一维弹道修正弹增阻机构的设计+LS-DYNA仿真
时间:2020-11-15 10:25 来源:毕业论文 作者:毕业论文 点击:次
弹道修正弹的基本概念是 , 使用弹道修正引信对原 弹丸 的引信部分进行换装 ,由安装在引信上的探测模块探知弹丸在飞行过程中的实时位置与姿态 , 通过信息处理模块进行后续处理 , 获得弹丸的实际飞行弹道 , 将其与理想弹道进行比较 , 计算出二者的差值 , 从而通过控制模块与执行机构模块对实际弹道进行一次或几次修正 , 使其尽量接近理想弹道轨迹 。但由于引信的尺寸大小以及内部结构,使得阻尼片的尺寸受限制,加工难度加大,修正能力得不到保证。针对以上的问题,我们考虑将增阻机构放在弹底,这样既可以增大阻尼片的迎风面积,同时又可以降低加工难度。以某型号的底凹弹作为改造对象,对其底部结构进行改造设计,提出了弹底增阻机构的设计方案 。 利用 Ansys LS-DYNA 软件进行动力学仿真 。 最后采用 龙格 -库塔法 求解外弹道微分方程,对其修正能力进行分析。59545 毕业论文关键词:一维 弹道修正 增阻机构 外弹道 LS-DYNA 仿真 Title Title Title Title D esign of Increased resistance institutions for onedimensional trajectory corre c tion projectile .Abstract Abstract Abstract AbstractThe basic co ncept of ballistic correction is using trajectory correctionfuse to change the original part of the projectile fuse, ascertaining thereal-time position and attitude in the process of projectile in flight bythe installation on the fuse detection module ,and getting the actualfligh t trajectory of projectiles after information processing module forsubsequent processing. Compared with the ideal trajectory, the differencesare calculated. By comparing with the ideal trajectory, calculate thedifference between them . After the control module and the actuator modulewere carried out on the actual trajectory, one or more times correction,make it as far as possible close to the ideal trajectory.Due to the size of the fuse and the internal structure,the size of thedamping pieces are restricted, and it ’ s difficult to manufacture them.And the correction a bility can not be guaranteed. In view of the aboveproblems, we consider to add resistance mechanism on the bottom of theprojectile. In this way, it can not only Increase t he windward area ofdamping pieces, but also reduce manufacturing difficulty.To a certain type of bottom concave shells as a transform object, weconsidered to modify the bottom structure design, and come up with asolution. The kinematic and dynamic model was established and the analysiswas conducted with LS-DYNA software. Finally, a model of exterior ballisticwas established to analyse the potentiality of range correction. Key words A one-dimensional trajectory correction correction mechanismexterior ballistic LS-DYNA simulation 目 目 目 目 次 次 次 次 1 绪论 ··· 1 1.1 论文选题背景及意义 ··· 1 1.3 本文的内容安排 1 1 2 弹道修正机构设计与动力学分析 ·· 1 2 2.1 机构设计思路 ··· 1 2 2.2 机构总体设计 ··· 1 2 2.3 机构动力学分析 1 6 2.4 机构设计的理论计算 ·· 2 4 3 弹道修正弹的射程修正能力计算 ·· 2 7 3.1 弹道修正弹弹道数学模型的建立与解算 ··· 2 7 3.2 弹底修正机构修正能力计算 · 2 8 结论 ·· 3 1 致谢 ·· 3 2
参考文献 3 3 |