Research On Mechanical-thermal-electromagnertic Coupling Analysis And Optimization Design Of Radome

The radome at the front part of high-speed aircraft not only bears severe aerodynamic mechanical and aerodynamic thermal loads,but also plays an important role in protecting radar guidance system and other key electronic systems.Therefore,the radome not only needs to meet the requirements of mechanical and thermal performance,but also the electromagnetic performance of radar.However,mechanics,thermodynamics and electromagnetics are interdisciplinary problems,and the combination of mechanical,thermal and electromagnetic parameters are difficult,because of the absence of the intersection of these three kinds of parameters.As a result,during the traditional design process of the radome,thermo-mechanical design and electromagnetic design are independent of each other,which makes the research on mechanical,thermal and electromagnetic integration analysis of the radome lags behind.In the mechanical design stage,the electrical performance of the radome is not considered.On the contrary,the mechanical properties of radome are not considered in the electrical design stage.However,accurate mechanical,thermal and electromagnetic coupling analysis is not only an important basis to explore the service safety of the radome,but also the foundation of the stability of the detection,scanning and stealth performance of the high-speed aircraft.Therefore,it is urgent to carry out the research on the mechanical,thermal and electromagnetic coupling analysis and optimization design of the radome.The main work of this paper is as follows:The finite element-multi-layer fast multipole method is developed,which is suitable for mechanical,thermal and electromagnetic coupling analysis of the radome.Although the multilayer fast multipole method has high calculation accuracy and efficiency,it cannot consider the influence of medium deformation and material parameters change in the process of analyzing electromagnetic scattering problems.Based on the finite element theory,the theory of electromagnetic wave propagation in lossy medium and the multi-layer fast multipole method,the finite element-multi-layer fast multipole method is developed by introducing the deformation of medium and the change of material parameters into the multi-layer fast multipole method.The propagation process of electromagnetic waves in the radome is equivalent to electromagnetic waves which go through an infinite plate with oblique incidence angle.The accuracy of the finite element-multi-layer fast multipole method proposed in this paper is verified based on the equivalent four port transmission line theory.The result shows that the accuracy of the finite element multi-layer fast multipole method is reliable.The transmission performance of the radome under different aerodynamic mechanical and aerodynamic thermal loads is analyzed by using the finite element-multi-layer fast multipole method.The influence of radome structural deformation on the transmission performance under different aerodynamic mechanical loads is analyzed.The influence of structural deformation and material parameters change on the transmission performance of the radome is studied.The transmission performance of the radome under the aerodynamic mechanical and thermal loads is analyzed.Based on the finite element-multi-layer fast multipole method and particle swarm optimization,the optimal analysis of the radome transmission performance under aerodynamic mechanical and thermal loads is carried out.The results show that the deformation caused by aerodynamic mechanical and thermal loads has little influence on the transmission performance of the radome,and the material parameters change caused by aerodynamic thermal loads has a great influence on the transmission performance of the radome.The influence of aerodynamic mechanical and thermal loads on the transmission performance should be fully considered during the design stage of radome.Based on the finite element-multi-layer fast multipole method,a specialized software for the mechanical,thermal and electromagnetic coupling analysis and optimization of the radome is built.Based on the transmission performance of radome under aerodynamic mechanical and thermal loads,the software of mechanical,thermal and electromagnetic coupling analysis and optimization of the radome was built by combining QT,ABAQUS,Hyper Mesh,MATLAB software and C++,Python and TCL programing languages.The software can be divided into three parts: mechanical performance analysis part,electrical performance analysis part and optimization analysis part.The results of the analysis of radome mechanical and electromagnetic performance of this software are compared with the results gotten from commercial software.The results demonstrate that the accuracy of this software is reliable.