No description available.

No description available.

Thesis (Ph.D.)--University of Hawaii, Manoa, 2002. / Chair: Jerry Bentley. Includes bibliographical references.

The rapid economic growth of Taiwan has been paralleled by an increase in marine. traffic in the port of Keelung. The increase has been evolutionary and, prior to this study, has lacked the benefit of supporting research necessary to ensure no loss in navigational efficiency. The study uses eclectic methodologies to: identify the nature of marine traffic at Keelung; assess the associated risks; and identify measures needed to reduce risk and increase navigational efficiency. For contextual purposes the study reviews current marine traffic operations at Keelung against the background of geographical constraint and environmental conditions. Radar survey and extensive sampling of professional opinion indicate that existent traffic control measures are both inadequate and open to contravention. Casualty analysis further identifies areas of concern where navigation risk has been shown to exist In particular the traffic separation scheme, introduced in 1990; has been found inadequate and lack of movement control reduces navigational efficiency. Use of visual simulators, at Taiwan Ocean University and University of Plymouth, provided a unique opportunity to compare present marine traffic operations against a modified model. The modified model incorporated limited vessel traffic service functions and channel markers, neither of which exist at present in the live situation. Most significantly the experiment has enabled evaluation of the difference between Taiwanese and foreign ship masters when handling ships in the port approaches. Analysis of ship's tracks, and subjects' perceptions, concludes that provision of channel markers and sequence control greatly simplifies the operation and reduces risk. The need to widen the traffic lanes by reducing the separation zone between inward and outward lanes is identified. The study shows that navigational safety and efficiency at Keelung can be improved through the introduction of small changes to operation and working practices, The study provides the basis for a programme of continuing work necessary to maintain or further improve standards once the recommendations of the study have been implemented.

The project has been directed towards improving the accuracy and safety of marine navigation and ship handling, whilst contributing to reduced manning and improved fuel costs. Thus, the aim of the work was to investigate, design and develop an adaptable mathematical model that could be used in an integrated navigation system (INS) and an automatic collision avoidance system (ACAS) for use in marine vehicles. A general overview of automatic navigation is undertaken and consideration is given to the use of microprocessors on the bridge. Many of these systems now require the use of mathematical models to predict the vessels' manoeuvring characteristics: The different types and forms of models have been investigated and the derivation of their hydrodynamic coefficients is discussed in detail. The model required for an ACAS should be both accurate and adaptable, hence, extensive simulations were undertaken to evaluate the suitability of each model type. The modular model was found to have the most adaptable structure. All the modular components of this model were considered in detail to improve its adaptability, the number of non-linear terms in the hull module being reduced. A novel application, using the circulation theory to model the propeller forces and moments, allows the model to be more flexible compared to using traditional B-series four-quadrant propeller design charts. A new formula has been derived for predicting the sway and yaw components due to the propeller paddle wheel effect which gives a good degree of accuracy when comparing simulated and actual ship data, resulting in a mean positional error of less than 7%. As a consequence of this work, it is now possible for an ACAS to incorporate a ship mathematical model which produces realistic manoeuvring characteristics. Thus, the study will help to contribute to safety at sea.

Ulm, Univ., Diss., 2007.

Ulm, Univ., Diss., 2008.

Thesis (Ph. D.)--University of Wisconsin, 1926. Without thesis note. Thesis note stamped on cover. / Bibliography: p. 158-173.

Thesis (M.S. in Mechanical Engineering and Mechanical Engineer)--Naval Postgraduate School, March 1992. / Thesis Advisor: Healey, Anthony J. "March 1992." Includes bibliographical references (p. 157-159). Also available in print.

Inaug.-diss.--Rostock. / Lebenslauf. "Literatur": p. 5-6.