A partnership based on thrust – MARIN’s relationship with Royal Netherlands Navy goes from strength to strength

A/ARIN's relationship with Royal Netherlands

Navy

goes

from strength to strength

A partnership

based

on trust

MARIN's relationship with the Royal Netherlands

I

Navy and the Defence Materiel Organisation (DM0)

is one that spans decades and it is one that looks

set to intensify in the future. Report interviews

I

Jaap Hui.srnan, head of DMO's design office about

the partnership.

Deift University of Technology

Ship Hydromechanics Laboratory

Library

Mekelweg 2

2628 CD Deift

Phone: +31 (0)15 2786873

E-mail: p.w.deheer@tudelft.nl

Mr

Huisman personally, has also had a long relationship with

MARIN because he briefly

worked there back in 1974 whilst studying to become a naval architect at Delft University. Over the years he has been a

regular visitor to MARINs Wageningen

headquarters.

From the New Year Mr Huisman expects to again be working closely with MARIN as

he takes on a new role as head of platform systems, which includes hydrodynamics. Mr Huisman is very keen to stress that the navy unit of the DM0 is not typical of simi-lar organisations in other countries because it is not just about procurement. The DM0 has its own design offices, he says. "We still design our own concepts for ships, they go for tests at MARIN and then they are engineered and built by Dutch yards." It is therefore essential to keep naval design expertise available in the Netherlands within industry, defence organisations and

especially at knowledge centres like MARIN,

he says. "The real specific in-depth, hydro-dynamic expertise lies with organisations

such as MARIN. We are actually brokers of

that knowledge."

One advantage of working with MARIN is

that the DM0 can give feedback from the

naval fleet so that both the MARIN and 0MO

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naval architects can work together. There are many synergies between MARIN and the navy, he adds.

Currently, the two organisations are work-ing on several surface ship and submarine projects. Eelco Harmsen, the point of contact

between the DM0 and MARIN for surface

ships, says that essentially the combination provides a knowledge centre, a centre of excellence in the Netherlands.

LCF frigate on the sound range

RHIB deploytrierrt test or patroi vessel

14 report

Due to the fact that the 0MO can provide

feedback for MARIN from full-scale trials

this also helps further development. Dutch frigates for instance, are perhaps the quietest in the world, he points out, especially from the propeller point of view.

Propulsive research At the moment

several navies are working on R&D for

advanced propulsion designs for surface combatants, particularly focusing

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on cavitation and propeller noise during combat operations. 'Now we are trying to find a more tolerant design when the sea conditions are changing, taking into accou

ships' motions and dynamics."

MARIN and DM0 started on the propulsive

research years ago, looking at different combinations - conventional shafts, pods and waterjets. The research is currently focusing on waterjets and understanding the physics. "This involves looking at it in a completely new way and this is new

for MARIN as well," he says. "It is a

learning curve for both of us." A combina-tion of model testing and CFD calculacombina-tions are being used and the navy and MARIN are exploring the benefits of CPD calcula-Pons in the initial design process. Researcl is expected to take at least another six years.

The DM0 stresses that it is important for MARIN to have both a knowledgeable and

critical client. It can then give MARIN feed

back as soon as possible when testing is underway, especially with seakeeping trials. This means the validation process is

speeded up and it is possible to see whid

seakeeping and manoeuvring criteria affec the mission.

Submarines Another important area

where the two organisations team-up concerns submarine technology. Pieter var Coevorden, who heads up projects for subsea technology, says currently they ar addressing the changing operational profL

of the submarine. "Submarines were designed for open oceans but they are no' being deployed close to the shore."

Model testing is being carried out at MARI

for submarines that travel near to the sea-bed and examining how this close proxim affects the manoeuvring characteristics. TI

end-goal is to develop a simulation code t1

could formulate predictions which could then be used by submariners to give then operational guidance. Here, the navy pro-vides guidance from its submarine service

fr van Coevorden also stresses that it is ital to keep the knowledge gained from

ie navy and MARIN in the Netherlands for

ie future. The research helps fill the nowledge gaps because obviously, ships re not ordered every day so this testing eeps them up to date with the very latest

chnologies. New CFD tools are being

eveloped and combined with the testing

ssults.

everal navies and MARIN are also working

)gether in the submarine sector. Recently, Free Running Model has been developed nd this has been tested at MARIN. Only a

w organisations in Europe have the

facili-es for tfacili-esting such a model and MARIN is rie of them.

RNavïes Another area where both the

utch navy and MARIN work together is ooperative Research Navies. "This is a very

nportant international community and elps to build up hydrodynamic knowledge nd it helps us to understand the stability f damaged ships for instance."

MARIN has been involved in the

develop-ment of four patrol ships that are being

built at Damen Schelde Naval Shipbuilding.

The first keel-laying just took place and the vessels will be delivered between 20

10-20 12. MARIN helped with the design of the

slipway for the high-speed interceptors and hull form, the final design and the speed

trials were conducted at MARIN. A Joint

Support Ship is also being developed. Here, MARIN has assisted with the hull form and propeller design.

In the future, Mr Huisman is certain that

MARIN and the DM0 will work together

even more intensively. 'After 2015 the fact that the world is warming up will be an important factor. As the ice melts and the hunt for oil starts to get underway in un-explored areas, specific design requirements will be challenged. One area of interest concerns unmanned vessels operating below the surface."

a producer of advanced design tools. Qnowiedge has developed an integrated design tool that can generate and analyse Ship concepts and compare them very

quickly.

MARIN is of course, very well known for

model testing but Mr Huisman would also

hope that MARIN could even take on more

design office functions and become "more of a partner in design in the future". The DM0 underlines that the crucial thing about the relationship is that it is based on

trust. "We trust MARIN," says Mr Huisman.

There is very good interaction, very short lines of communication and people know each other personally. Ideas can quickly get into the water."

The DM0 is particularly interested in MARINs

recent integration of the Qnowledge team,

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Figure C Naval Combatant 5415 16 report I I I I I I I I I I I I I I I I I I I I I I .\kJ?j%7 \% _________

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New unstationary test

techniques in the MARIN basin

To determine mathematical models, Planar

Motion Mechanism (PMM) and rotating arm

tests have traditionally been used but

with the introduction of the Computerised

Planar Motion Carriage (CPMC) 30 years

ago, flexibility was added. The installation

of a CPMC over a very large basin such as

MARIN's Seakeeping and Manoeuvring

Basin ac.ds even more flexibility. And now

new, unstationary CPMC tests have been

introduced. A recent campaign on the "naval

combatant 5415" has been carried out

deploying the new tests, which aim to

reduce testing time and costs.

Rink Hailmann & Frans Quadvlieg tquadvlieg@marin.nl

The

has been model tested at variousnaval comlmtant 5415 (see figure 1

institutes in the world. As seen, the model is a typical naval surface ship. At MARIN, this ship is used to carry out Free Running Manoeuvring tests, PMM tests,

rotating arm tests, but also the new types

of unstationary CPMC tests.

New techniques

The aim of the new testing techniques is tc reduce the testing time and hence, improvE efficiency and reduce the costs of captive model test campaigns. Usually, these mode test campaigns are used when customers

require detailed mathematical models. These mathematical models may be

neces-sary for fast-time, or real-time simulator

studies, The objective of these studies is tha a mathematical model can be constructed

out of a range of measured comitinations of

drift angles, rotation rates, rudder angles an

propeller revolutions.

Unstationary tests

Now, how does it work? In traditional captti

tests, each run consists of one combinatior of drift angle, rotation rate, rudder angle, ship speed and propeller RPM. Each run lasts long enough to get a good answer. In