• Title/Summary/Keyword: Crane weight increase

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Design of Container Crane Controller for High Productivity in Cargo Handling (하역생산성 향상을 위한 컨테이너 크레인의 제어기 설계)

  • 최재준
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2000.05a
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    • pp.28-35
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    • 2000
  • For the merit of a container in transportation and cargo handling the amount of container freight has been continuously on the increase. On the other hand container crane had got the bottle neck in cargo handling due to low productivity so that freight congestion had been often occurred at ports. in this paper A mathematical model for container crane system is represented a method for designing a fuzzy controller of container crane system for high productivity in cargo handling is presented. The fuzzy controller is compared with other optimal controller at the same condition. in the computer simulation the fuzzy controller obtained an excellent response to reference change better than the optimal controller. For disturbance such as a strong storm and parameter change due to change of cargo weight the result was also stable and robust than the optimal controller.

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Development of The High-Speed Container Handling System with On-Chassis Type (온-섀시 방식의 고속 컨테이너 하역시스템 개발)

  • Choi, Kook-Jin
    • Journal of the Korean Society of Industry Convergence
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    • v.23 no.2_2
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    • pp.323-332
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    • 2020
  • Container ships are getting bigger due to the increase in global cargo volume. Therefore, it needs to increase the speed for loading and unloading of containers at the quayside. Traditionally, only one container is handled at once at the quayside due to it's heavy weight. In this paper, a method of handling multiple containers at once using chassis is proposed. Proposed system is consists of a container chassis that can hold three layer stacked containers, transport system that can handle the container chassis including rail-based or vehicle-based roll-on roll-off systems, and dedicated crane system. The conceptual design of crane and transport system that can handle three stacked containers is carried out and verified. The proposed system can be adopted for real quayside container handling system with high speed.

Dynamic Weight Adjustment Algorithms for Deriving Stacking Policies of Automated Container Terminals (자동화 컨테이너터미널의 장치 위치 결정을 위한 동적 가중치 조정 알고리즘)

  • Kim, Young-Hun;Park, Tae-Jin;Ryu, Kwang-Ryel
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2007.12a
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    • pp.255-256
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    • 2007
  • In case of inappropriate stacking position of the container taking in container yard, the working time for the container would be delayed in taking out because of the occurrence of the re-handle and the increase of the crane moving time. We have to take into account a variety of elements like the crane interference, the container group and stacking height in order to determine the optimal stacking position and decide the weight reflecting the importance of these criteria. We propose the dynamic weight adjustment algorithm for the stacking policy criteria employing the online search in this research.

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Stability Characteristics based on Crane Weight of Small Fishing Vessels Under Standard Loading Conditions: Investigation Report of the Capsize Accident at Goseong Port (크레인 교체에 따른 표준재화 상태에서의 소형 어선의 복원성 특성 - 고성항 전복 사고 재결서 중심 -)

  • Kang, Dae Kon;Lee, Gun Gyung;Lee, Jun Ho;Han, Seung Hun
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.26 no.1
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    • pp.22-30
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    • 2020
  • In March 2016, a 6.67-ton fishing boat capsized owing to the loss of stability during crane operations. Capsizing occurs when a boat or ship is flipped over (or turned upside down) for reason other than accidents caused by collisions, contact, stranding, fire or explosion. Over the past nine years (2010-2018), capsize accidents have accounted for 2.34 % of all marine accidents and are gradually increasing. The loss of stability from improper shipping is the main cause of most capsizes, especially for small fishing vessels weighing 10 tons. According to the Fishing Vessel Act, small fishing vessels weighing less than a ton are exempted from inspections on stability and load cranes. This study analyzes the issue cited as the reason for the capsizing of the small fishing boat in Goseong, namely, the reduction of restoring moment due to increased weight of the crane. Fishing boats with similar loading conditions were modeled on the basis of re-determination, and their stability before and after the accident was assumed. The fishing boats with heavier cranes were found to be at higher risk of capsizing owing to the reduction of the restoring moment and the angle of deck immersion. Under standard loading conditions, the stability moments of fishing vessels are lesser during fishing, compared to when they depart from or arrive at the port.

Design and Implementation of the Simulator for Evaluating the Performance of Container Cranes (컨테이너크레인 성능평가를 위한 시뮬레이터 설계 및 구현)

  • Won, Seung-Hwan;Choi, Sang-Hei
    • Journal of Intelligence and Information Systems
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    • v.15 no.3
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    • pp.119-136
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    • 2009
  • According to the increase of container flows and the appearance of large-sized container vessels, the container handling equipment in ports is evolving continuously. This research introduces the simulation model for evaluating in detail the mechanical productivity of container cranes. The model considers a single trolley and dual trolleys as the mechanism of a container crane and a single lift, a twin lift, and a tandem lift as the spreader type of it. Additionally, the detail specifications such as the dimension and the speed of a container crane are inputted and the kinematic characteristics of it are simulated. The model also considers the size of a vessel, the storage position of containers in the vessel, and the weight of containers as external physical constraints. Experimental conditions can be configured conveniently because various parameters in the model are separated. Moreover, the model can accommodate flexibly new equipment types and the changes of the existing equipment because it is designed and developed in object-oriented concept.

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Remarshalling Planning for Multiple Automated Yard Cranes Considering Slack Time (여유시간을 고려한 다수 자동화 야드 크레인의 이적작업 일정계획)

  • Park, Young-Man
    • Journal of Navigation and Port Research
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    • v.41 no.3
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    • pp.149-154
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    • 2017
  • Recently, container terminal operators have made efforts to develop an efficient remarshalling plan in response to the increase in automation of equipment handling and transport of containers in the terminals. Usually, containers are handled by multiple AYCs(automated yard cranes) in-yard in an automated container terminal, and terminal operators establish a remarshalling plan using slack time to increase the efficiency of ship operation. This study develops the optimal mathematical model through mixed integer programming as a solution to the problem of dispatching multiple AYCs. Considering the difficulty of direct application to the field due to computation time, we analyze the five prototypical dispatching rules for real world adaptation. A numerical experiment found that the maximum weight ratio (MR) rule and the maximum weight (MW) rule are the ideal dispatching solutions to the multiple AYCs dispatching problem.

Application Study of High-Strength Steel(HSA800) for the Special Structure (특수구조 대상으로 고강도 강재(HSA800)의 현장 적용성 연구)

  • Kim, In-Ho;Lee, Hee-Su;Park, Sung-Yong;Kim, Jong-Soo
    • Journal of Korean Association for Spatial Structures
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    • v.14 no.2
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    • pp.69-78
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    • 2014
  • The purpose of this study is to increase applicability of high strength steel, HSA800 to the structure. Selected study of structure is to consider high strength steel, and following parts, 1) Tensile member with no consider of buckling, 2) Truss existing both tension and compression members with small slenderness ratio. This studied structure is included tension column hang on to the upper bridge truss. The structure element quantity with apply HSA800 instead of SM570 is reduced about 38.9% of tension column and 29.7% of bridge truss. In addition, the number of element's division is reduced about two sections due to reduction of self weight that the crane is able to lift up. This improves to reduce erection sequence and construction period which can save about a month. All connections are reviewed as welding and bolt. Also, the cost of welding is reduced about 41.3% due to apply HSA800. In conclusion, applying HSA800 to the hanging structure aggressively can secure economic and constructability.

Development and Performance Evaluation of a Filtration Equipment to Reuse PFC Waste Solution Generated on PFC Decontamination (PFC 제염 시 발생된 PFC 폐액의 재사용을 위한 여과장치 개발 및 성능평가)

  • Kim Gye-Nam;Jeong Cheol-Jin;Won Hui-Jun;Choi Wang-Kyu;Jung Chong-Hun;Oh Won-Zin;Park Jin-Ho
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.4 no.2
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    • pp.161-170
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    • 2006
  • PFC(Perfluorocarbon) decontamination process is one of best methods to remove hot particulate adhered on the inner surface of hot cell and surface of equipment in hot cell. It was necessary to develop a filtration equipment to reuse the PFC waste solution generated on PFC decontamination due to the high cost of PFC solution and for minimization of the volume of second waste solution. The filtration equipment was developed to remove hot particulate in PFC waste solution. It was made suitable size and weight in consideration of hot cell gate and crane. And it has wheels for easy movement. Flux of the filtration equipment decreased with particulate concentration increase. It consists of pre-filter($1.4{\mu}m$) and final-filter($0.2{\mu}m$) for protection of the flux decrease along filtration time. It treatment capacity of waste solution is 0.2 L/min.

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