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Journal articles on the topic 'Ship repair and maintenance'
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1
Carr, Bruce A., Thomas M. Houlihan, and Michael A. Polini. "CAD/CAM in Phased Maintenance." Journal of Ship Production 7, no. 04 (November 1, 1991): 234–47. http://dx.doi.org/10.5957/jsp.1991.7.4.234.
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The authors' company is a medium-sized engineering company specializing in naval ship repair. The bulk of corporate work centers on the Phased Maintenance (PM) of three classes of ships. Typically, each PM contract covers three to five different ships per class scheduled for 90-day Availabilities at approximately one-year intervals over a period of five years. The type of work to be performed during each Phased Maintenance Availability (PMA) falls into one of two categories: ship alterations or ship repairs. The first group, ship alterations, is characterized by detailed, long-lead engineering and planning efforts, typically beginning 540 days prior to the vessels's arrival. The second group, ship repairs, makes up the other end of the spectrum with short lead times and compressed service details. The majority of repair items are identified 60 days prior to an Availability, while some are not determined until after the vessel has arrived in the shipyard. The engineering department that services PMA work is composed of three disciplines: structural, mechanical and electrical. The mechanical discipline is further subdivided into the areas of machinery and piping/HVAC. While the nature of PMA work within each discipline is peculiar to the application, the process is similar in each. Reference information is gathered and verified, technical analysis is provided where necessary, and detailed drawings are prepared and submitted for Navy approval prior to shipyard production. All drawings are developed using two-dimensional drafting techniques at various sites by teams of computer-aided design (CAD) input operators utilizing color graphic workstations on a multi-shift basis as required by the workload. Completed drawings are transferred to the engineering site over a network link, where additional workstations are available for engineers to check and correct them as necessary
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Blanton, Gerald B. "The Future of Navy Ship Maintenance — One Point-of-View." Journal of Ship Production 13, no. 02 (May 1, 1997): 147–52. http://dx.doi.org/10.5957/jsp.1997.13.2.147.
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In the next five years, Navy ship maintenance requirements will challenge both public and private ship repair organizations to provide quality upkeeps within costs and schedule constraints. This paper examines key forcing functions impacting ship maintenance decisions, discusses ongoing Navy maintenance initiatives, and speculates on maintenance philosophical changes. Finally, the paper addresses some implications of these forcing functions, initiatives, and philosophy changes on the ship repair industry.
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Song, Tingxin, Taiyang Tan, and Guochen Han. "Research on Preventive Maintenance Strategies and Systems for in-Service Ship Equipment." Polish Maritime Research 29, no. 1 (March 1, 2022): 85–96. http://dx.doi.org/10.2478/pomr-2022-0009.
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Abstract With continuous improvements in the function and performance of ship equipment, mechanisms of failure have become more and more complicated. To avoid over-maintenance or under-maintenance in existing routine ship maintenance strategies, a ship-level method for repair decisions based on the preventive maintenance concept is proposed in this paper. First, the anticipated repair demand levels of key components are calculated using an improved failure mode and effects analysis (FMEA) method; second, a Weibull distribution model is established, and the parameters are estimated using the maximum likelihood estimation (MLE) to predict the characteristic life of the equipment; then, logical decision principles and rule-based reasoning (RBR) are used to determine the ship repair level and repair timing. Finally, the feasibility and application value of the proposed repair strategy were verified by case studies, and a ship-level system for repair decisions was established.
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Song, Tingxin, Taiyang Tan, and Guochen Han. "Research on Preventive Maintenance Strategies and Systems for in-Service Ship Equipment." Polish Maritime Research 29, no. 1 (March 1, 2022): 85–96. http://dx.doi.org/10.2478/pomr-2022-0009.
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Abstract With continuous improvements in the function and performance of ship equipment, mechanisms of failure have become more and more complicated. To avoid over-maintenance or under-maintenance in existing routine ship maintenance strategies, a ship-level method for repair decisions based on the preventive maintenance concept is proposed in this paper. First, the anticipated repair demand levels of key components are calculated using an improved failure mode and effects analysis (FMEA) method; second, a Weibull distribution model is established, and the parameters are estimated using the maximum likelihood estimation (MLE) to predict the characteristic life of the equipment; then, logical decision principles and rule-based reasoning (RBR) are used to determine the ship repair level and repair timing. Finally, the feasibility and application value of the proposed repair strategy were verified by case studies, and a ship-level system for repair decisions was established.
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Ahluwalia, Rashpal, and Denis Pinha. "Decision Support System for Production Planning in the Ship Repair Industry." Industrial and Systems Engineering Review 2, no. 1 (July 8, 2014): 52–61. http://dx.doi.org/10.37266/iser.2014v2i1.pp52-61.
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All ships and offshore platforms, however large or small, undergo scheduled or unscheduled repair and maintenance. The bidding process for ship repair jobs is highly competitive and global in scope. The ship repair industry is also prone to significant risks due to high level of capital investment in skilled labor, specialized equipment, and facilities such as dry docks. Several decision support tools have been utilized by the ship repair and maintenance industry with limited success. The focus of these tools is on mid or long-term planning. They view the system as various cost centers and attempt to minimize cost at each center. This paper proposes a decision support system for short term planning. It is oriented towards day to day decision making by ship yard personnel. Its focus is on enhancing system throughput and minimizing total cost. It utilizes a common corporate database to store and retrieve information and to generate timely reports for the management. By focusing on system throughput and overall cost, unnecessary internal completion between cost centers can be avoided, resulting in fewer delays and resource overloading.
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Wittenborn, John L., and William M. Guerry. "Liability for Hazardous Wastes Produced During the Course of Ship Repair." Journal of Ship Production 6, no. 03 (August 1, 1990): 175–79. http://dx.doi.org/10.5957/jsp.1990.6.3.175.
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Many common ship repair tasks result in the production of quantities of various hazardous wastes. These wastes, regardless of volume, present difficult burdens for shipyards and the U.S. Navy. Under federal environmental laws, the responsibility for handling hazardous wastes and the liability for their ultimate disposal rests with the person or persons who create the wastes and who arrange for their disposal. Oftentimes, however, the responsibility and liability for handling and disposing of these wastes is unclear. This is especially true when naval ships are repaired in contractor facilities and wastes are produced by the activities of ships' force, contractor personnel, or some combination of the two. Further complicating the web of liability is the divergent source of the wastes. Some wastes are produced as a direct result of required maintenance work on ship systems. Other wastes may be produced in the yard by activities which are largely discretionary with the contractor. Ultimately, these wastes from all sources must be identified, packaged, stored, treated, transported, and disposed. Potential future liability may arise at each step in this process. This paper reviews briefly the structure and function of two principal federal hazardous waste statutes and explains how their myriad complex responsibilities and liabilities are applied in the context of a typical ship repair2
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Zagan, Remus, Iwona Paprocka, Mihaela-Greti Manea, and Emill Manea. "Estimation of Ship Repair Time Using the Genetic Algorithm." Polish Maritime Research 28, no. 3 (September 1, 2021): 88–99. http://dx.doi.org/10.2478/pomr-2021-0036.
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Abstract Ship maintenance is regulated by both the state and the classification society. The scope of maintenance works depends on the age of the ship and includes a dock, intermediate and special inspection. The problem is to estimate the reliable time of the ship maintenance and the downtime at the shipyard. The purpose of this article is to develop a more accurate model to predict a ship’s overall maintenance time. A multiple linear regression model is developed to describe the impact of historical data on hull repair, painting time, piping, age, structural and hull plate replacement for ship maintenance. In the literature, the least squares method is used to estimate unknown regression coefficients. The original value of the article is the use of a genetic algorithm to estimate coefficient values of the multiple linear regression model. Necessary analysis and simulations are performed on the data collected for oil and chemical or product tankers. As a result, a significant improvement in the adequacy of the presented model was identified.
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Hadi, Syamsul, Alfarizi Al Azis, Vinan Viyus, Etik Puspitasari, Ahmad Hanif Firdaus, and Andri Setiawan. "Planning for Maintenance and Repair of Continuous Ship Unloader Using the IRRO Method." Logic : Jurnal Rancang Bangun dan Teknologi 21, no. 1 (March 30, 2021): 52–63. http://dx.doi.org/10.31940/logic.v21i1.2383.
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The problem faced is damage, especially to the screw conveyor from the Continuous Ship Unloader (CSU) as a dry bulk material transfer equipment (phosphate rock) which is taken from the ship's hold which is flowed by a screw conveyor followed by the belt conveyor to the material warehouse to be processed into a type of fertilizer. The purpose of planning is to obtain a schedule and estimated cost of maintenance and repair of CSU for the period 2022 to 2025, and to obtain the ratio of maintenance-repair costs to the profit of the machine. Planning methods uses the IRRO (Inspection, Replace, Repair, and Overhoul) method include data collection of machine maintenance history and component breakdowns, checking CSU specifications, making a list of component life predictions and component prices, predicting costs and duration of component dissasembly, screw conveyor repair, maintenance and repair scheduling, and maintenance and repair cost estimates. The real results of planning in the form of a maintenance and repair schedule for the period of 2022 to 2025; maintenance and repair costs respectively for the years 2022 to 2025 are IDR 136,873,000; IDR 335,986,000; IDR 160,687,000; and IDR 464,733,000; and the ratio between maintenance costs to profit for the years 2022 to 2025 is 0.51, 1.22, 0.57, and 1.63 which means the machine is still fit for use without the need for refurbishment because it is still prospective.
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JUNG, Inhwan, He SUN, Jangmook KANG, Choong Hyong Lee, and Sangwon LEE. "Big Data Analysis Model for MRO Business Using Artificial Intelligence System Concept." International Journal of Engineering & Technology 7, no. 3.33 (August 29, 2018): 134. http://dx.doi.org/10.14419/ijet.v7i3.33.18593.
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The rapidly changing environment of the shipbuilding industry has put Korea’s shipbuilding industry in a crisis. The purpose of this study was to develop a business model to maintain, maintain and operate Big Data-based MRO(Maintenance, Repair, and Operation) consumables, which is expected to be the new growth engine for the domestic shipbuilding industry. Although Korean shipbuilders have world-class technologies for ship dogma, the market for ship maintenance and repair is still in its infancy. For Korean shipbuilders, MRO business can be a growth engine that will provide food for the next 30 years, but to do so, we need to make sure that everything that happens in the entire process, from ship design to maintenance and maintenance. Therefore, by systematically establishing Big Data related to components and developing MRO business models based on data analysis capabilities using Artificial Intelligence system concept, we can develop new growth engines for related industries in Ship Industry.
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Siswantoro, Nurhadi, Hari Prastowo, Hafiz Rahadyan Nugroho, Muhammad Badrus Zaman, Trika Pitana, Dwi Priyanta, and Hari Prastowo. "A Preliminary Web-Based Intermediary Application Design For Ship Repair Planning Services." IOP Conference Series: Earth and Environmental Science 1081, no. 1 (September 1, 2022): 012047. http://dx.doi.org/10.1088/1755-1315/1081/1/012047.
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Abstract According to data from the 2019 Ministry of Transportation Statistics Book, the number of national shipping fleets or ships in the country from 2015-2019 has doubled. However, from the potential of the current operating fleet, it shows that more than 75% of the fleet are over 20 years old. With such conditions, it is necessary to plan for ship maintenance and repairs to be as good as possible and to spend as little time as possible. This research aims to design a web-based intermediary application for ship repair planning services that can be accessed by using a website browser. The initial stage is to observe the condition of ship repair and planning from shipyard and shipowner perspectives through the literature and field study. From the result of the observation, then analyze what problems occur in the field and then arrange what functions or features are needed to be included in the design of the application to be able to solve these problems. Application design is done by making mock-ups, designing interfaces, creating databases and coding of the application system. After that, the application is tested and verified to find out that the application can run as intended and know the strengths and weaknesses of the application. The features in this application are designed to intermediary shipyard and shipowner in the ship repair planning process. The result of this preliminary web-based application design is by using this application, ship owners can search for docking space in available shipyards according to the schedule and place desired by the shipowner. In addition, by using this application, the shipowner can find out when the ship’s certificate expires so that they can prepare a schedule for conducting a survey. Then, both the shipyard and the shipowner can use this application to monitor and report on the progress of ship repair work.
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Zhang, Yongxuan. "Analytical model for the ship purchase and maintenance decision in the new economy." BCP Business & Management 33 (November 20, 2022): 650–66. http://dx.doi.org/10.54691/bcpbm.v33i.2851.
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The maritime industry is currently increasing, and the industry will continue to grow due to the rapid growth of the global economy. The industry and the business of maritime companies bring with them the issue of vessel renewal and repair. To explore the impact of vessel renewal or repair on the company's benefits, we conducted a simulation experiment focusing on how the company should ensure maximum benefits if the vessel needs to be repaired. On the one hand, repair the vessel to continue operations. On the other hand, new vessels are purchased to replace the old ones. According to the data, Shipping companies make higher profits by replacing their vessels with new ones.
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Kartiko, Donni, Suparno Suparno, Okol S Suharyo, Ahmadi Ahmadi, and Arica Dwi Susanto. "DETERMINATION OF MAINTENANCE PRIORITY INDONESIAN NAVY SHIP DEPO LEVEL USING FUZZY MCDM." JOURNAL ASRO 9, no. 2 (September 10, 2018): 75. http://dx.doi.org/10.37875/asro.v9i2.79.
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The Indonesian Navy as a defense and security force of the sea has combat tools and supporting facilities projected in the Integrated Fleet Weapon System (Sistem Senjata Armada Terpadu/SSAT) with several components including Indonesian navy ships, marines, aircraft and bases. Depo level maintenance is comprehensive maintenance that can only be carried out by personnel who are experts in their field and supported by complete and sophisticated equipment and facilities. Maintenance at this level includes complete overhaul repairment, repowering MLM (mid life modernization), calibration of all equipment, and repairs to all parts thoroughly. Depo Level Maintenance is the nature of maintaining technical conditions based on rotary hours. If the repair schedule specified in the SPT (System for Planned Maintenance), the schedule must be carried out. This research aimed to present a priority setting solution in Depo level maintenance wherein the highest Indonesian Navy Ship ranking is determined from the level of the decision makers. Fuzzy MCDM is a method developed for decision making on several alternative decisions to get an accurate and optimal decision. In Indonesian Navy Ship Hardepo priority ranking process taken from the level of data processing decision makers using the Fuzzy MCDM method, the 5 highest priority values in implementation were obtained. Hardepo with the highest scores were KRP-812 0.111, BDU-841 0.108, LAM-374 0.107, KRS-624 0.097 and TJA-541 0.073
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Fruytier, Pierre-Andre M., and Arun Kr Dev. "Predicting Ship Maintenance and Repair Labor with Artificial Neural Networks." Journal of Ship Production and Design 38, no. 01 (October 22, 2021): 9–18. http://dx.doi.org/10.5957/jspd.10200027.
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Ship maintenance and repair work cost estimation is often regarded as an “Art,” which may contribute to the financial success or distress of a shipyard. Regarded as experts by senior management, estimators are among the most valued resources, and nonetheless, human. Over time, estimators learn from mistakes, and get better with tenure at sharpening assessments. When estimators retire without having groomed an apprentice, shipyards may be at risk of losing a lot of know-how, all at once. These shipyards may well find very costly to experience, for a while, estimating skills stepping back on the learning curve. Yet, even shipyards relying on less advanced information technology may have unwittingly accumulated a lot of valuable data relevant to ship maintenance and repair works. These shipyards may overlook how easily accessible knowledge can be turned into a competitive advantage through predictive analytics. Not only can this data be literally mined, but machine learning algorithms, such as Artificial Neural Networks (ANN), can now process it for a speedy and preliminary estimate through faster and cheaper computing power. To be clear, the purpose is not to replace the human estimator but to help the expert quickly assess, when times are busy, whether to bid or not on a specific project opportunity. In the absence of The Master Estimator, an Apprentice may also look for a quick and cheap sanity check of the prepared estimate before submitting a bid. The study carried out in this article is based on all ship maintenance and repair data recorded at a single North American shipyard over the last 19 years since the current information systems were implemented. This raw data extract with all directly paid hours logged daily by workers on 1277 ship maintenance and repair projects was screened through advanced data cleansing. To enrich the cleansed data tables, additional independent variables were subsequently collected internally and externally to develop a training–testing data set. The final 657 projects represent 136 vessels regrouped in eight types, for which 28 other independent variables were all made available for training up to testing simple ANN models. The scope of this article is limited to the estimation of the direct labor required to complete ship maintenance and repair projects on a specific type of vessels for which workforce planning and tactical pricing was deemed the most relevant to keep the business afloat.
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Emil, Manea. "Using regression theory to solve some problems regarding ship repairing and maintenance activities in shipyards." Scientific Bulletin of Naval Academy XXIII, no. 2 (December 15, 2020): 153–60. http://dx.doi.org/10.21279/1454-864x-20-i2-020.
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The owners will always try to reduce the ships maintenance works timeframe clearly aimed at reducing the period during which the ship has no income. In turn, the shipyard also will try to reduce the timeframe for the maintenace works carried out on board of the drydocked ships and alongside berths, clearly aimed at revenue maximizing by contracting a larger number of ships for drydocking. The objective was to find a method (using regression theory) for the ships drydocking and/or berthed maintenance works carried out in the shiprepairs shipyards time frame that exploits the information held by the shipyard in their maintenance and repairs works portfolio performed for various customers over time.
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Moseyko, Evgeniy Sergeevich, and Evgeniy Olegovich Olkhovik. "Studying reliability of marine pump systems by using technical supervision data." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 2021, no. 4 (November 30, 2021): 7–16. http://dx.doi.org/10.24143/2073-1574-2021-4-7-16.
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The article describes the analysis of the ship systems’ reliability at the stage of the technical design, which is based on the reliability data of individual system elements and mathematical methods of reliability theory. During the ship operation maintenance deficiencies can lead to the equipment failure, which can be prevented by the methods of instrumental diagnostics of system elements, maintenance repairs regardless of the current technical condition, and classification inspection during the ship operation. Collecting the detailed data on changes in the functional reliability of ship mechanical systems, which could confirm or deny the advantages of each of the existing methods is not enough. There has been carried out collecting, processing and analyzing the actual data on the life cycles of various pumps of ship systems at different stages of service life, as well as beyond the designated service life or operating time. There are examined the general ship systems and auxiliary power units of icebreakers and floating structures. The examined equipment has standard pumps with different capacity and efficiency. Service life, assigned resource (operating time), frequency of repair are taken as the criteria of pump reliability and durability. There have been shown the actual life cycles of pumps in dependence of the service life in years on the operating time in hours; in addition, data on the passage of maintenance repairs, maintenance, inspection of the technical condition, as well as replacement or extension of the service life are plotted on the graphs. It has been inferred that some of the pumps in the ship's systems should be replaced before the full resource was developed, while the performance of the systems as a whole was preserved or restored as a result of repairs; some pumps have exceeded their specified resource, but during the technical inspection their operation was extended, the operability of the systems was also preserved.
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Manea, M. G., R. Zăgan, and E. Manea. "The importance of the technical specification of works for the ships repair processes in the maritime shipyards." IOP Conference Series: Materials Science and Engineering 1182, no. 1 (October 1, 2021): 012042. http://dx.doi.org/10.1088/1757-899x/1182/1/012042.
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Abstract The technical specification purpose is to include the ship maintenance and improvement works needed to be carried out onboard in a repair shipyard, so that after these works performing to allow for the classification society certification, thus confirming the ship satisfactory technical condition and the relevant requirements of the classification rules were applied, thus confirming the applied management maintenance also. The technical specification has a very important role for the evaluations, done by the shipyard in preparing price and time quotation and the owner / manager, done for the comparison analyzing based on the evidence that the maintenance and improvement workflows performing on board the ship in a shipyard for works depend on the technical specification quality of preparation, which means that had to provide the necessary information in relation to the volume and type of works needed to be carried to the ship hull and structures, machinery, equipment, plants and systems supported by the necessary technical information plans approved by the classification society and the works sheets documentation referring to the followings: work location / equipment thereof number of pieces; types of the works required to be performed on location / equipment; works estimated required to be undertaken on location / equipment. The advantage of a quality technical specification is the limitation of the possibility of ordering additional works during the execution of works for maintenance, upkeeping and improvements on board the shipyard, the costs of the shipyard and the ship being thus maintained at the estimated budgets. The paper purpose is to highlight the advantages of a good quality technical specifications which consists of limiting the possible means of developing additional orders during the execution of maintenance and improvement works on board, thus the shipyard and ship costs being possible to be kept within the original estimated budget margins.
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Oktafiana, Laily Okta, and Intan Baroroh. "Comparative Analysis of CPM, PDM and PERT Methods in Ship Repair Scheduling Planning KN. RB 309 Ternate 01." BERKALA SAINSTEK 10, no. 3 (October 4, 2022): 162. http://dx.doi.org/10.19184/bst.v10i3.32479.
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A ship that is still carrying out sailing activities must always be in a state that is in accordance with the classification and statutory. Maintenance or repair is needed for the ship in order to stay in good condition and fit to sail. In a ship repair project, there are several important aspects that need to be considered in order to complete project activities quickly and precisely. PT. XYZ has carried out ship repair activities, but the repair activities have been delayed due to weather factors, and the late procurement of spare parts. This research was conducted by analyzing the three models of scheduling fiberglass ship repair projects using Microsoft excel and using the CPM (Critical Path Method), PDM (Precedence Diagram Method) and PERT (Project Evaluation and Review Technique) methods. Results from the CPM method on 48-day A scheduling, 33-day B scheduling, and 21-day C scheduling. Pdm method results scheduling A 48 days, scheduling B 33 days, and scheduling C 21 days. In the PERT method the project can be completed in 48 days which is 48.67%, scheduling B 34 days 5 hours 21 minutes with the possibility of a KN ship repair project. RB 309 Ternate 01 can be completed in 48 days i.e. 99.35% and scheduling C 22 days 5 hours 21 minutes with the possibility of a KN ship repair project. RB 309 Ternate 01 can be completed in 48 days which is 99.99%.
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Charchalis, Adam. "Measurement and Diagnostic System for Marine Engines." Journal of KONBiN 49, no. 3 (October 1, 2019): 33–48. http://dx.doi.org/10.2478/jok-2019-0049.
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Abstract The Scheduled Maintenance System allows ship-owners and operators to plan, carry out and document the maintenance and repair of equipment and mechanisms on board the ship at intervals in accordance with the class requirements imposed by the Classification Societies and the manufacturer of the equipment. In order to develop the research capabilities of the Faculty of Marine Engineering of Gdynia Maritime University, a Measurement and Diagnostic System has been developed to assess the technical condition of machinery and equipment in operation on board the ship. Modernization of measuring equipment, significantly expanded the research capabilities, which resulted in increasing the scope, improving quality, and speeding up the research and development work in the field of safety of operation and diagnostics of engine rooms and ship operation.
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Apriliani, Izza M., Sugeng H. Wisudo, Budhi H. Iskandar, and Yopi Novita. "JARINGAN KERJA DAN EFEKTIVITAS PERBAIKAN KAPAL DI GALANGAN KPNDP DKI JAKARTA, MUARA ANGKE (Network and Effectiveness of Ship Repair at KPNDP Shipyard DKI Jakarta, Muara Angke)." Marine Fisheries : Journal of Marine Fisheries Technology and Management 5, no. 1 (September 28, 2016): 79. http://dx.doi.org/10.29244/jmf.5.1.79-89.
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<p>ABSTRACT<br />A shipyard is a supporting element to meet the eligibility requirements through maintenance service for vessels and their engines. Lead time for ship repair may vary, depending on the condition of ship. The length of the ship repair process can lead to shipyard queuing. One attempt to improve the mechanism and ship repairing time is by analyzing the network. This study aims to identify the network diagram, to determine the critical path, and to find out the effectiveness of ship repair process. Activities and duration during ship repairing process were analyzed using critical path method (CPM) and measured the value of its effectiveness. The objects that were observed in this study are minor repairs and major repairs. The results showed that a minor repairs can be implemented in 7 days while based on productivity index it can be completed in 5 days and has a 98% effectiveness than the time alocated by the shipyard. Major repairs can be completed during 10 days; these repairing lead time were affected by damage to the machine which requires a long recovery process.</p><p><br />Key words: CPM, effectiveness of ship repair, network analysis</p><p>-------</p><p><br />ABSTRAK</p><p>Galangan kapal merupakan unsur penunjang untuk memenuhi kebutuhan kelaikan kapal melalui perawatan beserta mesinnya. Proses perbaikan kapal dapat bervariasi tergantung dengan kondisi kapal. Lamanya proses perbaikan kapal dapat mengakibatkan terjadinya antrian galangan. Upaya untuk meminimalisir antrian kapal salah satunya dengan menganalisis jaringan kerjanya. Penelitian ini bertujuan untuk mengidentifikasi struktur jaringan kerja, menentukan jalur kritis serta mengetahui efektifitas proses perbaikan kapal. Proses dan waktu perbaikan kapal dianalisis menggunakan metode jalur kritis (Critical Path Method) kemudian dihitung nilai efektivitasnya. Hal yang diamati dalam penelitian ini yaitu perbaikan ringan dan perbaikan berat. Hasil penelitian menunjukkan bahwa penyelesaian perbaikan ringan di galangan KPNDP membutuhkan waktu selama 7 hari sedangkan berdasarkan index produktivitasnya dapat diselesaikan selama 5 hari dan memiliki efektivitas 98% dibandingkan waktu yang dialokasikan oleh galangan. Perbaikan berat dapat diselesaikan selama 10 hari, lamanya perbaikan ini dipengaruhi dengan kerusakan mesin yang membutuhkan proses perbaikan yang lama.</p><p><br />Kata kunci: CPM, efektivitas perbaikan kapal, analisis jaringan kerja</p>
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Doherty, Owen J. "Ready Reserve Fleet: Ship Maintenance and Activations." Journal of Ship Production 13, no. 03 (August 1, 1997): 188–97. http://dx.doi.org/10.5957/jsp.1997.13.3.188.
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As the size of the United States flag fleet continues to shrink, the Ready Reserve Force (RRF) assumes an even greater importance in national emergencies. There are approximately 100 RRF vessels located throughout the littorals of the United States. The outported vessels are shown in Fig. 1. Other vessels are either located at one of the three Reserve Fleets or have been activated for the Department of Defense. The maintenance of these vessels is critical to their successful activation and operation. The Maritime Administration (MARAD), which is part of the Department of Transportation, has taken action on key areas of concern in the lessons learned from Desert Shield/Desert Storm. This has resulted in improving the reliability and timeliness of the vessels in meeting their activation requirements. One major improvement (started in fiscal year 1996) is the placement of nine-and ten-man crews onboard the majority of the vessels to ensure readiness. In addition, sea trials and dock trials will be conducted more frequently. Some system upgrades are being accomplished for safe, reliable operations. Also, MARAD is reviewing contracting procedures to improve and to simplify the award of ship repair contracts. This paper gives an overview of how MARAD maintains RRF vessels. In particular, it discusses the type and amount of outside support (industrial assistance) needed to both maintain and activate the vessels. There is a wide variety of vessels in the RRF, ranging from break-bulk ships to offshore petroleum discharge vessels. Furthermore, the RRF fleet is strategically located across the United States, requiring a widespread need for industrial assistance in terms of both type and location of services required.
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Bin Abdul Wahid, Al-Shafiq, Mohd Zamani Bin Ahmad, Sunarsih ., Mohd Najib Bin Abdul Ghani Yolhamid, Mohamad Abu Ubaidah Amir Abu Zarim, Aisha Binti Abdullah, and Nur Hanani Bt Ahmad Azlan. "Measuring Severity of Downtime Influence Factors to Naval Ship Operational Availability: A Delphi Study." International Journal of Engineering & Technology 7, no. 2.29 (May 22, 2018): 940. http://dx.doi.org/10.14419/ijet.v7i2.29.14288.
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Rapid development of shipbuilding and ship repair industry in recent years has been increasingly transforming the way organizations apply the long term strategic thinking of “cradle to grave” maintenance approach in order to maximize their growth in a dynamic marine industry. With increased ship complexity, size and revolutionary design, organizations strive to balance ideal maintenance philosophies against on-going efforts of cost reduction whilst maintaining high availability of vessels. Despite aspiration and efforts to improve the ship availability, the Royal Malaysian Navy [RMN] vessels which are currently maintained under the In Service Support [ISS] Contracts are hardly tackling the human and equipment related aspects due to limited knowledge and available data on ship Downtime Influence Factors [DIFs]. The current research carried out an explorative study across various engineering disciplines to generate RMN ship maintenance DIFs and their severity measures via a 3-Stage Modified Delphi approach. 30 Experts experienced in daily implementation of naval ship maintenance contracts were involved. In the first stage, Focus Group Discussions [FGDs] amongst Experts were conducted to produce the DIFs, followed by questionnaire distribution to measure the severity of the DIFs in the second stage. In the third stage, the Severe DIFs were confirmed and ranked based on a Risk Assessment method. The study revealed 50 DIFs to RMN ship availability and deduced the top 15 Severe DIFs pinpointing the key problem areas to prioritize efforts in improving RMN ship availability.
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Jakovlev, Sergej, Arūnas Andziulis, Andrius Daranda, Miroslav Voznak, and Tomas Eglynas. "RESEARCH ON SHIP AUTONOMOUS STEERING CONTROL FOR SHORT-SEA SHIPPING PROBLEMS." Transport 32, no. 2 (May 30, 2017): 198–208. http://dx.doi.org/10.3846/16484142.2017.1286521.
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Today most ship rotation angle (steering control during movement) increase or decrease is done using an operator on deck or the auxiliary system in the ships engine room. Formal regulations suggest using manual inspection of the ship rotation and the work effectiveness of the engine during manoeuvring in ports and in the open sea regions. The accuracy of this procedure is very low and depends on the personnel of the deck. Therefore, automation and computer control systems are constantly required to assist the human eye. This problem becomes clearly visible when dealing with full ship autonomy in the open sea in the short-sea shipping regions. The trend of maritime technology development will only increase in the area of human interaction decrease with the physical operations and the shipping procedures, which will lead to the future full ship autonomy in the open sea regions around the globe. With the growing automation technologies, predictive control can prove to be a better approach than the traditionally applied visual inspection policy and linear control models. Ship full autonomy is also linked to the ship’s machinery regular repair and maintenance that has to be carried out for delivering satisfactory performance and minimizing downtime during transportation operations. In this paper, current stages of development of the intelligent transportation system concept are discussed for the ship autonomy in manoeuvring control and a robust ships’ systems integration and communication system concept is presented for several normal and abnormal situations: high-traffic, potentially dangerous situations or port approaching or ship maintenance, with the capability to solve problems with the limited human interface and with a remote control possibility. Then, simplified ship steering motor system for the main pump is analysed for rotation control using control voltage from the converters. Retrieved data from a small experimental control motor is used for the predictive control approach using two different methods: a neural network trained with Basic Levenberg– Marquardt Method and a Linear Model.
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Kimera, David, and Fillemon Nduvu Nangolo. "Predictive maintenance for ballast pumps on ship repair yards via machine learning." Transportation Engineering 2 (December 2020): 100020. http://dx.doi.org/10.1016/j.treng.2020.100020.
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van Rossum, Matthias. "Building maritime empire: Shipbuilding and networks of coercion under the Verenigde Oost-Indische Compagnie (VOC) in South and Southeast Asia." International Journal of Maritime History 31, no. 3 (August 2019): 465–80. http://dx.doi.org/10.1177/0843871419860699.
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This article maps the overseas infrastructure of the Dutch East India Company (VOC) for ship maintenance and shipbuilding. Reversing the perspective on the VOC, emphasizing the centrality of the ‘overseas’ or Asian activities, it studies how the VOC set up an infrastructure for shipbuilding, ship maintenance, and the necessary supporting industries in Asia. Historians have primarily examined the Company as a ‘merchant’, but the organization of the workplaces and underlying infrastructure for building and repairing ships reveals how important it activities and role as ‘potentate’ and ‘producer’ were. Mobilizing the resources and labour needed for the maintenance of its maritime infrastructure, especially in shipbuilding and repairs, the Company alternated monopolistic and outsourcing strategies, and regularly resorted to coercion.
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Kwon, Kihyon, and Dan M. Frangopol. "Fatigue Life Assessment and Lifetime Management of Aluminum Ships Using Life-Cycle Optimization." Journal of Ship Research 56, no. 02 (June 1, 2012): 91–105. http://dx.doi.org/10.5957/jsr.2012.56.2.91.
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The development of aluminum ship structures has been promoted in the context of the rapid evolution of high-speed and light-weight vessels. Under the repeated and/or fluctuating application of stresses during voyages, fatigue damage of structural ship members is accumulated. For this reason, fatigue reliability analysis has to be conducted for assessing and predicting lifetime performance of aluminum ships. This assessment offers the opportunity to optimally perform the lifetime ship structural management planning. To allocate limited financial resources required to balance the lifetime reliability of ship structural details and the life-cycle cost, single-or multi-objective optimization can be used. The multi-objective optimization problem has several competing objectives such as:(minimizing the life-cycle maintenance cost,maximizing the fatigue reliability of details with welded attachments, andminimizing the fatigue damage. The S-N (stress vs. number of cycles) approach and available sea loading information are used to evaluate the time-dependent fatigue reliability. In this paper, the estimated fatigue reliability is incorporated into a life-cycle cost optimization problem to find the optimal inspection and repair interventions. The proposed approach is illustrated on an aluminum ship detail.
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Kr Dev, Arun, and Makaraksha Saha. "Modeling and Analysis of Ship Repairing Labor." Journal of Ship Production and Design 32, no. 04 (November 1, 2016): 258–71. http://dx.doi.org/10.5957/jspd.2016.32.4.258.
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Labor cost is an important and sensitive issue in labor intensive industry. Ship repairing work is, by nature, labor intensive and not prone to automation. In normal ship repairing or routine maintenance of a ship, labor cost contributes the highest amount in the final invoice. This figure may go up to 70% of the total cost. This cost is directly contributed by labor (man-days) utilized for the ship repairing works. Owners and shipyards are always very keen for lowering the man-days value. Lesser man-days can directly be translated into the lower final invoice (for the owner) and higher productivity (for a shipyard), which can help the shipyard to stay in a competitive market. Ship repairing labor (man-days) and related information for 50 cargo ships of various ages, sizes and types were collected from a single shipyard. A multiple linear regression model was developed and analyzed using these primary data. Ship repairing labor was then expressed as a function of a ship's age, deadweight, type, and repairing works consisting of mainly hull blasting, hull painting, structural steel, and piping. The "method of least squares" was applied to estimate the regression coefficients. In this article, the authors have made an attempt to identify those independent variables that influence ship repairing man-days (the dependent variable) and their interrelationship. A mathematical model has thus been developed and proposed, as a guiding tool, for the decision maker to estimate a more realistic ship repairing labor (man-days) for ships to be under repair.
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Ribeiro da Silva, Filipa. "Dutch, English and African shipbuilding craftsmanship in precolonial West Africa: An entangled history of construction, maintenance and repair." International Journal of Maritime History 31, no. 3 (August 2019): 508–20. http://dx.doi.org/10.1177/0843871419862169.
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In comparative perspective, this article examines the shipping, construction, maintenance and repair of Dutch and English ships, boats and canoes operating in West Africa during the precolonial period. In addition, I discuss the strategies adopted by Dutch, English, and other ‘nations’ of merchants present in the various coastal regions of the African continent, to cope with the challenges posed by port-to-port navigation and transportation in shallow river estuaries along the western coast of Africa. Among these strategies were the transport of pre-fabricated boats of small dimension to the coast on board of heavier ships and recruitment of personnel specialised in ship repair and shipbuilding, to the acquisition, either temporary or permanent, of African boats and recruitment of African boatmen. In this way, merchants’ success on the coast was dependent on both European and African shipbuilding craftsmanship and navigational skills. Our analysis is based on information gathered from travelogues, journals of voyages and collections of correspondence exchanged between European merchants and their commercial agents based in Africa, and between officials of the private European commercial companies on the African coast.
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Dlugokecki, Victoria, Dennis Fanguy, Lisa Hepinstall, and David Tilstrom. "Transforming the Shipbuilding and Ship Repair Project Environment." Journal of Ship Production and Design 26, no. 04 (November 1, 2010): 265–72. http://dx.doi.org/10.5957/jspd.2010.26.4.265.
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In April 2008, NSRP awarded the project entitled "Customization of Web-Based Planning and Production Engineering Technologies to Support Integrated Shipyard Work Flow," a collaborative research project that included Bollinger Shipyards and Atlantic Marine-Mobil. The purpose of the project was to develop and validate a project management approach to shipbuilding and ship maintenance through the delivery of a web-based production and engineering management tool tailored to the needs of this industry along with a reliable, exportable implementation process using planning and production engineering methodologies. This project was designed to enable shipyards to achieve reduction in project costs and cycle time through project standardization and the ability to perform rapid replanning while maintaining align-ment of all project stakeholders in real time. The project enabled the shipyards to bring forth quantifiable improvement opportunities that reflected the biggest impact on project delivery. This paper shares insight into the key findings derived through this transformational body of research, as well as provide an understanding of the robust process used to implement the shipyard-specific web-based project solutions in ship-building and ship repair project environments. The paper also provides a quantification and appreciation of the resulting cost benefits experienced by each of the participating shipyards. New construction programs in each of the shipyards enabled real-time metrics to be captured, illustrating the achievement of cost reduction opportunities resulting from this project.
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Zhang, Shou Jun, and Bin Li. "Hydraulic Steering Gear Failure Analysis and Troubleshooting for MV “TANSUO HAO”." Applied Mechanics and Materials 672-674 (October 2014): 1611–16. http://dx.doi.org/10.4028/www.scientific.net/amm.672-674.1611.
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The rudder and steering gear is the most widely used ship maneuvering equipment. It consists of the maneuvering device, transmission mechanism, steering gear, steering mechanism and the rudder blade. MV "TANSUO HAO" is a scientific research ship of 30 years old. The scientific exploration missions require a very high accuracy of the ship’s course, so the ship has to constantly adjust her course and steer frequently. On that day, the duty officer found the steering gear failure to turn left in the rough sea condition. The engineering crew members had to make an emergency repair. It took plenty of time to locate the trouble of the steering gear in the repair process, because the valve plate deformation problem on the solenoid reversing valve was very hard to find out. By exploring the obscure steering gear failure reason and special troubleshooting process on MV "TANSUO HAO", this thesis provides some repair experience for the hydraulic system management and proposes flexible and patient failure analysis as well as some preventive maintenance measures against the problem.
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Aulia, Surayya, and Hendra Cipta. "Network Planning Analysis Using CPM and PERT Methods on Optimization of Time and Cost." Sinkron 8, no. 1 (January 1, 2023): 171–77. http://dx.doi.org/10.33395/sinkron.v8i1.11961.
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The shipbuilding industry is the most important industry to support sea transportation in the context of maritime development. As a company engaged in shipping, the function of the shipyard is as a place for shipbuilding, ship repair, and ship maintenance. One of the activities carried out by PT. DNC as a shipyard company is to repair TK Aek Sigala-gala. Ship repair is a process of repairing or replacing ship materials that cannot be used to avoid risks that occur in the sea when the ship sails. In the implementation of project activities, the company must understand the right network so that there are no problems scheduling, planning and controlling project activities. This study aims to solve the problems faced by the company, is the delay in completion time. The data used is secondary data related to the sequence and relationship of activities, execution time, and cost budget plan (RAB). This study uses CPM and PERT methods to determine the optimal turn around time using critical path and probability concepts. The results of the CPM and PERT methods are activities on the critical path with an optimal duration of 98 days. The crashing method is to reduce the duration to 72 days with savings of Rp. 16,351,708. if the project implementer does not crash, the penalty that must be paid is Rp. 3,072,963,905.
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Saravanan, A. S., Jayalakshmy Ramachandran, A. Seetharaman, Karripur Nanda Kumar, and Kailash C. Joshi. "Empirical Analysis of Factors Influencing Use of Internet on Ships." JABM JOURNAL of ACCOUNTING - BUSINESS & MANAGEMENT 1, no. 25 (August 14, 2018): 35. http://dx.doi.org/10.31966/jabminternational.v1i25.328.
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The purpose of this study was to evaluate the factors influencing the emergence of internet on ships and the resultant cost. Data collected from 255 respondents, mainly seafarers (captain and officers) and shore- based ship managers revealed that emergence of the internet on ships is influenced by perceived usefulness, organisation readiness, external pressure and technology penetration. It is also witnessed that cost of internet on ships has an effect on the penetration of the internet and new technology. The emergence of the internet on ships provides an effective communication link with all stakeholders of the ship, enhances safety and security with real time data on cargo, incidents, piracy, terrorism and weather conditions. It facilitates timely delivery of stores and spare parts for ship repairs and maintenance, thus providing immense satisfaction to all stakeholders. It thus has a significant impact on the industry.
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Chae, Chong-Ju, Mingyu Kim, and Hyung-Ju Kim. "A Study on Identification of Development Status of MASS Technologies and Directions of Improvement." Applied Sciences 10, no. 13 (June 30, 2020): 4564. http://dx.doi.org/10.3390/app10134564.
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The introduction of the maritime autonomous surface ship (MASS) to the maritime industry will open up a new era and bring about a new paradigm shift in terms of cost efficiency, maritime accidents, and human resources. Various studies are currently being conducted to realize the MASS. Understanding the scope and direction of these studies will be of great help for future MASS research. In this study, the current development status of technologies for autonomous ships is identified, and considerations and directions of improvement are suggested for six major research fields that cover all technological issues of MASS. Firstly, the results of the regulatory scoping exercise (RSE) on the International Maritime Organization (IMO) conventions to accept MASSs are identified; in particular, human elements are identified as vital issues to be considered for the design and operation of MASSs. Secondly, various studies on the decision-making system are identified, and the future direction is suggested. Thirdly, in terms of ship design and propulsion system, design changes for autonomous cargo ships are investigated, with their potential impacts to be considered. Fourthly, the communication system will need to be robust and supported by multiple systems to minimize potential risk with third-party infrastructures, and suitable protection of systems, networks, and data will be required as an integral part of the safety system for cybersecurity. Fifthly, issues of maintenance and repair are identified, with a maintenance strategy to be considered. Lastly, hazard analysis of the autonomous ship is explored, and system-theoretic process analysis (STPA) and the functional resonance analysis method (FRAM) are identified as the most representative new methods that can be used for hazard analysis of autonomous ships.
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VERMA, AJIT KUMAR, A. SRIVIDYA, ANIL RANA, and SANJAY K. KHATTRI. "OPTIMIZATION OF MAINTENANCE SCHEDULING OF SHIP BORNE MACHINERY FOR IMPROVED RELIABILITY AND REDUCED COST." International Journal of Reliability, Quality and Safety Engineering 19, no. 03 (June 2012): 1250014. http://dx.doi.org/10.1142/s0218539312500143.
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Ships have a wide variety of machinery available onboard that is crucial for her sustenance at sea for prolonged durations. The machinery can be grouped into various plants, such as propulsion plant, air conditioning plants, power generation plants, etc., each having its own specific function. The plants in turn are composed of various systems which further comprise various types of machinery. There are redundancies built in at the plant level, as well as at the system and at machinery level, so as to improve the reliability of the ship as a whole. Planning of maintenance schedule, specifically for tasks which can only be undertaken in an ashore repair yard is a daunting task for the maintenance managers. The paper presents a NSGA-II (nondominated sorting genetic algorithm) based multi-objective optimization approach to arrive at an optimum maintenance plan for the vast variety of machinery in order to improve the average reliability of ship's operations at sea at minimum cost. The paper presents the advantages that can accrue from introducing short maintenance periods for a select group of machinery, within the constraints of mandatory operational time, over the method of following a common maintenance interval for all the machinery. The problem function in hand is nonlinear, multi-modal and multi-objective in nature. The search spaces for the problem is noncontinuous and the (multiple) variables, such as time interval for maintenance, serial number of equipment, number of minor maintenance actions, etc., are uncoded real parameters.
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ABLAEV, A. R. "ANALYSIS OF METHODS FOR INCREASE OF EFFICIENCY OF SHIP DIESELS OPERATION WITH RESTORED PISTONS HEADS." Fundamental and Applied Problems of Engineering and Technology 4, no. 1 (2020): 117–21. http://dx.doi.org/10.33979/2073-7408-2020-342-4-1-117-121.
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Recommendations on maintenance for increase of efficiency of ship diesels operation with restored pistons heads, necessity of perfecting of the ways and the criteria of repair of heads of pistons of slow-speed engines for receipt of the details with running abilities, maximally effective in modern conditions of functioning are considered in this article.
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Rana, Anil. "Optimal maintenance level of equipment with multiple components." Journal of Quality in Maintenance Engineering 22, no. 2 (May 9, 2016): 180–87. http://dx.doi.org/10.1108/jqme-07-2014-0043.
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Purpose – The purpose of the paper is to provide a method for selection of an optimum level of repair by replacement of an equipment based on its cost. In a ship where the engineer has a vast variety of equipment and systems to operate and maintain within limited time frames and availability of human resources, it is often difficult to disassemble a whole equipment to replace a faulty component. It is instead a lot easier to just replace the faulty equipment with whole new equipment. However, such a decision comes at an enormous capital cost. Therefore, the key question is, can we have a model to help us arrive at a decision on the correct level of carrying out repairs? Design/methodology/approach – The paper uses a model based on cost and convolution of failure distributions of critical sub-components of an equipment. Necessary assumptions based on real life experience have been incorporated in the model. Findings – The paper used an example of a particular type of motor driven sea water centrifugal pump which was commonly used in main engine sea water system, firefighting system, air conditioning system, etc. The pump had one of the highest failure rates in the ship (approximately one failure per 150 days) and the engineers found it cost and time effective to replace the entire pump on failure rather than carrying out replacement of the failed components. The model analyzed that the engineer’s hunch was not off the mark. Research limitations/implications – The implication of the work presented in the paper will be savings in maintenance cost and downtime due to optimal level of repairs on a multi-component equipment. The limitations of the work are assumption of independence of failures of components. This may not be true in all the cases. Further, opportunity based maintenance has also not been considered. Originality/value – The originality of the paper lies in the presentation of a method for selection of an optimum level of maintenance for a multi-component equipment
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Blatchley, Charles, Joseph Connors, and Anthony Vecino. "An Integrated Approach to Shipboard System and Equipment Testing for Improved Maintenance Management." Marine Technology and SNAME News 26, no. 02 (April 1, 1989): 105–19. http://dx.doi.org/10.5957/mt1.1989.26.2.105.
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Commercial operators today are required to maintain maximum vessels in-service levels and, with government vessel operators competing for decreasing operating funds, the management of ship maintenance and repair (M&R) has become a highly visible area which can have a significant impact on overall vessel operating costs. As an approach to consolidate, improve, and simply better manage a vessel's state of material condition and M&R requirements, an integrated shipboard Material Condition Assessment Program can be implemented which provides a comprehensive evaluation and assessment of the various critical components on a ship-specific basis. This approach will integrate all vessel material condition assessment techniques and periodic surveys whose results can be used for advanced maintenance planning and budgeting. The approach and methodology employed and described in this paper are not new, having been tried and proven to varying degrees in the marine and related industrial fields, and are considered within the constraints of day-to-day vessel operation and maintenance management.
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MAYER, BRIAN, SHAHRUKH IRANI, and HOSNI ADRA. "Virtual Shop Clusters: A New Layout Concept for a Ship Repair and Maintenance Facility." Naval Engineers Journal 120, no. 2 (October 2008): 99–111. http://dx.doi.org/10.1111/j.1559-3584.2008.00128.x.
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Platonova, Nonna. "The fishery in the northern regions of the Far East of the USSR in the context of late Soviet modernization." SHS Web of Conferences 112 (2021): 00020. http://dx.doi.org/10.1051/shsconf/202111200020.
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The article describes the development of the fishing industry in Kamchatka, Sakhalin, and Magadan regions in 1965-1985. In a general historical context, the article pays attention to the modernization processes in the fishery of the northern regions of the Far Eastern territory, emphasizing general trends and differences in their dynamics. The special importance and level of development of the material and technical base of the fishing industry is noted. The article reveals the working conditions of ship repair enterprises and the reasons for the financial deficit of ship repair. Statistical data on the accident rate of fishing vessels of the branch administrations of Kamchatka, Sakhalin, and Magadan are analyzed. The results of the introduction of 200-mile economic zones that complicated the fishing activities of enterprises and the fleet of the fishing industry in the northern regions of the Soviet Far East are shown. It was found that social and economic experiments in the late Soviet period and modernization, which was carried out from above by the political elite, did not eliminate disproportions in the development of the fishery. Territorial remoteness, difficulties of timely material and technical supply and ship repair and maintenance problems were difficult-to-overcome challenges which accelerated the systemic crisis in the fishery.
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Nuchturee, Chalermkiat, Tie Li, and Hongpu Xia. "Design of Cost-Effective and Emission-Aware Power Plant System for Integrated Electric Propulsion Ships." Journal of Marine Science and Engineering 9, no. 7 (June 22, 2021): 684. http://dx.doi.org/10.3390/jmse9070684.
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Extensive electrification of ship power systems appears to be a promising measure to meet stringent environmental requirements. The concept is to enable ship power management to allocate loads in response to load variations in an optimal manner. From a broader design perspective, the reliability of machinery operation is also of importance, especially with regard to the failure cost from power outages. In this paper, an approach for determining optimal power plants based on economic and environmental perspectives across several architecture choices is proposed. The design procedure involves the implementation of metaheuristic optimization to minimize fuel consumption and emissions released, while maintenance and repair services can be extracted using reliability assessment tools. The simulation results demonstrated that ship power management using the whale optimization algorithm (WOA) was able to reduce fuel consumption and corresponding emissions in a range from 4.04–8.86%, varying with the profiles, by eliminating inefficient working generators and distributing loads for the rest to the nearest possible energy-saving areas. There was also a trade-off between maintenance service and overall system expenses. Finally, a compromise solution was sought with the proposed holistic design for contradictory cost components by taking into account fuel operation consumption, shore electricity supply, maintenance service and investment expenditure.
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Widyaningsih, U., Sutoyo, A. A. N. P. Yuda, A. Mirianto, Z. Zuhri, and N. V. Harini. "The Design of Ship Operation Cost Estimation Simulator Uses a Case Study of The Bung Tomo Trainer Ship." IOP Conference Series: Earth and Environmental Science 1081, no. 1 (September 1, 2022): 012008. http://dx.doi.org/10.1088/1755-1315/1081/1/012008.
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Abstract Calculation of ship operating costs is the main element in determining tariffs, since determining the high and low rates is very important in the shipping business. In other words, determining the right ship operating costs is the key to the success of the shipping business. Vessel operating costs are determined by direct and indirect operational costs. Direct operational costs include capital costs, insurance costs, insurance premiums, crew costs, fuel costs, lubricant costs, grease costs, fresh water costs, port costs and Repair, Maintenance, Supply (RMS) costs. The indirect operational costs include branch office costs and admin costs. Calculation of ship operating costs can actually be done manually, but it will take a lot of time. So, we need a way to calculate the operational costs of ships that are easy and efficient. In this study we developed an application to calculate ship operating costs. Then we call this application a simulator. From the simulations carried out, the results obtained that the results of calculations using the simulator are the same as the results of manual calculations, namely the total cost in rupiah. The advantage of this simulator is that it saves calculation time, so that the results obtained are easier and more efficient. In addition, the appearance of the simulator is very good in accordance with the demands of the digitalization of sea transportation and this simulator can be used by all groups because it is easy to operate.
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Guervilly, Jean-Hugues, Marion Blin, Luisa Laureti, Emilie Baudelet, Stéphane Audebert, and Pierre-Henri Gaillard. "SLX4 dampens MutSα-dependent mismatch repair." Nucleic Acids Research 50, no. 5 (February 15, 2022): 2667–80. http://dx.doi.org/10.1093/nar/gkac075.
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Abstract The tumour suppressor SLX4 plays multiple roles in the maintenance of genome stability, acting as a scaffold for structure-specific endonucleases and other DNA repair proteins. It directly interacts with the mismatch repair (MMR) protein MSH2 but the significance of this interaction remained unknown until recent findings showing that MutSβ (MSH2-MSH3) stimulates in vitro the SLX4-dependent Holliday junction resolvase activity. Here, we characterize the mode of interaction between SLX4 and MSH2, which relies on an MSH2-interacting peptide (SHIP box) that drives interaction of SLX4 with both MutSβ and MutSα (MSH2-MSH6). While we show that this MSH2 binding domain is dispensable for the well-established role of SLX4 in interstrand crosslink repair, we find that it mediates inhibition of MutSα-dependent MMR by SLX4, unravelling an unanticipated function of SLX4.
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Maltais, Alexandrine, Nikola Petrov, Michel Thibault, and Benoit Bissonnette. "UHPFRC for concrete repair." MATEC Web of Conferences 199 (2018): 07007. http://dx.doi.org/10.1051/matecconf/201819907007.
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As part of the St. Lawrence Seaway lock maintenance, the current practice is to perform concrete repairs entirely with reinforced concrete, using either ordinary concrete or high performance concrete (HPC) mixtures. However, with the recent advances in the field of ultra-high performance fiber-reinforced concrete (UHPFRC), the use of this new material is considered in view of improving the overall performance of repairs. The goal is to implement repairs capable of dissipating a lot of energy before breaking when a ship hits a concrete lock wall. Numerous rehabilitation materials and methods have been experimented in the past. They all were unsuccessful due to inadequate shear and impact strength characteristics of the repair materials used. These needs can be efficiently fulfilled with UHPFRC, with their superior mechanical properties and very high energy-dissipation ability. To analyze the in-situ behavior of UHPFRC, two main mixture designs were investigated: a 160-MPa mixture containing 3% of steel fibers and a 120-MPa mixture containing 3.5% of a steel fiber blend. Thick repairs with average depths of 700 mm were carried out during the winter shut down period, in very harsh climatic conditions (-12 °C, gusty wind). The performance exhibited by the repairs after a full year shows that UHPFRCs can withstand very effectively the impacts from the transiting vessels
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Kawamura, Y., and Y. Sumi. "Information System for Structural Integrity of Ships." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 219, no. 2 (June 1, 2005): 93–106. http://dx.doi.org/10.1243/147509005x10422.
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The maintenance of ship structures is very important to avoid serious casualties such as oil spill from tankers. For this reason, it is necessary to detect and evaluate the state of the damages properly. In this paper, a new concept of an information system for structural integrity of ships is proposed in order to improve the safety and to assess the condition of structural strength in service. In this system, all information of damages in a certain ship obtained from hull surveys is managed in an information database, allowing assessments to be made at any time in the ship's life of the present structural integrity status or provisions to be made for the future. By using the proposed concept it becomes possible to provide a valuable tool for repair management and planning. One of the advantages of this concept is that reasonable and advanced assessment of an aged ship is readily achievable by using the information about damages and the three-dimensional structural data stored in the database. Based on the proposed concept, a prototype system for the evaluation of corrosion damages is developed by using the STEP (standard for the exchange of product model data) technologies with the proposal of a data model of the information system. Also, a method for the import of ship structural data into the database is studied for practical development of the system. Moreover, a framework for the generation of analysis models for strength of aged ships is proposed, by which labour saving is possible using a generating analysis model. The validity of the effectiveness of the proposed concept is shown with some examples.
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E., MANEA. "Assessments regarding the planning and control of activities and resources for ship repair and maintenance works." Scientific Bulletin of Naval Academy XXIV, no. 1 (July 15, 2021): 201–10. http://dx.doi.org/10.21279/1454-864x-21-i1-024.
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The repair and maintenance operations carried out within a shipyard are correlated with the process of ensuring and managing the resources necessary to carry out the works included in the technical specification. Resource planning is a complex issue that can be addressed from several points of view. Initially, the planning of activities is done taking into account only the analysis of the time parameter and the dependencies between activities imposed by the technological process. The practice of the activities carried out in a shipyard has demonstrated that an analysis of the necessary resources according to the existing availability is also necessary. There are many unforeseen situations that can affect both the time of work and resources (material, financial, human) thus complicating the process of planning activities. This paper proposes a way to analyze the resource requirements of a repair project based on available resources, through Critical Path Method diagrams. This provides a comparative view of the daily required profile for a particular resource associated with the project in respect to the daily available profile of the shipyard.
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Panchuk, Myroslav, Aleksander Sładkowski, Andrii Panchuk, and Iryna Semianyk. "New Technologies for Hull Assemblies in Shipbuilding." Naše more 68, no. 1 (February 2021): 48–57. http://dx.doi.org/10.17818/nm/2021/1.6.
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The modern stage of shipbuilding industry development is characterized by an intense competition and the beginning of introduction of new materials and effective welding technologies, which change the appearance of this quite conservative field, at leading global shipbuilding enterprises. In particular, the application of laser technologies during ship construction decreases the cost of hull manufacturing by 30%, increases the production capacity by 10%, and reduces welding deformations by 30% compared to traditional welding methods. The application of composite materials for ship construction allows decreasing the ship weight by 10%, which leads to 1-7% decrease in fuel consumption, reduction of polluting emissions and significant saving of expenditures. Adhesion-bonded joints become more frequently used in shipbuilding, as they off er a possibility of joining different materials along with the advantages brought by the adhesion process itself, being reliable, cost-efficient and ensuring easy maintenance and repair.
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Stevan, Paul, Triwilaswandio Wuruk Pribadi, and Sufian Imam Wahidi. "Computer-Based Android Application for Vessel’s Condition Survey by Owner Surveyor." Applied Mechanics and Materials 874 (January 2018): 165–73. http://dx.doi.org/10.4028/www.scientific.net/amm.874.165.
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Ship condition survey is a survey conducted by an Owner Surveyor for reporting the actual condition of the ship and parts. Presently, the condition survey is still done manually that Owner Surveyor has to survey based on survey list which is published by the ship’s owner company. The survey result will be presented in the form of a report, which will be submitted to ship’s owner as consideration for doing repair and maintenance. The survey process which done presently is not effective and many Owner Surveyors have not sufficient knowledge and experience, and also the process of presenting a survey report which takes a long time. This project was implemented by built an android-based computer application that can assist an Owner Surveyor in the process of a condition survey. This application containes of survey list, survey review, updating survey, and several menus to facilitate Owner Surveyor in the condition survey. This application has been tested by a few respondents who have experience in surveying ships and who have an educational background of naval architecture and shipbuilding engineering. This test was done in the form of a questionnaire aimed to determine the respondents assessment of this application. From the results of the questionnaire could be concluded that the application is very useful in supporting ship condition survey.
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Darmanto, Seno, Sutanto Sutanto, Sulaiman Sulaiman, and Eko Julianto Sasono. "APLIKASI TEKNOLOGI SEDERHANA DAN PERMESINAN UNTUK MENINGKATKAN KEAHLIAN RENOVASI LAMBUNG PERAHU." J-ABDIPAMAS (Jurnal Pengabdian Kepada Masyarakat) 2, no. 1 (April 25, 2018): 53. http://dx.doi.org/10.30734/j-abdipamas.v2i1.157.
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ABSTRACTApplications of technology and machinery equipment in service activities are done to complete the renovation and repair of boats or wooden vessels. Development of the infrastructure for members of the fishermen group is currently focused on equipment for the repair and renovation of the boat hull and the maintenance of the driving machine. And for the improvement of the renovation or repair of the boat hull, the service team has compiled a working activity including understanding and deepening of boat or wooden boats, engineering and equipment for renovation and boatbuilding, understanding and deepening of ship damage, and implementation in a group of fishermen. The process of maintenance and repair of boats on the ship's body (hull) in fishermen partners in principle were carried out through several stages include the washing and cleaning of all parts of the ship, patching, coating and painting. The process of painting through several stages of surface cleaning, patching if there are starting cracks and holes, drying, smoothing, basic coating and painting. Some tools for boats maintenance and repair especially for renovation and manufacture of wooden boats consist of saws (machines and manuals), drills, fittings, grinders, cutting (various sizes), clamps and other support equipmentKeywords: boat, hull, propulsion machine, machinery ABSTRAKKegiatan pengabdian aplikasi teknologi dan peralatan permesinan dilakukan untuk menyempurnakan renovasi dan perbaikan perahu atau kapal kayu. Pengembangan kelengkapan sarana anggota kelompok nelayan pada saat ini difokuskan pada peralatan untuk perbaikan dan renovasi lambung atau bodi dan perawatan mesin penggerak. Dan untuk penyempurnaan renovasi atau perbaikan kapal kayu, tim pengabdian menyusun langkah kerja atau kegiatan pengabdian meliputi pemahaman dan pendalaman perahu atau kapal kayu, teknik dan peralatan renovasi dan pembuatan perahu, pemahaman dan pendalaman kerusakan kapal, dan sejenisnya dan pelaksanaan di kelompok nelayan. Proses perawatan dan perbaikan kapal pada bagian badan kapal (lambung kapal) di mitra nelayan pada prinsipnya dilakukan melalui beberapa tahapan meliputi pencucian seluruh bagian kapal, penambalan (pemakalan), pendempulan dan pengecetan kapal. Proses pengecatan melalui beberapa tahapan yakni pembersihan permukaan, penambalan kalau ada yang mulai retak dan berlubang, pengeringan, penghalusan, pelapisan dasar dan pengecatan. Beberapa peralatan perawatan dan perbaikan lambung perahu terutama untuk renovasi dan pembuatan perahu kayu meliputi gergaji kayu (mesin dan manual), bor, pasah, gerinda, tatah (berbagai ukuran), clem/pencepit dan peralatan pendukung lain.
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BURSZTYŃSKI, Andrzej. "LOGISTIC ASPECTS OF RESTORING SHIP’S TECHNICAL EFFICIENCY." Scientific Journal of the Military University of Land Forces 158, no. 4 (October 1, 2010): 46–60. http://dx.doi.org/10.5604/01.3001.0002.2725.
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A ship’s combat readiness is significantly dependent on the technical worthiness of basic ship equipment and mechanisms. Technical worthiness is determined by operation rates and depends on the condition of equipment. While using military equipment, one may expect the wear and tear of systems resulting from physical ageing, operation or combat damage. The restoration of ship’s technical efficiency is completed after returning to the harbour or during operations at sea. The tasks of restoring technical efficiency are performed in harbours and in naval bases by ashore elements of the repair system. During operations at sea a crew is able, to a limited extent, to carry out basic technical maintenance. The restoration of the technical worthiness and efficiency of ship equipment depends on appropriate logistic support.
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Suharyo, Okol Sri, Ayip Rivai Prabowo, and Eko Krisdiono. "Decision making of maritime development scenario on the impact of naval base for supporting navy ships operations." Decision Science Letters 11, no. 1 (2022): 81–90. http://dx.doi.org/10.5267/j.dsl.2021.8.002.
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The Indonesian Navy is the spearhead in maintaining maritime security in Indonesian waters. In carrying out its main tasks, the Indonesian Navy has components of an Integrated Fleet Weapon System in which there are elements of Ships and Naval Bases. To ensure the effectiveness of carrying out operations by ship elements, ship operations are supported by the Naval Base as the organizer of the support function. Naval Base's carrying capacity consists of 5 (five) support functions, including: (1) support for anchoring facilities; (2) support for supply facilities; (3) support for maintenance and repair facilities; (4) support facility maintenance personnel; and (5) support for base development facilities. Naval Base does not yet have its dock to support anchoring facilities for ship operations. In addition to cooperation in the use of the Naval Base anchorage facility, there is also cooperation in port security, both in terms of land and port water aspects. As the number of ship visits at Naval Base Harbor increases, the dock utility increases. The increase in dock utility resulted in a decrease in port services which also resulted in a decrease in the Naval Base Carrying Capacity. To improve port services, Pelindo III implements the port development program contained in the Naval Base Port Master Plan in Permen KP number 792 of 2017. In this study, an analysis of the impact of the Naval Base Port development policy on the carrying capacity of the Naval Base was carried out. The data analysis uses System Dynamics modeling with a simulation period of 30 years in 3 development scenarios, namely short-term scenarios, medium-term scenarios, and long-term scenarios. From the simulation results, it is found that the construction of the Naval Base port affects the Naval Base Carrying Capacity with an average increase of 1.8% in each policy scenario. The increase in Naval Base Carrying Capacity has an effect on increasing Ship Operations by an average of 1.8% and also increasing the Security of Naval Base Harbor by an average of 0.14%. The results of the analysis of this study can be used as consideration for policymaking by the Navy.
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Jiang, Ge, Dingzhong Feng, and Weihang Zhu. "A Large and Heavy Cargo Transport System Designed for Small and Medium Ship Maintenance and Repair." Journal of Ship Production and Design 33, no. 3 (August 1, 2017): 212–20. http://dx.doi.org/10.5957/jspd.33.3.160019.
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