阅读说明：本技术 一种环形薄壁支撑结构优化设计方法 (Optimization design method for annular thin-wall supporting structure ) 是由 石凯飞 段馨蕊 于 2020-04-30 设计创作，主要内容包括：本发明的一种环形薄壁支撑结构的优化设计方法,由建立模型,导入模型,网格划分,设置材料属性,得到粗略优化模型,模型细化修改,强度验证步骤组成,本发明从优化结果来看,在结构强度允许的条件下,优化结构模型与原模型相比,节省了材料,结构更加合理,此结构构件设计,不仅开辟了结构设计新思路,而且设计出的产品可以与增材制造方法相结合,实现结构的快速制造。(The invention relates to an optimization design method of an annular thin-wall supporting structure, which comprises the steps of establishing a model, introducing the model, dividing grids, setting material attributes, obtaining a rough optimization model, refining and modifying the model and verifying the strength.)

1. An optimal design method of an annular thin-wall supporting structure is characterized by comprising the following steps:

1) establishing a model: establishing an analysis model by adopting Pro/e according to a two-dimensional drawing;

2) importing a model: importing an analysis model into Ansys Workbench;

3) grid division: an Ansys system is adopted to divide the grids of the model, so that the quality of the grids reaches a better level;

4) setting material properties: designing boundary conditions such as material properties and loads of the model, and obtaining equivalent stress and total deformation values of the model through computer analysis;

5) obtaining a rough optimization model: importing the data into a topology optimization module, setting analysis parameters, an optimization area and an optimization proportion, and obtaining an optimized approximate topological structure, wherein the optimization target is quality minimization;

6) model refinement and modification: leading the model into an optimization verification module, particularly into a spacclaim module, removing redundant lines in a sketch mode, connecting broken line segments, repairing the model lines, and stretching to obtain an optimized final model;

7) and (3) strength verification: repeating the steps 2) to 4), obtaining an equivalent strength value and a deformation value of the optimized model, and verifying the rationality of the structural optimization;

8) and (5) drawing a conclusion that: the modified structure greatly reduces the mass and has more reasonable stress.

2. The method of claim 1, wherein the optimization design method is continuum topology optimization.

3. The method for optimally designing the annular thin-walled support structure according to claim 1, wherein the material property of the design model in the step 4 is structural steel.

Technical Field

The invention relates to the technical field of annular thin walls, in particular to an optimal design method of an annular thin-wall supporting structure.

Background

Most of the supporting structures of the annular thin wall lack accurate design and calculation in the previous product design, and the product design in the similar field generally has higher requirements on light weight and structural reasonability; therefore, research on optimization methods for designing the composite material is necessary.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides an annular thin-wall support structure optimization design method.

In order to achieve the purpose, the invention adopts the following technical scheme:

an optimal design method of an annular thin-wall supporting structure comprises the following steps:

1) establishing a model: establishing an analysis model by adopting Pro/e according to a two-dimensional drawing;

2) importing a model: importing an analysis model into Ansys Workbench;

3) grid division: an Ansys system is adopted to divide the grids of the model, so that the quality of the grids reaches a better level;

4) setting material properties: designing boundary conditions such as material properties and loads of the model, and obtaining equivalent stress and total deformation values of the model through computer analysis;

5) obtaining a rough optimization model: importing the data into a topology optimization module, setting analysis parameters, an optimization area and an optimization proportion, and obtaining an optimized approximate topological structure, wherein the optimization target is quality minimization;

6) model refinement and modification: leading the model into an optimization verification module, particularly into a spacclaim module, removing redundant lines in a sketch mode, connecting broken line segments, repairing the model lines, and stretching to obtain an optimized final model;

7) and (3) strength verification: repeating the steps 2) to 4), obtaining an equivalent strength value and a deformation value of the optimized model, and verifying the rationality of the structural optimization;

8) and (5) drawing a conclusion that: the modified structure greatly reduces the mass and has more reasonable stress.

Preferably, the optimization design method is continuum topology optimization.

Preferably, the material property of the design model in the step 4 is structural steel.

According to the invention, the optimized design method of the annular thin-wall supporting structure saves materials, the structure is more reasonable, the structural member design not only opens up a new structural design idea, but also the designed product can be combined with an additive manufacturing method to realize the rapid manufacturing of the structure.

Drawings

FIG. 1 is a diagram of an unoptimized pre-model;

FIG. 2 is a deformed cloud of an unoptimized model;

FIG. 3 is a cloud of model stresses before optimization;

FIG. 4 is a diagram of a topology optimization preliminary model;

FIG. 5 is a diagram of the model after refinement;

FIG. 6 is a deformation cloud of the optimized model;

FIG. 7 is a stress cloud of the optimized model.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Referring to fig. 1-7, an optimized design method for an annular thin-wall support structure includes the following steps:

1) establishing a model: establishing an analysis model by adopting Pro/e according to a two-dimensional drawing;

2) importing a model: importing an analysis model into Ansys Workbench;

3) grid division: adopting an Ansys system to divide the model into grids, preferably adopting a hex division method, setting the grid size to be 50mm, and adopting a surface grid division method to enable the grid quality to reach 0.9;

4) setting material properties: the material attribute of the design model is structural steel, six local coordinate systems are established for adding loads, and specific positions correspond to six circumferential force positions, so that boundary conditions are applied. Obtaining the equivalent stress and the total deformation value through computer analysis;

5) obtaining a rough optimization model: and importing the data into a topology optimization module, wherein the analysis type is OpitimizionCritieria, the optimization area is a disc area, and the inner circle and the outer circle are reserved areas. The retained mass was set at 40%. The optimization objective is mass minimization. Thereby obtaining an optimized approximate topological structure;

6) model refinement and modification: leading the model into an optimization verification module, particularly into a spacclaim module, firstly entering a sketch mode, framing contour lines, removing redundant lines by using Trimaway, connecting broken lines by using Line, and then stretching the model by using pull commands;

7) and (3) strength verification: repeating the steps 2) to 4), obtaining an equivalent strength value and a deformation value of the optimized model, and verifying the rationality of the structural optimization;

8) and (5) drawing a conclusion that: the modified structure greatly reduces the mass, the mass is 40 percent of the original mass, and the structural mechanical index strength and rigidity values are all in an allowable range;

in the invention, the optimization design method is continuum topology optimization.

In the present invention, the material property of the design model in step 4 is structural steel.

In the invention, the optimization design method is continuum topology optimization, and from the optimization result, compared with the original model, the optimization structure saves materials and is more reasonable in structure under the condition that the structural strength allows, and the novel structure configuration design is realized by setting an optimization region, a non-optimization region, an optimization target, optimization constraint, manufacturing constraint and other methods for an optimization entity in the realization process, so that a new idea for developing the structure design is brought to people, and the method can be combined with an additive manufacturing method to realize the rapid manufacturing of the structure.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.