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Estimation of model ice properties in ice tank operations with numerical models

von Bock und Polach, Rüdiger Ulrich Franz and Klein, Marco and Reimer, Nils and Hartmann, Moritz (2023) Estimation of model ice properties in ice tank operations with numerical models. Lulea University of Technology. International Conference on Port and Ocean Engineering under Arctic Conditions, 2023-06-12 - 2023-06-16, Glasgow, Vereinigte Königreich Großbritannien. ISSN 03766756.

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Abstract

Conducting model ice tests is still the state of the art in predicting the performance of ships and structures in ice. This is also valid for other occurrences such as waves in ice or ice feature formation processes. In an ice tank ice properties such as the flexural strengths and the thickness usually formulate the target properties towards which the ice production process is adjusted. This also means that prior to testing the properties are measured and in case target properties are not yet met additional tempering or cooling is done until target conditions are met. Conducting cantilever beam tests for the flexural strength and plate deflection tests for the elastic modulus is time consuming in the time critical ice production process. The plate deflection tests itself can take up to an hour including all preparation This paper presents a method that reduces the time needed to conduct property tests in the ice tank, while providing deeper insight into the ice properties. The first method uses a parametric finite element model, which reproduces the cantilever beam tests. With an iterative routine, the elastic or strain modulus of the ice is determined as well as the nominal stress at failure (flexural stress), the elastic stress at the root corners and the buoyancy force. Especially, the latter is in some cases of particular interest and it has been for decades under debate whether this can be read from the force recordings of the cantilever beam tests. The method increases the amount of information of the ice sheet properties significantly and reduces the time spent on ice property testing. The methods are applied and tested for different ice sheets and measurements from the Hamburg Ship Model Basin (HSVA). It is shown that the elastic modulus can be determined with a good agreement (better than 4% for regular model ice of around 30 mm thickness) to the plate deflection tests. Furthermore, the effective strain modulus and the buoyancy force is delivered as result. © 2023 Lulea University of Technology. All rights reserved.

Item URL in elib:https://elib.dlr.de/198742/
Document Type:Conference or Workshop Item (Speech)
Title:Estimation of model ice properties in ice tank operations with numerical models
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
von Bock und Polach, Rüdiger Ulrich FranzTUHHhttps://orcid.org/0000-0003-2867-7534146301411
Klein, MarcoUNSPECIFIEDhttps://orcid.org/0000-0003-2867-7534146301411
Reimer, NilsHVAUNSPECIFIEDUNSPECIFIED
Hartmann, MoritzUNSPECIFIEDhttps://orcid.org/0000-0001-7282-0399UNSPECIFIED
Date:June 2023
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Publisher:Lulea University of Technology
Series Name:Proceedings of the International Conference on Port and Ocean Engineering under Arctic Conditions, POAC
ISSN:03766756
Status:Published
Keywords:Cantilever beam tests; Experiments; Ice Tank Operations; Finite Element Modeling; Model ice
Event Title:International Conference on Port and Ocean Engineering under Arctic Conditions
Event Location:Glasgow, Vereinigte Königreich Großbritannien
Event Type:international Conference
Event Start Date:12 June 2023
Event End Date:16 June 2023
HGF - Research field:Energy
HGF - Program:Energy System Design
HGF - Program Themes:Digitalization and System Technology
DLR - Research area:Energy
DLR - Program:E SY - Energy System Technology and Analysis
DLR - Research theme (Project):E - Energy System Technology
Location: Geesthacht
Institutes and Institutions:Institute of Maritime Energy Systems
Deposited By: Klein, Marco
Deposited On:09 Nov 2023 15:31
Last Modified:24 Apr 2024 20:59

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