Currently, maritime transportation constitutes the biggest part of world trade. For this reason, ships have a great importance and are effectively used throughout world. Shipbuilding ship repair industries frequently utilize engineering processes such as design, manufacture, repair, research development, quality control etc. In all mentioned processes, digital data CAD drawings regularly by eng...

Parametric surfaces in various representations, such as Bézier-and B-spline-tensorproduct patches, triangular patches etc., play an important role in CAGD-applications. Connecting patches with different degree of continuity and trimming surfaces are well-known techniques to construct a variety of shapes like ship hulls, car bodies, etc. For finite element analysis, stereolithography, rendering ...

Hydrodynamic performance of a marine vessel mainly depends on the frictional and pressure resistance. Pressure drag reduction could be achieved by improving the shape of the vessels with implementation of modern hull forms. Hull forms optimization techniques could also be used for this purpose. Other techniques are needed to deal with the viscous portion of the total resistance, which is mainly...

The powering issue of a high-speed marine vehicle with multihulls and air-cushion support is addressed, since there is an often need to quickly evaluate the effects of several configuration parameters in the early stage of the design. For component hulls with given geometry, the parameters considered include the relative locations of individual hulls and the relative volumetric ratios. Within t...

commitment, beginning with the CNO and including every sailor in the fleet. That is why a larger Navy must be in the budget from the start, particularly this year. The Navy cannot rely on Congress to add money above the top line to make up for its own budget shortcomings. For years, we in Congress added money to the administration’s defense budget. I do not believe that we will so readily revis...

Isogeometric Analysis uses NURBS representations of the domain for performing numerical simulations. The first part of this paper presents a variational framework for generating NURBS parameterizations of swept volumes. The class of these volumes covers a number of interesting free-form shapes, such as blades of turbines and propellers, ship hulls or wings of airplanes. The second part of the p...

Abstract This paper described the process of generating optimal parametric hull shape with a fully modeling method for three containerships different sizes. The newly created ship was applied to another similar shape, which greatly saved time cost. A selecting design variables developed, and during this process, influence these on calm water resistance analyzed. After we obtained hulls, wave ad...

Ultrasonic guided waves are widely used to inspect and monitor the structural integrity of plates and plate-like structures, such as ship hulls and large storage-tank floors. Recently, ultrasonic guided waves have also been used to remove ice and fouling from ship hulls, wind-turbine blades and aeroplane wings. In these applications, the strength of the sound source must be high for scanning a ...