Page 15: of Maritime Reporter Magazine (December 2018)

Figure 4: proposal under investigation for the presentation of the seakeeping results in a more “understandable” way

Figure 5: RAO of pitch response for different radii of inertia (kyy) for the upper most hull of ? gure 5 (H = 180 deg, Hs = 3.0 m, Vs = 12 kn)

In a world that brings pretty much anything to you at the press of an app, we are often asked why it is so dif- ? cult to assess comfort onboard a yacht.

That the assessment of comfort onboard is not an easy task is also shown by the fact that there is no industry standard as yet. This problem has already been identi- ? ed by the International Organization for Standardiza- tion and a new working group (ISO (TC8/SC12/WG 5 AWI 22834) led by MARIN is aiming to develop a comfort standard for yachts in the next three years.

ISO Comfort standard

On a parallel track, MARIN has initiated the dedicat- ed Joint Industry Project “Comfort”, which will devel- op tools, and obtain and analyse data related to comfort levels. This JIP aims to obtain comfort criteria that not only give a numerical value but also include the human

Figure 6: Hull forms used to evaluate the in? uence interpretation of this comfort level. These criteria can of a bow shape on the general seakeeping then be applied when designing new ships. behaviour of a yacht

After many years of research we know that a ship’s size does matter (the bigger the better), that the longitu- Stabilisation systems have become the “most dinal weight distribution (? gure 4) plays a more impor- wanted” system onboard, but which one is the tant role than the shape of the bow (? gure 5), and that most suitable one for a speci? c yacht? Despite men and women react to the same stimuli in different the fact that we are able to numerically and ways and that this changes with age. We also under- experimentally reply to these questions, we stand that the most “comfortable” area is often located recognise that certain concepts need further at a third of the ship’s length from the stern. explanation and research.

We feel it is our duty to keep researching

New frontier the contributions of ship motions and ac-

There is more understanding about the important role celerations. As mentioned, we have already the ship’s parameters play and about which actions the launched the Comfort JIP and as a “teaser” we captain should take to make the yacht more comfort- have started to develop an application named able. The new frontier of MARIN’s research is combin- “Comfort Mate”, which will become available ing our hydrodynamic knowledge with active control to all participants. Contact us when you would systems and onboard advisory tools to assist with the like to participate in our research to achieve comfortable operation of a yacht. optimal comfort at sea. www.marinelink.com 15

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