DocumentCode :
738832
Title :
Investigations of the Armature–Rail Contact Pressure Distribution in a Railgun
Author :
Deng Feng ; Junjia He ; Shengguo Xia ; Lixue Chen ; Liangliang Tang ; Jun Li ; Ping Yan
Author_Institution :
China City Environ. Protection Eng. Ltd. Co., Wuhan, China
Volume :
43
Issue :
5
fYear :
2015
fDate :
5/1/2015 12:00:00 AM
Firstpage :
1657
Lastpage :
1662
Abstract :
In the process of electromagnetic launch, the nonuniform contact pressure distribution on the armature-rail interface kept changing with the armature moving forward. At first, the contact pressure was mainly provided by the deformation of the trailing arm, from which it could keep a good metal-metal contact at the armature-rail interface. After the pulse current was constructed, the magnetic pressure would dominate the contact pressure because it was much larger than the mechanical interference pressure. In this paper, the 3-D modeling of contact pressure distribution was carried out with the finite-element method. In the simulation of 3-D contact calculations, the current entered the armature from the trailing edge. The electromagnetic force perpendicular to the armature trailing arm was equivalent to the uniform load on the inner surface of the trailing arm. A typical contour pattern of nonuniform contact pressure distribution was acquired. Some nonuniform coefficients of contact pressure distribution were proposed and analyzed to evaluate the contact performances between the armature and rails. A series of simulations was conducted at different magnitudes of magnetic pressure, and with different armature structure parameters. The characteristics of the nonuniform coefficients were investigated and discussed. The dependences of the nonuniform coefficients on the equivalent uniform load and armature structure parameters were obtained.
Keywords :
electrical engineering computing; electromagnetic forces; finite element analysis; railguns; solid modelling; 3D modeling; armature trailing arm; armature-rail contact pressure distribution; armature-rail interface; electromagnetic force; electromagnetic launch; finite-element method; nonuniform contact pressure distribution; railgun; Armature; Contacts; Electromagnetics; Finite element analysis; Interference; Load modeling; Railguns; C-shaped armatures; Contact pressure distribution; equivalent uniform load; nonuniform coefficients; railgun; railgun.;
fLanguage :
English
Journal_Title :
Plasma Science, IEEE Transactions on
Publisher :
ieee
ISSN :
0093-3813
Type :
jour
DOI :
10.1109/TPS.2015.2418215
Filename :
7084163
Link To Document :
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