【作者】 李峰；

【导师】 李豪杰；

【作者基本信息】 南京理工大学 ， 机械电子工程， 2017， 硕士

【摘要】 机电引信应用于电磁轨道炮,可以实现对弹药的控制,最大程度发挥电磁轨道炮弹药的毁伤效能。电磁炮弹药发射过程的动力学特性研究是引信设计的基础。同时,对于电磁轨道炮膛内强磁场环境,需要采取合理的防护措施保证机电引信控制电路的工作可靠性。基于此研究背景,本文开展机电引信对电磁轨道炮强磁场环境的屏蔽与利用研究,研究内容主要涉及到以下几个方面:为了研究电磁轨道炮发射过程中膛内磁场变化特性,首先对电枢进行动力学分析。在考虑导轨电感梯度与电阻梯度非线性变化的基础上,建立电枢运动方程,求解得到电枢受力、速度和位移曲线。根据激励电流幅值、频率和电枢位移的瞬时同步性,设置电磁轨道炮不同时刻的发射参数,利用Maxwell涡流求解器实现磁场动态仿真,得到电磁轨道炮膛内磁场时域变化特性与空间分布特性。电枢动力学特性与磁场特性为电磁炮引信安全系统设计提供依据。为了提高电磁轨道炮机电引信在低频强磁场环境的生存能力,开展被动屏蔽方案研究。通过分析屏蔽体材料、结构、位置、底部通孔形状对屏蔽效能的影响,对屏蔽体进行优化设计。仿真结果显示,优化后的屏蔽体内部考察面的平均磁通密度峰值约为0.0028T,考察面的屏蔽效能达到37.33dB。机电引信控制电路在屏蔽后的弱磁场环境中可以可靠工作。根据电磁感应原理,基于电磁轨道炮膛内特有的磁场环境,提出感应线圈作为机电引信电源的方案,并进行可行性分析。通过考察线圈半径、位置、匝数对感应电动势的影响,优化线圈结构。针对线圈产生的感应电动势与感应电流的时域变化特性,设计机电引信电源储能稳压电路,并通过能量储存实验确定最佳稳压方案。更多还原

【Abstract】 The application of electromechanical fuze in electromagnetic railgun can achieve the control of ammunition and maximize the damage efficiency of electromagnetic railgun ammunition.Research on dynamic characteristics of projectile during the launching process of electromagnetic gun is the basis of fuze design.Besides,reasonable protective measures should be taken to improve the working reliability of control circuit in electromechanical fuze for electromagnetic railgun in-bore high magnetic field.Based on this research background,this thesis carries out research on the shielding and utilization of electromagnetic railgun’s high magnetic field environment for electromechanical fuse.The research contents are mainly related to the following aspects.In order to study the change characteristics of the in-bore magnetic field during the launching processes of the electromagnetic railgun,first of all,the dynamic analysis of the armature is carried out.In consideration of the nonlinear variation of the inductance gradient and the resistance gradient,the armature movement equations are established.And then the curves of armature force,velocity and displacement are obtained by solving the armature movement equation.According to the instantaneous synchronization of exciting current amplitude,frequency and the armature displacement,the raigun’s launching parameters of different time are set up.Then Maxwell eddy current solver is utilized to achieve dynamic simulation of magnetic field and get time-varying characteristic and spatial distribution characteristics of railgun in-bore magnetic field.Armature dynamic characteristics and magnetic field characteristics provide basis for design of electromagnetic gun fuze safety system.In order to improve the viability of electromagnetic fuze in the low frequency strong magnetic field of electromagnetic railgun,researches on passive shielding scheme are imperative.Based on analyzing the influence of shielding material,structure,position and bottom hole shape on the shielding effectiveness,the optimal shielding scheme can be designed.The simulation results show that the average peak flux density of inspection surface in the optimized shield is about 0.0028T,and the shielding effectiveness of the inspection surface reaches 37.33dB.The control circuit in electromechanical fuze can work reliably in the weak magnetic field after shielding.According to electromagnetic induction theory,we can present the proposal of induction coil as the power supply for electromagnetic fuze and analyse the feasibility,based on in-born specific magnetic field of the electromagnetic railgun.By investigating the influence of coil radius,position and turn number on the induced electromotive force,the coil structure is optimally designed.According to the time domain variation characteristics of induced electromotive force and induced current generated by the coil,the energy storage and voltage stabilizing circuit of electromagnetic fuze power supply is designed,and the optimal scheme of steady voltage is determined by the energy storage experiment.更多还原