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필드데이터에 의한 철도차량 신호장치 구성품의 최적 교체주기 결정에 관한 연구
박병노,김경화,김재훈 한국안전학회 2023 한국안전학회지 Vol.38 No.2
Rolling stock maintenance, which focuses on preventive maintenance, is typically implemented considering the potential harm that may be inflicted to passengers in the event of failure. The cost of preventive maintenance throughout the life cycle of a rolling stock is 60%–75% of the initial purchase cost. Therefore, ensuring stability and reducing maintenance costs are essential in terms of economy. In particular, private railroad operators must reduce government support budget by effectively utilizing railroad resources and reducing maintenance costs. Accordingly, this study analyzes the reliability characteristics of components using field data. Moreover, it resolves the problem of determining an economical replacement interval considering the timing of scrapping railroad vehicles. The procedure for determining the optimal replacement interval involves five steps. According to the decision model, the optimal replacement interval for the onboard signal device components of the “A” line train is calculated using field data, such as failure data, preventive maintenance cost, and failure maintenance cost. The field data analysis indicates that the mileage meter is 9 years, which is less than the designed durability of 15 years. Furthermore, a life cycle in which the phase signal has few failures is found to be the same as the actual durability of 15 years.
강도-응력 간섭모델을 적용한 철도차량용 차륜의 피로강도 및 신뢰성 평가법
박병노,김기환,김호경 한국철도학회 2002 한국철도학회논문집 Vol.5 No.2
The failure probability of wheel beyond 107 cycles is achieved by the strengths-stress interference model for the evaluation of fatigue strength and reliability in the wheel, From plane bending fatigue test results, the fatigue life (Nf) for the smooth and 200㎛ holed specimens can be represented as sigma_a ~=~ 1326 N_f ^{~-0.10}
박병노(Park Byoung-Noh),주해진(Joo Hae-Jin),이창환(Lee Chang-Hwan),임성수(Lim Sung-Soo) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.5월
FMEA(Failure Mode and Effect Analysis) is a failure analysis method for the system to identify the potential failure modes, and their effects and causes to reduce or mitigate the critical effects of the system. FMEA for railway was introduced with reliability of railway system, and this was used for identifying and analysing the possible hazards qualitatively to meet the requirements in early stage of business. In general, the overall failure data of system could be managed from design stage by FMEA, and also the countermeasures to prevent many predicted failures could be established by identification of failure modes and assement of failure effects by FMEA. Using these advantages of FMEA, the effectiveness of reliability improvement could be expected if FMEA is applied continuously in operation stage. It is essential that railway vehicles are maintained with high level of safety and reliability not to happen any failures in operation. This paper is proposed the proper FMEA for maintenance of railway vehicles compared with existing FMEA.
강도-응력 간섭모델을 적용한 철도차량용 차륜의 피로강도 및 신뢰성 평가법
박병노(Byoung-No Park),김기환(Ki-Hwan Kim),김호경(Ho-Kyung Kim) 한국철도학회 2002 철도저널 Vol.5 No.2
The failure probability of wheel beyond 10<SUP>7</SUP> cycles is achieved by the strengths-stress interference model for the evaluation of fatigue strength and reliability in the wheel, From plane bending fatigue test results, the fatigue life (Nf) for the smooth and 200㎛ holed specimens can be represented as σa = 1326Nf<SUP>-0.10</SUP> and σa = 2894Nf<SUP>-0.18</SUP>. Respectively, fatigue strength of the wheel at beyond 10<SUP>7</SUP>cycles was about 332 MPa. And, the fatigue strength for the specimen with a micro hole (d=200㎛) which simulated an inclusion on the wheel surface was about 235 MPa. Thus, a micro hole (d=200㎛) caused about 30% reduction of fatigue strength of the specimen. The failure probabilities for the smooth and micro-holed specimens, derived from the strength-stress interference model, are 0.0148% and 13.05%, respectively. The current finding suggests that at least 200㎛ sized inclusion, which might be produced during manufacturing process, will cause a critical effect on integrity of the railway vehicle.
박병노(Park Byoung-Noh),주해진(Joo Hae-Jin),이창환(Lee Chang-Hwan),임성수(Lim Sung-Soo) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
Railway vehicle is very important to implement the effective maintenance in proper to prevent any failure during operation period. Many railway authorities are making efforts to maintain the railway vehicle through scientific and systematic procedure. To achieve this, Reliability Centered Maintenance(RCM) is partially applied. The efficiency of RCM has proven and its terminology was familiar with nuclear power, military and chemical plant etc. since the commercial aircraft"s industries has introduced the maintenance program based on the target of reliability. The application of RCM on railway vehicle can be utilized with systematic analysis method to select the best effective maintenance period and action to prevent the failures by selecting the equipment affecting the its safety and reliability. This paper is presented that the procedure of adequate and effective maintenance for railway vehicle by comparing among the related standards in example IEC60300-3,11, MIL-STD-2173, and technical documents or papers. In accordance with above result, RCM procedure is proposed to apply effectively for maintenance of railway vehicle. That is, (1) Analysis of data and Calculation of criticality per equipment (2) Selection of equipment to analyze (3) Analysis of failure mode and effect (4) Evaluation of maintenance method and period (5) Optimization of maintenance program through renewal of maintenance method and period.