• Title, Summary, Keyword: accelerated storage

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A Study on Suitable Condition of Accelerated Aging Test and Evaluation Criteria of Data Stability for Archival Performance Analysis of BD-R media (BD-R 장기보존 특성 평가를 위한 가속 열화 실험 조건과 안정성 평가 기준에 관한 연구)

  • Lee, Kwan-Yong;Park, Sun-Joo;Kim, Do-Hyun;Jo, Yi-Hyung;Kim, Young-Joo
    • Transactions of the Society of Information Storage Systems
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    • v.10 no.1
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    • pp.7-13
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    • 2014
  • The Blu-ray Disc Recordable(BD-R) is one of strong candidates for archival application among optical media formats, because of its large capability. However, the well-defined accelerated aging test conditions and evaluation criteria have not yet been fully confirmed for BD-R. In this study, the data stability and degradation aspect of BD-R were analyzed by the random-symbol error rate(R-SER) measurement after the accelerated aging test. And a reasonable test condition of accelerated aging for BD-R and the appropriate evaluation criterion using R-SER measurement were discussed.

Storage Reliability Evaluation of Engine Assembly (엔진 조립체의 저장 신뢰도 평가)

  • Park, Jong-Won;Chang, Mu-Seong;Park, Tae-Kook;Kim, You-Il;Kim, Sun Je
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.157-159
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    • 2017
  • This paper presents a storage reliability evaluation method based on the accelerated degradation test for the engine assembly and parts of the guided missile. The test of the engine assembly is performed at accelerated conditions equivalent to the real storage period, and then the aging condition of parts is checked. For engine parts, performance degradation characteristics are measured periodically at the accelerated conditions and failure times are predicted at each condition. Storage lifetime at normal use conditions is predicted using an accelerated model and failure times at all accelerated conditions.

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Storage lifetime estimation of detonator in Fuse MTSQ KM577A1 (기계식 시한 신관 KM577A1용 기폭관 저장수명 예측)

  • Chang, Il-Ho;Park, Byung-Chan;Hwang, Taek-Sung;Hong, Suk-Whan;Back, Seung-Jun;Son, Young-Kap
    • Journal of the Korean Society for Quality Management
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    • v.38 no.4
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    • pp.504-511
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    • 2010
  • A fuze detonator comprising star shells is an important device so that its failure usually leads to failure of the shells. In this paper, accelerated degradation tests of RD1333 (lead azide) using temperature stress were performed, and then degradation data of explosive power for the detonator were analyzed to predict the storage lifetime of detonator. Degradation data analysis to estimate the storage lifetime is based on a distribution-based degradation process. Statistical distribution parameters of explosive power degradation measures at each time were estimated for each temperature level, and then reliability of the detonator for each accelerated temperature level was estimated using both time-varying distribution parameters and critical level of explosive power. Arrhenius model was applied to estimate storage lifetime of the detonator under the field temperature condition. Accelerated distribution-based degradation analysis to estimate storage lifetime is explained in detail, and estimation results are compared to field data of storage lifetime in this paper.

Storage Life Estimation of Next Infrared Flare Material (차기 적외선 섬광제 저장수명 예측)

  • Back, Seungjun;Son, Youngkap;Kim, Namjin;Kwon, Taesoo
    • Journal of the Korea Institute of Military Science and Technology
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    • v.19 no.3
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    • pp.311-318
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    • 2016
  • This paper shows storage life estimation of next IR(infrared) flare material through accelerated degradation tests. Three temperature conditions for the accelerated degradation tests are 55, 65 and $75^{\circ}C$. Six performances of IR flare material are burning time, IR peak/continuous Intensity, total energy of near/mid-IR and color ratio, and they were measured after the tests. Storage life of the IR flare material was estimated through both analyzing the degradation data of those performances and applying distribution-based degradation models to the data. Over 30 years of storage life at $20^{\circ}C$ is estimated in terms of IR peak intensity with reliability 0.99 and confidence level 99 %. Additionally, 10 years of storage period at $21^{\circ}C$ would be equivalent to 68 days of accelerated test at $65^{\circ}C$ from the activation energy in Arrhenius model.

Storage Life Evaluation of a Violet Smoke Hand Grenade(KM18) using Degradation Data (열화데이터를 이용한 자색 연막수류탄(KM18)의 저장수명 평가)

  • Chang, Il-Ho;Hong, Suk-Hwan;Jang, Hyun-Jeung;Son, Young-Kap
    • Journal of the Korea Institute of Military Science and Technology
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    • v.15 no.2
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    • pp.215-223
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    • 2012
  • A violet smoke hand grenade(KM18) is used to generate signals. The grenade is considered to fail when its smoke emission time is longer than the specified one so that its smoke concentration becomes lighter. Accelerated degradation test for the grenade was performed, and then failure in smoke emission time was reproduced from the test. Stress for the degradation test was selected as temperature/humidity from the pre-test results. Degraded data of emission time from the accelerated test were analyzed through applying a distibution-based degradation model. Then, Peck Model was applied to predict the storage life under field conditions. In addition, the predicted storage life was compared with that of ASRP(Ammunition Stockpile Reliability Program).

A Study on the Storage Life Estimation Method for Applying Gamma Process Model to Accelerated Life Test Data (가속수명시험 자료에 감마 과정 모델을 적용한 저장 수명 예측 기법 연구)

  • Park, Sungho;Kim, Jaehoon
    • Journal of the Korean Society of Propulsion Engineers
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    • v.17 no.3
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    • pp.30-36
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    • 2013
  • This paper presents a method to estimate a storage life for loss of stabilizer content as storage periods using accelerated life test data. The estimate of storage life based on deterministic accelerated life test and degradation data cannot describe a condition distribution and storage life distribution. Previously, the method to show the condition distribution and storage life distribution by using gamma process has been studied. But it has limitation because it is impossible to collect the deterioration data at initial production phase. The estimated storage life presented by this study shows the similar value to previous studies and the method can describe the condition distribution and storage life distribution. So, the estimation method studied in this paper can be used for a life cycle management about deterioration of propellant for propulsion unit or components of missile, too.

Storage Life Estimation of Magnesium Flare Material for 81 mm Illuminating Projectile (81 mm 조명탄용 마그네슘계 조명제 저장수명 예측)

  • Back, Seungjun;Son, Youngkap;Lim, Sunghwan;Myung, Inho
    • Journal of the Korea Institute of Military Science and Technology
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    • v.18 no.3
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    • pp.267-274
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    • 2015
  • It is necessary to both analyze root-cause of non-conformance of effective illumination time to the specification, and estimate the storage lifetime for 81 mm illuminating projectile stockpiled over 10 years. In this paper, aging mechanism of magnesium flare material due to long-term storage was supposed, and two-stage tests, pre-test and main test based on accelerated degradation tests were performed. Field storage environment of moistureproof was set up, and illumination times in the accelerated degradation tests for temperatures 60 and $70^{\circ}C$ were measured. Then, storage reliability of the projectile was estimated through analyzing the measured data and applying distribution-based degradation models to the data. The $B_{10}$ life by which 10 % of a population of the projectiles will have failed at storage temperature of $25^{\circ}C$ was estimated about 7 years.

Efficient Process Control Through Research on Storage Lifetime of a White Smoke Hand Grenade, KM8 (저장수명 연구를 통한 백색 연막수류탄(KM8)의 공정관리 효율화)

  • Chang, Il-Ho;Hong, Suk-Hwan;Back, Seung-Jun;Son, Young-Kap
    • Journal of the Korea Institute of Military Science and Technology
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    • v.14 no.5
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    • pp.888-896
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    • 2011
  • A white smoke hand grenade, KM8 is used to make smoke screen in order to provide visual field interceptions or signals. The grenade fails when its time to emit smoke is longer than the specified emission time so that the smoke concentration becomes lighter. This paper considered failure in smoke emission time, and evaluated its storage lifetime. The main objective of this paper is to modify the present specification limits of smoke emission time for the efficient process control in manufacturing, through analyzing effect of its specification change on the storage lifetime, based on the lifetime evaluation results. Accelerated degradation test was performed and then failure in smoke emission time was reproduced from the test. And estimated storage lifetimes from the accelerated test results was compared to evaluated lifetimes of grenades using the ASRP data. Past process testing results of the grenade in manufacturing were analyzed in this paper. Then, each storage lifetime for the specifications, ${\pm}3$ and ${\pm}5$ in seconds, extended from the current specification in manufacturing were estimated using the past testing results, and compared to one another.

A Study on the Shelf-life Prediction of the Single Base Propellants Using Accelerated Aging Test (가속노화시험을 이용한 단기추진제의 저장수명예측에 관한 연구)

  • Lee, Jong-Chan;Yoon, Keun-Sig;Kim, Yong-Hwa;Cho, Ki-Hong
    • Journal of the Korean Society for Quality Management
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    • v.35 no.2
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    • pp.45-52
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    • 2007
  • The danger of self-ignition of single base propellants will increase with time. Therefore, a good prediction of the safe storage time is very important. In order to determine the remaining shelf-life of the propellants, the content of stabilizer is determined. The propellants stored under normal storage conditions about 10 to 18 years were investigated and accelerated aging test was carried out by storing propellant sample at higher temperature. Finally, we analyzed the results by various methods in order to show the best way to predict the realistic shelf-life. The safe storage life of the propellants will be 24 years, at least 15 years. In case of applying Arrhenius's law, using the reaction rate constant at 28$^{\circ}C$ to 30$^{\circ}C$ to predict the shelf-life by accelerated aging test is reasonable for a good prediction.

Storage Reliability Assessment of Springs for Turbo Engine Components (터보엔진 구성품용 스프링의 저장 신뢰성 평가)

  • Chang, Mu-Seong;Lee, Choong-Sung;Park, Jong-Won;Kim, You-Il;Kim, Sun Je
    • Journal of the Korean Society of Propulsion Engineers
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    • v.23 no.4
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    • pp.42-49
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    • 2019
  • This paper presents a method to predict the storage reliability of springs for turbo engine components based on an accelerated degradation test. The reliability assessment procedure for springs is established to proceed with the accelerated degradation test. The spring constant is selected as the performance degradation characteristic, the temperature is determined to be the stress factor that deteriorates the spring constant. The storage tests are performed at three temperature test conditions. The spring constant is measured periodically to check the degradation status of the springs. Failure times of the springs are predicted by using the degradation model. Finally, the storage lifetime of the springs at normal use conditions is predicted using an accelerated model and failure times of all test conditions.