• Title/Summary/Keyword: Double trolley

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A Comparative Study on Productivity of Next Generation Quay Crane in Container Terminal (컨테이너 터미널의 차세대 안벽크레인 생산성 비교분석)

  • Ha Tae-Young;Choi Yong-Seok
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2004.11a
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    • pp.297-302
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    • 2004
  • This paper analyzed productivity of quay cranes on container terminal that have perpendicular yard layout block. In most existing container terminals, quay cranes of single trolley type are used to loading and unloading containers, but quay crane productivity of these type has many limitation about large size containership. For these reasons, recently quay cranes of various type that mn improve productivity are developed and as the representative example, dual trolley, double trolley, supertainer are developing. These cranes are realized that very high productivity bemuse their cycle time is short more than existent single trolley quay crane. Therefore, we analyzed productivity of these cranes that are realized by next generation crane alternatives and as result qf this research, mechaniml productivity by cycle time and net productivity by simulation were measured.

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A Comparative Study on Productivity of High Performance Quay Crane in Container Terminal (고성능 안벽크레인의 터미널 하역 생산성 비교분석)

  • Ha Tae-Young;Choi Yong-Seok
    • Journal of Navigation and Port Research
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    • v.29 no.6 s.102
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    • pp.547-553
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    • 2005
  • The purpose of this paper is to evaluate the quay crane productivity in automated container terminal with perpendicular yard layout. In particular, four quay crane (single trolley/dual trolley/double trolley/supertainer) are considered to evaluate the productivity on the terminal performance. Each quay crane load or unload containers by a different process. For each quay crane, two productivities are considered and compared: mechanical productivity, net productivity. As the net productivity of quay crane is significant, in this paper, an application of simulation model to simulate automated container terminal is developed and a wide variety of computational experiments were conducted.

Sway Control of c Container Crane (Part II): Regulation of the Pendulum Sway through Patternizing Trolley Moving Velocity (컨테이너 크레인의 흔들림 제어 (Part II): 트롤리 주행속도 조절을 통한 진자운동의 제어)

  • Hong, Keum-Shik;Sohn, Sung-Chull;Lee, Man-Hyung
    • Journal of Institute of Control, Robotics and Systems
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    • v.3 no.2
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    • pp.132-138
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    • 1997
  • Six different types of velocity profiles of trolley movement of a container crane are investigated for the minimal sway angle at the target trolley position. Three velocity patterns which include trapezoidal, stepped and notched-type velocity patterns are obtained assuming constant rope length. The notched type velocity pattern is shown to be derived from the time-optimal bang-bang control. The stepped type velocity pattern can be shown to be derived as bang-off bang control as well. Considering the damping effect due to hoist motion a double stage acceleration pattern is also analyzed. The main objective of the paper is to show how much time-reduction can be obtained among several velocity patterns appearing in the literature.

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A Study on the Firing Angle at the Mode Conversion to Improve the Output Characteristics of the Double Converter for Urban Railway DC Power Supply (도시철도 직류급전용 더블컨버터의 출력특성 향상을 위한 모드 변환 시 점호각 제어 연구)

  • Seo, Seung-Sam;Han, Sung-Woo;Byun, Gi-Sig
    • Journal of the Korean Society for Railway
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    • v.18 no.6
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    • pp.533-542
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    • 2015
  • This paper suggest away to maintain constant power through trolley wire by transferring increased line voltage to the AC main line while changing the mode from Converter(Forward) to Inverter(Reverse) when the line voltage is increased due to regenerative power when the train stops, This paper suggests a Double Converter DC substation that can create regenerative power when the train stops reusable. We also proposed using a simulation tool, the optimal Thyrister firing angle that can minimize the undershoot and overshoot that occurs when transferring the mode from Converter to Inverter for quality improvement of DC voltage in the Double Converter in the DC substation from the Busan Urban Subway.

Control Architecture for Automated Container Cranes (무인자동화를 위한 컨테이너크레인의 제어구조)

  • 김형진;홍경태;홍금식
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2004.10a
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    • pp.746-751
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    • 2004
  • Demands for higher productivity in container terminal environments continues to escalate consideration of equipment upgrades. And then transportation of containers using the automated container crane becomes more and more important for productivity enhancements. Introducing a hybrid control architecture to the container crane, it provides a effective means to the automated operation of the container crane. This paper addresses the methodology for automation of container cranes. In addition, this paper proposes a new control architecture for the automated container crane and explains each component of that architecture. The control architecture is composed of a deliberative control layer, a sequencing layer, and a reactive control layer. The proposed architecture is applied to a dual-hoist double-trolley container crane.

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Comparing Cycle Times of Advanced Quay Cranes in Container Terminals

  • Phan-Thi, Mai-Ha;Ryu, Kwangyeol;Kim, Kap Hwan
    • Industrial Engineering and Management Systems
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    • v.12 no.4
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    • pp.359-367
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    • 2013
  • The amount of international trade is rapidly increasing as a result of globalization. It is well known that as the size of a vessel becomes larger, the transportation cost per container decreases. That is, the economy-of-scale holds even in maritime container transportation. As a result, the sizes of containerships have been steadily increased for reducing transportation costs. In addition, various handling technologies and handling equipment have been introduced to increase the throughput capacities of container terminals. Quay crane (QC) that carries out load/unload operations plays the most important role among various handling equipment in terminals. Two typical examples of advanced QC concepts proposed so far are double trolley QC and supertainer QC. This paper suggests a method of estimating the expected value and the standard deviation of the container handling cycle time of the advanced QCs that involve several handling components which move at the same time. Numerical results obtained by the proposed estimation procedure are compared with those obtained by simulation studies. In order to demonstrate the advantage of advanced QCs, we compared their expected cycle times with those of a conventional QC.

A Study on a Catenary Impedance Estimation Technique using Boosting Current Compensation Based on Current Division Characteristics of an AT Feeding System

  • Jung, Hosung;Kim, Hyungchul;Chang, Sang-Hoon;Kim, Joorak;Min, Myung-Hwan;An, Tae-Pung;Kwon, Sung-Il
    • Journal of Electrical Engineering and Technology
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    • v.10 no.3
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    • pp.1370-1376
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    • 2015
  • Generally, an autotransformer(AT) feeding system consists of double tracks, up and down, with the trolley wire and feeder wire of the up and down tracks connected in the sectioning post(SP). Consequently, load current or fault current flows on two tracks based on catenary impedance characteristics, making it difficult to estimate catenary impedance accurately. This paper presents a technique for the estimation of catenary impedance using boosting current compensation based on the current division characteristics of an AT feeding system to improve the operation performance of impedance relay. To verify the technique, we model an AT feeding system through a power analysis program (PSCAD/EMTDC) and simulate various operation and fault conditions. Through the simulation, we confirmed that the proposed technique has estimated catenary impedance with a similar degree of accuracy to the actual catenary impedance