• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 춘계학술대회 및 창립 30주년 심포지엄(논문집)
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• pp.363-366
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• 2006

항만에 있어서 하역장비는 매우 중요하다. 컨테이너 크레인이나 트랜스퍼 크레인 같은 장비가 고장이 나면 수리나 재주문에 걸리는 시간동안 작업이 이루어지지 못하므로 엄청난 비용손실을 초래한다. 그러나 가격이 고가이므로 예비품을 많이 보유할 수도 없는 형편이다. 대체적으로 부피가 크고 고가인 항만 장비의 특성상 효율적인 예방정비와 고장 분석을 통해 장비의 신뢰성을 확보하는 것이 무엇보다 필요하다. 본 연구는 항만 장비 중 주요 장비인 트랜스퍼 크레인을 선정하여 시스템 및 기능, 고장 메카니즘을 분석하였으며, 고장/정비 이력 데이터의 수집 및 정리를 통하여 고장과 정비 작업의 내용을 표준화하였다. 장비의 운영 및 정비 작업을 전산화하기 위한 기초 작업인 본 연구는 다음 세대 장비의 최적 설계와 장비의 최적 운영 정책을 설계하는 새로운 시도가 될 것이다.

• 한국항해항만학회지
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• 제29권6호
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• pp.547-553
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• 2005

본 연구에서는 수직배치형 장치장 블록형태의 자동화 컨테이너 터미널을 대상으로 안벽에서 컨테이너의 양${\cdot}$적하 작업을 수행하는 안벽크레인(Q/C)에 대한 하역생산성을 평가해 보았다. 분석 대상이 되는 안벽크레인의 유형으로 기존의 싱글트롤리 타입외에 차세대 안벽크레인으로 인식되고 있는 듀얼트롤리 더블트롤리, 수직순환식의 하역방식을 가지는 네 가지 장비이다. 이들은 각기 다른 방식으로 선박의 컨테이너를 하역하며, 이들 각각에 대해 기계적 생산성과 순작업 생산성을 산출해 보았다. 특히, 안벽크레인의 순작업 생산성을 산출하기 위해 각 장비에 대한 시뮬레이션 모델을 수립하고 이를 적용한 시뮬레이션 시스템을 개발하였으며, 개발된 시뮬레이션 시스템을 통해 내 가지 안벽크레인에 대한 다양한 시뮬레이션이 수행되었다.

• 한국항만학회지
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• 제10권2호
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• pp.43-50
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• 1996

The purpose of this paper is to develop the cycle time simulation system for the various types of container cranes - container cranes, RMGC, RTGC, OHBC. First, the paper describes the derivation of the cycle time formula for crane simulation and the development of the simulation logic. And, the paper includes details on the design and implementation of the computer simulation system.

• 산업경영시스템학회지
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• 제41권4호
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• pp.238-247
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• 2018

This paper considers the problem of scheduling loading and unloading operations of a crane in a railway terminal motivated from rail-road container transshipment operations at Uiwang Inland Container Depot (ICD). Unlike previous studies only considering the total handling time of containers, this paper considers a bi-criteria objective of minimizing the weighted sum of the total handling time and tenant service time. The tenant service time is an important criterion in terms of terminal tenants who are private logistics companies in charge of moving containers from/to the terminal using their trucks. In the rail-road container shipment yard, the tenant service time of a tenant can be defined by a time difference between beginning and finishing loading and unloading operations of a crane. Thus, finding a set of sequences and time of the crane operations becomes a crucial decision issue in the problem. The problem is formulated as a nonlinear program which is improved by linearizing a nonlinear constraint in the model. This paper develops a genetic algorithm to solve the problem and performs a case study on the Uiwang ICD terminal. Computational experiment results show that the genetic algorithm shows better performance than commercial optimization solvers. Operational implications in terms of tenants are drawn through sensitivity analyses.

• 한국소음진동공학회논문집
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• 제20권8호
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• pp.753-760
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• 2010

In this paper, the lifting analysis of a floating crane with a shipbuilding block is performed. Since floating cranes are operated in ocean waves, six degree-of-freedom motions are considered in the dynamic equations of motions of the floating crane and the block. The boom of the floating crane is considered as an elastic body in the analysis, and is modeled as three dimensional beam based on the finite element formulation. The hydrostatic and hydrodynamic forces by a regular wave are considered as external forces. By solving the equations of motions numerically, the dynamic responses of the floating crane and the block are simulated. The simulation results with different wave directions are compared and the conditions which cause maximum responses are discussed.

• 한국생산제조학회지
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• 제7권6호
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• pp.28-35
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• 1998

Computer simulation technique has been applied on the various engineering fields to reduce cost and development period. On this paper, we introduce a crane analysis program. Using this program, we can predict reaction force of each part or supporting force of truck crane on a personal computer system with out exclusive knowledge of multi-body dynamics. In order to consider the effect of boom flexibility according to each working condition, flexible dynamic theory is applied to the program. Actual crane model is analyzed on special work condition using this program and the results are compared with those of rigid boom model.

• 동력기계공학회지
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• 제7권1호
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• pp.51-59
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• 2003

The recent amount of container freight continuously has been increased, but the low efficiency of container crane causes jamming frequently in transportation and cargo handling at port. It is required that the working velocity and safety are improved by control of moving the trolley as quick as possible without large overshoot and any residual swing motion of container at the destination. In this paper, a LQ Fuzzy controller for a container crane is proposed to accomplish an optimal design of improved control system for minimizing the swing motion at destination. In this scheme a mathematical model for the system is obtained in state space form. Finally, the effectiveness of the proposed controller is verified through computer simulation.

• 한국정밀공학회지
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• 제17권4호
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• pp.181-188
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• 2000

Input shaping is a method fur reducing residual vibration. Vibration is eliminated by convolving an input shaper, which is a sequence of impulses, with the desired system command. It has been applied to robot with a flexible manipulator. But it can be applied to the reduction of residual vibration far overhead crane. In this paper, input shaping shows good performance for anti-sway of overhead crane. In the z-domain, we designed an input shaper and calculated the sensitivity of it. If sensitivity is calculated in the z-domain, the shapes of sensitivity curves are expected easily. Accordingly, it is easy to design an input shaper in the z-domain. We compared the response of a system with shaper to it without that. Also, we compared El shaper to ZV shaper in view of robustness.

• 한국정밀공학회지
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• 제21권2호
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• pp.160-167
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• 2004

The correlation between the object function and the design parameter is shown on this paper by using the characteristic function for the mixed result of the structural analysis, the buckling analysis and the table of orthogonal array according to the original overhead crane's dimensional change. About the above two functions, the effectiveness of design change according to the change of design parameters could be estimated. Also, the overhead crane's weight is reduced up to 10.55 percent maintaining the structural stability according to the thickness of plate.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2000년도 추계학술대회논문집
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• pp.159-167
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• 2000

During the operation of crane system in the container yard, it is necessary to control the crane trolley position so that the swing of the hanging container is minimized. Recently an automatic control system with high speed and rapid transportation is required. Therefore, we designed a controller to control the crane system with disturbances and weight change. In this paper, we present the neural network two degree of freedom PID controller to control the swing motion and trolley position. Then we executed the computer simulation to verify the performance of the proposed controller and compared the performance of the neural network PID controller with our proposed controller in terms of the rope swing and the precision of position control. Computer simulation results show that the proposed controller has better performances than neural network PID with disturbances.