The application of information technology plays an important role in improving the efficiency and productivity in the shipbuilding industry. The International Conference on Computer Applications in Shipbuilding (ICCAS) provides an important forum for industry, IT vendors and research organisations to meet and discuss latest developments and exchange ideas and experience.

Says CS Lee, DNV Software’s Regional Manager for Korea and Japan: “The Korean shipbuilding industry recognises the importance of employing advanced information and communication technology (ICT) in its design and production processes to move to the next stage of advanced shipbuilding. DNV Software has benefited immensely from attending ICCAS, learning more about the environment of rapid development of computer applications and the introduction of the next generation of CAD software. We also learned about the desire for improved knowledge management which will enhance productivity and maintain Korea’s position as world leaders in shipbuilding.”

From left: Samsung’s G.W. Sakong, Manager CAD Development, and Dr Y.S. Bae, Vice President, and DNV Software’s CS Lee, Regional Manager Korea and Japan, and Elling Rishoff, Managing Director.

The ICCAS conference program included two papers from DNV Software.

Initial Ship Design supported by 3D Intelligent Graphics and e-approval
Authors: Torben Andersen, Odense Steel Shipyard and
Jørgen Piene, DNV Software
When building a new ship, the most critical period of time relative to performance, quality, life-cycle costs and building costs is the initial design period. This is true for the owner, the builder, the operators and the responsible authorities. In the maritime industry, classification societies play a unique role as independent professionals supporting creation and protection of lasting values.

Odense Steel Shipyard, a leader in the design and construction of very large container vessels, and DNV, a leader in new technologies for classification, have entered into a challenging co-operation for development of new tools for the initial design phase. These tools are based on several of DNV Software’s existing systems for strength assessment interfacing with the advanced 3D ship design system IntelliShip from Intergraph. The complete suite of tools includes, along with a wide range of other features, an interface system with ship hydrostatic analysis systems and rule-based production of class drawings. All these tools are packaged into a new product for early design, called Nauticus Early Design.

Direct Non-linear Hydrodynamic Analysis for Sea-keeping and Ship Structural Analysis
Authors: Jens B. Helmers, Wouter Pastoor and
Frode Kamsvåg, DNV Maritime Solutions;
Torgeir Vada, DNV Software
Wasim is a well established tool for a variety of analyses of ships, both within DNV and at a number of leading shipyards. The paper gives an overview of some of the analysis types that have been performed using this tool and a brief description of the Wasim program.

The paper describes some of the features of Wasim for sea-keeping analysis, computation of sectional loads,,stochastic fatigue analysis and ultimate limit state (ULS) analysis. For the first two features some comparisons are given between model tests and Wasim analyses in order to show the validity of the Wasim results for both mono- and multi-hull vessels. The stochastic fatigue analysis is carried out in the frequency domain using a linear Wasim analysis. An essential part of this analysis is accurate transfer of the wave loads computed by Wasim to the FEM solver. The results presented document the quality of this load transfer. Both external pressures on the hull and internal pressures from fluid in tanks are included in the transferred loads. In the ULS analysis, the load transfer is equally important. In this case a non-linear Wasim analysis is carried out and loads are transferred as snapshots at selected time steps. Again, good quality load transfer is essential for accurate analysis. The paper describes how the quality of the transferred loads is checked using the available tools in the Sesam system. The results presented show that these loads are also transferred with good quality.