General information
The well being of passengers and the crew on board of vessels is often referred to as comfort.
A key factor in the mobility of passengers and crew is the combined effect of vertical and transverse accelerations. The " gravity angle" is a good measure for the ability to walk or climb a stairway and the feasilibility of handling heavy gear (mobility is often expressed in terms of EGA=effective gravity angle and MII=motions induced interruptions).
According to the literature (e.g. Nordforsk) the vertical accelerations are a prime reason for seasickness. On board investigation and recent work suggests that also other and combined modes of motion play an important role (seasickness and fatigue are often expressed in terms of vertical accelerations, MSI=motion sichness incidence and combined MSI).
Apart from direct wave induced shipmotions, (hull girder) vibrations and noice due to slamming are very important comfort issues.
The well being of passengers and the crew on board of vessels is often referred to as comfort.
A key factor in the mobility of passengers and crew is the combined effect of vertical and transverse accelerations. The " gravity angle" is a good measure for the ability to walk or climb a stairway and the feasilibility of handling heavy gear (mobility is often expressed in terms of EGA=effective gravity angle and MII=motions induced interruptions).
According to the literature (e.g. Nordforsk) the vertical accelerations are a prime reason for seasickness. On board investigation and recent work suggests that also other and combined modes of motion play an important role (seasickness and fatigue are often expressed in terms of vertical accelerations, MSI=motion sichness incidence and combined MSI).
Apart from direct wave induced shipmotions, (hull girder) vibrations and noice due to slamming are very important comfort issues.
Services & Activities
MARIN often offers information about the well being of the passengers and crew in relation to ship motions. In a preliminary design stage the ship motions and comfort levels can be calculated for different ships in a arbitrary sea condition and for a specific locations of interest on the vessel (e.g. dining room). In scenario simulation furthermore the number of occurances can be simulated that comfort levels are below a certain level during a number of years on the route the vessel is going to operate.
In the Seakeeping and Manoeuvring basin shipmotions are measured as well as the slamming and whipping loads due to impacts of the bow or stern with the waves. Clearly comfort is of a large importance on board of cruise vessels, Ferries and yachts. But also on board of merchant and navy vessels the well being of the crew is of growing importance.
Noise and vibration issues are being dealt with by the Ships knowledge group propulsors and cavitation. Cavitation calculations and tests in our depressurised towing tank together with hull pressure measurments indicate the likelyhood of excessive vibrations or cavitation noise due to the operating propeller.
The Trials and Monitoring Department is involved in full-scale measurement of vessel motions and noise and vibration measurements.
MARIN often offers information about the well being of the passengers and crew in relation to ship motions. In a preliminary design stage the ship motions and comfort levels can be calculated for different ships in a arbitrary sea condition and for a specific locations of interest on the vessel (e.g. dining room). In scenario simulation furthermore the number of occurances can be simulated that comfort levels are below a certain level during a number of years on the route the vessel is going to operate.
In the Seakeeping and Manoeuvring basin shipmotions are measured as well as the slamming and whipping loads due to impacts of the bow or stern with the waves. Clearly comfort is of a large importance on board of cruise vessels, Ferries and yachts. But also on board of merchant and navy vessels the well being of the crew is of growing importance.
Noise and vibration issues are being dealt with by the Ships knowledge group propulsors and cavitation. Cavitation calculations and tests in our depressurised towing tank together with hull pressure measurments indicate the likelyhood of excessive vibrations or cavitation noise due to the operating propeller.
The Trials and Monitoring Department is involved in full-scale measurement of vessel motions and noise and vibration measurements.
Facilities & Tools
Comfort issues could be assessed by the following tools:
Comfort issues could be assessed by the following tools:
SHIPMO: Motions and seakeeping of ships
WASCO: Workability analysis of ships and constructions offshore
GULLIVER, a ship designers’ edge
WASCO: Workability analysis of ships and constructions offshore
GULLIVER, a ship designers’ edge
Experience
Comfort issues are assessed in all our projects concerning yachts, cruise vessels and ferries.
The following Joint Industry Project (JIPs) were focussed on comfort:
Comfort issues are assessed in all our projects concerning yachts, cruise vessels and ferries.
The following Joint Industry Project (JIPs) were focussed on comfort:
- COMPASS (development of a new motion sickness prediction model and realistic standards for Motion Sickness and Passenger Comfort)
Most recent Papers about Comfort presented by MARIN:
(complete overview of papers can be found under Publications)
(complete overview of papers can be found under Publications)
Cruise ship seakeeping and passenger comfort
R.P. Dallinga and J.E. Bos, HPAS 2010, 2010
The partial cavity on a 2D foil revisited
Hoekstra, M. and Vaz, G., CAV2009, 2009
Modeling and analysis of a cavitating vortex in 2D unsteady viscous flow
Bosschers, J. , CAV2009 7th International Symposium on Cavitation, 2009
Similarity solutions for viscous cavitating vortices
Bosschers, J., Janssen, B. and Hoeijmakers, H., Journal of Hydrodynamics, 2008
Advanced and future hydrodynamic optimisation tools in sail yacht design
Ridder de E.J. and Gaillarde G., MDY Madrid Design Yacht 06, 2006
R.P. Dallinga and J.E. Bos, HPAS 2010, 2010
The partial cavity on a 2D foil revisited
Hoekstra, M. and Vaz, G., CAV2009, 2009
Modeling and analysis of a cavitating vortex in 2D unsteady viscous flow
Bosschers, J. , CAV2009 7th International Symposium on Cavitation, 2009
Similarity solutions for viscous cavitating vortices
Bosschers, J., Janssen, B. and Hoeijmakers, H., Journal of Hydrodynamics, 2008
Advanced and future hydrodynamic optimisation tools in sail yacht design
Ridder de E.J. and Gaillarde G., MDY Madrid Design Yacht 06, 2006
Most recent Articles about Comfort written for MARIN Report:
(complete overview of articles can be found under Publications)
(complete overview of articles can be found under Publications)
Measuring success
MARIN Report, 2009
Oasis of the Seas
Giedo Loeff, Jaap van Heerd & Reint Dallinga, MARIN report, 2009
PROCAL beats the panel!
Johan Bosschers, MARIN Report, 2007
Five decades of innovation and a great future
Jaap van Heerd, MARIN Report, 2007
MARIN answers increasing demand
Frans van Walree & Frans Quadvlieg, MARIN Report, 2007
MARIN Report, 2009
Oasis of the Seas
Giedo Loeff, Jaap van Heerd & Reint Dallinga, MARIN report, 2009
PROCAL beats the panel!
Johan Bosschers, MARIN Report, 2007
Five decades of innovation and a great future
Jaap van Heerd, MARIN Report, 2007
MARIN answers increasing demand
Frans van Walree & Frans Quadvlieg, MARIN Report, 2007
Contact
For more information on how MARIN can help your organisation with comfort issues, please contact the Seakeeping knowledge group at seakeeping@marin.nl or one of the specialised teams in the ships department that is dedicated to your type of vessel.
For more information on how MARIN can help your organisation with comfort issues, please contact the Seakeeping knowledge group at seakeeping@marin.nl or one of the specialised teams in the ships department that is dedicated to your type of vessel.