• Title, Summary, Keyword: Maintenance

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Optimum Maintenance Strategy of Bridges Based on System Reliability (시스템 신뢰성에 기초한 교량의 최적 유지관리 계획)

  • Yang, Seung Ie
    • Journal of Korean Society of Steel Construction
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    • v.14 no.5
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    • pp.627-639
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    • 2002
  • Bridge construction is almost complete in many countries. Thus, the government and highway agencies change their focus from constructing to maintaining. Effectively maintaining bridges require predicting their lifespan using a system reliability viewpoint. Likewise, maintenance models based on the system reliability concept should be developed. Thus, this study developed maintenance models for preventive maintenance and essential maintenance using system reliability and lifetime distributions. The optimal maintenance strategy for an existing bridge was obtained using the developed maintenance models.

A Study on the Evaluation of Maintenance Capability for A Maintenance Battalion in the Mechanized Division (기계화사단 정비대대 능력 평가에 관한 연구)

  • 백종찬;강성진
    • Journal of the military operations research society of Korea
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    • v.22 no.1
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    • pp.142-155
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    • 1996
  • In this research, our objective is to develop a model which could evaluate the maintenance capability for a maintenance battalion in the mechanized division. To analyze the maintenance system, we obtained various data related to maintenance capability and described the maintenance process as a network type. This network type model is then translated to SLAM-II network model to simulate the system. The simulation model can be operated by using appropriate input data and simulation results are obtained. The simulation model can be applied in various way. Through the simulation we could find the bottle neck point in the maintenance process. Also the maximum capability of maintenance with on hand asset and the wartime supportability can be evaluated. The mode provides sensitivity analysis by changing various imput data such as the number of repairmen, repair time, failure rate and so on.

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A Study on the Development of Integrated Maintenance System to Improve the Operational Availability for Underwater Guided Weapon (수중유도무기의 운용가용도 향상을 위한 통합정비체계 개발에 관한 연구)

  • Shin, J.H.;Kim, H.G.;Yun, W.Y.
    • Korean Management Science Review
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    • v.23 no.2
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    • pp.137-159
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    • 2006
  • Maintenance equipments, tools, manuals and documents are needed to maintain weapon systems. At the time, a lot of technical materials are maintained and used individually at various places and organizations. Thus, maintenance engineers can rot get the necessary informations quickly and the efficiency of maintenance is low. In this paper, first we analyze maintenance processes in weapon systems and define the total measure to evaluate the maintenance efficiency of weapon systems. Second, we propose an implementation procedure to integrated maintenance system.

A Study on the Effectiveness of the Depot Maintenance: Based on the Maintenance Data of K-1 Main Battle Tank Since 2010 (창정비의 실효성에 대한 고찰: K-1 전차의 2010년 이후 정비자료를 바탕으로)

  • Kim, Heongil;Park, Jaehun;Sung, Si-Il
    • Journal of Applied Reliability
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    • v.17 no.3
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    • pp.256-263
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    • 2017
  • Purpose: This article provides the efficiency test results of conducting depot maintenance. Method: ANOVA (analysis of variance) and ANCOVA (analysis of covariance) tests are conducted using data obtained from Defense Logistics Integrated Information System (DELIIS). Results: The result shows that although the effect of the depot maintenance is significant, some parts do not follow the overall effect of the depot maintenance. In order to solve the problem we provide some suggestions to be improved. Conclusion: For improving the combat readiness condition of K-1 main battle tank, the maintenance policies and regulation must be revised for the parts of the weakness. In addition, the collection way of the operation and maintenance data must be redesigned.

A study on the efficient maintenance interval for the rolling-stocks (철도차량의 효율적인 정비주기에 관한 연구)

  • Yu, Yang-Ha;Jung, Jin-Tae;Kim, Ho-Soon;Kim, Dae-Sik
    • Proceedings of the KSR Conference
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    • pp.1612-1617
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    • 2011
  • Rolling stock needs many maintenance works because of its long service life. The maintenance of rolling stock has periodic preventive maintenance system. This periodic preventive maintenance system can't reflect the characteristics of every part. The condition-based maintenance system which reflects the functional condition of every part prevents breakdown and reduces maintenance cost. This study will analyze the records of every part by unreasonable examples of time-based preventive maintenance and reliability management activities, and discuss the necessity of maintenance system reflected the results.

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A Study on Optimal Preventive Maintenance Policy When Failure Rate is Exponentially Increasing After Repair (수리 후 고장률이 지수적으로 증가하는 경우에 최적 예방보전 정책)

  • Kim, Tae-Hui;Na, Myung-Hwan
    • Journal of Applied Reliability
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    • v.11 no.2
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    • pp.167-176
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    • 2011
  • This paper introduces models for preventive maintenance policies and considers periodic preventive maintenance policy with minimal repair when the failure of system occurs. It is assumed that minimal repairs do not change the failure rate of the system. The failure rate under prevention maintenance received an effect by a previously prevention maintenance and the slope of failure rate increases the model where it considered. Also the start point of failure rate under prevention maintenance considers the degradation of system and that it increases quotient, it assumed. Per unit time it bought an expectation cost from under this prevention maintenance policy. We obtain the optimal periodic time and the number for the periodic preventive maintenance by using Nakagawa's Algorithm, which minimizes the expected cost per unit time.

Development direction for Korea track management system with analyzing overseas instances (해외사례 고찰을 통한 한국형 궤도관리 시스템 개발 방향)

  • Woo, Byoung-Koo;Lee, Choon-Kil;Park, Hyun-Woo;Yang, Ki-Hoon;Lee, Sung-Uk
    • Proceedings of the KSR Conference
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    • pp.358-368
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    • 2007
  • At this current, KORAIL track maintenance system has been worked with the method of corrective maintenance which is repaired some location exceeded the track management criteria as a result of track measurement. It brings about a lot of additional expenses that the corrective maintenance might be a way of missing an appropriate maintenance time, after occurring some trouble on the track due to track maintenance characteristic. We sincerely need a track maintenance system including the concept of preventive maintenance that track is corrected with predicting the trend of track irregularity. I would like to present a development direction for Korea track maintenance system having a good application in our track with analyzing TRAMS21 and RAMSYS as overseas railway company has operated a track maintenance system.

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Development of the Preventive Maintenance System for an Urban Transit (도시철도 차량을 위한 예방보전시스템 개발)

  • Ha, Seong-Hoon;Chang, Suk-Hwa;Yoo, Woo-Sik
    • Journal of the Society of Korea Industrial and Systems Engineering
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    • v.30 no.1
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    • pp.1-7
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    • 2007
  • This paper addresses a the maintenance system based on the concept of RAMS (Reliability, Availability, Maintenance, Safety) for the effective maintenance of the urban transit. A systematic approach for developing a cost-effective maintenance strategy based on the component reliability of the system in question is performed according to the following steps : definition of function, functional failures of the systems, construction of RBD (Reliability Block Diagram), and the calculation of reliability indices. The developed preventive maintenance system generates maintenance plan and repair request based on the analysed RAMS data of components and maintenance experience.

Establishment of Preventive Maintenance Planning for Generation Facility Considering Cost (비용을 고려한 발전설비의 예방유지보수 계획 수립)

  • Kim, Hung-Jun;Shin, Jun-Seok;Kim, Jin-O;Kim, Hyung-Chul
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • pp.328-333
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    • 2007
  • Traditional maintenance planning is based on a constant maintenance interval for equipment life. In order to consider economic aspect for tm based preventive maintenance, preventive maintenance is desirable to be scheduled by RCM(Reliability-Centered Maintenance) evaluation. The main objective of RCM is to reduce the maintenance cost, by focusing on the most important functions of the system and avoiding or removing maintenance actions that are not strictly necessary. So, Markov state model is utilized considering stochastic state in RCM In this paper, a Markov state model much can be used for scheduling and optimization of maintenance is presented. The deterioration process of system condition is modeled by the stepwise Markov model in detail. Also, because the system is not continuously monitored, the inspection is considered. In case study, simulation results about RCM will be shown using the real historical data of combustion turbine generating unit in Korean power systems.

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The Optimal Maintenance Strategy of a Rail Bridge by Using Life Cycle Cost (생애주기 비용을 이용한 철도교량의 최적유지관리)

  • Yang Seung-le
    • Journal of the Korean Society for Railway
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    • v.8 no.6
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    • pp.544-549
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    • 2005
  • Nowadays, most of bridge networks are complete or close to completion. The biggest challenge railroad./highway agencies and departments of transportation face is the maintenance of these networks, keeping them safe and serviceable, with limited funds. To maintain the bridges effectively, there is an urgent need to predict their remaining life from a system reliability viewpoint. And, it is necessary to develop the maintenance models based on system reliability concept. In this paper, maintenance models are developed for preventive maintenance and essential maintenance by using system reliability and lifetime distributions. The proposed model is applied to an existing railroad bridge. The optimal maintenance strategy of this bridge is obtained in terms of services life extension and cumulative maintenance cost.