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On Aerodynamical Roll Damping
Wallenius Marine AB.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Naval Systems. KTH, Superseded Departments, Aeronautical and Vehicle Engineering.ORCID iD: 0000-0002-8343-5098
Seaware AB.
2015 (English)In: Proceedings of the 12th International Conference on the Stability ofShips and Ocean Vehicles, 14-19 June 2015, Glasgow, UK., 2015Conference paper, Published paper (Refereed)
Abstract [en]

In this paper an approach for estimating aerodynamic roll damping is formulated. The approach utilizes wind tunnel tests and the concept of effective levers to relate roll induced apparent wind to a damping moment. Evaluation of the approach on a typical PCTC demonstrates that the aerodynamic damping in certain conditions can be of similar magnitude as the hydrodynamic damping when the weather is rough. The importance of considering this component in the formulation of operational guidance with respect to parametric roll is highlighted using analysis of a real incident and simplistic simulations.

Place, publisher, year, edition, pages
2015.
Keyword [en]
Roll damping, Parametric roll, Roll decay, Wind damping, Aerodynamic damping, Wind tunnel tests
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-207124OAI: oai:DiVA.org:kth-207124DiVA: diva2:1095950
Conference
Conference on the Stability of Ships and Ocean Vehicles
Funder
The Swedish Mercantile Marine Foundation
Note

QC 20170516

Available from: 2017-05-16 Created: 2017-05-16 Last updated: 2017-05-16Bibliographically 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. 24 p.
Series
TRITA-AVE, ISSN 1651-7660 ; 2017-22
Keyword
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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