Station-Keeping Trials in Ice: Overview of Ice Management Support

2018 ◽  
Author(s):  
Mike Neville ◽  
Erik Almkvist ◽  
Francesco Scibilia ◽  
Joakim K. Lindvall ◽  
Pavel Liferov
Keyword(s):  
Management Support ◽  
Station Keeping ◽  
Target Condition ◽  
Management Software ◽  
Sole Purpose ◽  
Planning Phase ◽  
Ice Conditions ◽  
Drifting Ice

In March 2017, Statoil performed station-keeping trials in drifting ice in the Bay of Bothnia. The anchor handling tug supply vessel Magne Viking, performed station keeping operations in various ice conditions, including managed and non-managed ice. Physical ice management was used to manage the approaching ice to a target condition suitable for the station keeping tests, and to enable other essential operations including deployment and retrieval of the mooring spread and other equipment. Given the objective of the trials, physical ice management activities were performed in such a way to allow investigation of various relevant parameters that influence the managed ice condition. Additional tests were also performed for the sole purpose to assist with validation of Aker Arctic’s ice management software “AIMS”, including tests designed to estimate the performance of the vessels under different ice conditions. This paper focuses on the physical ice management operations performed by the ice management vessel Tor Viking (TV) during the Station Keeping Trials in ice (SKT). Also included is a discussion on how AIMS was used in the planning phase and how simulations compared with actual observations.

Station-Keeping Trials in Ice: Ice and Metocean Conditions

2018 ◽  
Author(s):  
Sigurd Henrik Teigen ◽  
Joakim K. Lindvall ◽  
Ilija Samardzija ◽  
Roar I. Hansen
Keyword(s):  
Spatial Data ◽  
Ice Core ◽  
Ocean Current ◽  
Ice Thickness ◽  
Physical Parameters ◽  
Station Keeping ◽  
Sea Bed ◽  
Ice Drift ◽  
Ice Conditions ◽  
Drifting Ice

In March 2017, Statoil performed station-keeping trials in drifting ice in the Bay of Bothnia with the two anchor handling tug supply vessels Magne Viking and Tor Viking. During the trials observations of ice and metocean conditions were performed via a range of platforms and techniques. The purpose of the observations was to document the main physical parameters affecting the station-keeping vessel and ice management vessel, as well as giving tactical information on ice conditions and input to simultaneous numerical simulations. Measurements of meteorological parameters (wind speed, wind direction, air temperature, etc.) were done from the two vessels and supplemented with manual observations. Ice drift was independently measured by drifting ice trackers and ADCPs (also measuring ocean current) moored on the sea bed. Measurements of ice thickness were carried out with moored Ice Profiling Sensors (IPSs) and manual ice core samples, which were also analyzed for salinity and temperature profiles. The IPS ice thickness data was later processed together with the ice drift to provide 2D spatial data. The deepest ice ridge keels ranged from 5.4 m at the site with the most benign ice conditions to 10.9 m at the most severe site. Ridge frequency also increased from 2 ridges km−1 to 16 ridges km−1 at the most severe site (given a keel threshold of 3 m). In the present study, statistical summaries of the different time series collected at the sites of the station-keeping trials are presented, highlighting the variability in the ice conditions. Using the vessel tracks and overall drift of the broken channels, ice thickness and drift measurements are classified as being inside or outside the managed ice zone.

Station-Keeping Trials in Ice: Numerical Modelling

2018 ◽  
Author(s):  
Nicolas Serre ◽  
Sofien Kerkeni ◽  
Dmitry Sapelnikov ◽  
Cyrille Akuetevi ◽  
Sergiy Sukhorukov ◽  
...  
Keyword(s):  
Data Collection ◽  
Numerical Modelling ◽  
Numerical Simulations ◽  
Single Point ◽  
Station Keeping ◽  
Broken Ice ◽  
Ice Conditions ◽  
Drifting Ice

In March 2017, Statoil performed station-keeping trials in drifting ice in the Bay of Bothnia with two anchor handling supply vessels; Magne Viking and Tor Viking. The data collection included monitoring of ice conditions and response of Magne Viking during ice interaction events. The present paper describes numerical simulations of broken ice and intact ice interaction events with single point moored Magne Viking.

Station-Keeping Trials in Ice: Dynamic Positioning in Ice — Results and Learnings

2018 ◽  
Author(s):  
Sofien Kerkeni ◽  
Pavel Liferov ◽  
Nicolas Serré ◽  
Robert Bridges ◽  
Finn Jorgensen
Keyword(s):  
Full Scale ◽  
Control Algorithms ◽  
Dynamic Positioning ◽  
Station Keeping ◽  
Positioning Systems ◽  
Ice Conditions ◽  
Drifting Ice ◽  
External Loads

Dynamic Positioning Systems are used in numerous types of marine operations. Due to the important differences in the external loads acting on the vessel, standard DP systems may fail to perform in ice conditions. Moreover, specific principles and position keeping philosophies should be applied in ice covered waters. The objective of the paper is to elaborate on these aspects by presenting and analyzing full scale DP tests. These tests were a part of the station-keeping trials performed in March 2017 in drifting ice in the Bay of Bothnia. Control algorithms limitations of Standard DP Systems are presented, showing the necessity of new control principles. The importance of crew training is also demonstrated along with the approaches to keep position in ice.

Station-Keeping Trials in Ice: Project Overview

2018 ◽  
Author(s):  
Pavel Liferov ◽  
Thomas McKeever ◽  
Francesco Scibilia ◽  
Sigurd Henrik Teigen ◽  
Andreas Kjøl ◽  
...  
Keyword(s):  
Primary Objective ◽  
Project Planning ◽  
Maximum Amount ◽  
Full Scale ◽  
Physical Models ◽  
Station Keeping ◽  
Floating Structure ◽  
Quality Requirements ◽  
Drifting Ice ◽  
Scale Data

In March 2017, Statoil performed station-keeping trials in drifting ice in the Bay of Bothnia with two anchor handling tug supply vessels, Magne Viking and Tor Viking. The primary objective of the Station-keeping Trials in Ice project (SKT) was to gather full-scale data on a stationary floating structure in ice. The data will be used for validation of numerical and physical models, that will in turn increase confidence in modelling tools for design and operation in ice-covered waters. The principal requirement of the project was to safely collect the maximum amount of data meeting the quality requirements within the available budget and timeframe. This paper presents the overall project planning and execution, while more details are provided in the companion papers.

Jackup Designed for Optimum Operational Time in Ice Conditions

2012 ◽  
Author(s):  
Ove T. Gudmestad
Keyword(s):  
Ice Cover ◽  
The Arctic ◽  
Shallow Waters ◽  
Current Load ◽  
Fall Season ◽  
Arctic Conditions ◽  
Ice Conditions ◽  
Drifting Ice ◽  
Ice Pressure ◽  
Operational Time

There is at present a large interest in exploration for hydrocarbons in the Arctic. In shallow waters, up to, say, 70m, jackups are utilized outside the ice season, while there is a wish to extend the season when the jackups can be on site. We will report on an attempt to extend the operational season to earlier installation and later decommissioning than possible with present jackup designs for ice conditions. The installation of the jackup can take place after the ice cover has cleared sufficiently for the jackup to be maneuvered to site. It should be noted that remaining drifting ice ridges may represent a hazard as the drift of these into the jackup legs can damage the legs. The situation is particularly vulnerable when waves or strong currents cause the remaining of the ridges to impact with the jackup legs. During the operational season the jackup will operate in conventional mode. This phase should NOT been forgotten in the design as the wave and current load on the jackup might be higher than the ice pressure. Towards the end of the drilling season and prior to ice aggregation, the operator of a conventional jackup rig will become very cautious of the requirement to move the jackup out of the ice cover in due time before the sea freezes up and the jackup could get stuck in the ice cover. It should be noted that a jackup frozen into the ice cover and susceptible to loads from drifting ice sheet and ice ridges might collapse. Should the situation occur that the jackup be frozen into the ice cover, it would be necessary to call for costly ice breaker assistance to free the jackup. A jackup that could stay in the ice for a longer period in the fall season would extend the drilling season considerably. In the case such design be considered, the strength of the foundation should be checked to avoid loads that will exceed the foundation capacity of the mud mats. We will in this paper in particular discuss how we can deal with the problem of the requirement for an extended drilling season. The paper covers some of the main issues that are governing for the design of a jackup for arctic conditions. We will in particular cover the issue of leaving the offshore location safely as late as possible when ice has started to form. In this situation traditional jackups have problems and could need the very costly assistance of icebreakers. Other important issues that are not covered are the behavior of the jacket in ice. It should, however, be noted that the jackup is designed to leave the location prior to the ice situation becoming unmanageable.

Station-Keeping Trials in Ice: Marine Spread

2018 ◽  
Author(s):  
Andreas Kjøl ◽  
Pavel Liferov ◽  
Erik Almkvist ◽  
Joakim K. Lindvall ◽  
Thomas McKeever
Keyword(s):  
System Design ◽  
Station Keeping ◽  
Drifting Ice

In March 2017, Statoil performed station-keeping trials in drifting ice in the Bay of Bothnia with two anchor handling tug supply vessels. The vessels Tor Viking and Magne Viking were used as Support vessel and Moored vessel, respectively. This paper describes the above mentioned marine assets, mooring analysis, mooring configuration, mooring and unmooring procedures, including quick disconnection system design and operation.

DP Ice Model Test of Arctic Drillship and Polar Research Vessel

2012 ◽  
Author(s):  
Torbjørn Hals ◽  
Nils Albert Jenssen
Keyword(s):  
Numerical Models ◽  
Offshore Structures ◽  
Model Tests ◽  
Full Scale ◽  
The Arctic ◽  
Research Vessel ◽  
Station Keeping ◽  
Ice Drift ◽  
Ice Conditions ◽  
Ice Model

The paper presents the results from a series of ice model tests performed as part of the DYPIC (Dynamic Positioning in Ice Conditions) research program. DYPIC is a research and development project within the EU’s ERA NET MARTEC project. The major purpose of the DYPIC project is development of equipment and methods for DP Ice Model testing which allows the prediction of station keeping capability of different vessel types and offshore structures under various ice conditions. The first DYPIC model tests performed in 2011 was conducted with two significantly different vessel sizes, a 68.0000 m3 volume displacement arctic drillship and an 8.600 m3 polar research vessel. The model scale was 1/30 for the arctic drillship and 1/18.6 for the Polar Research Vessel. The model tests were performed in the ice model basin at HSVA using vessel models equipped with thruster capacity similar to full scale operation according to DP class 2 / 3 operations. The DP control system was also modified from normal open water DP operations in order to cope with the highly varying ice drift loads acting on the vessel. The test program gave data supporting the development of numerical models of ice loads from managed ice, see reference [6]. The main focus in this paper is on the station keeping performance and associated thrust utilization as a function of varying ice drift loads. The results and data collected in the first year of the DYPIC program demonstrates that DP ice model tests will be a valuable tool for evaluation of vessel performance prior to moving on to full scale arctic DP operations.

Station-Keeping Trials in Ice: Test Scenarios

2018 ◽  
Author(s):  
Pavel Liferov ◽  
Nicolas Serre ◽  
Sofien Kerkeni ◽  
Robert Bridges ◽  
Fengwei Guo
Keyword(s):  
Measurement Data ◽  
Dynamic Positioning ◽  
Station Keeping ◽  
Operational Parameters ◽  
Drifting Ice ◽  
Test Scenarios ◽  
Insight Into

Station-keeping trials were undertaken in drifting ice in the Bay of Bothnia with two anchor handling supply vessels; Magne Viking and Tor Viking. This paper describes test scenarios which were performed with Magne Viking in moored, Dynamic Positioning and transit modes. An overview of the tests performed during the trials is presented, outlining the range of environmental and operational parameters. Examples of specific ice interaction scenarios are highlighted with illustrative measurement data providing observational insight into the performance and processes.

Getting better my way: Feasibility study of a self-management support tool for people with mood and anxiety disorders.

2019 ◽  
Vol 42 (2) ◽  
pp. 158-168
Author(s):  
Janie Houle ◽  
Stephanie Radziszewski ◽  
Préscilla Labelle ◽  
Simon Coulombe ◽  
Matthew Menear ◽  
...  
Keyword(s):  
Anxiety Disorders ◽  
Feasibility Study ◽  
Self Management ◽  
Management Support ◽  
Support Tool ◽  
Mood And Anxiety Disorders

PENGELOLAAN DATA ANGGOTA BERBASIS WEBSITE DI YAMAHA VIXION CLUB CABANG BANDUNG

2020 ◽  
Vol 2 (2) ◽  
pp. 113-127
Author(s):  
Nova Indrayana Yusman
Keyword(s):  
Data Management ◽  
Organizational Structure ◽  
Human Resource Development ◽  
Human Resource ◽  
Programming Language ◽  
The Internet ◽  
Web Based ◽  
Management Software ◽  
The City ◽  
Data Management Software

Yamaha Vixion Club Bandung (YVCB) was formed on July 7, 2007 in the city of Bandung, as a place of friendship between Yamaha Vixion motorcyclists. In its organizational structure, YVCB has a Human Resource Development (HRD) division. Until now, there are more than 800 Yamaha Vixion Club Bandung members. This software is made to facilitate the work of the Yamaha Vixion Club Bandung HRD Division in processing member data. Created using Microsoft Webmatrix as an editor with the PHP programming language. The database uses MySQL with PHPMyAdmin as the software. The method used in making this software is prototyping so that between developers and customers can understand each other what the customer wants. The purpose of making web-based member data management software is that in terms of managing member data it can be done anytime and anywhere by just accessing the internet. In the use of the program, the author chose to use PHP, because PHP is the best and easiest to use in website programming language. Based on the last paragraph, the author intends to make aplication based computerized attendance so that become effective and efficient in terms of time.

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