Zero-rudder-deflection-based different-rudder-deflection combined hybrid grid automatic generation method

Abstract

The invention belongs to the field of missile aerodynamics, and particularly relates to a zero-rudder-deflection-based hybrid grid automatic generation method for different rudder deflection combinations, which comprises the following steps of: firstly, sequentially generating geometric models under different rudder deflection combinations by adopting a traditional method on the basis of a simplified aerodynamic configuration of a certain missile; grid generation software is imported to generate hybrid grids under different rudder deflection combinations; then, on the basis of the zero-rudder-deflection hybrid grid, a self-compiled script program is adopted, automatic rotation of a rudder surface grid and automatic generation of a space hybrid grid are achieved, and then hybrid grids under different rudder deflection combinations are obtained; by comparing the time required by the two methods, it is proved that the automatic hybrid grid generation technology is simple in operation and shorter in consumed time, and an operation interface is written for the method so as to achieve full-process automatic generation of different rudder deflection combination script programs, hybrid grid generation, numerical calculation input files and the like. And a technology for automatically generating different rudder deflection combination hybrid grids based on zero rudder deflection is formed.

Description

Technical Field

[0001] This invention belongs to the field of missile aerodynamics, specifically relating to an automatic generation method for hybrid grids of different rudder deflection combinations based on zero rudder deflection. Technical Background

[0002] As smart munitions evolve towards automation and intelligence, the demands for automation and intelligence in the R&D and design process are constantly increasing. Furthermore, the iterative iterations and validations of aerodynamic shapes during the feasibility study phase place even higher demands on each iteration cycle. The rapid acquisition of aerodynamic data presupposes the rapid generation of the shape calculation mesh. Developing automated mesh generation programs can effectively shorten project iteration cycles and improve the automation level and efficiency of aerodynamic shape design, which is also a crucial means to gain the initiative in the current fiercely competitive environment.

[0003] PointWise is one of the most widely used commercial mesh generation software programs both domestically and internationally, and is widely used in universities and aerospace research institutes in China. As a professional CFD preprocessing mesh generation software, PointWise has powerful mesh generation capabilities and functions, which can meet the CFD analysis needs and standards of different fields and industries; it has a user-friendly interface and interactive methods, which can facilitate users to operate and control mesh generation; it has good mesh generation compatibility and scalability, and can seamlessly exchange data and interface with various CAD software and CFD software.

[0004] Currently, for domestic missile and rocket projects requiring hundreds of meshes in each iteration, the following shortcomings exist when technicians use PointWise software: 1. For each rudder deflection condition, technicians need to rotate the geometric model and rudder surface mesh in PointWise software and then regenerate the spatial mesh, which is cumbersome and unacceptable for hundreds of meshes; 2. PointWise supports the Glyph2 scripting language to automate mesh generation, but technicians need to write mesh generation programs and commands, which requires a high level of skill from the technicians.

[0005] Given that PointWise supports scripting language compilation, it is of great significance to write programs to automatically generate hybrid meshes with different rudder deflection combinations based on zero rudder deflection hybrid meshes, thereby simplifying the user threshold for technicians, improving the automation level and efficiency of mesh generation, reducing time costs and human error, and shortening the project iteration cycle. Summary of the Invention

[0006] (a) Technical problems to be solved

[0007] The technical problem to be solved by this invention is: how to provide an automatic generation method for hybrid meshes of different rudder deflection combinations based on zero rudder deflection. The process of automatic generation method for hybrid meshes of different rudder deflection combinations based on zero rudder deflection is sorted out, and a GUI interface is written based on MATLAB to form a practical device, which provides a reference for the automatic generation of hybrid meshes of different rudder deflection combinations in engineering.

[0008] (2) Technical solution

[0009] To address the aforementioned technical problems, this invention provides an automatic method for generating hybrid meshes of different rudder deflection combinations based on zero rudder deflection, the method comprising the following steps:

[0010] Step 1: Based on the original projectile shape, simplify the model in CAE modeling software to obtain a zero-rudder-off geometry model;

[0011] Step 2: For the zero rudder deflection geometric model, perform rudder surface rotation operation in CAE modeling software to obtain geometric models under different rudder deflection combinations. Then, import the geometric models of different rudder deflection combinations into the mesh generation software in sequence to obtain the hybrid mesh under different rudder deflection combinations.

[0012] Step 3: Import the zero rudder deflection geometry model into the mesh generation software to obtain a zero rudder deflection hybrid mesh. Then, use a script program to automatically rotate the rudder surface mesh in the mesh generation software to obtain a hybrid mesh under the corresponding rudder deflection combination. Repeat the above operation to obtain hybrid meshes under different rudder deflection combinations.

[0013] Step 4: Compare and analyze the time required for different rudder deflection hybrid meshes obtained in Step 2 and Step 3, determine the optimal method for generating hybrid meshes with different rudder deflection combinations, develop a GUI operation interface, integrate and simplify the operation process, and realize the automatic generation of hybrid meshes with different rudder deflection combinations based on zero rudder deflection.

[0014] In step one, the model is simplified as follows:

[0015] For components on the missile body surface that have a small impact on aerodynamic calculation results but seriously affect mesh quality, simplification is performed, while cone sections and rudder components are not simplified.

[0016] The CAE modeling software used is UG, SolidWorks, or CATIA.

[0017] In step three, the mesh generation software used is PointWise.

[0018] In step three, the script is written using the Glyph2 scripting language supported by PointWise.

[0019] In step four, the GUI operation interface is written in MATLAB. The GUI interface integrates and realizes the automatic generation of scripts for different rudder deflection combinations, hybrid mesh generation, and numerical calculation input files.

[0020] (III) Technical Effects

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] (1) An innovative automated hybrid mesh generation technology is proposed. By comparing the traditional hybrid mesh generation method with the method of calling the self-written script, it is confirmed that the automated hybrid mesh generation method is simple to operate and takes less time. It greatly simplifies the hybrid mesh generation process with different rudder deflection combinations, improves the mesh generation efficiency, and has great application potential in engineering project development.

[0023] (2) The present invention uses MATLAB to write a GUI operation interface for the above-mentioned automated hybrid mesh generation technology, and realizes an automatic generation device for hybrid mesh based on zero rudder deflection and different rudder deflection combinations, which provides convenience for engineering technicians. Attached Figure Description

[0024] Figure 1 Flowchart of an automatic method and device for generating hybrid meshes with different rudder deflection combinations based on zero rudder deflection.

[0025] Figure 2 Detailed flowchart of traditional method for generating mixed meshes with different rudder deflection combinations.

[0026] Figure 3 Comparison of time consumption between traditional and automated methods for generating hybrid meshes with different rudder deflection combinations.

[0027] Figure 4 A GUI interface is automatically generated based on a hybrid mesh of different rudder deflection combinations with zero rudder deflection.

[0028] Figure 5 During the process of automatically generating mixed meshes with different rudder deflection combinations through the GUI operation interface, the background calls PointWise to generate screenshots of the mixed meshes. Detailed Implementation

[0029] To address the aforementioned technical problems, this invention provides an automatic method for generating hybrid meshes of different rudder deflection combinations based on zero rudder deflection, the method comprising the following steps:

[0030] Step 1: Based on the original projectile shape, simplify the model in CAE modeling software to obtain a zero-rudder-off geometry model;

[0031] Step 2: For the zero rudder deflection geometric model, perform rudder surface rotation operation in CAE modeling software to obtain geometric models under different rudder deflection combinations. Then, import the geometric models of different rudder deflection combinations into the mesh generation software in sequence to obtain the hybrid mesh under different rudder deflection combinations.

[0032] Step 3: Import the zero rudder deflection geometry model into the mesh generation software to obtain a zero rudder deflection hybrid mesh. Then, use a script program to automatically rotate the rudder surface mesh in the mesh generation software to obtain a hybrid mesh under the corresponding rudder deflection combination. Repeat the above operation to obtain hybrid meshes under different rudder deflection combinations.

[0033] Step 4: Compare and analyze the time required for different rudder deflection hybrid meshes obtained in Step 2 and Step 3, determine the optimal method for generating hybrid meshes with different rudder deflection combinations, develop a GUI operation interface, integrate and simplify the operation process, and realize the automatic generation of hybrid meshes with different rudder deflection combinations based on zero rudder deflection.

[0034] In step one, the model is simplified as follows:

[0035] For components on the missile body surface that have a small impact on aerodynamic calculation results but seriously affect mesh quality, simplification is performed, while cone sections and rudder components are not simplified.

[0036] The CAE modeling software used is UG, SolidWorks, or CATIA.

[0037] In step three, the mesh generation software used is PointWise.

[0038] In step three, the script is written using the Glyph2 scripting language supported by PointWise.

[0039] In step four, the GUI operation interface is written in MATLAB. The GUI interface integrates and realizes the automatic generation of scripts for different rudder deflection combinations, hybrid mesh generation, and numerical calculation input files.

[0040] Example 1

[0041] The following detailed description of the automatic generation method and apparatus for hybrid meshes based on different rudder deflection combinations with zero rudder deflection, in conjunction with engineering examples and accompanying drawings, further illustrates this invention. Figure 1 As shown, the specific implementation steps of the automatic generation method and device for hybrid meshes with different rudder deflection combinations based on zero rudder deflection are as follows:

[0042] First, the shape of a missile is simplified based on its shape. Generally, it is necessary to fill the screw holes on the surface of the missile body and the gaps between different sections, and to grind down the protruding screws and the minor steps between different sections. The main lift and drag components, such as the rudder wings, other than the missile body should not be simplified as much as possible. The CAE software used for modeling can be UG, SolidWorks, or CATIA.

[0043] To address the traditional method of generating hybrid meshes for different rudder deflection combinations, the simplified zero-rudder-deflection projectile model described above is imported into the mesh generation software PointWise to sequentially generate the projectile surface mesh, boundary layer mesh, and spatial mesh. For different rudder deflection combinations, after modifying the geometric model, the above steps are repeated to obtain the hybrid mesh for the corresponding rudder deflection combination. The detailed process is as follows: Figure 2 As shown.

[0044] For the automated generation of hybrid meshes with different rudder deflection combinations, the zero-rudder deflection hybrid mesh is still generated using traditional methods. For different rudder deflection combinations, based on the zero-rudder deflection hybrid mesh, a program is written using the Glyph2 scripting language supported by PointWise to automatically rotate the rudder surface mesh, automatically generate boundary layers and spatial meshes, and automatically export mesh and calculation files. The corresponding process is as follows: Figure 1 As shown.

[0045] A detailed comparative analysis of the time consumption of the two mesh generation methods is provided below, taking the completion of 50 sets of aerodynamic databases with different rudder deflections as an example:

[0046] Traditional hybrid mesh generation method: The first set of rudder-free meshes (with completed geometric model modifications) takes a relatively long time, estimated at 3 hours. Afterwards, meshes for different rudder deflection conditions require manual rotation of the rudder surface mesh and spatial hybrid mesh generation, estimated at 1 hour. The total time for generating 50 sets of hybrid meshes for different rudder deflection conditions is 3×1 + 1×49 = 52 hours.

[0047] Automated hybrid mesh generation method: The zero rudder deflection hybrid mesh example is calculated in 3 hours. Afterwards, meshes under different rudder deflection conditions only require reading the automatic mesh generation program, which takes only 0.4 hours to complete. The total time for generating 50 sets of hybrid meshes with different rudder deflections is 3×1 + 0.4×49 = 22.6 hours.

[0048] Therefore, this method can reduce the time required to generate 50 sets of meshes for each iteration of an engineering project by approximately 56% (52-22.6) / 52, as shown in the following figure. Figure 3 As shown, this greatly improves the automation level and efficiency of grid generation, and can reduce errors caused by human operation.

[0049] Ultimately, considering that the automated hybrid mesh generation method is less time-consuming, a GUI interface was developed using MATLAB to integrate and automate the entire process, including scripts for different rudder deflection combinations, hybrid mesh generation, and numerical calculation input files. The corresponding GUI interface is shown below. Figure 4 As shown. The information that needs to be imported in the GUI operation interface includes: (1) the storage path of all output files; (2) the zero rudder deflection rudder surface mesh script information; (3) the zero rudder deflection spatial mesh script information; (4) the number of rudder surface rotations; (5) the rudder deflection angle corresponding to each rudder under all rudder deflection combinations; (6) the installation location of the mesh generation software PointWise, so that mixed mesh generation can be performed through background calls without opening the mesh generation software; (7) finally generating all the required rudder deflection mesh files and calculation files, and the corresponding file results are as follows. Figure 5 As shown, this enables the automatic generation of hybrid meshes based on different rudder deflection combinations with zero rudder deflection.

[0050] In summary, this invention belongs to the field of missile aerodynamics, specifically relating to an automatic method for generating hybrid meshes of different rudder deflection combinations based on zero rudder deflection. Based on a simplified aerodynamic shape of a missile, the invention first uses traditional methods to sequentially generate geometric models under different rudder deflection combinations, and then imports these models into mesh generation software to generate hybrid meshes for each combination. Subsequently, based on the zero-rudder deflection hybrid mesh, a self-written script program is used to automatically rotate the rudder surface mesh and automatically generate the spatial hybrid mesh, thus obtaining the hybrid meshes for different rudder deflection combinations. By comparing the time required by the two methods, it is confirmed that the automated hybrid mesh generation technology is simpler to operate and less time-consuming. An interface has been developed for this method to automate the entire process, including scripting different rudder deflection combinations, hybrid mesh generation, and numerical calculation input files, forming an automatic generation technology for hybrid meshes of different rudder deflection combinations based on zero rudder deflection. This invention solves the problem of rapid and automated generation of large quantities of hybrid meshes of different rudder deflection combinations during the engineering project development stage, outlines the automatic generation method process for hybrid meshes of different rudder deflection combinations based on zero rudder deflection, and develops an automated interface to realize an automatic generation device for hybrid meshes of different rudder deflection combinations based on zero rudder deflection, providing convenience for subsequent engineering applications.

[0051] In summary, the present invention demonstrates that the method and apparatus for automatically generating hybrid meshes using different rudder deflection combinations based on zero rudder deflection are simple to operate and time-efficient, significantly improving mesh generation efficiency. The specific implementation methods described above are limited to explaining and illustrating the technical solutions of the present invention, and do not constitute a limitation on the scope of protection of the claims. Those skilled in the art should understand that any new technical solutions obtained by making simple modifications or substitutions based on the technical solutions of the present invention fall within the protection scope of the present invention.

Claims

1. A method for automatically generating hybrid meshes of different rudder deflection combinations based on zero rudder deflection, characterized in that, The method includes the following steps: Step 1: Based on the original projectile shape, simplify the model in CAE modeling software to obtain a zero-rudder-off geometry model; Step 2: For the zero rudder deflection geometric model, perform rudder surface rotation operation in CAE modeling software to obtain geometric models under different rudder deflection combinations. Then, import the geometric models of different rudder deflection combinations into the mesh generation software in sequence to obtain the hybrid mesh under different rudder deflection combinations. Step 3: Import the zero rudder deflection geometry model into the mesh generation software to obtain a zero rudder deflection hybrid mesh. Then, use a script program to automatically rotate the rudder surface mesh in the mesh generation software to obtain a hybrid mesh under the corresponding rudder deflection combination. Repeat the above operation to obtain hybrid meshes under different rudder deflection combinations. Step 4: Compare and analyze the time required for different rudder deflection hybrid meshes obtained in Step 2 and Step 3, determine the optimal method for generating hybrid meshes with different rudder deflection combinations, develop a GUI operation interface, integrate and simplify the operation process, and realize the automatic generation of hybrid meshes with different rudder deflection combinations based on zero rudder deflection.

2. The automatic generation method for hybrid meshes of different rudder deflection combinations based on zero rudder deflection as described in claim 1, characterized in that, In step one, the model is simplified as follows: For components on the missile body surface that have a small impact on aerodynamic calculation results but seriously affect mesh quality, simplification is performed, while cone sections and rudder components are not simplified.

3. The automatic generation method for hybrid meshes of different rudder deflection combinations based on zero rudder deflection as described in claim 1, characterized in that, The CAE modeling software used is UG, SolidWorks, or CATIA.

4. The automatic generation method for hybrid meshes of different rudder deflection combinations based on zero rudder deflection as described in claim 1, characterized in that, In step three, the mesh generation software used is PointWise.

5. The automatic generation method for hybrid meshes of different rudder deflection combinations based on zero rudder deflection as described in claim 1, characterized in that, In step three, the script program is written using the Glyph2 scripting language supported by PointWise.

6. The automatic generation method for hybrid meshes of different rudder deflection combinations based on zero rudder deflection as described in claim 1, characterized in that, In step four, the GUI operation interface is written in MATLAB. The GUI interface integrates and realizes the automatic generation of scripts for different rudder deflection combinations, hybrid mesh generation, and numerical calculation input files.

7. The automatic generation method for hybrid meshes of different rudder deflection combinations based on zero rudder deflection as described in claim 1, characterized in that, The method, by comparing the traditional method of generating mixed meshes with different rudder deflection combinations and the method of generating meshes automatically by calling scripts, proves that the automated mixed mesh generation method is simple to operate and takes less time. It greatly simplifies the process of generating mixed meshes with different rudder deflection combinations, improves the efficiency of mesh generation, and has great application potential in engineering project development.

8. The automatic generation method for hybrid meshes of different rudder deflection combinations based on zero rudder deflection as described in claim 1, characterized in that, The method utilizes a GUI interface developed using MATLAB to automate the hybrid mesh generation technology, enabling the automatic generation of hybrid meshes based on different rudder deflection combinations with zero rudder deflection, thus providing convenience for engineering technicians.

9. The automatic generation method for hybrid meshes of different rudder deflection combinations based on zero rudder deflection as described in claim 1, characterized in that, The method outlines the process for automatically generating hybrid meshes with different rudder deflection combinations based on zero rudder deflection, and develops a GUI interface based on MATLAB to form a practical solution, providing a reference for the automated generation of hybrid meshes with different rudder deflection combinations in engineering.

10. The automatic generation method for hybrid meshes of different rudder deflection combinations based on zero rudder deflection as described in claim 1, characterized in that, The method described belongs to the field of missile aerodynamics.

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