Natural Aging Characteristics of Electro-Mechanical Arm Fire Device

Myunggeun Ahn; Dong-seong Kim; Seung-gyo Jang

doi:10.6108/KSPE.2024.28.4.058

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2024 Vol.28, Issue 4 Preview Page Next Page

TECHNICAL PAPERS

Natural Aging Characteristics of Electro-Mechanical Arm Fire Device 전기-기계식 점화안전장치 자연 노화 특성 연구

31 August 2024. pp. 58-66

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Abstract

This investigation undertakes a comprehensive analysis of the life extension and performance attributes of Electro-Mechanical Arm Fire Device(AFD) systems, manufactured between 2002 and 2006, that have undergone a natural aging process spanning approximately two decades. Aging characteristics were meticulously evaluated through a series of environmental tests, Closed Boom Tests(CBT), and Electromagnetic Compatibility(EMC) tests, all conducted in adherence to US military standards. Following disassembly, a thorough examination of internal components for aging and corrosion was performed. The combustion performance test, particularly the CBT, indicated that 90% of the targeted devices demonstrated passable performance. The system achieved certification for compliance in accidental ignition scenarios during EMC testing. Upon post-disassembly analysis, no evidence pertaining to moisture penetration was observed, and all AFDs exhibited normal operational functionality. Nevertheless, a subset of AFDs manifested component defects during a 30-day high-temperature storage test, specifically designed for accelerated aging simulations. While the Electro-Mechanical AFD showed no defects after its natural aging over two decades, minor discrepancies surfaced during additional accelerated aging tests. These discrepancies did not compromise arming and ignition performance, affirming the feasibility of extending the life extension by an additional three years.

Keywords

Pyrotechnic Mechanical Device

Electro-Mechanical Arm Fire Device

Natural Aging

Accelerated Aging Test

Life Extension

2002년~2006년에 제작되고 약 20년 자연 노화된 전기-기계식 점화안전장치를 이용하여 노화 특성 평가를 통해 수명연장과 이에 따른 성능분석을 수행하였다. 미군사규격을 기반으로 환경시험, 밀폐용기 시험 및 전자파 간섭시험을 수행하였으며, 시제 분해 후 내부 부품 노화 및 부식도 분석을 수행하였다. 밀폐용기 시험을 통한 연소성능시험 결과에서 대상 시제의 90%가 성능 적합 판정을 받았으며, 전자파 간섭을 통한 우발점화 평가에서도 적합성을 확인하였다. 또한 부품 분해 후 수행된 분석에서는 수분 침투 흔적이 없었으며, 모든 점화안전장치가 정상적으로 작동하였다. 그러나 가속노화 시험항목은 30일 고온저장 시험 중 일부 시제의 부품 결함이 발견되었다. 따라서 본 전기-기계식 점화안전장치는 약 20년의 자연 노화에도 어떠한 결함이 발견되지 않았으나 수명연장을 위한 추가적인 가속노화 환경시험에서 미미한 결함이 발생하여 자연 노화 수명은 약 20년 정도로 예측한다. 추가적인 가속노화시험에서 발생한 미미한 결함은 점화 성능에 영향이 없었으므로 3년의 수명연장이 가능한 것으로 판단한다.

키워드

파이로 장치

전기-기계식 점화안전장치

자연 노화

가속노화시험

수명연장

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Information

Publisher :The Korean Society of Propulsion Engineers
Publisher(Ko) :한국추진공학회
Journal Title :Journal of the Korean Society of Propulsion Engineers
Journal Title(Ko) :한국추진공학회지
Volume : 28
No :4
Pages :58-66
Received Date : 2024-04-05
Revised Date : 2024-06-18
Accepted Date : 2024-06-24
DOI :https://doi.org/10.6108/KSPE.2024.28.4.058

Journal of the Korean Society of Propulsion Engineers ISSN:1226-6027(Print) 2288-4548(Online) 한국추진공학회지

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