editorial


6 CoVadem: big data for smarter inland shipping CoVadem brings together more than 50 shipowners, MARIN, Deltares, Bureau


Telematica Binnenvaart and Autena Marine. This unique initiative makes it possible to obtain a huge databank of ship measurements.


10 Wave buoy measurements on a hexapod New hexapod is a useful tool to assess the efficiency of anti-roll tanks, sloshing in


LNG tanks, or for drop tests with a free-fall lifeboat from a moving platform.


11 New C-DRONE - for undisturbed wave spectrum measurements During trials the correct measurement of metocean conditions is crucial. MARIN


believes its new C-DRONE makes it much easier to obtain accurate measurement data.


12 Ready for the future with MMS2 Upgraded MARIN Measurement System 2 represents significant improvements.


13 Measurement System 2 deployed for BreaKin JIP tests BreaKin JIP gains more insight into the scale effects involved in wave-in-deck model


tests and links wave kinematics with impact loads.


14 Capturing the invisible High-speed video allows us to capture processes that are not visible to the naked eye.


16 Optical measurement techniques lead to highly accurate deformation measurements Optical measurement techniques are becoming more and more important for our customers.


18 6-component propeller blade/shaft force and moment balance provides important insight MARIN designs podded propulsor model with an internal motor and a rotating 6-component force and moment shaft balance, which is being used in a wide range of projects from exploring ice loads on propeller blades to the effects of cavitation.


20 Supporting silent ships Measuring underwater radiated noise from cavitating ship propellers.


22 Quantifying measurement uncertainty Integrating uncertainty analysis in the measurement chain.


23 Stereo Particle Image Velocimetry proves an important tool in a wide range of test campaigns An overview of the use of PIV over the years.


24 Exploring the mysteries of the human factor MARIN’s overriding aim is to increase the safety and effectiveness of maritime


operations. This is why we have extended our hydrodynamic and nautical expertise with the addition of the human factor.


26 How to determine weight distribution? Accurate modelling of the predetermined weight distribution is of crucial importance.


‘Resonic F’ has the answers.


27 Propulsion tests: quasi-steady for efficiency and quality Report explains why the quasi-steady approach is gradually replacing the


conventional method in model propulsion tests.


Bas Buchner President


report 3 Dear Reader,


A special edition on ‘Measurements and Visualisation’ in the magazine of a research institute - Isn’t that like the carpenter promoting his saw, or the baker proudly showing his oven? Yes and no. Despite the fact that a carpenter cannot work with a blunt saw and the baker needs the best oven to bake tasty bread, there is more to it. Measurements are close to the heart of MARIN’s activities: without measurements we cannot research and without measurements we cannot advise.


This is true now, but it will also be like this in the future. We are definitely in a transition, gradually replacing more simple model tests with computational methods such as CFD. Future model tests will therefore focus on the complex issues. It is exactly this development that requires an emphasis on the complexity, detail and accuracy of our measurements, during both the validation of the CFD methods for certain applications, as well as for a check on the final result.


So this is a special edition on ‘Measurements and Visualisation’ in the digital age. And these developments go fast. For a long time, MARIN’s measurement options were limited to strain gauges, accelerometers, mechanical gyros and analog optical systems. But now fibre optics, high-speed video, stereo Particle Image Velocimetry (PIV), optical deformation measurements and miniaturised electronic gyros and accelerometers are available. They enable more accurate measurements and developments such as small, fast wireless models.


When it comes to visualisation huge steps are also being made. Because we were used to quasi-static, stroboscopic images, high-speed video really opened our eyes concerning the actual development of the cavity in time and space. And there is much more to explore when we are better able to combine measurements and visualisation.


Reasons enough for this special issue. I hope you enjoy!


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