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Minehunter

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by

Luis winters

on 13 June 2015

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Transcript of Minehunter

Chance of clogging
More expensive
Less efficient at low speeds
Good maneuverability
Little vibrations
Selection based on Multi-Criteria Analysis
Several weighted criteria used
Acoustics
Draft
Magnetic signature
Fuel efficiency
Power
Complexity
Maintenance
Stationkeeping
Maneuverability
Availability spare parts
Costs

A vessel specifically designed to actively detect and destroy mines


Tiemen hartmans - 4024486
Folkert Kool - 1393081
Luís Winters - 4042115
Hans Limburg - 1544748
OE4623 Drive Systems design principles
Introduction
Propulsion system
Concept Selection
Chosen concept
Specifications
Content
Propulsion system
Energy source
Energy transfer
Propulsion

Energy Source
Gas Turbine
Combustion engine
Nuclear reactor
Steamturbine
Gas Turbine
Combustion engine
Simple and reliable
Multiple energy sources possible
Direct transmission possible
Efficient at low RPMs
Heavy engine
Less efficient at high RPM
Efficient energy source
Relatively light weight
Reliable
Cannot deliver direct transmission
Used often by navys
Diesel
Nuclear reactor
Readily available
High RPM range
Torque
Readily available
Cheap
Turbo possible



Crude oil
LNG
No refueling required
High energy density
Possibly dangerous
Heavy
Steam Turbine
Gasoline
Efficient
Reliable
Direct transmission possible
Steam must be supplied
Not achievable and not further evaluated:

Wind enery
Solar energy
Thermal energy
Energy transfer
Special requirements minehunter
Mechanical propulsion
Electrical propulsion
Hydraulic propulsion

Mechanical propulsion
Efficient at low speeds
Relatively light
Does not fulfill the acoustic requirements
Does not work with all propulsion systems
Noise
Hydraulic propulsion
Simple and reliable
Several options as energy source
Direct propulsion
High efficiency at low rpm
Low efficiency at high rpm
Engine is heavy
Electrical propulsion
Efficient
reliable
Electricity is easy generated
Propulsion speed and direction is easily adjusted
Little noise
Environmental friendly
Special requirements
Little vibrations
Small acoustic signature
Station keeping
Introduction
Goal
Project scope
Requirements
Goal
Selection en optimalization of a propulsion system applied to an offshore application
Project scope:
Minehunter
Sea mine
Type of ship
Relatively small
Manoeuvrable
Composites
Mine types
- Contact mines
- Influence mines
Magnetic mines
Acoustic mines
Pressure mines
- Explosive
- Disrupting & blocking sea routes, harbor areas and canals
- active over long periods
Destruction
Controlled detonation
Towing cable
Explosive or deck gun
Triggering due to magnetism
Triggering due to vibrations


Working principle
- Sensor
- Detonation mechanism

Detection & Identification
- Sonar
- ROV & Divers
Latest
developments
Requirements
Trimaran hull
Fast
Stable platform
Small accoustic signature
Low pressure build up around hull

Specific requirements
General requirements
Costs
Hull space
Specific Requirements

Based on purpose
Minimalising risk of detonation
Small draft
Small pressure build up around hull
Small accoustic signature
Small magnetic signature
Precise in station keeping

Based on environment
Response time
Fuel availability
Parts availability
Reliability

Propulsion
Propeller
Waterjet
Voith Schneider
Azimuth Thrusters

Propeller
Simple and reliable
Direct transmission
Efficient propulsion
Difficult maneuvering
Waterjet
Voith Schneider
Small acoustic signature
Optimal station keeping
Direct propulsion possible
Simple and reliable

Hydrogen
Quiet
High efficiency
Environmentally friendly
Little maintenance

Expensive
Not yet proven technology
Difficult production
Fossil fuels
Easily transported
Low price per liter
Explosion danger

Azimuth Thruster
Large acoustic signature
Good station keeping
Complex system
Direct drive possible

Difficult to acquire
Heavy
Radioactive

NO CO2 emission
Reliable

Uranium or Plutonium
Heavy
Viscous
Must be kept warm
CO2 emission
Readily available
Efficient for long trips
No explosion danger
Higher quality requirements
CO2 emission
Readily available
Proven technology
CO2 - emission
expensive
charge battery
Chosen Concept
Propulsion
Energy Source
Energy Storage
Hull-shape and layout

MCA - Gas turbine
Energy Source:
Gas Turbine
Drive systems - Concepts
Consists of energy generator and propulsion:

Energy generation
Gas turbine
Reciprocating engines
Propulsion system
Azimuthing thruster
Propeller
Voith-Schneider
Waterjet
MCA - Reciprocating engine
Energy Storage
Propulsion
Selected concept
Gas turbine combined with Voith-Schneider propellers
Voith Schneider propeller
The gasturbine drives the generators
Runs at optimal RPM
Fuel flexibility
LNG
MGO (Marine Gas Oil)
Principle
behind gasturbine
The Brayton Cycle
MGO: Marine Gas Oil
Standard fuel for gasturbines
Readily available
Gasturbine requires more maintenance
MGO vs LNG
MGO
Readily available
Easily transported
Requires more maintenance
LNG
Readily available (especially in the street of Hormuz)
Clean fuel
Requires little maintenance
Fuel flexibility
Recomended Propulsion
6MW General Electrics Gasturbine
TEWAC AC generator
Performance
Assumptions:
Operational for 30min without use of the gasturbine, to avoid acoustic mines
At 1MW power requirement
Concept selection
Criteria weights
Criteria
Profile of the Voith Schneider Propeller:
Length = 300 mm
Chord Length = 150 mm
2 * 26R5/195-2
Energy Requirements
Voith Schneider: 2x3MW
Bowthruster: 1x0.8MW
Elektrical systems: 1MW
TOTAL: 8MW
Diesel
Gasoline
Required Battery Capacity
Required battery capacity: 0.5hx1MW = 500kWh
Battery capacity given in Ah and V
P(W) = I(A) x U(V) P(W)xt = I(A)xt x U(V)
Hull & layout
Chosen Battery
Intercel PBQ SC 3000 - 2: 3000 aH at 2 volt
2 x 3000 = 6kWh per battery
500/6 = ca. 80 batteries
200kg per battery 16000kg total
5 m3 required
Power & efficiency
Increasing pressure ratio most direct way
Limiting factor:
Max temperature blades can withstand
Max pressure sealing can withstand
Methods to improve efficiency
Improving pressure ratio
Recuperation
Cogeneration
Methods to improve power generation
Reheating
Overspray
Sensor
Detonation
mechanism
Detection
Contact
Vibrations
Pressure
Magnetism
Primer
Explosive

Key pro 's:
Maneuverable
Low noise
Principle
Blades move along circular path while performing a superimposed oscillating motion
Magnitude and thrust precisely contolled via this oscillating motion
1. Isentropic process - Compression
2. Isobaric process - combustion
3. Isentropic process - expansion
4. isobaric proces - heat rejection
Ship resistance approximation
Ship dimensions:
T = 2m
L = 40m
B = 8m (main floater)
Top speed:
20 kn ≈ 10 m/s

So Fn ≈ 0.5 and S ≈ 350 m
Determining resistance
Ct ≈ 0.035
So Ft ≈ 600kN

This results in a required thrust of:
Pthrust = Ft * v = 6MW
Ft=1/2 ρ∙Ct∙v^2∙S
Full transcript