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We were recently given the opportunity to carry out some
FE work for
Powerfield Ltd, part of the Rolls-Royce group specialising in power
systems for the British Army and Royal Navy.
This was a job with a difference: the new range of Field Electrical
Power Source (FEPS) mobile generators are required to be
air-transportable
and the tests involved confirming structural integrity and detailed
stress calculations of the equipment on 3m and 5m slings under a
Chinook
helicopter at 120 knots.
The generator set and trailer, which together weigh over 3 tonnes,
were suspended with constraints applied at the centre of gravity of
the unit and loads along the direction of the sling arms. The loads
were factored to give a 5g loadcase - a weight of 16 tonnes on the
attachments. Powerfield had obviously put a great deal of thought
into the design because it came through the analysis with flying
colours!
Final airworthiness validation was carried out by the RAF.
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