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Nagarajan, Vishwanath
- Uncertainty Analysis for Ship Maneuvering in Model Scale and Full Scale Measurements
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International Journal of Innovative Research and Development, Vol 1, No 10Sp (2012), Pagination: 428-448Abstract
In this paper the uncertainty analysis (UA) of the coefficients present in 4 DoF modular maneuvering mathematical model (Hull + Propeller + Rudder) has been done by considering error in data measurement and mathematical model. Asymmetric behaviour of rudder forces of starboard and port side rudder was analyzed. All relevant maneuvering coefficients were calculated from respective PMM tests and verified with available literature. There are sources of errors in data measurement, model structure, model algorithm, etc which are still to be analyzed. The DTMB 5415 was selected because of its added complexity due to twin-propeller twin-rudder configuration.Keywords
Ship Maneuvering, Uncertainty Analysis, Roll Motion, Rudder Asymmetry- Ship Collision Risk Assessment using AIS Data
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Authors
Shwetabh Suman
,
Vishwanath Nagarajan
,
Om Prakash Sha
,
Sahbi Khanfir
,
Eiichi Kobayashi
,
Adi Maimun bin Abdul Malik
Source
International Journal of Innovative Research and Development, Vol 1, No 10Sp (2012), Pagination: 509-524Abstract
Around 90% of world trade, by volume, is facilitated by the international shipping industry. Over the past few decades seaborne trade has expanded enormously carrying large quantities of cargo including the hazardous ones. Even a single accident can cause a serious environmental disaster and loss of human lives. This has led to increased focus on analysis of ship traffic both to prevent accidents andto make informed decisions about fairway design, traffic separation schemes and disposition of emergency services. Presently, the busy waterways are the areas with high vessel traffic density and hence pose a potential threat for collisions. Therefore, the collision risk assessment is of a significance importance for ships crossing through these narrow, shallow and busy waterways. In this paper AIS data for Malacca Strait has been analysed for a period of one month to quantitatively assess the parameters of collision risk. The Malacca strait is divided into several zones and zone-wise analysis has been done to identify the most risky zones in which collision risk reduction measures can be prioritized. The collision risk parameters used here are index of speed dispersion and collision risk value. A procedure to quantitatively estimate the collision risk value for a particular zone has been described. Based on these parameters it is concluded that legs 7W, 2W, 3W & 14E are most risky zones in the strait.- Navigational Safety and Traffic Pattern Analysis Using AIS Data on the Western Coast of India
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Authors
Affiliations
1 Department of Ocean Engineering and Naval Architecture, Indian Institute of Technology Kharagpur, Kharagpur 721 302, IN
1 Department of Ocean Engineering and Naval Architecture, Indian Institute of Technology Kharagpur, Kharagpur 721 302, IN
Source
Current Science, Vol 114, No 12 (2018), Pagination: 2473-2481Abstract
Ship-borne automatic identification system (AIS) is required to be installed onboard ships as per the regulations of International Maritime Organization. The AIS data for Indian coast for three months was analysed to determine marine traffic safety, navigation pattern, etc. The entire western Indian coast was divided into 22 legs. The analysis utilized probit regression model to calculate quantitative collision risk values for identifying the risky zones in Indian coast. The methodology uses an estimate of the distance of closest point of approach and time for closest point of approach between any set of vessels in a zone to find the collision risk index.Keywords
Automatic Identification System, Collision Risk Value, DCPA and TCPA, Probit Regression Model.References
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