Structural Analysis And Optimization Design Of In-service Load Of Vehicle-mounted Active Phased Array Radar Based On Electromechanical Coupling

Active Phased Array Radar(Active Phased Array Radar,APAR)with scanning speed,multi function,high reliability and stealth performance is good,strong anti-jamming capability,and many other advantages,has been widely used in various fields.As an important component of vehicle-mounted weapons and equipment,the electrical performance parameters of APAR directly affect the vehicle's target search and guidance on the battlefield,thus affecting the vehicle's combat capability.In recent years,APAR has been developing in the direction of high frequency band,high gain,high power,high density,high precision,integration and intelligence,which also makes the mechanical and electrical coupling of APAR closer.For vehicle-mounted APAR,it will be affected by wind load,thermal shock,random vibration of road surface,overload,vibration of gun and other loads in the service environment.As a result,the radar antenna array will be deformed,which will affect the electrical performance of the antenna.In severe cases,the antenna structure may be damaged.In view of the high-performance vehicle-mounted APAR with complex structure,close electromechanical thermal coupling problem and interdisciplinary integration,the traditional design idea of electromechanical separation separated from electrical performance is not only difficult to accurately meet the current design requirements,but also extends the development cycle of vehicle-mounted APAR.In view of the above problems,this thesis takes vehicle-mounted APAR as the research object,and the main research contents are as follows:(1)The structure analysis and verification of vehicle-mounted active phased array radar are realized.In order to ensure the accurate and reliable work of APAR in the service environment,the structural mechanical properties of a certain APAR under typical load(steady wind load,overload,random vibration of road surface and impact of half-sinusoidal acceleration)were checked with ANSYS software,and then the influence of electrical performance was analyzed based on the APAR electromechanical coupling theory.The results show that the structural strength and electrical performance of the radar under four different loads meet the requirements.Among them,the impact of impact vibration load on the radar is the most significant,resulting in a decrease of 0.7 d B in radar gain and a decrease of 6.7 km in the maximum detection range.(2)The secondary development technology and system integration technology of ANSYS are studied.To reduce performance oriented APAR structure analysis and check the operation difficulty of implementation radar simulation analysis automation,intelligent structure,based on the ANSYS Parametric Design Language(ANSYS Parametric Design Language,APDL)and batch processing technology,implements the on-board APAR environment modeling and simulation in a typical load parameterized modeling,load exerting dynamic extraction automation,analysis,process automation,and results.This research has laid a technical foundation for the development of parametric modeling and automatic analysis module for structural analysis and optimization design software of vehicle-mounted active phased array radar based on electromechanical coupling.(3)The coupling optimization design method of radar structure based on experimental design is explored.To achieve the lightweight design of the radar in order to improve the chariots of mobility and battlefield viability,first of al,based on the active phased array radar structure deformation and the coupling model of radar detection performance parameters,established based on the theory of the electromechanical coupling mathematical model for optimal design of on-board APAR,then experimental design method(Design Of Experiments,DOE)used in vehicle active phased array radar structure lightweight design,finally achieved 10% of the optimization goal,a vehicle APAR weight loss at the same time satisfy the performance deterioration degree is not higher than 25% of the constraint condition.Through this part of the research,for the later software development of the optimization design module laid a solid foundation.(4)A software platform for structural analysis and optimization design of vehicle-mounted active phased array radar is established.In order to speed up the development process of vehicle APAR,shorten the development cycle and reduce the development cost,a software platform of structure analysis and optimization design for vehicle APAR electrica l performance was developed by using C++ Builder tool and based on the electromechanical coupling theory.The software can realize the structural performance analysis,electrical performance calculation and optimization design of vehicle APAR under different load environments.Finally in the case of a certain type of car APAR,radar for checking and electrical coupling structure was calculated,and through optimizing the vehicular APAR weight 440 kg,is up to 10% weight loss of the optimization goal and performance meet the requirements,thus verified the practicality and effectiveness of the simulation design software developed for other products to provide a reference and reference.