Study On Damage Characteristics Of Typical Shipborne Radar Equipment Caused By Fragments And Shock Waves

Shipborne radar plays an important role in modern ocean communication and has become an essential subsystem in ship systems.However,shipborne radar equipment has many electronic systems and relatively weak structures.Compared with the hull deck and bulkhead structures,its mechanical and explosion resistance and shock resistance performance are weaker,and it is easy to damage and fail under the action of explosive load fragments and shock waves.Conducting research on the damage of shipborne radar equipment caused by explosive loads is the basis for evaluating the damage performance of radar structures,This is of great significance for further improving the combat effectiveness and vitality of ships in practical combat.This article takes typical shipborne radars as the research object,and proposes damage criteria for fragments and shock waves by analyzing the damage effects of explosive loads on them.Therefore,the main work of this article is as follows: Firstly,vulnerability analysis is conducted on typical radars.Through the study of structural and functional characteristics,the working principles of various radar components and the connections between them are analyzed,and the key components of radar targets are identified,A damage tree analysis model was constructed and damage levels were classified Secondly,based on the characteristics of radar targets,simulation methods and experimental verification were conducted to investigate the damage of fragments and shock wave loads to radar.The damage effects of fragments with different speeds,sizes,and directions on the antenna shell were mainly studied for fragment loads;For shock wave loads,the damage effects of different equivalents,different proportional distances,and different positions were mainly studied Finally,the characterization of physical damage criteria and functional damage criteria for typical radar targets were analyzed.Based on the obtained conclusions,the corresponding physical damage threshold for functional damage of radar targets was obtained through extensive simulation research.The residual velocity curve,ultimate penetration velocity curve,and minimum penetration kinetic energy curve of fragment load were fitted,and different qualities were obtained The maximum penetration velocity and minimum penetration kinetic energy of fragments from different directions towards radar targets;The P-I curve of the shock wave load was fitted,and the front panel of the radar antenna was divided into four load combination areas: A,B,C,and D.The critical damage overpressure and critical specific impulse values for different shock wave loads were obtained,and the damage criteria were applied to a typical shipborne radar equipment damage assessment system.The main conclusions drawn are:(1)Fragments penetrating the antenna shell may not necessarily damage the antenna.If they hit the waveguide and cause a certain impact on the inner wall current,they can damage the antenna;(2)Shock waves can cause three types of damage effects on radar targets: plastic deformation,tensile tearing,and shear tearing;(3)The damage caused by shock waves to radar targets is not a single action,but a combination of shock wave overpressure and impulse;(4)The shock wave is not prone to deformation on the upper and side surfaces of the radar antenna,while the front plate surface is prone to deformation,and the degree of deformation on the front plate surface is as follows: the center point of the left(right)half face is greater than the near edge point of the left(right)half face is greater than the center point of the plate surface;(5)Due to the small structural unit of the IFF antenna,the impact surface of the shock wave on it is small,making it less prone to damage.The conclusions of this study can provide a basis for damage effect research and damage assessment techniques based on typical radar targets.