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Motion-based monitoring of racking stresses in ro-ro ships
Wallenius AB.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Naval Systems. (Centre for Naval Architecture)ORCID iD: 0000-0002-8343-5098
Seaware AB.
2012 (English)In: Ships and Offshore Structures, ISSN 1744-5302, E-ISSN 1754-212X, Vol. 7, no 4, 389-398 p.Article in journal (Refereed) Published
Abstract [en]

This paper presents a method for monitoring of racking-induced stresses in ro-ro ships. The approach is built on the assumption that the racking stresses are mainly induced by the roll and sway motions and therewith related inertia and gravity forces. The approach involves real-time measurement of the ship motions and scaling of the measured motions with pre-calculated structural responses from finite element analysis. The method is applied to full-scale measurement data from the Wallenius Lines PCTC Mignon. Derived stresses show good agreement with stresses derived from strain gauge measurements, indicating that the method has potential as an alternative to conventional strain-gauge-based monitoring. Motion-based stress monitoring has several potential areas of application such as providing data for decision support, for live assistance and short-term route planning, structural condition reports and for supplying feedback to the design process.

Place, publisher, year, edition, pages
2012. Vol. 7, no 4, 389-398 p.
Keyword [en]
racking, hull response monitoring, full-scale measurements, finite element analysis, ro-ro ships, PCTC
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-73230DOI: 10.1080/17445302.2011.594297ISI: 000311945700004Scopus ID: 2-s2.0-84870918544OAI: oai:DiVA.org:kth-73230DiVA: diva2:488683
Note

QC 20120202. Available online: 07 Jul 2011

Available from: 2012-02-02 Created: 2012-02-02 Last updated: 2017-12-08Bibliographically approved
In thesis
1. Controlling the Roll Responses of PCTC's
Open this publication in new window or tab >>Controlling the Roll Responses of PCTC's
2013 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Modern Panamax Pure Car and Truck Carriers (PCTC) have become more vulnerable to critical roll responses as built in margins have been traded against increased transport efficiency. The research presented in this licentiate thesis aims at enhancing the predictability and control of these critical roll responses. The thesis presents the development of a new method for assessing the roll damping, which is a crucial parameter for predicting roll motions. The method involves a unique set up of full scale in-service trials and is straightforward, cost efficient and shows a good potential. 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. Last but not least 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, 2013. xiii, 14 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2013:18
Keyword
PCTC, parametric roll, roll response, roll damping, rudder control, roll mitigation, racking
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-121207 (URN)978-91-7501-734-1 (ISBN)
Presentation
2013-05-13, E31, Lindstedtsvägen 3, ½ tr, Kungl Tekniska högskolan, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20130424

Available from: 2013-04-24 Created: 2013-04-23 Last updated: 2013-04-24Bibliographically approved
2. 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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