增强型轨道炮电感梯度及其影响因素  

Augmented rail gun inductance gradient and its affecting factors

作　　者：刘守豹[1] 阮江军[1] 张亚东[1] 苏毅[1] 

机构地区：[1]武汉大学电气工程学院,湖北武汉430072

出　　处：《电工电能新技术》2009年第2期50-53,67,共5页Advanced Technology of Electrical Engineering and Energy

摘　　要：电感梯度对轨道炮性能有着重要影响。为了实现对增强型轨道炮电感梯度的数值计算,推导了电枢受力公式,介绍了二维时谐涡流场的控制方程,建立了计算电感梯度的二维有限元模型,对一种典型结构增强型轨道炮的电感梯度进行了精确计算,讨论了电感梯度受时谐分析频率和外轨道尺寸影响的规律,给出了不同影响因素下轨道内部电流密度和空间磁力线的分布图,并据此解释了电感梯度变化的原因。根据分析结果给出了增强型轨道炮的优化设计方案。Inductance gradient directly relates to the magnetic force applied on armature and has great influence on the performance of a rail gun. Comparing with analytic method and experimental measurement method,numerical method has great advantage in obtaining inductance gradient. In order to realize the numerical computation of inductance gradient of augmented rail gun,this paper deduced the armature＇s force formulation,illustrated the inductance gradient＇s physical meaning,explained the simplified treatment of real model in simulation,and built a rail gun＇s 2D finite element method,and a typical structure augmented rail gun＇s inductance gradient was calculated accurately. The influence of loading current＇s frequency and outer rail＇s dimensions on inductance gradient were discussed; distribution of eddy current field in rail and spatial magnetic lines of force under varied influencing factors and outer rail dimensions was displayed and the cause of change in inductance gradient was explained. According to the analysis results,optimal design of augmented rail gun is suggested.

关 键 词：增强型轨道炮 电感梯度 虚功原理 有限元法 趋肤效应 涡流 

分 类 号：TM151[电气工程—电工理论与新技术] TM216[一般工业技术—材料科学与工程]