Ship motions Ship motions are defined by the movements from the equilibrium position of the ship's centre of gravity along the three axes shown in Figure and by rotations about axes approximately parallel to these. The linear displacements along the horizontal

Break-bulk cargo ships The inboard space in break bulk cargo ships is divided longitudinally by transverse bulkheads spaced 40-70 ft apart, into a series of cargo compartments of approximately equal volume

The design of a ship involves a selection of the features of form, size, proportions, and other factors which are open to choice, in combination with those features which are imposed by circumstances beyond the control of the design naval architect. Each new ship should do some

Those who have attained some familiarity with computer operation and application have subsequently learned hat they must continually keep abreast of developments or rapidly fall behind, not only in regard to programming skills but most naval architects have properly decided

Template Structures By far the most common type of fixed offshore structure in existence today is the template, or substructure that extends from the seafloor to above the water surface and a prefabricated steel deck located atop the substructure. The deck is supported by pipe piles driven through the legs of the substructure into the seafloor. These piles not

A naval architect asked to design a ship may receive his instructions in a form ranging from such simple requ ents as \an oil tanker to carry 100 000 tons deadweight at 15 knot nots\to a fully detailed specification of precisely planned requirements. He is usually required to prepare design for a vessel that must carry certain

Marine engine is an engine that propels a water-born vessel. Even in small craft the marine engine must have the following characteristics: reliability, light weight, compactness fuel economy, low maintenance, long life, relative simplicity for operating personnel, ability to reverse, and ability to operate steadily at low or cruising speed. The relative importance of these

Planning Delivery of a completed ship by a specified date requires careful planning. Following the introduction of the critical path method of planning and control by the U. S. E. I. du Pont de Nemours Company' about 1959, new techniques were adopted in many shipyards

Components The strength deck, bottom, and side shell of a ship act as a box girder in resisting bending and other loads imposed on the structure. The main deck, bottom, and side shell also form a tight envelope to withstand the sea locally. The remaining structure contributes either directly to these

斑岩铜矿( Porphyry copper deposits)为世界提供了50%以上的 铜金属( over 100 producing mines)。 Their close relatives the porphyry moly deposits produce 70%o of the world's moly. Both deposit types will be discussed separately, but they share many characteristics and are formed in somewhat similar manners