life and work of a naval architect
TRANSCRIPT
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Life and Work of aNAVAL ARCHITECT
ASME BC and ASME UBC Technical Panel Presentation
Callum Campbell, P.Eng. Senior Naval Architect
3 March 2013
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naval architects
As kids,
might dream of designing …
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Something this beautiful
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Or this grand
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Or this big
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Or this challenging
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designing a hard-working harbour tug
But in reality, a Naval Architect is just as happy
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Or a local ferry
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Or even one of the ever-present deck barges.
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Big and small, the common thread is …
A naval architect works in projects of all scope and scale
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professionals in
Naval architects are
things that float
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professionals in
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professionals in
• SHIP STRUCTURES• STABILITY• RESISTANCE AND POWERING• SEAKEEPING• DESIGN
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This is a ferry under construction at a shipyard in Alaska
SHIP STRUCTURES
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•Follow the shape of the hull•Adhere to rules for scantlings•Provide access for construction and inspection•Compatible with production methods of shipyard•Minimize space for casks of wine
SHIP STRUCTURES
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casks of wine?Yup, it’s true.
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• Historically, the usefulness of a ship is measured in a unit called “gross tons”.
• A gross ton is not a measure of weight, but actually a measure of internal volume where the volume unit is that of a wine cask.
• There are prescriptive regulations about the way to measure gross tonnage, but it turns out that by filling the ship with steel structure, the tonnage (or wine carrying capacity) can be decreased substantially.
• Why would you want to do this? By reducing tonnage, an owner or operator can usually pay fewer taxes, employ fewer crew, etc.
SHIP STRUCTURES
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SHIP STRUCTURES
Here’s the internal framework of that ferry
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SHIP STRUCTURES
The ends of the ship are filled with structure which …
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SHIP STRUCTURES
renders these areas useless for carriage of wine …
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SHIP STRUCTURES
and therefore reduces tonnage …
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SHIP STRUCTURES
and benefits the ship owner.
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STABILITY
This is a crane barge. It is used for waterfront construction.
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STABILITY
A naval architect calculates the lift capacity of the crane
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• Two Problems:– Problem 1:
• The lift capacity of the crane is dependent on the side to side list of the boom.• A crane might pick up a lift over the end of the barge, and then rotate over the side • In doing so, the incline of the boom will change, and so will the lift capacity• The naval architect must answer: How much boom list?
– Problem 2:• Secondly, the stability of the system must be investigated • Stability typically involves drawing a conclusion about the centre of gravity relative
to the centre of buoyancy.• The naval architect must make sure that the deck stays well above the water, and
that the barge always has lots of reserve stability, or righting energy, to ensure it will always stay upright
STABILITY
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• To assess the situation, a naval architect calculates the exact centre of gravity
for any given lift loadat any radius
and at any angle of rotation• Once calculated, a naval architect uses specialized hydrostatic
software to calculate the crane capacity, and the stability performance of the crane/ barge.
STABILITY
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Resistance and PoweringRESISTANCE AND POWERING
This is a picture of the ferry in drydock
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• The twin screw vessel was originally configured for each propeller to be driven by two main engines through a gearbox, making for four main engines in total.
• Since the relatively high speeds that the vessel was originally designed for were no longer required, the owner wished to operate only a single main engine per propeller, and wanted to investigate propeller modifications that could be required to accommodate the change in shaft power.
• Using specialized software, a naval architect computes the resistance of the hull, the power prediction, and the characteristics of the propulsors (i.e. shaft speed, propeller diameter, propeller shape).
RESISTANCE AND POWERING
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SEAKEEPING
This is a typical coastal container barge.
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SEAKEEPING
This type of barge is towed by a tug along the coast.
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• Seakeeping, is an investigation into a ship’s response to ocean waves.
• The question is – in what sort of seaways will be dangerous for this type of transport – when do the waves become “too big” to continue operations?
• This type of analysis is undertaken by modelling the hull, and using specialized software to predict the Response Amplitude Operators which, when coupled to the spectrum of a seaway, help to predict the motions.
• Using the results, we can present operating instructions for the master of the tug boat to help provide guidance on what to do.
SEAKEEPING
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DESIGN
Design is a synthesis of the techniques previously described
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DESIGN
This is the design spiral.
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DESIGN
It shows the process of design …
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DESIGN
An idea converges to a final product through iterations
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• A naval architect spends a few weeks preparing a concept design, where the structure, the stability, and the resistance and powering are loosely calculated.
• If the concept proves valid, the design moves onto a preliminary design phase. This work might take a few months, and involves a more detailed investigation into weights, centers, stability, powering, and equipment selection.
• From there, the design moves onto details design where the design is fully, and clearly defined, and lastly production design, which is the way to convey all the information of the design to the shipyard.
DESIGN
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So if as a kid you had dreams like this …
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you’ll start worrying about nightmares like this
Once a naval architect,