Parametric finite element analysis of a phased arr

Parametric finite element analysis of a phased array radar based on VC

1 preface

transceiver full DBF two-dimensional phased array radar structure is a digital active phased array radar system based on the design idea of receive/transmit full DBF. It not only has all the excellent performances of conventional phased array radar, but also has greater beam forming flexibility, better anti active jamming and clutter performance, and effectively reduces the cost of the whole life cycle Improving the reliability and maintainability of radar system is the development direction of radar technology in the future

according to the overall requirements of phased array radar for structural system, the radar antenna should realize rapid erection, decomposability, rapid module replacement and reassembly, miniaturization, rapid and flexible erection and scalability. Based on these requirements, a reconfigurable and expandable general standard modular antenna unit (dau) is used in a radar antenna structure, which is assembled by m-layer and n-column daus. So that the radar system designer can realize the high-performance radar system that meets the war technical index through the simple combination of these units

2 parametric finite element structural analysis

in the assembled radar antenna structure, the load deformation of the assembled laminated structure is an important factor affecting the accuracy of the antenna reflector. In the early stage of design, a variety of structural schemes need to be considered. After preliminary analysis and comparison, the most reasonable design scheme is selected

the antenna structure of a digital radar array introduced in this paper, the overall structural form of the antenna unit has been relatively fixed, but the difference is that some structural dimensions and unit arrangement forms are different. These differences are the main content of the radar structure analysis. If the traditional finite element analysis method is adopted, the process of "design modeling one memory cotton bus seat made of MDI (2 phenylmethane 2 isocyanate) will bring more comfortable driving experience to passengers" will be repeated, which will cause a lot of repetitive work in finite element modeling and processing results, affecting the efficiency of design analysis

in order to overcome the problems caused by the above repeated modeling and analysis, in the process of finite element modeling and analysis, the idea of structural parametric design is introduced, and the parametric modeling method is used to replace the dau unit size, so that for products with different structural sizes, the corresponding antenna unit calculation model can be obtained automatically and quickly by changing the value of the corresponding parametric size, eliminating a large number of repeated processes, The efficiency of design analysis is improved

in this paper, the parametric modeling of the antenna element, the application of parametric load and the solution, and the display of parametric post-processing results are realized by using the a PDL (ANSYS parametric design language) language of the finite element analysis software ANSYS, so as to realize the whole process of parametric finite element analysis

3 use VC programming to package the parametric analysis of ANSYS

use APDL of ANSYS to carry out parametric finite element analysis of antenna unit, which can flexibly control the geometric model of analysis and reduce the workload of analysis. However, due to the inherent limitations of APDL language, the readability, maintainability and expansibility of the developed program are poor. Moreover, this analysis cannot provide graphical interface input, and it is not intuitive and convenient to modify the relevant size or arrangement of the antenna unit structure. Therefore, we use the object-oriented programming language VC to expand and package the APDL analysis program, design a convenient graphical parameter input interface, and use the powerful and convenient functions of VC language to complete the establishment of complex models. The equipment is equipped with six groups of sample detection power universal sockets, and the sample power supply is independent of the equipment power supply. In addition, we connect APDL language to automatically complete the whole process of analysis, and get the calculation results of this series of structures

the first step of program design is to use the above ANSYS to establish the parametric APDL code of the analysis model, and program in VC according to the parametric a PDL code of the model. The running process of the program is shown in Figure 1. The experimental space 1 is 600 (3) 000mm (customized according to the pipe diameter). The functions that the program needs to realize are: ① model parameters are input through the dialog box; ② Automatically form the corresponding a PDL command text according to the input parameters; ③ The program can automatically call ANSYS and execute APDL command text; ④ The analysis result file can be viewed directly in the program. The flow of the program is shown in Figure 1

Figure 1 program running flow chart

to start the application program ANSYS interface technology in VC, there are many functions that can be used, such as the use steps of W metallographic microscope and the calibration steps of the equipment. Related introductions include inexec, shellexecute and CreateProcess functions. CreateProcess function creates a process to execute other programs. It can specify the security attributes, inheritance information and class priority of the process. Therefore, select CreateProcess function to start VC, Its function prototype is as follows:

bool CreateProcess (

lpctstr lpapplicationname,//executable module name

lptstr lpcommandline,//command line string

lpsecurity_attributes lpprocessattributes,//security attributes of the process

lpsecurity_attributes lpthreadattributes,//security attributes of the process

bool binherithandles,//handle inheritance flags

dword dwcreationflags,//create flags

lpvoid lpenvironment,//points to the new environment block Pointer

lpctstr lpcurrentDirectory,//pointer to the current directory name

lpstartupinfo,//pointer to the startup information structure

lpprocess_ Information lpprocessinformation//pointer to the process information structure

)

when the program is running, input parameters first, and the interface is shown in Figure 2. Among them, the material parameters field, the assembly parameters field and the structure parameters field are used to modify the material, the structural parameters of a single dau, and the number of dau assembly layers and columns. Work options is used to set the working directory, working name, etc. when starting the ANSYS batch process for analysis. After completing parameter input and selection, the program automatically generates a PDL code. Click the start ANSYS batch menu item, start the ANSYS batch, automatically run the a PDL batch command file of ANSYS in the background, and complete the finite element analysis and calculation of a series of dau assembly. Click the corresponding button to directly calculate the results, as shown in Figure 3 and Figure 4

Figure 2 parameter input and selection dialog box

Figure 3 displacement nephogram

Figure 4 stress nephogram

4 conclusion and outlook

this paper uses VC to carry out secondary development of pre-processing and post-processing of ANSYS. With the help of the powerful function of VC language and APDL parametric language, modeling, loading and analysis can be completed automatically by simply inputting and selecting parameters. In this way, the specific programming of ANSYS is encapsulated, so that the special program has good interactivity, especially the functions of parameter optimization, cad/cae and visual pre and post-processing can be easily embedded, so that engineers do not have to consider the specific content of the finite element analysis program when carrying out finite element analysis. It provides a new method and way for engineers to carry out structural design and analysis in the future. (end)