• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.1
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• pp.719-727
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• 2021

In the field of architecture, retractable devices capable of responding flexibly to the environment have been applied widely to large structures. Among these devices, the aesthetically pleasing retractable membrane is lightweight so that the membrane can be opened easily using only a traction device. On the other hand, because the towed membrane moves as it is connected to the main cable by a trolley, the number of trolleys needed increases in proportion to the roof's area. This study proposes an optimal model for an open-type trolley (OTT), which is used widely in these devices, using topology optimization. The analysis used the ANSYS program. A new model was proposed based on the results and reviewed through the feedback. Through this process, it was possible to develop a prototype with increased durability and reduced weight. For OTT, optimization was performed based on static analysis and the boundary conditions, so three prototypes were designed. A comparison of the proposed trolley with the conventional one under the same conditions revealed an up to 71.04% decrease in volume while the yield-strength reached 8.67 to 11.43%. In conclusion, the optimal trolley proposed was found to be reliable in terms of economy and stability.

• 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.

• Proceedings of the KIEE Conference
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• 2000.07d
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• pp.2339-2341
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• 2000

본 논문은 제어대상인 현수형 케이블의 수학적 모델을 작성하고 이것에 장력을 발생하는 교류서보 전동기의 수학적 모델을 구하였다. 제어 방법은 제어대상의 동적 모델이 비선형 시변계이기 때문에 강인성이 있는 퍼지제어를 적용하고 차대가 움직이기 시작할 때 발생하는 오버슈트을 억제하기 위해서 피드포워드제어를 채택한다. 케이블의 동적 모델에 기초하여 퍼지제어기와 피드포워드제어를 도입하여 시스템을 구성하고 시뮬레이션 실험에 의해 그 유효성을 평가하였다. 현재 로프제조 공정, 전차 트롤리선 가설공사는 장력의 제어가 필요하지만 거의 수동으로 행하고 있는 실정이고 제품의 균질성과 생산성 향상을 위하여 제조 공정의 자동화가 필요하다. 따라서 전차의 트롤리선 가설공사는 케이블을 탑재한 차대가 주행하면서 드럼에 감긴 케이블을 풀어주고 양단의 장력을 일정히 유지하도록 조절할 필요가 있다. 그러나 전기공사에서 시행하고 있는 송 배전 선로의 전력케이블 가선공사나 전차 트롤리선 가설공사는 수동으로 하고 있는 실정이고 이것의 자동화기계가 필요하다. 따라서 본 연구의 목적은 현수형 가선 케이블 가설장치의 자동화이다. 본 연구에서는 제어대상인 현수형 케이블의 수학적 모델을 작성하고 이것에 장력을 발생하는 교류서보 전동기의 수학적 모델을 구하였다. 제어 방법은 제어대상의 동적 모델이 비선형 시변계이기 때문에 강인성이 있는 퍼지제어를 적용하고 차대가 움직이기 시작할 때 발생하는 오버슈트를 억제하기 위해서 피드포워드제어를 채택한다. 케이블의 동적 모델에 기초하여 퍼지제어기와 피드포워드제어를 도입하여 시스템을 구성하고 시뮬레이션 실험에 의해 그 유효성을 평가하였다.

• Proceedings of the Korea Institute of Convergence Signal Processing
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• 2000.08a
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• pp.141-144
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• 2000

현재 로프제조 공정, 전차 트롤리선 가설공사는 장력의 제어가 필요하지만 거의 수동으로 행하고 있는 실정이고 제품의 균질성과 생산성 향상을 위하여 제조 공정의 자동화가 필요하다. 따라서 전차의 트롤리선 가설공사는 드럼에 감긴 케이블을 풀어주고 양단의 장력을 일정히 유지하도록 조절할 필요가 있다. 따라서 본 연구의 목적은 현수형 가선 케이블 가설장치의 자동화이다. 본 논문은 제어대상인 현수형 케이블의 수학적 모델을 작성하고 이것에 장력을 발생하는 교류서보 전동기의 수학적 모델을 구하였다. 제어 방법은 제어대상의 동적 모델이 비선형인 동시에 시변계이기 때문에 강인성이 있는 퍼지제어를 적용하여 시스템을 구성하고 시뮬레이션 실험에 의해 그 유효성을 평가하였다.

• Proceedings of the KIEE Conference
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• 2000.07d
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• pp.2452-2454
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• 2000

현재, 전차선의 트롤리선을 설치하는 것은 수작업에 의해 행해지고 있어 작업의 효율화와 함께 최적의 장력제어가 필요하다. 케이블을 새롭게 가설하는 장치는 케이블을 릴에 감아 올릴 필요성은 거의 없기 때문에 케이블을 풀어주는 속도와 로드셀에 의해 장력을 검출하고 장력을 발생하는 하드웨어 구성방법을 연구하는 것이다 본 연구는 현수형 케이블(Catenary Cable)의 동적 모델링을 작성한다. 이 시스템에 대하여 교류서보 전동기를 이용한 장력 발생장치를 모델링한다. 현수형 시스템의 장력계측 장치는 하중변환기(load cell)를 사용하고 수학적 모델링을 행한다. 장력계측 장치에 관해서 스프링 저울을 이용해 출력을 비교 검토한 결과, 인장력을 계측하는 장치로서의 유효성을 확인하였다.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.34 no.2
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• pp.227-235
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• 2010

This paper introduces the design of a bridge transport system with a telescopic tube for positioning equipment to perform remote handling tasks in a radioactive facility. It consists of an extensible and retractable telescopic tube assembly for z-direction motion, a cabling system for management of power and signal cables, and a trolley system for transverse motion and accommodating servo drives. The working environment for the bridge transport system with the telescopic tube requires strict geometrical constraints, including a short height, short telescopic tube length when retracted, and a long stroke. These constraints were met by solving a nonlinear programming problem involving the optimal dimensions. This paper introduces a cabling system for effective management of cables with changeable lengths to accommodate telescopic motions and a selection guide for servo drives that are sufficient to drive the system.

• Journal of Power System Engineering
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• v.7 no.1
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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.

• The Transactions of the Korean Institute of Power Electronics
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• v.15 no.1
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• pp.9-16
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• 2010

This paper presents supervisor control methods at a matrix converter controlled overhead crane system based on a controller area network (CAN). Four induction motors are used to drive the gantry, trolley, and hoist at he crane and each motor is controlled by the matrix converter with direct torque control (DTC). Both the position control algorithm and the supervisor control system using CAN are introduced. Simulation and experimental results are carried out to verify the performance of position control at the matrix converter controlled crane system.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2013.10a
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• pp.424-429
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• 2013

The trolley carrying the pod moves along by the airfield runway. The pod through the trolley are subjected to vibration arising from the ground state, the precision optical components in the pod can have a significant impact. The road tests were conducted by using the measurement pod to remove the risk for the project. The measurement pod was composed with the ACRA, sensors, battery. The accelerometers were attached to get the acceleration through the road condition. The PSD envelop was calculated by FFT from the acceleration. The driving safety was proven through comparing the measurement data and MIL-STD-810G specification.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.11
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• pp.7941-7948
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• 2015

Rolling noises during train operation are caused by vibration excited from irregularities of surface roughness between wheel and rail. Therefore, a proper measurement and analysis techniques of acoustic roughness between wheel and rail surface are required for transmission, prediction, and analysis of the train rolling noise. However, since current measuring devices and methods use trolley-based manual handling devices, the measurements induce unstable measuring speed and vibrational interface that increases errors and disturbances. In this paper, a new automatic rail surface exploring platform with a speed controller has been developed for improving measurement accuracy and reducing inconsistency of measurements. In addition, we propose a data integration method of the rail surface roughness with multiple homogeneous displacement sensors and verified the accuracy of the integrated data through standard test-bed railway track investigation.