| Radar antennas have played an important role in modern warfare and civil aviation.With the opening of Chinese new plan of strengthening the army,based on the modern defense needs of war,the construction of radar antennas and their protective equipment—radomes gradually increase.The metal frame radome is a novel structure.It is composed of a metal frame and architectural membrane materials.The structure has good structural integrity,fast construction speed,and great development potential.At present,the design of metal frame radome in China is still at the preliminary stage.The calculation of structural bearing capacity only considers the frame and ignores the skin effect of the membrane material.This design method limits the construction of large-span radomes.Therefore,it is imperative to consider the design of the skin effect of the metal skeleton radome structure.However,due to the large difference in surface stiffness between the skeleton and the skin,there are problems of convergence and calculation efficiency in the finite element calculation of the radome structure.These problems improved the difficulty of the design of the metal frame radome structure.Based on the above problems,this paper establishes a numerical simulation method that can be used to calculate the overall stability performance and local stability performance of the metal frame radome considering the skin effect,and uses experiments to verify the method.The mechanism of the skin effect of the metal frame radome structure is deeply studied,and an empirical formula for the stable bearing capacity of structural members is proposed.On this basis,a simplified numerical simulation method considering the skin effect of the metal frame radome structure is proposed,and it is packaged into the metal frame radome structure analysis software.The content of the paper can be divided into the following parts:(1)The static loading test of the double-triangular element of the radome structure was carried out,and the influence of the skin effect on the stable bearing capacity of the element was explored.The numerical simulation method of the radome structure is improved,and the reliability of the numerical simulation method is verified by combining the static loading test results.(2)In-depth analysis of the mechanism of the skin effect of the metal frame radome structure.On the basis of the proposed simplified model of double triangular elements,the factors affecting the stability of the metal frame radome structure are analyzed,the simplified model is verified and improved,and the stable bearing capacity of the metal frame radome structure considering the skin effect is summarized.Empirical formula of force.Finally,the influence of structural span and bar size on the overall stability of the structure is analyzed.(3)The simplified analysis method of the metal frame radome structure is explored.First,the analysis process of the double-triangular element of the metal skeleton radome was simplified.The three proposed simplification methods were compared,and the two methods with higher accuracy were selected to continue to simplify the overall radome,and the vertical load,The simplified calculation results under wind load are compared,and the stable bearing capacity of different span metal frame radomes obtained by the two simplified methods are compared.Finally,a more accurate simplified method is given.(4)Developed the structural analysis software of the metal frame radome.On the basis of the above research,using Visual Studio 2019,based on Visual Basic language and ANSYS APDL command stream,developed an analysis software for the metal skeleton radome structure,considering its skin effect,and applied it in actual engineering. |
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