引信空中自毁安全高度研究+LS-DYNA仿真
毕业论文关键词 引信技术 安全高度 动力学仿真 弹道计算 破片速度 杀伤半径
Title Study on Safe Height of Fuze Destructed in air
Abstract Safe height is the minimum height from the ground that not to endanger the safety of ground facilities and personnel conditions. Air-burst fuze or self-destruct maximum time limit will involve this concept of projectile warhead safe height. At present, to determine the safe height is generally based on effective kill radius of the fragments measured under static burst of projectile warhead .It requires that the fuze safe height is 6 to 8 times bigger than kill radius, but specific data is no uniform requirement. Studied on safe height of fragment through modeling by explosion mechanics and the ANSYS /LS-DYNA simulation then combined with external trajectory empirical formula and the process of fragment flying in air. Made a systematic summarize on the theoretical knowledge of projectile warhead fragments, and got tiny fragment distribution regularity of quantity and quality by using MATLAB programming. Combining fragment velocity attenuation regularity in flight with the various existing lethality criterion, made a research on the calculation of projectile warhead safe height, and introduced the safe height calculation process as a case study of 37 mm projectile. Using the research methods mentioned above to get safe height of 37 mm and 57 mm that is two different fragment types. Among them the safe height of 37 mm natural fragment projectile is 196 meters, the safe height of 37 mm prefabricated spherical fragment projectile is 497 meters, and the safe height of 37 mm prefabricated square fragment projectile is 261 meters; the safe height of 57 mm natural fragment projectile is 300 meters, the safe height of 57 mm prefabricated spherical fragment projectile is 632 meters, and the safe height of 57 mm prefabricated square fragment projectile is 518 meters. Compared with natural fragment, the safe height of prefabricated spherical fragment projectile is about 2 times that of natural fragment projectile, the safe height of prefabricated square fragment projectile is about 1.5 times that of natural fragment projectile. Finally, using ANSYS / LS-DYNA software, taking projectile warhead as the research object, established two static projectile burst projectile models of 37mm and 57mm projectile, observed the explosion process using the LS-Pre Post and getting the fragment velocity curve, checking the simulation of fragment initial velocity.