DSTO RESEARCH INTO MULTI-HULLS Dr Stuart Cannon DSTO-AMRL
Outline of Presentation Introduction to DSTO aims Trials on multi-hulls Collaborative links Future research activities Concluding remarks
Outline of Presentation Introduction to DSTO aims Trials on multi-hulls Collaborative links Future research activities Concluding remarks
AUSTAL SHIPS Pty. Ltd. Adnan Menderes Collaboration between DSTO and Austal Ships. Ship motion sea trial was carried out on Adnan Menderes during it s delivery voyage toturkey. strains, accelerations, pitch, roll and wave height were recorded. Wave Height Comparison Two types of wave height sensors were compared. 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 wave Thorn wave TSK 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
HMAS Jervis Bay Principal Particulars Length Beam Draught Power Service Speed 86.14 m 26.0 m 3.54 m 28320 kw 43 kn Made 107 return trips to East Timor. Also deployed to go to Ashmore Reef In total, she travelled more than 110000 nm. Most of this distance was made at a speed of 40 kn. Built by the International Catamarans (INCAT) Chartered by the RAN in May 1999 for 2 years
HMAS Jervis Bay Trials ignature Trials a) Radar Cross Section b) Infra Red c) Synthetic Aperture Radar (and Inverse SAR) d) Jindalee Tracking Trial e) Wake Measurement f) SECAR Tracking Trial g) Acoustic (programmed by MHQ)
Ship Motion Trial on HMAS Jervis Bay Objectives of this research Assess new hull form Validate numerical software to extrapolate Assess suitability of Motion Sickness Indicator Carried out in 2m waves 25 minute data runs 3 speeds 5 headings 0.24 FOLLOWING SEAS 0 Vertical Acceleration at LCG, V=20 kn 0.21 0.18 0.15 315 45 measured predicted 0.12 0.09 Acceleration (g) 0.06 0.03 0.00 0.03 0.06 0.09 270 90 BEAM SEAS 0.12 0.15 0.18 0.21 225 135 Undertaken: Off the coast of Sydney, July 2000 0.24 180 HEAD SEAS
PRESSURE SIGNATURE - MOD Measured over wide speed range Influence of water jet propulsion Classified presentations given Pressure Time (sec) Predicted Pressure Measured Pressure Bow Stern MOD - Mine Warfare Signatures Group John Barnes, Peter Formby,, Mark Hallet,, David Matthews and John Mentjox
Acoustic Ranging - MOD
NWBS TRIUMPHANT Collaboration between DSTO and NWBS. AIM: Assess hull for potential use as a naval platform and obtain ship motion baseline for this type of hull. A dedicated ship motion trial undertaken in variable waves of up to 4.4m SWH. Accelerations, pitch, roll and wave height were recorded. Length WL 52m
NWBS Triumphant Wave Height Sensor Instrumentation suite
Outline of Presentation Introduction to DSTO aims Trials on multi-hulls Collaborative links Future research activities Concluding remarks
Links with USA Sea trial results IEP ABCANZ 97-12 HYDRODYNAMIC LOADS WORKING GROUP DREA Dartmouth, Canada 18 th 19 th October 2001 ABCANZ 97 12 IEP HMCS NIPIGON Structural Loads Sea Trial Dec 1997 NWBS Trimaran Seakeeping Trial June 2001
Links with US - Signatures The Technical Cooperation Program (TTCP) HMAS Jervis Bay - Pressure and Acoustic (Classified)
Modelling and Simulation Studies 3-D Panel method : PRECAL Cooperative Research Ships (CRS)/(CRN) Navies Development Benefits: Three-dimensional analysis Monohulls and Multi-hulls Provides: 3-D Hydrodynamic properties Motion characteristics Responses Accelerations Hull Pressures
SEA LANCE Naval Postgraduate School Seaborne Expeditionary Assets for Team 2000 Littoral Access Necessary in Contested Environments
Outline of Presentation Introduction to DSTO aims Trials on multi-hulls Collaborative links Future research activities Concluding remarks
Motion Sickness Prediction Tool Motion Sickness affects navy personnel ability to undertake their duties at sea. Motion Sickness also affects the readiness and ability of troops undergoing transit by sea.
Collaboration with Australian Maritime College Research on the Resistance and Seaworthiness Assessment of Novel Hull Forms The research will provide Better understanding of resistance and motion characteristics of novel hull forms, Modelling and simulation tools in assessing resistance and seaworthiness of novel naval platforms, and Demonstrated tangible fuel cost savings by the application of novel hull designs.
Vessel Fuel Usage Modeling Determine fuel draw downs per location Scenario based fuel consumption/costing Fuel buying/delivery strategies Assess through life fuel usage for various ships/hull forms 1. Instructions The RAN "THIRSTY" (Time HIstory of Replenishment & SusTainabilitY) Fuel Model, single vessel - Main Menu operational F44 min cap 2a. Run Simulation 2b. Choose AIP Scenario need to order F44 fuel 3a. Change Ship Parameters 4. Observe Ship's Passage 3b. Choose Vessel/Aviation Type F44 order volume F44 Refin&Transport F44 resupply 5. Observe Ship's Fuel Level v time F44 supply 6. Results and Outputting to File F44 Refuel days delay operational F44 max cap Print Pages Print Setup... Save Save As... Close Model Quit
Outline of Presentation Introduction to DSTO aims Trials on multi-hulls Collaborative links Future research activities Concluding remarks
Concluding Remarks DSTO are assisting the RAN in understanding this type of technology for our environments The Australian high Speed craft industry have been extremely cooperative in assisting DSTO Lessons learnt are shared with US on a government to government basis
QUESTIONS? HMAS Westralia replacement?