In the summer of 2011, a simple, efficient, and low development cost Small Craft Motion Program (SCraMP) was released for iOS devices, with successive updates and enhancements in the time since. The purpose of this effort was to empower low budget operators with critical information pertaining to the state of their vessel. Capitalizing upon internal device hardware that would have cost thousands of dollars only a few years ago, the iOS application provides acceleration and rotation data, an index measure of severity of motions, statistics related to motions, and location information in a simple and interactive graphical user interface. This paper will discuss the use of smartphone applications like SCraMP as occupational safety intervention tools specific to maritime operations. Included in the paper will be an overview of SCraMP along with user feedback as to how such an app can inform operational decisions for safety. The author will also discuss a second maritime safety app recently developed and released in partnership with the Alaska Marine Safety and Education Association (AMSEA) entitled FVdrills which delivers previously published drill checklists (Jensen and Dzugan, 2009) into a smartphone app format. Therefore, the focus of the paper will be upon improving maritime safety via comparably low-cost, portable, smartphones to deliver data to operators and the ensuing user feedback.
A new vertical axis propulsion system with orbital paddles (called Bivortix system) is currently under review and in the experimental stage; this system is constituted by a pair of contra-rotating impellers, which provide directional thrust to 360°, allowing in each case a central thrust to axis, avoiding parasitic components. The system has been patented worldwide and so far n.2 working prototypes have been made, which have been tested in the towing tank of Trieste University and at the Vienna Model Basin. A boat, called Proteus, has been built and the first propeller prototype has been installed and tested at full scale; the results obtained showed very advanced capabilities concerning the maneuverability, the crash stop test and the good efficiency as regards the thrust. The results obtained as regards the efficiency were better than expected and the prototypes are currently being optimized. The system proves suitable to inland waterways, possessing a limited height of the blades outside the hull, the absence of rudders and the ability to perform maneuvers to 360°. Also the use in offshore activities can be suggested for its high efficiency and its maneuver capabilities. In the paper its functioning principles, the experimental processes carried out during the investigations and some significant results will be presented and discussed.
Ship structural design is done today resorting to powerful numerical tools. Ship structures come out to be optimal regarding load and failure mechanisms; in spite of this they come to lose that residual capability which in past gave a valuable benefit to overcome certain undesirable side effects. Such effects are not acceptable when ship’s structures are prone to develop high levels of vibrations excited by propulsion plant or other sources. In this frame, the paper investigates a river ship case, where preliminary calculations of structural dynamic response to vibrations induced by on board sources gain a relevant role in defining the minimum thickness of plates and supporting structures’ topology. River ship hulls have indeed light structures due to low demanding environments, which lead to an increase of vibration effects on accommodation decks. The approach here discussed is based on direct calculations of the hull’s structures dynamic response, performed in the frequency range where first harmonic frequencies of main excitation sources play a relevant role in inducing local and global vibration effects. The critical aspect of interaction between structure and fluid will be dealt with by an implicit modeling of the surrounding water around the hull. The aim of the study is to give the reader basic tools to implement, in the ship’s hull preliminary design stage, free and forced vibration analyses in order to support decision making about the hull scantling when vibration effects are not negligible.
Passenger vessels in the Amazon have given a great contribution to the movement of people and to the regional economy. However this type of transport is used by low-income persons and vessels are usually made of wood. However, the use of wood as a building material has proved to be increasingly scarce and expensive. A possible wood substitute is for example steel, but its use leads to increase price of hull construction as steel is more expensive and to increase weight of the hull, that in turn requires higher engine power and loss of loading capacity, which moreover directly contribute to increase cost of transport. This work, studies different materials for shipbuilding in the Amazon region, which seeks to assess different materials to use in building ships for the Amazon with a focus on passenger transport. This work studied different types of materials in order to identify the material that has better physical condition and cost for replacement of wood as a building material for passenger vessels. Five types of materials were studied: wood, steel, aluminium, fibreglass with Kevlar and fibreglass. Different materials were analysed using mathematical models for preliminary design with the objective to understand and compare the fixed and operational costs for the same vessel. Discussion supported by graphs gives indications to identify materials that have higher chances of success in replacing wood as building material for the river passenger ships in the Amazon region. The life cycle approach was used to evaluate the costs (fixed and operating) of a vessel built with different materials throughout its lifetime.
From ancient times, rivers play a very important role. They are utilized in various ways; drinking water, water distribution into agricultural area, catching river fish as food, transportation, hydroelectricity, etc. They are also important for culture and wildlife reservation. Some rivers such as Ganges in India are important from religious meaning, too. In China, due to the rapid development of economy the river transportation is almost at its maximum capacity. The river transportation near Shanghai is the busiest area in Yangtze River, China. There are many problems such as the development of huge container terminals, very shallow river mouth area and crossing ferries make it difficult. Mekong River passes China, Myanmar, Laos, Thailand, Cambodia and Vietnam. In its upper stream it passes very steep mountain area and in the lower stream it passes a quite flat area. There are rainy and dry seasons. In Chinese area several electricity purpose dams are constructed. International collaboration is quite important. In Indonesia, coal is a very important natural resource and rivers play a very important role for its transportation. In this paper these examples are explained from the author’s visiting experiences and the research, for the purpose to point out issues that should be considered to avoid making the same mistakes in the future development plans of many rivers such as the Amazon.