LOGISTICS VESSELS
A land-based HRAS test rig will be trialled at HMS Raleigh (Rolls-Royce).
system configuration drives separate inhaul and outhaul barrels for each wire, which means the tensions can be adjusted as appropriate. Design and development work to date has
been supported by computer modelling and simulation. Rolls-Royce has developed its own mathematical and dynamic model, which was originally developed internally for the 2-tonne rig, and has been used to establish baseline HRAS parameters at the concept stage. The MARS IPT is also in the process of
developing a RAS Simulation Capability, a High Level Architecture simulation of the complete RAS process that will compliment Rolls-Royce’s existing expertise. It will be capable of modelling, inter alia, the effects of hydrodynamic forces and jackstay tensions on ship interaction, and will also include wind and wave effects on the transfer load. On current plans, the MARS IPT will award
Rolls-Royce a Phase 3 contract in late 2007 for the manufacture of a prototype system and construction of the land-based demonstrator. This will then be used in a Shore Trials Demonstration (Phase 4) commencing at HMS Raleigh – a naval training establishment – in September 2008. The land-based demonstration will capture
real-time data on structural loadings to support fatigue determinations, provide data for ship structural integration, demonstrate system interoperability, and refine initial control system parameters. It will also demonstrate safe operation of equipment, identify and eliminate operational issues, prove human factors analyses, and maximise crew utilisation. System trials will consider a number of test
variables, including load mass and speed, load sizes, and sea states (simulating both frequency and amplitude). System aspects to be reviewed include jackstay deflection during load transfer (dynamic and static), speed of transfer, system power demands (including motor loads and heat balance), component thermal stability, environmental factors, safety and emergency systems, and validation of reactionary loads in the mast, drums, and structures. Shore testing will also be used to fully
explore the design envelope. Issues such as repeatability, endurance, operability, availability, reliability, and maintainability will all be examined during this phase. Currently, the HRAS design and
development programme is to conclude with a Sea Trials demonstration, starting in April 2009. This Phase 5 activity envisages the installation of the prototype HRAS rig aboard a vessel, for at-sea testing. However, the MARS IPT and Rolls-Royce continue discussions to quantify the cost/benefit to be derived from sea trials, given the significant investment required to modify a legacy ship, and the unavailability of a platform within the timeframe to support MARS Main Gate in late-2008.
WARSHIP TECHNOLOGY MAY 2007
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