| Microwave Vacuum Devices have been played an very important role in the aerospace, military and other cutting-edge technology fields for its significant characteristics, such as high power, high gain. Due to the advantages, such as wide band, high gain, long service life and high reliability and so on, traveling wave tube(TWT) is most widely used at present as one of them. In recent years, with the continuous development of our country’s space technology and other cutting-edge technology, the demand for TWT is also gradually increase. However, there are a lot of differences between domestic and imported traveling wave tube. The domestic products can’t meet the requirements yet on the performance indicators and reliability requirements.The traveling wave tube’s structure is complex, and its design and manufacture related to electromagnetics, thermal, mechanical and other fields. Due to its special purpose, this product can only batch production. its cost is high and can’t to do physical testing for many new structure. Computer aided design(CAD) has been become an essential part of in the design of traveling wave tube, and the traveling wave tube CAD simulation software has also been become a very important tool in the TWT’s design, testing and manufacturing fields. European countries, the United States and other countries have implemented the TWT physical fields of collaborative simulation, but the domestic TWT’s simulation analysis of thermal and mechanical still mainly relies on the general software and the software programs, which are the secondary development of based on the general software. The domestic simulation software for TWT mainly aimed at the features of the electromagnetic simulation and not involving the fields of thermal and mechanical properties. The topic of this paper is based on the background.First of all, based on the research for the thermal stress finite element method simulation software at home and abroad, this paper selects the ANSYS software to carry on the key research. Provides direction for develop these stress analysis module of laboratory dedicated simulation software of microwave tube simulator suite(MTSS). Then, this paper uses the ANSYS software to analyze the thermal and structure coupling features of helix TWT slow-wave structure, introduces the concrete process of thermal-structure coupling numerical simulation and obtained the cloud picture of displacement and stress. Besides, analyzes the simulation results briefly and affirmed its real role in wave tube reliability analysis. Then, the basic theory of simulation calculation of thermal stress was given in this paper. Afterwards, deduced the finite element analysis of the basic matrix formula through the triangular element, and gave the specific implementation process of finite element calculation of thermal stress. Then, according to the analysis of the above, this paper developed the thermal stress finite element analysis of two-dimensional calculation program, through the flow chart of program are introduced the overall frame and each part of the implementation process. Finally, using the program based on the analysis and calculation of simple instance model, and use ANSYS simulation the same model to compare the results for make sure correctness of the program.This paper develops and implements the two-dimensional thermal stress finite element program based on the research of the thermal stress finite element calculation, lay a certain foundation for the development of the thermal stress analysis module of MTSS and provides guidance role for the realization of the three-dimensional finite element module. |
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