Passing Vessel Effect on Mooring System of a Berthed Ship—A Case Study at Jawahar Dweep Berth No: 5, Mumbai Port

2019 ◽  
pp. 217-257
Author(s):  
Keshav Sundar ◽  
V. Nandhini ◽  
S. Nallayarasu
Keyword(s):  
Mooring System ◽  
Mumbai Port

A Case Study of a Modified Gravity Type Cage and Mooring System Using Numerical and Physical Models

2005 ◽  
Vol 30 (1) ◽  
pp. 47-58 ◽  
Author(s):  
J. DeCew ◽  
D.W. Fredriksson ◽  
L. Bugrov ◽  
M.R. Swift ◽  
O. Eroshkin ◽  
...  
Keyword(s):  
Modified Gravity ◽  
Physical Models ◽  
Mooring System

A risk management approach to safe mooring systems in Australia

2016 ◽  
Vol 56 (2) ◽  
pp. 550
Author(s):  
Paul Sullivan
Keyword(s):  
Working Group ◽  
Steering Committee ◽  
Management Approach ◽  
Regulatory Regime ◽  
System Management ◽  
Mooring System ◽  
Offshore Drilling ◽  
Tropical Waters ◽  
Drilling Unit

In March 2015, during cyclone Olwyn, a mobile offshore drilling unit (MODU) experienced a mooring failure and loss of position event. The MODU was blown some three nautical miles off location in the vicinity of subsea and surface infrastructure. There are serious safety, environmental, financial, and reputational risks that can be presented by a loss of mooring position. In response, NOPSEMA hosted a workshop with members of APPEA, the International Drilling Contractors Association (IADC) and with mooring contractors with a view to collectively improve the management of risks associated with the mooring of MODUs in Australia’s tropical waters, both in the short and longer term. Following this workshop, NOPSEMA issued an Information Note for the 2015/16 cyclone season, describing the regulators’ expectations of industry duty holders in respect of MODU mooring system management. At the same time, APPEA’s Drilling Industry Steering Committee (DISC) members aligned on the key principles underpinning a MODU mooring system approach. In late 2015, the APPEA DISC members commissioned a working group to develop a guidance framework for MODU mooring management in Australian tropical waters. DISC aims to work closely with industry partners such as IADC and specialist mooring contractors in the development of this framework. DISC has tasked the working group to have the guidance framework ready for the 2016/17 cyclone season, and for presentation at the 2016 APPEA Conference. The completed case study, presented at the APPEA Conference, provides an excellent example of a goal-setting and continuous improvement regulatory regime working as designed and intended.

Mooring Pattern Optimization Using A Genetic Algorithm

2014 ◽  
Vol 66 (2) ◽  
Author(s):  
Mahdi Mirzaei ◽  
Maimun, A. ◽  
Priyanto, A. ◽  
Fitriadhy, A.
Keyword(s):  
Genetic Algorithm ◽  
System Analysis ◽  
Mathematical Formulation ◽  
System Optimization ◽  
Automatic Process ◽  
Mooring System ◽  
Proper Formulation ◽  
Dynamic Analyses ◽  
Optimum Solution

In this paper, a constraint Genetic Algorithm is used for the purpose of mooring pattern optimization. The Genetic Algorithm is applied through a mathematical formulation which is introduced to define a typical mooring system optimization problem. The mathematical formulation is used in a case study on a spread moored crane barge, operating in the vicinity of a jacket type platform, in order to minimize its surge motions towards the platform. For this purpose, a set of criteria regarding clearances between anchors and seabed preinstalled facilities (pipelines), and also between the crane barge and the jacket platform are presented and considered. An automatic process of repetitive analyses implementing a MATLAB code as an interface between the Genetic Algorithm and a mooring system analysis program is used, and an optimum solution is resulted by performing 4000 quasi-dynamic analyses in time domain. The effectiveness of the Genetic Algorithm in leading to an optimum mooring system pattern is studied and it is shown that using a proper formulation of the problem, the Genetic Algorithm can be a very useful tool for finding an optimum pattern for mooring systems in fields with constraints on anchor locations and vessel motions.

Enhancement of Design Criteria for Fish Farm Facilities Including Operations

2005 ◽  
Author(s):  
Are Johan Berstad ◽  
Harald Tronstad ◽  
Stein-Arne Sivertsen ◽  
Endre Leite
Keyword(s):  
Research Work ◽  
Fish Farming ◽  
Fish Farm ◽  
Design Criteria ◽  
Mooring System ◽  
Fish Farms ◽  
Safety Level ◽  
Operational Conditions ◽  
Farming Industry

A Norwegian Standard NS 9415 (NAS, 2003) has been introduced to the offshore fish farming industry in Norway. This is the first standard dealing with offshore fish farm facilities. The main objective of the standard is to reduce environmental pollution by fish escape. The work process leading to NS 9415 revealed the need for research work in several areas to enhance design criteria with the objective of having a consistent safety level through out the life cycle of a fish farm facility. This paper presents results from a government supported research project with the objective of enhancing criteria for design and operation of fish farm facilities. A case study of a fish farm facility representative for the majority of polyethylene based fish farms in Norway is presented and the sensitivity of such fish farms to variation in the mooring system is shown and discussed for design relevance. The sensitivity of net cage volume to current and weights is presented and discussed. Possible hazards from operational conditions are listed.

scholarly journals Chlorine leak on Mumbai port trust′s Sewri yard: A case study

2010 ◽  
Vol 2 (3) ◽  
pp. 161 ◽  
Author(s):  
RakeshKumar Sharma ◽  
Raman Chawla ◽  
Surendra Kumar
Keyword(s):  
Mumbai Port

Mooring System Stiffness: A General Analytical Formulation With an Application to Floating Offshore Wind Turbines

2018 ◽  
Author(s):  
Celso P. Pesce ◽  
Giovanni A. Amaral ◽  
Guilherme R. Franzini
Keyword(s):  
Offshore Wind ◽  
Mooring Line ◽  
Analytical Mechanics ◽  
Mooring System ◽  
Analytical Formulation ◽  
Offshore Wind Turbines ◽  
Floating Offshore Wind Turbines ◽  
The Mean ◽  
System Layout

Using classic approaches of analytical mechanics, this paper addresses the general problem and provides an analytic and explicit formulation for the stiffness matrix of a generic mooring system layout. This is done around a generic offset position and heading of the floating unit, given the curves of tension vs displacement for each mooring line, for a frictionless seabed. The international benchmark of the Offshore Code Comparison Collaboration Continuation – OC4 is taken as a case study. The use of the analytical formulation is exemplified by systematically varying the mean offset position and heading of the platform, as well as the pretensioning of the mooring system.

The Genesis and Internal Dynamics of El Salvador's People's Revolutionary Army, 1970–1976

2014 ◽  
Vol 38 (01) ◽  
pp. 102-129
Author(s):  
ALBERTO MARTÍN ÁLVAREZ ◽  
EUDALD CORTINA ORERO
Keyword(s):  
Latin America ◽  
El Salvador ◽  
Early Years ◽  
Left Wing ◽  
Internal Dynamics ◽  
Internal Coherence ◽  
The 1960S

AbstractUsing interviews with former militants and previously unpublished documents, this article traces the genesis and internal dynamics of the Ejército Revolucionario del Pueblo (People's Revolutionary Army, ERP) in El Salvador during the early years of its existence (1970–6). This period was marked by the inability of the ERP to maintain internal coherence or any consensus on revolutionary strategy, which led to a series of splits and internal fights over control of the organisation. The evidence marshalled in this case study sheds new light on the origins of the armed Salvadorean Left and thus contributes to a wider understanding of the processes of formation and internal dynamics of armed left-wing groups that emerged from the 1960s onwards in Latin America.

Culture and the plasticity of perception

2020 ◽  
Vol 43 ◽  
Author(s):  
Michael Lifshitz ◽  
T. M. Luhrmann
Keyword(s):  
Cultural Context ◽  
Sensory Experience ◽  
Cultural Learning ◽  
The World

Abstract Culture shapes our basic sensory experience of the world. This is particularly striking in the study of religion and psychosis, where we and others have shown that cultural context determines both the structure and content of hallucination-like events. The cultural shaping of hallucinations may provide a rich case-study for linking cultural learning with emerging prediction-based models of perception.

Dual systems for all: Higher-order, role-based relational reasoning as a uniquely derived feature of human cognition

2019 ◽  
Vol 42 ◽  
Author(s):  
Daniel J. Povinelli ◽  
Gabrielle C. Glorioso ◽  
Shannon L. Kuznar ◽  
Mateja Pavlic
Keyword(s):  
Temporal Reasoning ◽  
Higher Order ◽  
Important Case ◽  
Human Cognition ◽  
Relational Reasoning ◽  
Dual Systems ◽  
First Order ◽  
Reasoning System ◽  
Role Based

Abstract Hoerl and McCormack demonstrate that although animals possess a sophisticated temporal updating system, there is no evidence that they also possess a temporal reasoning system. This important case study is directly related to the broader claim that although animals are manifestly capable of first-order (perceptually-based) relational reasoning, they lack the capacity for higher-order, role-based relational reasoning. We argue this distinction applies to all domains of cognition.

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