Analysis of Sliding Electric Contact Characteristics of Series-augmented Railgun Based on Breech Voltage

doi:10.3969/j.issn.1000-1093.2020.07.004

Abstract

Abstract: An analysis method based on the breech voltage is proposed to study the sliding contact resistance characteristics of the partially augmented electromagnetic railgun. A mathematical model of contact resistance, breech voltage, breech inducted voltage and rail current is constructed. The proposed model is used to quantitatively characterize the sliding contact resistance. Through the analysis of the characteristics of the contact resistance waveform, the state of contact between armature and rail is divided into four stages: start-up stage, resistance steady decline stage, resistance growth stage, and single rail stage. The launch efficiency of launching system and the energy consumption rate of contact resistance Joule heat are calculated. The results show that the contact resistance is high as the interface between the armature and rails is in a solid-solid contact state at the initial startup stage; the gradually formed aluminum melt film increases the actual contact area and improves the contact state; the contact pressure is negatively correlated with contact resistance; the contact resistance is an important factor affecting launching efficiency. Therefore, the analysis of the sliding electric contact characteristics of the partially angmented railgun plays a positive role in the mechanism research and design of the railgun. Key

Key words: partiallyaugmentedelectromagneticrailgun, contactresistance, breechvoltage, contactresistanceJouleheat

CLC Number:

TJ866

ZHU Chunyan, WANG Jun, MA Fuqiang, NI Yanjie, TANG Bo, LI Baoming. Analysis of Sliding Electric Contact Characteristics of Series-augmented Railgun Based on Breech Voltage[J]. Acta Armamentarii, 2020, 41(7): 1280-1287.

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第41卷第7期2020 年7月
兵工学报ACTA ARMAMENTARII
Vol.41No.7Jul.2020

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[2]	WANG Zhen-chun， BAO Zhi-yong， CAO Hai-yao， LIU Fu-cai， ZHAN Zai-ji， WANG Da-zheng. Research on Contact Characteristics of Armature and Rail in Augmented Electromagnetic Railgun [J]. Acta Armamentarii, 2018, 39(3): 451-456.