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축열조 캡슐 고장원인 분석과 수명시험 모드 결정에 관한 연구
강보식(Bosik Kang),이용범(Yongbum Lee),정동수(Dongsoo Jung),이충성(Chungsung Lee) 한국신뢰성학회 2018 신뢰성응용연구 Vol.18 No.3
Purpose: The purpose of this study is to evaluate the life of the capsule, which is a core part of the heat storage cooling system. This paper will develop a life test mode that can reproduce environment conditions through the analysis of capsule shrinkage and expansion characteristics. Methods: In order to determine the life test mode of the capsule, this paper analyzed the case of field failures and analyzed the deformation characteristics according to the pressure fluctuation of the capsule. The method to find out whether the field failure and deformation analysis results are consistent is the testing with the construction of the repetition pressure test equipment and the thermal cycle test to reproduce the freezing and thawing characteristics. Results: In this study, failure mode analysis and analysis of freezing and thawing characteristics regarding to the capsule positions were completed. Based on this test & analysis results, this paper have been able to determine the main parameters for determining the life test mode, the freezing and thawing time. Conclusion: Determining the lifetime mode of the capsule can be used to improve the life and performance of the thermal storage system.
이충성(Choongsung Lee),강보식(Bosik Kang),이원균(Wonkyun Lee) 한국신뢰성학회 2021 신뢰성응용연구 Vol.21 No.4
Purpose: Condensation water, generated with high temperature and humid air, decreases the reliability of electronic devices. Therefore, this paper compares the experimental results of condensation water and the simulation results. Methods: To measure the amount of condensation water, experiments were conducted on a miniature water tank. Antoine and Wagner equations were used to predict the amount of condensation water analytically. Results: On comparison of measured values with those obtained from Antoine equation, a difference of 12.4∼4.8% was measured, while it was 12.1~4.5% in the case of Wagner equation. Conclusion: It is deduced that the reliability period can be shortened by applying various simulations to the design of electronic devices.
와이블-역승법을 이용한 기계류부품의 가속시험 방법 개발
이근호(Geunho LEE),김형의(HyoungEui KIM),강보식(BoSik KANG) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
This study was performed to develop the accelerated life test method using Weibull-IPL(Invcrse Power Law) model for mechanical components. Weibull-IPL model is concerned with determining the assurance life with confidence level and the accelerated life test time. From the relation of weibull distribution factors and confidence limit. the testing times on the no number of failure acceptance criteria are determined. The mechanical components generally represent wear and fatigue characteristics as a failure mode. IPL based on the cumulative damage theory is applied effectively the mechanical components to reduce the testing time and to achieve the accelerating test conditions. As the actual application example. accelerated life test method of agricultural tractor transmission was described. Life distribution of agricultural tractor transmission was supposed to follow Weibull distribution and life test time was calculated under the conditions of average life (MTBF) 3,000 hours and 90% confidence level for one test sample. According to IPL, because test time can be shorten in case increase test load. test time could be reduced by 482 hours when we put the load 1.1 times of rated load than 0.73 times of rated load that is equiva1ent load calculated by load spectrum of the agricultural tractor. This time, acceleration coefficient was 11.7.
스윕 가스-진공 하이브리드식 탈기막 공정을 활용한 암모니아 폐수처리 및 선택적 회수
윤홍식 ( Hongsik Yoon ),민태진 ( Taijin Min ),전민규 ( Minkyu Jeon ),임성일 ( Sungil Lim ),오세철 ( Sechul Oh ),류경하 ( Kyungha Ryu ),이충성 ( Chungsung Lee ),강보식 ( Bosik Kang ) 한국산업융합학회 2023 한국산업융합학회 논문집 Vol.26 No.6
In this study, a sweep gas - vacuum hybrid type membrane degassing process was proposed for ammonia wastewater treatment. In addition, the ammonia selective recovery of the hybrid type membrane degassing process was also investigated. As a result, the hybrid type membrane degassing process showed better degassing performance (54.9 mg NH<sub>3</sub>/m<sup>2</sup>min for 360 min) than the sweep gas type (32.3 mg NH<sub>3</sub>/m<sup>2</sup>min) or vacuum type (22 mg NH<sub>3</sub>/m<sup>2</sup>min). Additionally, the hybrid type membrane degassing process showed an excellent ammonia selectivity (103 times compared to Na<sup>+</sup>, 133 times compared to Ca<sup>2+</sup>). The ammonia selectivity was appeared to be due to the conversion characteristics of ammonium ion / dissolved ammonia depending on pH. The results in this study are expected to be used in the development of ammonia wastewater treatment and ammonia recovery in the future.