integrated eu-mop system design

© 2008 EU-MOP Consortium

Integrated EU-MOP System Design

Madrid, Spain 24 January 2008

Yiannis Ventikos Dept. of Engineering ScienceUniversity of Oxford


Specification of the EU-MOP system

“A scalable number of autonomous vessels, operating in a coordinated manner, capable to combat a variety of oil-spills in a multitude of marine environments”


System vs. Unit Design

The EU-MOP design process has been an unusualengineering task:

We have put together a system aimed at fulfillinga pre-specified task; The units comprising the system are complex devices with specificationsthat are part of the design effort.

System Level(strategic/operational)

Unit Level(technical)


System

Unit

EU-MOP design levels

Strategic


Conceptual design approach

Input information• Oil spill characteristics

– Oil types– Age– Spill dimensions

• quantity/volume• surface area,

shape– Spill distribution

• Environmental conditions

Determine • Preliminary design

– Unit volume, weight– Main characteristics– Manufacture

materials• Power consumption

DecideMost probable operating policy

Action Time

Number of Drones

Nantes Meeting, June 2005


Catamaran integrated design


Strategic level

?

N

???

?

?Type 1 = ?Type 2 = ?Type 3 = ?Type 4 = ?

Type 1 = ?Type 2 = ?Type 3 = ?Type 4 = ? Type 1 = ?

Type 2 = ?Type 3 = ?Type 4 = ?

Type 1 = ?Type 2 = ?Type 3 = ?Type 4 = ?




Strategic level

Type 2:

14 units

Type 4:

2 units

Units allocation for confronting spillsin the south of Spain (Mediterranean)


System/swarm level

?

EU-MOP Artificial Intelligence needs to perform systems operations:

search-and-follow the slick decide on optimal collection strategy loading and unloading sequences, etc…


Unit levelTwo design classes: Catamaran & MonocatThree sizes: Large – Medium – Small

Large catamaran Large monocat

Small EU-MOP


Design of catamaran EU-MOP

Main features:

Autonomy 24hEnergy production Diesel GeneratorOil recovery Folding belt skimmer + oil storage tankPropulsion 2 x Azimuthing thrustersTrim adjustment No ballasts

Large EU-MOP model

Length 3.20 mBreadth 2.30 mFore hull clearance 0.95 mDraught

0.93 mDisplacement (full-load) 3563 kg

Medium EU-MOP model

Length 3.00 mBreadth 1.88 mFore hullclearance 0.68 mDraught

0.80 mDisplacement (full-load) 2582 kg


MONOCAT - Large

Principle characteristics

LOA 3.5 mLWL 3.5 mBOA 2.3 mDepth 1.3 mFore hullclearance 1 mAir draft 3.45 m

Other features:

Autonomy 24hEnergy production Diesel GeneratorOil recovery Folding belt skimmer + 2m3 oil tankPropulsion 2 x Azimuthing thrustersTrim adjustment 2x 125l water ballastsAnti capzising volume (mast)

Design of monocat EU-MOP


MONOCAT - Large

Hydrostatics & stability (preliminary)

Displ (kg) Wetted Draft (m) surf (m²)

Lightship 1735 13.2 0.4550% Load 2730 15.6 0.60100% Load 3335 17.5 0.72

Hull Design features:

- Allows for skimmer fitting and good oil canalization.- Provides enough volume for oil storage and equipment fitting.- Minimize drag.- Minimised change in draft with increasing loading. - Centre of volume located slightly aft for minimizing trim with increasing loading.



MONOCAT - Medium

Principle characteristics

LOA 2.4 mLWL 2.4 mBOA 1.9 m Depth 1.10 mFore hull clearance 0.7 mAir draft 2.13 m

Other features:

Autonomy 24hEnergy production Diesel GeneratorOil recovery Folding belt skimmer +

1.4 m3 oil tankPropulsion 2 x Azimuthing thrustersTrim adjustment 2x 90l water ballastsAnti capzising volume (mast)



MONOCAT - Medium

Hydrostatics & stability

Displ (kg) Wetted Draft (m) surf (m²)

Lightship 1180 8.4 0.4850% Load 1750 9.8 0.65100% Load 2280 12.4 0.80

Hull Design features:

Parametric scaling from Large unit’s Hull with specific targets:-Length constrained by 40’ container size-Increased freeboard / Length ratio-Increased Breadth / Length ratio



Design of small EU-MOP

DimensionsLOA: 1.20 m - BOA: 1.10 m - Depth: 0.7 mMax speed: 3 kts - recovery speed: 0.7 kts

Energy systemBattery pack type: LiFePO

Propulsion system2 x fthrustersTo be determined

Small Unit - presentationOil tank capacity: 0.19 m3

Skimmer typeRo Clean – DBD 5Single bank of 10 discs – 295 mm DiameterRecovery capacity (max): 5-7 tonnes / hr


Unit design: propulsion resistance

EU-MOP Novel Designs

No documented resistance correlations

Accurate estimation Towing tank model tests

Study of oil/emulsion effects CFD simulations

Speed (Knots)

Catamaran Monocat

Resistance (N) Eff power (W) Resistance (N) Eff power (W)

1 49 25 18 9

2 186 192 69 70

3 520 806 185 283

4 1138 2333 396 810

5 2217 5654 1010 2585


Fouling and oil-layer simulations

5 cm

Vis

cosi

ty in

crease

900%

Resistance increase 21.5%

Estimate the resistance increase when:Navigating through floating oil film of 5 cm


Unit design: energy source

EU-MOP Power (kW)

Selection

Catamaran Monocat

Large

Propulsion

- 2xSeaEye SM7

2xDSSI 2100 (SEA MAX TH-

2100)

Total - 5.0 kW 3.0 kW

Medium

Propulsion

- 1xKOHLER 8EOZD

2xDSSI 2100 (SEA MAX TH-

2100)

Total - 8 kW 1.5 kW

Small

Propulsion

1 ? ?

Total 1.87 ? ?


Unit design: propulsion & steering

Connection to Propulsion MotorConnection to Propulsion Motor

Teflon Face

Sealed Thrust Race

Grub Screw

Bearing Retention Ring

Locking Screw

Steering Drive Shaft

Needle Bearing


Unit design: large catamaran manoeuvring

Effect of SpeedEffect of Speed

Effect of Loading ConditionEffect of Loading Condition60 NDA

-0.5

0

0.5

1

1.5

2

2.5

3

3.5

4

-1 -0.5 0 0.5 1 1.5 2 2.5 3 3.5

X/L

Y/L

0.50 knots Full2.00 knots Full0.50 knots Light2.00 knots Light

Loading Condition: Unloaded + %10 Fuel

-0.5

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

-1 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 4

X/L

Y/L

0.50 knots 60 NDA2.00 knots 60 NDA5.00 knots 60 NDA

Loading Condition: Fully Loaded

-0.5

0

0.5

1

1.5

2

2.5

3

3.5

4

-1.5 -1 -0.5 0 0.5 1 1.5 2 2.5 3 3.5

X/L

Y/L

0.25 knots 60 NDA0.50 knots 60 NDA1.00 knots 60 NDA2.00 knots 60 NDA5.00 knots 60 NDA

NDA: Nozzle Deflection Angle (°)

Effect of Nozzle Deflection AngleEffect of Nozzle Deflection Angle

Loading Condition: Fully Loaded

0

1

2

3

4

5

6

7

-3 -2 -1 0 1 2 3 4 5

X/L

Y/L

2 knots 35 NDA2 knots 60 NDA

5 knots 35 NDA5 knots 60 NDA


Unit design: Artificial Intelligence

Controls and sensors DGPS Obstacle detection / collision avoidance system Depth sensor Compass Oil-in water sensor Level indicators for fuel & storage tanks Radio-based communication system Embedded control processor/computer


EU-MOP storage/logistics

Catamaran Monocat

Container Large Medium Large Medium

40ft 3 4 3 5

20ft 1 1 1 2


Outlook and Future Challenges

The EU-MOP system presents us with a series ofunique features in terms of versatility, scalability,efficiency and user-friendliness.

The EU-MOP project has produced a preliminarydesign that spans the system-to-unit range andsets the ground for further development of theconcept.

The ground is ripe for moving to the next stage:finalising a prototype design and runningtesting to demonstrate the advanced featuresof the EU-MOP concept.

integrated eu-mop system design

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