• 제목/요약/키워드: paper crane

Search Result 581, Processing Time 0.022 seconds

3MW Class Offshore Wind Turbine Development (3MW급 해상풍력 발전시스템 개발)

  • Joo, Wan-Don;Lee, Jeong-Hoon;Kim, Jeong-Il;Jeong, Seok-Yong;Shin, Young-Ho;Park, Jong-Po
    • 한국신재생에너지학회:학술대회논문집
    • /
    • 2009.06a
    • /
    • pp.491-494
    • /
    • 2009
  • This paper introduces the design concepts and characteristics of WinDS3000$^{TM}$ which is a trade mark of Doosan's 3MW offshore/onshore wind turbine. WinDS3000$^{TM}$ has been designed in consideration of high RAMS (Reliability, Availability, Maintainability and Serviceability) and cost effectiveness for the TC Ia condition in GL guideline. An integrated drive train design with an innovative three-stage gearbox has been introduced to minimize nacelle weight of the wind turbine and to enhance a high reliability for transmission. A permanent magnet generator with full converter system has been introduced to get higher efficiency in part load operation, and grid friendliness use of 50 Hz and 60 Hz grid. A pitch regulated variable speed power control with individual pitch system has been introduced to regulate rotor torque while generator reaction torque can be adjusted almost instantaneously by the associated power electronics. An individual pitch control system has been introduced to reduce fatigue loads of blade and system. The wind turbine has been also equipped with condition monitoring and diagnostic systems in order to meet maintainability requirements. And internal maintenance crane in nacelle has been developed. As a result, the maintenance cost was dramatically reduced and maintenance convenience also enhanced in offshore condition.

  • PDF

DESIGN OF AN UNMANNED GROUND VEHICLE, TAILGATOR THEORY AND PRACTICE

  • KIM S. G.;GALLUZZO T.;MACARTHUR D.;SOLANKI S.;ZAWODNY E.;KENT D.;KIM J. H.;CRANE C. D.
    • International Journal of Automotive Technology
    • /
    • v.7 no.1
    • /
    • pp.83-90
    • /
    • 2006
  • The purpose of this paper is to describe the design and implementation of an unmanned ground vehicle, called the TailGator at CIMAR (Center for Intelligent Machines and Robotics) of the University of Florida. The TailGator is a gas powered, four-wheeled vehicle that was designed for the AUVSI Intelligent Ground Vehicle Competition and has been tested in the contest for 2 years. The vehicle control model and design of the sensory systems are described. The competition is comprised of two events called the Autonomous Challenge and the Navigation Challenge: For the autonomous challenge, line following, obstacle avoidance, and detection are required. Line following is accomplished with a camera system. Obstacle avoidance and detection are accomplished with a laser scanner. For the navigation challenge, waypoint following and obstacle detection are required. The waypoint navigation is implemented with a global positioning system. The TailGator has provided an educational test bed for not only the contest requirements but also other studies in developing artificial intelligence algorithms such as adaptive control, creative control, automatic calibration, and internet-base control. The significance of this effort is in helping engineering and technology students understand the transition from theory to practice.

Simulation model for performance estimation of transport vehicle on automated container terminal (자동화 컨테이너 터미널의 이송장비 운영평가를 위한 시뮬레이션 모델)

  • 하태영;최용석;김우선
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
    • /
    • 2004.04a
    • /
    • pp.443-449
    • /
    • 2004
  • In this paper, we established a simulation model for transport vehicle that carries the container transportation between apron and yard block on automated container terminal with a perpendicular yard layout. Usually, the efficiency of container terminal is evaluated by productivity of container cranes at apron, and though there are enough support of transport vehicles and yard cranes, can improve the productivity of container cranes. Especially, transport vehicle is very important factor in productivity of container cranes and has variable work productivity according to loading and unloading situation of container cranes. Therefore, a method that can estimate work productivity of transport vehicle efficiently is required. We analyzed work productivity of transport vehicle using simulation model that has state transition of transport vehicle. We performed various simulation experiment and analyzed work productivity of transport vehicle and calculated the required number of transport vehicle by container crane additionally.

  • PDF

Efficient Yard Tractor Control Method for the Dual Cycling in Container Terminal (효율적인 듀얼 사이클을 위한 야드 트랙터 통제 방법)

  • Chung, Chang-Yun;Shin, Jae-Young
    • Journal of Navigation and Port Research
    • /
    • v.36 no.1
    • /
    • pp.69-74
    • /
    • 2012
  • Recent global supply chain, improving the efficiency of container shipping process is very important. In the overseas shipping of goods, the voyage of super containership is common to overcome amount of increasing cargo. Thus, container terminal managers make an experiment on the double cycle and dual cycle operation, which ship loading and unloading were carried out simultaneously, for maximizing the productivity of quay side. Yard Tractors(YTs) pooling methods also are introduced for increasing the efficiency of assignment of YTs. In this paper, we analyzed the efficiency of dual cycling through comparing existing pooling methods with the modified method for the dual cycling. We developed a simulation model using simulation analysis software, Arena. The result of experiment shown that the more dual cycling don't always increase the gross crane rate(GCR), which means productivity of quay cranes(QCs) per hour.

A Heuristic Approach to Scheduling Multiple Cranes for Intra-Block Remarshalling (복수 크레인을 활용한 블록 내 컨테이너 이적 계획)

  • Oh, Myung-Seob;Kang, Jae-Ho;Ryu, Kwang-Ryel;Kim, Kap-Hwan
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
    • /
    • v.29 no.1
    • /
    • pp.413-421
    • /
    • 2005
  • Intra-block remarshalling is the task of rearranging into some target bays those containers which are scattered within around the block. If multiple transfer cranes installed in the block are all used together we may be able to complete the remarshalling task as early as possible. However, when multiple cranes are used simultaneously, there may occur significant delays if we do not carefully consider interferences between the cranes at the time of scheduling. Especially, delays caused by interferences occur more frequently in case of using non-crossing cranes. This paper presents an efficient heuristics method for assigning moves of containers to each crane and for determining an appropriate container moving order in a manner sensitive to the interferences. Simulation experiments have shown that the proposed method can effectively reduce delays in various environments.

  • PDF

A Study On Optimized Design of Decision Support Systems for Container Terminal Operations (컨테이너 터미널 운영을 위한 의사결정시스템 설계의 최적화에 관한 연구)

  • Hong, Dong-Hee;Chung, Tae-Choong
    • The KIPS Transactions:PartA
    • /
    • v.10A no.5
    • /
    • pp.519-528
    • /
    • 2003
  • Container terminals need decisions in the course of daily-24 hour and 365 day - operations, and all these decisions are inter-related. The ultimate goal of Decision Support System is to minimize ship loading/unloading time, resources used to handle the workload, and congestion on the roads inside the terminal. It is also to make the best possible use of the storage space available. Therefore, the necessity of decision support tools are emphasized to enhance the operational efficiency of container shipping terminals more, because of limits and complexity of these decisions. So, in thia paper, we draw evaluation items for Decision Support Systems and suggest optimization strategy of evaluation items which have the greatest influence on Decision Support system, that is, yard stacking allocation, RTGC deployment among blocks, and YT allocation to QCs. We also estimate the efficiency of Decision Support System design by simulation using G2 language, comparing ship loading/unloading time.

The Development of Beamline Hutch Structures at PAL-XFEL (PAL-XFEL 빔라인 허치 구조물 개발)

  • Kim, Seungnam;Kim, Myeongjin;Kim, Seonghan;Kim, Yeongchan;Shin, Hocheol;Kim, Jihwa;Kim, Kyeongsuk;Kim, Kwangwoo;Eom, Intae
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.26 no.5
    • /
    • pp.567-577
    • /
    • 2016
  • The hutches which are installed in the beamline are largely classified into two, i.e XPP (X-ray pump probe) and CXI (Coherent X-ray image). Laser room is installed on the hutch and provides laser to XPP and CXI simultaneously. And two hutches have heavy crane to install some optics equipments. Safety and reliability of hutch structures should be taken into account for the precise operating of the laser facilities, so vibration analysis is essential to do this. The main purpose of vibration analysis is to install hutch structures with large stiffness. We have changed materials specification several times to install hutch structures having strong stiffness. Now hutch structures were installed and checked vibration status at laser room and XPP hutch. The results of laser table and robot arm satisfy vibration criteria. This paper explains about the design and vibration analysis of hutch structures.

Implementation of Ubiquitous Port Operation System Using RTLS (RTLS를 활용한 유비쿼터스 항만운영시스템 구축 방안)

  • Park, Doo-Jin;Choi, Young-Bok
    • The Journal of the Korea Contents Association
    • /
    • v.6 no.12
    • /
    • pp.128-135
    • /
    • 2006
  • RTLS(Real Time Location System) is the system to provide information and real-time location of tagged objects by using RTLS tag. In this paper, in order to enhance the performance of the port operation system, and efficient operation method of yard is suggested by applying RFID(Radio Frequency Identification)-based RTLS that provides real-time accurate positions of containers. In the group-based loading sequence system, the containers in the same group should have the similar characteristics such as POD(Port of Destination), size, weight, etc. In order to run this system, we propose the scheme using the parameters to the unspecified N bytes of RFID tag specified in ISO 18000-7. According to simulation result, the group-based system reduces the re-handling ratio of TC(Transfer Crane) in yard. It will reduce the whole lead-time in the process of port pogistics.

  • PDF

Analytical Study for Ultimate Behavior of Steel Cable-stayed Bridges under Construction Stage (시공중 강사장교의 극한거동에 대한 해석적 연구)

  • Lee, Joo-Tak;Kim, Seung-Jun;Kim, Jong-Min;Choi, Jun-Ho;Kang, Young-Jong
    • Journal of Korean Society of Steel Construction
    • /
    • v.23 no.6
    • /
    • pp.691-704
    • /
    • 2011
  • This paper presents an investigation on the ultimate behavior of steel cable-stayed bridges in the construction stage, considering various geometric nonlinearities and material nonlinearities. To numerically determine the state of cable-stayed bridges in the construction stage, initial shape analysis and construction stage analysis via backward process analysis were done sequentially. Then nonlinear analysis of the state under the construction load condition, considering the weight of the derrick crane and the key segment of the girder loaded onto the tip of the center span, was performed to investigate the ultimate behavior of the structure. The effects of the girder-mast stiffness ratio, the cable-arrangement types, and the area of the stay cables on the ultimate behavior were also extensively investigated. Moreover, the results of the ultimate analysis, considering both geometric nonlinearities and material nonlinearities, were compared with the results of the geometric nonlinear analysis, for a more meaningful investigation of the ultimate behavior of steel cable-stayed bridges in the construction stage.

Design and Implementation of Real Time Locating System for Efficient Vehicle Pooling in Port Terminal (항만 터미널 내 차량의 효율적 풀링을 위한 실시간 위치 측정 시스템 설계 및 구현)

  • Son, Sang-Hyun;Cho, Hyun-Tae;Beak, Yun-Ju
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.16 no.9
    • /
    • pp.2056-2063
    • /
    • 2012
  • In a port terminal, containers are stored and transshipped by yard tractors and crane vehicles. For operation efficiency of the terminal, location information of these vehicles is an essential factor. However, most of port terminals try to estimate location of these assets using indirect methods such as event tracking of shipping or unshipping containers. Because these kinds of events are rarely occurred, location of the event includes seriously locating error compared to a real location of vehicle. In this paper, we propose a real-time asset tracking system to obtain accurate and reliable location of terminal assets. The proposed system overcomes a location estimation error caused by container stacks which interrupt wireless communication. In order to mitigate uncertainty and increase accuracy of location estimation, we designed hardwares and multi-step locating system to resolve additional preblems. We implemented system components, and installed these at a port environment for evaluation. The result shows superiority of the system that the accuracy is approximately 5.87 meters (CEP).