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김도식(Do-Sik KIM),이승훈(Seung-Hun Lee),유영철(Yung-chul Yoo),김형의(Hyoung-Eui Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
In this study, we are to analyze the life and the main failure mode of ball screw that are usually applied to the Machine tools. Ball screw have complicated failure cause since they are organized as a complex of various elements. Therefore, in this paper, we analyzed the main failure mode of ball screw, and then performed life test and performance test according to the international standards. On the basis of these processes, we estimated a shape parameter that is the main factor for the calculation of test time for the reliability of ball screw by analyzing life distribution data.
독립현가형 AWD 차량의 구동축 가속 수명 평가에 관한 연구
김도식(Do Sik Kim) 한국신뢰성학회 2011 신뢰성응용연구 Vol.11 No.4
This paper proposes an accelerated life evaluation of drive shaft. The life test of drive shaft for independent suspension type AWD vehicle should be performed by use of the least test sample because many number of samples can"t be used for the test because of its mass capacity and high price. We calculated the no failure test time by application of no failure test concept, and the already performed test data for drive shaft are applied for some kinds of reliability coefficients which are needed for calculation of life test time. And, for analysis of real driving condition of vehicle, the load spectrum is prepared using the needed road condition and vehicle data. The inverse power model is used for accelerated life test. The equivalent torque of load spectrum is achieved by use of Miner"s Rule, and then the final accelerating condition is determined by decision of the accelerated test torque. This paper shows that the accelerated life test results corresponds with the target life and the proposed life test method can be very well applied to no failure life test for mass capacity machinery components.
김도식(Do-Sik Kim),김형의(Hyoung-Eui Kim),윤성한(Sung-Han Yoon),강이석(E-Sok Kang) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.3
본 논문은 교정가속수명시험법을 이용하여 액슬구동축의 피로수명을 예측하는 법을 제안한다. 교정가속 수명시험법은 수명예측, 시험시간 절감, 신뢰성 정량화시에 매우 효과적이다. 피로시험은 두 개의 고 부하 수준과 한 개의 저 부하 수준에서 수행되고, 외삽법을 사용하여 사용수준에서의 수명시간을 예측하게 된다. 본 논문에서는 수행시험 결과로부터 획득한 수명시간, 가속지수, 형상모수, 척도모수등과 같은 주요 신뢰성 인자들을 보여주고 있다. 액슬구동축의 수명예측은 부하스펙트럼 데이터와 시험데이터와의 비교 연구를 수행하여 검증하였다. 교정가속수명시험법을 사용한 수명예측법은 짧은 시간내에 수명을 예측하는데 매우 효과적인 방법임을 확인하였다. In this paper, a method to predict the fatigue life of an axle drive shaft by the calibrated accelerated life test (CALT) method is proposed. The CALT method is very effective for predicting lifetimes, significantly reducing test time, and quantifying reliability. The fatigue test is performed by considering two high stress and one low stress levels, and the lifetime at the normal stress level is predicted by extrapolation. In addition, in this study, the major reliability parameters such as the lifetime, accelerated power index, shape parameter, and scale parameter are determined by conducting various experiments. The lifetime prediction of the axle drive shaft is verified by comparing the experimental results with load spectrum data. The results confirm that the CALT method is effective for lifetime prediction and requires a short test time.
김도식(Do-Sik Kim),성백주(Baek-Ju Sung) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
This paper propose a way to predict the fatigue life of an propeller shaft using accelerated life test method. The calibrated accelerated life test method is very effective for the lifetime prediction, significant reduction of test time and quantification of reliability. The fatigue test was performed by use two high stress level and one low stress level, and the lifetime at normal stress level was predicted through extrapolation. In addition, this paper presents the major reliability parameters like the lifetime, the accelerated power index, the shape parameter, the scale parameter which achieved as the results of various experiments. The lifetime prediction of propeller shaft is verified through the comparison study of experiments results with load spectrum data.
김도식(Do-Sik Kim),김도형(Do-Hyung Kim),김우성(Woo-Sung Kim),이두화(Du-Hwa Lee),이호석(Ho-Seok Lee) 한국암반공학회 2006 터널과지하공간 Vol.16 No.5
최근 신설철도가 계획되거나 선형개량공사가 증가함에 따라 터널 구조물이 장대화되고 있다. 장대터널에서 터널내 열차화재 등이 발생하는 경우 대형사고를 초래할 수 있으므로 터널 방재에 대한 관심이 증가하고 있으며, 이에 따른 터널 방재기준도 더욱 강화되고 있는 실정이다. 따라서 터널계획시 방재기준을 만족하면서 위험도를 최소화할 수 있는 최적 방재시설물 계획이 요구되고 있다. 이와 같이 합리적인 장대터널 방재 설계를 위해서는 열차사고 통계분석 및 피난시뮬레이션을 기초로 한 보다 객관적이며, 정량적인 평가가 필요하다 할 수 있으며, 이를 위해서 본 연구에서는 정량적 위험도 분석기법인 QRA (Quantitative Risk Assessment)를 철도터 널에서의 방재설계에 적용하고자 하였다. 대상터널은 연장 약 4.1 ㎞의 산악터널(사례 Ⅰ)과 연장 약 3.6 ㎞인 도시지역터널(사례 Ⅱ)로서 두 터널 모두 철도터널 관련 방재기준보다 향상된 터널방재성능이 요구되어, 도시지역 안전기준에 만족하는 합리적인 터널내 방재구조물 계획을 수립하기 위하여 정량적 위험도분석을 실시하였다. 장대터널에서의 갱외탈출로 개념의 사갱 및 수직구 계획을 수립하기 위하여 각각의 경우에 대한 QRA를 실시하고, 장대터널의 방재 안정성을 평가함으로써 실행 가능한 합리적인 수준의 터널 방재설계를 수행하고자 하였다. Recently, as the construction of new railway and the relocation of existing line increase, tunnel structures grow longer. The railway fire accidents in long tunnel bring large damages of human life and disaster. The interest of safety in long tunnel have a growing and the safety standard of long tunnel is tightening. For that reason, at the planning of long tunnel, the optimum design of safety facility in long tunnel for minimizing the risks and satisfying the safety standard is needed. For the reasonable design of long railway tunnel considering high safety, qualitative estimation for tunnel safety is required. In this study, QRA (Quantitative Risk Assessment) technique is applied to design of long railway tunnel for assuring the safety function and estimating the risk of safety. The case study for safety design in long railway tunnel is carried out to verifying the QRA technique for two railway tunnels. Thus, the inclined and vertical shaft for escape way and safety facilities in long tunnel are planned, and the risks of tunnel safety for each case are estimated quantitatively.