Sea Based Maintenance Ship (SBMS)

CDR Bill GreeneLCDR Kai Torkelson

LT Angelos Antonopoulos12 May 2005

2

Purpose of Conversion

• Create a maintenance ship with the following capabilities:– Full I-Level maintenance support for

Marine Corps aircraft and ground vehicles and limited I-Level repair for ships.

– Expeditious deployment and transit to the Joint Operational Area (JOA).

– Conduct sustained operations in the mission area.

3

Design Philosophy

• Minimize changes to baseline hull.• Priorities: 1) Air, 2) Ground, 3) Ship

Maintenance• Utilize Mobile Maintenance Facility (MMF)

concept to provide flexibility and reduce the need for large fixed shops.

• Ease of material movement via well deck, flight deck, cranes, hatches, and internal pathways.

4

Design Goals & Thresholds

50,000 lbs100,000 lbsCrane Capacity

1 LCAC2 LCACsWell Deck Capacity

1 MV-22 or 1 CH-532 MV-22 or 2 CH-53Flight Deck Capacity

9811963Maintenance Crew Berthing

10,725 ft221,450 ft2- Ship Maintenance

25,000 ft250,000 ft2- Ground Maintenance

62,500 ft2125,000 ft2- Aviation Maintenance

Maintenance Capability

ThresholdGoalMeasure of Performance

Concept of Operations

• Provide sea based I-Level maintenance support for Marine Corps air and ground vehicles and ships.

• Provide rapid deployment capability and flexible mission payload via MMF concept.

• Transportation of MEB components to and from the battlefield for repair and return to service utilizing the well deck and flight deck.

• Deploy tiger teams to repair equipment in the field or onboard other ships.

T-AVBCV-67 T-AK

LENGTH (FT) 602951 687

BEAM (FT) 90130 100

FULL LOAD DRAFT (FT) 3435 38

FULL LOAD DISPL. (LT) 23,80082,000 52,878

PROPULSION PLANT STEAMSTEAM DIESEL

SUSTAINED SPEED (KTS) 1830 19

CONVERTIBLE AREA (FT2) 80K100K 307.5K

CARGO VOLUME (FT3) 100K200K 2,000K

TROOPS NA2,480 NA

LCAC 00 0

LANDING SPOTS 1AIR WING 0

BERTHING CAPACITY 3665,597 366

COSTS ConversionConversion MSC charter and Conversion

CREW 3663,117 366

Ship Tradeoff Study

LMSR

951

106

30

63,000

DIESEL

22

397.4K

3,537K

300

1

2

395

Conversion

95

LPD-17 LHD AS-39

LENGTH (FT) 684 844 644

BEAM (FT) 97 106 85

FULL LOAD DRAFT (FT) 23 27 30

FULL LOAD DISPL. (LT) 22,000 40,500 23,000

PROPULSION PLANT DIESEL STEAM * STEAM

SUSTAINED SPEED (KTS) 22 22 20

CONVERTIBLE AREA (FT2) 45K 21K 16K

CARGO VOLUME (FT3) 25K 125K 80K

TROOPS 723 1,687 NA

LCAC 2 3 4

LANDING SPOTS 4 9 1

BERTHING CAPACITY 1,202 2,934 1,363

COSTS Conversion Conversion Conversion

CREW 396 1,247 1,363

Ship Tradeoff Study (continued)

LHA

834

106

27

39,400

STEAM

22

34K

117K

1,710

1

10

2,914

Conversion

1,204

* LHD 8 will have gas turbine propulsion.

Platform Selection

T-AVBAS-39

LHDLHA LPD-17 STD

LMSR

CV-67

T-AK

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Ease of Conversion Factor

Overall M

easure o

f Effectiven

ess

OptimumPoint

ParetoFrontier

Conversion Design Space and Pareto Frontier

Platform Selection

T-AVBAS-39

LHDLHA LPD-17 STD

LMSR

CV-67

T-AK

LPD-17 STRETCH

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Ease of Conversion Factor

Overall M

easure o

f Effectiven

ess

ParetoFrontier

OptimumPoint

SelectedCandidate

Conversion Design Space and Pareto Frontier

Concept Design

SBMS Conversion from LPD-17

SBMSSBMS--11

AVIATION MAINTENANCE

VEHICLE MAINTENANCE

BALLAST TANKS

ELECTRONICS

MACHINERY SPACES

MESS SPACE

CONVERTED LIVING SPACES

STORESWELL DECK

45M HULL INSERT

LIVING SPACES

LIVING SPACES

Arrangements

Cross Section at Bulkhead 11 Looking Aft

AviationMaintenance

GroundMaintenance

ShipMaintenance

AviationMaintenance

Hangar

Arrangements

Main Deck

DeckhouseExtension

Hull Insert

No Change

No Change

LogisticsHatch

Heavy LiftCrane

CargoElevator

Light Crane

Aviation Maintenance Area

Aft Forward

Flight D

eck

Hull Insert Effects

Original LPD-17

SBMS MMR’s AMR’s

Structural AnalysisStillwaterMax Bending Moment 120,051H mMTDeck Stress 45 N/mm2

Keel Stress -39 N/mm2

Hogging

Max Bending Moment 244,067H mMTDeck Stress 91 N/mm2

Keel Stress -80 N/mm2

Sagging

Max Bending Moment 51,195S mMTDeck Stress -19 N/mm2

Keel Stress 17 N/mm2

•Appropriate limit for primary bending stress for HTS was found to be Fb = 131 N/mm2 : Analysis Successful

Intact Stability

High Speed Turn

Equilibrium Angle: 0o Required <15.0o

Maximum Righting Arm: 7.971m Required >0.059m

Reserve Area: 5 m-rad Required >0.46 m-rad

REQUIREMENTS MET

Wind Heel

Wind Heel Angle: 2o

Maximum Righting Arm: 8.045m Required >0.707m

Reserve Area: 5 m-rad Required >2 m-rad

REQUIREMENTS MET

Damaged Stability

0608.39616-17-18-19-20-21

1618.36315-16-17-18-19-20

2618.65013-14-15-16-17-18

3618.81712-13-14-15-16

3628.91911-12-13-14

3628.86410-11-12

3638.2709-10-11

2648.5068-9-10

3648.3777-8-9

3628.2815-6-7-8

2608.3314-5-6-7

0608.3963-4-5-6

0628.5551-2-3-4

Angle(deg)Max GZ(deg)Compartments

Flooded

Static HeelAngle at GZ (m)

Full LoadDamagedCondition

17

Design Summary

152,698117,000AVAILABLE VOLUME, m3

129,45797,000REQUIRED VOLUME, m3

35,26925,000AVAILABLE AREA, m2

35,01825,800REQUIRED AREA, m2

15,40015,400SHAFT POWER, KW

9,0009,530ENDURANCE AT 20KTS, nm

20.923.1MAX SPEED, kts

19.722.1SUST SPEED, kts

0.9410.941CX

0.7120.647CP

11.510.7GMT

19.219.2DEPTH, m

29.529.5BEAM, m

245200LBP, m

SBMSLPD-17 Original

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Performance Summary

50,000 lbs110,000 lbs100,000 lbsCrane Capacity

1 LCAC2 LCACs2 LCACsWell Deck Capacity

1 MV-22 or 1 CH-53

2 MV-22 or 2 CH-53

2 MV-22 or 2 CH-53

Flight Deck Capacity

9819901963Maintenance Crew Berthing

10,725 ft211,457 ft2 *21,450 ft2- Ship Maintenance

25,000 ft232,884 ft250,000 ft2- Ground Maintenance

62,500 ft281,204 ft2125,000 ft2- Aviation Maintenance

Maintenance Capability

ThresholdSBMS DesignGoalMeasure of Performance

19

Conclusions & Recommendations

• Well Deck capability critical.• Modified Repeat Amphib vs. “Big Box”

conversion.• The MMF should be explored for other

maintenance applications.• Next design iteration should study

maintenance throughput requirements.

20

Questions??

SBMSSBMS--11