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Monday, June 29, 2020 

Napa of Finland has released the latest version of its ship design software, Napa 2020.1, which provides several new and enhanced features as well as minor improvements and corrections.

Napa Designer contains improvements to modelling tools and visualisation, with improved curve modelling tools to create grid curves faster and shape them easier according to the needs. Compartment visualisation has been improved with a possibility to visualise the surface representation, calculation sections and edge curves.

With the new compartment definition tool, a compartment can be created by clicking a point on the graphics. The resulting compartment is created based on the bounding surfaces in the structure arrangement table. Compartment models can be exported into all supported formats, such as HTML. The exported file includes the hierarchical tree, name, colour and other properties such as the volume, centre of gravity and loading purpose.

Stability calculations in Napa have been updated by a set of several improvements and corrections, for example to container loading, probabilistic damage stability calculations, stability criteria and several Manager applications. The Second Generation Intact Stability (SGIS) calculation has been updated according to the latest updates in the document SDC 7/WP.6.

In response to user feedback, the probabilistic damage stability analysis according to SOLAS II-1 now includes output of watertight limits for structural design purposes in PROB Manager. The limits are generated based on the damage conditions contributing to the current attained index, and therefore can be used to measure the maximum pressure heads against the hull and internal bulkheads. The application includes limits for new unprotected and weathertight openings for which the damage stage selection may be different. The limit surfaces can be visualised with the 3D model in NAPA Designer.

A new stability criterion has been added, in order to analyse the maximum dynamic heeling angle the ship may reach when subjected to a step-wise external heeling moment.

For structural design with Napa Steel, the structure model can be now divided into building blocks. It is possible to have multiple block systems and each blocks limits can be defined using coordinate limits or set of surfaces. The block system can be also exported from Napa to other CAD file formats.

A list output can be produced directly from Napa Designer for the structure model, sorted, filtered and grouped as required.

Commenting has been added as an official Napa Designer feature. Comments can contain for example snapshot images from the model and other file attachments. The comments markers are visible on the graphics.

Now, any kind of drawing can be created with Napa Drafting. The latest update enables a section with an inclined plane or a predefined surface of any kind to be created easily. Users can define a predefined set of annotations that are added to the section automatically after the import of a section, while the Drafting user interface has updated icons and colours.

Finite Element Meshing (FEM) improvements include updated automatic meshing tools, in order to take into account better structural details such as seams, holes, cut-outs, notches and end-cuts. Intuitive fine mesh tools for mesh refinement for local analysis are now available. The FE mesh quality can be analysed with the FE Mesh Check Tool and the visualisation of the FE mesh has been improved.

The Interface from Napa structure model to Aveva Marine is completely renewed with new technology based on APIs of Napa and AM. The interface is intended to continue in AM Hull detail and production design work started in Napa Designer.

Another new interface based on Napa API technology is the Solid CAD Interface, producing a solid 3D step file from  Napa Designer structure model. The solid model has real plate thicknesses instead of moulded surfaces and in addition stiffener and bracket geometry is corrected based on correct material side of the structures.

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