There are many advantages of using Computer Aided Design (CAD) Systems in a shipbuilding environment: ease of design, speed of construction, use and reuse of information, etc. It is expected that in future CAD tools will advance further and allow greater information management and virtual access through smart devices. The authors of this paper talk about a new concept in shipbuilding, the Internet-of-Ships (IoS) which would have a deep impact on the ship design and production, with a huge diversity of present and potential applications. KeywordsInternet of Ships, Ship Design, Shipbuilding CAD Systems Introduction to the Future of the Shipbuilding CAD SystemsThere are several fields where CAD systems could be improved in near future. However, here the focus is on functionalities that are being improved right now. E.g. in hull forms fairing, the global shape modelling or the advance continuity and capping could transform complex surfaces with excellent results, less interaction, high accuracy, and full control. These techniques shorten dramatically the design time, from days to minutes while obtaining excellent results [1]. Another area of improvement concerns one of the most time-consuming tasks in outfitting design, the routing of pipes, HVAC ducts and cable trays. Automatic routing options minimize this time, but without redusing the robustness of the design.Automatic routing provides simple solutions, with optimization of material, and several algorithms exist. But the matter is not only to consider existing elements for future routings; it is also necessary to assign priorities, and eventually handle automatic modifications of existing elements as a consequence of new ones. The complexity of the How to cite this paper: Liu

SummaryThe aim of this article is to design, precisely and fully detailed, the Control Room of a Ballast Actuation System of a marine Tidal Energy Converter. The design would respond to the detail design stage of any shipyard for its subsequent manufacture.During the following lines, the authors have analysed the Ballast Actuation System, not only from a conceptual way, but also from the detailed design point of view, so it has been considered necessary to complete it, with a study of a technological nature, in which industrial (reducing the cost and increasing reliability) solutions have been developed for measuring and driving systems.To elaborate the 3D detail design of the pump room, a topological design has been introduced for allowing a quicker evaluation of different design alternatives. All the machinery, piping, supports and auxiliary structures have been modelled in order to evaluate the quality of the conceptual and initial design. The primary structure, as well as the location of the equipment, have been carefully studied and analysed.The P&ID (Piping and Instrumentation Diagrams) and access drawings have been followed in order to model the 3D pipe routing, supports and auxiliary structure. The 3D components have been defined from its main features (element ID, supplier, description, weight and centre of gravity) and its geometry (library or geometric macro model), provided by the supplier. All this work has been carried out with the intention of not only assess different alternatives, but also to generate at any time the information for manufacturing and mounting.

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This paper analyses in the study of the factors that most affect multihull vessels, and thus determine the feasibility of a new class of ships. It focuses on the impact of service requirements (vessels are typically designed and built under national standards that take into account different factors such as strength, stability, buoyancy, etc.) in a way they are able to withstand extreme environmental conditions with minimal damage, essential for correct and responsible operation. In this paper it is compared, in terms of seakeeping prediction, the results of a monohull with a multihull. In recent years there has been a major breakthrough in this area and it should be noted that although a priori, it may seem that such structures have very good seakeeping characteristics and they provide superior operation compared to traditional monohull with equivalent displacement. They also have some disadvantages such as a higher drag because the wetted surface is higher than its equivalent monohull, and a large weight variation due to their low flotation area. Seakeeping optimization and improving on board comfort aspects are both aspects related to the development of reliable numerical tools as well as knowing a good statistical climatological description. It is crucial to conduct preliminary tests using scale models in a canal with the latest technology for wave generation, test instruments and devices for measuring the movements of the ship and the application of operational criteria. This ensures smaller amplitude movements, high coefficient of floating, sterns mirror, less draft, more beam and metacentric height provide the appropriate natural period.