Reconstruction Of Temperature Field Of Liquid Cooled Plate

Phased-array radars play a vital role in both military and civilian applications.Phased array radar uses the spatial synthesis of multiple Transmitter and Receiver components(T/R)components to transmit and receive beams,and due to the large power of phased array radar,heat dissipation generally uses liquid-cooled cold plates for heat dissipation,and the commonly used liquid-cooled cold plates cannot guarantee the homogeneity of multiple T/R components,and when the temperature changes of T/R components are inconsistent,it will cause the transmit and receive beam deviation,affecting the accuracy of radar target identification and tracking,and even leading to mission failure.If the temperature of the T/R component of the phased-array radar antenna can be determined,the electrical parameters of the T/R component can be adjusted to restore the target identification and tracking accuracy of the radar.In this thesis,data obtained from limited temperature measurement points are used to reconstruct the temperature field of the liquid-cooled cold plate,and the temperature field of the liquid-cooled cold plate is rapidly twinned into the upper computer by digital twinning.The study aims to explore a low-cost method for reconstructing the temperature field of liquid-cooled cold plate of phased-array radar in operation and an intuitive form of cold plate data feedback,to guide the phased-array radar antenna in the adjustment of electrical parameters of T/R components and to correct the errors caused by temperature.The main work is as follows.Firstly,the distribution and structure of liquid cold plate and heat source in phased array radar antenna are analyzed,and a liquid cold plate model is established to analyze the liquid cold plate of phased array radar antenna.Based on this model,the temperature field reconstruction algorithm of the liquid-cooled cold plate is built,which is suitable for the reconstruction of the temperature field of liquid-cooled cold plate with finite point temperature measurement,complex boundary conditions,and two kinds of heat transfer media,solid and liquid,inside the model.Then,the influence of heat source distribution,sensor distribution and cold plate size on the reconstruction accuracy is analyzed,and the conditions of applicability of the algorithm are derived.And on this basis,a phased-array radar antenna liquid-cooled cold plate is combined with this algorithm to reconstruct the temperature field and compare the simulation results to verify the practical application of the algorithm.Secondly,the layout of temperature measurement points on the surface of the liquid-cooled cold plate of the phased-array radar antenna is optimized by using Genetic Algorithm(GA).A sensor layout with less number of temperature measurement points and higher reconstruction accuracy is found.The optimization results are compared with the simulation results for temperature field reconstruction.An experimental platform is built to conduct experiments on the simplified model to verify whether the experimental structure is reasonable and to pave the way for the subsequent digital twin.Finally,based on the current digital twin application scenario,the digital twin is combined with the temperature field reconstruction,and the digital twin is built for the liquid-cooled cold plate experimental platform and verified experimentally.The results of the liquidcooled cold plate digital twin are compared and analyzed with the experimentally measured results,and the accuracy of the liquid-cooled cold plate digital twin system is verified.The idea of how the digital twin results can be applied to the error correction of phased-array radar antenna is proposed.