Research On Thermal Deformation Of Array Plane Of The Active Phased Array Radar And Its Simulation

With the development of modern science and technology,the mechanical thermal deformation caused by temperature changes has increasingly affected the performance and accuracy of instruments and equipment.The research on mechanical thermal deformation and thermal error has attracted more and more attention.As a kind of mechanical and electronic equipment to detect targets by electromagnetic wave,radar is of great importance in national defense.The development and performance improvement of the latest Active Phased Array Radar(APAR),which is integrated by various high-tech technologies,need more extensive and deeper research.Under actual working conditions,due to the existence of heat source and the change of temperature in service environment,the array planes of APAR will produce certain thermal deformation,resulting in the decrease of the flatness of the planes and the error of the relative position of T/R module on the planes,which affects the antenna gain,sidelobe level,pointing accuracy and other key parameters of the radar.Therefore,the thermal deformation of the array planes is the main factor affecting the electrical performance of the APAR.And the researches on thermal deformation law,simulation and compensation theory of radar plane have become one of the key factors to ensure radar performance.In this paper,the thermal deformation law and simulation of APAR are studied based on the designed radar experimental model,which provides a good reference for thermal deformation prediction and control of APAR and its performance improvement.Firstly,the development of APAR was systematically summarized,and the research significance of thermal deformation law of APAR was explained.Then,the research status of radar thermal deformation at home and abroad was investigated,and the existing problems and difficulties in the research of radar thermal deformation were analyzed.Secondly,in order to measure the thermal deformation of the array plane of APAR,a radar experimental model was designed by imitating a certain type of APAR,and a thermal deformation measurement system for APAR was established,including temperature control and measurement system and coordinate measurement system based on machine tool online detection technology.Then,considering the influence of power consumption of T/R modules and the module constraints on the thermal deformation of the array plane,the thermaldeformation measurement experiments of array plane under different experimental conditions were carried out by using the thermal deformation measurement system,and the thermal deformation law of the array plane of APAR was analyzed.Finally,the thermal structure sequential coupling simulation analysis of the thermal deformation of the array plane was carried out by using ANSYS.And the simulations of temperature field and thermal deformation of the array plane under different experimental conditions was realized.In order to solve the shortcomings of traditional ANSYS simulation method on thermal deformation simulation of array plane under different module constraints,an equivalent stress model for the thermal deformation simulation of array plane was established based on the thermo-mechanical conversion theory,and the thermo-mechanical conversion simulation was carried out and verified,which provides a reference for thermal deformation simulation of radar array.