Dynamics of the container crane on a mobile harbor

Hong, Keum–Shik; Ngo, Quang Hieu

doi:10.1016/j.oceaneng.2012.06.013

Cited by 75 publications

(25 citation statements)

References 29 publications

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“…One possible option is to improve the efficiency and productivity in cargo handling demands (García-Morales et al, 2015;Ranga Rao and Sundaravadivelu, 1999;Yin et al, 2011). In addition, the container cranes have to become bigger and faster thanks to suitable controllers that can improve the transfer time as well as ensure the safety requirements (Hong and Ngo, 2012). Despite these improvements, many terminals are still faced with two problems: (i) the difficulty in accommodating the mega container ships due to the shallow water depth, and (ii) the port congestion due to the increase of cargo ships.…”

Section: Introductionmentioning

confidence: 99%

“…For offshore crane control, many researchers have focused on addressing challenges in offshore installations, such as underwater conveying systems for oil and gas field, see e.g., Skaare and Egeland (2006); Messineo and Serrani (2009); and Kuchler et al (2011). In this context, Hong and Ngo (2012) developed the first mathematical model of the container crane equipped/mounted on a ship with seaexcited motion, whereby a sliding mode control (SMC) strategy was introduced for mobile harbor cranes (Ngo and Hong, 2012b). Robustness of the control system is emphasized by using for offshore boom cranes a second-order sliding mode controller (Raja Ismail and Ha, 2012), and an optimal sliding mode controller (Raja Ismail et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Fuzzy sliding mode control of an offshore container crane

Ngo

Nguyen

et al. 2017

Ocean Engineering

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A fuzzy sliding mode control strategy for offshore container cranes is investigated in this study. The offshore operations of loading and unloading containers are performed between a mega container ship, called the mother ship, and a smaller ship, called the mobile harbor (MH), which is equipped with a container crane. The MH is used to transfer the containers, in the open sea, and deliver them to a conventional stevedoring port, thereby minimizing the port congestion and also eliminating the need of expanding outwards. The control objective during the loading and unloading process is to keep the payload in a desired tolerance in harsh conditions of the MH motion. The proposed control strategy combines a fuzzy sliding mode control law and a prediction algorithm based on Kalman filtering for the MH roll angle. Here, the sliding surface is designed to incorporate the desired trolley trajectory while suppressing the sway motion of the payload. To improve the control performance, the discontinuous gain of the sliding control is adjusted with fuzzy logic tuning schemes with respect to the sliding function and its rate of change. Chattering is further reduced by a saturation function. Simulation and experimental results are provided to verify the effectiveness of the proposed control system for offshore container cranes.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fuzzy sliding mode control of an offshore container crane

Ngo

Nguyen

et al. 2017

Ocean Engineering

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“…To resolve the problems, various studies have been conducted. In [7], a dynamic model of a mobile harbor subject to the motions of ship itself imparted by random sea waves was developed. It considered both sea-wave-induced ship motion and ship-motion-induced container sway.…”

Section: Introductionmentioning

confidence: 99%

Simulation Models for Offshore Port Service Concepts

Kim

Kim²

2019

Applied Sciences

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Offshore port service concepts were developed to flexibly respond to the emergence of large container ships and the increase in port trade volume. As one such offshore service concept, a mobile harbor system has recently been proposed. Although it is possible to effectively increase the capacity of existing ports through these mobile harbor systems, the methodology for evaluating the performance of a traditional port is limited when applied to evaluating the performance of the mobile harbor system. In this study, we develop a simulation model to analyze the mobile harbor system. The simulation model reflects the operating characteristics of the mobile harbor, and the performance metric of the system can be derived from the model. The results can be applied to capacity planning of a port system with a method that reduces search space. We applied our method to the Surabaya port in Indonesia to derive the optimal mobile harbor design that satisfies the required service level.

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“…Chin et al [6] demonstrated the effects of a platform motion on the dynamic stability of the boom crane. Keum-Shik Hong et al [7] investigated the influences of transverse and travel motions of a three-dimensional overhead crane system on the payload pendulum. Recently, David Blackburn et al [8] studied the dynamics of a slewing-crane.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Simulation of the Harvester Boom Cylinder

2017

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Based on the complete dynamic calculation method, the layout, force, and strength of harvester boom cylinders were designed and calculated. Closed simulations for the determination of the dynamic responses of the harvester boom during luffing motion considering the cylinder drive system and luffing angle position control have been realized. Using the ADAMS mechanical system dynamics analysis software, six different arm poses were selected and simulated based on the cylinder as the analysis object. A flexible model of the harvester boom luffing motion has been established. The movement of the oil cylinder under different conditions were analyzed, and the main operation dimensions of the harvester boom and the force condition of the oil cylinder were obtained. The calculation results show that the dynamic responses of the boom are more sensitive to the luffing acceleration, in comparison with the luffing velocity. It is seen that this method is very effective and convenient for boom luffing simulation. It is also reasonable to see that the extension of the distance of the bottom of the boom is shortened by adjusting the initial state of the boom in the working process, which can also effectively reduce the workload of the boom-thus improving the mechanical efficiency.

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Dynamics of the container crane on a mobile harbor

Cited by 75 publications

References 29 publications

Fuzzy sliding mode control of an offshore container crane

Fuzzy sliding mode control of an offshore container crane

Simulation Models for Offshore Port Service Concepts

Dynamic Simulation of the Harvester Boom Cylinder

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