general introduction on azipod

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Presentation

2008-11-21 VMH Isko Kuha

ABB Oy, Marine & Turbocharging

General Introductionon Azipod®

Isko Kuha

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Contents

General on Azipod

Design process

Shipyard installation

On technicalproperties

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The definition

The Azipod (Azimuthing Podded Drive) is a podded electricmain propulsion and steering device driving a fixed pitch propeller (FPP) at a variable rpm.

The pod is azimuthing(steering around its vertical axis) infinitely by 360 degrees and is available for propeller power ratings of up to 25 MW each.

The Azipod propulsion system is optimized to preferentially use a pulling propeller(called a “tractor” type Azipod)

(Example of a 17.6 MWpassenger shippropulsion module)

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Azipod main types

Large AzipodPower up to 25MW

Passenger ferries & cruise vessels

Ice-going vessels

Low speed operation vessels, DP vessels

CRP-AzipodPower up to 25MW

Ocean-going cargo ships

Top speed operation vessels

Less manoeuvring in operation

Compact AzipodPower less than 5MW

Offshore vessels

Low propulsion power

Low speed operation

vessels, DP vessels

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Large Azipod, propeller power range and rpm

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1987 Original Azipod Idea1989 Prototype installation “Seili” 1 500 kW

1994 1st Icebreaker application “Röthelstein” 2 x 560 kW

1995 1st Cruise Vessel application, “Elation” 2 x 14 000 kW

1998 1st mounting block installation, 1st Azipod with fin, “Europa”.

1999 1st fixi-pod installation, “Voyager of the Seas”

2000 Compact Azipod introduction

1st Compact Azipod installation, 2001 Offshore supply vessel UT 745,

1st tacholess installation

2001 CRP Azipod introduction

Nov. 2008 4 200 000 cumulative Azipod operating hours

Azipod propulsion history

1993 Full size Large Azipod®: “Uikku”- 11,4 MW

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Propulsion Module

Steering Module

1 Hydraulic Power Unit (HPU)

1 Cooling Air Unit (CAU)

1 Slipring Unit (SRU)

2 Oil Treatment Units (OTU)

1 Gravity Tank (GTU)

1 Air Control Unit (ACU)

1 Azipod Interface Unit (AIU)

1 Local Backup Unit (LBU)

Azipod: 2 modules - 9 units

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Layout example - Azipod modules and units

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Contents

General on Azipod

Design process



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Getting started

The project-specific configuration of the Azipod deliverycan be easily initiated by the theory design office at the Shipyard (or by the Owners…).

Reference can be made to traditionalpropulsion and steeringsystem allocations.

Generally the Builder will needto have similar engineeringresources as for e.g. propulsionand fin stabilizer integration

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Customer integration of the Azipod delivery

1. Coordinating engineer(general purpose propulsion, steeringand outfitting)

2. Structural designer for the hullinterface (steel / scantlings’ engineer)

3. Power plant interfacer (generallypower electrical knowledge)

4. Machinery engineering/ commissioning control(Ship or mechanical engineer)

5. Automation coordinator (in charge for the ship automation interface)

6. Navigational / controls’ interface (Electronics or applied deck officer)

Several of the listed tasks may be run by the same person:

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Azipod layout: dimensions and tilt angle

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Azipod layout: mounting angle

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Slip Ring Unit(SRU)

(Pumpsand sensors)

x n

AIUBox

Fans:

x2

CoolingAir Unit(CAU)

Commandsand info

SteeringGear

Alarms(on theHPU)

Controlled power supplies

Ship

yard

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PropellerControl Unit

Ship’sMCC

Ship’sMAS

MCC status info

(Group alarm)

Azipod interface to ship automation and starters

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0 3030

6060

9090

120 120

150 150180

STBDPORT

( Example of STARBOARD turn )

”Ahead”goingship

configuration

Steering angle convention ”Ahead Going”

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180 150150

120120

9090

60 60

30 300 STBDPORT

”Astern”goingship

configuration

( Example of STARBOARD turn )

Steering angle convention ”Astern Going”

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Steering gear system layout

Separation ValveSV

Port STBD

M1Pump 2

Servo 2

M3M4M2Pump 1

Servo 1

Functionalhydraulicpiping:

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Azimuth control 1/2

Propulsion is regulated bya 4…20 mA current signalinto the Application Controller:

4 mA = Full Astern12 mA = Zero20 mA = Full Ahead

Steering is performed withan unlimited 360 degreecontrollability ona twin signal (see next slide)

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- 10 VAux.

Supply

+ 10 VAux.

Supply

Sine

Cosine

Port Stbd

TrigonometricRotation

Amidships0 V Signal ground

Portsector

Starboardsector

180 degrees0 V Signal ground

The standard control signal for steering is carried together by two trigonometric (non-linear)DC voltage signals in the samerelative galvanic potential.

These two signals are geometricallyset up at 90 degrees from each other.

The -10 V…0…+10V Sine signalfor the steering angle.0 VDC is for Amidships,and for 180 degrees.

The -10 V…0…+10V Cosine signalfor the steering angle. +10 VDC is for Amidships and -10 VDCfor 180 degrees of steering angle.

Azimuth control 2/2

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Contents

General on Azipod

Design process



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Azipod installation

Shipyard interface for the Steering Module

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Azipod installation

Steering Module being lowered into place

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Azipod installation

Azipod roomoverview with theCooling Air Unit(CAU)already fitted

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Steering with Azipod

The Rudder:progressive around Midships

The Azipod:linear around Midships

Sufficient lateral area (dead wood)to be secured at aft ship.

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Side force comparison: rudder vs. Azipod

Azipod will give thrustto any direction

as requiredby the operator

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Different operational states of ship handling

Open SeaTransit

Channelling Manoeuvring

The efficient operational routines runby the OOW should take into accountthe following important aspects:

1. Understanding the full potentialof Azipod ship handling capabilities

2. Defined interfaces to external systems(autopilot, bow thrusters, chart displays)

3. Proper transition fromone operational stateto another

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5° steering angle 25° steering angle

Azipod

Azipod

Rudder

Rudder

Comparison of turning circles

general introduction on azipod

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