virginia tech dd-21 destroyer concept · conclusions and future work zassessment of dd-21 – ship...
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Virginia TechVirginia TechDDDD--21 Destroyer Concept21 Destroyer Concept
David WoodwardBen SpinaJon Law
Steve DarsieAndrew GirdlerJessica Smoldt
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Mission Needs StatementMission Needs Statement
Dominance in independent and joint opsMission and Threat AnalysisNon Material AlternativesMaterial Alternatives– Evaluate the impact of speed on concept design
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MNS, cont.MNS, cont.
Constraints– Sustained speed of at least 40 knots– Optimize effectiveness vs. cost– Reduce manpower– Minimize production time– Maximize survivability – Satisfy pollution laws
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Required Operational Required Operational CapabilitiesCapabilities
Amphibious Readiness Group (ARG) EscortCarrier Battle Group (CBG)Mine Counter Measures (MCM)Non-Combatant Ops / Humanitarian (NCO)
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Concept Exploration ModelConcept Exploration Model
Three Hulls– Transport Factor used in choices
Evaluate hull forms in terms of load capacity vs. speed
– Mercier-SavitskyRegression formulas produced for resistance data
– FastShip AtlanticResistance from existing data of model testing
– SS United StatesResistance from existing data of ship
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Concept Exploration Model, Concept Exploration Model, cont.cont.
Propulsion Choices– Waterjets– Surface piercing propeller– Conventional propeller
Weapons and Missions Options
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NonNon--Dominated FrontierDominated FrontierDD21 Non-Dominated Frontier - Feasible
0.000
0.100
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0.400
0.500
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0.700
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1.000
800 1300 1800 2300CFOL ($M)
OM
OE GEN 1
GEN 30GEN 80GEN100
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Baseline Concept DesignBaseline Concept DesignHI BBH BCD BBL LO
LBP[ft] 598.48 537.83 437.4 414.21 404.41Beam [ft] 103.74 93.22 67.7 64.02 62.51Draft [ft] 26.33 23.66 19.09 18.23 17.79D10 [ft] 49.87 44.82 35.02 34.52 35.17Lightship [LT] 9683.8 7200.8 3841 3577.5 3278Full load displacement 16164.6 11750.9 5870 5357.8 4998.1FL Vertical CG [ft] 30.47 27.72 24.68 21.23 20.97
Np 6 4 4 4 4Ve 35 35 35 35 35Nhelo 2 2 2 0 0Range 10000 8000 4000 4000 4000Manning 128 125 73 66 50
Sustained speed 42.87 40.11 41.96 42.28 42.44Maximum speed 45.03 42.22 43.8 44.23 44.38
C fola [$M] 1803.9 1450.4 1297 1057.2 971.8OMOE 0.842 0.813 0.807 0.631 0.559
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Hull Form and StructureHull Form and Structure
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Hull Geometry
Space & Arrangements
Weights andStability
Structures
Resistance &Power
HM&E
Seakeeping &Maneuvering
Manning &Automation
Cost, Riskand Effectiveness
Requirements
Concept & RequirementsExploration
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Hull Form DevelopmentHull Form Development
FastShip Atlantic Offsets Scaled in HECSALVRead offsets into Fastship programSurface fit to offsets
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Hull FormHull Form
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Structural Design and Structural Design and AnalysisAnalysis
Three watertight sections of the hull – One centered at midships– One section forward and one aft of midships
Tested in Maestro– Moments and Shear Forces from HECSALV
Materials– Composite deckhouse to reduce weight– Standard steel construction for hull
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Maestro Model, Stern ViewMaestro Model, Stern View
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Maestro Model, Internal StructureMaestro Model, Internal Structure
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Maestro Model, Adequacy Parameter Maestro Model, Adequacy Parameter Minimum ValuesMinimum Values
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Resistance, Power and Resistance, Power and Mechanical ArrangementsMechanical Arrangements
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Resistance and PowerResistance and Power
LM-6000Waterjets large enough to provide power – Not currently available– Scaled by inlet diameter vs. kilowatts
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WaterjetWaterjet ArrangementArrangement
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Resistance and Power Resistance and Power RequirementsRequirements
NAVCAD software used to calculate Resistance, PE, Fuel Consumption, and EfficiencyFuel Consumption at endurance speed of 35knts: 2554.78 gphPropulsive Efficiency at 35knts: 69.75%PE at 35knts: 83362.41 hpPE at top speed: 149616.54 hp
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Mechanical and ElectricalMechanical and Electrical
Dewatering systems of waterjetsForward Emergency GeneratorPDSS generators Smart Ship Technology to enhance survivability
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Dewatering Concept DesignDewatering Concept Design
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Dewatering SystemDewatering System
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Machinery RoomMachinery Room
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Space, Arrangements and Space, Arrangements and ManningManning
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Space and ArrangementsSpace and Arrangements
Radar Cross Section– Every surface at 10 degrees
Heat Signature– Exhaust system
Deckhouse placementHelo deck placementInternal module arrangements
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Arrangements: Profile ViewArrangements: Profile View
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Arrangements: Deckhouse Arrangements: Deckhouse PlanPlan
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Arrangements: Hull PlanArrangements: Hull Plan
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Arrangements: BerthingArrangements: Berthing
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Weights, Centers and Weights, Centers and Seakeeping AnalysisSeakeeping Analysis
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Loading and CentersLoading and Centers
Total Weight = 6223 LTLCG = 215 feet aft of FPVCG = 22.1 feet above BLTCG = 0.06 feet (Port)
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SWBS ReportSWBS ReportSWBS Report
25%
7%
3%
6%
13%6%
9%
31%100
200
300400
500600
700
F00
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Seakeeping Limit Criteria by Seakeeping Limit Criteria by SubsystemSubsystem
Helo– Vertical velocity = 6.5 ft/sec at landing spot– Roll = 5 degrees
Personnel– Vertical acceleration = 0.4g at bridge– Transverse acceleration = 0.2g at bridge– Roll = 8 degrees
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Seakeeping Limit Criteria, Seakeeping Limit Criteria, cont.cont.
VLS– Vertical acceleration = 0.6g at launcher
outboard corner– Transverse acceleration = 0.7g at launcher
outboard corner – Roll = 17.5 degrees
All– Pitch = 3 degrees
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Mission SystemsMission Systems
Anti-Aircraft WarefareAnti-Surface WarefareAnti-Sub Surface WarefareAdvanced C4-I systemMine Countermeasures Naval Surface Fire SupportSensor and Electronic WarefareStrike Warefare
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Weapons SystemsWeapons Systems
VLS MissilesAdvanced Gun System2 Lamps MK III HelosPhalanx CIWS
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Hydrostatics, Intact and Hydrostatics, Intact and Damage StabilityDamage Stability
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Hydrostatics and StabilityHydrostatics and Stability
Intact stability – DDS 079-1– Two loading cases for each of three stability
requirementsBeam Seas and RollingHigh Speed TurningTopside Icing
Damage stability– DDS 079-1 – 54.75 foot opening required (12.5% of LBP)
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Hydrostatic CurvesHydrostatic Curves
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Beam Seas and Rolling, FullBeam Seas and Rolling, Full
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Strength Curves, Full LoadStrength Curves, Full Load
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Limiting Case Damage Limiting Case Damage StabilityStability
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Final AnalysisFinal Analysis
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Final Concept DesignFinal Concept Design
Concept Baseline– LBP = 437.4 ft– Beam = 67.7 ft– Draft = 19.09 ft– Disp. = 5870 LT– Range = 4000 nm– Sustained Speed =
41.96 knots– Manning = 73
Final Concept Design– LBP = 438 ft– Beam = 67.7 ft– Draft = 19.14 ft– Disp. = 6223 LT– Range = 4000 nm– Sustained Speed = 43+
knots– Manning = 92
Cost Estimates– Lead Ship = $1.3 Billion– Follow Ship = $900 Million
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Conclusions and Future WorkConclusions and Future WorkAssessment of DD-21– Ship is stable, but stiff– Low profile for reduced radar cross-section– Can adequately protect the areas assigned– Waterjet arrangement will need to be tested– Quality of life has been improved
Recommended improvements– Testing of hull type– Further research of waterjet technology and
improvements– Improve weight distribution to improve seakeeping
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Final Concept DesignFinal Concept Design
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Questions?Questions?
Thank you for your time