Feature 4 | CAD/CAM
Figure 4: Use of JT in the Shipbuilding Ecosystem.
• Data Exchange: Use of the JT format can facilitate data exchange between all
• Use in PLM: PLM provides a shared platform for effectively capturing,
stakeholders in a shipbuilding project, for example between the shipyard, design agency and suppliers.
representing, organising, retrieving and reusing product-related lifecycle information within and between companies, and to support the integration of existing software systems, including CAD/CAM/CAE (Computer Aided Engineering) and ERP/SCM (Supply Chain Management). PLM needs to support a collaborative environment where information and knowledge is transmitted between geographically distributed applications and users, and conventional representations such as CAD models are not optimised for such environments. While the STEP standard has been expanded from product design phase to incorporate life cycle phases (like maintenance and repair), it is not easy to implement because of
used in shipbuilding, the readability of old proprietary CAD formats can not be guaranteed. JT can be extracted from CAD/PLM systems and used for archiving (LTDR). Non-geometric data and structure information is covered by PLM metadata containers like PLM XML.
extensive volume of software objects and consequent
As shown in Figure 4, JT as a neutral large file sizes. JT
• Replacement of 2D drawings: Since all information needed to process parts
provides a very good format for use in PLM.
and assemblies can be included in the JT file, it provides an option to reduce the dependence on 2D drawings. In many cases 2D drawings (like block assembly drawings for complex steel structures) take time to understand and are prone to misinterpretations. In these cases, the use of JT can complement or
substitute these
drawings, and helps to save time and reduce errors.
lightweight format can handle several processes in design, construction and lifecycle
support for the shipbuilding
industry. The applications of JT go beyond visualisation, so it is possible to optimise product engineering processes by integrating a JT based solution into selected processes. Shipyards can use a combination of
JT supported processes along with
processes which need the use of native CAD and/or STEP. JT version 8.1 has been published by the
International Standards Organisation (ISO) as a publicly available specification (PAS). It is expected that JT will be available as an ISO standard by early 2012. NA
DELFTship launches version 4.27
Te Netherlands-based DELFTship has launched the latest version of its hull form modelling programme.
hydrostatics in waves, along with improvements such as automatic update routine. According to DELFTship earlier software was incapable of running some
T 44
he latest version of DELFTship sees the release of it latest feature, the calculation of
elements of the programme in Windows XP or Windows 7/Vista with the user account control (UAC) enabled. Te calculation of hydrostatics in waves
is integrated into the professional hull modeller as well as various extensions. It can be used to calculate the influence of waves on the hydrostatic, stability,
bending moment and shear force. Another application which can be
found integrated into the inclined hydrostatics extension is the visualisation of a ship moving through a wave length and height specified by the user. The animation can be saved directly to an animated GIF file. NA
The Naval Architect January 2012
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