Conference Proceedings

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Author: search.filters.author.Nagesh, Bh.Has files: Yes

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    River trash cleaner.
    (Indian Maritime University, Visakhapatnam, 2019) Upendra, M.; Hadassah, T.; Nagesh, Bh.; Niranjan Kumar, I. N.
    With the increase in global plastic pollution in rivers/lakes which is adversely affecting the human and aquatic life. In this paper we present the design and analysis of Zero emission River Trash Cleaner (z-RTC) which is a electrically operated self-propelled floater with trash collecting arms and trash processing plant on the floater. The z-RTC collects the trash and the processing plant on the floater separates the plastic from the trash. The design and analysis of the z-RTC covers the general arrangement, stability, hydrodynamics and structural analysis. The collected plastic will be converted to lubricant oils by having an on-site pyrolysis plant. The last section of the paper discusses about the benefits and cost estimation of z-RTC.
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    Analysis and design of berthing structure for handling bulk cargo
    (Indian Maritime University, Visakhapatnam, 2019) Gaikwad, Amar G.; Patnaik, K. V. K. R. K.; Nagesh, Bh.
    This paper presents basic ideas and terminology of structural optimization of a berthing structure which was analysed and designed using different load conditions and the best possible way to construct a new berthing structure. All the suitable and useful data was adopted from the proposed site location at Belekeri port in Karnataka state and studied carefully before designing the structure. The berth is to be designed for a vessel having capacity of 120000DWT. The structure is subjected to various forces and combinations such as, High tide, Earthquake, High winds, heavy live loads as per IS: 4651-1983.The proposed berthing structure Model was generated with suitable geometry using STAAD-Pro software, after which all considerable loads on the structure were induced and analysed carefully. Different sectional dimensions were trialed during the analysis and the most acceptable structure was designed with providing all structural members with suitable reinforcement and satisfying all marine safety conditions. This research is an attempt to understand the concept of design and analysis of berthing structures under different conditions of loading.
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    Study on the failures of raw water tower structural joints when the air gap of the jack up rigs is increased
    (2019) Nagesh, Bh.; NiranjanKumar, I. N.; MadhuLatha, N.
    It is quite common to convert the existing offshore installation from one form to another mode, depending upon the next charter requirement. The Rig Owners intend to convert the age old offshore drilling rigs which are basically designed for drilling of oil and gas (called as Mobile Offshore Drilling Unit - MODU) into Mobile offshore Production Units (MOPUs). While doing so, the important element to be noticed is the air gap between the water line to the bottom of hull vis-à-vis the operating depth at site specific conditions. The air gap which normally increases compared to when the same has been used as a MODU, due to the reason that it is a fixed platform and regular jacking operations cannot be performed whereas rules call for the supporting structure to with stand the 100 years of wave and wind data in which case the wave height can be expected upto 14m and wind speeds of upto /exceeding 100 knots. As per rules the bottom of hull should be elevated to a height of at least 1.5m more than the highest wave that can occur including the surge, swell etc. In such a conversion the important parameter that is being missed out is the Raw Water Tower whose length also to be increased to meet the increased water depth and as such it will not be able to withstand the 100 years wave and wind criteria. This paper shows the study conducted on the Raw Water Tower (RWT) of a rig which is under conversion. The study is done by conducting the Global Strength Analysis. The Finite Element Method is used to determine the stresses and strains in various joint sections of the RWT by modelling the same in SACS modelling and FE analysis software which is extensively used in offshore industry. The structure is analysed as a discrete element model using beam elements. The stiffness analysis for the Raw Water Tower includes the computation of resultant stresses in members due to bending, shear, tensile & buckling stresses and checking it against the respective acceptable values.
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    Motion characteristics of a research vessel for short-term voyage
    (Indian Maritime University, Visakhapatnam, 2019) SaiKiran, Lekkalaa.; Pradhyumna, S. K.; Pavan Kumar, G. V. V.; Nagesh, Bh.
    All floating bodies are subjected to 6 degree of freedom due to various encountering forces. The design challenge lies in reducing the excessive ship behaviour and design a comfort class ships. Research vessel in specific to be design to best comfort since they can have used by non-seafarers. This paper shows the study on motion characteristics of the vessel where the real- time data measured from the newly built coastal research vessel. The data is obtained from the ships Motion Response Unit for the entire duration of the voyage which is approx. 6 hr. 30 mins. The results obtained indicate a peak roll amplitude of 12.03 Degree and average of 6.0 degree. The peakheave motion obtained 1.8m, pitch of 4.39 degree, surge of 3.9 and, sway of 7.6m.The results obtained indicate that the vessel behaved in a normal condition within the acceptable criteria in the sea state 3 which favourable for carrying out scientific activities. The dampening devices like the bilge keel, Anti-roll tank and other devices helped in improving the vessel performance.