Statistics of Ice Loads on Inclined Marine Structures Based on Numerical Experiments

2022 ◽  
pp. 301-321
Author(s):  
Arttu Polojärvi ◽  
Janne Ranta ◽  
Jukka Tuhkuri
Keyword(s):  
Numerical Experiments ◽  
Marine Structures ◽  
Ice Loads

Ice loads on inclined marine structures - Virtual experiments on ice failure process evolution

2018 ◽  
Vol 57 ◽  
pp. 72-86 ◽  
Author(s):  
Janne Ranta ◽  
Arttu Polojärvi ◽  
Jukka Tuhkuri
Keyword(s):  
Failure Process ◽  
Marine Structures ◽  
Virtual Experiments ◽  
Ice Loads ◽  
Ice Failure

Numerical Simulations of Continuous Icebreaking Process With Different Heel Angles in Level Ice

2018 ◽  
Author(s):  
Feng Wang ◽  
Zao-Jian Zou ◽  
Hai-Peng Guo ◽  
Yi-Zhou Ren
Keyword(s):  
Measured Data ◽  
Interaction Process ◽  
Marine Structures ◽  
Structure Interaction ◽  
Ice Loads ◽  
Level Ice ◽  
Breaking Length ◽  
Increasing Trends ◽  
Ice Resistance ◽  
Good Agreement

Based on cohesive element method (CEM), the continuous icebreaking process with different heel angles in level ice are simulated in this paper. The simulations are established in FEM software LS-DYNA and an icebreaking tanker - MT Uikku is assumed advancing with the certain heel angle in level ice. Firstly, the comparisons are made between the simulations and the model tests for the cases with zero heel angle. A good agreement is obtained between the simulated and measured data. Then the effects of different heel angles on ice resistance and ice breaking patterns are investigated and analyzed. The results show that ice resistance, average ice breaking length and average broken channel width present increasing trends with the increase of ship heel angle. The applied methods show a wide prospect to predict ice loads on marine structures in the level ice and simulate the ice-structure interaction process.

Modelling Results With a New Simulator for Arctic Marine Structures - SAMS

2018 ◽  
Author(s):  
Andrei Tsarau ◽  
Marnix van den Berg ◽  
Wenjun Lu ◽  
Raed Lubbad ◽  
Sveinung Løset
Keyword(s):  
Case Studies ◽  
Offshore Structures ◽  
Scientific Models ◽  
The Arctic ◽  
High Fidelity ◽  
Marine Structures ◽  
Floating Structures ◽  
Ice Loads ◽  
Numerical Tool ◽  
Flow Effects

The Simulator for Arctic Marine Structures (SAMS) has emerged on the foundation of a number of scientific models developed at SAMCoT – Centre for Research-based Innovation - Sustainable Arctic Marine and Coastal Technology hosted by NTNU – as a versatile numerical tool for the analysis of sea ice actions and action effects on Arctic offshore structures. The current capabilities of SAMS allow engineers to analyse icefloe impacts and ice loads on arbitrary marine structures in various environmental conditions; simulations may involve both fixed and floating structures, non-rigid multi floe interactions, ice breaking and ice rubbling, wind, current and propeller-flow effects on both structures and ice. All these capabilities can be combined to model also complex marine operations in the Arctic and subarctic regions. As SAMS can be applied in both full- and model scales, a number of available experimental case studies from the field and ice tanks can be reanalysed with the new simulator to ensure the high fidelity of the simulations and to establish a validation basis. This paper presents several of such case studies and discusses further validation possibilities.

Stochastic Dynamics of Marine Structures

2009 ◽  
Author(s):  
Arvid Naess ◽  
Torgeir Moan
Keyword(s):  
Stochastic Dynamics ◽  
Marine Structures

Controllable Compliance Joint For Human Oriented Robots

2013 ◽  
Vol 43 (1) ◽  
pp. 47-60
Author(s):  
Mihail Tsveov ◽  
Dimitar Chakarov
Keyword(s):  
Numerical Experiments ◽  
Position Control ◽  
Joint Stiffness ◽  
Joint Motion ◽  
Compliance Control ◽  
Leaf Springs ◽  
Antagonistic Actuation

Abstract In the paper, different approaches for compliance control for human oriented robots are revealed. The approaches based on the non- antagonistic and antagonistic actuation are compared. In addition, an approach is investigated in this work for the compliance and the position control in the joint by means of antagonistic actuation. It is based on the capability of the joint with torsion leaf springs to adjust its stiffness. Models of joint stiffness are presented in this paper with antagonistic and non-antagonistic influence of the spring forces on the joint motion. The stiffness and the position control possibilities are investigated and the opportunity for their decoupling as well. Some results of numerical experiments are presented in the paper too.

Innovative marine structures for better-built environment

2002 ◽  
Vol 86 (15) ◽  
pp. 1-8
Author(s):  
Paul E. Bach
Keyword(s):  
Built Environment ◽  
Marine Structures
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