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Seakeeping Analysis
of an Indian Research Vessel
--D Rajasekhar, U S Ramesh, G V V Pavankumar, Ananthakrishna,
P S Deepaksankar, D Narendrakumar, K Ramsundaram and N Ravi
A multidisciplinary research vessel Sagar Manjusha was considered for seakeeping analysis, which was exclusively used for deployment, maintenance and retrieval of data buoys, Tsunami buoys and so on. During rough sea conditions, the ship undergoes extreme rolling, which hinders deployment/retrieval operation. It also leads to seasickness for scientists and crew onboard. An experimental study was carried out to improve its seakeeping qualities. Ship Motion Reference Unit (MRU) data and the corresponding wave climate data were collected to study seakeeping capabilities. A model test was carried out in a towing tank facility and the design was optimized based on outcomes of test results. An Anti-Roll Tank (ART) was fabricated and installed on boat-deck. Inclination test was carried out in the presence of Indian Register of Shipping surveyor. Stability booklet was prepared as per class recommendation and the procedure was accepted by the class. It was observed during testing in rough sea condition that ship rolling had reduced by considerable amount, which in turn improved comfort and safety during extreme sea conditions. This experiment resulted in a transformation of an innovative idea into best outcome so that similar problems can be solved and the ship’s comfort, safety, productivity and so on can be improved considerably. Seakeeping analysis and installation of ART resulted in improvement in the safety of vessel, onboard machineries, instrument used for scientific research and quality of life onboard.
© 2017 IUP. All Rights Reserved.
Experimental Investigation of Thermal Performance Characteristics of Different Fluids in a Closed Loop Pulsating Heat Pipe
--Sahil Gupta and Parinam Anuradha
In the present paper, a simplified geometry of Closed Loop Pulsating Heat Pipe (CLPHP), made of Copper (Cu) tube of internal diameter 2 mm and outer diameter 4 mm having 9 number of turns charged with three different fluids, namely, methanol, acetone and ethyl acetate, is used. The various input parameters such as heating power and evaporator temperature are varied to evaluate the thermal performance in terms of thermal resistance, heat transfer rate and heat transfer coefficient and their thermodynamical properties. Acetone shows the best performance among the three fluids in heat transfer performance due to least value of dynamic viscosity. The heat transfer rate clearly shows the increase of amplitude with increase in evaporator temperature. Acetone and ethyl acetate show less start-up period due to higher value of surface tension. Due to higher value of specific heat, ethyl acetate shows high frequency and least amplitude of heat transfer rate in CLPHP. The value of latent heat of vaporization influences the timings of phenomenon of dry out and affects the heat transfer coefficient and thermal resistance.
© 2017 IUP. All Rights Reserved.
Enhancement of Microstructure
and Mechanical Properties
of Al-Alloy Materials Using Biological Quenching Medium
--M Maruthi Rao and N V V S Sudheer
Moving heat sources of laser melting are treated with various transformations along with a decoupling for the heat and mass transfer terms. The scale for heat diffusion is different from conduction, and when small intervals of time are involved in rapid solidification, the effect may be pronounced. Very little published work exists on the stability of the solid-liquid interface. It is essential to understand this aspect because instabilities in solidification processes will affect the final finish of the surface. Novel transforms specific to melting with convective surface conditions are applied to this analysis. Phase field theory notions are applied to specific cases for amorphous film formation.
© 2017 IUP. All Rights Reserved.
Optimization of Process Parameters
for CNC Turning Using Response
Surface Methodology
--Nitish Kumar, Ashwani Kumar Dhingra and Pankaj Kumar
Material removal by turning is the basic and the most important process in metal cutting. Product quality mainly depends on the process used and the parameters which affect them. The important turning parameters which affect the quality of product are cutting speed, feed rate, depth of cut, cutting tool used, cutting fluid and the material of the workpiece. The study involves the identification of the optimized process parameters in CNC turning of AISI 15b25 alloy steel. Three important parameters, namely, cutting speed, feed and depth of cut, have been considered as machining input parameters, and the output parameters to be optimized are Material Removal Rate (MRR) and surface roughness (Ra). Response Surface Methodologies (RSM) of the design e-Expert have been implemented for the optimization of process parameters. The optimal values of the surface finish and MRR are found to be 2.29 µa and 1327.93 mm3/min respectively.
© 2017 IUP. All Rights Reserved.
A Proposed Framework
for Computerized Maintenance Management System for a Power Plant
--Soumava Mandal and P C Tewari
The paper deals with a framework for Computerized Maintenance Management System (CMMS) for a power plant. The manual for maintenance of data and information becomes very difficult and tiresome and consumes time while retrieving. Using application software for this purpose leads to efficient planning and control of the maintenance aspects. The application software has been developed using Microsoft Visual Studio.NET as the front end user interface and Structured Query Language (SQL) as the back end database. The application software contains various modules such as equipment, task allotment, safety records, staff details and condition monitoring. This CMMS aims at lowering the effective downtime, frequency of failures and overall maintenance cost to improve maintenance policies and machine life.
© 2017 IUP. All Rights Reserved.
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