• Title, Summary, Keyword: Maintenance

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A Study on the Maintenance Management in Korean Industry (국내 제조업의 보전관리에 관한 조사연구)

  • 강인선
    • Journal of the Society of Korea Industrial and Systems Engineering
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    • v.21 no.45
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    • pp.247-251
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    • 1998
  • From the early 90's TPM(Total Productive Maintenance) plays important roles to improve productivity and quality to keep enterprise's competivity. This study presents the results of an enquiry for the maintenance management of Korean industry in 1996. The response rate was 35.8% (43 companies) that the corporations were divided into four industrial groups, heavy process, light process, heavy assembly and light assembly. 40 question were asked, including maintenance organization, maintenance personnel, maintenance cost, measurement of maintenance performance and improvements achieved. This paper compares the results with those of an earlier Japanese and British enquiry.

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Failure Prediction Reliability Model based on the Condition-based Maintenance (CBM기반의 고장 예측 신뢰성 모델)

  • 김연수;정영배
    • Journal of the Society of Korea Industrial and Systems Engineering
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    • v.22 no.52
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    • pp.171-180
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    • 1999
  • Industrial equipment reliability improvement and maintenance is gaining attention as the next great opportunity for manufacturing productivity improvement. Reactive maintenance is expensive because of extensive unplanned downtime and damage to machinery. To avoid such an unplanned machine downtime, it is needed to use proactive maintenance approach by either using historical maintenance data or by sensing machine conditions. This paper discusses failure diagonosis and prediction based on the condition-based maintenance and reliability technique. Thus, by enabling such a framework, it can bring us more efficient planning and execution of maintenance to reduce costs and/or increase profits.

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Preventive maintenance policy following the expiration of replacement-repair warranty (교체-수리보증이 종료된 이후의 예방보전정책)

  • Jung, Ki-Mun
    • Journal of Applied Reliability
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    • v.12 no.2
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    • pp.57-66
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    • 2012
  • In this paper, we consider the periodic preventive maintenance model for a repairable system following the expiration of replacement-repair warranty. Under this preventive maintenance model, we derive the expressions for the expected cycle length, the expected total cost and the expected cost rate per unit time. Also, we determine the optimal preventive maintenance period and the optimal preventive maintenance number by minimizing the expected cost rate per unit time. Finally, the optimal periodic preventive maintenance policy is given for Weibull distribution case.

Development of the Preventive Maintenance Template for Static Exciter in the Nuclear Power Plant (원자력발전소 정지형 여자기의 예방정비기준(PMT) 개발)

  • Chin, Soo-Hwan;Park, Jin-Youb;Hong, Young-Hee
    • Journal of Energy Engineering
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    • v.20 no.2
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    • pp.154-162
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    • 2011
  • PMT(Preventive Maintenance Template) is a standardized maintenance program that describes maintenance items & period as operation condition to increase component reliability at the component level. The existing maintenance programs are focused on time based maintenance to inspect and repair component depend on fixed period. But recently, we have developed advanced maintenance program(named PMT) to increase reliability and optimize maintenance program of the plant significant component. This paper presents how to develop the PMT for nuclear power plant's static exciter.

A Study of Plans for the improvement of the domestic building maintenance system based on the comparison and analysis of foreign building maintenance systems (외국의 유지관리 제도 비교분석을 통한 국내 건축물 유지관리 개선 방안 연구)

  • Yoon, Hyo-Jin;Chung, Kwang-Ho
    • Journal of The Korean Digital Architecture Interior Association
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    • v.9 no.2
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    • pp.25-33
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    • 2009
  • So far we have investigate and analyzed the actual conditions of building maintenance in Korea and compared the building maintenance laws and systems between Korea and other countries. Now, based on the results from such comparison and analysis, this study proposes the following ideas for improvement: 1) As we can learn from domestic and foreign case studies, in the existing built-up areas becoming obsolete, many building owners remodel their buildings illegally in reaction to current economic and social changes. Therefore, for efficient maintenance of buildings, it is required to improve building maintenance systems by formulating information about inspection items, inspectors, supervisors, inspection costs and intervals of reporting results, depending on how large the buildings are and what they are used for. 2) In addition, to ensure the success of a building maintenance system, it is necessary to keep and manage a history of building maintenance thoroughly and introduce a certification program which gives an appropriate grade to maintenance performance and commits the government to expand their public roles and supporting policies, as widely used in some foreign countries. Further, in keep the building maintenance system secure, there should be a nationwide consensus as well as a favorable evaluation from building owners and manager, and all related people.

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A Study on the Maintenance System Module Design for the BTL Project Facilities : Focused on Educational Facilities (임대형 민자사업(BTL) 발주 시설물의 합리적 유지관리시스템 모듈 설계에 관한 연구 -교육시설물을 중심으로-)

  • Kim, Sang-Seok;Son, Jae-Ho;Lee, Seung-Hyun;Kim, Jae-On
    • Proceedings of the Korean Institute Of Construction Engineering and Management
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    • pp.702-707
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    • 2008
  • BTL projects for educational facilities were conceived in 2005 to supply public facilities in a timely and efficient manner After the projects were completed in March 2007, proper facility maintenance has become an increasingly important issue. However, BTL projects are still in an early developmental stage, and the data on the maintenance and operation of such facilities are not yet available because the operation of the facilities has just begun. Accordingly, this study is conducted to derive maintenance processes and to specify maintenance items for the efficient maintenance of BTL educational facilities. Then, database on the maintenance processes will be created, and a maintenance system module will be designed.

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Tele-robotic Application for Nozzle Dam Maintenance Operation in Nuclear Power Plants

  • Seo, Yong-Chil;Kim, Chang-Hoi;Cho, Jae-Wan;Kim, Seung-Ho
    • 제어로봇시스템학회:학술대회논문집
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    • pp.1520-1524
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    • 2004
  • This paper describes the development of a robotic maintenance system for use in a maintenance operation of the nozzle dam in a water chamber of a steam generator at the Kori nuclear power plant in Korea. The robotic maintenance system was designed to minimize the personnel exposure to a hazardous radioactive environment. This robotic maintenance system is operated by a teleoperated control which was designed to perform the nozzle dam maintenance tasks in a remote manner without endangering the human workers. Specific maintenance tasks involve the transportation, insertion, and removal of nozzle dams in a water chamber inside a steam generator via a narrow man-way entrance port. The developed robotic maintenance system has two major subsystems: a two degrees of freedom guiding device acting as the main guiding arm and a master-slave manipulator with a kinematic dissimilarity. The mechanical design considerations, control system, and capabilities of the robotic maintenance system are presented. Finally, a graphical representation of the nozzle dam maintenance processes in a simulated work environment are also demonstrated.

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Economic Assesment for Track Ballast Structures based on Proper Maintenance Level (적정 유지관리수준에 기초한 궤도도상구조에 대한 경제성 검토)

  • Baek, Jae-Wook;Joo, Hwan-Joong;Song, Yoo-Seob;Park, Tae-Hyo
    • Journal of the Korean Society for Railway
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    • v.10 no.2
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    • pp.167-178
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    • 2007
  • In general, it is known that the concrete ballast track is possible to reduce a cost of maintenance activities cause of maintenance free by restrictive maintenance in application of track ballast structures. However, if deteriorations and fracture mechanism of a material are considered, proper maintenance activities and repairing are continually required. For the problems, we evaluated an economical efficiency of the gravel ballast and the concrete ballast on a proper level of maintenance activities. As the method based on history path is difficult to obtain sufficient reliabilities cause of an absence of real data for maintenance activities, we chose the delphi survey method by professional group, and we obtained the appropriate index and profiles for maintenance activities. As a result, we founded that effects for cost reduction can be expected by preventive maintenance management, and we proposed economical restrictions and life cycle cost for track ballast structures in a life cycle.

Optimal Maintenance Cycle for Aviation Oil Testing Equipment under the Consideration of Operational Environment (운용환경을 고려한 항공오일시험장비의 최적정비주기 설정)

  • Kim, In Seok;Jung, Won
    • Journal of Applied Reliability
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    • v.16 no.3
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    • pp.224-230
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    • 2016
  • Purpose: Military maintenance involves corrective and preventive actions carried out to keep a system in or restore it to a predetermined condition. This research develops an optimal maintenance cycle for aviation oil testing equipment with acceptable reliability level and minimum maintenance cost. Methods: The optimal maintenance policy in this research aims to satisfy the desired reliability level at the lowest cost. We assume that the failure process of equipment follows the power law non-homogeneous Poisson process model and the maintenance system is a minimal repair policy. Estimation and other statistical procedures (trend test and goodness of fit test) are given for this model. Results: With time varying failure rate, we developed reliability-based maintenance cost optimization model. This model will reduce the ownership cost through adopting a proactive reliability focused maintenance system. Conclusion: Based on the analysis, it is recommended to increase the current maintenance cycle by three times which is 0.5 year to 1.5 years. Because of the system's built-in self-checking features, it is not expected to have any problems of preventative maintenance cycle.

Optimum maintenance scenario generation for existing steel-girder bridges based on lifetime performance and cost

  • Park, Kyung Hoon;Lee, Sang Yoon;Yoon, Jung Hyun;Cho, Hyo Nam;Kong, Jung Sik
    • Smart Structures and Systems
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    • v.4 no.5
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    • pp.641-653
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    • 2008
  • This paper proposes a practical and realistic method to establish an optimal lifetime maintenance strategy for deteriorating bridges by considering the life-cycle performance as well as the life-cycle cost. The proposed method offers a set of optimal tradeoff maintenance scenarios among other conflicting objectives, such as minimizing cost and maximizing performance. A genetic algorithm is used to generate a set of maintenance scenarios that is a multi-objective combinatorial optimization problem related to the lifetime performance and the life-cycle cost as separate objective functions. A computer program, which generates optimal maintenance scenarios, was developed based on the proposed method using the life-cycle costs and the performance of bridges. The subordinate relation between bridge members has been considered to decide optimal maintenance sequence and a corresponding algorithm has been implemented into the program. The developed program has been used to present a procedure for finding an optimal maintenance scenario for steel-girder bridges on the Korean National Road. Through this bridge maintenance scenario analysis, it is expected that the developed method and program can be effectively used to allow bridge managers an optimal maintenance strategy satisfying various constraints and requirements.