

[0024] Among them, 0 <x min ≤x i<1, ρ0 represents the material density used by the unit; E0 represents the Young's modulus used by the unit; p represents the penalty factor (p>1);

[0025] Calculate the sensitivity of the natural frequency function of the box structure to the unit pseudo-density;

[0026] According to the sensitivity solution optimization, the gradient optimization algorithm is selected to perform calculations according to the constraints to obtain the optimization results that meet the constraints.

[0027] Optionally, determine the main load-bearing path of the box that meets the processing requirements and reconstruct the structural model, wherein the reconstruction process fills in auxiliary supporting ribs and reinforced ribs and reserves interfaces for filling materials that meet the sealing and shielding functions according to the material distribution characteristics of the optimization results and the structural design requirements.

[0028] An embodiment of the present application proposes a topology optimization design system for a wall-mounted box load-bearing structure, including a processor and a memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, the steps of the above-mentioned method for topology optimization design of a wall-mounted box load-bearing structure are implemented.

[0029] The embodiment of the present application provides a box structure solution for a wall-mounted scenario, and adopts a topology optimization method to provide a wall-mounted box structure load-bearing solution through a series of optimization and verification means, thereby improving the performance of the box structure under harsh working conditions and solving the load-bearing problem of the box structure itself when hung on the wall.

[0030] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0032] Figure 1 This is a basic flow diagram of the topology optimization design method for the load-bearing structure of a wall-mounted box according to an embodiment of the present application;

[0033] Figure 2 It is a schematic diagram of the optimization results of the topological optimization design method of the wall-mounted box load-bearing structure according to the embodiment of the present application;

[0034] Figure 3It is a schematic diagram of the design results of the topological optimization design method of the wall-mounted box load-bearing structure in the embodiment of the present application. DETAILED DESCRIPTION

[0035] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0036] The wall-mounted box structure of the embodiment of the present application is mainly designed for airborne platforms, which have severe vibration conditions and have extremely high requirements for the rigidity of the main bearing area of ​​the wall-mounted box structure. The topology optimization technology is used and a series of optimization checks are carried out to finally propose a high-bearing box structure design scheme. The embodiment of the present application provides a topology optimization design method for the load-bearing structure of a wall-mounted box, such as Figure 1 As shown, the following steps are included:

[0037] In step S101, the specification parameters of the box are determined according to the use scenario and purpose of the required load-bearing structure, and the required maximum envelope model of the box is established according to the specification parameters. In some embodiments, the specification parameters of the box determined according to the use scenario and purpose of the required load-bearing structure include: the location and size of the box reinforcement ribs, the overall dimensions, and the key interfaces, so as to establish a maximum envelope model of the box that meets the functional and platform requirements.

[0038] In step S102, the maximum envelope model of the box is taken as the topology optimization object, and the design domain and non-design domain in the box topology optimization model are configured to be discretized into a finite element model. The maximum envelope model of the box is taken as the topology optimization object, and the non-design domain and design domain are defined, so that the design domain and non-design domain of the maximum envelope model are discretized into a finite element model.

[0039] In step S103, a variable density method is used to perform topology optimization analysis on the finite element model of the box.

[0040] In step S104, the main optimized material layout features are extracted based on the optimization results to determine the main load-bearing path of the box body that meets the processing requirements and reconstruct the structural model.

[0041] In step S105, based on the reconstructed topological configuration, the local strength is checked through structural mechanics simulation analysis, and the local structural characteristics are adjusted so that the overall mechanical properties of the box structure meet the requirements.

[0042] In some embodiments, the maximum envelope model of the box is used as a topology optimization object, and the design domain and non-design domain in the topology optimization model of the box are configured to be discretized into a finite element model, including:

[0043] Configure the input and output interface locations and functional parts of the chassis as non-design domains;

[0044] Configure the rest of the non-interface parts such as the box mounting ears and load-bearing walls as the design domain;

[0045] The design domain and non-design domain in the box model are discretized into finite element models.

[0046] In some embodiments, performing topology optimization analysis on the finite element model of the box using the variable density method includes:

[0047] According to the maximization principle, with the goal of maximizing the first-order natural frequency of the box, the volume and flexibility of the structure are constrained, and a mathematical model is established to meet the following requirements:

[0048]

[0049] Among them, ω j represents the jth order natural frequency; V(x i ) represents the structure volume of the current iteration step; V * Represents the upper limit of the structure volume constraint; V i represents the volume of the i-th unit; x i represents the pseudo density of the i-th unit; C(x i ) represents the structural strain energy of the current iteration step; C * represents the upper limit of the structural strain energy constraint; F represents the load matrix; U represents the overall displacement matrix of the structure; K represents the overall stiffness matrix of the structure; u i represents the displacement matrix of the i-th unit; k i represents the stiffness matrix of the i-th unit; x min Indicates the minimum pseudo density, 0 and 1 represent no material and solid material respectively.

[0050] In some embodiments, performing topology optimization analysis on the finite element model of the box using the variable density method further includes:

[0051] In x min The material properties are interpolated between 1 and 1 to obtain the gradient information of the design variables. The SIMP interpolation model is used for interpolation calculation. The effect of the unit relative density is used to calculate the structural unit material density ρ i and Young's modulus E i satisfy:

[0052] ρ(x i )=x i ρ0

[0053]

[0054] Among them, 0 <x min ≤x i <1, ρ0 represents the material density used by the unit; E0 represents the Young's modulus used by the unit; p represents the penalty factor (p>1);

[0055] Calculate the sensitivity of the natural frequency function of the box structure to the unit pseudo-density;

[0056] like Figure 2 As shown, according to the sensitivity solution optimization, the gradient optimization algorithm is selected to perform calculation according to the constraints to obtain the optimization result that meets the constraints.

[0057] In some embodiments, the main load-bearing path of the box body that meets the processing requirements is determined and the structural model is reconstructed, wherein the reconstruction process fills the auxiliary support ribs and the reinforced ribs and reserves the interface that meets the sealing and shielding function materials according to the material distribution characteristics of the optimization results and the structural design requirements. Figure 3 As shown, through structural mechanics simulation analysis, the local strength is checked and the local structural characteristics are adjusted so that the mechanical properties of the box structure meet the use requirements and ensure the safety of use, thus completing the design of the wall-mounted box structure.

[0058] The embodiment of the present application provides a box structure solution for a wall-mounted scenario, and adopts a topology optimization method to provide a wall-mounted box structure load-bearing solution through a series of optimization and verification means, thereby improving the performance of the box structure under harsh working conditions. Compared with the existing wall-mounted equipment, it has more superior load-bearing performance while meeting the requirements of lightweight and functionality, and can meet harsh environmental requirements, solving the load-bearing problem of the box structure itself when hung on the wall.

[0059] An embodiment of the present application proposes a topology optimization design system for a wall-mounted box load-bearing structure, including a processor and a memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, the steps of the above-mentioned method for topology optimization design of a wall-mounted box load-bearing structure are implemented.

[0060] It should be noted that in the various embodiments of the present application, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0061] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0062] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for a terminal (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0063] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A topological optimization design method for a wall-mounted box bearing structure, characterized in that: include: Determine the specification parameters of the box according to the usage scenario and purpose of the required load-bearing structure, and establish the required maximum envelope model of the box based on the specification parameters; The box maximum envelope model is taken as the topology optimization object, and the design domain and non-design domain in the maximum envelope model are discretized into a finite element model; The variable density method is used to perform topology optimization analysis on the finite element model of the box; Extract the main material layout features based on the optimization results to determine the main load-bearing path of the box that meets the processing requirements and reconstruct the structural model; Based on the reconstructed topological configuration, the local strength is checked through structural mechanics simulation analysis, and the local structural characteristics are adjusted to make the overall mechanical properties of the box structure meet the requirements.

2. The topological optimization design method for the load-bearing structure of a wall-mounted box according to claim 1, characterized in that: The specification parameters of the box body determined according to the usage scenario and purpose of the required load-bearing structure include: the location and size of the box body reinforcement ribs, the overall dimensions, and key interfaces.

3. The topological optimization design method for the load-bearing structure of a wall-mounted box according to claim 1, characterized in that: The maximum envelope model of the box is used as the topology optimization object, and the design domain and non-design domain in the box model are discretized into finite element models, including: Configure the input and output interface locations and functional parts of the chassis as non-design domains; Configure the box mounting ears, load-bearing wall and other non-interface parts as the design domain; The design domain and non-design domain in the box model are discretized into finite element models.

4. The topological optimization design method for the load-bearing structure of a wall-mounted box as claimed in claim 3, characterized in that: The topology optimization analysis of the finite element model of the box using the variable density method includes: According to the maximization principle, with the goal of maximizing the first-order natural frequency of the box, the volume and flexibility of the structure are constrained, and a mathematical model is established to meet the following requirements: find:x i ={x min ,1} Maximize:ω j Among them, ω j represents the jth order natural frequency; V(x i ) represents the structure volume of the current iteration step; V * Represents the upper limit of the structure volume constraint; V i represents the volume of the i-th unit; x i represents the pseudo density of the i-th unit; C(x i ) represents the structural strain energy of the current iteration step; C * represents the upper limit of the structural strain energy constraint; F represents the load matrix; U represents the overall displacement matrix of the structure; K represents the overall stiffness matrix of the structure; u i represents the displacement matrix of the i-th unit; k i represents the stiffness matrix of the i-th unit; x min Indicates the minimum pseudo density.

5. The topological optimization design method for the load-bearing structure of a wall-mounted box as claimed in claim 4, characterized in that: The topology optimization analysis of the finite element model of the box using the variable density method also includes: In x min The material properties are interpolated between 1 and 1 to obtain the gradient information of the design variables. The SIMP interpolation model is used for interpolation calculation. The effect of the unit relative density is used to calculate the structural unit material density ρ i and Young's modulus E i satisfy: p(x i )=x i p0 Among them, 0 <x min ≤x i <1, ρ0 represents the material density used by the unit; E0 represents the Young's modulus used by the unit; p represents the penalty factor (p>1); Calculate the sensitivity of the natural frequency function of the box structure to the unit pseudo-density; According to the sensitivity solution optimization, the gradient optimization algorithm is selected to perform calculations according to the constraints to obtain the optimization results that meet the constraints.

6. The topological optimization design method for the load-bearing structure of a wall-mounted box according to claim 4, characterized in that: The main load-bearing path of the box that meets the processing requirements is determined and the structural model is reconstructed. During the reconstruction process, auxiliary supports and reinforced ribs are filled and interfaces with reserved materials that meet the sealing and shielding functions are filled according to the material distribution characteristics of the optimization results and the structural design requirements.

7. A topological optimization design system for a wall-mounted box bearing structure, characterized in that: It comprises a processor and a memory, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the steps of the topological optimization design method of the wall-mounted box load-bearing structure as described in any one of claims 1 to 6 are implemented.

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