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Virginia Tech Naval Architecture. T-AKE UNREP Ship USS Hokie. Michael Fetsch Jen Sickmund Tobey Coombe Joshua Hammond Conrad Cooper . Design Overview. Optimization Hull design Resistance and Propulsion Arrangements Structures Weights and Stability. Mission Need.

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t ake unrep ship uss hokie

Virginia Tech Naval Architecture

T-AKE UNREP Ship

USS Hokie

Michael Fetsch

Jen Sickmund

Tobey Coombe

Joshua Hammond

Conrad Cooper

design overview
Design Overview
  • Optimization
  • Hull design
  • Resistance and Propulsion
  • Arrangements
  • Structures
  • Weights and Stability
mission need
Mission Need
  • To replace current Combat Logistics Force
  • Speed: 20 Kts
  • Range: 14000 NM
  • Capacity to carry a combination of:
    • Dry stores
    • Refrigerated stores
    • Ammunition
    • Cargo fuel
design parameters for optimization
Design Parameters for Optimization
  • Genetic Optimization of design using regression data analysis
  • Design variables
  • Measures of Performance
  • Values of Performance
  • Total Ownership Cost
hull design
AE36 Parent Hull

Single shaft, similar design speed, Kilauea Class UNREP ship

USS Hokie

LWL – 680 ft CB - .577

B – 99 ft CP - .592

D – 69 ft

T – 38 ft

Disp – 42288.7 lton

Hull Design
resistance and propulsion
IPS power plant

Holtrop-Mennen Resistance calculations

Full Electric Load analysis and Fuel consumption done in spreadsheet

Fixed Pitch Propeller optimization

Resistance and Propulsion
optimized propeller characteristics
Optimized Propeller Characteristics
  • 5 Blade, B-Series
  • EAR = 0.710, P = 25.1 ft, D = 24 ft, eff. = 0.7131
  • Design Speed of 20 kts
arrangements
Arrangements
  • Cargo flow and efficiency were of the utmost importance throughout this stage of design
main engine arrangements
Main Engine Arrangements
  • 2 LM2500 gas turbine marine generator sets
  • Centerline bulkhead separates gen-sets
  • Auxiliary engine is a 2000kW diesel generator
motor arrangements
Motor Arrangements
  • 2 21MW propulsion motors w/ converters
  • Centerline bulkhead also separates motors
deckhouse arrangements
Deckhouse Arrangements
  • MSC Standards – 136 Crew
structure
ABS were used to find initial scantlings

Full Ship Maestro Model was used for further structural analysis

Structure
hull subdivision
Hull Subdivision
  • Subdivision optimized as a Passive Defense Capability
weights and stability
Weights and Stability
  • Weight distribution by SWBS designations
  • Distributions calculated for Lightship, Full Load, and 60% full cargo loading cases
  • Intact and Damage Stability cases were examined for several loading conditions and damage cases using HECSALV software
intact stability
Intact Stability
  • Stability analysis for Arrival, 60%, and Full Load conditions respectively
full load damaged stability
Full Load Damaged Stability

Using 15% LBP Criteria (Approx: 102 ft.)

There were three worst case scenarios

a: Starboard Cargo Oil 6, Cargo 1, Cargo 2

b: Forepeak, Foretank, Starboard Cargo Oil 2 and Cargo Oil 4

c: Cargo 4, Starboard Cargo 6 and ER 2

full load damaged stability1
Full Load Damaged Stability
  • Worst case scenarios

a:

b:

full load damaged stability2
Full Load Damaged Stability
  • Worst case scenarios

c:

continuing analysis
Continuing Analysis
  • Seakeeping
  • Structural Improvement
ad