Conference Proceedings

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Prediction of manoeuvring behaviour of an offshore supply vessel by using simulation program
(Proceedings of MARTEC 2010 The International Conference on Marine Technology, 2010-12) Mohd Noor, Che Wan.; Muzathik, Abdul Majeed.; Wan Nik, Wan Mohd Norsani.; Ahmad, Mohammad Fadhli.; Samo, Khalid.; Balaji, Rajoo.
Manoeuvring ability of Offshore Supply Vessel (OSV) is a very critical aspect. An early prediction of vessel behaviour will definitely help to improve upon the design. The regular methods available for manoeuvring prediction such as free running model test, captive model test etc., are found to be expensive and time consuming. As an alternative, the current approach tries a numerical simulation method with parameters determined from a database. This study presents the manoeuvring prediction of an OSV which includes the development of time domain simulation program by using Matlab Simulink software. Three degrees of freedom were considered and applying the Newtonian laws, the equations of motion were framed. Further, forces on hull, forces and moments induced by propeller and rudder were also taken into reckoning. Results were obtained with inputs of vessel speeds, engine revolutions etc. Validation of the prediction results was also carried out by comparing the results with full-scale sea trial data. The prediction results show a good agreement with the sea trial data. Applying approximate numerical formula for manoeuvring prediction is seen to be a reliable and economic prediction tool at early design stages of such vessels.
Next Generation of Catalogues : Comparative study of Five Indian Universities OPACs
(Two-day National Conference on Social Media and Libraries, 2014-02) Sunil M. V.; Chandrappa
Libraries worldwide have started rethinking and reworking their catalogs in order to increase the attractiveness and efficiency of their core information product – the OPAC. The Next Generation OPAC or generally termed as OPAC 2.0 offers improved searching experiences. In this paper, the OPAC functionalities are compared across the criteria framed in line with the expectations in Next Generation OPAC in three software types – commercial, open source and free. Further, the paper attempted to address the narrow objective to understand where our Indian university OPAC stands when analyzed / evaluated against the essential criteria of a Next Generation OPAC (NGO).
Real time monitoring and controlling of marine sewage treatment plant effluent
(2022-02) Prasanna Kumar, R.; Ajantha Devi, V.
As on date around 56,000 vessels are moving in the World shipping fleet and it is growing every day. All these vessels were manned by seafarers who spend on an average of 6 months on-board. Their continuous stay onboard required the basic hotel service such as food, climate controlled Accommodation and all lavatory facilities. On top of this thousands of passenger ferries and cruise liners floating on the oceans also providing similar facilities for nature-calls of passengers. Discharge of these wastes from sewage system affects the marine environment, particularly in the confined water bodies similar to Baltic sea. One of the important requirements as per MARPOL (International conventions for the prevention of Pollution from ships,1973) by IMO is maintaining sewage treatment plant (STP) onboard[1]. This part has been specified in detail as ANNEX-IV – Prevention of Pollution by Sewage from ships[1]. Standards for Sewage treatment plant placed on-board is evaluated basis on the contents in the effluent from the plant after all processes completed. This evaluation is not performed on every STP fitted in so many numbers of vessels in service today. As a part of pre- building exercise STPs were chosen from list of type approved systems available. This type approval is issued by marine administrators by sample evaluation of one of the plant in the factory environment. This paper proposed the model STP in which the data from Real time monitoring the contents in the effluent can be used to regulate the air supplied to the plant. Different sensors such as microorganism detector, PH prob, Phosphorous sensor and Nitrogen detector of instant results types used for this purpose. To regulate the supplied air, frequency controlled motor is used in the supply–air Fan. This regulation of air will reduce the energy requirement of the overall process. Added with the regulation of air supply, real-time control on feed rate of dosing pump optimize the chemical use in the plant. Nitrogen and Phosphorus contents continues measurements and flowmeter readings from inlet and outlet of the plant ensure the effective performance of Full treatment module. This proposed model plant will be an energy efficient and real-time compliance to the international limitations stated in MARPOL.
Acoustic estimation of suspended sediment concentration from turbidity in the nearshore areas off Visakhapatnam
(INCHOE2014 (Proceedings), 2012-02-05) Patnaik, K. V. K. R. K.; Suresh, R. R. V.
Patnaik, KVKRK., Suresh, RRV., 2014. Acoustic estimation of suspended sediment concentration from turbidity in the nearshore areas off Visakhapatnam, Proceedings of the Fifth Indian National Conference on Harbour and Ocean Engineering (INCHOE2014), 5-7 Feb. 2014, CSIR-NIO, Goa, India. Accurate estimation and monitoring of suspended sediment concentration in the nearshore areas is a challenging task involved in the maintenance of draft of navigational channels, ports and harbors. In the nearshore environment Suspended Sediment Concentration varies significantly both in time and space in response to various forcing mechanisms. Though estimation of this through Acoustic remote sensing is a surrogate method, it is proved to be a best method. The present study is based on the simultaneous data obtained from 600 Khz workhorse ADCP, Turbidity sensor and LISST portable. ADCP was side mounted to BTV Sagar Manjusha at a depth region of 20m and programmed to record the data for every one minute for the period of 3 days to cover six tidal cycles. These data are used to develop a location specific version of the sonar equation which converts the ADCP echo intensity to turbidity (NTU). This equation was obtained by relating echo intensity and turbidity. It is also found that the particle size in the study area ranging from 50 – 400 μm. It is also found that the estimated turbidity is in good agreement with the measured turbidity values.

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