|Table of Contents|

Analysis of internal ballistic contact resistance ofelectromagnetic railgun(PDF)

《南京理工大学学报》（自然科学版）[ISSN:1005-9830/CN:32-1397/N]

Issue:
2019年03期
Page:
306-311
Research Field:
Publishing date:

Info

Title:
Analysis of internal ballistic contact resistance ofelectromagnetic railgun
Author(s):
Wang Xuejun; Gu Jinliang; Luo Hong’e; Tian Hui; Li Baoming
National Key Laboratory of Transient Physics,Nanjing University of Science and Technology,Nanjing 210094,China
Keywords:
electromagnetic railguns;  contact resistances;  armatures;  tracks;  magnetic diffusion models;  Maxwell equations;  Hom contact model
PACS:
TM89
DOI:
-
Abstract:
A magnetic diffusion model for the U-type armature and simple track is established,and the contact pressure and electromagnetic thrust between the armature and track are calculated according to Maxwell equations to study the change of contact impedance between the armature and track of a electromagnetic railgun. Considering the influence of the contact form and contact pressure,the change of contact resistance during armature movement is calculated according to Hom contact model,and the change of additional contact resistance caused by velocity skin effect is introduced into armature dynamic analysis. Comsol Multiphysic finite element analysis software is used to analyze the armature mechanics,and the contact resistance curve in the armature movement process is get through the software and MATLAB joint programming. The change of contact impedance is between 0.22 mΩ and 4.5 mΩ,and the armature velocity has a great influence on the change.

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Last Update: 2019-06-30