| The radar antenna,which may face with complex and harsh wind loads in service,is an important component of the radar system.The accurate prediction of mechanics behavior of the radar antenna under wind loads is not only an important basis for estimating the strength and stiffness of the radar antenna array,but also a key reference to guide the overall design,structural design and wind tunnel test of the radar antenna.Therefore,it is of great theoretical significance and engineering application value to investigate the mechanics behavior of radar antenna array under wind loads through numerical analysis methods.Based on the Computational Fluid Dynamics(CFD)and fluid-structure interaction theory,studies of the analysis methods for predicting the mechanics behavior of radar antenna structure under wind loads are carried out.First,based on the approximate model method,a polynomial response surface model is proposed to predict the wind load of antenna structure quickly.Through the experimental design method,the sample matrix of the approximate model is determined.Then,an automatic numerical analysis platform integrating multiple functional modules is developed for the numerical calculation of the sample database.Based on the complex correlation coefficient and the modified complex correlation coefficient,the polynomial response surface model is tested.The validity of the proposed model is verified by leave-one-out cross validation method.Secondly,based on the CFD method,the numerical analysis of wind load and fluid-solid interaction of the radar antenna structure under the average wind is carried out.The numerical model of the antenna structure is established to study the distribution of wind loads from different directions.Based on the results of CFD analysis and the one-way fluid-solid interaction numerical analysis platform,the stress distribution of antenna structure under the average wind load is obtained,which provides a reference for antenna structure design.Finally,based on the fluctuating turbulent inflow generation method and the basic theory of fluid-structure interaction,the numerical analysis of transient wind load and fluid-solid interaction is carried out on the antenna structure in the fluctuating wind field.Based on the harmonic superposition method,the fluctuating wind speed time history is generated with the Davenport spectrum as the target spectrum and applied to the flow field boundary.A one-way transient fluid-structure coupling numerical analysis platform is built to obtain the time course of displacement and stress response of the antenna structure under fluctuating wind load.The simulation results provide the foundation for the safety performance evaluation of the antenna structure under fluctuating wind load. |
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