Research On Thermal Deformation Prediction Of Radar Array Based On Non-similarity Theory

As a high-precision detection instrument,the array antennas of active phased array radar can transmit and receive electromagnetic waves independently,so the active phased array radar can detect and track targets efficiently,accurately and stably,which makes it play an extremely important role in military,navigation,communication and other fields.During the working of the active phased array radar,the thermal deformation of the array surface is caused by the thermal power consumption of the antenna heat source,which worsens the radar feed performance to some extent.Therefore,the simulation prediction and compensation of the thermal deformation of the radar are one of the important measures to improve the radar performance.The traditional finite element simulation does not consider the non-similar thermal deformation caused by the boundary constraints of the structure,so the prediction accuracy of the simulation is insufficient.Therefore,the theory of non-similar thermal deformation is studied in this paper,the idea of non-similar thermal deformation theory is introduced into the finite element analysis,and the prediction model of radar array thermal deformation based on nonsimilar theory is proposed,and the correlation analysis and model prediction are carried out according to the thermal deformation experiment of active phased array radar model.By comparison,the effectiveness of the model and the necessity of introducing nonsimilar thermal deformation are illustrated,which also provides a theoretical reference for the control of thermal deformation of the array of active phased array radar.The main research results are as follows:1)This paper systematically summarizes the research progress of radar thermal deformation and non-similar thermal deformation theory,explains the necessity of the research of non-similar thermal deformation theory,and puts forward and verifies the calculation formula of non-similar thermal deformation,which lays a foundation for the application of non-similar thermal deformation theory.2)Applying the non-similar thermal deformation theory formula to the finite element analysis method,a radar array thermal deformation prediction method based on the non-similar thermal deformation theory is proposed,and the body boundary constraint parameters in the prediction model are obtained by using gradient descent method.3)Thermal deformation experiments are carried out on the radar array experimental model.The thermal deformation and temperature data of the radar experimental model under different experimental conditions are measured by using the radar array thermal deformation and temperature synchronous measurement system,which provides the analytical data for the study of its thermal deformation prediction model.4)The radar array thermal deformation prediction model based on the non-similarity theory proposed in this paper is used to model and predict the radar array thermal deformation under different experimental conditions.The comparison with the traditional ANSYS thermal structure sequential coupling simulation results shows the effectiveness of the prediction method and the necessity of the introduction of nonsimilarity thermal deformation.In addition,the compensation principle and effect of the thermal deformation of the radar array are analyzed,which provides a reference for the study of the non-similar thermal deformation of the radar array and the structural design.