• Title/Summary/Keyword: 분리 시험

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Development of an Explosive Bolt for Sled Test Application (슬레드 시험용 폭발볼트 개발)

  • Lee, Juho;An, Woo-Jin;Kim, Yong-Seok
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.48 no.4
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    • pp.269-275
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    • 2020
  • An explosive bolt is one of many representative pyrotechnic release devices that separates two joined structures using explosives inside the bolt. In this study, a 1/2 inch ridge-cut explosive bolt with an EBW detonator was developed for usage in sled tests. The initial shape design was carried out based on the design method, and the performance test showed that the separation performance was outstanding but fragments occurred. Therefore, numerical analysis was performed to reduce the amount of debris by minimizing the amount of explosives. From the numerical analysis, the separation mechanism and characteristics of the ridge-cut explosive bolts were identified, and the minimum amount of explosives that does not generate debris was proposed. Verification tests revealed that the ridge-cut explosive bolts with the proposed explosive weight minimized fragments while maintaining the separation performance.

Evaluation of Structural Integrity of Aircraft External Fuel Tank for Separation Loads (분리하중에 대한 항공기용 외부연료탱크 구조 건전성 평가)

  • Hyun-gi Kim;Sungchan Kim;Min-su Park;Su-hong An
    • Journal of Aerospace System Engineering
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    • v.18 no.1
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    • pp.64-71
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    • 2024
  • The external fuel tank of an aircraft is a main component that can increase the cruising range of the aircraft. It must be able to be stably separated from the pylon in an emergency situation. At this time, a separation load is applied to the fin and the pivot of the external fuel tank. To stably separate the external fuel tank, the structural soundness of the fin and the pivot must be confirmed. In this study, structural tests were conducted to verify the structural integrity of the external fuel tank pin and pivot when the external fuel tank was separated from the aircraft. Results are then presented. In this paper, a test configuration diagram consisting of the hydraulic and load control equipment, data acquisition system, and pneumatic supply unit used in the structural test was explained. Test installation and test load application plan for each test condition were provided. As results of the structural test, it was found that test load and internal pressure of the test specimen were properly controlled within the allowable range in each test. It was confirmed that serious structural defects in the test specimen did not occur under required load conditions. In conclusion, through structural test for design limit load and design ultimate load, it was proven that the fin and pivot of the external fuel tank for aircraft covered in this study had sufficient structural strength.

체결 및 이탈겸용 4-팁 와셔 부품 설계

  • 김형원;문순일
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 1997.11a
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    • pp.19-19
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    • 1997
  • 휴대용 미사일의 1단과 2단 추진기관은 체결부품에 의하여 연결되어 발사관 내에서 운반되어지며, 발사 시 1단 추진기관이 분리되게 된다. 이때에 분리력은 1단 추진기관의 압력에 의하여 제공되고 체결부품인 4-팁 와셔는 어느 압력 이상을 받으면 추진기관의 1단과 2단을 분리한다. 정적시험을 하여 구한 결과를 해석치 와 비교했으며 실제상황에 유사한 동적 시험을 하여 필요한 안전계수를 구하였다.

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The Strength and Environmental Friendly Characteristics of Non-chemical Accelerating Shotcrete (비약액계 급결성 숏크리트재의 강도특성과 친환경성)

  • Chun, Byungsik;Park, Dukhyum;Kang, Hyoungnam;Do, Jongnam
    • Journal of the Korean GEO-environmental Society
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    • v.9 no.5
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    • pp.29-36
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    • 2008
  • The shotcrete is a NATM technique as a major tunnel support for ground stability after tunnel excavation. Instead of a general concrete lining method, it is a trend for curtail of construction periods and reduction of construction expenses that required to use of the permanent shotcrete lining. This high-strength shotcrete is required to use as a permanent shotcrete lining. This brought out the solution of environmental pollution and harmfulness to human. Accordingly, in this study specimens for strength measurement were made to develop shotcrete possible to develop materials in early with cement mineral accelerator as NATM method construction. It was compared with existing shotcrete material, unconfined compression test, flexural strength test, antiwashout underwater test were experimented. The fish poison test was experimented to evaluate an influence of environment. As a results of the test, unconfined compressive strength and flexural strength were equivalent with 28-curing day strength of existing material. An antiwashout of research subject material was revealed excellently in antiwashout Underwater test. As a results of the fish poison, an evaluation research subject material was founded more environmentally friendly than existing shotcrete.

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Study of Aging and Performance About Separation Devices Has Been Stored (장기 보관된 분리장치의 성능 및 노화에 관한 연구)

  • Kim, Dong-seong;Jin, Hong-Sik
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.49 no.7
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    • pp.565-572
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    • 2021
  • In this study, a study on the performance and aging of explosive bolts stored for a long time among pyrotechnic mechanical devices(PMD) used as separation devices in the defense field is conducted. For this, explosive bolts that had been installed in the weapon system for about 10 years are secured. Performance and life extension test procedures are established based on the AIAA Standard and MIL-STD. Before performance evaluation, non-functional tests are performed to check whether external changes or failures occurred. Next, circuit inspection and X-ray tests are conducted to check the failure in internal circuits and structures. After that, performance test is carried out to confirm the operation of the samples that passed the non-functional test. Through this test, separation of bolt and separation time are measured, and some samples are tested after a high temperature storage test to confirm the remaining life and the possibility of extension. Finally, the remaining life and reliability are predicted based on the results of the test and the Arrhenius model to identify remaining shelf life and reliability depend on time.

Non-explosive Low-shock Separation Device for small satellite (소형 위성용 비폭발식 저충격 분리장치)

  • Park, Hyun-Jun;Tak, Won-Jun;Han, Bum-Ku;Kwag, Dong-Gi;Hwang, Jai-Hyuk;Kim, Byung-Kyu
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.37 no.5
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    • pp.457-463
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    • 2009
  • This paper describes the development of non-explosive separation(NES) device which can be equipped on a small satellite. It comprises mechanism itself and spring-type shape memory alloy(SMA) actuator. In order to design SMA actuator properly, the necessary actuation force is measured. Based on that result, SMA actuator is designed and fabricated. Finally, SMA actuator and the proposed mechanism are integrated. In order to evaluate performance of the developed NES, we carried out a response time test, preload test and shock level test. In near future, we expect to replace the imported NES device with the developed device.

Pneumatic Test Assessment of Pulse Separation Device for Multi-Pulse Rocket Motor (다중펄스 로켓모타 적용 펄스분리장치의 공압시험평가)

  • Lee, Dong-Won;Lee, Won-Bok;Kang, Seong-Yeop;Lee, Jong-Won;Chang, Hong-Been
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2010.05a
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    • pp.101-104
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    • 2010
  • A bulkhead-type pulse separation device has been developed for the multi-pulse rocket motor. The design parameters of the pulse separation device were the shape of the rupture disc slit, welding conditions, and the implementation of the seal disc. The pneumatic tests of the fabricated pulse separation devices showed that the rupture pressure increased as the quantity of the rupture disc slit and welding strength increased and the seal disc was implemented.

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Temperature Effect on the Retention Behavior of Sugars in Ion Exchange Chromatography (이온 교환 크로마토그래피에서 온도가 당의 체류 특성에 미치는 영향)

  • Kim, Jin-Il;Lee, Chong-Ho;Koo, Yoon-Mo
    • Korean Chemical Engineering Research
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    • v.43 no.6
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    • pp.722-727
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    • 2005
  • Dow99Ca350 (Dowex monosphere 99Ca/350 separation resin), MFG-220, and Finex CS-10GC are ion-exchange resins, and primarily used to separate sugars, and all of these resins have poly styrene DVB backbone, and sulfonyl group. These resins are already used to separate sugars continuously at sugar industry at constant temperature. These resins are used in experiments for understanding temperature effect on retention or adsorption behavior. Using Dow99Ca350, swelling test, porosity test, pulse test, and frontal analysis at various temperatures were performed. In the cases of MFG-220, and Finex CS-10GC, the effect of temperature variation was verified by pulse test. The experimental results are shown that Dow99Ca350, MFG-220, and Finex CS-10GC, which are commercial resins for sugar separation, are stable to temperature variation because the maximum change of retention time of fructose, and glucose are 1.76, and 3.37% respectively.

A Study on Steady-State Simulation and Experimental Test of Small Turbo Shaft Engine with Free Power Turbine (분리축 방식 소형 터보축 엔진의 정상상태 모사 및 실험연구)

  • 공창덕;기자영;고광웅
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 1997.11a
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    • pp.23-23
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    • 1997
  • 다목적으로 활용할 수 있는 분리축 방식의 터보축 엔진 개발을 위한 정상상태 해석 프로그램의 개발과 함께 동일 형식의 가스터빈엔진 시험장치를 이용한 실험을 통해 프로그램의 해석결과와 비교, 그 타당성을 입증하였다. 실험에 이용된 시험장치는 1단 원심형 압축기, Can형 연소기, 1단 Radial형 압축기 터빈 및 동력터빈으로 구성되어 있으며 출력은 3상 교류발전기를 통해 획득된다. 해석에 사용된 주요 구성품의 성능곡선은 시험장치 제작자로부터 획득된 자료를 이용하였으며, 경우에 따라 시험장치를 이용한 실험을 통하여 보정하였다. 시험장치를 이용한 실험결과를 프로그램 해석결과와 비교한 결과, 시험장치의 운용제한에 의해 실제 자동영역이 제한되기는 했으나, 압력비, 출력 등 주요 변수들에서 10% 미만의 오차를 보였다.

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