Analysis Of The Infrared Characterizations Of Ballistic Missile Warhead In The Midcourse Under Countermeasure

This thesis introduces the 3-D transient temperature distribution model and infrared characteristics model of the ballistic missile's warhead, collects and tests some parameters of the ballistic missiles'and baits' material properties, and analysis the error of the test results, using the model calculates and compares different boundary conditions'influence to the temperature distribution of warhead under different materials, different thickness of missiles. Based on the theory of sensitivity, establishes temperature sensitivity model of the materials' characteristic parameters, discusses different parameters'and different values'of the same parameter temperature sensitivity, which provides basis for the parameters' selection of missiles'design.According to the principle of heat insulating, considering the different condition of contact between multilayer reflective foils and spacer materials, calculating radition with Monte-Carlo method, establishes the transient coupled heat-transfer model of MTI(multilayer thermal insulation), obtains the temperature variation in each layer of reflective foils and equivalent parameters of MTL by numerical calculation, calculates and compares the temperature distribution and infrared characterizations before and afer adding MTI to the outside surface of missle, the results indicate that MTI can reduce the temperature and infrared characterizations of the ballistic missile's warhead, especially in shadow.Above-said theory research and date analysis can be used for the design of ballistic missile and MTI, the development of infrared countermeasures.