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Open Access. Powered by Scholars. Published by Universities.®

2010

National Taiwan Ocean University

Transportation Engineering

Articles 1 - 8 of 8

Full-Text Articles in Engineering

Corrosion Behaviour Of Brass In The Vembanad Estuary, India, Andy Mathiazhagan, Rani Joseph, Kanjiramparayil Puthilon Narayanan, Palaniandy Seralathan Oct 2010

Corrosion Behaviour Of Brass In The Vembanad Estuary, India, Andy Mathiazhagan, Rani Joseph, Kanjiramparayil Puthilon Narayanan, Palaniandy Seralathan

Journal of Marine Science and Technology

Corrosion characteristics of brass panels were investigated in the Vembanad estuarine water (Cochin Harbor), India over a period of one year. The corrosion rate of brass samples during exposure was determined by gravimetric method and fouling on panels was assessed, exposure-wise, in terms of biomass. Corrosion products were identified by X-Ray diffraction. The results of the study were discussed in the light of the seawater characteristics.

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A Wide Speed Range Sensorless Control Technique Of Brushless Dc Motors For Electric Propulsors, Min-Fu Hsieh, Hung-Ju Liao Oct 2010

A Wide Speed Range Sensorless Control Technique Of Brushless Dc Motors For Electric Propulsors, Min-Fu Hsieh, Hung-Ju Liao

Journal of Marine Science and Technology

This paper presents a sensorless drive technique for permanent-magnet brushless DC motors applied to electric propulsors of small ships or underwater vehicles. Propulsors enveloping electric motors (e.g., POD or subsea thrusters) have been increasingly applied due to their advantages of excellent maneuverability, high efficiency and low maintenance costs. To secure reliable operation under water, sensorless control is considered as an appropriate technique. However, conventional sensorless techniques often suffer problems of narrow speed range and low efficiency, particularly when the propulsors sustain heavy load at high speed operation. Hence, a sensorless technique with a wide speed range is developed in this …

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The Study Of Ship Collision Avoidance Route Planning By Ant Colony Algorithm, Ming-Cheng Tsou, Chao-Kuang Hsueh Oct 2010

The Study Of Ship Collision Avoidance Route Planning By Ant Colony Algorithm, Ming-Cheng Tsou, Chao-Kuang Hsueh

Journal of Marine Science and Technology

Maritime traffic is becoming more complex every day. At present, due to technological advances and to new maritime regulations, there is increasing demand for new nautical marine instruments to be installed into the bridge, and the breadth of navigational information complicates on-duty officers’ decisions. Therefore, if decision support tools can be used to help deal with navigational decision-making, human errors arising from subjective judgments can be reduced, and sea transport safety improved. This research uses the concept of e-navigation as a framework, positioning collision avoidance path planning as the main theme, and applies an Ant Colony Algorithm (ACA) in the …

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Risk Evaluation Of Ship Dynamic Stability In Regular Waves, Zhan-Jun Long, Seung-Keon Lee, Han-Suk Choi Aug 2010

Risk Evaluation Of Ship Dynamic Stability In Regular Waves, Zhan-Jun Long, Seung-Keon Lee, Han-Suk Choi

Journal of Marine Science and Technology

In this paper, a method combined with the existing approaches is proposed for evaluating and predicting the safety of ship rolling in regular waves. Based on the uncoupled equation of a single degree of freedom, the nonlinear ship rolling in waves is presented and the differential equation is integrated in the time domain by the fourth order Runge-Kutta algorithm. The erosion of the safe basins of a ship roll equation is simulated and the survival probability of a typical ship is studied according to the statistical and simulation results. The numerical results show that the survival probabilities of ship excited …

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Siphoning Sea Water Back Into The Engine In Fast Boats, Osman Azmi Ozsoysal Aug 2010

Siphoning Sea Water Back Into The Engine In Fast Boats, Osman Azmi Ozsoysal

Journal of Marine Science and Technology

A failure investigation has been conducted on the exhaust system of a high speed marine diesel engine in Turkish ambulance boats. Premature failures were reported on the poor starting, on the loss of power, on the lubricating oil leakage and on the engine overload. It was observed some significant tracks of sea water found its way into the exhaust passages from condensation of the salt water vapour and also from entering some sea water into the exhaust system. In order to initiate a more accurate cause investigation, the engine went through an overhaul inspection, in which it was determined that …

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A Risk Analysis Of Stevedoring Operations In Seaport Container Terminals, Kuo-Chung Shang, Wen-Jui Tseng Apr 2010

A Risk Analysis Of Stevedoring Operations In Seaport Container Terminals, Kuo-Chung Shang, Wen-Jui Tseng

Journal of Marine Science and Technology

This research is a study of container terminals in Kaohsiung Harbor and investigates risk management in the loading and unloading of container terminals. The study shows that the top three factors associated with severity of accident risk are: “Moving the crane without raising the lifting arm of the gantry crane, resulting in damage to the pilot’s compartment,” “Transferring containers direct to the trailers,” and, “As a result of climatic factors (typhoons), the facility takes no action to prevent collisions.” The top three factors associated with frequency of accident risk are, “Ships go by and waves cause a declined-body, raised prow …

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Ahp Model For The Container Port Choice In The Multiple-Ports Region, Chien-Chang Chou Apr 2010

Ahp Model For The Container Port Choice In The Multiple-Ports Region, Chien-Chang Chou

Journal of Marine Science and Technology

In this paper, a theoretical analysis of the effect of surface roughness on the lubrication characteristics of inclined stepped composite bearings with micropolar fluid is examined. A generalized form of surface roughness is mathematically modeled by a stochastic random variable with non-zero mean, variance and skewness. The generalized average Reynolds type equation is derived for the rough inclined stepped composite bearings with micropolar fluid. The closed form expressions are obtained for the fluid film pressure, load carrying capacity, frictional force. These expressions can be utilized to obtain the performance characteristics of four different types of bearing system viz; rough plane …

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Melnikov Analysis Of A Ship's Stability With Water-On-Deck, Ying-Guang Wang Feb 2010

Melnikov Analysis Of A Ship's Stability With Water-On-Deck, Ying-Guang Wang

Journal of Marine Science and Technology

The nonlinear ship rolling motion with water-on-deck in regular beam waves is studied by utilizing a global geometric method. A ship stability criterion based upon the Melnikov function is obtained to provide an upper bound on the domain of the potential chaotic rolling motion. Phase plane diagrams and Poincare maps are used to validate the ship stability criterion obtained in this article.

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