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Ikeda Revisited
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. Wallenius Marine AB.
KTH, School of Engineering Sciences (SCI).ORCID iD: 0000-0002-8343-5098
Wallenius Marine AB.
2017 (English)In: Journal of Marine Science and Technology, ISSN 0948-4280, E-ISSN 1437-8213Article in journal (Refereed) Submitted
Abstract [en]

In this paper Ikeda’s method for roll damping prediction is revisited and the applicability of the method to modern volume carriers is considered. For volume carriers the hull lift and bilge keel components are the dominating components and the estimation of these components in the original method are benchmarked and scrutinized. It is concluded that the speed dependence of the bilge keels damping is underestimated by the original method. This is partially explained by that Ikeda seems to have underestimated the lift force of the bilge keels in his analytical expressions. Correcting for this and taking account of the lift force generated pressure on the hull surface gives overall better agreement with model tests. It is also concluded that the hull lift damping component is significantly overestimated with the original method. Non-viscid CFD is used to propose a new generic expression for estimating the lift coefficients for volume carriers which greatly improve the accuracy in comparison to model test results. With these improvements Ikeda’s method is revitalized and the applicability is extended to unconventional volume carriers.

Place, publisher, year, edition, pages
Springer, 2017.
Keywords [en]
Ikeda´s method, roll damping, CFD, model tests, bilge keels, hull lift, volume carrier
National Category
Engineering and Technology Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-207133OAI: oai:DiVA.org:kth-207133DiVA, id: diva2:1096064
Funder
The Swedish Mercantile Marine Foundation
Note

QC 20170517

Available from: 2017-05-16 Created: 2017-05-16 Last updated: 2017-05-17Bibliographically approved
In thesis
1. Controlling the Roll Responses of Volume Carriers
Open this publication in new window or tab >>Controlling the Roll Responses of Volume Carriers
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Modern volume carriers such as container vessels, cruise ships and Pure Car and Truck Carriers (PCTC’s) have become more vulnerable to critical roll responses as built in margins have been traded against increased transport efficiency. The research presented in this doctoral thesis aims at enhancing the predictability and control of these critical roll responses. The thesis presents a holistic framework for predicting and assessing the roll damping, which is a crucial parameter for predicting roll motions, based on a unique combination of full scale trials, model tests, semi-empirical methods and computational fluid dynamics. The framework is intended to be used from the early design stage and gradually improved until delivery of the ship and finally to provide input for decision support in the operation. The thesis also includes a demonstration of a new application for rudder control to be used for mitigation of parametric roll. This is performed by simulating real incidents that have occurred with PCTC’s in service. Simulations with rudder roll control show promising results and reveal that the approach could be very efficient for mitigation of parametric roll. Finally, an approach for monitoring of roll induced stresses, so-called racking stresses in PCTC’s, is presented. The approach involves measurement of the ship motions and scaling of pre-calculated structural responses from global finite element analysis. Based on full scale motion and stress measurements from a PCTC in-service the approach is evaluated and demonstrated to be an efficient alternative to conventional methods.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. p. 24
Series
TRITA-AVE, ISSN 1651-7660 ; 2017-22
Keywords
PCTC, parametric roll, roll response, roll damping, rudder control, aerodynamic roll damping, roll mitigation, racking, Ikeda’s method, CFD, model tests, Full-scale tests
National Category
Engineering and Technology
Research subject
Vehicle and Maritime Engineering
Identifiers
urn:nbn:se:kth:diva-207125 (URN)978-91-7729-340-8 (ISBN)
Public defence
2017-05-05, Sal F3, Lindstedtsvägen 26, Stockholm, 14:51 (English)
Opponent
Supervisors
Funder
The Swedish Mercantile Marine Foundation
Note

QC 20170516

Available from: 2017-05-17 Created: 2017-05-16 Last updated: 2017-05-17Bibliographically approved

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