T ake unrep ship uss hokie
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T-AKE UNREP Ship USS Hokie PowerPoint PPT Presentation


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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

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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


Optimization

Optimization


Uss hokie

Satisfies all Mission need requirements

USS Hokie


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


Hull arrangements

Hull Arrangements


Main machinery arrangements

Main Machinery Arrangements


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


Cargo oil midship sections

Cargo Oil & Midship Sections


Structural adequacy

Structural Adequacy


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


Weights distribution

Weights Distribution


Hydrostatics

Hydrostatics


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


Questions

Questions?


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