The detailed construction design refines the basic 3D assembly based on defined seams and butts, classification rules, and engineering standards. This step is crucial as it finalizes the construction drafting and provides essential input for the production design phase.
Typically, detailed construction involves creating primary and secondary plate parts, adding specific details and cut-outs, and designing stiffeners while considering external equipment and various requirements from different stakeholders.
Did you know? The detailed construction phase is where much of the ship's structural integrity and efficiency is determined. It's a complex process requiring a deep understanding of both shipbuilding principles and practical considerations.
Designing the detailed construction in MasterShip
The video shows how to design a detailed construction. Designing a detailed construction involves basically two structural entities: plate parts, and stiffeners. We have made separate articles on these topics. Here below are some of the best practices from the engineering perspective for designing a detailed construction, and how MasterShip supports.
- Drawing detailed plate parts: How to design detailed plate parts.
- Drawing stiffeners: How to design stiffeners.
- Use parametrical modelling: MasterShip offers a functionality called Template Orientated Modelling (TOM) for parametrical modelling parts and stiffeners.
- Consider the seams & butts arrangement: Multiple welds that are close to each other and in roughly the same direction lead to high stress concentrations, and can cause the material to deform or crack. Avoid sharp crossings of seams and butts with primary and secondary scantlings.
Tip: Including the shell expansion and 3D model of the seams & butts arrangement into the assembly model as an XRef, can help to visually check for these sharp crossings.
- Consider external components: A ship consists of multiple disciplines, with the construction just being one of them. All these disciplines should fit together. External components, such as piping systems, engines, etc. directly influence the construction design. Importing external components, greatly helps with designing a compatible construction, and can also help a lot when checking for consistency and clashes.
- Checking for consistency: Drawing parts in a sectional drawing gives you a 2D view. Of course, the ship's construction is three dimensional, and the construction should be consistent in all three dimensions. With the function SHIPSECTIONS you can get the outline of solids from other sectional drawings in your current drawing. For example, with this function, you can easily identify a stringer passing a frame drawing.
You can also visually check the 3D construction in the assembly file (assembly.dwg). Also, the MasterShip Workshop Assistant (WSA) offers a 'clash detection' for solids. This way, you can identify if there are plates, stiffeners, equipment, etc. intersecting each other.
Other considerations
When drawing the construction, it should meet the technical requirements and standards from the classification society, engineering department and shipyard. The construction model has to fulfill all the specified requirements, for adequate building and later practical use of the ship.
This is expert knowledge. A draftsmen is usually not able to be aware of all the requirements specified. Therefore, reviewing of the 3D model by the party that supplied the requirements, or other relevant stakeholders, is very important. To have your model reviewed, it is necessary to export and share your 3D model with the right tool.
Output and successive process steps
Following these best practices will result in a detailed 3D assembly model This model can then be used for various downstream tasks, including:
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